[linux-2.6-block.git] / drivers / leds / leds-pca9532.c

/*
 * pca9532.c - 16-bit Led dimmer
 *
 * Copyright (C) 2011 Jan Weitzel
 * Copyright (C) 2008 Riku Voipio
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf
 *
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/input.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/leds-pca9532.h>
#include <linux/gpio.h>

/* m =  num_leds*/
#define PCA9532_REG_INPUT(i)	((i) >> 3)
#define PCA9532_REG_OFFSET(m)	((m) >> 4)
#define PCA9532_REG_PSC(m, i)	(PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
#define PCA9532_REG_PWM(m, i)	(PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
#define LED_REG(m, led)		(PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
#define LED_NUM(led)		(led & 0x3)

#define ldev_to_led(c)       container_of(c, struct pca9532_led, ldev)

struct pca9532_chip_info {
	u8	num_leds;
};

struct pca9532_data {
	struct i2c_client *client;
	struct pca9532_led leds[16];
	struct mutex update_lock;
	struct input_dev *idev;
	struct work_struct work;
#ifdef CONFIG_LEDS_PCA9532_GPIO
	struct gpio_chip gpio;
#endif
	const struct pca9532_chip_info *chip_info;
	u8 pwm[2];
	u8 psc[2];
};

static int pca9532_probe(struct i2c_client *client,
	const struct i2c_device_id *id);
static int pca9532_remove(struct i2c_client *client);

enum {
	pca9530,
	pca9531,
	pca9532,
	pca9533,
};

static const struct i2c_device_id pca9532_id[] = {
	{ "pca9530", pca9530 },
	{ "pca9531", pca9531 },
	{ "pca9532", pca9532 },
	{ "pca9533", pca9533 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, pca9532_id);

static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
	[pca9530] = {
		.num_leds = 2,
	},
	[pca9531] = {
		.num_leds = 8,
	},
	[pca9532] = {
		.num_leds = 16,
	},
	[pca9533] = {
		.num_leds = 4,
	},
};

static struct i2c_driver pca9532_driver = {
	.driver = {
		.name = "leds-pca953x",
	},
	.probe = pca9532_probe,
	.remove = pca9532_remove,
	.id_table = pca9532_id,
};

/* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
 * the clever Thecus people are using one pwm to drive the beeper. So,
 * as a compromise we average one pwm to the values requested by all
 * leds that are not ON/OFF.
 * */
static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
	enum led_brightness value)
{
	int a = 0, b = 0, i = 0;
	struct pca9532_data *data = i2c_get_clientdata(client);
	for (i = 0; i < data->chip_info->num_leds; i++) {
		if (data->leds[i].type == PCA9532_TYPE_LED &&
			data->leds[i].state == PCA9532_PWM0+pwm) {
				a++;
				b += data->leds[i].ldev.brightness;
		}
	}
	if (a == 0) {
		dev_err(&client->dev,
		"fear of division by zero %d/%d, wanted %d\n",
			b, a, value);
		return -EINVAL;
	}
	b = b/a;
	if (b > 0xFF)
		return -EINVAL;
	data->pwm[pwm] = b;
	data->psc[pwm] = blink;
	return 0;
}

static int pca9532_setpwm(struct i2c_client *client, int pwm)
{
	struct pca9532_data *data = i2c_get_clientdata(client);
	u8 maxleds = data->chip_info->num_leds;

	mutex_lock(&data->update_lock);
	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
		data->pwm[pwm]);
	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
		data->psc[pwm]);
	mutex_unlock(&data->update_lock);
	return 0;
}

/* Set LED routing */
static void pca9532_setled(struct pca9532_led *led)
{
	struct i2c_client *client = led->client;
	struct pca9532_data *data = i2c_get_clientdata(client);
	u8 maxleds = data->chip_info->num_leds;
	char reg;

	mutex_lock(&data->update_lock);
	reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
	/* zero led bits */
	reg = reg & ~(0x3<<LED_NUM(led->id)*2);
	/* set the new value */
	reg = reg | (led->state << LED_NUM(led->id)*2);
	i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
	mutex_unlock(&data->update_lock);
}

static int pca9532_set_brightness(struct led_classdev *led_cdev,
	enum led_brightness value)
{
	int err = 0;
	struct pca9532_led *led = ldev_to_led(led_cdev);

