This patch adds support for the Azoteq IQS626A capacitive touch
controller.
Signed-off-by: Jeff LaBundy <jeff@xxxxxxxxxxx>
---
Changes in v2:
- Dropped guards for CONFIG_TOUCHSCREEN_PROPERTIES
drivers/input/misc/Kconfig | 11 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/iqs626a.c | 1837 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1849 insertions(+)
create mode 100644 drivers/input/misc/iqs626a.c
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index ad1b6c9..bbab23a 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -752,6 +752,17 @@ config INPUT_IQS269A
To compile this driver as a module, choose M here: the
module will be called iqs269a.
+config INPUT_IQS626A
+ tristate "Azoteq IQS626A capacitive touch controller"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ Say Y to enable support for the Azoteq IQS626A capacitive
+ touch controller.
+
+ To compile this driver as a module, choose M here: the
+ module will be called iqs626a.
+
config INPUT_CMA3000
tristate "VTI CMA3000 Tri-axis accelerometer"
help
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 7f202ba..034c80a7 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_INPUT_HISI_POWERKEY) += hisi_powerkey.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_IMS_PCU) += ims-pcu.o
obj-$(CONFIG_INPUT_IQS269A) += iqs269a.o
+obj-$(CONFIG_INPUT_IQS626A) += iqs626a.o
obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
obj-$(CONFIG_INPUT_KXTJ9) += kxtj9.o
diff --git a/drivers/input/misc/iqs626a.c b/drivers/input/misc/iqs626a.c
new file mode 100644
index 0000000..6b4c307
--- /dev/null
+++ b/drivers/input/misc/iqs626a.c
@@ -0,0 +1,1837 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Azoteq IQS626A Capacitive Touch Controller
+ *
+ * Copyright (C) 2020 Jeff LaBundy <jeff@xxxxxxxxxxx>
+ *
+ * This driver registers up to 2 input devices: one representing capacitive or
+ * inductive keys as well as Hall-effect switches, and one for a trackpad that
+ * can express various gestures.
+ */
+
+#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/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define IQS626_VER_INFO 0x00
+#define IQS626_VER_INFO_PROD_NUM 0x51
+
+#define IQS626_SYS_FLAGS 0x02
+#define IQS626_SYS_FLAGS_SHOW_RESET BIT(15)
+#define IQS626_SYS_FLAGS_IN_ATI BIT(12)
+#define IQS626_SYS_FLAGS_PWR_MODE_MASK GENMASK(9, 8)
+#define IQS626_SYS_FLAGS_PWR_MODE_SHIFT 8
+
+#define IQS626_HALL_OUTPUT 0x23
+
+#define IQS626_SYS_SETTINGS 0x80
+#define IQS626_SYS_SETTINGS_CLK_DIV BIT(15)
+#define IQS626_SYS_SETTINGS_ULP_AUTO BIT(14)
+#define IQS626_SYS_SETTINGS_DIS_AUTO BIT(13)
+#define IQS626_SYS_SETTINGS_PWR_MODE_MASK GENMASK(12, 11)
+#define IQS626_SYS_SETTINGS_PWR_MODE_SHIFT 11
+#define IQS626_SYS_SETTINGS_PWR_MODE_MAX 3
+#define IQS626_SYS_SETTINGS_ULP_UPDATE_MASK GENMASK(10, 8)
+#define IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT 8
+#define IQS626_SYS_SETTINGS_ULP_UPDATE_MAX 7
+#define IQS626_SYS_SETTINGS_EVENT_MODE BIT(5)
+#define IQS626_SYS_SETTINGS_EVENT_MODE_LP BIT(4)
+#define IQS626_SYS_SETTINGS_REDO_ATI BIT(2)
+#define IQS626_SYS_SETTINGS_ACK_RESET BIT(0)
+
+#define IQS626_MISC_A_ATI_BAND_DISABLE BIT(7)
+#define IQS626_MISC_A_TPx_LTA_UPDATE_MASK GENMASK(6, 4)
+#define IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT 4
+#define IQS626_MISC_A_TPx_LTA_UPDATE_MAX 7
+#define IQS626_MISC_A_ATI_LP_ONLY BIT(3)
+#define IQS626_MISC_A_GPIO3_SELECT_MASK GENMASK(2, 0)
+#define IQS626_MISC_A_GPIO3_SELECT_MAX 7
+
+#define IQS626_EVENT_MASK_SYS BIT(6)
+#define IQS626_EVENT_MASK_GESTURE BIT(3)
+#define IQS626_EVENT_MASK_DEEP BIT(2)
+#define IQS626_EVENT_MASK_TOUCH BIT(1)
+#define IQS626_EVENT_MASK_PROX BIT(0)
+
+#define IQS626_RATE_NP_MS_MAX 255
+#define IQS626_RATE_LP_MS_MAX 255
+#define IQS626_RATE_ULP_MS_MAX 4080
+#define IQS626_TIMEOUT_PWR_MS_MAX 130560
+#define IQS626_TIMEOUT_LTA_MS_MAX 130560
+
+#define IQS626_MISC_B_RESEED_UI_SEL_MASK GENMASK(7, 6)
+#define IQS626_MISC_B_RESEED_UI_SEL_SHIFT 6
+#define IQS626_MISC_B_RESEED_UI_SEL_MAX 3
+#define IQS626_MISC_B_THRESH_EXTEND BIT(5)
+#define IQS626_MISC_B_TRACKING_UI_ENABLE BIT(4)
+#define IQS626_MISC_B_TPx_SWIPE BIT(3)
+#define IQS626_MISC_B_RESEED_OFFSET BIT(2)
+#define IQS626_MISC_B_FILT_STR_TPx GENMASK(1, 0)
+
+#define IQS626_THRESH_SWIPE_MAX 255
+#define IQS626_TIMEOUT_TAP_MS_MAX 4080
+#define IQS626_TIMEOUT_SWIPE_MS_MAX 4080
+
+#define IQS626_CHx_ENG_0_MEAS_CAP_SIZE BIT(7)
+#define IQS626_CHx_ENG_0_RX_TERM_VSS BIT(5)
+#define IQS626_CHx_ENG_0_LINEARIZE BIT(4)
+#define IQS626_CHx_ENG_0_DUAL_DIR BIT(3)
+#define IQS626_CHx_ENG_0_FILT_DISABLE BIT(2)
+#define IQS626_CHx_ENG_0_ATI_MODE_MASK GENMASK(1, 0)
+#define IQS626_CHx_ENG_0_ATI_MODE_MAX 3
+
+#define IQS626_CHx_ENG_1_CCT_HIGH_1 BIT(7)
+#define IQS626_CHx_ENG_1_CCT_HIGH_0 BIT(6)
+#define IQS626_CHx_ENG_1_PROJ_BIAS_MASK GENMASK(5, 4)
+#define IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT 4
