Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 498 insertions, 0 deletions

diff --git a/drivers/input/keyboard/cap11xx.c b/drivers/input/keyboard/cap11xx.c
new file mode 100644
index 000000000..688e2bef6
--- /dev/null
+++ b/drivers/input/keyboard/cap11xx.c
@@ -0,0 +1,498 @@
+// 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/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/leds.h>
+#include <linux/of_irq.h>
+#include <linux/regmap.h>
+#include <linux/i2c.h>
+#include <linux/gpio/consumer.h>
+
+#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_GENERAL_STATUS	0x02
+#define CAP11XX_REG_SENSOR_INPUT	0x03
+#define CAP11XX_REG_NOISE_FLAG_STATUS	0x0a
+#define CAP11XX_REG_SENOR_DELTA(X)	(0x10 + (X))
+#define CAP11XX_REG_SENSITIVITY_CONTROL	0x1f
+#define CAP11XX_REG_CONFIG		0x20
+#define CAP11XX_REG_SENSOR_ENABLE	0x21
+#define CAP11XX_REG_SENSOR_CONFIG	0x22
+#define CAP11XX_REG_SENSOR_CONFIG2	0x23
+#define CAP11XX_REG_SAMPLING_CONFIG	0x24
+#define CAP11XX_REG_CALIBRATION		0x26
+#define CAP11XX_REG_INT_ENABLE		0x27
+#define CAP11XX_REG_REPEAT_RATE		0x28
+#define CAP11XX_REG_MT_CONFIG		0x2a
+#define CAP11XX_REG_MT_PATTERN_CONFIG	0x2b
+#define CAP11XX_REG_MT_PATTERN		0x2d
+#define CAP11XX_REG_RECALIB_CONFIG	0x2f
+#define CAP11XX_REG_SENSOR_THRESH(X)	(0x30 + (X))
+#define CAP11XX_REG_SENSOR_NOISE_THRESH	0x38
+#define CAP11XX_REG_STANDBY_CHANNEL	0x40
+#define CAP11XX_REG_STANDBY_CONFIG	0x41
+#define CAP11XX_REG_STANDBY_SENSITIVITY	0x42
+#define CAP11XX_REG_STANDBY_THRESH	0x43
+#define CAP11XX_REG_CONFIG2		0x44
+#define CAP11XX_REG_CONFIG2_ALT_POL	BIT(6)
+#define CAP11XX_REG_SENSOR_BASE_CNT(X)	(0x50 + (X))
+#define CAP11XX_REG_LED_POLARITY	0x73
+#define CAP11XX_REG_LED_OUTPUT_CONTROL	0x74
+
+#define CAP11XX_REG_LED_DUTY_CYCLE_1	0x90
+#define CAP11XX_REG_LED_DUTY_CYCLE_2	0x91
+#define CAP11XX_REG_LED_DUTY_CYCLE_3	0x92
+#define CAP11XX_REG_LED_DUTY_CYCLE_4	0x93
+
+#define CAP11XX_REG_LED_DUTY_MIN_MASK	(0x0f)
+#define CAP11XX_REG_LED_DUTY_MIN_MASK_SHIFT	(0)
+#define CAP11XX_REG_LED_DUTY_MAX_MASK	(0xf0)
+#define CAP11XX_REG_LED_DUTY_MAX_MASK_SHIFT	(4)
+#define CAP11XX_REG_LED_DUTY_MAX_VALUE	(15)
+
+#define CAP11XX_REG_SENSOR_CALIB	(0xb1 + (X))
+#define CAP11XX_REG_SENSOR_CALIB_LSB1	0xb9
+#define CAP11XX_REG_SENSOR_CALIB_LSB2	0xba
+#define CAP11XX_REG_PRODUCT_ID		0xfd
+#define CAP11XX_REG_MANUFACTURER_ID	0xfe
+#define CAP11XX_REG_REVISION		0xff
