On Mon, Apr 15, 2019 at 06:56:55PM +0200, Marco Felsch wrote:
> Add initial support for the AT42QT1050 (QT1050) device. The device
> supports up to five input keys, dependent on the mode. Since it adds only
> the initial support the "1 to 4 keys plus Guard Channel" mode isn't
> support.
>
> Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
Applied, thank you.
> ---
> Changes:
>
> v3
> - switch to new i2c probe_new function and drop id_table
> - seperate devm_kzalloc() error checks
> - don't set IRQF_TRIGGER_NONE
> - drop enable/disable_irq_wake() since it is done by the i2c-core
> - fix pm_suspend: disable the chip only if it isn't a wakeup-source
> else we can't receive a wakeup.
> - fix MODULE_LICENSE to point to correct 'GPL v2' version
> - fix copyright info
> - use __maybe_unused to drop CONFIG_OF ifdef
> - switch to static key allocation to avoid double looping during irq
> and simplfy the code a bit
> - make use of QT1050_MAX_KEYS macro
> - unifrom comments (always start with capital letter)
> - fix error handling during device_for_each_child_node()
>
> v2
> - drop static key array allocation
> - drop OF dependencies
> - change fw-layout, so each key is represented by a fw-subnode
> - use qt1050_key_regs_data array to specify button <-> register pairs
>
> drivers/input/keyboard/Kconfig | 11 +
> drivers/input/keyboard/Makefile | 1 +
> drivers/input/keyboard/qt1050.c | 597 ++++++++++++++++++++++++++++++++
> 3 files changed, 609 insertions(+)
> create mode 100644 drivers/input/keyboard/qt1050.c
>
> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
> index a878351f1643..377c0161918b 100644
> --- a/drivers/input/keyboard/Kconfig
> +++ b/drivers/input/keyboard/Kconfig
> @@ -137,6 +137,17 @@ config KEYBOARD_ATKBD_RDI_KEYCODES
> right-hand column will be interpreted as the key shown in the
> left-hand column.
>
> +config KEYBOARD_QT1050
> + tristate "Microchip AT42QT1050 Touch Sensor Chip"
> + depends on I2C
> + select REGMAP_I2C
> + help
> + Say Y here if you want to use Microchip AT42QT1050 QTouch
> + Sensor chip as input device.
> +
> + To compile this driver as a module, choose M here:
> + the module will be called qt1050
> +
> config KEYBOARD_QT1070
> tristate "Atmel AT42QT1070 Touch Sensor Chip"
> depends on I2C
> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
> index 182e92985dbf..f0291ca39f62 100644
> --- a/drivers/input/keyboard/Makefile
> +++ b/drivers/input/keyboard/Makefile
> @@ -50,6 +50,7 @@ obj-$(CONFIG_KEYBOARD_OPENCORES) += opencores-kbd.o
> obj-$(CONFIG_KEYBOARD_PMIC8XXX) += pmic8xxx-keypad.o
> obj-$(CONFIG_KEYBOARD_PXA27x) += pxa27x_keypad.o
> obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o
> +obj-$(CONFIG_KEYBOARD_QT1050) += qt1050.o
> obj-$(CONFIG_KEYBOARD_QT1070) += qt1070.o
> obj-$(CONFIG_KEYBOARD_QT2160) += qt2160.o
> obj-$(CONFIG_KEYBOARD_SAMSUNG) += samsung-keypad.o
> diff --git a/drivers/input/keyboard/qt1050.c b/drivers/input/keyboard/qt1050.c
> new file mode 100644
> index 000000000000..2a816efdedbc
> --- /dev/null
> +++ b/drivers/input/keyboard/qt1050.c
> @@ -0,0 +1,597 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Microchip AT42QT1050 QTouch Sensor Controller
> + *
> + * Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@xxxxxxxxxxxxxx>
