drivers/input/keyboard/cap11xx.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Input driver for Microchip CAP11xx based capacitive touch sensors
 *
 * (c) 2014 Daniel Mack <linux@zonque.org>
 */

#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/i2c.h>
#include <linux/gpio/consumer.h>
#include <linux/bitfield.h>

#define CAP1114_REG_BUTTON_STATUS1	0x03
#define CAP1114_REG_BUTTON_STATUS2	0x04
#define CAP1114_REG_CONFIG2			0x40
#define CAP1114_REG_CONFIG2_VOL_UP_DOWN	BIT(1)
#define CAP1114_REG_LED_OUTPUT_CONTROL1	0x73

#define CAP11XX_REG_MAIN_CONTROL	0x00
#define CAP11XX_REG_MAIN_CONTROL_GAIN_SHIFT	(6)
#define CAP11XX_REG_MAIN_CONTROL_GAIN_MASK	(0xc0)
#define CAP11XX_REG_MAIN_CONTROL_DLSEEP		BIT(4)
#define CAP11XX_REG_SENSOR_INPUT	0x03
#define CAP1114_REG_BUTTON_STATUS2	0x04
#define CAP11XX_REG_SENOR_DELTA(X)	(0x10 + (X))
#define CAP11XX_REG_SENSITIVITY_CONTROL	0x1f
#define CAP11XX_REG_SENSITIVITY_CONTROL_DELTA_SENSE_MASK	0x70
#define CAP11XX_REG_REPEAT_RATE		0x28
#define CAP11XX_REG_SIGNAL_GUARD_ENABLE	0x29
#define CAP11XX_REG_SENSOR_THRESH(X)	(0x30 + (X))
#define CAP11XX_REG_CONFIG2		0x44
#define CAP11XX_REG_CONFIG2_ALT_POL	BIT(6)
#define CAP11XX_REG_LED_OUTPUT_CONTROL	0x74
#define CAP11XX_REG_CALIB_SENSITIVITY_CONFIG	0x80
#define CAP11XX_REG_CALIB_SENSITIVITY_CONFIG2	0x81
#define CAP11XX_REG_LED_DUTY_CYCLE_4	0x93

#define CAP11XX_REG_LED_DUTY_MAX_MASK	(0xf0)
#define CAP11XX_REG_LED_DUTY_MAX_VALUE	(15)

#define CAP11XX_REG_PRODUCT_ID		0xfd
#define CAP11XX_REG_MANUFACTURER_ID	0xfe
#define CAP11XX_REG_REVISION		0xff

#define CAP11XX_MANUFACTURER_ID	0x5d

#define CAP11XX_T_RST_FILT_MIN_US	10000
#define CAP11XX_T_RST_ON_MIN_MS		400

#ifdef CONFIG_LEDS_CLASS
struct cap11xx_led {
	struct cap11xx_priv *priv;
	struct led_classdev cdev;
	u32 reg;
};
#endif

struct cap11xx_priv {
	struct regmap *regmap;
	struct device *dev;
	struct input_dev *idev;
	struct gpio_desc *reset_gpio;
	const struct cap11xx_hw_model *model;

	struct cap11xx_led *leds;
	int num_leds;

	/* config */
	u8 analog_gain;
	u8 sensitivity_delta_sense;
	u8 signal_guard_inputs_mask;
	u32 thresholds[8];
	u32 calib_sensitivities[8];
	u32 keycodes[];
};

struct cap11xx_hw_model {
	u8 product_id;
	u8 led_output_control_reg_base;
	u8 sensor_input_reg_base;
	unsigned int num_channels;
	unsigned int num_leds;
	unsigned int num_sensor_thresholds;
	bool has_gain;
	bool has_grouped_sensors;
	bool has_irq_config;
	bool has_repeat_en;
	bool has_sensitivity_control;
	bool has_signal_guard;
};

