// SPDX-License-Identifier: GPL-2.0+
/*
* Azoteq IQS269A Capacitive Touch Controller
*
* Copyright (C) 2020 Jeff LaBundy <[email protected]>
*
* This driver registers up to 3 input devices: one representing capacitive or
* inductive keys as well as Hall-effect switches, and one for each of the two
* axial sliders presented by the device.
*/
#include <linux/bits.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define IQS269_VER_INFO 0x00
#define IQS269_VER_INFO_PROD_NUM 0x4F
#define IQS269_VER_INFO_FW_NUM_2 0x03
#define IQS269_VER_INFO_FW_NUM_3 0x10
#define IQS269_SYS_FLAGS 0x02
#define IQS269_SYS_FLAGS_SHOW_RESET BIT(15)
#define IQS269_SYS_FLAGS_PWR_MODE_MASK GENMASK(12, 11)
#define IQS269_SYS_FLAGS_PWR_MODE_SHIFT 11
#define IQS269_SYS_FLAGS_IN_ATI BIT(10)
#define IQS269_CHx_COUNTS 0x08
#define IQS269_SLIDER_X 0x30
#define IQS269_CAL_DATA_A 0x35
#define IQS269_CAL_DATA_A_HALL_BIN_L_MASK GENMASK(15, 12)
#define IQS269_CAL_DATA_A_HALL_BIN_L_SHIFT 12
#define IQS269_CAL_DATA_A_HALL_BIN_R_MASK GENMASK(11, 8)
#define IQS269_CAL_DATA_A_HALL_BIN_R_SHIFT 8
#define IQS269_SYS_SETTINGS 0x80
#define IQS269_SYS_SETTINGS_CLK_DIV BIT(15)
#define IQS269_SYS_SETTINGS_ULP_AUTO BIT(14)
#define IQS269_SYS_SETTINGS_DIS_AUTO BIT(13)
#define IQS269_SYS_SETTINGS_PWR_MODE_MASK GENMASK(12, 11)
#define IQS269_SYS_SETTINGS_PWR_MODE_SHIFT 11
#define IQS269_SYS_SETTINGS_PWR_MODE_MAX 3
#define IQS269_SYS_SETTINGS_ULP_UPDATE_MASK GENMASK(10, 8)
#define IQS269_SYS_SETTINGS_ULP_UPDATE_SHIFT 8
#define IQS269_SYS_SETTINGS_ULP_UPDATE_MAX 7
#define IQS269_SYS_SETTINGS_SLIDER_SWIPE BIT(7)
#define IQS269_SYS_SETTINGS_RESEED_OFFSET BIT(6)
#define IQS269_SYS_SETTINGS_EVENT_MODE BIT(5)
#define IQS269_SYS_SETTINGS_EVENT_MODE_LP BIT(4)
#define IQS269_SYS_SETTINGS_REDO_ATI BIT(2)
#define IQS269_SYS_SETTINGS_ACK_RESET BIT(0)
#define IQS269_FILT_STR_LP_LTA_MASK GENMASK(7, 6)
#define IQS269_FILT_STR_LP_LTA_SHIFT 6
#define IQS269_FILT_STR_LP_CNT_MASK GENMASK(5, 4)
#define IQS269_FILT_STR_LP_CNT_SHIFT 4
#define IQS269_FILT_STR_NP_LTA_MASK GENMASK(3, 2)
#define IQS269_FILT_STR_NP_LTA_SHIFT 2
#define IQS269_FILT_STR_NP_CNT_MASK GENMASK(1, 0)
#define IQS269_FILT_STR_MAX 3
#define IQS269_EVENT_MASK_SYS BIT(6)
#define IQS269_EVENT_MASK_GESTURE BIT(3)
#define IQS269_EVENT_MASK_DEEP BIT(2)
#define IQS269_EVENT_MASK_TOUCH BIT(1)
#define IQS269_EVENT_MASK_PROX BIT(0)
#define IQS269_RATE_NP_MS_MAX 255
#define IQS269_RATE_LP_MS_MAX 255
#define IQS269_RATE_ULP_MS_MAX 4080
#define IQS269_TIMEOUT_PWR_MS_MAX 130560
#define IQS269_TIMEOUT_LTA_MS_MAX 130560
#define IQS269_MISC_A_ATI_BAND_DISABLE BIT(15)
#define IQS269_MISC_A_ATI_LP_ONLY BIT(14)
#define IQS269_MISC_A_ATI_BAND_TIGHTEN BIT(13)
#define IQS269_MISC_A_FILT_DISABLE BIT(12)
#define IQS269_MISC_A_GPIO3_SELECT_MASK GENMASK(10, 8)
#define IQS269_MISC_A_GPIO3_SELECT_SHIFT 8
#define IQS269_MISC_A_DUAL_DIR BIT(6)
#define IQS269_MISC_A_TX_FREQ_MASK GENMASK(5, 4)
#define IQS269_MISC_A_TX_FREQ_SHIFT 4
#define IQS269_MISC_A_TX_FREQ_MAX 3
#define IQS269_MISC_A_GLOBAL_CAP_SIZE BIT(0)
#define IQS269_MISC_B_RESEED_UI_SEL_MASK GENMASK(7, 6)
#define IQS269_MISC_B_RESEED_UI_SEL_SHIFT 6
#define IQS269_MISC_B_RESEED_UI_SEL_MAX 3
#define IQS269_MISC_B_TRACKING_UI_ENABLE BIT(4)
#define IQS269_MISC_B_FILT_STR_SLIDER GENMASK(1, 0)
#define IQS269_TOUCH_HOLD_SLIDER_SEL 0x89
#define IQS269_TOUCH_HOLD_DEFAULT 0x14
#define IQS269_TOUCH_HOLD_MS_MIN 256
#define IQS269_TOUCH_HOLD_MS_MAX 65280
#define IQS269_TIMEOUT_TAP_MS_MAX 4080
#define IQS269_TIMEOUT_SWIPE_MS_MAX 4080
#define IQS269_THRESH_SWIPE_MAX 255
#define IQS269_CHx_ENG_A_MEAS_CAP_SIZE BIT(15)
#define IQS269_CHx_ENG_A_RX_GND_INACTIVE BIT(13)
#define IQS269_CHx_ENG_A_LOCAL_CAP_SIZE BIT(12)
#define IQS269_CHx_ENG_A_ATI_MODE_MASK GENMASK(9, 8)
#define IQS269_CHx_ENG_A_ATI_MODE_SHIFT 8
#define IQS269_CHx_ENG_A_ATI_MODE_MAX 3
#define IQS269_CHx_ENG_A_INV_LOGIC BIT(7)
#define IQS269_CHx_ENG_A_PROJ_BIAS_MASK GENMASK(6, 5)
#define IQS269_CHx_ENG_A_PROJ_BIAS_SHIFT 5
#define IQS269_CHx_ENG_A_PROJ_BIAS_MAX 3
#define IQS269_CHx_ENG_A_SENSE_MODE_MASK GENMASK(3, 0)
#define IQS269_CHx_ENG_A_SENSE_MODE_MAX 15
#define IQS269_CHx_ENG_B_LOCAL_CAP_ENABLE BIT(13)
#define IQS269_CHx_ENG_B_SENSE_FREQ_MASK GENMASK(10, 9)
#define IQS269_CHx_ENG_B_SENSE_FREQ_SHIFT 9
#define IQS269_CHx_ENG_B_SENSE_FREQ_MAX 3
#define IQS269_CHx_ENG_B_STATIC_ENABLE BIT(8)
#define IQS269_CHx_ENG_B_ATI_BASE_MASK GENMASK(7, 6)