> + *
> + * Base on AT42QT1070 driver by:
> + * Bo Shen <voice.shen@xxxxxxxxx>
> + * Copyright (C) 2011 Atmel
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/log2.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/regmap.h>
> +
> +/* Chip ID */
> +#define QT1050_CHIP_ID 0x00
> +#define QT1050_CHIP_ID_VER 0x46
> +
> +/* Firmware version */
> +#define QT1050_FW_VERSION 0x01
> +
> +/* Detection status */
> +#define QT1050_DET_STATUS 0x02
> +
> +/* Key status */
> +#define QT1050_KEY_STATUS 0x03
> +
> +/* Key Signals */
> +#define QT1050_KEY_SIGNAL_0_MSB 0x06
> +#define QT1050_KEY_SIGNAL_0_LSB 0x07
> +#define QT1050_KEY_SIGNAL_1_MSB 0x08
> +#define QT1050_KEY_SIGNAL_1_LSB 0x09
> +#define QT1050_KEY_SIGNAL_2_MSB 0x0c
> +#define QT1050_KEY_SIGNAL_2_LSB 0x0d
> +#define QT1050_KEY_SIGNAL_3_MSB 0x0e
> +#define QT1050_KEY_SIGNAL_3_LSB 0x0f
> +#define QT1050_KEY_SIGNAL_4_MSB 0x10
> +#define QT1050_KEY_SIGNAL_4_LSB 0x11
> +
> +/* Reference data */
> +#define QT1050_REF_DATA_0_MSB 0x14
> +#define QT1050_REF_DATA_0_LSB 0x15
> +#define QT1050_REF_DATA_1_MSB 0x16
> +#define QT1050_REF_DATA_1_LSB 0x17
> +#define QT1050_REF_DATA_2_MSB 0x1a
> +#define QT1050_REF_DATA_2_LSB 0x1b
> +#define QT1050_REF_DATA_3_MSB 0x1c
> +#define QT1050_REF_DATA_3_LSB 0x1d
> +#define QT1050_REF_DATA_4_MSB 0x1e
> +#define QT1050_REF_DATA_4_LSB 0x1f
> +
> +/* Negative threshold level */
> +#define QT1050_NTHR_0 0x21
> +#define QT1050_NTHR_1 0x22
> +#define QT1050_NTHR_2 0x24
> +#define QT1050_NTHR_3 0x25
> +#define QT1050_NTHR_4 0x26
> +
> +/* Pulse / Scale */
> +#define QT1050_PULSE_SCALE_0 0x28
> +#define QT1050_PULSE_SCALE_1 0x29
> +#define QT1050_PULSE_SCALE_2 0x2b
> +#define QT1050_PULSE_SCALE_3 0x2c
> +#define QT1050_PULSE_SCALE_4 0x2d
> +
> +/* Detection integrator counter / AKS */
> +#define QT1050_DI_AKS_0 0x2f
> +#define QT1050_DI_AKS_1 0x30
> +#define QT1050_DI_AKS_2 0x32
> +#define QT1050_DI_AKS_3 0x33
> +#define QT1050_DI_AKS_4 0x34
> +
> +/* Charge Share Delay */
> +#define QT1050_CSD_0 0x36
> +#define QT1050_CSD_1 0x37
> +#define QT1050_CSD_2 0x39
> +#define QT1050_CSD_3 0x3a
> +#define QT1050_CSD_4 0x3b
> +
> +/* Low Power Mode */
> +#define QT1050_LPMODE 0x3d
> +
> +/* Calibration and Reset */
> +#define QT1050_RES_CAL 0x3f
> +#define QT1050_RES_CAL_RESET BIT(7)
> +#define QT1050_RES_CAL_CALIBRATE BIT(1)
> +
> +#define QT1050_MAX_KEYS 5
> +#define QT1050_RESET_TIME 255
> +
> +struct qt1050_key_regs {
> + unsigned int nthr;
> + unsigned int pulse_scale;
> + unsigned int di_aks;
> + unsigned int csd;
> +};
> +
> +struct qt1050_key {
> + int num;
> + u32 charge_delay;
> + u32 thr_cnt;
> + u32 samples;
> + u32 scale;
> + u32 keycode;
> +};
> +
> +struct qt1050_priv {
> + struct i2c_client *client;
> + struct input_dev *input;
> + struct regmap *regmap;
> + struct qt1050_key keys[QT1050_MAX_KEYS];
> + unsigned short keycodes[QT1050_MAX_KEYS];
> + u8 reg_keys;
> + u8 last_keys;
> +};
> +
> +static const struct qt1050_key_regs qt1050_key_regs_data[] = {
> + {
> + .nthr = QT1050_NTHR_0,
> + .pulse_scale = QT1050_PULSE_SCALE_0,
> + .di_aks = QT1050_DI_AKS_0,
> + .csd = QT1050_CSD_0,
> + }, {
> + .nthr = QT1050_NTHR_1,
> + .pulse_scale = QT1050_PULSE_SCALE_1,
