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linux/drivers/input/misc/iqs7222.c
Rob Herring dbce1a7d5d Input: Explicitly include correct DT includes 
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230714174633.4058096-1-robh@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2023-07-17 10:03:07 -07:00

3052 lines
73 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Azoteq IQS7222A/B/C/D Capacitive Touch Controller
*
* Copyright (C) 2022 Jeff LaBundy <jeff@labundy.com>
*/
#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#define IQS7222_PROD_NUM 0x00
#define IQS7222_PROD_NUM_A 840
#define IQS7222_PROD_NUM_B 698
#define IQS7222_PROD_NUM_C 863
#define IQS7222_PROD_NUM_D 1046
#define IQS7222_SYS_STATUS 0x10
#define IQS7222_SYS_STATUS_RESET BIT(3)
#define IQS7222_SYS_STATUS_ATI_ERROR BIT(1)
#define IQS7222_SYS_STATUS_ATI_ACTIVE BIT(0)
#define IQS7222_CHAN_SETUP_0_REF_MODE_MASK GENMASK(15, 14)
#define IQS7222_CHAN_SETUP_0_REF_MODE_FOLLOW BIT(15)
#define IQS7222_CHAN_SETUP_0_REF_MODE_REF BIT(14)
#define IQS7222_CHAN_SETUP_0_CHAN_EN BIT(8)
#define IQS7222_SLDR_SETUP_0_CHAN_CNT_MASK GENMASK(2, 0)
#define IQS7222_SLDR_SETUP_2_RES_MASK GENMASK(15, 8)
#define IQS7222_SLDR_SETUP_2_RES_SHIFT 8
#define IQS7222_SLDR_SETUP_2_TOP_SPEED_MASK GENMASK(7, 0)
#define IQS7222_GPIO_SETUP_0_GPIO_EN BIT(0)
#define IQS7222_SYS_SETUP 0xD0
#define IQS7222_SYS_SETUP_INTF_MODE_MASK GENMASK(7, 6)
#define IQS7222_SYS_SETUP_INTF_MODE_TOUCH BIT(7)
#define IQS7222_SYS_SETUP_INTF_MODE_EVENT BIT(6)
#define IQS7222_SYS_SETUP_PWR_MODE_MASK GENMASK(5, 4)
#define IQS7222_SYS_SETUP_PWR_MODE_AUTO IQS7222_SYS_SETUP_PWR_MODE_MASK
#define IQS7222_SYS_SETUP_REDO_ATI BIT(2)
#define IQS7222_SYS_SETUP_ACK_RESET BIT(0)
#define IQS7222_EVENT_MASK_ATI BIT(12)
#define IQS7222_EVENT_MASK_SLDR BIT(10)
#define IQS7222_EVENT_MASK_TPAD IQS7222_EVENT_MASK_SLDR
#define IQS7222_EVENT_MASK_TOUCH BIT(1)
#define IQS7222_EVENT_MASK_PROX BIT(0)
#define IQS7222_COMMS_HOLD BIT(0)
#define IQS7222_COMMS_ERROR 0xEEEE
#define IQS7222_COMMS_RETRY_MS 50
#define IQS7222_COMMS_TIMEOUT_MS 100
#define IQS7222_RESET_TIMEOUT_MS 250
#define IQS7222_ATI_TIMEOUT_MS 2000
#define IQS7222_MAX_COLS_STAT 8
#define IQS7222_MAX_COLS_CYCLE 3
#define IQS7222_MAX_COLS_GLBL 3
#define IQS7222_MAX_COLS_BTN 3
#define IQS7222_MAX_COLS_CHAN 6
#define IQS7222_MAX_COLS_FILT 2
#define IQS7222_MAX_COLS_SLDR 11
#define IQS7222_MAX_COLS_TPAD 24
#define IQS7222_MAX_COLS_GPIO 3
#define IQS7222_MAX_COLS_SYS 13
#define IQS7222_MAX_CHAN 20
#define IQS7222_MAX_SLDR 2
#define IQS7222_NUM_RETRIES 5
#define IQS7222_REG_OFFSET 0x100
enum iqs7222_reg_key_id {
IQS7222_REG_KEY_NONE,
IQS7222_REG_KEY_PROX,
IQS7222_REG_KEY_TOUCH,
IQS7222_REG_KEY_DEBOUNCE,
IQS7222_REG_KEY_TAP,
IQS7222_REG_KEY_TAP_LEGACY,
IQS7222_REG_KEY_AXIAL,
IQS7222_REG_KEY_AXIAL_LEGACY,
IQS7222_REG_KEY_WHEEL,
IQS7222_REG_KEY_NO_WHEEL,
IQS7222_REG_KEY_RESERVED
};
enum iqs7222_reg_grp_id {
IQS7222_REG_GRP_STAT,
IQS7222_REG_GRP_FILT,
IQS7222_REG_GRP_CYCLE,
IQS7222_REG_GRP_GLBL,
IQS7222_REG_GRP_BTN,
IQS7222_REG_GRP_CHAN,
IQS7222_REG_GRP_SLDR,
IQS7222_REG_GRP_TPAD,
IQS7222_REG_GRP_GPIO,
IQS7222_REG_GRP_SYS,
IQS7222_NUM_REG_GRPS
};
static const char * const iqs7222_reg_grp_names[IQS7222_NUM_REG_GRPS] = {
[IQS7222_REG_GRP_CYCLE] = "cycle-%d",
[IQS7222_REG_GRP_CHAN] = "channel-%d",
[IQS7222_REG_GRP_SLDR] = "slider-%d",
[IQS7222_REG_GRP_TPAD] = "trackpad",
[IQS7222_REG_GRP_GPIO] = "gpio-%d",
};
static const unsigned int iqs7222_max_cols[IQS7222_NUM_REG_GRPS] = {
[IQS7222_REG_GRP_STAT] = IQS7222_MAX_COLS_STAT,
[IQS7222_REG_GRP_CYCLE] = IQS7222_MAX_COLS_CYCLE,
[IQS7222_REG_GRP_GLBL] = IQS7222_MAX_COLS_GLBL,
[IQS7222_REG_GRP_BTN] = IQS7222_MAX_COLS_BTN,
[IQS7222_REG_GRP_CHAN] = IQS7222_MAX_COLS_CHAN,
[IQS7222_REG_GRP_FILT] = IQS7222_MAX_COLS_FILT,
[IQS7222_REG_GRP_SLDR] = IQS7222_MAX_COLS_SLDR,
[IQS7222_REG_GRP_TPAD] = IQS7222_MAX_COLS_TPAD,
[IQS7222_REG_GRP_GPIO] = IQS7222_MAX_COLS_GPIO,
[IQS7222_REG_GRP_SYS] = IQS7222_MAX_COLS_SYS,
};
static const unsigned int iqs7222_gpio_links[] = { 2, 5, 6, };
struct iqs7222_event_desc {
const char *name;
u16 link;
u16 mask;
u16 val;
u16 strict;
u16 enable;
enum iqs7222_reg_key_id reg_key;
};
static const struct iqs7222_event_desc iqs7222_kp_events[] = {
{
.name = "event-prox",
.enable = IQS7222_EVENT_MASK_PROX,
.reg_key = IQS7222_REG_KEY_PROX,
},
{
.name = "event-touch",
.enable = IQS7222_EVENT_MASK_TOUCH,
.reg_key = IQS7222_REG_KEY_TOUCH,
},
};
static const struct iqs7222_event_desc iqs7222_sl_events[] = {
{ .name = "event-press", },
{
.name = "event-tap",
.mask = BIT(0),
.val = BIT(0),
.enable = BIT(0),
.reg_key = IQS7222_REG_KEY_TAP,
},
{
.name = "event-swipe-pos",
.mask = BIT(5) | BIT(1),
.val = BIT(1),
.enable = BIT(1),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-swipe-neg",
.mask = BIT(5) | BIT(1),
.val = BIT(5) | BIT(1),
.enable = BIT(1),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-flick-pos",
.mask = BIT(5) | BIT(2),
.val = BIT(2),
.enable = BIT(2),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-flick-neg",
.mask = BIT(5) | BIT(2),
.val = BIT(5) | BIT(2),
.enable = BIT(2),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
};
static const struct iqs7222_event_desc iqs7222_tp_events[] = {
{
.name = "event-press",
.link = BIT(7),
},
{
.name = "event-tap",
.link = BIT(0),
.mask = BIT(0),
.val = BIT(0),
.enable = BIT(0),
.reg_key = IQS7222_REG_KEY_TAP,
},
{
.name = "event-swipe-x-pos",
.link = BIT(2),
.mask = BIT(2) | BIT(1),
.val = BIT(2),
.strict = BIT(4),
.enable = BIT(1),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-swipe-y-pos",
.link = BIT(3),
.mask = BIT(3) | BIT(1),
.val = BIT(3),
.strict = BIT(3),
.enable = BIT(1),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-swipe-x-neg",
.link = BIT(4),
.mask = BIT(4) | BIT(1),
.val = BIT(4),
.strict = BIT(4),
.enable = BIT(1),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-swipe-y-neg",
.link = BIT(5),
.mask = BIT(5) | BIT(1),
.val = BIT(5),
.strict = BIT(3),
.enable = BIT(1),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-flick-x-pos",
.link = BIT(2),
.mask = BIT(2) | BIT(1),
.val = BIT(2) | BIT(1),
.strict = BIT(4),
.enable = BIT(2),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-flick-y-pos",
.link = BIT(3),
.mask = BIT(3) | BIT(1),
.val = BIT(3) | BIT(1),
.strict = BIT(3),
.enable = BIT(2),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-flick-x-neg",
.link = BIT(4),
.mask = BIT(4) | BIT(1),
.val = BIT(4) | BIT(1),
.strict = BIT(4),
.enable = BIT(2),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
{
.name = "event-flick-y-neg",
.link = BIT(5),
.mask = BIT(5) | BIT(1),
.val = BIT(5) | BIT(1),
.strict = BIT(3),
.enable = BIT(2),
.reg_key = IQS7222_REG_KEY_AXIAL,
},
};
struct iqs7222_reg_grp_desc {
u16 base;
int num_row;
int num_col;
};
struct iqs7222_dev_desc {
u16 prod_num;
u16 fw_major;
u16 fw_minor;
u16 sldr_res;
u16 touch_link;
u16 wheel_enable;
int allow_offset;
int event_offset;
int comms_offset;
bool legacy_gesture;
struct iqs7222_reg_grp_desc reg_grps[IQS7222_NUM_REG_GRPS];
};
static const struct iqs7222_dev_desc iqs7222_devs[] = {
{
.prod_num = IQS7222_PROD_NUM_A,
.fw_major = 1,
.fw_minor = 13,
.sldr_res = U8_MAX * 16,
.touch_link = 1768,
.allow_offset = 9,
.event_offset = 10,
.comms_offset = 12,
.reg_grps = {
[IQS7222_REG_GRP_STAT] = {
.base = IQS7222_SYS_STATUS,
.num_row = 1,
.num_col = 8,
},
[IQS7222_REG_GRP_CYCLE] = {
.base = 0x8000,
.num_row = 7,
.num_col = 3,
},
[IQS7222_REG_GRP_GLBL] = {
.base = 0x8700,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_BTN] = {
.base = 0x9000,
.num_row = 12,
.num_col = 3,
},
[IQS7222_REG_GRP_CHAN] = {
.base = 0xA000,
.num_row = 12,
.num_col = 6,
},
[IQS7222_REG_GRP_FILT] = {
.base = 0xAC00,
.num_row = 1,
.num_col = 2,
},
[IQS7222_REG_GRP_SLDR] = {
.base = 0xB000,
.num_row = 2,
.num_col = 11,
},
[IQS7222_REG_GRP_GPIO] = {
.base = 0xC000,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_SYS] = {
.base = IQS7222_SYS_SETUP,
.num_row = 1,
.num_col = 13,
},
},
},
{
.prod_num = IQS7222_PROD_NUM_A,
.fw_major = 1,
.fw_minor = 12,
.sldr_res = U8_MAX * 16,
.touch_link = 1768,
.allow_offset = 9,
.event_offset = 10,
.comms_offset = 12,
.legacy_gesture = true,
.reg_grps = {
[IQS7222_REG_GRP_STAT] = {
.base = IQS7222_SYS_STATUS,
.num_row = 1,
.num_col = 8,
},
[IQS7222_REG_GRP_CYCLE] = {
.base = 0x8000,
.num_row = 7,
.num_col = 3,
},
[IQS7222_REG_GRP_GLBL] = {
.base = 0x8700,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_BTN] = {
