[mirror_ubuntu-artful-kernel.git] / drivers / leds / leds-pca955x.c

/*
 * 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/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/slab.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 */

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;
};

struct pca955x_led {
	struct pca955x	*pca955x;
	struct led_classdev	led_cdev;
	int			led_num;	/* 0 .. 15 potentially */
	char			name[32];
};

/* 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 void pca955x_write_psc(struct i2c_client *client, int n, u8 val)
{
	struct pca955x *pca955x = i2c_get_clientdata(client);

	i2c_smbus_write_byte_data(client,
		pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n,
		val);
}

/*
 * 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 void pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
{
	struct pca955x *pca955x = i2c_get_clientdata(client);

	i2c_smbus_write_byte_data(client,
		pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n,
		val);
}

/*
 * Write to LED selector register, which determines the source that
 * drives the LED output.
 */
static void pca955x_write_ls(struct i2c_client *client, int n, u8 val)
{
	struct pca955x *pca955x = i2c_get_clientdata(client);

	i2c_smbus_write_byte_data(client,
		pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n,
		val);
}

/*
 * Read the LED selector register, which determines the source that
 * drives the LED output.
 */
static u8 pca955x_read_ls(struct i2c_client *client, int n)
{
	struct pca955x *pca955x = i2c_get_clientdata(client);

	return (u8) i2c_smbus_read_byte_data(client,
		pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n);
}

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) */

	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);

	ls = pca955x_read_ls(pca955x->client, chip_ls);

	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.
		 */
		pca955x_write_pwm(pca955x->client, 1,
				255 - value);
		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
		break;
	}

	pca955x_write_ls(pca955x->client, chip_ls, ls);

	mutex_unlock(&pca955x->lock);

	return 0;
}

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;
	struct led_platform_data *pdata;
	int i, err;

	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);

	/* 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) {
		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_kzalloc(&client->dev,
			sizeof(*pca955x_led) * chip->bits, 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;

		/* Platform data can specify LED names and default triggers */
		if (pdata) {
			if (pdata->leds[i].name)
				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;
		} else {
			snprintf(pca955x_led->name, sizeof(pca955x_led->name),
				 "pca955x:%d", i);
		}

		pca955x_led->led_cdev.name = pca955x_led->name;
		pca955x_led->led_cdev.brightness_set_blocking = pca955x_led_set;

		err = led_classdev_register(&client->dev,
					&pca955x_led->led_cdev);
		if (err < 0)
			goto exit;
	}

	/* Turn off LEDs */
	for (i = 0; i < pca95xx_num_led_regs(chip->bits); i++)
		pca955x_write_ls(client, i, 0x55);

	/* PWM0 is used for half brightness or 50% duty cycle */
	pca955x_write_pwm(client, 0, 255-LED_HALF);

	/* PWM1 is used for variable brightness, default to OFF */
	pca955x_write_pwm(client, 1, 0);

	/* Set to fast frequency so we do not see flashing */
	pca955x_write_psc(client, 0, 0);
	pca955x_write_psc(client, 1, 0);

	return 0;

exit:
	while (i--)
		led_classdev_unregister(&pca955x->leds[i].led_cdev);

	return err;
}

static int pca955x_remove(struct i2c_client *client)
{
	struct pca955x *pca955x = i2c_get_clientdata(client);
	int i;

	for (i = 0; i < pca955x->chipdef->bits; i++)
		led_classdev_unregister(&pca955x->leds[i].led_cdev);

