Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 616 insertions, 0 deletions

diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
new file mode 100644
index 000000000..f51b356d4
--- /dev/null
+++ b/drivers/leds/leds-pca955x.c
@@ -0,0 +1,616 @@
+/*
+ * Copyright 2007-2008 Extreme Engineering Solutions, Inc.
+ *
+ * Author: Nate Case <ncase@xes-inc.com>
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License.  See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * LED driver for various PCA955x I2C LED drivers
+ *
+ * Supported devices:
+ *
+ *	Device		Description		7-bit slave address
+ *	------		-----------		-------------------
+ *	PCA9550		2-bit driver		0x60 .. 0x61
+ *	PCA9551		8-bit driver		0x60 .. 0x67
+ *	PCA9552		16-bit driver		0x60 .. 0x67
+ *	PCA9553/01	4-bit driver		0x62
+ *	PCA9553/02	4-bit driver		0x63
+ *
+ * Philips PCA955x LED driver chips follow a register map as shown below:
+ *
+ *	Control Register		Description
+ *	----------------		-----------
+ *	0x0				Input register 0
+ *					..
+ *	NUM_INPUT_REGS - 1		Last Input register X
+ *
+ *	NUM_INPUT_REGS			Frequency prescaler 0
+ *	NUM_INPUT_REGS + 1		PWM register 0
+ *	NUM_INPUT_REGS + 2		Frequency prescaler 1
+ *	NUM_INPUT_REGS + 3		PWM register 1
+ *
+ *	NUM_INPUT_REGS + 4		LED selector 0
+ *	NUM_INPUT_REGS + 4
+ *	    + NUM_LED_REGS - 1		Last LED selector
+ *
+ *  where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many
+ *  bits the chip supports.
+ */
+
+#include <linux/acpi.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <dt-bindings/leds/leds-pca955x.h>
+
+/* LED select registers determine the source that drives LED outputs */
+#define PCA955X_LS_LED_ON	0x0	/* Output LOW */
+#define PCA955X_LS_LED_OFF	0x1	/* Output HI-Z */
+#define PCA955X_LS_BLINK0	0x2	/* Blink at PWM0 rate */
+#define PCA955X_LS_BLINK1	0x3	/* Blink at PWM1 rate */
+
+#define PCA955X_GPIO_INPUT	LED_OFF
+#define PCA955X_GPIO_HIGH	LED_OFF
+#define PCA955X_GPIO_LOW	LED_FULL
+
+enum pca955x_type {
+	pca9550,
+	pca9551,
+	pca9552,
+	pca9553,
+};
+
+struct pca955x_chipdef {
+	int			bits;
+	u8			slv_addr;	/* 7-bit slave address mask */
+	int			slv_addr_shift;	/* Number of bits to ignore */
+};
+
+static struct pca955x_chipdef pca955x_chipdefs[] = {
+	[pca9550] = {
+		.bits		= 2,
+		.slv_addr	= /* 110000x */ 0x60,
+		.slv_addr_shift	= 1,
+	},
+	[pca9551] = {
+		.bits		= 8,
+		.slv_addr	= /* 1100xxx */ 0x60,
+		.slv_addr_shift	= 3,
+	},
+	[pca9552] = {
+		.bits		= 16,
+		.slv_addr	= /* 1100xxx */ 0x60,
+		.slv_addr_shift	= 3,
+	},
+	[pca9553] = {
+		.bits		= 4,
+		.slv_addr	= /* 110001x */ 0x62,
+		.slv_addr_shift	= 1,
+	},
+};
+
+static const struct i2c_device_id pca955x_id[] = {
+	{ "pca9550", pca9550 },
+	{ "pca9551", pca9551 },
+	{ "pca9552", pca9552 },
+	{ "pca9553", pca9553 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, pca955x_id);
+
+static const struct acpi_device_id pca955x_acpi_ids[] = {
+	{ "PCA9550",  pca9550 },
+	{ "PCA9551",  pca9551 },
+	{ "PCA9552",  pca9552 },
+	{ "PCA9553",  pca9553 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, pca955x_acpi_ids);
+
+struct pca955x {
+	struct mutex lock;
+	struct pca955x_led *leds;
+	struct pca955x_chipdef	*chipdef;
+	struct i2c_client	*client;
+#ifdef CONFIG_LEDS_PCA955X_GPIO
+	struct gpio_chip gpio;
+#endif
+};
+
+struct pca955x_led {
+	struct pca955x	*pca955x;
+	struct led_classdev	led_cdev;
+	int			led_num;	/* 0 .. 15 potentially */
+	char			name[32];
+	u32			type;
+	const char		*default_trigger;
+};
+
+struct pca955x_platform_data {
+	struct pca955x_led	*leds;
+	int			num_leds;
+};
+
+/* 8 bits per input register */
+static inline int pca95xx_num_input_regs(int bits)
+{
+	return (bits + 7) / 8;
+}
+
+/* 4 bits per LED selector register */
+static inline int pca95xx_num_led_regs(int bits)
+{
+	return (bits + 3)  / 4;
+}
+
+/*
+ * Return an LED selector register value based on an existing one, with
+ * the appropriate 2-bit state value set for the given LED number (0-3).