.base = 0x9000,
.num_row = 12,
.num_col = 3,
},
[IQS7222_REG_GRP_CHAN] = {
.base = 0xA000,
.num_row = 12,
.num_col = 6,
},
[IQS7222_REG_GRP_FILT] = {
.base = 0xAC00,
.num_row = 1,
.num_col = 2,
},
[IQS7222_REG_GRP_SLDR] = {
.base = 0xB000,
.num_row = 2,
.num_col = 11,
},
[IQS7222_REG_GRP_GPIO] = {
.base = 0xC000,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_SYS] = {
.base = IQS7222_SYS_SETUP,
.num_row = 1,
.num_col = 13,
},
},
},
{
.prod_num = IQS7222_PROD_NUM_B,
.fw_major = 1,
.fw_minor = 43,
.event_offset = 10,
.comms_offset = 11,
.reg_grps = {
[IQS7222_REG_GRP_STAT] = {
.base = IQS7222_SYS_STATUS,
.num_row = 1,
.num_col = 6,
},
[IQS7222_REG_GRP_CYCLE] = {
.base = 0x8000,
.num_row = 10,
.num_col = 2,
},
[IQS7222_REG_GRP_GLBL] = {
.base = 0x8A00,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_BTN] = {
.base = 0x9000,
.num_row = 20,
.num_col = 2,
},
[IQS7222_REG_GRP_CHAN] = {
.base = 0xB000,
.num_row = 20,
.num_col = 4,
},
[IQS7222_REG_GRP_FILT] = {
.base = 0xC400,
.num_row = 1,
.num_col = 2,
},
[IQS7222_REG_GRP_SYS] = {
.base = IQS7222_SYS_SETUP,
.num_row = 1,
.num_col = 13,
},
},
},
{
.prod_num = IQS7222_PROD_NUM_B,
.fw_major = 1,
.fw_minor = 27,
.reg_grps = {
[IQS7222_REG_GRP_STAT] = {
.base = IQS7222_SYS_STATUS,
.num_row = 1,
.num_col = 6,
},
[IQS7222_REG_GRP_CYCLE] = {
.base = 0x8000,
.num_row = 10,
.num_col = 2,
},
[IQS7222_REG_GRP_GLBL] = {
.base = 0x8A00,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_BTN] = {
.base = 0x9000,
.num_row = 20,
.num_col = 2,
},
[IQS7222_REG_GRP_CHAN] = {
.base = 0xB000,
.num_row = 20,
.num_col = 4,
},
[IQS7222_REG_GRP_FILT] = {
.base = 0xC400,
.num_row = 1,
.num_col = 2,
},
[IQS7222_REG_GRP_SYS] = {
.base = IQS7222_SYS_SETUP,
.num_row = 1,
.num_col = 10,
},
},
},
{
.prod_num = IQS7222_PROD_NUM_C,
.fw_major = 2,
.fw_minor = 6,
.sldr_res = U16_MAX,
.touch_link = 1686,
.wheel_enable = BIT(3),
.event_offset = 9,
.comms_offset = 10,
.reg_grps = {
[IQS7222_REG_GRP_STAT] = {
.base = IQS7222_SYS_STATUS,
.num_row = 1,
.num_col = 6,
},
[IQS7222_REG_GRP_CYCLE] = {
.base = 0x8000,
.num_row = 5,
.num_col = 3,
},
[IQS7222_REG_GRP_GLBL] = {
.base = 0x8500,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_BTN] = {
.base = 0x9000,
.num_row = 10,
.num_col = 3,
},
[IQS7222_REG_GRP_CHAN] = {
.base = 0xA000,
.num_row = 10,
.num_col = 6,
},
[IQS7222_REG_GRP_FILT] = {
.base = 0xAA00,
.num_row = 1,
.num_col = 2,
},
[IQS7222_REG_GRP_SLDR] = {
.base = 0xB000,
.num_row = 2,
.num_col = 10,
},
[IQS7222_REG_GRP_GPIO] = {
.base = 0xC000,
.num_row = 3,
.num_col = 3,
},
[IQS7222_REG_GRP_SYS] = {
.base = IQS7222_SYS_SETUP,
.num_row = 1,
.num_col = 12,
},
},
},
{
.prod_num = IQS7222_PROD_NUM_C,
.fw_major = 1,
.fw_minor = 13,
.sldr_res = U16_MAX,
.touch_link = 1674,
.wheel_enable = BIT(3),
.event_offset = 9,
.comms_offset = 10,
.reg_grps = {
[IQS7222_REG_GRP_STAT] = {
.base = IQS7222_SYS_STATUS,
.num_row = 1,
.num_col = 6,
},
[IQS7222_REG_GRP_CYCLE] = {
.base = 0x8000,
.num_row = 5,
.num_col = 3,
},
[IQS7222_REG_GRP_GLBL] = {
.base = 0x8500,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_BTN] = {
.base = 0x9000,
.num_row = 10,
.num_col = 3,
},
[IQS7222_REG_GRP_CHAN] = {
.base = 0xA000,
.num_row = 10,
.num_col = 6,
},
[IQS7222_REG_GRP_FILT] = {
.base = 0xAA00,
.num_row = 1,
.num_col = 2,
},
[IQS7222_REG_GRP_SLDR] = {
.base = 0xB000,
.num_row = 2,
.num_col = 10,
},
[IQS7222_REG_GRP_GPIO] = {
.base = 0xC000,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_SYS] = {
.base = IQS7222_SYS_SETUP,
.num_row = 1,
.num_col = 11,
},
},
},
{
.prod_num = IQS7222_PROD_NUM_D,
.fw_major = 0,
.fw_minor = 37,
.touch_link = 1770,
.allow_offset = 9,
.event_offset = 10,
.comms_offset = 11,
.reg_grps = {
[IQS7222_REG_GRP_STAT] = {
.base = IQS7222_SYS_STATUS,
.num_row = 1,
.num_col = 7,
},
[IQS7222_REG_GRP_CYCLE] = {
.base = 0x8000,
.num_row = 7,
.num_col = 2,
},
[IQS7222_REG_GRP_GLBL] = {
.base = 0x8700,
.num_row = 1,
.num_col = 3,
},
[IQS7222_REG_GRP_BTN] = {
.base = 0x9000,
.num_row = 14,
.num_col = 3,
},
[IQS7222_REG_GRP_CHAN] = {
.base = 0xA000,
.num_row = 14,
.num_col = 4,
},
[IQS7222_REG_GRP_FILT] = {
.base = 0xAE00,
.num_row = 1,
.num_col = 2,
},
[IQS7222_REG_GRP_TPAD] = {
.base = 0xB000,
.num_row = 1,
.num_col = 24,
},
[IQS7222_REG_GRP_GPIO] = {
.base = 0xC000,
.num_row = 3,
.num_col = 3,
},
[IQS7222_REG_GRP_SYS] = {
.base = IQS7222_SYS_SETUP,
.num_row = 1,
.num_col = 12,
},
},
},
};
struct iqs7222_prop_desc {
const char *name;
enum iqs7222_reg_grp_id reg_grp;
enum iqs7222_reg_key_id reg_key;
int reg_offset;
int reg_shift;
int reg_width;
int val_pitch;
int val_min;
int val_max;
bool invert;
const char *label;
};
static const struct iqs7222_prop_desc iqs7222_props[] = {
{
.name = "azoteq,conv-period",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 0,
.reg_shift = 8,
.reg_width = 8,
.label = "conversion period",
},
{
.name = "azoteq,conv-frac",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 0,
.reg_shift = 0,
.reg_width = 8,
.label = "conversion frequency fractional divider",
},
{
.name = "azoteq,rx-float-inactive",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 1,
.reg_shift = 6,
.reg_width = 1,
.invert = true,
},
{
.name = "azoteq,dead-time-enable",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 1,
.reg_shift = 5,
.reg_width = 1,
},
{
.name = "azoteq,tx-freq-fosc",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 1,
.reg_shift = 4,
.reg_width = 1,
},
{
.name = "azoteq,vbias-enable",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 1,
.reg_shift = 3,
.reg_width = 1,
},
{
.name = "azoteq,sense-mode",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 1,
.reg_shift = 0,
.reg_width = 3,
.val_max = 3,
.label = "sensing mode",
},
{
.name = "azoteq,iref-enable",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 2,
.reg_shift = 10,
.reg_width = 1,
},
{
.name = "azoteq,iref-level",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 2,
.reg_shift = 4,
.reg_width = 4,
.label = "current reference level",
},
{
.name = "azoteq,iref-trim",
.reg_grp = IQS7222_REG_GRP_CYCLE,
.reg_offset = 2,
.reg_shift = 0,
.reg_width = 4,
.label = "current reference trim",
},
{
.name = "azoteq,max-counts",
.reg_grp = IQS7222_REG_GRP_GLBL,
.reg_offset = 0,
.reg_shift = 13,
.reg_width = 2,
.label = "maximum counts",
},
{
.name = "azoteq,auto-mode",
.reg_grp = IQS7222_REG_GRP_GLBL,
.reg_offset = 0,
.reg_shift = 2,
.reg_width = 2,
.label = "number of conversions",
},
{
.name = "azoteq,ati-frac-div-fine",
.reg_grp = IQS7222_REG_GRP_GLBL,
.reg_offset = 1,
.reg_shift = 9,
.reg_width = 5,
.label = "ATI fine fractional divider",
},
{
.name = "azoteq,ati-frac-div-coarse",
.reg_grp = IQS7222_REG_GRP_GLBL,
.reg_offset = 1,
.reg_shift = 0,
.reg_width = 5,
.label = "ATI coarse fractional divider",
},
{
.name = "azoteq,ati-comp-select",
.reg_grp = IQS7222_REG_GRP_GLBL,
.reg_offset = 2,
.reg_shift = 0,
.reg_width = 10,
.label = "ATI compensation selection",
},
{
.name = "azoteq,ati-band",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 0,
.reg_shift = 12,
.reg_width = 2,
.label = "ATI band",
},
{
.name = "azoteq,global-halt",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 0,
.reg_shift = 11,
.reg_width = 1,
},
{
.name = "azoteq,invert-enable",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 0,
.reg_shift = 10,
.reg_width = 1,
},
{
.name = "azoteq,dual-direction",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 0,
.reg_shift = 9,
.reg_width = 1,
},
{
.name = "azoteq,samp-cap-double",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 0,
.reg_shift = 3,
.reg_width = 1,
},
{
.name = "azoteq,vref-half",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 0,
.reg_shift = 2,
.reg_width = 1,
},
{
.name = "azoteq,proj-bias",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 0,
.reg_shift = 0,
.reg_width = 2,
.label = "projected bias current",
},
{
.name = "azoteq,ati-target",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 1,
.reg_shift = 8,
.reg_width = 8,
.val_pitch = 8,
.label = "ATI target",
},
{
.name = "azoteq,ati-base",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 1,
.reg_shift = 3,
.reg_width = 5,
.val_pitch = 16,
.label = "ATI base",
},
{
.name = "azoteq,ati-mode",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 1,
.reg_shift = 0,
.reg_width = 3,
.val_max = 5,
.label = "ATI mode",
},
{
.name = "azoteq,ati-frac-div-fine",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 2,
.reg_shift = 9,
.reg_width = 5,
.label = "ATI fine fractional divider",