	return 0;
}

static struct i2c_driver pca955x_driver = {
	.driver = {
		.name	= "leds-pca955x",
		.acpi_match_table = ACPI_PTR(pca955x_acpi_ids),
	},
	.probe	= pca955x_probe,
	.remove	= pca955x_remove,
	.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");
Commit	Line	Data
f46e9203 NC	1	/*
	2	* Copyright 2007-2008 Extreme Engineering Solutions, Inc.
	3	*
	4	* Author: Nate Case <ncase@xes-inc.com>
	5	*
	6	* This file is subject to the terms and conditions of version 2 of
	7	* the GNU General Public License. See the file COPYING in the main
	8	* directory of this archive for more details.
	9	*
	10	* LED driver for various PCA955x I2C LED drivers
	11	*
	12	* Supported devices:
	13	*
	14	* Device Description 7-bit slave address
	15	* ------ ----------- -------------------
	16	* PCA9550 2-bit driver 0x60 .. 0x61
	17	* PCA9551 8-bit driver 0x60 .. 0x67
	18	* PCA9552 16-bit driver 0x60 .. 0x67
	19	* PCA9553/01 4-bit driver 0x62
	20	* PCA9553/02 4-bit driver 0x63
	21	*
	22	* Philips PCA955x LED driver chips follow a register map as shown below:
	23	*
	24	* Control Register Description
	25	* ---------------- -----------
	26	* 0x0 Input register 0
	27	* ..
	28	* NUM_INPUT_REGS - 1 Last Input register X
	29	*
	30	* NUM_INPUT_REGS Frequency prescaler 0
	31	* NUM_INPUT_REGS + 1 PWM register 0
	32	* NUM_INPUT_REGS + 2 Frequency prescaler 1
	33	* NUM_INPUT_REGS + 3 PWM register 1
	34	*
	35	* NUM_INPUT_REGS + 4 LED selector 0
	36	* NUM_INPUT_REGS + 4
	37	* + NUM_LED_REGS - 1 Last LED selector
	38	*
	39	* where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many
	40	* bits the chip supports.
	41	*/
	42
44b3e31d	43	#include <linux/acpi.h>
f46e9203 NC	44	#include <linux/module.h>
	45	#include <linux/delay.h>
	46	#include <linux/string.h>
	47	#include <linux/ctype.h>
	48	#include <linux/leds.h>
	49	#include <linux/err.h>
	50	#include <linux/i2c.h>
5a0e3ad6	51	#include <linux/slab.h>
f46e9203 NC	52
	53	/* LED select registers determine the source that drives LED outputs */
	54	#define PCA955X_LS_LED_ON 0x0 /* Output LOW */
	55	#define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */
	56	#define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */
	57	#define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */
	58
	59	enum pca955x_type {
	60	pca9550,
	61	pca9551,
	62	pca9552,
	63	pca9553,
	64	};
	65
	66	struct pca955x_chipdef {
	67	int bits;
	68	u8 slv_addr; /* 7-bit slave address mask */
	69	int slv_addr_shift; /* Number of bits to ignore */
	70	};
	71
	72	static struct pca955x_chipdef pca955x_chipdefs[] = {
	73	[pca9550] = {
	74	.bits = 2,
	75	.slv_addr = /* 110000x */ 0x60,
	76	.slv_addr_shift = 1,
	77	},
	78	[pca9551] = {
	79	.bits = 8,
	80	.slv_addr = /* 1100xxx */ 0x60,
	81	.slv_addr_shift = 3,
	82	},
	83	[pca9552] = {
	84	.bits = 16,
	85	.slv_addr = /* 1100xxx */ 0x60,
	86	.slv_addr_shift = 3,
	87	},
	88	[pca9553] = {
	89	.bits = 4,
	90	.slv_addr = /* 110001x */ 0x62,
	91	.slv_addr_shift = 1,
	92	},
	93	};
	94
	95	static const struct i2c_device_id pca955x_id[] = {
	96	{ "pca9550", pca9550 },
	97	{ "pca9551", pca9551 },
	98	{ "pca9552", pca9552 },
	99	{ "pca9553", pca9553 },
	100	{ }
	101	};