+#define IQS626_CHx_ENG_1_PROJ_BIAS_MAX 3
+#define IQS626_CHx_ENG_1_CCT_ENABLE BIT(3)
+#define IQS626_CHx_ENG_1_SENSE_FREQ_MASK GENMASK(2, 1)
+#define IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT 1
+#define IQS626_CHx_ENG_1_SENSE_FREQ_MAX 3
+#define IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN BIT(0)
+
+#define IQS626_CHx_ENG_2_LOCAL_CAP_MASK GENMASK(7, 6)
+#define IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT 6
+#define IQS626_CHx_ENG_2_LOCAL_CAP_MAX 3
+#define IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE BIT(5)
+#define IQS626_CHx_ENG_2_SENSE_MODE_MASK GENMASK(3, 0)
+#define IQS626_CHx_ENG_2_SENSE_MODE_MAX 15
+
+#define IQS626_CHx_ENG_3_TX_FREQ_MASK GENMASK(5, 4)
+#define IQS626_CHx_ENG_3_TX_FREQ_SHIFT 4
+#define IQS626_CHx_ENG_3_TX_FREQ_MAX 3
+#define IQS626_CHx_ENG_3_INV_LOGIC BIT(0)
+
+#define IQS626_CHx_ENG_4_RX_TERM_VREG BIT(6)
+#define IQS626_CHx_ENG_4_CCT_LOW_1 BIT(5)
+#define IQS626_CHx_ENG_4_CCT_LOW_0 BIT(4)
+#define IQS626_CHx_ENG_4_COMP_DISABLE BIT(1)
+#define IQS626_CHx_ENG_4_STATIC_ENABLE BIT(0)
+
+#define IQS626_TPx_ATI_BASE_MIN 45
+#define IQS626_TPx_ATI_BASE_MAX 300
+#define IQS626_CHx_ATI_BASE_MASK GENMASK(7, 6)
+#define IQS626_CHx_ATI_BASE_75 0x00
+#define IQS626_CHx_ATI_BASE_100 0x40
+#define IQS626_CHx_ATI_BASE_150 0x80
+#define IQS626_CHx_ATI_BASE_200 0xC0
+#define IQS626_CHx_ATI_TARGET_MASK GENMASK(5, 0)
+#define IQS626_CHx_ATI_TARGET_MAX 2016
+
+#define IQS626_CHx_THRESH_MAX 255
+#define IQS626_CHx_HYST_DEEP_MASK GENMASK(7, 4)
+#define IQS626_CHx_HYST_DEEP_SHIFT 4
+#define IQS626_CHx_HYST_TOUCH_MASK GENMASK(3, 0)
+#define IQS626_CHx_HYST_MAX 15
+
+#define IQS626_FILT_STR_NP_TPx_MASK GENMASK(7, 6)
+#define IQS626_FILT_STR_NP_TPx_SHIFT 6
+#define IQS626_FILT_STR_LP_TPx_MASK GENMASK(5, 4)
+#define IQS626_FILT_STR_LP_TPx_SHIFT 4
+
+#define IQS626_FILT_STR_NP_CNT_MASK GENMASK(7, 6)
+#define IQS626_FILT_STR_NP_CNT_SHIFT 6
+#define IQS626_FILT_STR_LP_CNT_MASK GENMASK(5, 4)
+#define IQS626_FILT_STR_LP_CNT_SHIFT 4
+#define IQS626_FILT_STR_NP_LTA_MASK GENMASK(3, 2)
+#define IQS626_FILT_STR_NP_LTA_SHIFT 2
+#define IQS626_FILT_STR_LP_LTA_MASK GENMASK(1, 0)
+#define IQS626_FILT_STR_MAX 3
+
+#define IQS626_ULP_PROJ_ENABLE BIT(4)
+#define IQS626_GEN_WEIGHT_MAX 255
+
+#define IQS626_MAX_REG 0xFF
+
+#define IQS626_NUM_CH_TP_3 9
+#define IQS626_NUM_CH_TP_2 6
+#define IQS626_NUM_CH_GEN 3
+#define IQS626_NUM_CRx_TX 8
+
+#define IQS626_PWR_MODE_POLL_SLEEP_US 50000
+#define IQS626_PWR_MODE_POLL_TIMEOUT_US 500000
+
+#define iqs626_irq_wait() usleep_range(350, 400)
+
+enum iqs626_ch_id {
+ IQS626_CH_ULP_0,
+ IQS626_CH_TP_2,
+ IQS626_CH_TP_3,
+ IQS626_CH_GEN_0,
+ IQS626_CH_GEN_1,
+ IQS626_CH_GEN_2,
+ IQS626_CH_HALL,
+};
+
+enum iqs626_rx_inactive {
+ IQS626_RX_INACTIVE_VSS,
+ IQS626_RX_INACTIVE_FLOAT,
+ IQS626_RX_INACTIVE_VREG,
+};
+
+enum iqs626_st_offs {
+ IQS626_ST_OFFS_PROX,
+ IQS626_ST_OFFS_DIR,
+ IQS626_ST_OFFS_TOUCH,
+ IQS626_ST_OFFS_DEEP,
+};
+
+enum iqs626_th_offs {
+ IQS626_TH_OFFS_PROX,
+ IQS626_TH_OFFS_TOUCH,
+ IQS626_TH_OFFS_DEEP,
+};
+
+enum iqs626_event_id {
+ IQS626_EVENT_PROX_DN,
+ IQS626_EVENT_PROX_UP,
+ IQS626_EVENT_TOUCH_DN,
+ IQS626_EVENT_TOUCH_UP,
+ IQS626_EVENT_DEEP_DN,
+ IQS626_EVENT_DEEP_UP,
+};
+
+enum iqs626_gesture_id {
+ IQS626_GESTURE_FLICK_X_POS,
+ IQS626_GESTURE_FLICK_X_NEG,
+ IQS626_GESTURE_FLICK_Y_POS,
+ IQS626_GESTURE_FLICK_Y_NEG,
+ IQS626_GESTURE_TAP,
+ IQS626_GESTURE_HOLD,
+ IQS626_NUM_GESTURES,
+};
+
+struct iqs626_event_desc {
+ const char *name;
+ enum iqs626_st_offs st_offs;
+ enum iqs626_th_offs th_offs;
+ bool dir_up;
+ u8 mask;
+};
+
+static const struct iqs626_event_desc iqs626_events[] = {
+ [IQS626_EVENT_PROX_DN] = {
+ .name = "event-prox",
+ .st_offs = IQS626_ST_OFFS_PROX,
+ .th_offs = IQS626_TH_OFFS_PROX,
+ .mask = IQS626_EVENT_MASK_PROX,
+ },
+ [IQS626_EVENT_PROX_UP] = {
+ .name = "event-prox-alt",
+ .st_offs = IQS626_ST_OFFS_PROX,
+ .th_offs = IQS626_TH_OFFS_PROX,
+ .dir_up = true,
+ .mask = IQS626_EVENT_MASK_PROX,
+ },
+ [IQS626_EVENT_TOUCH_DN] = {
+ .name = "event-touch",
+ .st_offs = IQS626_ST_OFFS_TOUCH,
+ .th_offs = IQS626_TH_OFFS_TOUCH,
+ .mask = IQS626_EVENT_MASK_TOUCH,
+ },
+ [IQS626_EVENT_TOUCH_UP] = {
+ .name = "event-touch-alt",
+ .st_offs = IQS626_ST_OFFS_TOUCH,
+ .th_offs = IQS626_TH_OFFS_TOUCH,
+ .dir_up = true,
+ .mask = IQS626_EVENT_MASK_TOUCH,
+ },
+ [IQS626_EVENT_DEEP_DN] = {
+ .name = "event-deep",
+ .st_offs = IQS626_ST_OFFS_DEEP,
+ .th_offs = IQS626_TH_OFFS_DEEP,
+ .mask = IQS626_EVENT_MASK_DEEP,
+ },
+ [IQS626_EVENT_DEEP_UP] = {
+ .name = "event-deep-alt",
+ .st_offs = IQS626_ST_OFFS_DEEP,
+ .th_offs = IQS626_TH_OFFS_DEEP,
+ .dir_up = true,
+ .mask = IQS626_EVENT_MASK_DEEP,
+ },
+};
+
+struct iqs626_ver_info {
+ u8 prod_num;
+ u8 sw_num;
+ u8 hw_num;
+ u8 padding;
+} __packed;
+
+struct iqs626_flags {
+ __be16 system;
+ u8 gesture;
+ u8 padding_a;
+ u8 states[4];
+ u8 ref_active;
+ u8 padding_b;
+ u8 comp_min;
+ u8 comp_max;
