[mirror_ubuntu-artful-kernel.git] / drivers / leds / leds-pca963x.c

/*
 * Copyright 2011 bct electronic GmbH
 * Copyright 2013 Qtechnology/AS
 *
 * Author: Peter Meerwald <p.meerwald@bct-electronic.com>
 * Author: Ricardo Ribalda <ricardo.ribalda@gmail.com>
 *
 * Based on leds-pca955x.c
 *
 * 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 the PCA9633 I2C LED driver (7-bit slave address 0x62)
 * LED driver for the PCA9634 I2C LED driver (7-bit slave address set by hw.)
 *
 * Note that hardware blinking violates the leds infrastructure driver
 * interface since the hardware only supports blinking all LEDs with the
 * same delay_on/delay_off rates.  That is, only the LEDs that are set to
 * blink will actually blink but all LEDs that are set to blink will blink
 * in identical fashion.  The delay_on/delay_off values of the last LED
 * that is set to blink will be used for all of the blinking LEDs.
 * Hardware blinking is disabled by default but can be enabled by setting
 * the 'blink_type' member in the platform_data struct to 'PCA963X_HW_BLINK'
 * or by adding the 'nxp,hw-blink' property to the DTS.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/platform_data/leds-pca963x.h>

/* LED select registers determine the source that drives LED outputs */
#define PCA963X_LED_OFF		0x0	/* LED driver off */
#define PCA963X_LED_ON		0x1	/* LED driver on */
#define PCA963X_LED_PWM		0x2	/* Controlled through PWM */
#define PCA963X_LED_GRP_PWM	0x3	/* Controlled through PWM/GRPPWM */

#define PCA963X_MODE2_DMBLNK	0x20	/* Enable blinking */

#define PCA963X_MODE1		0x00
#define PCA963X_MODE2		0x01
#define PCA963X_PWM_BASE	0x02

enum pca963x_type {
	pca9633,
	pca9634,
};

struct pca963x_chipdef {
	u8			grppwm;
	u8			grpfreq;
	u8			ledout_base;
	int			n_leds;
};

static struct pca963x_chipdef pca963x_chipdefs[] = {
	[pca9633] = {
		.grppwm		= 0x6,
		.grpfreq	= 0x7,
		.ledout_base	= 0x8,
		.n_leds		= 4,
	},
	[pca9634] = {
		.grppwm		= 0xa,
		.grpfreq	= 0xb,
		.ledout_base	= 0xc,
		.n_leds		= 8,
	},
};

/* Total blink period in milliseconds */
#define PCA963X_BLINK_PERIOD_MIN	42
#define PCA963X_BLINK_PERIOD_MAX	10667

static const struct i2c_device_id pca963x_id[] = {
	{ "pca9632", pca9633 },
	{ "pca9633", pca9633 },
	{ "pca9634", pca9634 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pca963x_id);

enum pca963x_cmd {
	BRIGHTNESS_SET,
	BLINK_SET,
};

struct pca963x_led;

struct pca963x {
	struct pca963x_chipdef *chipdef;
	struct mutex mutex;
	struct i2c_client *client;
	struct pca963x_led *leds;
};

struct pca963x_led {
	struct pca963x *chip;
	struct work_struct work;
	enum led_brightness brightness;
	struct led_classdev led_cdev;
	int led_num; /* 0 .. 7 potentially */
	enum pca963x_cmd cmd;
	char name[32];
	u8 gdc;
	u8 gfrq;
};

static void pca963x_brightness_work(struct pca963x_led *pca963x)
{
	u8 ledout_addr = pca963x->chip->chipdef->ledout_base
		+ (pca963x->led_num / 4);
	u8 ledout;
	int shift = 2 * (pca963x->led_num % 4);
	u8 mask = 0x3 << shift;

	mutex_lock(&pca963x->chip->mutex);
	ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
	switch (pca963x->brightness) {
	case LED_FULL:
		i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
			(ledout & ~mask) | (PCA963X_LED_ON << shift));
		break;
	case LED_OFF:
		i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
			ledout & ~mask);
		break;
	default:
		i2c_smbus_write_byte_data(pca963x->chip->client,
			PCA963X_PWM_BASE + pca963x->led_num,
			pca963x->brightness);
		i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
			(ledout & ~mask) | (PCA963X_LED_PWM << shift));
		break;
	}
	mutex_unlock(&pca963x->chip->mutex);
}

static void pca963x_blink_work(struct pca963x_led *pca963x)
{
	u8 ledout_addr = pca963x->chip->chipdef->ledout_base +
		(pca963x->led_num / 4);
	u8 ledout;
	u8 mode2 = i2c_smbus_read_byte_data(pca963x->chip->client,
							PCA963X_MODE2);
	int shift = 2 * (pca963x->led_num % 4);
	u8 mask = 0x3 << shift;