	102	MODULE_DEVICE_TABLE(i2c, pca955x_id);
	103
44b3e31d TH	104	static const struct acpi_device_id pca955x_acpi_ids[] = {
	105	{ "PCA9550", pca9550 },
	106	{ "PCA9551", pca9551 },
	107	{ "PCA9552", pca9552 },
	108	{ "PCA9553", pca9553 },
	109	{ }
	110	};
	111	MODULE_DEVICE_TABLE(acpi, pca955x_acpi_ids);
	112
e7e11d8b AS	113	struct pca955x {
	114	struct mutex lock;
	115	struct pca955x_led *leds;
f46e9203 NC	116	struct pca955x_chipdef *chipdef;
f46e9203 NC	117	struct i2c_client *client;
e7e11d8b AS	118	};
	119
	120	struct pca955x_led {
	121	struct pca955x *pca955x;
f46e9203 NC	122	struct led_classdev led_cdev;
	123	int led_num; /* 0 .. 15 potentially */
	124	char name[32];
	125	};
	126
	127	/* 8 bits per input register */
	128	static inline int pca95xx_num_input_regs(int bits)
	129	{
	130	return (bits + 7) / 8;
	131	}
	132
	133	/* 4 bits per LED selector register */
	134	static inline int pca95xx_num_led_regs(int bits)
	135	{
	136	return (bits + 3) / 4;
	137	}
	138
	139	/*
	140	* Return an LED selector register value based on an existing one, with
	141	* the appropriate 2-bit state value set for the given LED number (0-3).
	142	*/
	143	static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
	144	{
	145	return (oldval & (~(0x3 << (led_num << 1)))) \|
	146	((state & 0x3) << (led_num << 1));
	147	}
	148
	149	/*
	150	* Write to frequency prescaler register, used to program the
	151	* period of the PWM output. period = (PSCx + 1) / 38
	152	*/
	153	static void pca955x_write_psc(struct i2c_client *client, int n, u8 val)
	154	{
e7e11d8b	155	struct pca955x *pca955x = i2c_get_clientdata(client);
f46e9203 NC	156
	157	i2c_smbus_write_byte_data(client,
	158	pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n,
	159	val);
	160	}
	161
	162	/*
	163	* Write to PWM register, which determines the duty cycle of the
	164	* output. LED is OFF when the count is less than the value of this
	165	* register, and ON when it is greater. If PWMx == 0, LED is always OFF.
	166	*
	167	* Duty cycle is (256 - PWMx) / 256
	168	*/
	169	static void pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
	170	{
e7e11d8b	171	struct pca955x *pca955x = i2c_get_clientdata(client);
f46e9203 NC	172
	173	i2c_smbus_write_byte_data(client,
	174	pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n,
	175	val);
	176	}
	177
	178	/*
	179	* Write to LED selector register, which determines the source that
	180	* drives the LED output.
	181	*/
	182	static void pca955x_write_ls(struct i2c_client *client, int n, u8 val)
	183	{
e7e11d8b	184	struct pca955x *pca955x = i2c_get_clientdata(client);
f46e9203 NC	185
	186	i2c_smbus_write_byte_data(client,
	187	pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n,
	188	val);
	189	}
	190
	191	/*
	192	* Read the LED selector register, which determines the source that
	193	* drives the LED output.
	194	*/
	195	static u8 pca955x_read_ls(struct i2c_client *client, int n)
	196	{
e7e11d8b	197	struct pca955x *pca955x = i2c_get_clientdata(client);
f46e9203 NC	198
	199	return (u8) i2c_smbus_read_byte_data(client,
	200	pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n);
	201	}
	202