> + .di_aks = QT1050_DI_AKS_1,
> + .csd = QT1050_CSD_1,
> + }, {
> + .nthr = QT1050_NTHR_2,
> + .pulse_scale = QT1050_PULSE_SCALE_2,
> + .di_aks = QT1050_DI_AKS_2,
> + .csd = QT1050_CSD_2,
> + }, {
> + .nthr = QT1050_NTHR_3,
> + .pulse_scale = QT1050_PULSE_SCALE_3,
> + .di_aks = QT1050_DI_AKS_3,
> + .csd = QT1050_CSD_3,
> + }, {
> + .nthr = QT1050_NTHR_4,
> + .pulse_scale = QT1050_PULSE_SCALE_4,
> + .di_aks = QT1050_DI_AKS_4,
> + .csd = QT1050_CSD_4,
> + }
> +};
> +
> +static bool qt1050_volatile_reg(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case QT1050_DET_STATUS:
> + case QT1050_KEY_STATUS:
> + case QT1050_KEY_SIGNAL_0_MSB:
> + case QT1050_KEY_SIGNAL_0_LSB:
> + case QT1050_KEY_SIGNAL_1_MSB:
> + case QT1050_KEY_SIGNAL_1_LSB:
> + case QT1050_KEY_SIGNAL_2_MSB:
> + case QT1050_KEY_SIGNAL_2_LSB:
> + case QT1050_KEY_SIGNAL_3_MSB:
> + case QT1050_KEY_SIGNAL_3_LSB:
> + case QT1050_KEY_SIGNAL_4_MSB:
> + case QT1050_KEY_SIGNAL_4_LSB:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static const struct regmap_range qt1050_readable_ranges[] = {
> + regmap_reg_range(QT1050_CHIP_ID, QT1050_KEY_STATUS),
> + regmap_reg_range(QT1050_KEY_SIGNAL_0_MSB, QT1050_KEY_SIGNAL_1_LSB),
> + regmap_reg_range(QT1050_KEY_SIGNAL_2_MSB, QT1050_KEY_SIGNAL_4_LSB),
> + regmap_reg_range(QT1050_REF_DATA_0_MSB, QT1050_REF_DATA_1_LSB),
> + regmap_reg_range(QT1050_REF_DATA_2_MSB, QT1050_REF_DATA_4_LSB),
> + regmap_reg_range(QT1050_NTHR_0, QT1050_NTHR_1),
> + regmap_reg_range(QT1050_NTHR_2, QT1050_NTHR_4),
> + regmap_reg_range(QT1050_PULSE_SCALE_0, QT1050_PULSE_SCALE_1),
> + regmap_reg_range(QT1050_PULSE_SCALE_2, QT1050_PULSE_SCALE_4),
> + regmap_reg_range(QT1050_DI_AKS_0, QT1050_DI_AKS_1),
> + regmap_reg_range(QT1050_DI_AKS_2, QT1050_DI_AKS_4),
> + regmap_reg_range(QT1050_CSD_0, QT1050_CSD_1),
> + regmap_reg_range(QT1050_CSD_2, QT1050_RES_CAL),
> +};
> +
> +static const struct regmap_access_table qt1050_readable_table = {
> + .yes_ranges = qt1050_readable_ranges,
> + .n_yes_ranges = ARRAY_SIZE(qt1050_readable_ranges),
> +};
> +
> +static const struct regmap_range qt1050_writeable_ranges[] = {
> + regmap_reg_range(QT1050_NTHR_0, QT1050_NTHR_1),
> + regmap_reg_range(QT1050_NTHR_2, QT1050_NTHR_4),
> + regmap_reg_range(QT1050_PULSE_SCALE_0, QT1050_PULSE_SCALE_1),
> + regmap_reg_range(QT1050_PULSE_SCALE_2, QT1050_PULSE_SCALE_4),
> + regmap_reg_range(QT1050_DI_AKS_0, QT1050_DI_AKS_1),
> + regmap_reg_range(QT1050_DI_AKS_2, QT1050_DI_AKS_4),
> + regmap_reg_range(QT1050_CSD_0, QT1050_CSD_1),
> + regmap_reg_range(QT1050_CSD_2, QT1050_RES_CAL),
> +};
> +
> +static const struct regmap_access_table qt1050_writeable_table = {
> + .yes_ranges = qt1050_writeable_ranges,
> + .n_yes_ranges = ARRAY_SIZE(qt1050_writeable_ranges),
> +};
> +
> +static struct regmap_config qt1050_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = QT1050_RES_CAL,
> +
> + .cache_type = REGCACHE_RBTREE,
> +
> + .wr_table = &qt1050_writeable_table,
> + .rd_table = &qt1050_readable_table,
> + .volatile_reg = qt1050_volatile_reg,
> +};
> +
> +static bool qt1050_identify(struct qt1050_priv *ts)
> +{
> + unsigned int val;
> +
> + /* Read Chip ID */
> + regmap_read(ts->regmap, QT1050_CHIP_ID, &val);
> + if (val != QT1050_CHIP_ID_VER) {