},
{
.name = "azoteq,ati-frac-mult-coarse",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 2,
.reg_shift = 5,
.reg_width = 4,
.label = "ATI coarse fractional multiplier",
},
{
.name = "azoteq,ati-frac-div-coarse",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 2,
.reg_shift = 0,
.reg_width = 5,
.label = "ATI coarse fractional divider",
},
{
.name = "azoteq,ati-comp-div",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 3,
.reg_shift = 11,
.reg_width = 5,
.label = "ATI compensation divider",
},
{
.name = "azoteq,ati-comp-select",
.reg_grp = IQS7222_REG_GRP_CHAN,
.reg_offset = 3,
.reg_shift = 0,
.reg_width = 10,
.label = "ATI compensation selection",
},
{
.name = "azoteq,debounce-exit",
.reg_grp = IQS7222_REG_GRP_BTN,
.reg_key = IQS7222_REG_KEY_DEBOUNCE,
.reg_offset = 0,
.reg_shift = 12,
.reg_width = 4,
.label = "debounce exit factor",
},
{
.name = "azoteq,debounce-enter",
.reg_grp = IQS7222_REG_GRP_BTN,
.reg_key = IQS7222_REG_KEY_DEBOUNCE,
.reg_offset = 0,
.reg_shift = 8,
.reg_width = 4,
.label = "debounce entrance factor",
},
{
.name = "azoteq,thresh",
.reg_grp = IQS7222_REG_GRP_BTN,
.reg_key = IQS7222_REG_KEY_PROX,
.reg_offset = 0,
.reg_shift = 0,
.reg_width = 8,
.val_max = 127,
.label = "threshold",
},
{
.name = "azoteq,thresh",
.reg_grp = IQS7222_REG_GRP_BTN,
.reg_key = IQS7222_REG_KEY_TOUCH,
.reg_offset = 1,
.reg_shift = 0,
.reg_width = 8,
.label = "threshold",
},
{
.name = "azoteq,hyst",
.reg_grp = IQS7222_REG_GRP_BTN,
.reg_key = IQS7222_REG_KEY_TOUCH,
.reg_offset = 1,
.reg_shift = 8,
.reg_width = 8,
.label = "hysteresis",
},
{
.name = "azoteq,lta-beta-lp",
.reg_grp = IQS7222_REG_GRP_FILT,
.reg_offset = 0,
.reg_shift = 12,
.reg_width = 4,
.label = "low-power mode long-term average beta",
},
{
.name = "azoteq,lta-beta-np",
.reg_grp = IQS7222_REG_GRP_FILT,
.reg_offset = 0,
.reg_shift = 8,
.reg_width = 4,
.label = "normal-power mode long-term average beta",
},
{
.name = "azoteq,counts-beta-lp",
.reg_grp = IQS7222_REG_GRP_FILT,
.reg_offset = 0,
.reg_shift = 4,
.reg_width = 4,
.label = "low-power mode counts beta",
},
{
.name = "azoteq,counts-beta-np",
.reg_grp = IQS7222_REG_GRP_FILT,
.reg_offset = 0,
.reg_shift = 0,
.reg_width = 4,
.label = "normal-power mode counts beta",
},
{
.name = "azoteq,lta-fast-beta-lp",
.reg_grp = IQS7222_REG_GRP_FILT,
.reg_offset = 1,
.reg_shift = 4,
.reg_width = 4,
.label = "low-power mode long-term average fast beta",
},
{
.name = "azoteq,lta-fast-beta-np",
.reg_grp = IQS7222_REG_GRP_FILT,
.reg_offset = 1,
.reg_shift = 0,
.reg_width = 4,
.label = "normal-power mode long-term average fast beta",
},
{
.name = "azoteq,lower-cal",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_offset = 0,
.reg_shift = 8,
.reg_width = 8,
.label = "lower calibration",
},
{
.name = "azoteq,static-beta",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_NO_WHEEL,
.reg_offset = 0,
.reg_shift = 6,
.reg_width = 1,
},
{
.name = "azoteq,bottom-beta",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_NO_WHEEL,
.reg_offset = 0,
.reg_shift = 3,
.reg_width = 3,
.label = "bottom beta",
},
{
.name = "azoteq,static-beta",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_WHEEL,
.reg_offset = 0,
.reg_shift = 7,
.reg_width = 1,
},
{
.name = "azoteq,bottom-beta",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_WHEEL,
.reg_offset = 0,
.reg_shift = 4,
.reg_width = 3,
.label = "bottom beta",
},
{
.name = "azoteq,bottom-speed",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_offset = 1,
.reg_shift = 8,
.reg_width = 8,
.label = "bottom speed",
},
{
.name = "azoteq,upper-cal",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_offset = 1,
.reg_shift = 0,
.reg_width = 8,
.label = "upper calibration",
},
{
.name = "azoteq,gesture-max-ms",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_TAP,
.reg_offset = 9,
.reg_shift = 8,
.reg_width = 8,
.val_pitch = 16,
.label = "maximum gesture time",
},
{
.name = "azoteq,gesture-max-ms",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_TAP_LEGACY,
.reg_offset = 9,
.reg_shift = 8,
.reg_width = 8,
.val_pitch = 4,
.label = "maximum gesture time",
},
{
.name = "azoteq,gesture-min-ms",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_TAP,
.reg_offset = 9,
.reg_shift = 3,
.reg_width = 5,
.val_pitch = 16,
.label = "minimum gesture time",
},
{
.name = "azoteq,gesture-min-ms",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_TAP_LEGACY,
.reg_offset = 9,
.reg_shift = 3,
.reg_width = 5,
.val_pitch = 4,
.label = "minimum gesture time",
},
{
.name = "azoteq,gesture-dist",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_AXIAL,
.reg_offset = 10,
.reg_shift = 8,
.reg_width = 8,
.val_pitch = 16,
.label = "gesture distance",
},
{
.name = "azoteq,gesture-dist",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_AXIAL_LEGACY,
.reg_offset = 10,
.reg_shift = 8,
.reg_width = 8,
.val_pitch = 16,
.label = "gesture distance",
},
{
.name = "azoteq,gesture-max-ms",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_AXIAL,
.reg_offset = 10,
.reg_shift = 0,
.reg_width = 8,
.val_pitch = 16,
.label = "maximum gesture time",
},
{
.name = "azoteq,gesture-max-ms",
.reg_grp = IQS7222_REG_GRP_SLDR,
.reg_key = IQS7222_REG_KEY_AXIAL_LEGACY,
.reg_offset = 10,
.reg_shift = 0,
.reg_width = 8,
.val_pitch = 4,
.label = "maximum gesture time",
},
{
.name = "azoteq,num-rows",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_offset = 0,
.reg_shift = 4,
.reg_width = 4,
.val_min = 1,
.val_max = 12,
.label = "number of rows",
},
{
.name = "azoteq,num-cols",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_offset = 0,
.reg_shift = 0,
.reg_width = 4,
.val_min = 1,
.val_max = 12,
.label = "number of columns",
},
{
.name = "azoteq,lower-cal-y",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_offset = 1,
.reg_shift = 8,
.reg_width = 8,
.label = "lower vertical calibration",
},
{
.name = "azoteq,lower-cal-x",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_offset = 1,
.reg_shift = 0,
.reg_width = 8,
.label = "lower horizontal calibration",
},
{
.name = "azoteq,upper-cal-y",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_offset = 2,
.reg_shift = 8,
.reg_width = 8,
.label = "upper vertical calibration",
},
{
.name = "azoteq,upper-cal-x",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_offset = 2,
.reg_shift = 0,
.reg_width = 8,
.label = "upper horizontal calibration",
},
{
.name = "azoteq,top-speed",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_offset = 3,
.reg_shift = 8,
.reg_width = 8,
.val_pitch = 4,
.label = "top speed",
},
{
.name = "azoteq,bottom-speed",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_offset = 3,
.reg_shift = 0,
.reg_width = 8,
.label = "bottom speed",
},
{
.name = "azoteq,gesture-min-ms",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_key = IQS7222_REG_KEY_TAP,
.reg_offset = 20,
.reg_shift = 8,
.reg_width = 8,
.val_pitch = 16,
.label = "minimum gesture time",
},
{
.name = "azoteq,gesture-max-ms",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_key = IQS7222_REG_KEY_AXIAL,
.reg_offset = 21,
.reg_shift = 8,
.reg_width = 8,
.val_pitch = 16,
.label = "maximum gesture time",
},
{
.name = "azoteq,gesture-max-ms",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_key = IQS7222_REG_KEY_TAP,
.reg_offset = 21,
.reg_shift = 0,
.reg_width = 8,
.val_pitch = 16,
.label = "maximum gesture time",
},
{
.name = "azoteq,gesture-dist",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_key = IQS7222_REG_KEY_TAP,
.reg_offset = 22,
.reg_shift = 0,
.reg_width = 16,
.label = "gesture distance",
},
{
.name = "azoteq,gesture-dist",
.reg_grp = IQS7222_REG_GRP_TPAD,
.reg_key = IQS7222_REG_KEY_AXIAL,
.reg_offset = 23,
.reg_shift = 0,
.reg_width = 16,
.label = "gesture distance",
},
{
.name = "drive-open-drain",
.reg_grp = IQS7222_REG_GRP_GPIO,
.reg_offset = 0,
.reg_shift = 1,
.reg_width = 1,
},
{
.name = "azoteq,timeout-ati-ms",
.reg_grp = IQS7222_REG_GRP_SYS,
.reg_offset = 1,
.reg_shift = 0,
.reg_width = 16,
.val_pitch = 500,
.label = "ATI error timeout",
},
{
.name = "azoteq,rate-ati-ms",
.reg_grp = IQS7222_REG_GRP_SYS,
.reg_offset = 2,
.reg_shift = 0,
.reg_width = 16,
.label = "ATI report rate",
},
{
.name = "azoteq,timeout-np-ms",
.reg_grp = IQS7222_REG_GRP_SYS,
.reg_offset = 3,
.reg_shift = 0,
.reg_width = 16,
.label = "normal-power mode timeout",
},
{
.name = "azoteq,rate-np-ms",
.reg_grp = IQS7222_REG_GRP_SYS,
.reg_offset = 4,
.reg_shift = 0,
.reg_width = 16,
.val_max = 3000,
.label = "normal-power mode report rate",