+ u8 trackpad_x;
+ u8 trackpad_y;
+} __packed;
+
+struct iqs626_ch_reg_ulp {
+ u8 thresh[2];
+ u8 hyst;
+ u8 filter;
+ u8 engine[2];
+ u8 ati_target;
+ u8 padding;
+ __be16 ati_comp;
+ u8 rx_enable;
+ u8 tx_enable;
+} __packed;
+
+struct iqs626_ch_reg_tp {
+ u8 thresh;
+ u8 ati_base;
+ __be16 ati_comp;
+} __packed;
+
+struct iqs626_tp_grp_reg {
+ u8 hyst;
+ u8 ati_target;
+ u8 engine[2];
+ struct iqs626_ch_reg_tp ch_reg_tp[IQS626_NUM_CH_TP_3];
+} __packed;
+
+struct iqs626_ch_reg_gen {
+ u8 thresh[3];
+ u8 padding;
+ u8 hyst;
+ u8 ati_target;
+ __be16 ati_comp;
+ u8 engine[5];
+ u8 filter;
+ u8 rx_enable;
+ u8 tx_enable;
+ u8 assoc_select;
+ u8 assoc_weight;
+} __packed;
+
+struct iqs626_ch_reg_hall {
+ u8 engine;
+ u8 thresh;
+ u8 hyst;
+ u8 ati_target;
+ __be16 ati_comp;
+} __packed;
+
+struct iqs626_sys_reg {
+ __be16 general;
+ u8 misc_a;
+ u8 event_mask;
+ u8 active;
+ u8 reseed;
+ u8 rate_np;
+ u8 rate_lp;
+ u8 rate_ulp;
+ u8 timeout_pwr;
+ u8 timeout_rdy;
+ u8 timeout_lta;
+ u8 misc_b;
+ u8 thresh_swipe;
+ u8 timeout_tap;
+ u8 timeout_swipe;
+ u8 redo_ati;
+ u8 padding;
+ struct iqs626_ch_reg_ulp ch_reg_ulp;
+ struct iqs626_tp_grp_reg tp_grp_reg;
+ struct iqs626_ch_reg_gen ch_reg_gen[IQS626_NUM_CH_GEN];
+ struct iqs626_ch_reg_hall ch_reg_hall;
+} __packed;
+
+struct iqs626_channel_desc {
+ const char *name;
+ int num_ch;
+ u8 active;
+ bool events[ARRAY_SIZE(iqs626_events)];
+};
+
+static const struct iqs626_channel_desc iqs626_channels[] = {
+ [IQS626_CH_ULP_0] = {
+ .name = "ulp-0",
+ .num_ch = 1,
+ .active = BIT(0),
+ .events = {
+ [IQS626_EVENT_PROX_DN] = true,
+ [IQS626_EVENT_PROX_UP] = true,
+ [IQS626_EVENT_TOUCH_DN] = true,
+ [IQS626_EVENT_TOUCH_UP] = true,
+ },
+ },
+ [IQS626_CH_TP_2] = {
+ .name = "trackpad-3x2",
+ .num_ch = IQS626_NUM_CH_TP_2,
+ .active = BIT(1),
+ .events = {
+ [IQS626_EVENT_TOUCH_DN] = true,
+ },
+ },
+ [IQS626_CH_TP_3] = {
+ .name = "trackpad-3x3",
+ .num_ch = IQS626_NUM_CH_TP_3,
+ .active = BIT(2) | BIT(1),
+ .events = {
+ [IQS626_EVENT_TOUCH_DN] = true,
+ },
+ },
+ [IQS626_CH_GEN_0] = {
+ .name = "generic-0",
+ .num_ch = 1,
+ .active = BIT(4),
+ .events = {
+ [IQS626_EVENT_PROX_DN] = true,
+ [IQS626_EVENT_PROX_UP] = true,
+ [IQS626_EVENT_TOUCH_DN] = true,
+ [IQS626_EVENT_TOUCH_UP] = true,
+ [IQS626_EVENT_DEEP_DN] = true,
+ [IQS626_EVENT_DEEP_UP] = true,
+ },
+ },
+ [IQS626_CH_GEN_1] = {
+ .name = "generic-1",
+ .num_ch = 1,
+ .active = BIT(5),
+ .events = {
+ [IQS626_EVENT_PROX_DN] = true,
+ [IQS626_EVENT_PROX_UP] = true,
+ [IQS626_EVENT_TOUCH_DN] = true,
+ [IQS626_EVENT_TOUCH_UP] = true,
+ [IQS626_EVENT_DEEP_DN] = true,
+ [IQS626_EVENT_DEEP_UP] = true,
+ },
+ },
+ [IQS626_CH_GEN_2] = {
+ .name = "generic-2",
+ .num_ch = 1,
+ .active = BIT(6),
+ .events = {
+ [IQS626_EVENT_PROX_DN] = true,
+ [IQS626_EVENT_PROX_UP] = true,
+ [IQS626_EVENT_TOUCH_DN] = true,
+ [IQS626_EVENT_TOUCH_UP] = true,
+ [IQS626_EVENT_DEEP_DN] = true,
+ [IQS626_EVENT_DEEP_UP] = true,
+ },
+ },
+ [IQS626_CH_HALL] = {
+ .name = "hall",
+ .num_ch = 1,
+ .active = BIT(7),
+ .events = {
+ [IQS626_EVENT_TOUCH_DN] = true,
+ [IQS626_EVENT_TOUCH_UP] = true,
+ },
+ },
+};
+
+struct iqs626_private {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct iqs626_sys_reg sys_reg;
+ struct completion ati_done;
+ struct input_dev *keypad;
+ struct input_dev *trackpad;
+ struct touchscreen_properties prop;
+ unsigned int kp_type[ARRAY_SIZE(iqs626_channels)]
+ [ARRAY_SIZE(iqs626_events)];
+ unsigned int kp_code[ARRAY_SIZE(iqs626_channels)]
+ [ARRAY_SIZE(iqs626_events)];
+ unsigned int tp_code[IQS626_NUM_GESTURES];
+ unsigned int suspend_mode;
+};
+
+static int iqs626_parse_events(struct iqs626_private *iqs626,
+ const struct fwnode_handle *ch_node,
+ enum iqs626_ch_id ch_id)
+{
+ struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
+ struct i2c_client *client = iqs626->client;
+ const struct fwnode_handle *ev_node;
+ const char *ev_name;
+ u8 *thresh, *hyst;
+ unsigned int thresh_tp[IQS626_NUM_CH_TP_3];
+ unsigned int val;
+ int num_ch = iqs626_channels[ch_id].num_ch;
+ int error, i, j;
+
+ switch (ch_id) {
+ case IQS626_CH_ULP_0:
+ thresh = sys_reg->ch_reg_ulp.thresh;
+ hyst = &sys_reg->ch_reg_ulp.hyst;
+ break;
+
+ case IQS626_CH_TP_2:
+ case IQS626_CH_TP_3:
+ thresh = &sys_reg->tp_grp_reg.ch_reg_tp[0].thresh;
+ hyst = &sys_reg->tp_grp_reg.hyst;
+ break;
+
+ case IQS626_CH_GEN_0:
+ case IQS626_CH_GEN_1:
+ case IQS626_CH_GEN_2:
+ i = ch_id - IQS626_CH_GEN_0;
+ thresh = sys_reg->ch_reg_gen[i].thresh;
+ hyst = &sys_reg->ch_reg_gen[i].hyst;
+ break;
+
+ case IQS626_CH_HALL:
+ thresh = &sys_reg->ch_reg_hall.thresh;
+ hyst = &sys_reg->ch_reg_hall.hyst;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(iqs626_events); i++) {
+ if (!iqs626_channels[ch_id].events[i])
+ continue;
+
+ if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3) {
+ /*
+ * Trackpad touch events are simply described under the
+ * trackpad child node.