	i2c_smbus_write_byte_data(pca963x->chip->client,
			pca963x->chip->chipdef->grppwm,	pca963x->gdc);

	i2c_smbus_write_byte_data(pca963x->chip->client,
			pca963x->chip->chipdef->grpfreq, pca963x->gfrq);

	if (!(mode2 & PCA963X_MODE2_DMBLNK))
		i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE2,
			mode2 | PCA963X_MODE2_DMBLNK);

	mutex_lock(&pca963x->chip->mutex);
	ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
	if ((ledout & mask) != (PCA963X_LED_GRP_PWM << shift))
		i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
			(ledout & ~mask) | (PCA963X_LED_GRP_PWM << shift));
	mutex_unlock(&pca963x->chip->mutex);
}

static void pca963x_work(struct work_struct *work)
{
	struct pca963x_led *pca963x = container_of(work,
		struct pca963x_led, work);

	switch (pca963x->cmd) {
	case BRIGHTNESS_SET:
		pca963x_brightness_work(pca963x);
		break;
	case BLINK_SET:
		pca963x_blink_work(pca963x);
		break;
	}
}

static void pca963x_led_set(struct led_classdev *led_cdev,
	enum led_brightness value)
{
	struct pca963x_led *pca963x;

	pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);

	pca963x->cmd = BRIGHTNESS_SET;
	pca963x->brightness = value;

	/*
	 * Must use workqueue for the actual I/O since I2C operations
	 * can sleep.
	 */
	schedule_work(&pca963x->work);
}

static int pca963x_blink_set(struct led_classdev *led_cdev,
		unsigned long *delay_on, unsigned long *delay_off)
{
	struct pca963x_led *pca963x;
	unsigned long time_on, time_off, period;
	u8 gdc, gfrq;

	pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);

	time_on = *delay_on;
	time_off = *delay_off;

	/* If both zero, pick reasonable defaults of 500ms each */
	if (!time_on && !time_off) {
		time_on = 500;
		time_off = 500;
	}

	period = time_on + time_off;

	/* If period not supported by hardware, default to someting sane. */
	if ((period < PCA963X_BLINK_PERIOD_MIN) ||
	    (period > PCA963X_BLINK_PERIOD_MAX)) {
		time_on = 500;
		time_off = 500;
		period = time_on + time_off;
	}

	/*
	 * From manual: duty cycle = (GDC / 256) ->
	 *	(time_on / period) = (GDC / 256) ->
	 *		GDC = ((time_on * 256) / period)
	 */
	gdc = (time_on * 256) / period;

	/*
	 * From manual: period = ((GFRQ + 1) / 24) in seconds.
	 * So, period (in ms) = (((GFRQ + 1) / 24) * 1000) ->
	 *		GFRQ = ((period * 24 / 1000) - 1)
	 */
	gfrq = (period * 24 / 1000) - 1;

	pca963x->cmd = BLINK_SET;
	pca963x->gdc = gdc;
	pca963x->gfrq = gfrq;

	/*
	 * Must use workqueue for the actual I/O since I2C operations
	 * can sleep.
	 */
	schedule_work(&pca963x->work);

	*delay_on = time_on;
	*delay_off = time_off;

	return 0;
}

#if IS_ENABLED(CONFIG_OF)
static struct pca963x_platform_data *
pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
{
	struct device_node *np = client->dev.of_node, *child;
	struct pca963x_platform_data *pdata;
	struct led_info *pca963x_leds;
	int count;

	count = of_get_child_count(np);
	if (!count || count > chip->n_leds)
		return ERR_PTR(-ENODEV);

	pca963x_leds = devm_kzalloc(&client->dev,
			sizeof(struct led_info) * chip->n_leds, GFP_KERNEL);
	if (!pca963x_leds)
		return ERR_PTR(-ENOMEM);

	for_each_child_of_node(np, child) {
		struct led_info led;
		u32 reg;
		int res;

		led.name =
			of_get_property(child, "label", NULL) ? : child->name;
		led.default_trigger =
			of_get_property(child, "linux,default-trigger", NULL);
		res = of_property_read_u32(child, "reg", &reg);
		if (res != 0)
			continue;
		pca963x_leds[reg] = led;
	}
	pdata = devm_kzalloc(&client->dev,
			     sizeof(struct pca963x_platform_data), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	pdata->leds.leds = pca963x_leds;
	pdata->leds.num_leds = count;