},
{
.name = "azoteq,timeout-lp-ms",
.reg_grp = IQS7222_REG_GRP_SYS,
.reg_offset = 5,
.reg_shift = 0,
.reg_width = 16,
.label = "low-power mode timeout",
},
{
.name = "azoteq,rate-lp-ms",
.reg_grp = IQS7222_REG_GRP_SYS,
.reg_offset = 6,
.reg_shift = 0,
.reg_width = 16,
.val_max = 3000,
.label = "low-power mode report rate",
},
{
.name = "azoteq,timeout-ulp-ms",
.reg_grp = IQS7222_REG_GRP_SYS,
.reg_offset = 7,
.reg_shift = 0,
.reg_width = 16,
.label = "ultra-low-power mode timeout",
},
{
.name = "azoteq,rate-ulp-ms",
.reg_grp = IQS7222_REG_GRP_SYS,
.reg_offset = 8,
.reg_shift = 0,
.reg_width = 16,
.val_max = 3000,
.label = "ultra-low-power mode report rate",
},
};
struct iqs7222_private {
const struct iqs7222_dev_desc *dev_desc;
struct gpio_desc *reset_gpio;
struct gpio_desc *irq_gpio;
struct i2c_client *client;
struct input_dev *keypad;
struct touchscreen_properties prop;
unsigned int kp_type[IQS7222_MAX_CHAN][ARRAY_SIZE(iqs7222_kp_events)];
unsigned int kp_code[IQS7222_MAX_CHAN][ARRAY_SIZE(iqs7222_kp_events)];
unsigned int sl_code[IQS7222_MAX_SLDR][ARRAY_SIZE(iqs7222_sl_events)];
unsigned int sl_axis[IQS7222_MAX_SLDR];
unsigned int tp_code[ARRAY_SIZE(iqs7222_tp_events)];
u16 cycle_setup[IQS7222_MAX_CHAN / 2][IQS7222_MAX_COLS_CYCLE];
u16 glbl_setup[IQS7222_MAX_COLS_GLBL];
u16 btn_setup[IQS7222_MAX_CHAN][IQS7222_MAX_COLS_BTN];
u16 chan_setup[IQS7222_MAX_CHAN][IQS7222_MAX_COLS_CHAN];
u16 filt_setup[IQS7222_MAX_COLS_FILT];
u16 sldr_setup[IQS7222_MAX_SLDR][IQS7222_MAX_COLS_SLDR];
u16 tpad_setup[IQS7222_MAX_COLS_TPAD];
u16 gpio_setup[ARRAY_SIZE(iqs7222_gpio_links)][IQS7222_MAX_COLS_GPIO];
u16 sys_setup[IQS7222_MAX_COLS_SYS];
};
static u16 *iqs7222_setup(struct iqs7222_private *iqs7222,
enum iqs7222_reg_grp_id reg_grp, int row)
{
switch (reg_grp) {
case IQS7222_REG_GRP_CYCLE:
return iqs7222->cycle_setup[row];
case IQS7222_REG_GRP_GLBL:
return iqs7222->glbl_setup;
case IQS7222_REG_GRP_BTN:
return iqs7222->btn_setup[row];
case IQS7222_REG_GRP_CHAN:
return iqs7222->chan_setup[row];
case IQS7222_REG_GRP_FILT:
return iqs7222->filt_setup;
case IQS7222_REG_GRP_SLDR:
return iqs7222->sldr_setup[row];
case IQS7222_REG_GRP_TPAD:
return iqs7222->tpad_setup;
case IQS7222_REG_GRP_GPIO:
return iqs7222->gpio_setup[row];
case IQS7222_REG_GRP_SYS:
return iqs7222->sys_setup;
default:
return NULL;
}
}
static int iqs7222_irq_poll(struct iqs7222_private *iqs7222, u16 timeout_ms)
{
ktime_t irq_timeout = ktime_add_ms(ktime_get(), timeout_ms);
int ret;
do {
usleep_range(1000, 1100);
ret = gpiod_get_value_cansleep(iqs7222->irq_gpio);
if (ret < 0)
return ret;
else if (ret > 0)
return 0;
} while (ktime_compare(ktime_get(), irq_timeout) < 0);
return -EBUSY;
}
static int iqs7222_hard_reset(struct iqs7222_private *iqs7222)
{
struct i2c_client *client = iqs7222->client;
int error;
if (!iqs7222->reset_gpio)
return 0;
gpiod_set_value_cansleep(iqs7222->reset_gpio, 1);
usleep_range(1000, 1100);
gpiod_set_value_cansleep(iqs7222->reset_gpio, 0);
error = iqs7222_irq_poll(iqs7222, IQS7222_RESET_TIMEOUT_MS);
if (error)
dev_err(&client->dev, "Failed to reset device: %d\n", error);
return error;
}
static int iqs7222_force_comms(struct iqs7222_private *iqs7222)
{
u8 msg_buf[] = { 0xFF, };
int ret;
/*
* The device cannot communicate until it asserts its interrupt (RDY)
* pin. Attempts to do so while RDY is deasserted return an ACK; how-
* ever all write data is ignored, and all read data returns 0xEE.
*
* Unsolicited communication must be preceded by a special force com-
* munication command, after which the device eventually asserts its
* RDY pin and agrees to communicate.
*
* Regardless of whether communication is forced or the result of an
* interrupt, the device automatically deasserts its RDY pin once it
* detects an I2C stop condition, or a timeout expires.
*/
ret = gpiod_get_value_cansleep(iqs7222->irq_gpio);
if (ret < 0)
return ret;
else if (ret > 0)
return 0;
ret = i2c_master_send(iqs7222->client, msg_buf, sizeof(msg_buf));
if (ret < (int)sizeof(msg_buf)) {
if (ret >= 0)
ret = -EIO;
/*
* The datasheet states that the host must wait to retry any
* failed attempt to communicate over I2C.
*/
msleep(IQS7222_COMMS_RETRY_MS);
return ret;
}
return iqs7222_irq_poll(iqs7222, IQS7222_COMMS_TIMEOUT_MS);
}
static int iqs7222_read_burst(struct iqs7222_private *iqs7222,
u16 reg, void *val, u16 num_val)
{
u8 reg_buf[sizeof(__be16)];
int ret, i;
struct i2c_client *client = iqs7222->client;
struct i2c_msg msg[] = {
{
.addr = client->addr,
.flags = 0,
.len = reg > U8_MAX ? sizeof(reg) : sizeof(u8),
.buf = reg_buf,
},
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = num_val * sizeof(__le16),
.buf = (u8 *)val,
},
};
if (reg > U8_MAX)
put_unaligned_be16(reg, reg_buf);
else
*reg_buf = (u8)reg;
/*
* The following loop protects against an edge case in which the RDY
* pin is automatically deasserted just as the read is initiated. In
* that case, the read must be retried using forced communication.
*/
for (i = 0; i < IQS7222_NUM_RETRIES; i++) {
ret = iqs7222_force_comms(iqs7222);
if (ret < 0)
continue;
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
if (ret < (int)ARRAY_SIZE(msg)) {
if (ret >= 0)
ret = -EIO;
msleep(IQS7222_COMMS_RETRY_MS);
continue;
}
if (get_unaligned_le16(msg[1].buf) == IQS7222_COMMS_ERROR) {
ret = -ENODATA;
continue;
}
ret = 0;
break;
}
/*
* The following delay ensures the device has deasserted the RDY pin
* following the I2C stop condition.
*/
usleep_range(50, 100);
if (ret < 0)
dev_err(&client->dev,
"Failed to read from address 0x%04X: %d\n", reg, ret);
return ret;
}
static int iqs7222_read_word(struct iqs7222_private *iqs7222, u16 reg, u16 *val)
{
__le16 val_buf;
int error;
error = iqs7222_read_burst(iqs7222, reg, &val_buf, 1);
if (error)
return error;
*val = le16_to_cpu(val_buf);
return 0;
}
static int iqs7222_write_burst(struct iqs7222_private *iqs7222,
u16 reg, const void *val, u16 num_val)
{
int reg_len = reg > U8_MAX ? sizeof(reg) : sizeof(u8);
int val_len = num_val * sizeof(__le16);
int msg_len = reg_len + val_len;
int ret, i;
struct i2c_client *client = iqs7222->client;
u8 *msg_buf;
msg_buf = kzalloc(msg_len, GFP_KERNEL);
if (!msg_buf)
return -ENOMEM;
if (reg > U8_MAX)
put_unaligned_be16(reg, msg_buf);
else
*msg_buf = (u8)reg;
memcpy(msg_buf + reg_len, val, val_len);
/*
* The following loop protects against an edge case in which the RDY
* pin is automatically asserted just before the force communication
* command is sent.
*
* In that case, the subsequent I2C stop condition tricks the device
* into preemptively deasserting the RDY pin and the command must be
* sent again.
*/
for (i = 0; i < IQS7222_NUM_RETRIES; i++) {
ret = iqs7222_force_comms(iqs7222);
if (ret < 0)
continue;
ret = i2c_master_send(client, msg_buf, msg_len);
if (ret < msg_len) {
if (ret >= 0)
ret = -EIO;
msleep(IQS7222_COMMS_RETRY_MS);
continue;
}
ret = 0;
break;
}
kfree(msg_buf);
usleep_range(50, 100);
if (ret < 0)
dev_err(&client->dev,
"Failed to write to address 0x%04X: %d\n", reg, ret);
return ret;
}
static int iqs7222_write_word(struct iqs7222_private *iqs7222, u16 reg, u16 val)
{
__le16 val_buf = cpu_to_le16(val);
return iqs7222_write_burst(iqs7222, reg, &val_buf, 1);
}
static int iqs7222_ati_trigger(struct iqs7222_private *iqs7222)
{
struct i2c_client *client = iqs7222->client;
ktime_t ati_timeout;
u16 sys_status = 0;
u16 sys_setup;
int error, i;
/*
* The reserved fields of the system setup register may have changed
* as a result of other registers having been written. As such, read
* the register's latest value to avoid unexpected behavior when the
* register is written in the loop that follows.
*/
error = iqs7222_read_word(iqs7222, IQS7222_SYS_SETUP, &sys_setup);
if (error)
return error;
for (i = 0; i < IQS7222_NUM_RETRIES; i++) {
/*
* Trigger ATI from streaming and normal-power modes so that
* the RDY pin continues to be asserted during ATI.
*/
error = iqs7222_write_word(iqs7222, IQS7222_SYS_SETUP,
sys_setup |
IQS7222_SYS_SETUP_REDO_ATI);
if (error)
return error;
ati_timeout = ktime_add_ms(ktime_get(), IQS7222_ATI_TIMEOUT_MS);
do {
error = iqs7222_irq_poll(iqs7222,
IQS7222_COMMS_TIMEOUT_MS);
if (error)
continue;
error = iqs7222_read_word(iqs7222, IQS7222_SYS_STATUS,
&sys_status);
if (error)
return error;
if (sys_status & IQS7222_SYS_STATUS_RESET)
return 0;
if (sys_status & IQS7222_SYS_STATUS_ATI_ERROR)
break;
if (sys_status & IQS7222_SYS_STATUS_ATI_ACTIVE)
continue;
/*
* Use stream-in-touch mode if either slider reports
* absolute position.