	if (value == LED_OFF)
		led->state = PCA9532_OFF;
	else if (value == LED_FULL)
		led->state = PCA9532_ON;
	else {
		led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
		err = pca9532_calcpwm(led->client, 0, 0, value);
		if (err)
			return err;
	}
	if (led->state == PCA9532_PWM0)
		pca9532_setpwm(led->client, 0);
	pca9532_setled(led);
	return err;
}

static int pca9532_set_blink(struct led_classdev *led_cdev,
	unsigned long *delay_on, unsigned long *delay_off)
{
	struct pca9532_led *led = ldev_to_led(led_cdev);
	struct i2c_client *client = led->client;
	int psc;
	int err = 0;

	if (*delay_on == 0 && *delay_off == 0) {
		/* led subsystem ask us for a blink rate */
		*delay_on = 1000;
		*delay_off = 1000;
	}
	if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
		return -EINVAL;

	/* Thecus specific: only use PSC/PWM 0 */
	psc = (*delay_on * 152-1)/1000;
	err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
	if (err)
		return err;
	if (led->state == PCA9532_PWM0)
		pca9532_setpwm(led->client, 0);
	pca9532_setled(led);

	return 0;
}

static int pca9532_event(struct input_dev *dev, unsigned int type,
	unsigned int code, int value)
{
	struct pca9532_data *data = input_get_drvdata(dev);

	if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE)))
		return -1;

	/* XXX: allow different kind of beeps with psc/pwm modifications */
	if (value > 1 && value < 32767)
		data->pwm[1] = 127;
	else
		data->pwm[1] = 0;

	schedule_work(&data->work);

	return 0;
}

static void pca9532_input_work(struct work_struct *work)
{
	struct pca9532_data *data =
		container_of(work, struct pca9532_data, work);
	u8 maxleds = data->chip_info->num_leds;

	mutex_lock(&data->update_lock);
	i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
		data->pwm[1]);
	mutex_unlock(&data->update_lock);
}

#ifdef CONFIG_LEDS_PCA9532_GPIO
static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
{
	struct pca9532_data *data = gpiochip_get_data(gc);
	struct pca9532_led *led = &data->leds[offset];

	if (led->type == PCA9532_TYPE_GPIO)
		return 0;

	return -EBUSY;
}

static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
{
	struct pca9532_data *data = gpiochip_get_data(gc);
	struct pca9532_led *led = &data->leds[offset];

	if (val)
		led->state = PCA9532_ON;
	else
		led->state = PCA9532_OFF;

	pca9532_setled(led);
}

static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
{
	struct pca9532_data *data = gpiochip_get_data(gc);
	unsigned char reg;

	reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));

	return !!(reg & (1 << (offset % 8)));
}

static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
	/* To use as input ensure pin is not driven */
	pca9532_gpio_set_value(gc, offset, 0);

	return 0;
}

static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
{
	pca9532_gpio_set_value(gc, offset, val);

	return 0;
}
#endif /* CONFIG_LEDS_PCA9532_GPIO */

static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
{
	int i = n_devs;

	if (!data)
		return -EINVAL;

	while (--i >= 0) {
		switch (data->leds[i].type) {
		case PCA9532_TYPE_NONE:
		case PCA9532_TYPE_GPIO:
			break;
		case PCA9532_TYPE_LED:
			led_classdev_unregister(&data->leds[i].ldev);
			break;
		case PCA9532_TYPE_N2100_BEEP:
			if (data->idev != NULL) {
				cancel_work_sync(&data->work);
				data->idev = NULL;
			}
			break;
		}
	}

#ifdef CONFIG_LEDS_PCA9532_GPIO
	if (data->gpio.parent)
		gpiochip_remove(&data->gpio);
#endif

	return 0;
}

static int pca9532_configure(struct i2c_client *client,
	struct pca9532_data *data, struct pca9532_platform_data *pdata)
{
	int i, err = 0;
	int gpios = 0;
	u8 maxleds = data->chip_info->num_leds;

	for (i = 0; i < 2; i++)	{
		data->pwm[i] = pdata->pwm[i];
		data->psc[i] = pdata->psc[i];
		i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
			data->pwm[i]);
		i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
			data->psc[i]);
	}