#define IQS269_CHx_ENG_B_ATI_BASE_75 0x00
#define IQS269_CHx_ENG_B_ATI_BASE_100 0x40
#define IQS269_CHx_ENG_B_ATI_BASE_150 0x80
#define IQS269_CHx_ENG_B_ATI_BASE_200 0xC0
#define IQS269_CHx_ENG_B_ATI_TARGET_MASK GENMASK(5, 0)
#define IQS269_CHx_ENG_B_ATI_TARGET_MAX 2016
#define IQS269_CHx_WEIGHT_MAX 255
#define IQS269_CHx_THRESH_MAX 255
#define IQS269_CHx_HYST_DEEP_MASK GENMASK(7, 4)
#define IQS269_CHx_HYST_DEEP_SHIFT 4
#define IQS269_CHx_HYST_TOUCH_MASK GENMASK(3, 0)
#define IQS269_CHx_HYST_MAX 15
#define IQS269_CHx_HALL_INACTIVE 6
#define IQS269_CHx_HALL_ACTIVE 7
#define IQS269_HALL_PAD_R BIT(0)
#define IQS269_HALL_PAD_L BIT(1)
#define IQS269_HALL_PAD_INV BIT(6)
#define IQS269_HALL_UI 0xF5
#define IQS269_HALL_UI_ENABLE BIT(15)
#define IQS269_MAX_REG 0xFF
#define IQS269_OTP_OPTION_DEFAULT 0x00
#define IQS269_OTP_OPTION_TWS 0xD0
#define IQS269_OTP_OPTION_HOLD BIT(7)
#define IQS269_NUM_CH 8
#define IQS269_NUM_SL 2
#define iqs269_irq_wait() usleep_range(200, 250)
enum iqs269_local_cap_size {
IQS269_LOCAL_CAP_SIZE_0,
IQS269_LOCAL_CAP_SIZE_GLOBAL_ONLY,
IQS269_LOCAL_CAP_SIZE_GLOBAL_0pF5,
};
enum iqs269_st_offs {
IQS269_ST_OFFS_PROX,
IQS269_ST_OFFS_DIR,
IQS269_ST_OFFS_TOUCH,
IQS269_ST_OFFS_DEEP,
};
enum iqs269_th_offs {
IQS269_TH_OFFS_PROX,
IQS269_TH_OFFS_TOUCH,
IQS269_TH_OFFS_DEEP,
};
enum iqs269_event_id {
IQS269_EVENT_PROX_DN,
IQS269_EVENT_PROX_UP,
IQS269_EVENT_TOUCH_DN,
IQS269_EVENT_TOUCH_UP,
IQS269_EVENT_DEEP_DN,
IQS269_EVENT_DEEP_UP,
};
enum iqs269_slider_id {
IQS269_SLIDER_NONE,
IQS269_SLIDER_KEY,
IQS269_SLIDER_RAW,
};
enum iqs269_gesture_id {
IQS269_GESTURE_TAP,
IQS269_GESTURE_HOLD,
IQS269_GESTURE_FLICK_POS,
IQS269_GESTURE_FLICK_NEG,
IQS269_NUM_GESTURES,
};
struct iqs269_switch_desc {
unsigned int code;
bool enabled;
};
struct iqs269_event_desc {
const char *name;
enum iqs269_st_offs st_offs;
enum iqs269_th_offs th_offs;
bool dir_up;
u8 mask;
};
static const struct iqs269_event_desc iqs269_events[] = {
[IQS269_EVENT_PROX_DN] = {
.name = "event-prox",
.st_offs = IQS269_ST_OFFS_PROX,
.th_offs = IQS269_TH_OFFS_PROX,
.mask = IQS269_EVENT_MASK_PROX,
},
[IQS269_EVENT_PROX_UP] = {
.name = "event-prox-alt",
.st_offs = IQS269_ST_OFFS_PROX,
.th_offs = IQS269_TH_OFFS_PROX,
.dir_up = true,
.mask = IQS269_EVENT_MASK_PROX,
},
[IQS269_EVENT_TOUCH_DN] = {
.name = "event-touch",
.st_offs = IQS269_ST_OFFS_TOUCH,
.th_offs = IQS269_TH_OFFS_TOUCH,
.mask = IQS269_EVENT_MASK_TOUCH,
},
[IQS269_EVENT_TOUCH_UP] = {
.name = "event-touch-alt",
.st_offs = IQS269_ST_OFFS_TOUCH,
.th_offs = IQS269_TH_OFFS_TOUCH,
.dir_up = true,
.mask = IQS269_EVENT_MASK_TOUCH,
},
[IQS269_EVENT_DEEP_DN] = {
.name = "event-deep",
.st_offs = IQS269_ST_OFFS_DEEP,
.th_offs = IQS269_TH_OFFS_DEEP,
.mask = IQS269_EVENT_MASK_DEEP,
},
[IQS269_EVENT_DEEP_UP] = {
.name = "event-deep-alt",
.st_offs = IQS269_ST_OFFS_DEEP,
.th_offs = IQS269_TH_OFFS_DEEP,
.dir_up = true,
.mask = IQS269_EVENT_MASK_DEEP,
},
};
struct iqs269_ver_info {
u8 prod_num;
u8 sw_num;
u8 hw_num;
u8 fw_num;
} __packed;
struct iqs269_ch_reg {
u8 rx_enable;
u8 tx_enable;
__be16 engine_a;
__be16 engine_b;
__be16 ati_comp;
u8 thresh[3];
u8 hyst;
u8 assoc_select;
u8 assoc_weight;
} __packed;
struct iqs269_sys_reg {
__be16 general;
u8 active;
u8 filter;
u8 reseed;
u8 event_mask;
u8 rate_np;
u8 rate_lp;
u8 rate_ulp;
u8 timeout_pwr;
u8 timeout_rdy;
u8 timeout_lta;
__be16 misc_a;
__be16 misc_b;
u8 blocking;
u8 padding;
u8 slider_select[IQS269_NUM_SL];
u8 timeout_tap;
u8 timeout_swipe;
u8 thresh_swipe;
u8 redo_ati;
struct iqs269_ch_reg ch_reg[IQS269_NUM_CH];
} __packed;
struct iqs269_flags {
__be16 system;
u8 gesture;
u8 padding;
u8 states[4];
} __packed;
struct iqs269_private {
struct i2c_client *client;
struct regmap *regmap;
struct mutex lock;
struct iqs269_switch_desc switches[ARRAY_SIZE(iqs269_events)];
struct iqs269_ver_info ver_info;
struct iqs269_sys_reg sys_reg;
struct completion ati_done;
struct input_dev *keypad;
struct input_dev *slider[IQS269_NUM_SL];
unsigned int keycode[ARRAY_SIZE(iqs269_events) * IQS269_NUM_CH];
unsigned int sl_code[IQS269_NUM_SL][IQS269_NUM_GESTURES];
unsigned int otp_option;
unsigned int ch_num;
bool hall_enable;
bool ati_current;
};
static enum iqs269_slider_id iqs269_slider_type(struct iqs269_private *iqs269,
int slider_num)
{
int i;
/*
* Slider 1 is unavailable if the touch-and-hold option is enabled via
* OTP. In that case, the channel selection register is repurposed for
* the touch-and-hold timer ceiling.