*/
sys_setup |= test_bit(EV_ABS, iqs7222->keypad->evbit)
? IQS7222_SYS_SETUP_INTF_MODE_TOUCH
: IQS7222_SYS_SETUP_INTF_MODE_EVENT;
sys_setup |= IQS7222_SYS_SETUP_PWR_MODE_AUTO;
return iqs7222_write_word(iqs7222, IQS7222_SYS_SETUP,
sys_setup);
} while (ktime_compare(ktime_get(), ati_timeout) < 0);
dev_err(&client->dev,
"ATI attempt %d of %d failed with status 0x%02X, %s\n",
i + 1, IQS7222_NUM_RETRIES, (u8)sys_status,
i + 1 < IQS7222_NUM_RETRIES ? "retrying" : "stopping");
}
return -ETIMEDOUT;
}
static int iqs7222_dev_init(struct iqs7222_private *iqs7222, int dir)
{
const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc;
int comms_offset = dev_desc->comms_offset;
int error, i, j, k;
/*
* Acknowledge reset before writing any registers in case the device
* suffers a spurious reset during initialization. Because this step
* may change the reserved fields of the second filter beta register,
* its cache must be updated.
*
* Writing the second filter beta register, in turn, may clobber the
* system status register. As such, the filter beta register pair is
* written first to protect against this hazard.
*/
if (dir == WRITE) {
u16 reg = dev_desc->reg_grps[IQS7222_REG_GRP_FILT].base + 1;
u16 filt_setup;
error = iqs7222_write_word(iqs7222, IQS7222_SYS_SETUP,
iqs7222->sys_setup[0] |
IQS7222_SYS_SETUP_ACK_RESET);
if (error)
return error;
error = iqs7222_read_word(iqs7222, reg, &filt_setup);
if (error)
return error;
iqs7222->filt_setup[1] &= GENMASK(7, 0);
iqs7222->filt_setup[1] |= (filt_setup & ~GENMASK(7, 0));
}
/*
* Take advantage of the stop-bit disable function, if available, to
* save the trouble of having to reopen a communication window after
* each burst read or write.
*/
if (comms_offset) {
u16 comms_setup;
error = iqs7222_read_word(iqs7222,
IQS7222_SYS_SETUP + comms_offset,
&comms_setup);
if (error)
return error;
error = iqs7222_write_word(iqs7222,
IQS7222_SYS_SETUP + comms_offset,
comms_setup | IQS7222_COMMS_HOLD);
if (error)
return error;
}
for (i = 0; i < IQS7222_NUM_REG_GRPS; i++) {
int num_row = dev_desc->reg_grps[i].num_row;
int num_col = dev_desc->reg_grps[i].num_col;
u16 reg = dev_desc->reg_grps[i].base;
__le16 *val_buf;
u16 *val;
if (!num_col)
continue;
val = iqs7222_setup(iqs7222, i, 0);
if (!val)
continue;
val_buf = kcalloc(num_col, sizeof(__le16), GFP_KERNEL);
if (!val_buf)
return -ENOMEM;
for (j = 0; j < num_row; j++) {
switch (dir) {
case READ:
error = iqs7222_read_burst(iqs7222, reg,
val_buf, num_col);
for (k = 0; k < num_col; k++)
val[k] = le16_to_cpu(val_buf[k]);
break;
case WRITE:
for (k = 0; k < num_col; k++)
val_buf[k] = cpu_to_le16(val[k]);
error = iqs7222_write_burst(iqs7222, reg,
val_buf, num_col);
break;
default:
error = -EINVAL;
}
if (error)
break;
reg += IQS7222_REG_OFFSET;
val += iqs7222_max_cols[i];
}
kfree(val_buf);
if (error)
return error;
}
if (comms_offset) {
u16 comms_setup;
error = iqs7222_read_word(iqs7222,
IQS7222_SYS_SETUP + comms_offset,
&comms_setup);
if (error)
return error;
error = iqs7222_write_word(iqs7222,
IQS7222_SYS_SETUP + comms_offset,
comms_setup & ~IQS7222_COMMS_HOLD);
if (error)
return error;
}
if (dir == READ) {
iqs7222->sys_setup[0] &= ~IQS7222_SYS_SETUP_INTF_MODE_MASK;
iqs7222->sys_setup[0] &= ~IQS7222_SYS_SETUP_PWR_MODE_MASK;
return 0;
}
return iqs7222_ati_trigger(iqs7222);
}
static int iqs7222_dev_info(struct iqs7222_private *iqs7222)
{
struct i2c_client *client = iqs7222->client;
bool prod_num_valid = false;
__le16 dev_id[3];
int error, i;
error = iqs7222_read_burst(iqs7222, IQS7222_PROD_NUM, dev_id,
ARRAY_SIZE(dev_id));
if (error)
return error;
for (i = 0; i < ARRAY_SIZE(iqs7222_devs); i++) {
if (le16_to_cpu(dev_id[0]) != iqs7222_devs[i].prod_num)
continue;
prod_num_valid = true;
if (le16_to_cpu(dev_id[1]) < iqs7222_devs[i].fw_major)
continue;
if (le16_to_cpu(dev_id[2]) < iqs7222_devs[i].fw_minor)
continue;
iqs7222->dev_desc = &iqs7222_devs[i];
return 0;
}
if (prod_num_valid)
dev_err(&client->dev, "Unsupported firmware revision: %u.%u\n",
le16_to_cpu(dev_id[1]), le16_to_cpu(dev_id[2]));
else
dev_err(&client->dev, "Unrecognized product number: %u\n",
le16_to_cpu(dev_id[0]));
return -EINVAL;
}
static int iqs7222_gpio_select(struct iqs7222_private *iqs7222,
struct fwnode_handle *child_node,
int child_enable, u16 child_link)
{
const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc;
struct i2c_client *client = iqs7222->client;
int num_gpio = dev_desc->reg_grps[IQS7222_REG_GRP_GPIO].num_row;
int error, count, i;
unsigned int gpio_sel[ARRAY_SIZE(iqs7222_gpio_links)];
if (!num_gpio)
return 0;
if (!fwnode_property_present(child_node, "azoteq,gpio-select"))
return 0;
count = fwnode_property_count_u32(child_node, "azoteq,gpio-select");
if (count > num_gpio) {
dev_err(&client->dev, "Invalid number of %s GPIOs\n",
fwnode_get_name(child_node));
return -EINVAL;
} else if (count < 0) {
dev_err(&client->dev, "Failed to count %s GPIOs: %d\n",
fwnode_get_name(child_node), count);
return count;
}
error = fwnode_property_read_u32_array(child_node,
"azoteq,gpio-select",
gpio_sel, count);
if (error) {
dev_err(&client->dev, "Failed to read %s GPIOs: %d\n",
fwnode_get_name(child_node), error);
return error;
}
for (i = 0; i < count; i++) {
u16 *gpio_setup;
if (gpio_sel[i] >= num_gpio) {
dev_err(&client->dev, "Invalid %s GPIO: %u\n",
fwnode_get_name(child_node), gpio_sel[i]);
return -EINVAL;
}
gpio_setup = iqs7222->gpio_setup[gpio_sel[i]];
if (gpio_setup[2] && child_link != gpio_setup[2]) {
dev_err(&client->dev,
"Conflicting GPIO %u event types\n",
gpio_sel[i]);
return -EINVAL;
}
gpio_setup[0] |= IQS7222_GPIO_SETUP_0_GPIO_EN;
gpio_setup[1] |= child_enable;
gpio_setup[2] = child_link;
}
return 0;
}
static int iqs7222_parse_props(struct iqs7222_private *iqs7222,
struct fwnode_handle *reg_grp_node,
int reg_grp_index,
enum iqs7222_reg_grp_id reg_grp,
enum iqs7222_reg_key_id reg_key)
{
u16 *setup = iqs7222_setup(iqs7222, reg_grp, reg_grp_index);
struct i2c_client *client = iqs7222->client;
int i;
if (!setup)
return 0;
for (i = 0; i < ARRAY_SIZE(iqs7222_props); i++) {
const char *name = iqs7222_props[i].name;
int reg_offset = iqs7222_props[i].reg_offset;
int reg_shift = iqs7222_props[i].reg_shift;
int reg_width = iqs7222_props[i].reg_width;
int val_pitch = iqs7222_props[i].val_pitch ? : 1;
int val_min = iqs7222_props[i].val_min;
int val_max = iqs7222_props[i].val_max;
bool invert = iqs7222_props[i].invert;
const char *label = iqs7222_props[i].label ? : name;
unsigned int val;
int error;
if (iqs7222_props[i].reg_grp != reg_grp ||
iqs7222_props[i].reg_key != reg_key)
continue;
/*
* Boolean register fields are one bit wide; they are forcibly
* reset to provide a means to undo changes by a bootloader if
* necessary.
*
* Scalar fields, on the other hand, are left untouched unless
* their corresponding properties are present.
*/
if (reg_width == 1) {
if (invert)
setup[reg_offset] |= BIT(reg_shift);
else
setup[reg_offset] &= ~BIT(reg_shift);
}
if (!fwnode_property_present(reg_grp_node, name))
continue;
if (reg_width == 1) {
if (invert)
setup[reg_offset] &= ~BIT(reg_shift);
else
setup[reg_offset] |= BIT(reg_shift);
continue;
}
error = fwnode_property_read_u32(reg_grp_node, name, &val);
if (error) {
dev_err(&client->dev, "Failed to read %s %s: %d\n",
fwnode_get_name(reg_grp_node), label, error);
return error;
}
if (!val_max)
val_max = GENMASK(reg_width - 1, 0) * val_pitch;
if (val < val_min || val > val_max) {
dev_err(&client->dev, "Invalid %s %s: %u\n",
fwnode_get_name(reg_grp_node), label, val);
return -EINVAL;
}
setup[reg_offset] &= ~GENMASK(reg_shift + reg_width - 1,
reg_shift);
setup[reg_offset] |= (val / val_pitch << reg_shift);
}
return 0;
}
static int iqs7222_parse_event(struct iqs7222_private *iqs7222,
struct fwnode_handle *event_node,
int reg_grp_index,
enum iqs7222_reg_grp_id reg_grp,
enum iqs7222_reg_key_id reg_key,
u16 event_enable, u16 event_link,
unsigned int *event_type,
unsigned int *event_code)
{
struct i2c_client *client = iqs7222->client;
int error;
error = iqs7222_parse_props(iqs7222, event_node, reg_grp_index,
reg_grp, reg_key);
if (error)
return error;
error = iqs7222_gpio_select(iqs7222, event_node, event_enable,
event_link);
if (error)
return error;
error = fwnode_property_read_u32(event_node, "linux,code", event_code);
if (error == -EINVAL) {
return 0;
} else if (error) {
dev_err(&client->dev, "Failed to read %s code: %d\n",
fwnode_get_name(event_node), error);
return error;
}
if (!event_type) {
input_set_capability(iqs7222->keypad, EV_KEY, *event_code);
return 0;
}
error = fwnode_property_read_u32(event_node, "linux,input-type",
event_type);
if (error == -EINVAL) {
*event_type = EV_KEY;
} else if (error) {
dev_err(&client->dev, "Failed to read %s input type: %d\n",
fwnode_get_name(event_node), error);
return error;
} else if (*event_type != EV_KEY && *event_type != EV_SW) {
dev_err(&client->dev, "Invalid %s input type: %d\n",
fwnode_get_name(event_node), *event_type);
return -EINVAL;
}
input_set_capability(iqs7222->keypad, *event_type, *event_code);
return 0;
}
static int iqs7222_parse_cycle(struct iqs7222_private *iqs7222,
struct fwnode_handle *cycle_node, int cycle_index)
{
u16 *cycle_setup = iqs7222->cycle_setup[cycle_index];
struct i2c_client *client = iqs7222->client;
unsigned int pins[9];
int error, count, i;
/*
* Each channel shares a cycle with one other channel; the mapping of
* channels to cycles is fixed. Properties defined for a cycle impact
* both channels tied to the cycle.