> + dev_err(&ts->client->dev, "ID %d not supported\n", val);
> + return false;
> + }
> +
> + /* Read firmware version */
> + regmap_read(ts->regmap, QT1050_FW_VERSION, &val);
> + if (val < 0) {
> + dev_err(&ts->client->dev, "could not read the firmware version\n");
> + return false;
> + }
> +
> + dev_info(&ts->client->dev, "AT42QT1050 firmware version %1d.%1d\n",
> + val >> 4, val & 0xf);
> +
> + return true;
> +}
> +
> +static irqreturn_t qt1050_irq_threaded(int irq, void *dev_id)
> +{
> + struct qt1050_priv *ts = dev_id;
> + struct input_dev *input = ts->input;
> + unsigned long new_keys, changed;
> + unsigned int val;
> + int i, err;
> +
> + /* Read the detected status register, thus clearing interrupt */
> + err = regmap_read(ts->regmap, QT1050_DET_STATUS, &val);
> + if (err) {
> + dev_err(&ts->client->dev, "Fail to read detection status: %d\n",
> + err);
> + return IRQ_NONE;
> + }
> +
> + /* Read which key changed, keys are not continuous */
> + err = regmap_read(ts->regmap, QT1050_KEY_STATUS, &val);
> + if (err) {
> + dev_err(&ts->client->dev,
> + "Fail to determine the key status: %d\n", err);
> + return IRQ_NONE;
> + }
> + new_keys = (val & 0x70) >> 2 | (val & 0x6) >> 1;
> + changed = ts->last_keys ^ new_keys;
> + /* Report registered keys only */
> + changed &= ts->reg_keys;
> +
> + for_each_set_bit(i, &changed, QT1050_MAX_KEYS)
> + input_report_key(input, ts->keys[i].keycode,
> + test_bit(i, &new_keys));
> +
> + ts->last_keys = new_keys;
> + input_sync(input);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static const struct qt1050_key_regs *qt1050_get_key_regs(int key_num)
> +{
> + return &qt1050_key_regs_data[key_num];
> +}
> +
> +static int qt1050_set_key(struct regmap *map, int number, int on)
> +{
> + const struct qt1050_key_regs *key_regs;
> +
> + key_regs = qt1050_get_key_regs(number);
> +
> + return regmap_update_bits(map, key_regs->di_aks, 0xfc,
> + on ? BIT(4) : 0x00);
> +}
> +
> +static int qt1050_apply_fw_data(struct qt1050_priv *ts)
> +{
> + struct regmap *map = ts->regmap;
> + struct qt1050_key *button = &ts->keys[0];
> + const struct qt1050_key_regs *key_regs;
> + int i, err;
> +
> + /* Disable all keys and enable only the specified ones */
> + for (i = 0; i < QT1050_MAX_KEYS; i++) {
> + err = qt1050_set_key(map, i, 0);
> + if (err)
> + return err;
> + }
> +
> + for (i = 0; i < QT1050_MAX_KEYS; i++, button++) {
> + /* Keep KEY_RESERVED keys off */
> + if (button->keycode == KEY_RESERVED)
> + continue;
> +
> + err = qt1050_set_key(map, button->num, 1);
> + if (err)
> + return err;
> +
> + key_regs = qt1050_get_key_regs(button->num);
> +
> + err = regmap_write(map, key_regs->pulse_scale,
> + (button->samples << 4) | (button->scale));
> + if (err)
> + return err;
> + err = regmap_write(map, key_regs->csd, button->charge_delay);
> + if (err)
> + return err;
> + err = regmap_write(map, key_regs->nthr, button->thr_cnt);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int qt1050_parse_fw(struct qt1050_priv *ts)
> +{
> + struct device *dev = &ts->client->dev;
> + struct fwnode_handle *child;
> + int nbuttons;
> +
> + nbuttons = device_get_child_node_count(dev);
> + if (nbuttons == 0 || nbuttons > QT1050_MAX_KEYS)
> + return -ENODEV;
> +