	/* default to open-drain unless totem pole (push-pull) is specified */
	if (of_property_read_bool(np, "nxp,totem-pole"))
		pdata->outdrv = PCA963X_TOTEM_POLE;
	else
		pdata->outdrv = PCA963X_OPEN_DRAIN;

	/* default to software blinking unless hardware blinking is specified */
	if (of_property_read_bool(np, "nxp,hw-blink"))
		pdata->blink_type = PCA963X_HW_BLINK;
	else
		pdata->blink_type = PCA963X_SW_BLINK;

	return pdata;
}

static const struct of_device_id of_pca963x_match[] = {
	{ .compatible = "nxp,pca9632", },
	{ .compatible = "nxp,pca9633", },
	{ .compatible = "nxp,pca9634", },
	{},
};
#else
static struct pca963x_platform_data *
pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
{
	return ERR_PTR(-ENODEV);
}
#endif

static int pca963x_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	struct pca963x *pca963x_chip;
	struct pca963x_led *pca963x;
	struct pca963x_platform_data *pdata;
	struct pca963x_chipdef *chip;
	int i, err;

	chip = &pca963x_chipdefs[id->driver_data];
	pdata = dev_get_platdata(&client->dev);

	if (!pdata) {
		pdata = pca963x_dt_init(client, chip);
		if (IS_ERR(pdata)) {
			dev_warn(&client->dev, "could not parse configuration\n");
			pdata = NULL;
		}
	}

	if (pdata && (pdata->leds.num_leds < 1 ||
				 pdata->leds.num_leds > chip->n_leds)) {
		dev_err(&client->dev, "board info must claim 1-%d LEDs",
								chip->n_leds);
		return -EINVAL;
	}

	pca963x_chip = devm_kzalloc(&client->dev, sizeof(*pca963x_chip),
								GFP_KERNEL);
	if (!pca963x_chip)
		return -ENOMEM;
	pca963x = devm_kzalloc(&client->dev, chip->n_leds * sizeof(*pca963x),
								GFP_KERNEL);
	if (!pca963x)
		return -ENOMEM;

	i2c_set_clientdata(client, pca963x_chip);

	mutex_init(&pca963x_chip->mutex);
	pca963x_chip->chipdef = chip;
	pca963x_chip->client = client;
	pca963x_chip->leds = pca963x;

	/* Turn off LEDs by default*/
	i2c_smbus_write_byte_data(client, chip->ledout_base, 0x00);
	if (chip->n_leds > 4)
		i2c_smbus_write_byte_data(client, chip->ledout_base + 1, 0x00);

	for (i = 0; i < chip->n_leds; i++) {
		pca963x[i].led_num = i;
		pca963x[i].chip = pca963x_chip;

		/* Platform data can specify LED names and default triggers */
		if (pdata && i < pdata->leds.num_leds) {
			if (pdata->leds.leds[i].name)
				snprintf(pca963x[i].name,
					 sizeof(pca963x[i].name), "pca963x:%s",
					 pdata->leds.leds[i].name);
			if (pdata->leds.leds[i].default_trigger)
				pca963x[i].led_cdev.default_trigger =
					pdata->leds.leds[i].default_trigger;
		}
		if (!pdata || i >= pdata->leds.num_leds ||
						!pdata->leds.leds[i].name)
			snprintf(pca963x[i].name, sizeof(pca963x[i].name),
				 "pca963x:%d:%.2x:%d", client->adapter->nr,
				 client->addr, i);

		pca963x[i].led_cdev.name = pca963x[i].name;
		pca963x[i].led_cdev.brightness_set = pca963x_led_set;

		if (pdata && pdata->blink_type == PCA963X_HW_BLINK)
			pca963x[i].led_cdev.blink_set = pca963x_blink_set;

		INIT_WORK(&pca963x[i].work, pca963x_work);

		err = led_classdev_register(&client->dev, &pca963x[i].led_cdev);
		if (err < 0)
			goto exit;
	}

	/* Disable LED all-call address and set normal mode */
	i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00);

	/* Configure output: open-drain or totem pole (push-pull) */
	if (pdata && pdata->outdrv == PCA963X_OPEN_DRAIN)
		i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x01);

	return 0;

exit:
	while (i--) {
		led_classdev_unregister(&pca963x[i].led_cdev);
		cancel_work_sync(&pca963x[i].work);
	}

	return err;
}

static int pca963x_remove(struct i2c_client *client)
{
	struct pca963x *pca963x = i2c_get_clientdata(client);
	int i;

	for (i = 0; i < pca963x->chipdef->n_leds; i++) {
		led_classdev_unregister(&pca963x->leds[i].led_cdev);
		cancel_work_sync(&pca963x->leds[i].work);
	}

	return 0;
}

static struct i2c_driver pca963x_driver = {
	.driver = {
		.name	= "leds-pca963x",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(of_pca963x_match),
	},
	.probe	= pca963x_probe,
	.remove	= pca963x_remove,
	.id_table = pca963x_id,
};

module_i2c_driver(pca963x_driver);

MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>");
MODULE_DESCRIPTION("PCA963X LED driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
75cb2e1d PM	1	/*
75cb2e1d PM	2	* Copyright 2011 bct electronic GmbH
af67384f	3	* Copyright 2013 Qtechnology/AS
75cb2e1d PM	4	*
75cb2e1d PM	5	* Author: Peter Meerwald <p.meerwald@bct-electronic.com>
af67384f	6	* Author: Ricardo Ribalda <ricardo.ribalda@gmail.com>
75cb2e1d PM	7	*
	8	* Based on leds-pca955x.c
	9	*
	10	* This file is subject to the terms and conditions of version 2 of
	11	* the GNU General Public License. See the file COPYING in the main
	12	* directory of this archive for more details.
	13	*
	14	* LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62)
af67384f	15	* LED driver for the PCA9634 I2C LED driver (7-bit slave address set by hw.)
75cb2e1d	16	*
8465b018 MG	17	* Note that hardware blinking violates the leds infrastructure driver
	18	* interface since the hardware only supports blinking all LEDs with the
	19	* same delay_on/delay_off rates. That is, only the LEDs that are set to
	20	* blink will actually blink but all LEDs that are set to blink will blink
	21	* in identical fashion. The delay_on/delay_off values of the last LED
	22	* that is set to blink will be used for all of the blinking LEDs.
	23	* Hardware blinking is disabled by default but can be enabled by setting
56a1740c	24	* the 'blink_type' member in the platform_data struct to 'PCA963X_HW_BLINK'
8465b018	25	* or by adding the 'nxp,hw-blink' property to the DTS.
75cb2e1d PM	26	*/
	27
	28	#include <linux/module.h>
	29	#include <linux/delay.h>
	30	#include <linux/string.h>
	31	#include <linux/ctype.h>
	32	#include <linux/leds.h>
	33	#include <linux/err.h>
	34	#include <linux/i2c.h>
	35	#include <linux/workqueue.h>
	36	#include <linux/slab.h>
81d22878	37	#include <linux/of.h>
56a1740c	38	#include <linux/platform_data/leds-pca963x.h>
75cb2e1d PM	39
75cb2e1d PM	40	/* LED select registers determine the source that drives LED outputs */
56a1740c RRD	41	#define PCA963X_LED_OFF 0x0 /* LED driver off */
	42	#define PCA963X_LED_ON 0x1 /* LED driver on */
	43	#define PCA963X_LED_PWM 0x2 /* Controlled through PWM */
	44	#define PCA963X_LED_GRP_PWM 0x3 /* Controlled through PWM/GRPPWM */
75cb2e1d	45
56a1740c	46	#define PCA963X_MODE2_DMBLNK 0x20 /* Enable blinking */
8465b018	47
56a1740c RRD	48	#define PCA963X_MODE1 0x00
	49	#define PCA963X_MODE2 0x01
	50	#define PCA963X_PWM_BASE 0x02
af67384f	51
56a1740c	52	enum pca963x_type {
af67384f RRD	53	pca9633,
	54	pca9634,
	55	};
	56
56a1740c	57	struct pca963x_chipdef {
af67384f RRD	58	u8 grppwm;
	59	u8 grpfreq;
	60	u8 ledout_base;
	61	int n_leds;
	62	};
	63
56a1740c	64	static struct pca963x_chipdef pca963x_chipdefs[] = {
af67384f RRD	65	[pca9633] = {
	66	.grppwm = 0x6,
	67	.grpfreq = 0x7,
	68	.ledout_base = 0x8,
	69	.n_leds = 4,
	70	},
	71	[pca9634] = {
	72	.grppwm = 0xa,
	73	.grpfreq = 0xb,
	74	.ledout_base = 0xc,
	75	.n_leds = 8,
	76	},
	77	};
75cb2e1d	78
8465b018	79	/* Total blink period in milliseconds */
56a1740c RRD	80	#define PCA963X_BLINK_PERIOD_MIN 42
56a1740c RRD	81	#define PCA963X_BLINK_PERIOD_MAX 10667
8465b018	82
56a1740c	83	static const struct i2c_device_id pca963x_id[] = {
af67384f RRD	84	{ "pca9632", pca9633 },
	85	{ "pca9633", pca9633 },
	86	{ "pca9634", pca9634 },
75cb2e1d PM	87	{ }