*/
if (slider_num && (iqs269->otp_option & IQS269_OTP_OPTION_HOLD))
return IQS269_SLIDER_NONE;
if (!iqs269->sys_reg.slider_select[slider_num])
return IQS269_SLIDER_NONE;
for (i = 0; i < IQS269_NUM_GESTURES; i++)
if (iqs269->sl_code[slider_num][i] != KEY_RESERVED)
return IQS269_SLIDER_KEY;
return IQS269_SLIDER_RAW;
}
static int iqs269_ati_mode_set(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int mode)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_a;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
if (mode > IQS269_CHx_ENG_A_ATI_MODE_MAX)
return -EINVAL;
mutex_lock(&iqs269->lock);
engine_a = be16_to_cpu(ch_reg[ch_num].engine_a);
engine_a &= ~IQS269_CHx_ENG_A_ATI_MODE_MASK;
engine_a |= (mode << IQS269_CHx_ENG_A_ATI_MODE_SHIFT);
ch_reg[ch_num].engine_a = cpu_to_be16(engine_a);
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
return 0;
}
static int iqs269_ati_mode_get(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int *mode)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_a;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
mutex_lock(&iqs269->lock);
engine_a = be16_to_cpu(ch_reg[ch_num].engine_a);
mutex_unlock(&iqs269->lock);
engine_a &= IQS269_CHx_ENG_A_ATI_MODE_MASK;
*mode = (engine_a >> IQS269_CHx_ENG_A_ATI_MODE_SHIFT);
return 0;
}
static int iqs269_ati_base_set(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int base)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_b;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
switch (base) {
case 75:
base = IQS269_CHx_ENG_B_ATI_BASE_75;
break;
case 100:
base = IQS269_CHx_ENG_B_ATI_BASE_100;
break;
case 150:
base = IQS269_CHx_ENG_B_ATI_BASE_150;
break;
case 200:
base = IQS269_CHx_ENG_B_ATI_BASE_200;
break;
default:
return -EINVAL;
}
mutex_lock(&iqs269->lock);
engine_b = be16_to_cpu(ch_reg[ch_num].engine_b);
engine_b &= ~IQS269_CHx_ENG_B_ATI_BASE_MASK;
engine_b |= base;
ch_reg[ch_num].engine_b = cpu_to_be16(engine_b);
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
return 0;
}
static int iqs269_ati_base_get(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int *base)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_b;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
mutex_lock(&iqs269->lock);
engine_b = be16_to_cpu(ch_reg[ch_num].engine_b);
mutex_unlock(&iqs269->lock);
switch (engine_b & IQS269_CHx_ENG_B_ATI_BASE_MASK) {
case IQS269_CHx_ENG_B_ATI_BASE_75:
*base = 75;
return 0;
case IQS269_CHx_ENG_B_ATI_BASE_100:
*base = 100;
return 0;
case IQS269_CHx_ENG_B_ATI_BASE_150:
*base = 150;
return 0;
case IQS269_CHx_ENG_B_ATI_BASE_200:
*base = 200;
return 0;
default:
return -EINVAL;
}
}
static int iqs269_ati_target_set(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int target)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_b;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
if (target > IQS269_CHx_ENG_B_ATI_TARGET_MAX)
return -EINVAL;
mutex_lock(&iqs269->lock);
engine_b = be16_to_cpu(ch_reg[ch_num].engine_b);
engine_b &= ~IQS269_CHx_ENG_B_ATI_TARGET_MASK;
engine_b |= target / 32;
ch_reg[ch_num].engine_b = cpu_to_be16(engine_b);
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
return 0;
}
static int iqs269_ati_target_get(struct iqs269_private *iqs269,
unsigned int ch_num, unsigned int *target)
{
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
u16 engine_b;
if (ch_num >= IQS269_NUM_CH)
return -EINVAL;
mutex_lock(&iqs269->lock);
engine_b = be16_to_cpu(ch_reg[ch_num].engine_b);
mutex_unlock(&iqs269->lock);
*target = (engine_b & IQS269_CHx_ENG_B_ATI_TARGET_MASK) * 32;
return 0;
}
static int iqs269_parse_mask(const struct fwnode_handle *fwnode,
const char *propname, u8 *mask)
{
unsigned int val[IQS269_NUM_CH];
int count, error, i;
count = fwnode_property_count_u32(fwnode, propname);
if (count < 0)
return 0;
if (count > IQS269_NUM_CH)
return -EINVAL;
error = fwnode_property_read_u32_array(fwnode, propname, val, count);
if (error)
return error;
*mask = 0;
for (i = 0; i < count; i++) {
if (val[i] >= IQS269_NUM_CH)
return -EINVAL;
*mask |= BIT(val[i]);
}
return 0;
}
static int iqs269_parse_chan(struct iqs269_private *iqs269,
const struct fwnode_handle *ch_node)
{
struct i2c_client *client = iqs269->client;
struct fwnode_handle *ev_node;
struct iqs269_ch_reg *ch_reg;
u16 engine_a, engine_b;
unsigned int reg, val;
int error, i;
error = fwnode_property_read_u32(ch_node, "reg", ®);
if (error) {
dev_err(&client->dev, "Failed to read channel number: %d\n",
error);
return error;
} else if (reg >= IQS269_NUM_CH) {
dev_err(&client->dev, "Invalid channel number: %u\n", reg);
return -EINVAL;
}
iqs269->sys_reg.active |= BIT(reg);
if (!fwnode_property_present(ch_node, "azoteq,reseed-disable"))
iqs269->sys_reg.reseed |= BIT(reg);
if (fwnode_property_present(ch_node, "azoteq,blocking-enable"))
iqs269->sys_reg.blocking |= BIT(reg);
if (fwnode_property_present(ch_node, "azoteq,slider0-select"))
iqs269->sys_reg.slider_select[0] |= BIT(reg);
if (fwnode_property_present(ch_node, "azoteq,slider1-select") &&
!(iqs269->otp_option & IQS269_OTP_OPTION_HOLD))
iqs269->sys_reg.slider_select[1] |= BIT(reg);
ch_reg = &iqs269->sys_reg.ch_reg[reg];
error = iqs269_parse_mask(ch_node, "azoteq,rx-enable",
&ch_reg->rx_enable);
if (error) {
dev_err(&client->dev, "Invalid channel %u RX enable mask: %d\n",
reg, error);
return error;
}
error = iqs269_parse_mask(ch_node, "azoteq,tx-enable",
&ch_reg->tx_enable);
if (error) {
dev_err(&client->dev, "Invalid channel %u TX enable mask: %d\n",
reg, error);
return error;
}
engine_a = be16_to_cpu(ch_reg->engine_a);
engine_b = be16_to_cpu(ch_reg->engine_b);
engine_a |= IQS269_CHx_ENG_A_MEAS_CAP_SIZE;
if (fwnode_property_present(ch_node, "azoteq,meas-cap-decrease"))
engine_a &= ~IQS269_CHx_ENG_A_MEAS_CAP_SIZE;