+ */
+ ev_node = ch_node;
+ } else {
+ ev_name = iqs626_events[i].name;
+ ev_node = fwnode_get_named_child_node(ch_node, ev_name);
+ if (!ev_node)
+ continue;
+
+ if (!fwnode_property_read_u32(ev_node, "linux,code",
+ &val)) {
+ iqs626->kp_code[ch_id][i] = val;
+
+ if (fwnode_property_read_u32(ev_node,
+ "linux,input-type",
+ &val)) {
+ if (ch_id == IQS626_CH_HALL)
+ val = EV_SW;
+ else
+ val = EV_KEY;
+ }
+
+ if (val != EV_KEY && val != EV_SW) {
+ dev_err(&client->dev,
+ "Invalid input type: %u\n",
+ val);
+ return -EINVAL;
+ }
+
+ iqs626->kp_type[ch_id][i] = val;
+
+ sys_reg->event_mask &= ~iqs626_events[i].mask;
+ }
+ }
+
+ if (!fwnode_property_read_u32(ev_node, "azoteq,hyst", &val)) {
+ if (val > IQS626_CHx_HYST_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel hysteresis: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ if (i == IQS626_EVENT_DEEP_DN ||
+ i == IQS626_EVENT_DEEP_UP) {
+ *hyst &= ~IQS626_CHx_HYST_DEEP_MASK;
+ *hyst |= (val << IQS626_CHx_HYST_DEEP_SHIFT);
+ } else if (i == IQS626_EVENT_TOUCH_DN ||
+ i == IQS626_EVENT_TOUCH_UP) {
+ *hyst &= ~IQS626_CHx_HYST_TOUCH_MASK;
+ *hyst |= val;
+ }
+ }
+
+ if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
+ !fwnode_property_read_u32(ev_node, "azoteq,thresh", &val)) {
+ if (val > IQS626_CHx_THRESH_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel threshold: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ if (ch_id == IQS626_CH_HALL)
+ *thresh = val;
+ else
+ *(thresh + iqs626_events[i].th_offs) = val;
+
+ continue;
+ }
+
+ if (!fwnode_property_present(ev_node, "azoteq,thresh"))
+ continue;
+
+ error = fwnode_property_read_u32_array(ev_node, "azoteq,thresh",
+ thresh_tp, num_ch);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to read %s channel thresholds: %d\n",
+ fwnode_get_name(ch_node), error);
+ return error;
+ }
+
+ for (j = 0; j < num_ch; j++) {
+ if (thresh_tp[j] > IQS626_CHx_THRESH_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel threshold: %u\n",
+ fwnode_get_name(ch_node), thresh_tp[j]);
+ return -EINVAL;
+ }
+
+ sys_reg->tp_grp_reg.ch_reg_tp[j].thresh = thresh_tp[j];
+ }
+ }
+
+ return 0;
+}
+
+static int iqs626_parse_ati_target(struct iqs626_private *iqs626,
+ const struct fwnode_handle *ch_node,
+ enum iqs626_ch_id ch_id)
+{
+ struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
+ struct i2c_client *client = iqs626->client;
+ unsigned int ati_base[IQS626_NUM_CH_TP_3];
+ unsigned int val;
+ u8 *ati_target;
+ int num_ch = iqs626_channels[ch_id].num_ch;
+ int error, i;
+
+ switch (ch_id) {
+ case IQS626_CH_ULP_0:
+ ati_target = &sys_reg->ch_reg_ulp.ati_target;
+ break;
+
+ case IQS626_CH_TP_2:
+ case IQS626_CH_TP_3:
+ ati_target = &sys_reg->tp_grp_reg.ati_target;
+ break;
+
+ case IQS626_CH_GEN_0:
+ case IQS626_CH_GEN_1:
+ case IQS626_CH_GEN_2:
+ i = ch_id - IQS626_CH_GEN_0;
+ ati_target = &sys_reg->ch_reg_gen[i].ati_target;
+ break;
+
+ case IQS626_CH_HALL:
+ ati_target = &sys_reg->ch_reg_hall.ati_target;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,ati-target", &val)) {
+ if (val > IQS626_CHx_ATI_TARGET_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel ATI target: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *ati_target &= ~IQS626_CHx_ATI_TARGET_MASK;
+ *ati_target |= (val / 32);
+ }
+
+ if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
+ !fwnode_property_read_u32(ch_node, "azoteq,ati-base", &val)) {
+ switch (val) {
+ case 75:
+ val = IQS626_CHx_ATI_BASE_75;
+ break;
+
+ case 100:
+ val = IQS626_CHx_ATI_BASE_100;
+ break;
+
+ case 150:
+ val = IQS626_CHx_ATI_BASE_150;
+ break;
+
+ case 200:
+ val = IQS626_CHx_ATI_BASE_200;
+ break;
+
+ default:
+ dev_err(&client->dev,
+ "Invalid %s channel ATI base: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *ati_target &= ~IQS626_CHx_ATI_BASE_MASK;
+ *ati_target |= val;
+
+ return 0;
+ }
+
+ if (!fwnode_property_present(ch_node, "azoteq,ati-base"))
+ return 0;
+
+ error = fwnode_property_read_u32_array(ch_node, "azoteq,ati-base",
+ ati_base, num_ch);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to read %s channel ATI bases: %d\n",
+ fwnode_get_name(ch_node), error);
+ return error;
+ }
+
+ for (i = 0; i < num_ch; i++) {
+ if (ati_base[i] < IQS626_TPx_ATI_BASE_MIN ||
+ ati_base[i] > IQS626_TPx_ATI_BASE_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel ATI base: %u\n",
+ fwnode_get_name(ch_node), ati_base[i]);
+ return -EINVAL;
+ }
+
+ ati_base[i] -= IQS626_TPx_ATI_BASE_MIN;
+ sys_reg->tp_grp_reg.ch_reg_tp[i].ati_base = ati_base[i];
+ }
+
+ return 0;
+}
+
+static int iqs626_parse_pins(struct iqs626_private *iqs626,
+ const struct fwnode_handle *ch_node,
+ const char *propname, u8 *enable)
+{
+ struct i2c_client *client = iqs626->client;
+ unsigned int val[IQS626_NUM_CRx_TX];
+ int error, count, i;
+
+ if (!fwnode_property_present(ch_node, propname))
+ return 0;
+
+ count = fwnode_property_count_u32(ch_node, propname);
+ if (count > IQS626_NUM_CRx_TX) {
+ dev_err(&client->dev,
+ "Too many %s channel CRX/TX pins present\n",
+ fwnode_get_name(ch_node));
+ return -EINVAL;
+ } else if (count < 0) {
+ dev_err(&client->dev,
+ "Failed to count %s channel CRX/TX pins: %d\n",
+ fwnode_get_name(ch_node), count);
+ return count;
+ }
+
+ error = fwnode_property_read_u32_array(ch_node, propname, val, count);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to read %s channel CRX/TX pins: %d\n",
+ fwnode_get_name(ch_node), error);
+ return error;
+ }
+
+ *enable = 0;
+
+ for (i = 0; i < count; i++) {
+ if (val[i] >= IQS626_NUM_CRx_TX) {
+ dev_err(&client->dev,
+ "Invalid %s channel CRX/TX pin: %u\n",
+ fwnode_get_name(ch_node), val[i]);
+ return -EINVAL;
+ }
+
+ *enable |= BIT(val[i]);
+ }
+
+ return 0;
+}
+
+static int iqs626_parse_trackpad(struct iqs626_private *iqs626,
+ const struct fwnode_handle *ch_node)
+{
+ struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