static const struct reg_default cap11xx_reg_defaults[] = {
	{ CAP11XX_REG_MAIN_CONTROL,		0x00 },
	{ CAP11XX_REG_SENSITIVITY_CONTROL,	0x2f },
	{ CAP11XX_REG_REPEAT_RATE,		0x3f },
	{ CAP11XX_REG_SENSOR_THRESH(0),		0x40 },
	{ CAP11XX_REG_SENSOR_THRESH(1),		0x40 },
	{ CAP11XX_REG_SENSOR_THRESH(2),		0x40 },
	{ CAP11XX_REG_SENSOR_THRESH(3),		0x40 },
	{ CAP11XX_REG_SENSOR_THRESH(4),		0x40 },
	{ CAP11XX_REG_SENSOR_THRESH(5),		0x40 },
	{ CAP11XX_REG_SENSOR_THRESH(6),		0x40 },
	{ CAP11XX_REG_SENSOR_THRESH(7),		0x40 },
	{ CAP11XX_REG_CONFIG2,			0x40 },
};

static bool cap11xx_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case CAP11XX_REG_MAIN_CONTROL:
	case CAP11XX_REG_SENSOR_INPUT:
	/*
	 * CAP1114_REG_BUTTON_STATUS1 (CAP11XX_REG_SENSOR_INPUT) and
	 * CAP1114_REG_BUTTON_STATUS2 is volatile for the CAP1114,
	 * which supports more than 8 touch channels.
	 */
	case CAP1114_REG_BUTTON_STATUS2:
	case CAP11XX_REG_SENOR_DELTA(0):
	case CAP11XX_REG_SENOR_DELTA(1):
	case CAP11XX_REG_SENOR_DELTA(2):
	case CAP11XX_REG_SENOR_DELTA(3):
	case CAP11XX_REG_SENOR_DELTA(4):
	case CAP11XX_REG_SENOR_DELTA(5):
		return true;
	}

	return false;
}

static const struct regmap_config cap11xx_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = CAP11XX_REG_REVISION,
	.reg_defaults = cap11xx_reg_defaults,

	.num_reg_defaults = ARRAY_SIZE(cap11xx_reg_defaults),
	.cache_type = REGCACHE_MAPLE,
	.volatile_reg = cap11xx_volatile_reg,
};

static int cap11xx_write_calib_sens_config_1(struct cap11xx_priv *priv)
{
	return regmap_write(priv->regmap,
			    CAP11XX_REG_CALIB_SENSITIVITY_CONFIG,
			    (priv->calib_sensitivities[3] << 6) |
			    (priv->calib_sensitivities[2] << 4) |
			    (priv->calib_sensitivities[1] << 2) |
			    priv->calib_sensitivities[0]);
}

static int cap11xx_write_calib_sens_config_2(struct cap11xx_priv *priv)
{
	return regmap_write(priv->regmap,
			    CAP11XX_REG_CALIB_SENSITIVITY_CONFIG2,
			    (priv->calib_sensitivities[7] << 6) |
			    (priv->calib_sensitivities[6] << 4) |
			    (priv->calib_sensitivities[5] << 2) |
			    priv->calib_sensitivities[4]);
}

static int cap11xx_init_keys(struct cap11xx_priv *priv)
{
	struct device_node *node = priv->dev->of_node;
	struct device *dev = priv->dev;
	int i, error;
	u32 u32_val;

	if (!node) {
		dev_err(dev, "Corresponding DT entry is not available\n");
		return -ENODEV;
	}

	if (!of_property_read_u32(node, "microchip,sensor-gain", &u32_val)) {
		if (!priv->model->has_gain) {
			dev_warn(dev,
				 "This model doesn't support 'sensor-gain'\n");
		} else if (is_power_of_2(u32_val) && u32_val <= 8) {
			priv->analog_gain = (u8)ilog2(u32_val);

			error = regmap_update_bits(priv->regmap,
				CAP11XX_REG_MAIN_CONTROL,
				CAP11XX_REG_MAIN_CONTROL_GAIN_MASK,
				priv->analog_gain << CAP11XX_REG_MAIN_CONTROL_GAIN_SHIFT);
			if (error)
				return error;
		} else {
			dev_err(dev, "Invalid sensor-gain value %u\n", u32_val);
			return -EINVAL;
		}
	}