engine_a |= IQS269_CHx_ENG_A_RX_GND_INACTIVE;
if (fwnode_property_present(ch_node, "azoteq,rx-float-inactive"))
engine_a &= ~IQS269_CHx_ENG_A_RX_GND_INACTIVE;
engine_a &= ~IQS269_CHx_ENG_A_LOCAL_CAP_SIZE;
engine_b &= ~IQS269_CHx_ENG_B_LOCAL_CAP_ENABLE;
if (!fwnode_property_read_u32(ch_node, "azoteq,local-cap-size", &val)) {
switch (val) {
case IQS269_LOCAL_CAP_SIZE_0:
break;
case IQS269_LOCAL_CAP_SIZE_GLOBAL_0pF5:
engine_a |= IQS269_CHx_ENG_A_LOCAL_CAP_SIZE;
fallthrough;
case IQS269_LOCAL_CAP_SIZE_GLOBAL_ONLY:
engine_b |= IQS269_CHx_ENG_B_LOCAL_CAP_ENABLE;
break;
default:
dev_err(&client->dev,
"Invalid channel %u local cap. size: %u\n", reg,
val);
return -EINVAL;
}
}
engine_a &= ~IQS269_CHx_ENG_A_INV_LOGIC;
if (fwnode_property_present(ch_node, "azoteq,invert-enable"))
engine_a |= IQS269_CHx_ENG_A_INV_LOGIC;
if (!fwnode_property_read_u32(ch_node, "azoteq,proj-bias", &val)) {
if (val > IQS269_CHx_ENG_A_PROJ_BIAS_MAX) {
dev_err(&client->dev,
"Invalid channel %u bias current: %u\n", reg,
val);
return -EINVAL;
}
engine_a &= ~IQS269_CHx_ENG_A_PROJ_BIAS_MASK;
engine_a |= (val << IQS269_CHx_ENG_A_PROJ_BIAS_SHIFT);
}
if (!fwnode_property_read_u32(ch_node, "azoteq,sense-mode", &val)) {
if (val > IQS269_CHx_ENG_A_SENSE_MODE_MAX) {
dev_err(&client->dev,
"Invalid channel %u sensing mode: %u\n", reg,
val);
return -EINVAL;
}
engine_a &= ~IQS269_CHx_ENG_A_SENSE_MODE_MASK;
engine_a |= val;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,sense-freq", &val)) {
if (val > IQS269_CHx_ENG_B_SENSE_FREQ_MAX) {
dev_err(&client->dev,
"Invalid channel %u sensing frequency: %u\n",
reg, val);
return -EINVAL;
}
engine_b &= ~IQS269_CHx_ENG_B_SENSE_FREQ_MASK;
engine_b |= (val << IQS269_CHx_ENG_B_SENSE_FREQ_SHIFT);
}
engine_b &= ~IQS269_CHx_ENG_B_STATIC_ENABLE;
if (fwnode_property_present(ch_node, "azoteq,static-enable"))
engine_b |= IQS269_CHx_ENG_B_STATIC_ENABLE;
ch_reg->engine_a = cpu_to_be16(engine_a);
ch_reg->engine_b = cpu_to_be16(engine_b);
if (!fwnode_property_read_u32(ch_node, "azoteq,ati-mode", &val)) {
error = iqs269_ati_mode_set(iqs269, reg, val);
if (error) {
dev_err(&client->dev,
"Invalid channel %u ATI mode: %u\n", reg, val);
return error;
}
}
if (!fwnode_property_read_u32(ch_node, "azoteq,ati-base", &val)) {
error = iqs269_ati_base_set(iqs269, reg, val);
if (error) {
dev_err(&client->dev,
"Invalid channel %u ATI base: %u\n", reg, val);
return error;
}
}
if (!fwnode_property_read_u32(ch_node, "azoteq,ati-target", &val)) {
error = iqs269_ati_target_set(iqs269, reg, val);
if (error) {
dev_err(&client->dev,
"Invalid channel %u ATI target: %u\n", reg,
val);
return error;
}
}
error = iqs269_parse_mask(ch_node, "azoteq,assoc-select",
&ch_reg->assoc_select);
if (error) {
dev_err(&client->dev, "Invalid channel %u association: %d\n",
reg, error);
return error;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,assoc-weight", &val)) {
if (val > IQS269_CHx_WEIGHT_MAX) {
dev_err(&client->dev,
"Invalid channel %u associated weight: %u\n",
reg, val);
return -EINVAL;
}
ch_reg->assoc_weight = val;
}
for (i = 0; i < ARRAY_SIZE(iqs269_events); i++) {
ev_node = fwnode_get_named_child_node(ch_node,
iqs269_events[i].name);
if (!ev_node)
continue;
if (!fwnode_property_read_u32(ev_node, "azoteq,thresh", &val)) {
if (val > IQS269_CHx_THRESH_MAX) {
dev_err(&client->dev,
"Invalid channel %u threshold: %u\n",
reg, val);
fwnode_handle_put(ev_node);
return -EINVAL;
}
ch_reg->thresh[iqs269_events[i].th_offs] = val;
}
if (!fwnode_property_read_u32(ev_node, "azoteq,hyst", &val)) {
u8 *hyst = &ch_reg->hyst;
if (val > IQS269_CHx_HYST_MAX) {
dev_err(&client->dev,
"Invalid channel %u hysteresis: %u\n",
reg, val);
fwnode_handle_put(ev_node);
return -EINVAL;
}
if (i == IQS269_EVENT_DEEP_DN ||
i == IQS269_EVENT_DEEP_UP) {
*hyst &= ~IQS269_CHx_HYST_DEEP_MASK;
*hyst |= (val << IQS269_CHx_HYST_DEEP_SHIFT);
} else if (i == IQS269_EVENT_TOUCH_DN ||
i == IQS269_EVENT_TOUCH_UP) {
*hyst &= ~IQS269_CHx_HYST_TOUCH_MASK;
*hyst |= val;
}
}
error = fwnode_property_read_u32(ev_node, "linux,code", &val);
fwnode_handle_put(ev_node);
if (error == -EINVAL) {
continue;
} else if (error) {
dev_err(&client->dev,
"Failed to read channel %u code: %d\n", reg,
error);
return error;
}
switch (reg) {
case IQS269_CHx_HALL_ACTIVE:
if (iqs269->hall_enable) {
iqs269->switches[i].code = val;
iqs269->switches[i].enabled = true;
}
fallthrough;
case IQS269_CHx_HALL_INACTIVE:
if (iqs269->hall_enable)
break;
fallthrough;
default:
iqs269->keycode[i * IQS269_NUM_CH + reg] = val;
}
iqs269->sys_reg.event_mask &= ~iqs269_events[i].mask;
}
return 0;
}
static int iqs269_parse_prop(struct iqs269_private *iqs269)
{
struct iqs269_sys_reg *sys_reg = &iqs269->sys_reg;
struct i2c_client *client = iqs269->client;
u16 general, misc_a, misc_b;
unsigned int val;
int error;
iqs269->hall_enable = device_property_present(&client->dev,
"azoteq,hall-enable");
error = regmap_raw_read(iqs269->regmap, IQS269_SYS_SETTINGS, sys_reg,
sizeof(*sys_reg));
if (error)
return error;
if (!device_property_read_u32(&client->dev, "azoteq,filt-str-lp-lta",
&val)) {
if (val > IQS269_FILT_STR_MAX) {
dev_err(&client->dev, "Invalid filter strength: %u\n",
val);
return -EINVAL;
}
sys_reg->filter &= ~IQS269_FILT_STR_LP_LTA_MASK;
sys_reg->filter |= (val << IQS269_FILT_STR_LP_LTA_SHIFT);
}
if (!device_property_read_u32(&client->dev, "azoteq,filt-str-lp-cnt",
&val)) {
if (val > IQS269_FILT_STR_MAX) {
dev_err(&client->dev, "Invalid filter strength: %u\n",
val);
return -EINVAL;
}
sys_reg->filter &= ~IQS269_FILT_STR_LP_CNT_MASK;
sys_reg->filter |= (val << IQS269_FILT_STR_LP_CNT_SHIFT);
}
if (!device_property_read_u32(&client->dev, "azoteq,filt-str-np-lta",
&val)) {
if (val > IQS269_FILT_STR_MAX) {