75cb2e1d PM	88	};
56a1740c	89	MODULE_DEVICE_TABLE(i2c, pca963x_id);
75cb2e1d	90
56a1740c	91	enum pca963x_cmd {
8465b018 MG	92	BRIGHTNESS_SET,
	93	BLINK_SET,
	94	};
	95
56a1740c	96	struct pca963x_led;
a7d0e988	97
56a1740c RRD	98	struct pca963x {
56a1740c RRD	99	struct pca963x_chipdef *chipdef;
a7d0e988 RRD	100	struct mutex mutex;
a7d0e988 RRD	101	struct i2c_client *client;
56a1740c	102	struct pca963x_led *leds;
a7d0e988 RRD	103	};
a7d0e988 RRD	104
56a1740c RRD	105	struct pca963x_led {
56a1740c RRD	106	struct pca963x *chip;
75cb2e1d PM	107	struct work_struct work;
	108	enum led_brightness brightness;
	109	struct led_classdev led_cdev;
af67384f	110	int led_num; /* 0 .. 7 potentially */
56a1740c	111	enum pca963x_cmd cmd;
75cb2e1d	112	char name[32];
8465b018 MG	113	u8 gdc;
8465b018 MG	114	u8 gfrq;
75cb2e1d PM	115	};
75cb2e1d PM	116
56a1740c	117	static void pca963x_brightness_work(struct pca963x_led *pca963x)
75cb2e1d	118	{
56a1740c RRD	119	u8 ledout_addr = pca963x->chip->chipdef->ledout_base
56a1740c RRD	120	+ (pca963x->led_num / 4);
af67384f	121	u8 ledout;
56a1740c	122	int shift = 2 * (pca963x->led_num % 4);
75cb2e1d PM	123	u8 mask = 0x3 << shift;
75cb2e1d PM	124
56a1740c RRD	125	mutex_lock(&pca963x->chip->mutex);
	126	ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
	127	switch (pca963x->brightness) {
75cb2e1d	128	case LED_FULL:
56a1740c RRD	129	i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
56a1740c RRD	130	(ledout & ~mask) \| (PCA963X_LED_ON << shift));
75cb2e1d PM	131	break;
75cb2e1d PM	132	case LED_OFF:
56a1740c	133	i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
75cb2e1d PM	134	ledout & ~mask);
	135	break;
	136	default:
56a1740c RRD	137	i2c_smbus_write_byte_data(pca963x->chip->client,
	138	PCA963X_PWM_BASE + pca963x->led_num,
	139	pca963x->brightness);
	140	i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
	141	(ledout & ~mask) \| (PCA963X_LED_PWM << shift));
75cb2e1d PM	142	break;
75cb2e1d PM	143	}
56a1740c	144	mutex_unlock(&pca963x->chip->mutex);
75cb2e1d PM	145	}
75cb2e1d PM	146
56a1740c	147	static void pca963x_blink_work(struct pca963x_led *pca963x)
8465b018	148	{
56a1740c RRD	149	u8 ledout_addr = pca963x->chip->chipdef->ledout_base +
56a1740c RRD	150	(pca963x->led_num / 4);
a7d0e988	151	u8 ledout;
56a1740c RRD	152	u8 mode2 = i2c_smbus_read_byte_data(pca963x->chip->client,
	153	PCA963X_MODE2);
	154	int shift = 2 * (pca963x->led_num % 4);
8465b018 MG	155	u8 mask = 0x3 << shift;
8465b018 MG	156
56a1740c RRD	157	i2c_smbus_write_byte_data(pca963x->chip->client,
56a1740c RRD	158	pca963x->chip->chipdef->grppwm, pca963x->gdc);
8465b018	159
56a1740c RRD	160	i2c_smbus_write_byte_data(pca963x->chip->client,
56a1740c RRD	161	pca963x->chip->chipdef->grpfreq, pca963x->gfrq);
8465b018	162
56a1740c RRD	163	if (!(mode2 & PCA963X_MODE2_DMBLNK))
	164	i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE2,
	165	mode2 \| PCA963X_MODE2_DMBLNK);
8465b018	166
56a1740c RRD	167	mutex_lock(&pca963x->chip->mutex);
	168	ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
	169	if ((ledout & mask) != (PCA963X_LED_GRP_PWM << shift))
	170	i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
	171	(ledout & ~mask) \| (PCA963X_LED_GRP_PWM << shift));
	172	mutex_unlock(&pca963x->chip->mutex);
8465b018 MG	173	}
8465b018 MG	174