	if (of_property_read_bool(node, "microchip,irq-active-high")) {
		if (priv->model->has_irq_config) {
			error = regmap_update_bits(priv->regmap,
						   CAP11XX_REG_CONFIG2,
						   CAP11XX_REG_CONFIG2_ALT_POL,
						   0);
			if (error)
				return error;
		} else {
			dev_warn(dev,
				 "This model doesn't support 'irq-active-high'\n");
		}
	}

	if (!of_property_read_u32(node, "microchip,sensitivity-delta-sense", &u32_val)) {
		if (!is_power_of_2(u32_val) || u32_val > 128) {
			dev_err(dev, "Invalid sensitivity-delta-sense value %u\n", u32_val);
			return -EINVAL;
		}

		priv->sensitivity_delta_sense = (u8)ilog2(u32_val);
		u32_val = ~(FIELD_PREP(CAP11XX_REG_SENSITIVITY_CONTROL_DELTA_SENSE_MASK,
					priv->sensitivity_delta_sense));

		error = regmap_update_bits(priv->regmap,
					   CAP11XX_REG_SENSITIVITY_CONTROL,
					   CAP11XX_REG_SENSITIVITY_CONTROL_DELTA_SENSE_MASK,
					   u32_val);
		if (error)
			return error;
	}

	if (!of_property_read_u32_array(node, "microchip,input-threshold",
					priv->thresholds, priv->model->num_sensor_thresholds)) {
		for (i = 0; i < priv->model->num_sensor_thresholds; i++) {
			if (priv->thresholds[i] > 127) {
				dev_err(dev, "Invalid input-threshold value %u\n",
					priv->thresholds[i]);
				return -EINVAL;
			}

			error = regmap_write(priv->regmap,
					     CAP11XX_REG_SENSOR_THRESH(i),
					     priv->thresholds[i]);
			if (error)
				return error;
		}
	}

	if (of_property_present(node, "microchip,calib-sensitivity")) {
		if (!priv->model->has_sensitivity_control) {
			dev_warn(dev,
				 "This model doesn't support 'calib-sensitivity'\n");
		} else if (!of_property_read_u32_array(node, "microchip,calib-sensitivity",
						       priv->calib_sensitivities,
						       priv->model->num_channels)) {
			for (i = 0; i < priv->model->num_channels; i++) {
				if (!is_power_of_2(priv->calib_sensitivities[i]) ||
				    priv->calib_sensitivities[i] > 4) {
					dev_err(dev, "Invalid calib-sensitivity value %u\n",
						priv->calib_sensitivities[i]);
					return -EINVAL;
				}
				priv->calib_sensitivities[i] = ilog2(priv->calib_sensitivities[i]);
			}

			error = cap11xx_write_calib_sens_config_1(priv);
			if (error)
				return error;

			if (priv->model->num_channels > 4) {
				error = cap11xx_write_calib_sens_config_2(priv);
				if (error)
					return error;
			}
		}
	}

	if (of_property_present(node, "microchip,signal-guard")) {
		if (!priv->model->has_signal_guard) {
			dev_warn(dev,
				 "This model doesn't support 'signal-guard'\n");
		} else {
			for (i = 0; i < priv->model->num_channels; i++) {
				if (!of_property_read_u32_index(node, "microchip,signal-guard",
								i, &u32_val)) {
					if (u32_val > 1)
						return -EINVAL;
					if (u32_val)
						priv->signal_guard_inputs_mask |= 0x01 << i;
				}
			}

			if (priv->signal_guard_inputs_mask) {
				error = regmap_write(priv->regmap,
						     CAP11XX_REG_SIGNAL_GUARD_ENABLE,
						     priv->signal_guard_inputs_mask);
				if (error)
					return error;
			}
		}
	}