*
* Unlike channels which are restricted to a select range of CRx pins
* based on channel number, any cycle can claim any of the device's 9
* CTx pins (CTx0-8).
*/
if (!fwnode_property_present(cycle_node, "azoteq,tx-enable"))
return 0;
count = fwnode_property_count_u32(cycle_node, "azoteq,tx-enable");
if (count < 0) {
dev_err(&client->dev, "Failed to count %s CTx pins: %d\n",
fwnode_get_name(cycle_node), count);
return count;
} else if (count > ARRAY_SIZE(pins)) {
dev_err(&client->dev, "Invalid number of %s CTx pins\n",
fwnode_get_name(cycle_node));
return -EINVAL;
}
error = fwnode_property_read_u32_array(cycle_node, "azoteq,tx-enable",
pins, count);
if (error) {
dev_err(&client->dev, "Failed to read %s CTx pins: %d\n",
fwnode_get_name(cycle_node), error);
return error;
}
cycle_setup[1] &= ~GENMASK(7 + ARRAY_SIZE(pins) - 1, 7);
for (i = 0; i < count; i++) {
if (pins[i] > 8) {
dev_err(&client->dev, "Invalid %s CTx pin: %u\n",
fwnode_get_name(cycle_node), pins[i]);
return -EINVAL;
}
cycle_setup[1] |= BIT(pins[i] + 7);
}
return 0;
}
static int iqs7222_parse_chan(struct iqs7222_private *iqs7222,
struct fwnode_handle *chan_node, int chan_index)
{
const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc;
struct i2c_client *client = iqs7222->client;
int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row;
int ext_chan = rounddown(num_chan, 10);
int error, i;
u16 *chan_setup = iqs7222->chan_setup[chan_index];
u16 *sys_setup = iqs7222->sys_setup;
unsigned int val;
if (dev_desc->allow_offset &&
fwnode_property_present(chan_node, "azoteq,ulp-allow"))
sys_setup[dev_desc->allow_offset] &= ~BIT(chan_index);
chan_setup[0] |= IQS7222_CHAN_SETUP_0_CHAN_EN;
/*
* The reference channel function allows for differential measurements
* and is only available in the case of IQS7222A or IQS7222C.
*/
if (dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_col > 4 &&
fwnode_property_present(chan_node, "azoteq,ref-select")) {
u16 *ref_setup;
error = fwnode_property_read_u32(chan_node, "azoteq,ref-select",
&val);
if (error) {
dev_err(&client->dev,
"Failed to read %s reference channel: %d\n",
fwnode_get_name(chan_node), error);
return error;
}
if (val >= ext_chan) {
dev_err(&client->dev,
"Invalid %s reference channel: %u\n",
fwnode_get_name(chan_node), val);
return -EINVAL;
}
ref_setup = iqs7222->chan_setup[val];
/*
* Configure the current channel as a follower of the selected
* reference channel.
*/
chan_setup[0] |= IQS7222_CHAN_SETUP_0_REF_MODE_FOLLOW;
chan_setup[4] = val * 42 + 1048;
error = fwnode_property_read_u32(chan_node, "azoteq,ref-weight",
&val);
if (!error) {
if (val > U16_MAX) {
dev_err(&client->dev,
"Invalid %s reference weight: %u\n",
fwnode_get_name(chan_node), val);
return -EINVAL;
}
chan_setup[5] = val;
} else if (error != -EINVAL) {
dev_err(&client->dev,
"Failed to read %s reference weight: %d\n",
fwnode_get_name(chan_node), error);
return error;
}
/*
* Configure the selected channel as a reference channel which
* serves the current channel.
*/
ref_setup[0] |= IQS7222_CHAN_SETUP_0_REF_MODE_REF;
ref_setup[5] |= BIT(chan_index);
ref_setup[4] = dev_desc->touch_link;
if (fwnode_property_present(chan_node, "azoteq,use-prox"))
ref_setup[4] -= 2;
} else if (dev_desc->reg_grps[IQS7222_REG_GRP_TPAD].num_row &&
fwnode_property_present(chan_node,
"azoteq,counts-filt-enable")) {
/*
* In the case of IQS7222D, however, the reference mode field
* is partially repurposed as a counts filter enable control.
*/
chan_setup[0] |= IQS7222_CHAN_SETUP_0_REF_MODE_REF;
}
if (fwnode_property_present(chan_node, "azoteq,rx-enable")) {
/*
* Each channel can claim up to 4 CRx pins. The first half of
* the channels can use CRx0-3, while the second half can use
* CRx4-7.
*/
unsigned int pins[4];
int count;
count = fwnode_property_count_u32(chan_node,
"azoteq,rx-enable");
if (count < 0) {
dev_err(&client->dev,
"Failed to count %s CRx pins: %d\n",
fwnode_get_name(chan_node), count);
return count;
} else if (count > ARRAY_SIZE(pins)) {
dev_err(&client->dev,
"Invalid number of %s CRx pins\n",
fwnode_get_name(chan_node));
return -EINVAL;
}
error = fwnode_property_read_u32_array(chan_node,
"azoteq,rx-enable",
pins, count);
if (error) {
dev_err(&client->dev,
"Failed to read %s CRx pins: %d\n",
fwnode_get_name(chan_node), error);
return error;
}
chan_setup[0] &= ~GENMASK(4 + ARRAY_SIZE(pins) - 1, 4);
for (i = 0; i < count; i++) {
int min_crx = chan_index < ext_chan / 2 ? 0 : 4;
if (pins[i] < min_crx || pins[i] > min_crx + 3) {
dev_err(&client->dev,
"Invalid %s CRx pin: %u\n",
fwnode_get_name(chan_node), pins[i]);
return -EINVAL;
}
chan_setup[0] |= BIT(pins[i] + 4 - min_crx);
}
}
for (i = 0; i < ARRAY_SIZE(iqs7222_kp_events); i++) {
const char *event_name = iqs7222_kp_events[i].name;
u16 event_enable = iqs7222_kp_events[i].enable;
struct fwnode_handle *event_node;
event_node = fwnode_get_named_child_node(chan_node, event_name);
if (!event_node)
continue;
error = fwnode_property_read_u32(event_node,
"azoteq,timeout-press-ms",
&val);
if (!error) {
/*
* The IQS7222B employs a global pair of press timeout
* registers as opposed to channel-specific registers.
*/
u16 *setup = dev_desc->reg_grps
[IQS7222_REG_GRP_BTN].num_col > 2 ?
&iqs7222->btn_setup[chan_index][2] :
&sys_setup[9];
if (val > U8_MAX * 500) {
dev_err(&client->dev,
"Invalid %s press timeout: %u\n",
fwnode_get_name(event_node), val);
fwnode_handle_put(event_node);
return -EINVAL;
}
*setup &= ~(U8_MAX << i * 8);
*setup |= (val / 500 << i * 8);
} else if (error != -EINVAL) {
dev_err(&client->dev,
"Failed to read %s press timeout: %d\n",
fwnode_get_name(event_node), error);
fwnode_handle_put(event_node);
return error;
}
error = iqs7222_parse_event(iqs7222, event_node, chan_index,
IQS7222_REG_GRP_BTN,
iqs7222_kp_events[i].reg_key,
BIT(chan_index),
dev_desc->touch_link - (i ? 0 : 2),
&iqs7222->kp_type[chan_index][i],
&iqs7222->kp_code[chan_index][i]);
fwnode_handle_put(event_node);
if (error)
return error;
if (!dev_desc->event_offset)
continue;
sys_setup[dev_desc->event_offset] |= event_enable;
}
/*
* The following call handles a special pair of properties that apply
* to a channel node, but reside within the button (event) group.
*/
return iqs7222_parse_props(iqs7222, chan_node, chan_index,
IQS7222_REG_GRP_BTN,
IQS7222_REG_KEY_DEBOUNCE);
}
static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222,
struct fwnode_handle *sldr_node, int sldr_index)
{
const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc;
struct i2c_client *client = iqs7222->client;
int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row;
int ext_chan = rounddown(num_chan, 10);
int count, error, reg_offset, i;
u16 *event_mask = &iqs7222->sys_setup[dev_desc->event_offset];
u16 *sldr_setup = iqs7222->sldr_setup[sldr_index];
unsigned int chan_sel[4], val;
/*
* Each slider can be spread across 3 to 4 channels. It is possible to
* select only 2 channels, but doing so prevents the slider from using
* the specified resolution.
*/
count = fwnode_property_count_u32(sldr_node, "azoteq,channel-select");
if (count < 0) {
dev_err(&client->dev, "Failed to count %s channels: %d\n",
fwnode_get_name(sldr_node), count);
return count;
} else if (count < 3 || count > ARRAY_SIZE(chan_sel)) {
dev_err(&client->dev, "Invalid number of %s channels\n",
fwnode_get_name(sldr_node));
return -EINVAL;
}
error = fwnode_property_read_u32_array(sldr_node,
"azoteq,channel-select",
chan_sel, count);
if (error) {
dev_err(&client->dev, "Failed to read %s channels: %d\n",
fwnode_get_name(sldr_node), error);
return error;
}
/*
* Resolution and top speed, if small enough, are packed into a single
* register. Otherwise, each occupies its own register and the rest of
* the slider-related register addresses are offset by one.
*/
reg_offset = dev_desc->sldr_res < U16_MAX ? 0 : 1;
sldr_setup[0] |= count;
sldr_setup[3 + reg_offset] &= ~GENMASK(ext_chan - 1, 0);
for (i = 0; i < ARRAY_SIZE(chan_sel); i++) {
sldr_setup[5 + reg_offset + i] = 0;
if (i >= count)
continue;
if (chan_sel[i] >= ext_chan) {
dev_err(&client->dev, "Invalid %s channel: %u\n",
fwnode_get_name(sldr_node), chan_sel[i]);
return -EINVAL;
}
/*
* The following fields indicate which channels participate in
* the slider, as well as each channel's relative placement.