> + device_for_each_child_node(dev, child) {
> + struct qt1050_key button;
> +
> + /* Required properties */
> + if (fwnode_property_read_u32(child, "linux,code",
> + &button.keycode)) {
> + dev_err(dev, "Button without keycode\n");
> + goto err;
> + }
> + if (button.keycode >= KEY_MAX) {
> + dev_err(dev, "Invalid keycode 0x%x\n",
> + button.keycode);
> + goto err;
> + }
> +
> + if (fwnode_property_read_u32(child, "reg",
> + &button.num)) {
> + dev_err(dev, "Button without pad number\n");
> + goto err;
> + }
> + if (button.num < 0 || button.num > QT1050_MAX_KEYS - 1)
> + goto err;
> +
> + ts->reg_keys |= BIT(button.num);
> +
> + /* Optional properties */
> + if (fwnode_property_read_u32(child,
> + "microchip,pre-charge-time-ns",
> + &button.charge_delay)) {
> + button.charge_delay = 0;
> + } else {
> + if (button.charge_delay % 2500 == 0)
> + button.charge_delay =
> + button.charge_delay / 2500;
> + else
> + button.charge_delay = 0;
> + }
> +
> + if (fwnode_property_read_u32(child, "microchip,average-samples",
> + &button.samples)) {
> + button.samples = 0;
> + } else {
> + if (is_power_of_2(button.samples))
> + button.samples = ilog2(button.samples);
> + else
> + button.samples = 0;
> + }
> +
> + if (fwnode_property_read_u32(child, "microchip,average-scaling",
> + &button.scale)) {
> + button.scale = 0;
> + } else {
> + if (is_power_of_2(button.scale))
> + button.scale = ilog2(button.scale);
> + else
> + button.scale = 0;
> +
> + }
> +
> + if (fwnode_property_read_u32(child, "microchip,threshold",
> + &button.thr_cnt)) {
> + button.thr_cnt = 20;
> + } else {
> + if (button.thr_cnt > 255)
> + button.thr_cnt = 20;
> + }
> +
> + ts->keys[button.num] = button;
> + }
> +
> + return 0;
> +
> +err:
> + fwnode_handle_put(child);
> + return -EINVAL;
> +}
> +
> +static int qt1050_probe(struct i2c_client *client)
> +{
> + struct qt1050_priv *ts;
> + struct input_dev *input;
> + struct device *dev = &client->dev;
> + struct regmap *map;
> + unsigned int status, i;
> + int err;
> +
> + /* Check basic functionality */
> + err = i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE);
> + if (!err) {
> + dev_err(&client->dev, "%s adapter not supported\n",
> + dev_driver_string(&client->adapter->dev));
> + return -ENODEV;
> + }
> +
> + if (!client->irq) {
> + dev_err(dev, "assign a irq line to this device\n");
> + return -EINVAL;
> + }
> +
> + ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
> + if (!ts)
> + return -ENOMEM;
> +
> + input = devm_input_allocate_device(dev);
> + if (!input)
> + return -ENOMEM;
> +
> + map = devm_regmap_init_i2c(client, &qt1050_regmap_config);
> + if (IS_ERR(map))
> + return PTR_ERR(map);
> +
> + ts->client = client;
> + ts->input = input;
> + ts->regmap = map;
> +
> + i2c_set_clientdata(client, ts);
> +
> + /* Identify the qt1050 chip */
> + if (!qt1050_identify(ts))
> + return -ENODEV;
> +
> + /* Get pdata */
> + err = qt1050_parse_fw(ts);
> + if (err) {
> + dev_err(dev, "Failed to parse firmware: %d\n", err);
> + return err;
> + }
> +
> + input->name = "AT42QT1050 QTouch Sensor";
> + input->dev.parent = &client->dev;
> + input->id.bustype = BUS_I2C;
> +
> + /* Add the keycode */
> + input->keycode = ts->keycodes;
> + input->keycodesize = sizeof(ts->keycodes[0]);