+
+#define CAP11XX_MANUFACTURER_ID	0x5d
+
+#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 input_dev *idev;
+
+	struct cap11xx_led *leds;
+	int num_leds;
+
+	/* config */
+	u32 keycodes[];
+};
+
+struct cap11xx_hw_model {
+	u8 product_id;
+	unsigned int num_channels;
+	unsigned int num_leds;
+};
+
+enum {
+	CAP1106,
+	CAP1126,
+	CAP1188,
+};
+
+static const struct cap11xx_hw_model cap11xx_devices[] = {
+	[CAP1106] = { .product_id = 0x55, .num_channels = 6, .num_leds = 0 },
+	[CAP1126] = { .product_id = 0x53, .num_channels = 6, .num_leds = 2 },
+	[CAP1188] = { .product_id = 0x50, .num_channels = 8, .num_leds = 8 },
+};
+
+static const struct reg_default cap11xx_reg_defaults[] = {
+	{ CAP11XX_REG_MAIN_CONTROL,		0x00 },
+	{ CAP11XX_REG_GENERAL_STATUS,		0x00 },
+	{ CAP11XX_REG_SENSOR_INPUT,		0x00 },
+	{ CAP11XX_REG_NOISE_FLAG_STATUS,	0x00 },
+	{ CAP11XX_REG_SENSITIVITY_CONTROL,	0x2f },
+	{ CAP11XX_REG_CONFIG,			0x20 },
+	{ CAP11XX_REG_SENSOR_ENABLE,		0x3f },
+	{ CAP11XX_REG_SENSOR_CONFIG,		0xa4 },
+	{ CAP11XX_REG_SENSOR_CONFIG2,		0x07 },
+	{ CAP11XX_REG_SAMPLING_CONFIG,		0x39 },
+	{ CAP11XX_REG_CALIBRATION,		0x00 },
+	{ CAP11XX_REG_INT_ENABLE,		0x3f },
+	{ CAP11XX_REG_REPEAT_RATE,		0x3f },
+	{ CAP11XX_REG_MT_CONFIG,		0x80 },
+	{ CAP11XX_REG_MT_PATTERN_CONFIG,	0x00 },
+	{ CAP11XX_REG_MT_PATTERN,		0x3f },
+	{ CAP11XX_REG_RECALIB_CONFIG,		0x8a },
+	{ 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_NOISE_THRESH,	0x01 },
+	{ CAP11XX_REG_STANDBY_CHANNEL,		0x00 },
+	{ CAP11XX_REG_STANDBY_CONFIG,		0x39 },
+	{ CAP11XX_REG_STANDBY_SENSITIVITY,	0x02 },
+	{ CAP11XX_REG_STANDBY_THRESH,		0x40 },
+	{ CAP11XX_REG_CONFIG2,			0x40 },
+	{ CAP11XX_REG_LED_POLARITY,		0x00 },
+	{ CAP11XX_REG_SENSOR_CALIB_LSB1,	0x00 },
+	{ CAP11XX_REG_SENSOR_CALIB_LSB2,	0x00 },
+};
+
+static bool cap11xx_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case CAP11XX_REG_MAIN_CONTROL:
+	case CAP11XX_REG_SENSOR_INPUT:
+	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):
+	case CAP11XX_REG_PRODUCT_ID:
+	case CAP11XX_REG_MANUFACTURER_ID:
+	case CAP11XX_REG_REVISION:
+		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_RBTREE,
+	.volatile_reg = cap11xx_volatile_reg,
+};
+
+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, CAP11XX_REG_SENSOR_INPUT, &status);
+	if (ret < 0)
+		goto out;
+
+	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).