dev_err(&client->dev, "Invalid filter strength: %u\n",
val);
return -EINVAL;
}
sys_reg->filter &= ~IQS269_FILT_STR_NP_LTA_MASK;
sys_reg->filter |= (val << IQS269_FILT_STR_NP_LTA_SHIFT);
}
if (!device_property_read_u32(&client->dev, "azoteq,filt-str-np-cnt",
&val)) {
if (val > IQS269_FILT_STR_MAX) {
dev_err(&client->dev, "Invalid filter strength: %u\n",
val);
return -EINVAL;
}
sys_reg->filter &= ~IQS269_FILT_STR_NP_CNT_MASK;
sys_reg->filter |= val;
}
if (!device_property_read_u32(&client->dev, "azoteq,rate-np-ms",
&val)) {
if (val > IQS269_RATE_NP_MS_MAX) {
dev_err(&client->dev, "Invalid report rate: %u\n", val);
return -EINVAL;
}
sys_reg->rate_np = val;
}
if (!device_property_read_u32(&client->dev, "azoteq,rate-lp-ms",
&val)) {
if (val > IQS269_RATE_LP_MS_MAX) {
dev_err(&client->dev, "Invalid report rate: %u\n", val);
return -EINVAL;
}
sys_reg->rate_lp = val;
}
if (!device_property_read_u32(&client->dev, "azoteq,rate-ulp-ms",
&val)) {
if (val > IQS269_RATE_ULP_MS_MAX) {
dev_err(&client->dev, "Invalid report rate: %u\n", val);
return -EINVAL;
}
sys_reg->rate_ulp = val / 16;
}
if (!device_property_read_u32(&client->dev, "azoteq,timeout-pwr-ms",
&val)) {
if (val > IQS269_TIMEOUT_PWR_MS_MAX) {
dev_err(&client->dev, "Invalid timeout: %u\n", val);
return -EINVAL;
}
sys_reg->timeout_pwr = val / 512;
}
if (!device_property_read_u32(&client->dev, "azoteq,timeout-lta-ms",
&val)) {
if (val > IQS269_TIMEOUT_LTA_MS_MAX) {
dev_err(&client->dev, "Invalid timeout: %u\n", val);
return -EINVAL;
}
sys_reg->timeout_lta = val / 512;
}
misc_a = be16_to_cpu(sys_reg->misc_a);
misc_b = be16_to_cpu(sys_reg->misc_b);
misc_a &= ~IQS269_MISC_A_ATI_BAND_DISABLE;
if (device_property_present(&client->dev, "azoteq,ati-band-disable"))
misc_a |= IQS269_MISC_A_ATI_BAND_DISABLE;
misc_a &= ~IQS269_MISC_A_ATI_LP_ONLY;
if (device_property_present(&client->dev, "azoteq,ati-lp-only"))
misc_a |= IQS269_MISC_A_ATI_LP_ONLY;
misc_a &= ~IQS269_MISC_A_ATI_BAND_TIGHTEN;
if (device_property_present(&client->dev, "azoteq,ati-band-tighten"))
misc_a |= IQS269_MISC_A_ATI_BAND_TIGHTEN;
misc_a &= ~IQS269_MISC_A_FILT_DISABLE;
if (device_property_present(&client->dev, "azoteq,filt-disable"))
misc_a |= IQS269_MISC_A_FILT_DISABLE;
if (!device_property_read_u32(&client->dev, "azoteq,gpio3-select",
&val)) {
if (val >= IQS269_NUM_CH) {
dev_err(&client->dev, "Invalid GPIO3 selection: %u\n",
val);
return -EINVAL;
}
misc_a &= ~IQS269_MISC_A_GPIO3_SELECT_MASK;
misc_a |= (val << IQS269_MISC_A_GPIO3_SELECT_SHIFT);
}
misc_a &= ~IQS269_MISC_A_DUAL_DIR;
if (device_property_present(&client->dev, "azoteq,dual-direction"))
misc_a |= IQS269_MISC_A_DUAL_DIR;
if (!device_property_read_u32(&client->dev, "azoteq,tx-freq", &val)) {
if (val > IQS269_MISC_A_TX_FREQ_MAX) {
dev_err(&client->dev,
"Invalid excitation frequency: %u\n", val);
return -EINVAL;
}
misc_a &= ~IQS269_MISC_A_TX_FREQ_MASK;
misc_a |= (val << IQS269_MISC_A_TX_FREQ_SHIFT);
}
misc_a &= ~IQS269_MISC_A_GLOBAL_CAP_SIZE;
if (device_property_present(&client->dev, "azoteq,global-cap-increase"))
misc_a |= IQS269_MISC_A_GLOBAL_CAP_SIZE;
if (!device_property_read_u32(&client->dev, "azoteq,reseed-select",
&val)) {
if (val > IQS269_MISC_B_RESEED_UI_SEL_MAX) {
dev_err(&client->dev, "Invalid reseed selection: %u\n",
val);
return -EINVAL;
}
misc_b &= ~IQS269_MISC_B_RESEED_UI_SEL_MASK;
misc_b |= (val << IQS269_MISC_B_RESEED_UI_SEL_SHIFT);
}
misc_b &= ~IQS269_MISC_B_TRACKING_UI_ENABLE;
if (device_property_present(&client->dev, "azoteq,tracking-enable"))
misc_b |= IQS269_MISC_B_TRACKING_UI_ENABLE;
if (!device_property_read_u32(&client->dev, "azoteq,filt-str-slider",
&val)) {
if (val > IQS269_FILT_STR_MAX) {
dev_err(&client->dev, "Invalid filter strength: %u\n",
val);
return -EINVAL;
}
misc_b &= ~IQS269_MISC_B_FILT_STR_SLIDER;
misc_b |= val;
}
sys_reg->misc_a = cpu_to_be16(misc_a);
sys_reg->misc_b = cpu_to_be16(misc_b);
sys_reg->active = 0;
sys_reg->reseed = 0;
sys_reg->blocking = 0;
sys_reg->slider_select[0] = 0;
/*
* If configured via OTP to do so, the device asserts a pulse on the
* GPIO4 pin for approximately 60 ms once a selected channel is held
* in a state of touch for a configurable length of time.
*
* In that case, the register used for slider 1 channel selection is
* repurposed for the touch-and-hold timer ceiling.
*/
if (iqs269->otp_option & IQS269_OTP_OPTION_HOLD) {
if (!device_property_read_u32(&client->dev,
"azoteq,touch-hold-ms", &val)) {
if (val < IQS269_TOUCH_HOLD_MS_MIN ||
val > IQS269_TOUCH_HOLD_MS_MAX) {
dev_err(&client->dev,
"Invalid touch-and-hold ceiling: %u\n",
val);
return -EINVAL;
}
sys_reg->slider_select[1] = val / 256;
} else if (iqs269->ver_info.fw_num < IQS269_VER_INFO_FW_NUM_3) {
/*
* The default touch-and-hold timer ceiling initially
* read from early revisions of silicon is invalid if
* the device experienced a soft reset between power-
* on and the read operation.
*
* To protect against this case, explicitly cache the
* default value so that it is restored each time the
* device is re-initialized.
*/
sys_reg->slider_select[1] = IQS269_TOUCH_HOLD_DEFAULT;
}
} else {
sys_reg->slider_select[1] = 0;
}
sys_reg->event_mask = ~((u8)IQS269_EVENT_MASK_SYS);
device_for_each_child_node_scoped(&client->dev, ch_node) {
error = iqs269_parse_chan(iqs269, ch_node);
if (error)
return error;
}
/*
* Volunteer all active channels to participate in ATI when REDO-ATI is
* manually triggered.
*/
sys_reg->redo_ati = sys_reg->active;
general = be16_to_cpu(sys_reg->general);
if (device_property_present(&client->dev, "azoteq,clk-div"))
general |= IQS269_SYS_SETTINGS_CLK_DIV;
/*
* Configure the device to automatically switch between normal and low-
* power modes as a function of sensing activity. Ultra-low-power mode,
* if enabled, is reserved for suspend.