> + input->keycodemax = QT1050_MAX_KEYS;
> +
> + __set_bit(EV_KEY, input->evbit);
> + for (i = 0; i < QT1050_MAX_KEYS; i++) {
> + ts->keycodes[i] = ts->keys[i].keycode;
> + __set_bit(ts->keycodes[i], input->keybit);
> + }
> +
> + /* Trigger re-calibration */
> + err = regmap_update_bits(ts->regmap, QT1050_RES_CAL, 0x7f,
> + QT1050_RES_CAL_CALIBRATE);
> + if (err) {
> + dev_err(dev, "Trigger calibration failed: %d\n", err);
> + return err;
> + }
> + err = regmap_read_poll_timeout(ts->regmap, QT1050_DET_STATUS, status,
> + status >> 7 == 1, 10000, 200000);
> + if (err) {
> + dev_err(dev, "Calibration failed: %d\n", err);
> + return err;
> + }
> +
> + /* Soft reset to set defaults */
> + err = regmap_update_bits(ts->regmap, QT1050_RES_CAL,
> + QT1050_RES_CAL_RESET, QT1050_RES_CAL_RESET);
> + if (err) {
> + dev_err(dev, "Trigger soft reset failed: %d\n", err);
> + return err;
> + }
> + msleep(QT1050_RESET_TIME);
> +
> + /* Set pdata */
> + err = qt1050_apply_fw_data(ts);
> + if (err) {
> + dev_err(dev, "Failed to set firmware data: %d\n", err);
> + return err;
> + }
> +
> + err = devm_request_threaded_irq(dev, client->irq, NULL,
> + qt1050_irq_threaded, IRQF_ONESHOT,
> + "qt1050", ts);
> + if (err) {
> + dev_err(&client->dev, "Failed to request irq: %d\n", err);
> + return err;
> + }
> +
> + /* Clear #CHANGE line */
> + err = regmap_read(ts->regmap, QT1050_DET_STATUS, &status);
> + if (err) {
> + dev_err(dev, "Failed to clear #CHANGE line level: %d\n", err);
> + return err;
> + }
> +
> + /* Register the input device */
> + err = input_register_device(ts->input);
> + if (err) {
> + dev_err(&client->dev, "Failed to register input device: %d\n",
> + err);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int __maybe_unused qt1050_suspend(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct qt1050_priv *ts = i2c_get_clientdata(client);
> +
> + disable_irq(client->irq);
> +
> + /*
> + * Set measurement interval to 1s (125 x 8ms) if wakeup is allowed
> + * else turn off. The 1s interval seems to be a good compromise between
> + * low power and response time.
> + */
> + return regmap_write(ts->regmap, QT1050_LPMODE,
> + device_may_wakeup(dev) ? 125 : 0);
> +}
> +
> +static int __maybe_unused qt1050_resume(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct qt1050_priv *ts = i2c_get_clientdata(client);
> +
> + enable_irq(client->irq);
> +
> + /* Set measurement interval back to 16ms (2 x 8ms) */
> + return regmap_write(ts->regmap, QT1050_LPMODE, 2);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(qt1050_pm_ops, qt1050_suspend, qt1050_resume);
> +
> +static const struct of_device_id __maybe_unused qt1050_of_match[] = {
> + { .compatible = "microchip,qt1050", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, qt1050_of_match);
> +
> +static struct i2c_driver qt1050_driver = {
> + .driver = {
> + .name = "qt1050",
> + .of_match_table = of_match_ptr(qt1050_of_match),
> + .pm = &qt1050_pm_ops,
> + },
> + .probe_new = qt1050_probe,
> +};
> +
> +module_i2c_driver(qt1050_driver);
> +
> +MODULE_AUTHOR("Marco Felsch <kernel@xxxxxxxxxxxxxx");
> +MODULE_DESCRIPTION("Driver for AT42QT1050 QTouch sensor");
> +MODULE_LICENSE("GPL v2");
> --
> 2.20.1
>
--
Dmitry