+ */
+static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
+{
+	return (oldval & (~(0x3 << (led_num << 1)))) |
+		((state & 0x3) << (led_num << 1));
+}
+
+/*
+ * Write to frequency prescaler register, used to program the
+ * period of the PWM output.  period = (PSCx + 1) / 38
+ */
+static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(client,
+		pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n,
+		val);
+	if (ret < 0)
+		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
+			__func__, n, val, ret);
+	return ret;
+}
+
+/*
+ * Write to PWM register, which determines the duty cycle of the
+ * output.  LED is OFF when the count is less than the value of this
+ * register, and ON when it is greater.  If PWMx == 0, LED is always OFF.
+ *
+ * Duty cycle is (256 - PWMx) / 256
+ */
+static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(client,
+		pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n,
+		val);
+	if (ret < 0)
+		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
+			__func__, n, val, ret);
+	return ret;
+}
+
+/*
+ * Write to LED selector register, which determines the source that
+ * drives the LED output.
+ */
+static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(client,
+		pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n,
+		val);
+	if (ret < 0)
+		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
+			__func__, n, val, ret);
+	return ret;
+}
+
+/*
+ * Read the LED selector register, which determines the source that
+ * drives the LED output.
+ */
+static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(client,
+		pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n);
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
+			__func__, n, ret);
+		return ret;
+	}
+	*val = (u8)ret;
+	return 0;
+}
+
+static int pca955x_led_set(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	struct pca955x_led *pca955x_led;
+	struct pca955x *pca955x;
+	u8 ls;
+	int chip_ls;	/* which LSx to use (0-3 potentially) */
+	int ls_led;	/* which set of bits within LSx to use (0-3) */
+	int ret;
+
+	pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
+	pca955x = pca955x_led->pca955x;
+
+	chip_ls = pca955x_led->led_num / 4;
+	ls_led = pca955x_led->led_num % 4;
+
+	mutex_lock(&pca955x->lock);
+
+	ret = pca955x_read_ls(pca955x->client, chip_ls, &ls);
+	if (ret)
+		goto out;
+
+	switch (value) {
+	case LED_FULL:
+		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
+		break;
+	case LED_OFF:
+		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
+		break;
+	case LED_HALF:
+		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
+		break;
+	default:
+		/*
+		 * Use PWM1 for all other values.  This has the unwanted
+		 * side effect of making all LEDs on the chip share the
+		 * same brightness level if set to a value other than
+		 * OFF, HALF, or FULL.  But, this is probably better than
+		 * just turning off for all other values.
+		 */
+		ret = pca955x_write_pwm(pca955x->client, 1, 255 - value);
+		if (ret)
+			goto out;
+		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
+		break;
+	}
+
+	ret = pca955x_write_ls(pca955x->client, chip_ls, ls);
+
+out:
+	mutex_unlock(&pca955x->lock);
+
+	return ret;
+}
+
+#ifdef CONFIG_LEDS_PCA955X_GPIO
+/*
+ * Read the INPUT register, which contains the state of LEDs.