*/
general &= ~IQS269_SYS_SETTINGS_ULP_AUTO;
general &= ~IQS269_SYS_SETTINGS_DIS_AUTO;
general &= ~IQS269_SYS_SETTINGS_PWR_MODE_MASK;
if (!device_property_read_u32(&client->dev, "azoteq,suspend-mode",
&val)) {
if (val > IQS269_SYS_SETTINGS_PWR_MODE_MAX) {
dev_err(&client->dev, "Invalid suspend mode: %u\n",
val);
return -EINVAL;
}
general |= (val << IQS269_SYS_SETTINGS_PWR_MODE_SHIFT);
}
if (!device_property_read_u32(&client->dev, "azoteq,ulp-update",
&val)) {
if (val > IQS269_SYS_SETTINGS_ULP_UPDATE_MAX) {
dev_err(&client->dev, "Invalid update rate: %u\n", val);
return -EINVAL;
}
general &= ~IQS269_SYS_SETTINGS_ULP_UPDATE_MASK;
general |= (val << IQS269_SYS_SETTINGS_ULP_UPDATE_SHIFT);
}
if (device_property_present(&client->dev, "linux,keycodes")) {
int scale = 1;
int count = device_property_count_u32(&client->dev,
"linux,keycodes");
if (count > IQS269_NUM_GESTURES * IQS269_NUM_SL) {
dev_err(&client->dev, "Too many keycodes present\n");
return -EINVAL;
} else if (count < 0) {
dev_err(&client->dev, "Failed to count keycodes: %d\n",
count);
return count;
}
error = device_property_read_u32_array(&client->dev,
"linux,keycodes",
*iqs269->sl_code, count);
if (error) {
dev_err(&client->dev, "Failed to read keycodes: %d\n",
error);
return error;
}
if (device_property_present(&client->dev,
"azoteq,gesture-swipe"))
general |= IQS269_SYS_SETTINGS_SLIDER_SWIPE;
/*
* Early revisions of silicon use a more granular step size for
* tap and swipe gesture timeouts; scale them appropriately.
*/
if (iqs269->ver_info.fw_num < IQS269_VER_INFO_FW_NUM_3)
scale = 4;
if (!device_property_read_u32(&client->dev,
"azoteq,timeout-tap-ms", &val)) {
if (val > IQS269_TIMEOUT_TAP_MS_MAX / scale) {
dev_err(&client->dev, "Invalid timeout: %u\n",
val);
return -EINVAL;
}
sys_reg->timeout_tap = val / (16 / scale);
}
if (!device_property_read_u32(&client->dev,
"azoteq,timeout-swipe-ms",
&val)) {
if (val > IQS269_TIMEOUT_SWIPE_MS_MAX / scale) {
dev_err(&client->dev, "Invalid timeout: %u\n",
val);
return -EINVAL;
}
sys_reg->timeout_swipe = val / (16 / scale);
}
if (!device_property_read_u32(&client->dev,
"azoteq,thresh-swipe", &val)) {
if (val > IQS269_THRESH_SWIPE_MAX) {
dev_err(&client->dev, "Invalid threshold: %u\n",
val);
return -EINVAL;
}
sys_reg->thresh_swipe = val;
}
sys_reg->event_mask &= ~IQS269_EVENT_MASK_GESTURE;
}
general &= ~IQS269_SYS_SETTINGS_RESEED_OFFSET;
if (device_property_present(&client->dev, "azoteq,reseed-offset"))
general |= IQS269_SYS_SETTINGS_RESEED_OFFSET;
general |= IQS269_SYS_SETTINGS_EVENT_MODE;
/*
* As per the datasheet, enable streaming during normal-power mode if
* raw coordinates will be read from either slider. In that case, the
* device returns to event mode during low-power mode.
*/
if (iqs269_slider_type(iqs269, 0) == IQS269_SLIDER_RAW ||
iqs269_slider_type(iqs269, 1) == IQS269_SLIDER_RAW)
general |= IQS269_SYS_SETTINGS_EVENT_MODE_LP;
general |= IQS269_SYS_SETTINGS_REDO_ATI;
general |= IQS269_SYS_SETTINGS_ACK_RESET;
sys_reg->general = cpu_to_be16(general);
return 0;
}
static const struct reg_sequence iqs269_tws_init[] = {
{ IQS269_TOUCH_HOLD_SLIDER_SEL, IQS269_TOUCH_HOLD_DEFAULT },
{ 0xF0, 0x580F },
{ 0xF0, 0x59EF },
};
static int iqs269_dev_init(struct iqs269_private *iqs269)
{
int error;
mutex_lock(&iqs269->lock);
/*
* Early revisions of silicon require the following workaround in order
* to restore any OTP-enabled functionality after a soft reset.
*/
if (iqs269->otp_option == IQS269_OTP_OPTION_TWS &&
iqs269->ver_info.fw_num < IQS269_VER_INFO_FW_NUM_3) {
error = regmap_multi_reg_write(iqs269->regmap, iqs269_tws_init,
ARRAY_SIZE(iqs269_tws_init));
if (error)
goto err_mutex;
}
error = regmap_update_bits(iqs269->regmap, IQS269_HALL_UI,
IQS269_HALL_UI_ENABLE,
iqs269->hall_enable ? ~0 : 0);
if (error)
goto err_mutex;
error = regmap_raw_write(iqs269->regmap, IQS269_SYS_SETTINGS,
&iqs269->sys_reg, sizeof(iqs269->sys_reg));
if (error)
goto err_mutex;
/*
* The following delay gives the device time to deassert its RDY output
* so as to prevent an interrupt from being serviced prematurely.
*/
usleep_range(2000, 2100);
iqs269->ati_current = true;
err_mutex:
mutex_unlock(&iqs269->lock);
return error;
}
static int iqs269_input_init(struct iqs269_private *iqs269)
{
struct i2c_client *client = iqs269->client;
unsigned int sw_code, keycode;
int error, i, j;
iqs269->keypad = devm_input_allocate_device(&client->dev);
if (!iqs269->keypad)
return -ENOMEM;
iqs269->keypad->keycodemax = ARRAY_SIZE(iqs269->keycode);
iqs269->keypad->keycode = iqs269->keycode;
iqs269->keypad->keycodesize = sizeof(*iqs269->keycode);
iqs269->keypad->name = "iqs269a_keypad";
iqs269->keypad->id.bustype = BUS_I2C;
for (i = 0; i < ARRAY_SIZE(iqs269_events); i++) {
sw_code = iqs269->switches[i].code;
for (j = 0; j < IQS269_NUM_CH; j++) {
keycode = iqs269->keycode[i * IQS269_NUM_CH + j];
/*
* Hall-effect sensing repurposes a pair of dedicated
* channels, only one of which reports events.
*/
switch (j) {
case IQS269_CHx_HALL_ACTIVE:
if (iqs269->hall_enable &&
iqs269->switches[i].enabled)
input_set_capability(iqs269->keypad,
EV_SW, sw_code);
fallthrough;
case IQS269_CHx_HALL_INACTIVE:
if (iqs269->hall_enable)
continue;
fallthrough;
default:
if (keycode != KEY_RESERVED)
input_set_capability(iqs269->keypad,
EV_KEY, keycode);
}
}
}
for (i = 0; i < IQS269_NUM_SL; i++) {
if (iqs269_slider_type(iqs269, i) == IQS269_SLIDER_NONE)
continue;
iqs269->slider[i] = devm_input_allocate_device(&client->dev);
if (!iqs269->slider[i])
return -ENOMEM;
iqs269->slider[i]->keycodemax = ARRAY_SIZE(iqs269->sl_code[i]);
iqs269->slider[i]->keycode = iqs269->sl_code[i];
iqs269->slider[i]->keycodesize = sizeof(**iqs269->sl_code);
iqs269->slider[i]->name = i ? "iqs269a_slider_1"
: "iqs269a_slider_0";
iqs269->slider[i]->id.bustype = BUS_I2C;
for (j = 0; j < IQS269_NUM_GESTURES; j++)
if (iqs269->sl_code[i][j] != KEY_RESERVED)
input_set_capability(iqs269->slider[i], EV_KEY,
iqs269->sl_code[i][j]);
/*
* Present the slider as a narrow trackpad if one or more chan-
* nels have been selected to participate, but no gestures have
* been mapped to a keycode.