c3482b82 AL	203	static int pca955x_led_set(struct led_classdev *led_cdev,
c3482b82 AL	204	enum led_brightness value)
f46e9203	205	{
e7e11d8b AS	206	struct pca955x_led *pca955x_led;
e7e11d8b AS	207	struct pca955x *pca955x;
f46e9203 NC	208	u8 ls;
	209	int chip_ls; /* which LSx to use (0-3 potentially) */
	210	int ls_led; /* which set of bits within LSx to use (0-3) */
	211
c3482b82	212	pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
e7e11d8b AS	213	pca955x = pca955x_led->pca955x;
	214
	215	chip_ls = pca955x_led->led_num / 4;
	216	ls_led = pca955x_led->led_num % 4;
	217
	218	mutex_lock(&pca955x->lock);
f46e9203 NC	219
	220	ls = pca955x_read_ls(pca955x->client, chip_ls);
	221
c3482b82	222	switch (value) {
f46e9203 NC	223	case LED_FULL:
	224	ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
	225	break;
	226	case LED_OFF:
	227	ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
	228	break;
	229	case LED_HALF:
	230	ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
	231	break;
	232	default:
	233	/*
	234	* Use PWM1 for all other values. This has the unwanted
	235	* side effect of making all LEDs on the chip share the
	236	* same brightness level if set to a value other than
	237	* OFF, HALF, or FULL. But, this is probably better than
	238	* just turning off for all other values.
	239	*/
e7e11d8b	240	pca955x_write_pwm(pca955x->client, 1,
c3482b82	241	255 - value);
f46e9203 NC	242	ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
	243	break;
	244	}
	245
	246	pca955x_write_ls(pca955x->client, chip_ls, ls);
e7e11d8b AS	247
e7e11d8b AS	248	mutex_unlock(&pca955x->lock);
f46e9203	249
c3482b82	250	return 0;
f46e9203 NC	251	}
f46e9203 NC	252
98ea1ea2	253	static int pca955x_probe(struct i2c_client *client,
f46e9203 NC	254	const struct i2c_device_id *id)
f46e9203 NC	255	{
e7e11d8b AS	256	struct pca955x *pca955x;
e7e11d8b AS	257	struct pca955x_led *pca955x_led;
f46e9203 NC	258	struct pca955x_chipdef *chip;
	259	struct i2c_adapter *adapter;
	260	struct led_platform_data *pdata;
95bf14bf	261	int i, err;
f46e9203	262
44b3e31d TH	263	if (id) {
	264	chip = &pca955x_chipdefs[id->driver_data];
	265	} else {
	266	const struct acpi_device_id *acpi_id;
	267
	268	acpi_id = acpi_match_device(pca955x_acpi_ids, &client->dev);
	269	if (!acpi_id)
	270	return -ENODEV;
	271	chip = &pca955x_chipdefs[acpi_id->driver_data];
	272	}
f46e9203	273	adapter = to_i2c_adapter(client->dev.parent);
87aae1ea	274	pdata = dev_get_platdata(&client->dev);
f46e9203 NC	275
	276	/* Make sure the slave address / chip type combo given is possible */
	277	if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
	278	chip->slv_addr) {
	279	dev_err(&client->dev, "invalid slave address %02x\n",
	280	client->addr);
	281	return -ENODEV;
	282	}
	283
b40b0c17	284	dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at "
f46e9203	285	"slave address 0x%02x\n",
44b3e31d	286	client->name, chip->bits, client->addr);
f46e9203	287
aace34c0	288	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
f46e9203 NC	289	return -EIO;
	290
	291	if (pdata) {
	292	if (pdata->num_leds != chip->bits) {
	293	dev_err(&client->dev, "board info claims %d LEDs"
	294	" on a %d-bit chip\n",