+ */
+static int pca955x_read_input(struct i2c_client *client, int n, u8 *val)
+{
+	int ret = i2c_smbus_read_byte_data(client, n);
+
+	if (ret < 0) {
+		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
+			__func__, n, ret);
+		return ret;
+	}
+	*val = (u8)ret;
+	return 0;
+
+}
+
+static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset)
+{
+	struct pca955x *pca955x = gpiochip_get_data(gc);
+	struct pca955x_led *led = &pca955x->leds[offset];
+
+	if (led->type == PCA955X_TYPE_GPIO)
+		return 0;
+
+	return -EBUSY;
+}
+
+static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset,
+			     int val)
+{
+	struct pca955x *pca955x = gpiochip_get_data(gc);
+	struct pca955x_led *led = &pca955x->leds[offset];
+
+	if (val)
+		return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH);
+
+	return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW);
+}
+
+static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset,
+				   int val)
+{
+	pca955x_set_value(gc, offset, val);
+}
+
+static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset)
+{
+	struct pca955x *pca955x = gpiochip_get_data(gc);
+	struct pca955x_led *led = &pca955x->leds[offset];
+	u8 reg = 0;
+
+	/* There is nothing we can do about errors */
+	pca955x_read_input(pca955x->client, led->led_num / 8, &reg);
+
+	return !!(reg & (1 << (led->led_num % 8)));
+}
+
+static int pca955x_gpio_direction_input(struct gpio_chip *gc,
+					unsigned int offset)
+{
+	struct pca955x *pca955x = gpiochip_get_data(gc);
+	struct pca955x_led *led = &pca955x->leds[offset];
+
+	/* To use as input ensure pin is not driven. */
+	return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_INPUT);
+}
+
+static int pca955x_gpio_direction_output(struct gpio_chip *gc,
+					 unsigned int offset, int val)
+{
+	return pca955x_set_value(gc, offset, val);
+}
+#endif /* CONFIG_LEDS_PCA955X_GPIO */
+
+#if IS_ENABLED(CONFIG_OF)
+static struct pca955x_platform_data *
+pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
+{
+	struct device_node *np = client->dev.of_node;
+	struct device_node *child;
+	struct pca955x_platform_data *pdata;
+	int count;
+
+	count = of_get_child_count(np);
+	if (!count || count > chip->bits)
+		return ERR_PTR(-ENODEV);
+
+	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	pdata->leds = devm_kcalloc(&client->dev,
+				   chip->bits, sizeof(struct pca955x_led),
+				   GFP_KERNEL);
+	if (!pdata->leds)
+		return ERR_PTR(-ENOMEM);
+
+	for_each_child_of_node(np, child) {
+		const char *name;
+		u32 reg;
+		int res;
+
+		res = of_property_read_u32(child, "reg", &reg);
+		if ((res != 0) || (reg >= chip->bits))
+			continue;
+
+		if (of_property_read_string(child, "label", &name))
+			name = child->name;
+
+		snprintf(pdata->leds[reg].name, sizeof(pdata->leds[reg].name),
+			 "%s", name);
+
+		pdata->leds[reg].type = PCA955X_TYPE_LED;
+		of_property_read_u32(child, "type", &pdata->leds[reg].type);
+		of_property_read_string(child, "linux,default-trigger",
+					&pdata->leds[reg].default_trigger);
+	}
+
+	pdata->num_leds = chip->bits;
+
+	return pdata;
+}
+
+static const struct of_device_id of_pca955x_match[] = {
+	{ .compatible = "nxp,pca9550", .data = (void *)pca9550 },
+	{ .compatible = "nxp,pca9551", .data = (void *)pca9551 },
+	{ .compatible = "nxp,pca9552", .data = (void *)pca9552 },
+	{ .compatible = "nxp,pca9553", .data = (void *)pca9553 },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_pca955x_match);
+#else
+static struct pca955x_platform_data *
+pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
+{
+	return ERR_PTR(-ENODEV);
+}
+#endif
+
+static int pca955x_probe(struct i2c_client *client,
+					const struct i2c_device_id *id)
+{
+	struct pca955x *pca955x;
+	struct pca955x_led *pca955x_led;
+	struct pca955x_chipdef *chip;
+	struct i2c_adapter *adapter;
+	int i, err;
+	struct pca955x_platform_data *pdata;
+	int ngpios = 0;
+
+	if (id) {
+		chip = &pca955x_chipdefs[id->driver_data];
+	} else {
+		const struct acpi_device_id *acpi_id;
+
+		acpi_id = acpi_match_device(pca955x_acpi_ids, &client->dev);
+		if (!acpi_id)
+			return -ENODEV;
+		chip = &pca955x_chipdefs[acpi_id->driver_data];
+	}