+ struct i2c_client *client = iqs626->client;
+ u8 *hyst = &sys_reg->tp_grp_reg.hyst;
+ unsigned int val;
+ int error, count;
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,lta-update", &val)) {
+ if (val > IQS626_MISC_A_TPx_LTA_UPDATE_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel update rate: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ sys_reg->misc_a &= ~IQS626_MISC_A_TPx_LTA_UPDATE_MASK;
+ sys_reg->misc_a |= (val << IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT);
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-trackpad",
+ &val)) {
+ if (val > IQS626_FILT_STR_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel filter strength: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ sys_reg->misc_b &= ~IQS626_MISC_B_FILT_STR_TPx;
+ sys_reg->misc_b |= val;
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-cnt",
+ &val)) {
+ if (val > IQS626_FILT_STR_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel filter strength: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *hyst &= ~IQS626_FILT_STR_NP_TPx_MASK;
+ *hyst |= (val << IQS626_FILT_STR_NP_TPx_SHIFT);
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-cnt",
+ &val)) {
+ if (val > IQS626_FILT_STR_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel filter strength: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *hyst &= ~IQS626_FILT_STR_LP_TPx_MASK;
+ *hyst |= (val << IQS626_FILT_STR_LP_TPx_SHIFT);
+ }
+
+ if (!fwnode_property_present(ch_node, "linux,keycodes"))
+ return 0;
+
+ count = fwnode_property_count_u32(ch_node, "linux,keycodes");
+ if (count > IQS626_NUM_GESTURES) {
+ 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 = fwnode_property_read_u32_array(ch_node, "linux,keycodes",
+ iqs626->tp_code, count);
+ if (error) {
+ dev_err(&client->dev, "Failed to read keycodes: %d\n", error);
+ return error;
+ }
+
+ sys_reg->misc_b &= ~IQS626_MISC_B_TPx_SWIPE;
+ if (fwnode_property_present(ch_node, "azoteq,gesture-swipe"))
+ sys_reg->misc_b |= IQS626_MISC_B_TPx_SWIPE;
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,timeout-tap-ms",
+ &val)) {
+ if (val > IQS626_TIMEOUT_TAP_MS_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel timeout: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ sys_reg->timeout_tap = val / 16;
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,timeout-swipe-ms",
+ &val)) {
+ if (val > IQS626_TIMEOUT_SWIPE_MS_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel timeout: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ sys_reg->timeout_swipe = val / 16;
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,thresh-swipe",
+ &val)) {
+ if (val > IQS626_THRESH_SWIPE_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel threshold: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ sys_reg->thresh_swipe = val;
+ }
+
+ sys_reg->event_mask &= ~IQS626_EVENT_MASK_GESTURE;
+
+ return 0;
+}
+
+static int iqs626_parse_channel(struct iqs626_private *iqs626,
+ const struct fwnode_handle *ch_node,
+ enum iqs626_ch_id ch_id)
+{
+ struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
+ struct i2c_client *client = iqs626->client;
+ u8 *engine, *filter, *rx_enable, *tx_enable;
+ u8 *assoc_select, *assoc_weight;
+ unsigned int val;
+ int error, i;
+
+ switch (ch_id) {
+ case IQS626_CH_ULP_0:
+ engine = sys_reg->ch_reg_ulp.engine;
+ break;
+
+ case IQS626_CH_TP_2:
+ case IQS626_CH_TP_3:
+ engine = sys_reg->tp_grp_reg.engine;
+ break;
+
+ case IQS626_CH_GEN_0:
+ case IQS626_CH_GEN_1:
+ case IQS626_CH_GEN_2:
+ i = ch_id - IQS626_CH_GEN_0;
+ engine = sys_reg->ch_reg_gen[i].engine;
+ break;
+
+ case IQS626_CH_HALL:
+ engine = &sys_reg->ch_reg_hall.engine;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ *engine |= IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
+ if (fwnode_property_present(ch_node, "azoteq,meas-cap-decrease"))
+ *engine &= ~IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
+
+ *engine |= IQS626_CHx_ENG_0_RX_TERM_VSS;
+ if (!fwnode_property_read_u32(ch_node, "azoteq,rx-inactive", &val)) {
+ switch (val) {
+ case IQS626_RX_INACTIVE_VSS:
+ break;
+
+ case IQS626_RX_INACTIVE_FLOAT:
+ *engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
+ if (ch_id == IQS626_CH_GEN_0 ||
+ ch_id == IQS626_CH_GEN_1 ||
+ ch_id == IQS626_CH_GEN_2)
+ *(engine + 4) &= ~IQS626_CHx_ENG_4_RX_TERM_VREG;
+ break;
+
+ case IQS626_RX_INACTIVE_VREG:
+ if (ch_id == IQS626_CH_GEN_0 ||
+ ch_id == IQS626_CH_GEN_1 ||
+ ch_id == IQS626_CH_GEN_2) {
+ *engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
+ *(engine + 4) |= IQS626_CHx_ENG_4_RX_TERM_VREG;
+ break;
+ }
+ fallthrough;
+
+ default:
+ dev_err(&client->dev,
+ "Invalid %s channel CRX pin termination: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+ }
+
+ *engine &= ~IQS626_CHx_ENG_0_LINEARIZE;
+ if (fwnode_property_present(ch_node, "azoteq,linearize"))
+ *engine |= IQS626_CHx_ENG_0_LINEARIZE;
+
+ *engine &= ~IQS626_CHx_ENG_0_DUAL_DIR;
+ if (fwnode_property_present(ch_node, "azoteq,dual-direction"))
+ *engine |= IQS626_CHx_ENG_0_DUAL_DIR;
+
+ *engine &= ~IQS626_CHx_ENG_0_FILT_DISABLE;
+ if (fwnode_property_present(ch_node, "azoteq,filt-disable"))
+ *engine |= IQS626_CHx_ENG_0_FILT_DISABLE;
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,ati-mode", &val)) {
+ if (val > IQS626_CHx_ENG_0_ATI_MODE_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel ATI mode: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *engine &= ~IQS626_CHx_ENG_0_ATI_MODE_MASK;
+ *engine |= val;
+ }
+
+ if (ch_id == IQS626_CH_HALL)
+ return 0;
+
+ *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_ENABLE;
+ if (!fwnode_property_read_u32(ch_node, "azoteq,cct-increase",
+ &val) && val) {
+ unsigned int orig_val = val--;
+
+ /*
+ * In the case of the generic channels, the charge cycle time
+ * field doubles in size and straddles two separate registers.