	for (i = 0; i < data->chip_info->num_leds; i++) {
		struct pca9532_led *led = &data->leds[i];
		struct pca9532_led *pled = &pdata->leds[i];
		led->client = client;
		led->id = i;
		led->type = pled->type;
		switch (led->type) {
		case PCA9532_TYPE_NONE:
			break;
		case PCA9532_TYPE_GPIO:
			gpios++;
			break;
		case PCA9532_TYPE_LED:
			led->state = pled->state;
			led->name = pled->name;
			led->ldev.name = led->name;
			led->ldev.brightness = LED_OFF;
			led->ldev.brightness_set_blocking =
						pca9532_set_brightness;
			led->ldev.blink_set = pca9532_set_blink;
			err = led_classdev_register(&client->dev, &led->ldev);
			if (err < 0) {
				dev_err(&client->dev,
					"couldn't register LED %s\n",
					led->name);
				goto exit;
			}
			pca9532_setled(led);
			break;
		case PCA9532_TYPE_N2100_BEEP:
			BUG_ON(data->idev);
			led->state = PCA9532_PWM1;
			pca9532_setled(led);
			data->idev = devm_input_allocate_device(&client->dev);
			if (data->idev == NULL) {
				err = -ENOMEM;
				goto exit;
			}
			data->idev->name = pled->name;
			data->idev->phys = "i2c/pca9532";
			data->idev->id.bustype = BUS_HOST;
			data->idev->id.vendor = 0x001f;
			data->idev->id.product = 0x0001;
			data->idev->id.version = 0x0100;
			data->idev->evbit[0] = BIT_MASK(EV_SND);
			data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
						BIT_MASK(SND_TONE);
			data->idev->event = pca9532_event;
			input_set_drvdata(data->idev, data);
			INIT_WORK(&data->work, pca9532_input_work);
			err = input_register_device(data->idev);
			if (err) {
				cancel_work_sync(&data->work);
				data->idev = NULL;
				goto exit;
			}
			break;
		}
	}

#ifdef CONFIG_LEDS_PCA9532_GPIO
	if (gpios) {
		data->gpio.label = "gpio-pca9532";
		data->gpio.direction_input = pca9532_gpio_direction_input;
		data->gpio.direction_output = pca9532_gpio_direction_output;
		data->gpio.set = pca9532_gpio_set_value;
		data->gpio.get = pca9532_gpio_get_value;
		data->gpio.request = pca9532_gpio_request_pin;
		data->gpio.can_sleep = 1;
		data->gpio.base = pdata->gpio_base;
		data->gpio.ngpio = data->chip_info->num_leds;
		data->gpio.parent = &client->dev;
		data->gpio.owner = THIS_MODULE;

		err = gpiochip_add_data(&data->gpio, data);
		if (err) {
			/* Use data->gpio.dev as a flag for freeing gpiochip */
			data->gpio.parent = NULL;
			dev_warn(&client->dev, "could not add gpiochip\n");
		} else {
			dev_info(&client->dev, "gpios %i...%i\n",
				data->gpio.base, data->gpio.base +
				data->gpio.ngpio - 1);
		}
	}
#endif

	return 0;

exit:
	pca9532_destroy_devices(data, i);
	return err;
}

static int pca9532_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
{
	struct pca9532_data *data = i2c_get_clientdata(client);
	struct pca9532_platform_data *pca9532_pdata =
			dev_get_platdata(&client->dev);

	if (!pca9532_pdata)
		return -EIO;

	if (!i2c_check_functionality(client->adapter,
		I2C_FUNC_SMBUS_BYTE_DATA))
		return -EIO;

	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->chip_info = &pca9532_chip_info_tbl[id->driver_data];

	dev_info(&client->dev, "setting platform data\n");
	i2c_set_clientdata(client, data);
	data->client = client;
	mutex_init(&data->update_lock);

	return pca9532_configure(client, data, pca9532_pdata);
}

static int pca9532_remove(struct i2c_client *client)
{
	struct pca9532_data *data = i2c_get_clientdata(client);
	int err;

	err = pca9532_destroy_devices(data, data->chip_info->num_leds);
	if (err)
		return err;

	return 0;
}

module_i2c_driver(pca9532_driver);