*/
sldr_setup[3 + reg_offset] |= BIT(chan_sel[i]);
sldr_setup[5 + reg_offset + i] = chan_sel[i] * 42 + 1080;
}
sldr_setup[4 + reg_offset] = dev_desc->touch_link;
if (fwnode_property_present(sldr_node, "azoteq,use-prox"))
sldr_setup[4 + reg_offset] -= 2;
error = fwnode_property_read_u32(sldr_node, "azoteq,slider-size", &val);
if (!error) {
if (val > dev_desc->sldr_res) {
dev_err(&client->dev, "Invalid %s size: %u\n",
fwnode_get_name(sldr_node), val);
return -EINVAL;
}
if (reg_offset) {
sldr_setup[3] = val;
} else {
sldr_setup[2] &= ~IQS7222_SLDR_SETUP_2_RES_MASK;
sldr_setup[2] |= (val / 16 <<
IQS7222_SLDR_SETUP_2_RES_SHIFT);
}
} else if (error != -EINVAL) {
dev_err(&client->dev, "Failed to read %s size: %d\n",
fwnode_get_name(sldr_node), error);
return error;
}
if (!(reg_offset ? sldr_setup[3]
: sldr_setup[2] & IQS7222_SLDR_SETUP_2_RES_MASK)) {
dev_err(&client->dev, "Undefined %s size\n",
fwnode_get_name(sldr_node));
return -EINVAL;
}
error = fwnode_property_read_u32(sldr_node, "azoteq,top-speed", &val);
if (!error) {
if (val > (reg_offset ? U16_MAX : U8_MAX * 4)) {
dev_err(&client->dev, "Invalid %s top speed: %u\n",
fwnode_get_name(sldr_node), val);
return -EINVAL;
}
if (reg_offset) {
sldr_setup[2] = val;
} else {
sldr_setup[2] &= ~IQS7222_SLDR_SETUP_2_TOP_SPEED_MASK;
sldr_setup[2] |= (val / 4);
}
} else if (error != -EINVAL) {
dev_err(&client->dev, "Failed to read %s top speed: %d\n",
fwnode_get_name(sldr_node), error);
return error;
}
error = fwnode_property_read_u32(sldr_node, "linux,axis", &val);
if (!error) {
u16 sldr_max = sldr_setup[3] - 1;
if (!reg_offset) {
sldr_max = sldr_setup[2];
sldr_max &= IQS7222_SLDR_SETUP_2_RES_MASK;
sldr_max >>= IQS7222_SLDR_SETUP_2_RES_SHIFT;
sldr_max = sldr_max * 16 - 1;
}
input_set_abs_params(iqs7222->keypad, val, 0, sldr_max, 0, 0);
iqs7222->sl_axis[sldr_index] = val;
} else if (error != -EINVAL) {
dev_err(&client->dev, "Failed to read %s axis: %d\n",
fwnode_get_name(sldr_node), error);
return error;
}
if (dev_desc->wheel_enable) {
sldr_setup[0] &= ~dev_desc->wheel_enable;
if (iqs7222->sl_axis[sldr_index] == ABS_WHEEL)
sldr_setup[0] |= dev_desc->wheel_enable;
}
/*
* The absence of a register offset makes it safe to assume the device
* supports gestures, each of which is first disabled until explicitly
* enabled.
*/
if (!reg_offset)
for (i = 0; i < ARRAY_SIZE(iqs7222_sl_events); i++)
sldr_setup[9] &= ~iqs7222_sl_events[i].enable;
for (i = 0; i < ARRAY_SIZE(iqs7222_sl_events); i++) {
const char *event_name = iqs7222_sl_events[i].name;
struct fwnode_handle *event_node;
enum iqs7222_reg_key_id reg_key;
event_node = fwnode_get_named_child_node(sldr_node, event_name);
if (!event_node)
continue;
/*
* Depending on the device, gestures are either offered using
* one of two timing resolutions, or are not supported at all.
*/
if (reg_offset)
reg_key = IQS7222_REG_KEY_RESERVED;
else if (dev_desc->legacy_gesture &&
iqs7222_sl_events[i].reg_key == IQS7222_REG_KEY_TAP)
reg_key = IQS7222_REG_KEY_TAP_LEGACY;
else if (dev_desc->legacy_gesture &&
iqs7222_sl_events[i].reg_key == IQS7222_REG_KEY_AXIAL)
reg_key = IQS7222_REG_KEY_AXIAL_LEGACY;
else
reg_key = iqs7222_sl_events[i].reg_key;
/*
* The press/release event does not expose a direct GPIO link,
* but one can be emulated by tying each of the participating
* channels to the same GPIO.
*/
error = iqs7222_parse_event(iqs7222, event_node, sldr_index,
IQS7222_REG_GRP_SLDR, reg_key,
i ? iqs7222_sl_events[i].enable
: sldr_setup[3 + reg_offset],
i ? 1568 + sldr_index * 30
: sldr_setup[4 + reg_offset],
NULL,
&iqs7222->sl_code[sldr_index][i]);
fwnode_handle_put(event_node);
if (error)
return error;
if (!reg_offset)
sldr_setup[9] |= iqs7222_sl_events[i].enable;
if (!dev_desc->event_offset)
continue;
/*
* The press/release event is determined based on whether the
* coordinate field reports 0xFFFF and solely relies on touch
* or proximity interrupts to be unmasked.
*/
if (i && !reg_offset)
*event_mask |= (IQS7222_EVENT_MASK_SLDR << sldr_index);
else if (sldr_setup[4 + reg_offset] == dev_desc->touch_link)
*event_mask |= IQS7222_EVENT_MASK_TOUCH;
else
*event_mask |= IQS7222_EVENT_MASK_PROX;
}
/*
* The following call handles a special pair of properties that shift
* to make room for a wheel enable control in the case of IQS7222C.
*/
return iqs7222_parse_props(iqs7222, sldr_node, sldr_index,
IQS7222_REG_GRP_SLDR,
dev_desc->wheel_enable ?
IQS7222_REG_KEY_WHEEL :
IQS7222_REG_KEY_NO_WHEEL);
}
static int iqs7222_parse_tpad(struct iqs7222_private *iqs7222,
struct fwnode_handle *tpad_node, int tpad_index)
{
const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc;
struct touchscreen_properties *prop = &iqs7222->prop;
struct i2c_client *client = iqs7222->client;
int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row;
int count, error, i;
u16 *event_mask = &iqs7222->sys_setup[dev_desc->event_offset];
u16 *tpad_setup = iqs7222->tpad_setup;
unsigned int chan_sel[12];
error = iqs7222_parse_props(iqs7222, tpad_node, tpad_index,
IQS7222_REG_GRP_TPAD,
IQS7222_REG_KEY_NONE);
if (error)
return error;
count = fwnode_property_count_u32(tpad_node, "azoteq,channel-select");
if (count < 0) {
dev_err(&client->dev, "Failed to count %s channels: %d\n",
fwnode_get_name(tpad_node), count);
return count;
} else if (!count || count > ARRAY_SIZE(chan_sel)) {
dev_err(&client->dev, "Invalid number of %s channels\n",
fwnode_get_name(tpad_node));
return -EINVAL;
}
error = fwnode_property_read_u32_array(tpad_node,
"azoteq,channel-select",
chan_sel, count);
if (error) {
dev_err(&client->dev, "Failed to read %s channels: %d\n",
fwnode_get_name(tpad_node), error);
return error;
}
tpad_setup[6] &= ~GENMASK(num_chan - 1, 0);
for (i = 0; i < ARRAY_SIZE(chan_sel); i++) {
tpad_setup[8 + i] = 0;
if (i >= count || chan_sel[i] == U8_MAX)
continue;
if (chan_sel[i] >= num_chan) {
dev_err(&client->dev, "Invalid %s channel: %u\n",
fwnode_get_name(tpad_node), chan_sel[i]);
return -EINVAL;
}
/*
* The following fields indicate which channels participate in
* the trackpad, as well as each channel's relative placement.
*/
tpad_setup[6] |= BIT(chan_sel[i]);
tpad_setup[8 + i] = chan_sel[i] * 34 + 1072;
}
tpad_setup[7] = dev_desc->touch_link;
if (fwnode_property_present(tpad_node, "azoteq,use-prox"))
tpad_setup[7] -= 2;
for (i = 0; i < ARRAY_SIZE(iqs7222_tp_events); i++)
tpad_setup[20] &= ~(iqs7222_tp_events[i].strict |
iqs7222_tp_events[i].enable);
for (i = 0; i < ARRAY_SIZE(iqs7222_tp_events); i++) {
const char *event_name = iqs7222_tp_events[i].name;
struct fwnode_handle *event_node;
event_node = fwnode_get_named_child_node(tpad_node, event_name);
if (!event_node)
continue;
if (fwnode_property_present(event_node,
"azoteq,gesture-angle-tighten"))
tpad_setup[20] |= iqs7222_tp_events[i].strict;
tpad_setup[20] |= iqs7222_tp_events[i].enable;
error = iqs7222_parse_event(iqs7222, event_node, tpad_index,
IQS7222_REG_GRP_TPAD,
iqs7222_tp_events[i].reg_key,
iqs7222_tp_events[i].link, 1566,
NULL,
&iqs7222->tp_code[i]);
fwnode_handle_put(event_node);
if (error)
return error;
if (!dev_desc->event_offset)
continue;
/*
* The press/release event is determined based on whether the
* coordinate fields report 0xFFFF and solely relies on touch
* or proximity interrupts to be unmasked.
*/
if (i)
*event_mask |= IQS7222_EVENT_MASK_TPAD;
else if (tpad_setup[7] == dev_desc->touch_link)
*event_mask |= IQS7222_EVENT_MASK_TOUCH;
else
*event_mask |= IQS7222_EVENT_MASK_PROX;
}
if (!iqs7222->tp_code[0])
return 0;
input_set_abs_params(iqs7222->keypad, ABS_X,
0, (tpad_setup[4] ? : 1) - 1, 0, 0);
input_set_abs_params(iqs7222->keypad, ABS_Y,
0, (tpad_setup[5] ? : 1) - 1, 0, 0);
touchscreen_parse_properties(iqs7222->keypad, false, prop);
if (prop->max_x >= U16_MAX || prop->max_y >= U16_MAX) {
dev_err(&client->dev, "Invalid trackpad size: %u*%u\n",
prop->max_x, prop->max_y);
return -EINVAL;
}
tpad_setup[4] = prop->max_x + 1;
tpad_setup[5] = prop->max_y + 1;
return 0;
}
static int (*iqs7222_parse_extra[IQS7222_NUM_REG_GRPS])
(struct iqs7222_private *iqs7222,
struct fwnode_handle *reg_grp_node,
int reg_grp_index) = {
[IQS7222_REG_GRP_CYCLE] = iqs7222_parse_cycle,
[IQS7222_REG_GRP_CHAN] = iqs7222_parse_chan,
[IQS7222_REG_GRP_SLDR] = iqs7222_parse_sldr,
[IQS7222_REG_GRP_TPAD] = iqs7222_parse_tpad,
};
static int iqs7222_parse_reg_grp(struct iqs7222_private *iqs7222,
enum iqs7222_reg_grp_id reg_grp,
int reg_grp_index)
{
struct i2c_client *client = iqs7222->client;
struct fwnode_handle *reg_grp_node;
int error;
if (iqs7222_reg_grp_names[reg_grp]) {
char reg_grp_name[16];
snprintf(reg_grp_name, sizeof(reg_grp_name),
iqs7222_reg_grp_names[reg_grp], reg_grp_index);
reg_grp_node = device_get_named_child_node(&client->dev,
reg_grp_name);
} else {
reg_grp_node = fwnode_handle_get(dev_fwnode(&client->dev));
}
if (!reg_grp_node)
return 0;
error = iqs7222_parse_props(iqs7222, reg_grp_node, reg_grp_index,
reg_grp, IQS7222_REG_KEY_NONE);
if (!error && iqs7222_parse_extra[reg_grp])
error = iqs7222_parse_extra[reg_grp](iqs7222, reg_grp_node,
reg_grp_index);
fwnode_handle_put(reg_grp_node);
return error;
}
static int iqs7222_parse_all(struct iqs7222_private *iqs7222)
{
const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc;
const struct iqs7222_reg_grp_desc *reg_grps = dev_desc->reg_grps;
u16 *sys_setup = iqs7222->sys_setup;
int error, i, j;
if (dev_desc->allow_offset)
sys_setup[dev_desc->allow_offset] = U16_MAX;
if (dev_desc->event_offset)
sys_setup[dev_desc->event_offset] = IQS7222_EVENT_MASK_ATI;
for (i = 0; i < reg_grps[IQS7222_REG_GRP_GPIO].num_row; i++) {
u16 *gpio_setup = iqs7222->gpio_setup[i];
gpio_setup[0] &= ~IQS7222_GPIO_SETUP_0_GPIO_EN;
gpio_setup[1] = 0;
gpio_setup[2] = 0;
if (reg_grps[IQS7222_REG_GRP_GPIO].num_row == 1)
continue;
/*
* The IQS7222C and IQS7222D expose multiple GPIO and must be
* informed as to which GPIO this group represents.