56a1740c	175	static void pca963x_work(struct work_struct *work)
8465b018	176	{
56a1740c RRD	177	struct pca963x_led *pca963x = container_of(work,
56a1740c RRD	178	struct pca963x_led, work);
8465b018	179
56a1740c	180	switch (pca963x->cmd) {
8465b018	181	case BRIGHTNESS_SET:
56a1740c	182	pca963x_brightness_work(pca963x);
8465b018 MG	183	break;
8465b018 MG	184	case BLINK_SET:
56a1740c	185	pca963x_blink_work(pca963x);
8465b018 MG	186	break;
	187	}
	188	}
	189
56a1740c	190	static void pca963x_led_set(struct led_classdev *led_cdev,
75cb2e1d PM	191	enum led_brightness value)
75cb2e1d PM	192	{
56a1740c	193	struct pca963x_led *pca963x;
75cb2e1d	194
56a1740c	195	pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
75cb2e1d	196
56a1740c RRD	197	pca963x->cmd = BRIGHTNESS_SET;
56a1740c RRD	198	pca963x->brightness = value;
75cb2e1d PM	199
	200	/*
	201	* Must use workqueue for the actual I/O since I2C operations
	202	* can sleep.
	203	*/
56a1740c	204	schedule_work(&pca963x->work);
75cb2e1d PM	205	}
75cb2e1d PM	206
56a1740c	207	static int pca963x_blink_set(struct led_classdev *led_cdev,
8465b018 MG	208	unsigned long delay_on, unsigned long delay_off)
8465b018 MG	209	{
56a1740c	210	struct pca963x_led *pca963x;
8465b018 MG	211	unsigned long time_on, time_off, period;
	212	u8 gdc, gfrq;
	213
56a1740c	214	pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
8465b018 MG	215
	216	time_on = *delay_on;
	217	time_off = *delay_off;
	218
	219	/* If both zero, pick reasonable defaults of 500ms each */
	220	if (!time_on && !time_off) {
	221	time_on = 500;
	222	time_off = 500;
	223	}
	224
	225	period = time_on + time_off;
	226
	227	/* If period not supported by hardware, default to someting sane. */
56a1740c RRD	228	if ((period < PCA963X_BLINK_PERIOD_MIN) \|\|
56a1740c RRD	229	(period > PCA963X_BLINK_PERIOD_MAX)) {
8465b018 MG	230	time_on = 500;
	231	time_off = 500;
	232	period = time_on + time_off;
	233	}
	234
	235	/*
	236	* From manual: duty cycle = (GDC / 256) ->
	237	* (time_on / period) = (GDC / 256) ->
	238	* GDC = ((time_on * 256) / period)
	239	*/
	240	gdc = (time_on * 256) / period;
	241
	242	/*
	243	* From manual: period = ((GFRQ + 1) / 24) in seconds.
	244	* So, period (in ms) = (((GFRQ + 1) / 24) * 1000) ->
	245	* GFRQ = ((period * 24 / 1000) - 1)
	246	*/
	247	gfrq = (period * 24 / 1000) - 1;
	248
56a1740c RRD	249	pca963x->cmd = BLINK_SET;
	250	pca963x->gdc = gdc;
	251	pca963x->gfrq = gfrq;
8465b018 MG	252
	253	/*
	254	* Must use workqueue for the actual I/O since I2C operations
	255	* can sleep.
	256	*/
56a1740c	257	schedule_work(&pca963x->work);
8465b018 MG	258
	259	*delay_on = time_on;
	260	*delay_off = time_off;
	261
	262	return 0;
	263	}
	264
81d22878	265	#if IS_ENABLED(CONFIG_OF)
56a1740c RRD	266	static struct pca963x_platform_data *
56a1740c RRD	267	pca963x_dt_init(struct i2c_client client, struct pca963x_chipdef chip)
81d22878 TL	268	{
81d22878 TL	269	struct device_node np = client->dev.of_node, child;
56a1740c RRD	270	struct pca963x_platform_data *pdata;
56a1740c RRD	271	struct led_info *pca963x_leds;
81d22878 TL	272	int count;
	273
	274	count = of_get_child_count(np);
af67384f	275	if (!count \|\| count > chip->n_leds)
81d22878 TL	276	return ERR_PTR(-ENODEV);
81d22878 TL	277
56a1740c	278	pca963x_leds = devm_kzalloc(&client->dev,
af67384f	279	sizeof(struct led_info) * chip->n_leds, GFP_KERNEL);