MODULE_AUTHOR("Riku Voipio");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PCA 9532 LED dimmer");
Commit	Line	Data
e14fa824 RV	1	/*
	2	* pca9532.c - 16-bit Led dimmer
	3	*
3dbf622c	4	* Copyright (C) 2011 Jan Weitzel
b26e0ed4	5	* Copyright (C) 2008 Riku Voipio
e14fa824 RV	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; version 2 of the License.
	10	*
3dbf622c	11	* Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf
e14fa824 RV	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/i2c.h>
5a0e3ad6	17	#include <linux/slab.h>
e14fa824 RV	18	#include <linux/leds.h>
	19	#include <linux/input.h>
	20	#include <linux/mutex.h>
934cd3f9	21	#include <linux/workqueue.h>
e14fa824	22	#include <linux/leds-pca9532.h>
3c1ab50d	23	#include <linux/gpio.h>
e14fa824	24
3dbf622c JW	25	/* m = num_leds*/
	26	#define PCA9532_REG_INPUT(i) ((i) >> 3)
	27	#define PCA9532_REG_OFFSET(m) ((m) >> 4)
	28	#define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
	29	#define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
	30	#define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
	31	#define LED_NUM(led) (led & 0x3)
e14fa824 RV	32
	33	#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
	34
3dbf622c JW	35	struct pca9532_chip_info {
	36	u8 num_leds;
	37	};
	38
e14fa824 RV	39	struct pca9532_data {
	40	struct i2c_client *client;
	41	struct pca9532_led leds[16];
	42	struct mutex update_lock;
85c5204a	43	struct input_dev *idev;
07172d2b	44	struct work_struct work;
3c1ab50d JE	45	#ifdef CONFIG_LEDS_PCA9532_GPIO
	46	struct gpio_chip gpio;
	47	#endif
3dbf622c	48	const struct pca9532_chip_info *chip_info;
e14fa824 RV	49	u8 pwm[2];
	50	u8 psc[2];
	51	};
	52
	53	static int pca9532_probe(struct i2c_client *client,
	54	const struct i2c_device_id *id);
	55	static int pca9532_remove(struct i2c_client *client);
	56
3dbf622c JW	57	enum {
	58	pca9530,
	59	pca9531,
	60	pca9532,
	61	pca9533,
	62	};
	63
e14fa824	64	static const struct i2c_device_id pca9532_id[] = {
3dbf622c JW	65	{ "pca9530", pca9530 },
	66	{ "pca9531", pca9531 },
	67	{ "pca9532", pca9532 },
	68	{ "pca9533", pca9533 },
e14fa824 RV	69	{ }
	70	};
	71
	72	MODULE_DEVICE_TABLE(i2c, pca9532_id);
	73
3dbf622c JW	74	static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
	75	[pca9530] = {
	76	.num_leds = 2,
	77	},
	78	[pca9531] = {
	79	.num_leds = 8,
	80	},
	81	[pca9532] = {
	82	.num_leds = 16,
	83	},
	84	[pca9533] = {
	85	.num_leds = 4,
	86	},
	87	};
	88
e14fa824 RV	89	static struct i2c_driver pca9532_driver = {
e14fa824 RV	90	.driver = {
30cb35be	91	.name = "leds-pca953x",
e14fa824	92	},
85c5204a	93	.probe = pca9532_probe,
e14fa824 RV	94	.remove = pca9532_remove,
	95	.id_table = pca9532_id,
	96	};
	97
25985edc	98	/* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
e14fa824 RV	99	* the clever Thecus people are using one pwm to drive the beeper. So,
	100	* as a compromise we average one pwm to the values requested by all
	101	* leds that are not ON/OFF.
	102	* */
934cd3f9	103	static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
e14fa824 RV	104	enum led_brightness value)
	105	{
	106	int a = 0, b = 0, i = 0;
	107	struct pca9532_data *data = i2c_get_clientdata(client);
3dbf622c	108	for (i = 0; i < data->chip_info->num_leds; i++) {
e14fa824 RV	109	if (data->leds[i].type == PCA9532_TYPE_LED &&
	110	data->leds[i].state == PCA9532_PWM0+pwm) {
	111	a++;
	112	b += data->leds[i].ldev.brightness;
	113	}
	114	}
	115	if (a == 0) {
	116	dev_err(&client->dev,