+ */
+ if (ch_id == IQS626_CH_GEN_0 ||
+ ch_id == IQS626_CH_GEN_1 ||
+ ch_id == IQS626_CH_GEN_2) {
+ *(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_1;
+ if (val & BIT(1))
+ *(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_1;
+
+ *(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_0;
+ if (val & BIT(0))
+ *(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_0;
+
+ val >>= 2;
+ }
+
+ if (val & ~GENMASK(1, 0)) {
+ dev_err(&client->dev,
+ "Invalid %s channel charge cycle time: %u\n",
+ fwnode_get_name(ch_node), orig_val);
+ return -EINVAL;
+ }
+
+ *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_1;
+ if (val & BIT(1))
+ *(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_1;
+
+ *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_0;
+ if (val & BIT(0))
+ *(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_0;
+
+ *(engine + 1) |= IQS626_CHx_ENG_1_CCT_ENABLE;
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,proj-bias", &val)) {
+ if (val > IQS626_CHx_ENG_1_PROJ_BIAS_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel bias current: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *(engine + 1) &= ~IQS626_CHx_ENG_1_PROJ_BIAS_MASK;
+ *(engine + 1) |= (val << IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT);
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,sense-freq", &val)) {
+ if (val > IQS626_CHx_ENG_1_SENSE_FREQ_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel sensing frequency: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *(engine + 1) &= ~IQS626_CHx_ENG_1_SENSE_FREQ_MASK;
+ *(engine + 1) |= (val << IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT);
+ }
+
+ *(engine + 1) &= ~IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
+ if (fwnode_property_present(ch_node, "azoteq,ati-band-tighten"))
+ *(engine + 1) |= IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
+
+ if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3)
+ return iqs626_parse_trackpad(iqs626, ch_node);
+
+ if (ch_id == IQS626_CH_ULP_0) {
+ sys_reg->ch_reg_ulp.hyst &= ~IQS626_ULP_PROJ_ENABLE;
+ if (fwnode_property_present(ch_node, "azoteq,proj-enable"))
+ sys_reg->ch_reg_ulp.hyst |= IQS626_ULP_PROJ_ENABLE;
+
+ filter = &sys_reg->ch_reg_ulp.filter;
+
+ rx_enable = &sys_reg->ch_reg_ulp.rx_enable;
+ tx_enable = &sys_reg->ch_reg_ulp.tx_enable;
+ } else {
+ i = ch_id - IQS626_CH_GEN_0;
+ filter = &sys_reg->ch_reg_gen[i].filter;
+
+ rx_enable = &sys_reg->ch_reg_gen[i].rx_enable;
+ tx_enable = &sys_reg->ch_reg_gen[i].tx_enable;
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-cnt",
+ &val)) {
+ if (val > IQS626_FILT_STR_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel filter strength: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *filter &= ~IQS626_FILT_STR_NP_CNT_MASK;
+ *filter |= (val << IQS626_FILT_STR_NP_CNT_SHIFT);
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-cnt",
+ &val)) {
+ if (val > IQS626_FILT_STR_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel filter strength: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *filter &= ~IQS626_FILT_STR_LP_CNT_MASK;
+ *filter |= (val << IQS626_FILT_STR_LP_CNT_SHIFT);
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-lta",
+ &val)) {
+ if (val > IQS626_FILT_STR_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel filter strength: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *filter &= ~IQS626_FILT_STR_NP_LTA_MASK;
+ *filter |= (val << IQS626_FILT_STR_NP_LTA_SHIFT);
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-lta",
+ &val)) {
+ if (val > IQS626_FILT_STR_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel filter strength: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *filter &= ~IQS626_FILT_STR_LP_LTA_MASK;
+ *filter |= val;
+ }
+
+ error = iqs626_parse_pins(iqs626, ch_node, "azoteq,rx-enable",
+ rx_enable);
+ if (error)
+ return error;
+
+ error = iqs626_parse_pins(iqs626, ch_node, "azoteq,tx-enable",
+ tx_enable);
+ if (error)
+ return error;
+
+ if (ch_id == IQS626_CH_ULP_0)
+ return 0;
+
+ *(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
+ if (!fwnode_property_read_u32(ch_node, "azoteq,local-cap-size",
+ &val) && val) {
+ unsigned int orig_val = val--;
+
+ if (val > IQS626_CHx_ENG_2_LOCAL_CAP_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel local cap. size: %u\n",
+ fwnode_get_name(ch_node), orig_val);
+ return -EINVAL;
+ }
+
+ *(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_MASK;
+ *(engine + 2) |= (val << IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT);
+
+ *(engine + 2) |= IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,sense-mode", &val)) {
+ if (val > IQS626_CHx_ENG_2_SENSE_MODE_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel sensing mode: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *(engine + 2) &= ~IQS626_CHx_ENG_2_SENSE_MODE_MASK;
+ *(engine + 2) |= val;
+ }
+
+ if (!fwnode_property_read_u32(ch_node, "azoteq,tx-freq", &val)) {
+ if (val > IQS626_CHx_ENG_3_TX_FREQ_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel excitation frequency: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *(engine + 3) &= ~IQS626_CHx_ENG_3_TX_FREQ_MASK;
+ *(engine + 3) |= (val << IQS626_CHx_ENG_3_TX_FREQ_SHIFT);
+ }
+
+ *(engine + 3) &= ~IQS626_CHx_ENG_3_INV_LOGIC;
+ if (fwnode_property_present(ch_node, "azoteq,invert-enable"))
+ *(engine + 3) |= IQS626_CHx_ENG_3_INV_LOGIC;
+
+ *(engine + 4) &= ~IQS626_CHx_ENG_4_COMP_DISABLE;
+ if (fwnode_property_present(ch_node, "azoteq,comp-disable"))
+ *(engine + 4) |= IQS626_CHx_ENG_4_COMP_DISABLE;
+
+ *(engine + 4) &= ~IQS626_CHx_ENG_4_STATIC_ENABLE;
+ if (fwnode_property_present(ch_node, "azoteq,static-enable"))
+ *(engine + 4) |= IQS626_CHx_ENG_4_STATIC_ENABLE;
+
+ i = ch_id - IQS626_CH_GEN_0;
+ assoc_select = &sys_reg->ch_reg_gen[i].assoc_select;
+ assoc_weight = &sys_reg->ch_reg_gen[i].assoc_weight;
+
+ *assoc_select = 0;
+ if (!fwnode_property_present(ch_node, "azoteq,assoc-select"))
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
+ if (fwnode_property_match_string(ch_node, "azoteq,assoc-select",
+ iqs626_channels[i].name) < 0)
+ continue;
+
+ *assoc_select |= iqs626_channels[i].active;
+ }
+
+ if (fwnode_property_read_u32(ch_node, "azoteq,assoc-weight", &val))
+ return 0;
+
+ if (val > IQS626_GEN_WEIGHT_MAX) {
+ dev_err(&client->dev,
+ "Invalid %s channel associated weight: %u\n",
+ fwnode_get_name(ch_node), val);
+ return -EINVAL;
+ }
+
+ *assoc_weight = val;
+
+ return 0;
+}
+
+static int iqs626_parse_prop(struct iqs626_private *iqs626)
+{
+ struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
+ struct i2c_client *client = iqs626->client;
+ struct fwnode_handle *ch_node;
+ unsigned int val;
+ int error, i;
+ u16 general;
+
+ if (!device_property_read_u32(&client->dev, "azoteq,suspend-mode",
+ &val)) {
+ if (val > IQS626_SYS_SETTINGS_PWR_MODE_MAX) {
+ dev_err(&client->dev, "Invalid suspend mode: %u\n",
+ val);
+ return -EINVAL;
+ }
+
+ iqs626->suspend_mode = val;
+ }
+
+ error = regmap_raw_read(iqs626->regmap, IQS626_SYS_SETTINGS, sys_reg,
+ sizeof(*sys_reg));
+ if (error)
+ return error;
+
+ general = be16_to_cpu(sys_reg->general);
+ general &= IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
+
+ if (device_property_present(&client->dev, "azoteq,clk-div"))
+ general |= IQS626_SYS_SETTINGS_CLK_DIV;
+