	/* Provide some useful defaults */
	for (i = 0; i < priv->model->num_channels; i++)
		priv->keycodes[i] = KEY_A + i;

	of_property_read_u32_array(node, "linux,keycodes",
				   priv->keycodes, priv->model->num_channels);

	/*
	 * CAP1114 needs dedicated configuration to split
	 * grouped sensors into independent inputs.
	 */
	if (priv->model->has_grouped_sensors) {
		error = regmap_set_bits(priv->regmap, CAP1114_REG_CONFIG2,
					CAP1114_REG_CONFIG2_VOL_UP_DOWN);
		if (error)
			return error;
	}

	if (priv->model->has_repeat_en) {
		/* Disable autorepeat. The Linux input system has its own handling. */
		error = regmap_write(priv->regmap, CAP11XX_REG_REPEAT_RATE, 0);
		if (error)
			return error;
	}

	return 0;
}

static irqreturn_t cap11xx_thread_func(int irq_num, void *data)
{
	struct cap11xx_priv *priv = data;
	unsigned int status;
	int ret, i;

	/*
	 * Deassert interrupt. This needs to be done before reading the status
	 * registers, which will not carry valid values otherwise.
	 */
	ret = regmap_update_bits(priv->regmap, CAP11XX_REG_MAIN_CONTROL, 1, 0);
	if (ret < 0)
		goto out;

	ret = regmap_read(priv->regmap, priv->model->sensor_input_reg_base, &status);
	if (ret < 0)
		goto out;

	if (priv->model->num_channels > 8) {
		unsigned int status2;

		ret = regmap_read(priv->regmap, priv->model->sensor_input_reg_base + 1, &status2);
		if (ret < 0)
			goto out;

		/*
		 * CAP1114 STATUS1 register only contains data for the first 6 channels.
		 * the remaining channels is stored in STATUS2.
		 */
		status &= GENMASK(5, 0);
		status |= FIELD_PREP(GENMASK(13, 6), status2);
	}

	for (i = 0; i < priv->idev->keycodemax; i++)
		input_report_key(priv->idev, priv->keycodes[i],
				 status & (1 << i));

	input_sync(priv->idev);

out:
	return IRQ_HANDLED;
}

static int cap11xx_set_sleep(struct cap11xx_priv *priv, bool sleep)
{
	/*
	 * DLSEEP mode will turn off all LEDS, prevent this
	 */
	if (IS_ENABLED(CONFIG_LEDS_CLASS) && priv->num_leds)
		return 0;

	return regmap_update_bits(priv->regmap, CAP11XX_REG_MAIN_CONTROL,
				  CAP11XX_REG_MAIN_CONTROL_DLSEEP,
				  sleep ? CAP11XX_REG_MAIN_CONTROL_DLSEEP : 0);
}

static int cap11xx_input_open(struct input_dev *idev)
{
	struct cap11xx_priv *priv = input_get_drvdata(idev);

	return cap11xx_set_sleep(priv, false);
}

static void cap11xx_input_close(struct input_dev *idev)
{
	struct cap11xx_priv *priv = input_get_drvdata(idev);

	cap11xx_set_sleep(priv, true);
}

#ifdef CONFIG_LEDS_CLASS
static int cap11xx_led_set(struct led_classdev *cdev,
			    enum led_brightness value)
{
	struct cap11xx_led *led = container_of(cdev, struct cap11xx_led, cdev);
	struct cap11xx_priv *priv = led->priv;

	/*
	 * All LEDs share the same duty cycle as this is a HW
	 * limitation. Brightness levels per LED are either
	 * 0 (OFF) and 1 (ON).
	 */
	if (led->reg >= 8)
		return regmap_update_bits(priv->regmap,
					  priv->model->led_output_control_reg_base + 1,
					  BIT(led->reg - 8),
					  value ? BIT(led->reg - 8) : 0);
	else
		return regmap_update_bits(priv->regmap,
					  priv->model->led_output_control_reg_base,
					  BIT(led->reg),
					  value ? BIT(led->reg) : 0);
}

static int cap11xx_init_leds(struct device *dev,
			     struct cap11xx_priv *priv, int num_leds)
{
	struct device_node *node = dev->of_node;
	struct cap11xx_led *led;
	int cnt = of_get_child_count(node);
	int error;
	u32 duty_val;

	if (!num_leds || !cnt)
		return 0;

	if (cnt > num_leds)
		return -EINVAL;

	led = devm_kcalloc(dev, cnt, sizeof(struct cap11xx_led), GFP_KERNEL);
	if (!led)
		return -ENOMEM;

	priv->leds = led;