	117	"fear of division by zero %d/%d, wanted %d\n",
	118	b, a, value);
	119	return -EINVAL;
	120	}
	121	b = b/a;
	122	if (b > 0xFF)
	123	return -EINVAL;
e14fa824	124	data->pwm[pwm] = b;
07172d2b AO	125	data->psc[pwm] = blink;
07172d2b AO	126	return 0;
934cd3f9 RV	127	}
	128
	129	static int pca9532_setpwm(struct i2c_client *client, int pwm)
	130	{
07172d2b	131	struct pca9532_data *data = i2c_get_clientdata(client);
3dbf622c JW	132	u8 maxleds = data->chip_info->num_leds;
3dbf622c JW	133
07172d2b	134	mutex_lock(&data->update_lock);
3dbf622c	135	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
e14fa824	136	data->pwm[pwm]);
3dbf622c	137	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
e14fa824 RV	138	data->psc[pwm]);
	139	mutex_unlock(&data->update_lock);
	140	return 0;
	141	}
	142
	143	/* Set LED routing */
	144	static void pca9532_setled(struct pca9532_led *led)
	145	{
	146	struct i2c_client *client = led->client;
	147	struct pca9532_data *data = i2c_get_clientdata(client);
3dbf622c	148	u8 maxleds = data->chip_info->num_leds;
e14fa824 RV	149	char reg;
	150
	151	mutex_lock(&data->update_lock);
3dbf622c	152	reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
e14fa824 RV	153	/* zero led bits */
	154	reg = reg & ~(0x3<<LED_NUM(led->id)*2);
	155	/* set the new value */
	156	reg = reg \| (led->state << LED_NUM(led->id)*2);
3dbf622c	157	i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
e14fa824 RV	158	mutex_unlock(&data->update_lock);
	159	}
	160
00a88a19	161	static int pca9532_set_brightness(struct led_classdev *led_cdev,
e14fa824 RV	162	enum led_brightness value)
	163	{
	164	int err = 0;
	165	struct pca9532_led *led = ldev_to_led(led_cdev);
	166
	167	if (value == LED_OFF)
	168	led->state = PCA9532_OFF;
	169	else if (value == LED_FULL)
	170	led->state = PCA9532_ON;
	171	else {
	172	led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
07172d2b	173	err = pca9532_calcpwm(led->client, 0, 0, value);
e14fa824	174	if (err)
00a88a19	175	return err;
e14fa824	176	}
00a88a19 AL	177	if (led->state == PCA9532_PWM0)
	178	pca9532_setpwm(led->client, 0);
	179	pca9532_setled(led);
	180	return err;
e14fa824 RV	181	}
	182
	183	static int pca9532_set_blink(struct led_classdev *led_cdev,
	184	unsigned long delay_on, unsigned long delay_off)
	185	{
	186	struct pca9532_led *led = ldev_to_led(led_cdev);
	187	struct i2c_client *client = led->client;
	188	int psc;
07172d2b	189	int err = 0;
e14fa824 RV	190
e14fa824 RV	191	if (delay_on == 0 && delay_off == 0) {
962363ce	192	/* led subsystem ask us for a blink rate */
85c5204a	193	*delay_on = 1000;
e14fa824 RV	194	*delay_off = 1000;
	195	}
	196	if (delay_on != delay_off \|\| delay_on > 1690 \|\| delay_on < 6)
	197	return -EINVAL;
	198
	199	/* Thecus specific: only use PSC/PWM 0 */
	200	psc = (delay_on 152-1)/1000;
07172d2b AO	201	err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
	202	if (err)
	203	return err;
00a88a19 AL	204	if (led->state == PCA9532_PWM0)
	205	pca9532_setpwm(led->client, 0);
	206	pca9532_setled(led);
	207
07172d2b	208	return 0;
e14fa824 RV	209	}
e14fa824 RV	210
0d733579 SW	211	static int pca9532_event(struct input_dev *dev, unsigned int type,
0d733579 SW	212	unsigned int code, int value)
e14fa824 RV	213	{
	214	struct pca9532_data *data = input_get_drvdata(dev);
	215
7fbc3a9b	216	if (!(type == EV_SND && (code == SND_BELL \|\| code == SND_TONE)))
e14fa824 RV	217	return -1;
	218
	219	/* XXX: allow different kind of beeps with psc/pwm modifications */
	220	if (value > 1 && value < 32767)