+	 */
+	return regmap_update_bits(priv->regmap,
+				  CAP11XX_REG_LED_OUTPUT_CONTROL,
+				  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, *child;
+	struct cap11xx_led *led;
+	int cnt = of_get_child_count(node);
+	int error;
+
+	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;
+
+	error = regmap_update_bits(priv->regmap,
+				CAP11XX_REG_LED_OUTPUT_CONTROL, 0xff, 0);
+	if (error)
+		return error;
+
+	error = regmap_update_bits(priv->regmap, CAP11XX_REG_LED_DUTY_CYCLE_4,
+				CAP11XX_REG_LED_DUTY_MAX_MASK,
+				CAP11XX_REG_LED_DUTY_MAX_VALUE <<
+				CAP11XX_REG_LED_DUTY_MAX_MASK_SHIFT);
+	if (error)
+		return error;
+
+	for_each_child_of_node(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) {
+			of_node_put(child);
+			return -EINVAL;
+		}
+
+		led->reg = reg;
+		led->priv = priv;
+
+		error = devm_led_classdev_register(dev, &led->cdev);
+		if (error) {
+			of_node_put(child);
+			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)
+{
+	struct device *dev = &i2c_client->dev;
+	struct cap11xx_priv *priv;
+	struct device_node *node;
+	const struct cap11xx_hw_model *cap;
+	int i, error, irq, gain = 0;
+	unsigned int val, rev;
+	u32 gain32;
+
+	if (id->driver_data >= ARRAY_SIZE(cap11xx_devices)) {
+		dev_err(dev, "Invalid device ID %lu\n", id->driver_data);
+		return -EINVAL;
+	}
+
+	cap = &cap11xx_devices[id->driver_data];
+	if (!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->regmap = devm_regmap_init_i2c(i2c_client, &cap11xx_regmap_config);
+	if (IS_ERR(priv->regmap))
+		return PTR_ERR(priv->regmap);
+
+	error = regmap_read(priv->regmap, CAP11XX_REG_PRODUCT_ID, &val);
+	if (error)
+		return error;
+
+	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 error;
+
+	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 < 0)
+		return error;
+
+	dev_info(dev, "CAP11XX detected, revision 0x%02x\n", rev);
+	node = dev->of_node;
+
+	if (!of_property_read_u32(node, "microchip,sensor-gain", &gain32)) {
+		if (is_power_of_2(gain32) && gain32 <= 8)
+			gain = ilog2(gain32);
+		else
+			dev_err(dev, "Invalid sensor-gain value %d\n", gain32);
+	}
+
+	if (of_property_read_bool(node, "microchip,irq-active-high")) {
+		error = regmap_update_bits(priv->regmap, CAP11XX_REG_CONFIG2,
+					   CAP11XX_REG_CONFIG2_ALT_POL, 0);
+		if (error)
+			return error;
+	}
+
+	/* Provide some useful defaults */
+	for (i = 0; i < cap->num_channels; i++)
+		priv->keycodes[i] = KEY_A + i;
+
+	of_property_read_u32_array(node, "linux,keycodes",
+				   priv->keycodes, cap->num_channels);
+
+	error = regmap_update_bits(priv->regmap, CAP11XX_REG_MAIN_CONTROL,
+				   CAP11XX_REG_MAIN_CONTROL_GAIN_MASK,
+				   gain << CAP11XX_REG_MAIN_CONTROL_GAIN_SHIFT);
+	if (error)
+		return error;
+
+	/* Disable autorepeat. The Linux input system has its own handling. */
+	error = regmap_write(priv->regmap, CAP11XX_REG_REPEAT_RATE, 0);
+	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(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;
+
+	irq = irq_of_parse_and_map(node, 0);
+	if (!irq) {
+		dev_err(dev, "Unable to parse or map IRQ\n");
+		return -ENXIO;
+	}
+
+	error = devm_request_threaded_irq(dev, irq, NULL, cap11xx_thread_func,
+					  IRQF_ONESHOT, dev_name(dev), priv);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static const struct of_device_id cap11xx_dt_ids[] = {
+	{ .compatible = "microchip,cap1106", },
+	{ .compatible = "microchip,cap1126", },
+	{ .compatible = "microchip,cap1188", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, cap11xx_dt_ids);
+
+static const struct i2c_device_id cap11xx_i2c_ids[] = {
+	{ "cap1106", CAP1106 },
+	{ "cap1126", CAP1126 },
+	{ "cap1188", CAP1188 },
+	{}
+};
+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");