+ if (device_property_present(&client->dev, "azoteq,ulp-enable"))
+ general |= IQS626_SYS_SETTINGS_ULP_AUTO;
+
+ if (!device_property_read_u32(&client->dev, "azoteq,ulp-update",
+ &val)) {
+ if (val > IQS626_SYS_SETTINGS_ULP_UPDATE_MAX) {
+ dev_err(&client->dev, "Invalid update rate: %u\n", val);
+ return -EINVAL;
+ }
+
+ general &= ~IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
+ general |= (val << IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT);
+ }
+
+ sys_reg->misc_a &= ~IQS626_MISC_A_ATI_BAND_DISABLE;
+ if (device_property_present(&client->dev, "azoteq,ati-band-disable"))
+ sys_reg->misc_a |= IQS626_MISC_A_ATI_BAND_DISABLE;
+
+ sys_reg->misc_a &= ~IQS626_MISC_A_ATI_LP_ONLY;
+ if (device_property_present(&client->dev, "azoteq,ati-lp-only"))
+ sys_reg->misc_a |= IQS626_MISC_A_ATI_LP_ONLY;
+
+ if (!device_property_read_u32(&client->dev, "azoteq,gpio3-select",
+ &val)) {
+ if (val > IQS626_MISC_A_GPIO3_SELECT_MAX) {
+ dev_err(&client->dev, "Invalid GPIO3 selection: %u\n",
+ val);
+ return -EINVAL;
+ }
+
+ sys_reg->misc_a &= ~IQS626_MISC_A_GPIO3_SELECT_MASK;
+ sys_reg->misc_a |= val;
+ }
+
+ if (!device_property_read_u32(&client->dev, "azoteq,reseed-select",
+ &val)) {
+ if (val > IQS626_MISC_B_RESEED_UI_SEL_MAX) {
+ dev_err(&client->dev, "Invalid reseed selection: %u\n",
+ val);
+ return -EINVAL;
+ }
+
+ sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_UI_SEL_MASK;
+ sys_reg->misc_b |= (val << IQS626_MISC_B_RESEED_UI_SEL_SHIFT);
+ }
+
+ sys_reg->misc_b &= ~IQS626_MISC_B_THRESH_EXTEND;
+ if (device_property_present(&client->dev, "azoteq,thresh-extend"))
+ sys_reg->misc_b |= IQS626_MISC_B_THRESH_EXTEND;
+
+ sys_reg->misc_b &= ~IQS626_MISC_B_TRACKING_UI_ENABLE;
+ if (device_property_present(&client->dev, "azoteq,tracking-enable"))
+ sys_reg->misc_b |= IQS626_MISC_B_TRACKING_UI_ENABLE;
+
+ sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_OFFSET;
+ if (device_property_present(&client->dev, "azoteq,reseed-offset"))
+ sys_reg->misc_b |= IQS626_MISC_B_RESEED_OFFSET;
+
+ if (!device_property_read_u32(&client->dev, "azoteq,rate-np-ms",
+ &val)) {
+ if (val > IQS626_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 > IQS626_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 > IQS626_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 > IQS626_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 > IQS626_TIMEOUT_LTA_MS_MAX) {
+ dev_err(&client->dev, "Invalid timeout: %u\n", val);
+ return -EINVAL;
+ }
+
+ sys_reg->timeout_lta = val / 512;
+ }
+
+ sys_reg->event_mask = ~((u8)IQS626_EVENT_MASK_SYS);
+ sys_reg->redo_ati = 0;
+
+ sys_reg->reseed = 0;
+ sys_reg->active = 0;
+
+ for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
+ ch_node = device_get_named_child_node(&client->dev,
+ iqs626_channels[i].name);
+ if (!ch_node)
+ continue;
+
+ error = iqs626_parse_channel(iqs626, ch_node, i);
+ if (error)
+ return error;
+
+ error = iqs626_parse_ati_target(iqs626, ch_node, i);
+ if (error)
+ return error;
+
+ error = iqs626_parse_events(iqs626, ch_node, i);
+ if (error)
+ return error;
+
+ if (!fwnode_property_present(ch_node, "azoteq,ati-exclude"))
+ sys_reg->redo_ati |= iqs626_channels[i].active;
+
+ if (!fwnode_property_present(ch_node, "azoteq,reseed-disable"))
+ sys_reg->reseed |= iqs626_channels[i].active;
+
+ sys_reg->active |= iqs626_channels[i].active;
+ }
+
+ general |= IQS626_SYS_SETTINGS_EVENT_MODE;
+
+ /*
+ * Enable streaming during normal-power mode if the trackpad is used to
+ * report raw coordinates instead of gestures. In that case, the device
+ * returns to event mode during low-power mode.
+ */
+ if (sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active &&
+ sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE)
+ general |= IQS626_SYS_SETTINGS_EVENT_MODE_LP;
+
+ general |= IQS626_SYS_SETTINGS_REDO_ATI;
+ general |= IQS626_SYS_SETTINGS_ACK_RESET;
+
+ sys_reg->general = cpu_to_be16(general);
+
+ error = regmap_raw_write(iqs626->regmap, IQS626_SYS_SETTINGS,
+ &iqs626->sys_reg, sizeof(iqs626->sys_reg));
+ if (error)
+ return error;
+
+ iqs626_irq_wait();
+
+ return 0;
+}
+
+static int iqs626_input_init(struct iqs626_private *iqs626)
+{
+ struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
+ struct i2c_client *client = iqs626->client;
+ int error, i, j;
+
+ iqs626->keypad = devm_input_allocate_device(&client->dev);
+ if (!iqs626->keypad)
+ return -ENOMEM;
+
+ iqs626->keypad->keycodemax = ARRAY_SIZE(iqs626->kp_code);
+ iqs626->keypad->keycode = iqs626->kp_code;
+ iqs626->keypad->keycodesize = sizeof(**iqs626->kp_code);
+
+ iqs626->keypad->name = "iqs626a_keypad";
+ iqs626->keypad->id.bustype = BUS_I2C;
+
+ for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
+ if (!(sys_reg->active & iqs626_channels[i].active))
+ continue;
+
+ for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
+ if (!iqs626->kp_type[i][j])
+ continue;
+
+ input_set_capability(iqs626->keypad,
+ iqs626->kp_type[i][j],
+ iqs626->kp_code[i][j]);
+ }
+ }
+
+ if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
+ return 0;
+
+ iqs626->trackpad = devm_input_allocate_device(&client->dev);
+ if (!iqs626->trackpad)
+ return -ENOMEM;
+
+ iqs626->trackpad->keycodemax = ARRAY_SIZE(iqs626->tp_code);
+ iqs626->trackpad->keycode = iqs626->tp_code;
+ iqs626->trackpad->keycodesize = sizeof(*iqs626->tp_code);
+
+ iqs626->trackpad->name = "iqs626a_trackpad";
+ iqs626->trackpad->id.bustype = BUS_I2C;
+
+ /*
+ * Present the trackpad as a traditional pointing device if no gestures
+ * have been mapped to a keycode.
+ */
+ if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
+ u8 tp_mask = iqs626_channels[IQS626_CH_TP_3].active;
+
+ input_set_capability(iqs626->trackpad, EV_KEY, BTN_TOUCH);
+ input_set_abs_params(iqs626->trackpad, ABS_Y, 0, 255, 0, 0);
+
+ if ((sys_reg->active & tp_mask) == tp_mask)
+ input_set_abs_params(iqs626->trackpad,
+ ABS_X, 0, 255, 0, 0);
+ else
+ input_set_abs_params(iqs626->trackpad,
+ ABS_X, 0, 128, 0, 0);
+
+ touchscreen_parse_properties(iqs626->trackpad, false,
+ &iqs626->prop);
+ } else {
+ for (i = 0; i < IQS626_NUM_GESTURES; i++)
+ if (iqs626->tp_code[i] != KEY_RESERVED)
+ input_set_capability(iqs626->trackpad, EV_KEY,
+ iqs626->tp_code[i]);
+ }
+
+ error = input_register_device(iqs626->trackpad);
+ if (error)
+ dev_err(&client->dev, "Failed to register trackpad: %d\n",
+ error);
+
+ return error;
+}
+
+static int iqs626_report(struct iqs626_private *iqs626)
+{
+ struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
+ struct i2c_client *client = iqs626->client;
+ struct iqs626_flags flags;
+ __le16 hall_output;
+ int error, i, j;
+ u8 state;
+ u8 *dir_mask = &flags.states[IQS626_ST_OFFS_DIR];
+
+ error = regmap_raw_read(iqs626->regmap, IQS626_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) & IQS626_SYS_FLAGS_SHOW_RESET) {
+ dev_err(&client->dev, "Unexpected device reset\n");
+
+ error = regmap_raw_write(iqs626->regmap, IQS626_SYS_SETTINGS,
+ sys_reg, sizeof(*sys_reg));
+ if (error)
+ dev_err(&client->dev,
+ "Failed to re-initialize device: %d\n", error);
+
+ return error;
+ }
+
+ if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_IN_ATI)
+ return 0;
+
+ /*
+ * Unlike the ULP or generic channels, the Hall channel does not have a
+ * direction flag. Instead, the direction (i.e. magnet polarity) can be
+ * derived based on the sign of the 2's complement differential output.