+	adapter = to_i2c_adapter(client->dev.parent);
+	pdata = dev_get_platdata(&client->dev);
+	if (!pdata) {
+		pdata =	pca955x_pdata_of_init(client, chip);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	}
+
+	/* Make sure the slave address / chip type combo given is possible */
+	if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
+	    chip->slv_addr) {
+		dev_err(&client->dev, "invalid slave address %02x\n",
+				client->addr);
+		return -ENODEV;
+	}
+
+	dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at "
+			"slave address 0x%02x\n",
+			client->name, chip->bits, client->addr);
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -EIO;
+
+	if (pdata->num_leds != chip->bits) {
+		dev_err(&client->dev,
+			"board info claims %d LEDs on a %d-bit chip\n",
+			pdata->num_leds, chip->bits);
+		return -ENODEV;
+	}
+
+	pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL);
+	if (!pca955x)
+		return -ENOMEM;
+
+	pca955x->leds = devm_kcalloc(&client->dev,
+			chip->bits, sizeof(*pca955x_led), GFP_KERNEL);
+	if (!pca955x->leds)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, pca955x);
+
+	mutex_init(&pca955x->lock);
+	pca955x->client = client;
+	pca955x->chipdef = chip;
+
+	for (i = 0; i < chip->bits; i++) {
+		pca955x_led = &pca955x->leds[i];
+		pca955x_led->led_num = i;
+		pca955x_led->pca955x = pca955x;
+		pca955x_led->type = pdata->leds[i].type;
+
+		switch (pca955x_led->type) {
+		case PCA955X_TYPE_NONE:
+			break;
+		case PCA955X_TYPE_GPIO:
+			ngpios++;
+			break;
+		case PCA955X_TYPE_LED:
+			/*
+			 * Platform data can specify LED names and
+			 * default triggers
+			 */
+			if (pdata->leds[i].name[0] == '\0')
+				snprintf(pdata->leds[i].name,
+					sizeof(pdata->leds[i].name), "%d", i);
+
+			snprintf(pca955x_led->name,
+				sizeof(pca955x_led->name), "pca955x:%s",
+				pdata->leds[i].name);
+
+			if (pdata->leds[i].default_trigger)
+				pca955x_led->led_cdev.default_trigger =
+					pdata->leds[i].default_trigger;
+
+			pca955x_led->led_cdev.name = pca955x_led->name;
+			pca955x_led->led_cdev.brightness_set_blocking =
+				pca955x_led_set;
+
+			err = devm_led_classdev_register(&client->dev,
+							&pca955x_led->led_cdev);
+			if (err)
+				return err;
+
+			/* Turn off LED */
+			err = pca955x_led_set(&pca955x_led->led_cdev, LED_OFF);
+			if (err)
+				return err;
+		}
+	}
+
+	/* PWM0 is used for half brightness or 50% duty cycle */
+	err = pca955x_write_pwm(client, 0, 255 - LED_HALF);
+	if (err)
+		return err;
+
+	/* PWM1 is used for variable brightness, default to OFF */
+	err = pca955x_write_pwm(client, 1, 0);
+	if (err)
+		return err;
+
+	/* Set to fast frequency so we do not see flashing */
+	err = pca955x_write_psc(client, 0, 0);
+	if (err)
+		return err;
+	err = pca955x_write_psc(client, 1, 0);
+	if (err)
+		return err;
+
+#ifdef CONFIG_LEDS_PCA955X_GPIO
+	if (ngpios) {
+		pca955x->gpio.label = "gpio-pca955x";
+		pca955x->gpio.direction_input = pca955x_gpio_direction_input;
+		pca955x->gpio.direction_output = pca955x_gpio_direction_output;
+		pca955x->gpio.set = pca955x_gpio_set_value;
+		pca955x->gpio.get = pca955x_gpio_get_value;
+		pca955x->gpio.request = pca955x_gpio_request_pin;
+		pca955x->gpio.can_sleep = 1;
+		pca955x->gpio.base = -1;
+		pca955x->gpio.ngpio = ngpios;
+		pca955x->gpio.parent = &client->dev;
+		pca955x->gpio.owner = THIS_MODULE;
+
+		err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio,
+					     pca955x);
+		if (err) {
+			/* Use data->gpio.dev as a flag for freeing gpiochip */
+			pca955x->gpio.parent = NULL;
+			dev_warn(&client->dev, "could not add gpiochip\n");
+			return err;
+		}
+		dev_info(&client->dev, "gpios %i...%i\n",
+			 pca955x->gpio.base, pca955x->gpio.base +
+			 pca955x->gpio.ngpio - 1);
+	}
+#endif
+
+	return 0;
+}
+
+static struct i2c_driver pca955x_driver = {
+	.driver = {
+		.name	= "leds-pca955x",
+		.acpi_match_table = ACPI_PTR(pca955x_acpi_ids),
+		.of_match_table = of_match_ptr(of_pca955x_match),
+	},
+	.probe	= pca955x_probe,
+	.id_table = pca955x_id,
+};
+
+module_i2c_driver(pca955x_driver);
+
+MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
+MODULE_DESCRIPTION("PCA955x LED driver");
+MODULE_LICENSE("GPL v2");