	221	data->pwm[1] = 127;
	222	else
	223	data->pwm[1] = 0;
	224
07172d2b	225	schedule_work(&data->work);
934cd3f9	226
07172d2b	227	return 0;
934cd3f9 RV	228	}
	229
	230	static void pca9532_input_work(struct work_struct *work)
	231	{
3dbf622c JW	232	struct pca9532_data *data =
	233	container_of(work, struct pca9532_data, work);
	234	u8 maxleds = data->chip_info->num_leds;
	235
e14fa824	236	mutex_lock(&data->update_lock);
3dbf622c	237	i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
e14fa824 RV	238	data->pwm[1]);
e14fa824 RV	239	mutex_unlock(&data->update_lock);
934cd3f9	240	}
e14fa824	241
3c1ab50d JE	242	#ifdef CONFIG_LEDS_PCA9532_GPIO
	243	static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
	244	{
dced1467	245	struct pca9532_data *data = gpiochip_get_data(gc);
3c1ab50d JE	246	struct pca9532_led *led = &data->leds[offset];
	247
	248	if (led->type == PCA9532_TYPE_GPIO)
	249	return 0;
	250
	251	return -EBUSY;
	252	}
	253
	254	static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
	255	{
dced1467	256	struct pca9532_data *data = gpiochip_get_data(gc);
3c1ab50d JE	257	struct pca9532_led *led = &data->leds[offset];
	258
	259	if (val)
	260	led->state = PCA9532_ON;
	261	else
	262	led->state = PCA9532_OFF;
	263
	264	pca9532_setled(led);
	265	}
	266
	267	static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
	268	{
dced1467	269	struct pca9532_data *data = gpiochip_get_data(gc);
3c1ab50d JE	270	unsigned char reg;
	271
	272	reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
	273
	274	return !!(reg & (1 << (offset % 8)));
	275	}
	276
	277	static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
	278	{
	279	/* To use as input ensure pin is not driven */
	280	pca9532_gpio_set_value(gc, offset, 0);
	281
	282	return 0;
	283	}
	284
	285	static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
	286	{
	287	pca9532_gpio_set_value(gc, offset, val);
	288
	289	return 0;
	290	}
	291	#endif /* CONFIG_LEDS_PCA9532_GPIO */
	292
	293	static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
125c7135 AL	294	{
	295	int i = n_devs;
	296
	297	if (!data)
3c1ab50d	298	return -EINVAL;
125c7135 AL	299
	300	while (--i >= 0) {
	301	switch (data->leds[i].type) {
	302	case PCA9532_TYPE_NONE:
3c1ab50d	303	case PCA9532_TYPE_GPIO:
125c7135 AL	304	break;
	305	case PCA9532_TYPE_LED:
	306	led_classdev_unregister(&data->leds[i].ldev);
125c7135 AL	307	break;
	308	case PCA9532_TYPE_N2100_BEEP:
	309	if (data->idev != NULL) {
125c7135 AL	310	cancel_work_sync(&data->work);
	311	data->idev = NULL;
	312	}
	313	break;
	314	}
	315	}
3c1ab50d JE	316
3c1ab50d JE	317	#ifdef CONFIG_LEDS_PCA9532_GPIO
58383c78	318	if (data->gpio.parent)
88d5e520	319	gpiochip_remove(&data->gpio);
3c1ab50d JE	320	#endif
	321
	322	return 0;
125c7135 AL	323	}
125c7135 AL	324
e14fa824 RV	325	static int pca9532_configure(struct i2c_client *client,
	326	struct pca9532_data data, struct pca9532_platform_data pdata)
	327	{
	328	int i, err = 0;
3c1ab50d	329	int gpios = 0;
3dbf622c	330	u8 maxleds = data->chip_info->num_leds;
e14fa824 RV	331
	332	for (i = 0; i < 2; i++) {
	333	data->pwm[i] = pdata->pwm[i];
	334	data->psc[i] = pdata->psc[i];
3dbf622c	335	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
e14fa824	336	data->pwm[i]);
3dbf622c	337	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
e14fa824 RV	338	data->psc[i]);
	339	}
	340
3dbf622c	341	for (i = 0; i < data->chip_info->num_leds; i++) {
e14fa824 RV	342	struct pca9532_led *led = &data->leds[i];