	/* Set all LEDs to off */
	error = regmap_update_bits(priv->regmap,
				   priv->model->led_output_control_reg_base,
				   GENMASK(min(num_leds, 8) - 1, 0), 0);
	if (error)
		return error;

	if (num_leds > 8) {
		error = regmap_update_bits(priv->regmap,
					   priv->model->led_output_control_reg_base + 1,
					   GENMASK(num_leds - 8 - 1, 0), 0);
		if (error)
			return error;
	}

	duty_val = FIELD_PREP(CAP11XX_REG_LED_DUTY_MAX_MASK,
			      CAP11XX_REG_LED_DUTY_MAX_VALUE);

	error = regmap_update_bits(priv->regmap, CAP11XX_REG_LED_DUTY_CYCLE_4,
				   CAP11XX_REG_LED_DUTY_MAX_MASK, duty_val);
	if (error)
		return error;

	for_each_child_of_node_scoped(node, child) {
		u32 reg;

		led->cdev.name =
			of_get_property(child, "label", NULL) ? : child->name;
		led->cdev.default_trigger =
			of_get_property(child, "linux,default-trigger", NULL);
		led->cdev.flags = 0;
		led->cdev.brightness_set_blocking = cap11xx_led_set;
		led->cdev.max_brightness = 1;
		led->cdev.brightness = LED_OFF;

		error = of_property_read_u32(child, "reg", &reg);
		if (error != 0 || reg >= num_leds)
			return -EINVAL;

		led->reg = reg;
		led->priv = priv;

		error = devm_led_classdev_register(dev, &led->cdev);
		if (error)
			return error;

		priv->num_leds++;
		led++;
	}

	return 0;
}
#else
static int cap11xx_init_leds(struct device *dev,
			     struct cap11xx_priv *priv, int num_leds)
{
	return 0;
}
#endif

static int cap11xx_i2c_probe(struct i2c_client *i2c_client)
{
	const struct i2c_device_id *id;
	const struct cap11xx_hw_model *cap;
	struct device *dev = &i2c_client->dev;
	struct cap11xx_priv *priv;
	int i, error;
	unsigned int val, rev;

	id = i2c_client_get_device_id(i2c_client);
	cap = i2c_get_match_data(i2c_client);
	if (!id || !cap || !cap->num_channels) {
		dev_err(dev, "Invalid device configuration\n");
		return -EINVAL;
	}

	priv = devm_kzalloc(dev,
			    struct_size(priv, keycodes, cap->num_channels),
			    GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->dev = dev;

	priv->regmap = devm_regmap_init_i2c(i2c_client, &cap11xx_regmap_config);
	if (IS_ERR(priv->regmap))
		return PTR_ERR(priv->regmap);

	priv->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(priv->reset_gpio))
		return dev_err_probe(dev, PTR_ERR(priv->reset_gpio),
				     "Failed to get 'reset' GPIO\n");

	if (priv->reset_gpio) {
		usleep_range(CAP11XX_T_RST_FILT_MIN_US, CAP11XX_T_RST_FILT_MIN_US * 2);
		gpiod_set_value_cansleep(priv->reset_gpio, 0);
		msleep(CAP11XX_T_RST_ON_MIN_MS);
	}

	error = regmap_read(priv->regmap, CAP11XX_REG_PRODUCT_ID, &val);
	if (error)
		return dev_err_probe(dev, error, "Failed to read product ID\n");