*/
for (j = 0; j < ARRAY_SIZE(iqs7222_gpio_links); j++)
gpio_setup[0] &= ~BIT(iqs7222_gpio_links[j]);
gpio_setup[0] |= BIT(iqs7222_gpio_links[i]);
}
for (i = 0; i < reg_grps[IQS7222_REG_GRP_CHAN].num_row; i++) {
u16 *chan_setup = iqs7222->chan_setup[i];
chan_setup[0] &= ~IQS7222_CHAN_SETUP_0_REF_MODE_MASK;
chan_setup[0] &= ~IQS7222_CHAN_SETUP_0_CHAN_EN;
chan_setup[5] = 0;
}
for (i = 0; i < reg_grps[IQS7222_REG_GRP_SLDR].num_row; i++) {
u16 *sldr_setup = iqs7222->sldr_setup[i];
sldr_setup[0] &= ~IQS7222_SLDR_SETUP_0_CHAN_CNT_MASK;
}
for (i = 0; i < IQS7222_NUM_REG_GRPS; i++) {
for (j = 0; j < reg_grps[i].num_row; j++) {
error = iqs7222_parse_reg_grp(iqs7222, i, j);
if (error)
return error;
}
}
return 0;
}
static int iqs7222_report(struct iqs7222_private *iqs7222)
{
const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc;
struct i2c_client *client = iqs7222->client;
int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row;
int num_stat = dev_desc->reg_grps[IQS7222_REG_GRP_STAT].num_col;
int error, i, j;
__le16 status[IQS7222_MAX_COLS_STAT];
error = iqs7222_read_burst(iqs7222, IQS7222_SYS_STATUS, status,
num_stat);
if (error)
return error;
if (le16_to_cpu(status[0]) & IQS7222_SYS_STATUS_RESET) {
dev_err(&client->dev, "Unexpected device reset\n");
return iqs7222_dev_init(iqs7222, WRITE);
}
if (le16_to_cpu(status[0]) & IQS7222_SYS_STATUS_ATI_ERROR) {
dev_err(&client->dev, "Unexpected ATI error\n");
return iqs7222_ati_trigger(iqs7222);
}
if (le16_to_cpu(status[0]) & IQS7222_SYS_STATUS_ATI_ACTIVE)
return 0;
for (i = 0; i < num_chan; i++) {
u16 *chan_setup = iqs7222->chan_setup[i];
if (!(chan_setup[0] & IQS7222_CHAN_SETUP_0_CHAN_EN))
continue;
for (j = 0; j < ARRAY_SIZE(iqs7222_kp_events); j++) {
/*
* Proximity state begins at offset 2 and spills into
* offset 3 for devices with more than 16 channels.
*
* Touch state begins at the first offset immediately
* following proximity state.
*/
int k = 2 + j * (num_chan > 16 ? 2 : 1);
u16 state = le16_to_cpu(status[k + i / 16]);
if (!iqs7222->kp_type[i][j])
continue;
input_event(iqs7222->keypad,
iqs7222->kp_type[i][j],
iqs7222->kp_code[i][j],
!!(state & BIT(i % 16)));
}
}
for (i = 0; i < dev_desc->reg_grps[IQS7222_REG_GRP_SLDR].num_row; i++) {
u16 *sldr_setup = iqs7222->sldr_setup[i];
u16 sldr_pos = le16_to_cpu(status[4 + i]);
u16 state = le16_to_cpu(status[6 + i]);
if (!(sldr_setup[0] & IQS7222_SLDR_SETUP_0_CHAN_CNT_MASK))
continue;
if (sldr_pos < dev_desc->sldr_res)
input_report_abs(iqs7222->keypad, iqs7222->sl_axis[i],
sldr_pos);
input_report_key(iqs7222->keypad, iqs7222->sl_code[i][0],
sldr_pos < dev_desc->sldr_res);
/*
* A maximum resolution indicates the device does not support
* gestures, in which case the remaining fields are ignored.
*/
if (dev_desc->sldr_res == U16_MAX)
continue;
if (!(le16_to_cpu(status[1]) & IQS7222_EVENT_MASK_SLDR << i))
continue;
/*
* Skip the press/release event, as it does not have separate
* status fields and is handled separately.
*/
for (j = 1; j < ARRAY_SIZE(iqs7222_sl_events); j++) {
u16 mask = iqs7222_sl_events[j].mask;
u16 val = iqs7222_sl_events[j].val;
input_report_key(iqs7222->keypad,
iqs7222->sl_code[i][j],
(state & mask) == val);
}
input_sync(iqs7222->keypad);
for (j = 1; j < ARRAY_SIZE(iqs7222_sl_events); j++)
input_report_key(iqs7222->keypad,
iqs7222->sl_code[i][j], 0);
}
for (i = 0; i < dev_desc->reg_grps[IQS7222_REG_GRP_TPAD].num_row; i++) {
u16 tpad_pos_x = le16_to_cpu(status[4]);
u16 tpad_pos_y = le16_to_cpu(status[5]);
u16 state = le16_to_cpu(status[6]);
input_report_key(iqs7222->keypad, iqs7222->tp_code[0],
tpad_pos_x < U16_MAX);
if (tpad_pos_x < U16_MAX)
touchscreen_report_pos(iqs7222->keypad, &iqs7222->prop,
tpad_pos_x, tpad_pos_y, false);
if (!(le16_to_cpu(status[1]) & IQS7222_EVENT_MASK_TPAD))
continue;
/*
* Skip the press/release event, as it does not have separate
* status fields and is handled separately.
*/
for (j = 1; j < ARRAY_SIZE(iqs7222_tp_events); j++) {
u16 mask = iqs7222_tp_events[j].mask;
u16 val = iqs7222_tp_events[j].val;
input_report_key(iqs7222->keypad,
iqs7222->tp_code[j],
(state & mask) == val);
}
input_sync(iqs7222->keypad);
for (j = 1; j < ARRAY_SIZE(iqs7222_tp_events); j++)
input_report_key(iqs7222->keypad,
iqs7222->tp_code[j], 0);
}
input_sync(iqs7222->keypad);
return 0;
}
static irqreturn_t iqs7222_irq(int irq, void *context)
{
struct iqs7222_private *iqs7222 = context;
return iqs7222_report(iqs7222) ? IRQ_NONE : IRQ_HANDLED;
}
static int iqs7222_probe(struct i2c_client *client)
{
struct iqs7222_private *iqs7222;
unsigned long irq_flags;
int error, irq;
iqs7222 = devm_kzalloc(&client->dev, sizeof(*iqs7222), GFP_KERNEL);
if (!iqs7222)
return -ENOMEM;
i2c_set_clientdata(client, iqs7222);
iqs7222->client = client;
iqs7222->keypad = devm_input_allocate_device(&client->dev);
if (!iqs7222->keypad)
return -ENOMEM;
iqs7222->keypad->name = client->name;
iqs7222->keypad->id.bustype = BUS_I2C;
/*
* The RDY pin behaves as an interrupt, but must also be polled ahead
* of unsolicited I2C communication. As such, it is first opened as a
* GPIO and then passed to gpiod_to_irq() to register the interrupt.
*/
iqs7222->irq_gpio = devm_gpiod_get(&client->dev, "irq", GPIOD_IN);
if (IS_ERR(iqs7222->irq_gpio)) {
error = PTR_ERR(iqs7222->irq_gpio);
dev_err(&client->dev, "Failed to request IRQ GPIO: %d\n",
error);
return error;
}
iqs7222->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(iqs7222->reset_gpio)) {
error = PTR_ERR(iqs7222->reset_gpio);
dev_err(&client->dev, "Failed to request reset GPIO: %d\n",
error);
return error;
}
error = iqs7222_hard_reset(iqs7222);
if (error)
return error;
error = iqs7222_dev_info(iqs7222);
if (error)
return error;
error = iqs7222_dev_init(iqs7222, READ);
if (error)
return error;
error = iqs7222_parse_all(iqs7222);
if (error)
return error;
error = iqs7222_dev_init(iqs7222, WRITE);
if (error)
return error;
error = iqs7222_report(iqs7222);
if (error)
return error;
error = input_register_device(iqs7222->keypad);
if (error) {
dev_err(&client->dev, "Failed to register device: %d\n", error);
return error;
}
irq = gpiod_to_irq(iqs7222->irq_gpio);
if (irq < 0)
return irq;
irq_flags = gpiod_is_active_low(iqs7222->irq_gpio) ? IRQF_TRIGGER_LOW
: IRQF_TRIGGER_HIGH;
irq_flags |= IRQF_ONESHOT;
error = devm_request_threaded_irq(&client->dev, irq, NULL, iqs7222_irq,
irq_flags, client->name, iqs7222);
if (error)
dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
return error;
}
static const struct of_device_id iqs7222_of_match[] = {
{ .compatible = "azoteq,iqs7222a" },
{ .compatible = "azoteq,iqs7222b" },
{ .compatible = "azoteq,iqs7222c" },
{ .compatible = "azoteq,iqs7222d" },
{ }
};
MODULE_DEVICE_TABLE(of, iqs7222_of_match);
static struct i2c_driver iqs7222_i2c_driver = {
.driver = {
.name = "iqs7222",
.of_match_table = iqs7222_of_match,
},
.probe = iqs7222_probe,
};
module_i2c_driver(iqs7222_i2c_driver);
MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
MODULE_DESCRIPTION("Azoteq IQS7222A/B/C/D Capacitive Touch Controller");
MODULE_LICENSE("GPL");
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