+ */
+ if (sys_reg->active & iqs626_channels[IQS626_CH_HALL].active) {
+ error = regmap_raw_read(iqs626->regmap, IQS626_HALL_OUTPUT,
+ &hall_output, sizeof(hall_output));
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to read Hall output: %d\n", error);
+ return error;
+ }
+
+ *dir_mask &= ~iqs626_channels[IQS626_CH_HALL].active;
+ if (le16_to_cpu(hall_output) < 0x8000)
+ *dir_mask |= iqs626_channels[IQS626_CH_HALL].active;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
+ if (!(sys_reg->active & iqs626_channels[i].active))
+ continue;
+
+ for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
+ if (!iqs626->kp_type[i][j])
+ continue;
+
+ state = flags.states[iqs626_events[j].st_offs];
+ state &= iqs626_events[j].dir_up ? *dir_mask
+ : ~(*dir_mask);
+ state &= iqs626_channels[i].active;
+
+ input_event(iqs626->keypad, iqs626->kp_type[i][j],
+ iqs626->kp_code[i][j], !!state);
+ }
+ }
+
+ input_sync(iqs626->keypad);
+
+ /*
+ * The following completion signals that ATI has finished, any initial
+ * switch states have been reported and the keypad can be registered.
+ */
+ complete_all(&iqs626->ati_done);
+
+ if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
+ return 0;
+
+ if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
+ state = flags.states[IQS626_ST_OFFS_TOUCH];
+ state &= iqs626_channels[IQS626_CH_TP_2].active;
+
+ input_report_key(iqs626->trackpad, BTN_TOUCH, state);
+
+ if (state)
+ touchscreen_report_pos(iqs626->trackpad, &iqs626->prop,
+ flags.trackpad_x,
+ flags.trackpad_y, false);
+ } else {
+ for (i = 0; i < IQS626_NUM_GESTURES; i++)
+ input_report_key(iqs626->trackpad, iqs626->tp_code[i],
+ flags.gesture & BIT(i));
+
+ if (flags.gesture & GENMASK(IQS626_GESTURE_TAP, 0)) {
+ input_sync(iqs626->trackpad);
+
+ /*
+ * Momentary gestures are followed by a complementary
+ * release cycle so as to emulate a full keystroke.
+ */
+ for (i = 0; i < IQS626_GESTURE_HOLD; i++)
+ input_report_key(iqs626->trackpad,
+ iqs626->tp_code[i], 0);
+ }
+ }
+
+ input_sync(iqs626->trackpad);
+
+ return 0;
+}
+
+static irqreturn_t iqs626_irq(int irq, void *context)
+{
+ struct iqs626_private *iqs626 = context;
+
+ if (iqs626_report(iqs626))
+ 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.
+ */
+ iqs626_irq_wait();
+
+ return IRQ_HANDLED;
+}
+
+static const struct regmap_config iqs626_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .max_register = IQS626_MAX_REG,
+};
+
+static int iqs626_probe(struct i2c_client *client)
+{
+ struct iqs626_ver_info ver_info;
+ struct iqs626_private *iqs626;
+ int error;
+
+ iqs626 = devm_kzalloc(&client->dev, sizeof(*iqs626), GFP_KERNEL);
+ if (!iqs626)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, iqs626);
+ iqs626->client = client;
+
+ iqs626->regmap = devm_regmap_init_i2c(client, &iqs626_regmap_config);
+ if (IS_ERR(iqs626->regmap)) {
+ error = PTR_ERR(iqs626->regmap);
+ dev_err(&client->dev, "Failed to initialize register map: %d\n",
+ error);
+ return error;
+ }
+
+ init_completion(&iqs626->ati_done);
+
+ error = regmap_raw_read(iqs626->regmap, IQS626_VER_INFO, &ver_info,
+ sizeof(ver_info));
+ if (error)
+ return error;
+
+ if (ver_info.prod_num != IQS626_VER_INFO_PROD_NUM) {
+ dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
+ ver_info.prod_num);
+ return -EINVAL;
+ }
+
+ error = iqs626_parse_prop(iqs626);
+ if (error)
+ return error;
+
+ error = iqs626_input_init(iqs626);
+ if (error)
+ return error;
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, iqs626_irq, IRQF_ONESHOT,
+ client->name, iqs626);
+ if (error) {
+ dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
+ return error;
+ }
+
+ if (!wait_for_completion_timeout(&iqs626->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(iqs626->keypad);
+ if (error)
+ dev_err(&client->dev, "Failed to register keypad: %d\n", error);
+
+ return error;
+}
+
+static int __maybe_unused iqs626_suspend(struct device *dev)
+{
+ struct iqs626_private *iqs626 = dev_get_drvdata(dev);
+ struct i2c_client *client = iqs626->client;
+ unsigned int val;
+ int error;
+
+ if (!iqs626->suspend_mode)
+ return 0;
+
+ disable_irq(client->irq);
+
+ /*
+ * Automatic power mode switching must be disabled before the device is
+ * forced into any particular power mode. In this case, the device will
+ * transition into normal-power mode.
+ */
+ error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
+ IQS626_SYS_SETTINGS_DIS_AUTO, ~0);
+ if (error)
+ goto err_irq;
+
+ /*
+ * The following check ensures the device has completed its transition
+ * into normal-power mode before a manual mode switch is performed.
+ */
+ error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
+ !(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
+ IQS626_PWR_MODE_POLL_SLEEP_US,
+ IQS626_PWR_MODE_POLL_TIMEOUT_US);
+ if (error)
+ goto err_irq;
+
+ error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
+ IQS626_SYS_SETTINGS_PWR_MODE_MASK,
+ iqs626->suspend_mode <<
+ IQS626_SYS_SETTINGS_PWR_MODE_SHIFT);
+ if (error)
+ goto err_irq;
+
+ /*
+ * This last check ensures the device has completed its transition into
+ * the desired power mode to prevent any spurious interrupts from being
+ * triggered after iqs626_suspend has already returned.
+ */
+ error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
+ (val & IQS626_SYS_FLAGS_PWR_MODE_MASK)
+ == (iqs626->suspend_mode <<
+ IQS626_SYS_FLAGS_PWR_MODE_SHIFT),
+ IQS626_PWR_MODE_POLL_SLEEP_US,
+ IQS626_PWR_MODE_POLL_TIMEOUT_US);
+
+err_irq:
+ iqs626_irq_wait();
+ enable_irq(client->irq);
+
+ return error;
+}
+
+static int __maybe_unused iqs626_resume(struct device *dev)
+{
+ struct iqs626_private *iqs626 = dev_get_drvdata(dev);
+ struct i2c_client *client = iqs626->client;
+ unsigned int val;
+ int error;
+
+ if (!iqs626->suspend_mode)
+ return 0;
+
+ disable_irq(client->irq);
+
+ error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
+ IQS626_SYS_SETTINGS_PWR_MODE_MASK, 0);
+ if (error)
+ goto err_irq;
+
+ /*
+ * This check ensures the device has returned to normal-power mode
+ * before automatic power mode switching is re-enabled.
+ */
+ error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
+ !(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
+ IQS626_PWR_MODE_POLL_SLEEP_US,
+ IQS626_PWR_MODE_POLL_TIMEOUT_US);
+ if (error)
+ goto err_irq;
+
+ error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
+ IQS626_SYS_SETTINGS_DIS_AUTO, 0);
+ if (error)
+ goto err_irq;
+
+ /*
+ * This step reports any events that may have been "swallowed" as a
+ * result of polling PWR_MODE (which automatically acknowledges any
+ * pending interrupts).
+ */
+ error = iqs626_report(iqs626);
+
+err_irq:
+ iqs626_irq_wait();
+ enable_irq(client->irq);
+
+ return error;
+}
+
+static SIMPLE_DEV_PM_OPS(iqs626_pm, iqs626_suspend, iqs626_resume);
+
+static const struct of_device_id iqs626_of_match[] = {
+ { .compatible = "azoteq,iqs626a" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, iqs626_of_match);
+
+static struct i2c_driver iqs626_i2c_driver = {
+ .driver = {
+ .name = "iqs626a",
+ .of_match_table = iqs626_of_match,
+ .pm = &iqs626_pm,
+ },
+ .probe_new = iqs626_probe,
+};
+module_i2c_driver(iqs626_i2c_driver);
+
+MODULE_AUTHOR("Jeff LaBundy <jeff@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Azoteq IQS626A Capacitive Touch Controller");
+MODULE_LICENSE("GPL");
--
2.7.4