56a1740c	280	if (!pca963x_leds)
81d22878 TL	281	return ERR_PTR(-ENOMEM);
	282
	283	for_each_child_of_node(np, child) {
	284	struct led_info led;
	285	u32 reg;
	286	int res;
	287
	288	led.name =
	289	of_get_property(child, "label", NULL) ? : child->name;
	290	led.default_trigger =
	291	of_get_property(child, "linux,default-trigger", NULL);
	292	res = of_property_read_u32(child, "reg", &reg);
	293	if (res != 0)
	294	continue;
56a1740c	295	pca963x_leds[reg] = led;
81d22878 TL	296	}
81d22878 TL	297	pdata = devm_kzalloc(&client->dev,
56a1740c	298	sizeof(struct pca963x_platform_data), GFP_KERNEL);
81d22878 TL	299	if (!pdata)
	300	return ERR_PTR(-ENOMEM);
	301
56a1740c	302	pdata->leds.leds = pca963x_leds;
81d22878 TL	303	pdata->leds.num_leds = count;
	304
	305	/* default to open-drain unless totem pole (push-pull) is specified */
	306	if (of_property_read_bool(np, "nxp,totem-pole"))
56a1740c	307	pdata->outdrv = PCA963X_TOTEM_POLE;
81d22878	308	else
56a1740c	309	pdata->outdrv = PCA963X_OPEN_DRAIN;
81d22878	310
8465b018 MG	311	/* default to software blinking unless hardware blinking is specified */
8465b018 MG	312	if (of_property_read_bool(np, "nxp,hw-blink"))
56a1740c	313	pdata->blink_type = PCA963X_HW_BLINK;
8465b018	314	else
56a1740c	315	pdata->blink_type = PCA963X_SW_BLINK;
8465b018	316
81d22878 TL	317	return pdata;
	318	}
	319
56a1740c	320	static const struct of_device_id of_pca963x_match[] = {
af67384f RRD	321	{ .compatible = "nxp,pca9632", },
	322	{ .compatible = "nxp,pca9633", },
	323	{ .compatible = "nxp,pca9634", },
81d22878 TL	324	{},
	325	};
	326	#else
56a1740c RRD	327	static struct pca963x_platform_data *
56a1740c RRD	328	pca963x_dt_init(struct i2c_client client, struct pca963x_chipdef chip)
81d22878 TL	329	{
	330	return ERR_PTR(-ENODEV);
	331	}
	332	#endif
	333
56a1740c	334	static int pca963x_probe(struct i2c_client *client,
75cb2e1d PM	335	const struct i2c_device_id *id)
75cb2e1d PM	336	{
56a1740c RRD	337	struct pca963x *pca963x_chip;
	338	struct pca963x_led *pca963x;
	339	struct pca963x_platform_data *pdata;
	340	struct pca963x_chipdef *chip;
75cb2e1d PM	341	int i, err;
75cb2e1d PM	342
56a1740c	343	chip = &pca963x_chipdefs[id->driver_data];
87aae1ea	344	pdata = dev_get_platdata(&client->dev);
75cb2e1d	345
81d22878	346	if (!pdata) {
56a1740c	347	pdata = pca963x_dt_init(client, chip);
81d22878 TL	348	if (IS_ERR(pdata)) {
	349	dev_warn(&client->dev, "could not parse configuration\n");
	350	pdata = NULL;
	351	}
	352	}
	353
af67384f RRD	354	if (pdata && (pdata->leds.num_leds < 1 \|\|
	355	pdata->leds.num_leds > chip->n_leds)) {
	356	dev_err(&client->dev, "board info must claim 1-%d LEDs",
	357	chip->n_leds);
	358	return -EINVAL;
75cb2e1d PM	359	}
75cb2e1d PM	360
56a1740c	361	pca963x_chip = devm_kzalloc(&client->dev, sizeof(*pca963x_chip),
a7d0e988	362	GFP_KERNEL);
56a1740c	363	if (!pca963x_chip)
a7d0e988	364	return -ENOMEM;
56a1740c	365	pca963x = devm_kzalloc(&client->dev, chip->n_leds * sizeof(*pca963x),
af67384f	366	GFP_KERNEL);
56a1740c	367	if (!pca963x)
75cb2e1d PM	368	return -ENOMEM;
75cb2e1d PM	369
56a1740c	370	i2c_set_clientdata(client, pca963x_chip);
a7d0e988	371
56a1740c RRD	372	mutex_init(&pca963x_chip->mutex);
	373	pca963x_chip->chipdef = chip;
	374	pca963x_chip->client = client;
	375	pca963x_chip->leds = pca963x;