	if (val != cap->product_id) {
		dev_err(dev, "Product ID: Got 0x%02x, expected 0x%02x\n",
			val, cap->product_id);
		return -ENXIO;
	}

	error = regmap_read(priv->regmap, CAP11XX_REG_MANUFACTURER_ID, &val);
	if (error)
		return dev_err_probe(dev, error, "Failed to read manufacturer ID\n");

	if (val != CAP11XX_MANUFACTURER_ID) {
		dev_err(dev, "Manufacturer ID: Got 0x%02x, expected 0x%02x\n",
			val, CAP11XX_MANUFACTURER_ID);
		return -ENXIO;
	}

	error = regmap_read(priv->regmap, CAP11XX_REG_REVISION, &rev);
	if (error)
		return dev_err_probe(dev, error, "Failed to read revision\n");

	priv->model = cap;

	dev_info(dev, "CAP11XX device detected, model %s, revision 0x%02x\n",
		 id->name, rev);

	error = cap11xx_init_keys(priv);
	if (error)
		return error;

	priv->idev = devm_input_allocate_device(dev);
	if (!priv->idev)
		return -ENOMEM;

	priv->idev->name = "CAP11XX capacitive touch sensor";
	priv->idev->id.bustype = BUS_I2C;
	priv->idev->evbit[0] = BIT_MASK(EV_KEY);

	if (of_property_read_bool(dev->of_node, "autorepeat"))
		__set_bit(EV_REP, priv->idev->evbit);

	for (i = 0; i < cap->num_channels; i++)
		__set_bit(priv->keycodes[i], priv->idev->keybit);

	__clear_bit(KEY_RESERVED, priv->idev->keybit);

	priv->idev->keycode = priv->keycodes;
	priv->idev->keycodesize = sizeof(priv->keycodes[0]);
	priv->idev->keycodemax = cap->num_channels;

	priv->idev->id.vendor = CAP11XX_MANUFACTURER_ID;
	priv->idev->id.product = cap->product_id;
	priv->idev->id.version = rev;

	priv->idev->open = cap11xx_input_open;
	priv->idev->close = cap11xx_input_close;

	error = cap11xx_init_leds(dev, priv, cap->num_leds);
	if (error)
		return error;

	input_set_drvdata(priv->idev, priv);

	/*
	 * Put the device in deep sleep mode for now.
	 * ->open() will bring it back once the it is actually needed.
	 */
	cap11xx_set_sleep(priv, true);

	error = input_register_device(priv->idev);
	if (error)
		return error;

	error = devm_request_threaded_irq(dev, i2c_client->irq,
					  NULL, cap11xx_thread_func,
					  IRQF_ONESHOT, dev_name(dev), priv);
	if (error)
		return error;

	return 0;
}

static const struct cap11xx_hw_model cap1106_model = {
	.product_id = 0x55,
	.num_channels = 6, .num_leds = 0, .num_sensor_thresholds = 6,
	.sensor_input_reg_base = CAP11XX_REG_SENSOR_INPUT,
	.has_gain = true,
	.has_irq_config = true,
	.has_repeat_en = true,
};

static const struct cap11xx_hw_model cap1114_model = {
	.product_id = 0x3a,
	.num_channels = 14, .num_leds = 11, .num_sensor_thresholds = 8,
	.led_output_control_reg_base = CAP1114_REG_LED_OUTPUT_CONTROL1,
	.sensor_input_reg_base = CAP1114_REG_BUTTON_STATUS1,
	.has_grouped_sensors = true,
};

static const struct cap11xx_hw_model cap1126_model = {
	.product_id = 0x53,
	.num_channels = 6, .num_leds = 2, .num_sensor_thresholds = 6,
	.led_output_control_reg_base = CAP11XX_REG_LED_OUTPUT_CONTROL,
	.sensor_input_reg_base = CAP11XX_REG_SENSOR_INPUT,
	.has_gain = true,
	.has_irq_config = true,
	.has_repeat_en = true,
};