*/
if (iqs269_slider_type(iqs269, i) == IQS269_SLIDER_RAW) {
input_set_capability(iqs269->slider[i],
EV_KEY, BTN_TOUCH);
input_set_abs_params(iqs269->slider[i],
ABS_X, 0, 255, 0, 0);
}
error = input_register_device(iqs269->slider[i]);
if (error) {
dev_err(&client->dev,
"Failed to register slider %d: %d\n", i, error);
return error;
}
}
return 0;
}
static int iqs269_report(struct iqs269_private *iqs269)
{
struct i2c_client *client = iqs269->client;
struct iqs269_flags flags;
unsigned int sw_code, keycode;
int error, i, j;
u8 slider_x[IQS269_NUM_SL];
u8 dir_mask, state;
error = regmap_raw_read(iqs269->regmap, IQS269_SYS_FLAGS, &flags,
sizeof(flags));
if (error) {
dev_err(&client->dev, "Failed to read device status: %d\n",
error);
return error;
}
/*
* The device resets itself if its own watchdog bites, which can happen
* in the event of an I2C communication error. In this case, the device
* asserts a SHOW_RESET interrupt and all registers must be restored.
*/
if (be16_to_cpu(flags.system) & IQS269_SYS_FLAGS_SHOW_RESET) {
dev_err(&client->dev, "Unexpected device reset\n");
error = iqs269_dev_init(iqs269);
if (error)
dev_err(&client->dev,
"Failed to re-initialize device: %d\n", error);
return error;
}
if (be16_to_cpu(flags.system) & IQS269_SYS_FLAGS_IN_ATI)
return 0;
if (iqs269_slider_type(iqs269, 0) == IQS269_SLIDER_RAW ||
iqs269_slider_type(iqs269, 1) == IQS269_SLIDER_RAW) {
error = regmap_raw_read(iqs269->regmap, IQS269_SLIDER_X,
slider_x, sizeof(slider_x));
if (error) {
dev_err(&client->dev,
"Failed to read slider position: %d\n", error);
return error;
}
}
for (i = 0; i < IQS269_NUM_SL; i++) {
flags.gesture >>= (i * IQS269_NUM_GESTURES);
switch (iqs269_slider_type(iqs269, i)) {
case IQS269_SLIDER_NONE:
continue;
case IQS269_SLIDER_KEY:
for (j = 0; j < IQS269_NUM_GESTURES; j++)
input_report_key(iqs269->slider[i],
iqs269->sl_code[i][j],
flags.gesture & BIT(j));
if (!(flags.gesture & (BIT(IQS269_GESTURE_FLICK_NEG) |
BIT(IQS269_GESTURE_FLICK_POS) |
BIT(IQS269_GESTURE_TAP))))
break;
input_sync(iqs269->slider[i]);
/*
* Momentary gestures are followed by a complementary
* release cycle so as to emulate a full keystroke.
*/
for (j = 0; j < IQS269_NUM_GESTURES; j++)
if (j != IQS269_GESTURE_HOLD)
input_report_key(iqs269->slider[i],
iqs269->sl_code[i][j],
0);
break;
case IQS269_SLIDER_RAW:
/*
* The slider is considered to be in a state of touch
* if any selected channels are in a state of touch.
*/
state = flags.states[IQS269_ST_OFFS_TOUCH];
state &= iqs269->sys_reg.slider_select[i];
input_report_key(iqs269->slider[i], BTN_TOUCH, state);
if (state)
input_report_abs(iqs269->slider[i],
ABS_X, slider_x[i]);
break;
}
input_sync(iqs269->slider[i]);
}
for (i = 0; i < ARRAY_SIZE(iqs269_events); i++) {
dir_mask = flags.states[IQS269_ST_OFFS_DIR];
if (!iqs269_events[i].dir_up)
dir_mask = ~dir_mask;
state = flags.states[iqs269_events[i].st_offs] & dir_mask;
sw_code = iqs269->switches[i].code;
for (j = 0; j < IQS269_NUM_CH; j++) {
keycode = iqs269->keycode[i * IQS269_NUM_CH + j];
switch (j) {
case IQS269_CHx_HALL_ACTIVE:
if (iqs269->hall_enable &&
iqs269->switches[i].enabled)
input_report_switch(iqs269->keypad,
sw_code,
state & BIT(j));
fallthrough;
case IQS269_CHx_HALL_INACTIVE:
if (iqs269->hall_enable)
continue;
fallthrough;
default:
input_report_key(iqs269->keypad, keycode,
state & BIT(j));
}
}
}
input_sync(iqs269->keypad);
/*
* The following completion signals that ATI has finished, any initial
* switch states have been reported and the keypad can be registered.
*/
complete_all(&iqs269->ati_done);
return 0;
}
static irqreturn_t iqs269_irq(int irq, void *context)
{
struct iqs269_private *iqs269 = context;
if (iqs269_report(iqs269))
return IRQ_NONE;
/*
* The device does not deassert its interrupt (RDY) pin until shortly
* after receiving an I2C stop condition; the following delay ensures
* the interrupt handler does not return before this time.
*/
iqs269_irq_wait();
return IRQ_HANDLED;
}
static ssize_t counts_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct i2c_client *client = iqs269->client;
__le16 counts;
int error;
if (!iqs269->ati_current || iqs269->hall_enable)
return -EPERM;
if (!completion_done(&iqs269->ati_done))
return -EBUSY;
/*
* Unsolicited I2C communication prompts the device to assert its RDY
* pin, so disable the interrupt line until the operation is finished
* and RDY has been deasserted.
*/
disable_irq(client->irq);
error = regmap_raw_read(iqs269->regmap,
IQS269_CHx_COUNTS + iqs269->ch_num * 2,
&counts, sizeof(counts));
iqs269_irq_wait();
enable_irq(client->irq);
if (error)
return error;
return sysfs_emit(buf, "%u\n", le16_to_cpu(counts));
}
static ssize_t hall_bin_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
struct i2c_client *client = iqs269->client;
unsigned int val;
int error;
disable_irq(client->irq);
error = regmap_read(iqs269->regmap, IQS269_CAL_DATA_A, &val);
iqs269_irq_wait();
enable_irq(client->irq);
if (error)
return error;
switch (ch_reg[IQS269_CHx_HALL_ACTIVE].rx_enable &
ch_reg[IQS269_CHx_HALL_INACTIVE].rx_enable) {
case IQS269_HALL_PAD_R:
val &= IQS269_CAL_DATA_A_HALL_BIN_R_MASK;
val >>= IQS269_CAL_DATA_A_HALL_BIN_R_SHIFT;
break;
case IQS269_HALL_PAD_L:
val &= IQS269_CAL_DATA_A_HALL_BIN_L_MASK;
val >>= IQS269_CAL_DATA_A_HALL_BIN_L_SHIFT;
break;
default:
return -EINVAL;
}
return sysfs_emit(buf, "%u\n", val);
}
static ssize_t hall_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
return sysfs_emit(buf, "%u\n", iqs269->hall_enable);
}
static ssize_t hall_enable_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
unsigned int val;
int error;
error = kstrtouint(buf, 10, &val);
if (error)
return error;
mutex_lock(&iqs269->lock);
iqs269->hall_enable = val;
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
return count;
}
static ssize_t ch_number_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
return sysfs_emit(buf, "%u\n", iqs269->ch_num);
}
static ssize_t ch_number_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
unsigned int val;
int error;
error = kstrtouint(buf, 10, &val);
if (error)
return error;
if (val >= IQS269_NUM_CH)
return -EINVAL;
iqs269->ch_num = val;
return count;
}
static ssize_t rx_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
return sysfs_emit(buf, "%u\n", ch_reg[iqs269->ch_num].rx_enable);
}
static ssize_t rx_enable_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct iqs269_ch_reg *ch_reg = iqs269->sys_reg.ch_reg;
unsigned int val;
int error;
error = kstrtouint(buf, 10, &val);
if (error)
return error;
if (val > 0xFF)
return -EINVAL;
mutex_lock(&iqs269->lock);
ch_reg[iqs269->ch_num].rx_enable = val;
iqs269->ati_current = false;
mutex_unlock(&iqs269->lock);
return count;
}
static ssize_t ati_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