	295	pdata->num_leds, chip->bits);
	296	return -ENODEV;
	297	}
	298	}
	299
73759f6a	300	pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL);
95bf14bf SW	301	if (!pca955x)
	302	return -ENOMEM;
	303
73759f6a BW	304	pca955x->leds = devm_kzalloc(&client->dev,
	305	sizeof(pca955x_led) chip->bits, GFP_KERNEL);
	306	if (!pca955x->leds)
	307	return -ENOMEM;
e7e11d8b	308
95bf14bf SW	309	i2c_set_clientdata(client, pca955x);
95bf14bf SW	310
e7e11d8b AS	311	mutex_init(&pca955x->lock);
	312	pca955x->client = client;
	313	pca955x->chipdef = chip;
	314
f46e9203	315	for (i = 0; i < chip->bits; i++) {
e7e11d8b AS	316	pca955x_led = &pca955x->leds[i];
	317	pca955x_led->led_num = i;
	318	pca955x_led->pca955x = pca955x;
f46e9203	319
f46e9203 NC	320	/* Platform data can specify LED names and default triggers */
	321	if (pdata) {
	322	if (pdata->leds[i].name)
e7e11d8b AS	323	snprintf(pca955x_led->name,
	324	sizeof(pca955x_led->name), "pca955x:%s",
	325	pdata->leds[i].name);
f46e9203	326	if (pdata->leds[i].default_trigger)
e7e11d8b	327	pca955x_led->led_cdev.default_trigger =
f46e9203 NC	328	pdata->leds[i].default_trigger;
f46e9203 NC	329	} else {
e7e11d8b	330	snprintf(pca955x_led->name, sizeof(pca955x_led->name),
95bf14bf	331	"pca955x:%d", i);
f46e9203	332	}
f46e9203	333
e7e11d8b	334	pca955x_led->led_cdev.name = pca955x_led->name;
c3482b82	335	pca955x_led->led_cdev.brightness_set_blocking = pca955x_led_set;
f46e9203	336
e7e11d8b AS	337	err = led_classdev_register(&client->dev,
e7e11d8b AS	338	&pca955x_led->led_cdev);
95bf14bf SW	339	if (err < 0)
95bf14bf SW	340	goto exit;
f46e9203 NC	341	}
	342
	343	/* Turn off LEDs */
	344	for (i = 0; i < pca95xx_num_led_regs(chip->bits); i++)
	345	pca955x_write_ls(client, i, 0x55);
	346
	347	/* PWM0 is used for half brightness or 50% duty cycle */
	348	pca955x_write_pwm(client, 0, 255-LED_HALF);
	349
	350	/* PWM1 is used for variable brightness, default to OFF */
	351	pca955x_write_pwm(client, 1, 0);
	352
	353	/* Set to fast frequency so we do not see flashing */
	354	pca955x_write_psc(client, 0, 0);
	355	pca955x_write_psc(client, 1, 0);
	356
	357	return 0;
95bf14bf	358
f46e9203	359	exit:
c3482b82	360	while (i--)
e7e11d8b	361	led_classdev_unregister(&pca955x->leds[i].led_cdev);
95bf14bf	362
f46e9203 NC	363	return err;
	364	}
	365
678e8a6b	366	static int pca955x_remove(struct i2c_client *client)
f46e9203	367	{
e7e11d8b	368	struct pca955x *pca955x = i2c_get_clientdata(client);
f46e9203 NC	369	int i;
f46e9203 NC	370
c3482b82	371	for (i = 0; i < pca955x->chipdef->bits; i++)
e7e11d8b	372	led_classdev_unregister(&pca955x->leds[i].led_cdev);
f46e9203 NC	373
	374	return 0;
	375	}
	376
	377	static struct i2c_driver pca955x_driver = {
	378	.driver = {
	379	.name = "leds-pca955x",
44b3e31d	380	.acpi_match_table = ACPI_PTR(pca955x_acpi_ids),
f46e9203 NC	381	},
f46e9203 NC	382	.probe = pca955x_probe,
df07cf81	383	.remove = pca955x_remove,
f46e9203 NC	384	.id_table = pca955x_id,
	385	};
	386
09a0d183	387	module_i2c_driver(pca955x_driver);
f46e9203 NC	388
	389	MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
	390	MODULE_DESCRIPTION("PCA955x LED driver");
	391	MODULE_LICENSE("GPL v2");