a7d0e988 RRD	376
	377	/* Turn off LEDs by default*/
	378	i2c_smbus_write_byte_data(client, chip->ledout_base, 0x00);
	379	if (chip->n_leds > 4)
	380	i2c_smbus_write_byte_data(client, chip->ledout_base + 1, 0x00);
75cb2e1d	381
af67384f	382	for (i = 0; i < chip->n_leds; i++) {
56a1740c RRD	383	pca963x[i].led_num = i;
56a1740c RRD	384	pca963x[i].chip = pca963x_chip;
75cb2e1d PM	385
75cb2e1d PM	386	/* Platform data can specify LED names and default triggers */
2f73c392 PM	387	if (pdata && i < pdata->leds.num_leds) {
2f73c392 PM	388	if (pdata->leds.leds[i].name)
56a1740c RRD	389	snprintf(pca963x[i].name,
56a1740c RRD	390	sizeof(pca963x[i].name), "pca963x:%s",
2f73c392 PM	391	pdata->leds.leds[i].name);
2f73c392 PM	392	if (pdata->leds.leds[i].default_trigger)
56a1740c	393	pca963x[i].led_cdev.default_trigger =
2f73c392	394	pdata->leds.leds[i].default_trigger;
75cb2e1d	395	}
a5cd98b7 RRD	396	if (!pdata \|\| i >= pdata->leds.num_leds \|\|
a5cd98b7 RRD	397	!pdata->leds.leds[i].name)
56a1740c RRD	398	snprintf(pca963x[i].name, sizeof(pca963x[i].name),
56a1740c RRD	399	"pca963x:%d:%.2x:%d", client->adapter->nr,
a5cd98b7	400	client->addr, i);
75cb2e1d	401
56a1740c RRD	402	pca963x[i].led_cdev.name = pca963x[i].name;
56a1740c RRD	403	pca963x[i].led_cdev.brightness_set = pca963x_led_set;
75cb2e1d	404
56a1740c RRD	405	if (pdata && pdata->blink_type == PCA963X_HW_BLINK)
56a1740c RRD	406	pca963x[i].led_cdev.blink_set = pca963x_blink_set;
8465b018	407
56a1740c	408	INIT_WORK(&pca963x[i].work, pca963x_work);
75cb2e1d	409
56a1740c	410	err = led_classdev_register(&client->dev, &pca963x[i].led_cdev);
75cb2e1d PM	411	if (err < 0)
	412	goto exit;
	413	}
	414
	415	/* Disable LED all-call address and set normal mode */
56a1740c	416	i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00);
75cb2e1d	417
2f73c392	418	/* Configure output: open-drain or totem pole (push-pull) */
56a1740c RRD	419	if (pdata && pdata->outdrv == PCA963X_OPEN_DRAIN)
56a1740c RRD	420	i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x01);
2f73c392	421
75cb2e1d PM	422	return 0;
	423
	424	exit:
	425	while (i--) {
56a1740c RRD	426	led_classdev_unregister(&pca963x[i].led_cdev);
56a1740c RRD	427	cancel_work_sync(&pca963x[i].work);
75cb2e1d PM	428	}
75cb2e1d PM	429
75cb2e1d PM	430	return err;
	431	}
	432
56a1740c	433	static int pca963x_remove(struct i2c_client *client)
75cb2e1d	434	{
56a1740c	435	struct pca963x *pca963x = i2c_get_clientdata(client);
75cb2e1d PM	436	int i;
75cb2e1d PM	437
56a1740c RRD	438	for (i = 0; i < pca963x->chipdef->n_leds; i++) {
	439	led_classdev_unregister(&pca963x->leds[i].led_cdev);
	440	cancel_work_sync(&pca963x->leds[i].work);
a7d0e988	441	}
75cb2e1d	442
75cb2e1d PM	443	return 0;
	444	}
	445
56a1740c	446	static struct i2c_driver pca963x_driver = {
75cb2e1d	447	.driver = {
56a1740c	448	.name = "leds-pca963x",
75cb2e1d	449	.owner = THIS_MODULE,
56a1740c	450	.of_match_table = of_match_ptr(of_pca963x_match),
75cb2e1d	451	},
56a1740c RRD	452	.probe = pca963x_probe,
	453	.remove = pca963x_remove,
	454	.id_table = pca963x_id,
75cb2e1d PM	455	};
75cb2e1d PM	456
56a1740c	457	module_i2c_driver(pca963x_driver);
75cb2e1d PM	458
75cb2e1d PM	459	MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>");
56a1740c	460	MODULE_DESCRIPTION("PCA963X LED driver");
75cb2e1d	461	MODULE_LICENSE("GPL v2");