unsigned int val;
int error;
error = iqs269_ati_mode_get(iqs269, iqs269->ch_num, &val);
if (error)
return error;
return sysfs_emit(buf, "%u\n", val);
}
static ssize_t ati_mode_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
unsigned int val;
int error;
error = kstrtouint(buf, 10, &val);
if (error)
return error;
error = iqs269_ati_mode_set(iqs269, iqs269->ch_num, val);
if (error)
return error;
return count;
}
static ssize_t ati_base_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
unsigned int val;
int error;
error = iqs269_ati_base_get(iqs269, iqs269->ch_num, &val);
if (error)
return error;
return sysfs_emit(buf, "%u\n", val);
}
static ssize_t ati_base_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
unsigned int val;
int error;
error = kstrtouint(buf, 10, &val);
if (error)
return error;
error = iqs269_ati_base_set(iqs269, iqs269->ch_num, val);
if (error)
return error;
return count;
}
static ssize_t ati_target_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
unsigned int val;
int error;
error = iqs269_ati_target_get(iqs269, iqs269->ch_num, &val);
if (error)
return error;
return sysfs_emit(buf, "%u\n", val);
}
static ssize_t ati_target_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
unsigned int val;
int error;
error = kstrtouint(buf, 10, &val);
if (error)
return error;
error = iqs269_ati_target_set(iqs269, iqs269->ch_num, val);
if (error)
return error;
return count;
}
static ssize_t ati_trigger_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
return sysfs_emit(buf, "%u\n",
iqs269->ati_current &&
completion_done(&iqs269->ati_done));
}
static ssize_t ati_trigger_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct i2c_client *client = iqs269->client;
unsigned int val;
int error;
error = kstrtouint(buf, 10, &val);
if (error)
return error;
if (!val)
return count;
disable_irq(client->irq);
reinit_completion(&iqs269->ati_done);
error = iqs269_dev_init(iqs269);
iqs269_irq_wait();
enable_irq(client->irq);
if (error)
return error;
if (!wait_for_completion_timeout(&iqs269->ati_done,
msecs_to_jiffies(2000)))
return -ETIMEDOUT;
return count;
}
static DEVICE_ATTR_RO(counts);
static DEVICE_ATTR_RO(hall_bin);
static DEVICE_ATTR_RW(hall_enable);
static DEVICE_ATTR_RW(ch_number);
static DEVICE_ATTR_RW(rx_enable);
static DEVICE_ATTR_RW(ati_mode);
static DEVICE_ATTR_RW(ati_base);
static DEVICE_ATTR_RW(ati_target);
static DEVICE_ATTR_RW(ati_trigger);
static struct attribute *iqs269_attrs[] = {
&dev_attr_counts.attr,
&dev_attr_hall_bin.attr,
&dev_attr_hall_enable.attr,
&dev_attr_ch_number.attr,
&dev_attr_rx_enable.attr,
&dev_attr_ati_mode.attr,
&dev_attr_ati_base.attr,
&dev_attr_ati_target.attr,
&dev_attr_ati_trigger.attr,
NULL,
};
ATTRIBUTE_GROUPS(iqs269);
static const struct regmap_config iqs269_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = IQS269_MAX_REG,
};
static int iqs269_probe(struct i2c_client *client)
{
struct iqs269_private *iqs269;
int error;
iqs269 = devm_kzalloc(&client->dev, sizeof(*iqs269), GFP_KERNEL);
if (!iqs269)
return -ENOMEM;
i2c_set_clientdata(client, iqs269);
iqs269->client = client;
iqs269->regmap = devm_regmap_init_i2c(client, &iqs269_regmap_config);
if (IS_ERR(iqs269->regmap)) {
error = PTR_ERR(iqs269->regmap);
dev_err(&client->dev, "Failed to initialize register map: %d\n",
error);
return error;
}
mutex_init(&iqs269->lock);
init_completion(&iqs269->ati_done);
iqs269->otp_option = (uintptr_t)device_get_match_data(&client->dev);
error = regmap_raw_read(iqs269->regmap, IQS269_VER_INFO,
&iqs269->ver_info, sizeof(iqs269->ver_info));
if (error)
return error;
if (iqs269->ver_info.prod_num != IQS269_VER_INFO_PROD_NUM) {
dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
iqs269->ver_info.prod_num);
return -EINVAL;
}
error = iqs269_parse_prop(iqs269);
if (error)
return error;
error = iqs269_dev_init(iqs269);
if (error) {
dev_err(&client->dev, "Failed to initialize device: %d\n",
error);
return error;
}
error = iqs269_input_init(iqs269);
if (error)
return error;
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, iqs269_irq, IRQF_ONESHOT,
client->name, iqs269);
if (error) {
dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
return error;
}
if (!wait_for_completion_timeout(&iqs269->ati_done,
msecs_to_jiffies(2000))) {
dev_err(&client->dev, "Failed to complete ATI\n");
return -ETIMEDOUT;
}
/*
* The keypad may include one or more switches and is not registered
* until ATI is complete and the initial switch states are read.
*/
error = input_register_device(iqs269->keypad);
if (error) {
dev_err(&client->dev, "Failed to register keypad: %d\n", error);
return error;
}
return error;
}
static u16 iqs269_general_get(struct iqs269_private *iqs269)
{
u16 general = be16_to_cpu(iqs269->sys_reg.general);
general &= ~IQS269_SYS_SETTINGS_REDO_ATI;
general &= ~IQS269_SYS_SETTINGS_ACK_RESET;
return general | IQS269_SYS_SETTINGS_DIS_AUTO;
}
static int iqs269_suspend(struct device *dev)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct i2c_client *client = iqs269->client;
int error;
u16 general = iqs269_general_get(iqs269);
if (!(general & IQS269_SYS_SETTINGS_PWR_MODE_MASK))
return 0;
disable_irq(client->irq);
error = regmap_write(iqs269->regmap, IQS269_SYS_SETTINGS, general);
iqs269_irq_wait();
enable_irq(client->irq);
return error;
}
static int iqs269_resume(struct device *dev)
{
struct iqs269_private *iqs269 = dev_get_drvdata(dev);
struct i2c_client *client = iqs269->client;
int error;
u16 general = iqs269_general_get(iqs269);
if (!(general & IQS269_SYS_SETTINGS_PWR_MODE_MASK))
return 0;
disable_irq(client->irq);
error = regmap_write(iqs269->regmap, IQS269_SYS_SETTINGS,
general & ~IQS269_SYS_SETTINGS_PWR_MODE_MASK);
if (!error)
error = regmap_write(iqs269->regmap, IQS269_SYS_SETTINGS,
general & ~IQS269_SYS_SETTINGS_DIS_AUTO);
iqs269_irq_wait();
enable_irq(client->irq);
return error;
}
static DEFINE_SIMPLE_DEV_PM_OPS(iqs269_pm, iqs269_suspend, iqs269_resume);
static const struct of_device_id iqs269_of_match[] = {
{
.compatible = "azoteq,iqs269a",
.data = (void *)IQS269_OTP_OPTION_DEFAULT,
},
{
.compatible = "azoteq,iqs269a-00",
.data = (void *)IQS269_OTP_OPTION_DEFAULT,
},
{
.compatible = "azoteq,iqs269a-d0",
.data = (void *)IQS269_OTP_OPTION_TWS,
},
{ }
};
MODULE_DEVICE_TABLE(of, iqs269_of_match);
static struct i2c_driver iqs269_i2c_driver = {
.driver = {
.name = "iqs269a",
.dev_groups = iqs269_groups,
.of_match_table = iqs269_of_match,
.pm = pm_sleep_ptr(&iqs269_pm),
},
.probe = iqs269_probe,
};
module_i2c_driver(iqs269_i2c_driver);
MODULE_AUTHOR("Jeff LaBundy <[email protected]>");
MODULE_DESCRIPTION("Azoteq IQS269A Capacitive Touch Controller");
MODULE_LICENSE("GPL");
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