static const struct cap11xx_hw_model cap1188_model = {
	.product_id = 0x50,
	.num_channels = 8, .num_leds = 8, .num_sensor_thresholds = 8,
	.led_output_control_reg_base = CAP11XX_REG_LED_OUTPUT_CONTROL,
	.sensor_input_reg_base = CAP11XX_REG_SENSOR_INPUT,
	.has_gain = true,
	.has_irq_config = true,
	.has_repeat_en = true,
};

static const struct cap11xx_hw_model cap1203_model = {
	.product_id = 0x6d,
	.num_channels = 3, .num_leds = 0, .num_sensor_thresholds = 3,
	.sensor_input_reg_base = CAP11XX_REG_SENSOR_INPUT,
	.has_repeat_en = true,
};

static const struct cap11xx_hw_model cap1206_model = {
	.product_id = 0x67,
	.num_channels = 6, .num_leds = 0, .num_sensor_thresholds = 6,
	.sensor_input_reg_base = CAP11XX_REG_SENSOR_INPUT,
	.has_repeat_en = true,
};

static const struct cap11xx_hw_model cap1293_model = {
	.product_id = 0x6f,
	.num_channels = 3, .num_leds = 0, .num_sensor_thresholds = 3,
	.sensor_input_reg_base = CAP11XX_REG_SENSOR_INPUT,
	.has_gain = true,
	.has_repeat_en = true,
	.has_sensitivity_control = true,
	.has_signal_guard = true,
};

static const struct cap11xx_hw_model cap1298_model = {
	.product_id = 0x71,
	.num_channels = 8, .num_leds = 0, .num_sensor_thresholds = 8,
	.sensor_input_reg_base = CAP11XX_REG_SENSOR_INPUT,
	.has_gain = true,
	.has_repeat_en = true,
	.has_sensitivity_control = true,
	.has_signal_guard = true,
};

static const struct of_device_id cap11xx_dt_ids[] = {
	{ .compatible = "microchip,cap1106", .data = &cap1106_model },
	{ .compatible = "microchip,cap1114", .data = &cap1114_model },
	{ .compatible = "microchip,cap1126", .data = &cap1126_model },
	{ .compatible = "microchip,cap1188", .data = &cap1188_model },
	{ .compatible = "microchip,cap1203", .data = &cap1203_model },
	{ .compatible = "microchip,cap1206", .data = &cap1206_model },
	{ .compatible = "microchip,cap1293", .data = &cap1293_model },
	{ .compatible = "microchip,cap1298", .data = &cap1298_model },
	{ }
};
MODULE_DEVICE_TABLE(of, cap11xx_dt_ids);

static const struct i2c_device_id cap11xx_i2c_ids[] = {
	{ .name = "cap1106", .driver_data = (kernel_ulong_t)&cap1106_model },
	{ .name = "cap1114", .driver_data = (kernel_ulong_t)&cap1114_model },
	{ .name = "cap1126", .driver_data = (kernel_ulong_t)&cap1126_model },
	{ .name = "cap1188", .driver_data = (kernel_ulong_t)&cap1188_model },
	{ .name = "cap1203", .driver_data = (kernel_ulong_t)&cap1203_model },
	{ .name = "cap1206", .driver_data = (kernel_ulong_t)&cap1206_model },
	{ .name = "cap1293", .driver_data = (kernel_ulong_t)&cap1293_model },
	{ .name = "cap1298", .driver_data = (kernel_ulong_t)&cap1298_model },
	{ }
};
MODULE_DEVICE_TABLE(i2c, cap11xx_i2c_ids);

static struct i2c_driver cap11xx_i2c_driver = {
	.driver = {
		.name	= "cap11xx",
		.of_match_table = cap11xx_dt_ids,
	},
	.id_table	= cap11xx_i2c_ids,
	.probe		= cap11xx_i2c_probe,
};

module_i2c_driver(cap11xx_i2c_driver);

MODULE_DESCRIPTION("Microchip CAP11XX driver");
MODULE_AUTHOR("Daniel Mack <linux@zonque.org>");
MODULE_LICENSE("GPL v2");