	343	struct pca9532_led *pled = &pdata->leds[i];
	344	led->client = client;
	345	led->id = i;
	346	led->type = pled->type;
	347	switch (led->type) {
	348	case PCA9532_TYPE_NONE:
	349	break;
3c1ab50d JE	350	case PCA9532_TYPE_GPIO:
	351	gpios++;
	352	break;
e14fa824 RV	353	case PCA9532_TYPE_LED:
e14fa824 RV	354	led->state = pled->state;
85c5204a	355	led->name = pled->name;
e14fa824 RV	356	led->ldev.name = led->name;
e14fa824 RV	357	led->ldev.brightness = LED_OFF;
00a88a19 AL	358	led->ldev.brightness_set_blocking =
00a88a19 AL	359	pca9532_set_brightness;
e14fa824	360	led->ldev.blink_set = pca9532_set_blink;
f785d022 SW	361	err = led_classdev_register(&client->dev, &led->ldev);
f785d022 SW	362	if (err < 0) {
e14fa824 RV	363	dev_err(&client->dev,
	364	"couldn't register LED %s\n",
	365	led->name);
	366	goto exit;
	367	}
	368	pca9532_setled(led);
	369	break;
	370	case PCA9532_TYPE_N2100_BEEP:
	371	BUG_ON(data->idev);
	372	led->state = PCA9532_PWM1;
	373	pca9532_setled(led);
8614fb46	374	data->idev = devm_input_allocate_device(&client->dev);
e14fa824 RV	375	if (data->idev == NULL) {
	376	err = -ENOMEM;
	377	goto exit;
	378	}
	379	data->idev->name = pled->name;
	380	data->idev->phys = "i2c/pca9532";
	381	data->idev->id.bustype = BUS_HOST;
85c5204a	382	data->idev->id.vendor = 0x001f;
e14fa824 RV	383	data->idev->id.product = 0x0001;
	384	data->idev->id.version = 0x0100;
	385	data->idev->evbit[0] = BIT_MASK(EV_SND);
	386	data->idev->sndbit[0] = BIT_MASK(SND_BELL) \|
	387	BIT_MASK(SND_TONE);
	388	data->idev->event = pca9532_event;
	389	input_set_drvdata(data->idev, data);
07172d2b	390	INIT_WORK(&data->work, pca9532_input_work);
e14fa824 RV	391	err = input_register_device(data->idev);
e14fa824 RV	392	if (err) {
07172d2b	393	cancel_work_sync(&data->work);
e14fa824 RV	394	data->idev = NULL;
	395	goto exit;
	396	}
	397	break;
	398	}
	399	}
3c1ab50d JE	400
	401	#ifdef CONFIG_LEDS_PCA9532_GPIO
	402	if (gpios) {
	403	data->gpio.label = "gpio-pca9532";
	404	data->gpio.direction_input = pca9532_gpio_direction_input;
	405	data->gpio.direction_output = pca9532_gpio_direction_output;
	406	data->gpio.set = pca9532_gpio_set_value;
	407	data->gpio.get = pca9532_gpio_get_value;
	408	data->gpio.request = pca9532_gpio_request_pin;
	409	data->gpio.can_sleep = 1;
	410	data->gpio.base = pdata->gpio_base;
3dbf622c	411	data->gpio.ngpio = data->chip_info->num_leds;
58383c78	412	data->gpio.parent = &client->dev;
3c1ab50d JE	413	data->gpio.owner = THIS_MODULE;
3c1ab50d JE	414
dced1467	415	err = gpiochip_add_data(&data->gpio, data);
3c1ab50d JE	416	if (err) {
3c1ab50d JE	417	/* Use data->gpio.dev as a flag for freeing gpiochip */
58383c78	418	data->gpio.parent = NULL;
3c1ab50d JE	419	dev_warn(&client->dev, "could not add gpiochip\n");
	420	} else {
	421	dev_info(&client->dev, "gpios %i...%i\n",
	422	data->gpio.base, data->gpio.base +
	423	data->gpio.ngpio - 1);
	424	}
	425	}
	426	#endif
	427
e14fa824 RV	428	return 0;
	429
	430	exit:
125c7135	431	pca9532_destroy_devices(data, i);
e14fa824	432	return err;
e14fa824 RV	433	}
	434
	435	static int pca9532_probe(struct i2c_client *client,
	436	const struct i2c_device_id *id)
	437	{
	438	struct pca9532_data *data = i2c_get_clientdata(client);
87aae1ea JH	439	struct pca9532_platform_data *pca9532_pdata =
87aae1ea JH	440	dev_get_platdata(&client->dev);
f785d022 SW	441
	442	if (!pca9532_pdata)
	443	return -EIO;
e14fa824 RV	444
	445	if (!i2c_check_functionality(client->adapter,
	446	I2C_FUNC_SMBUS_BYTE_DATA))
	447	return -EIO;
	448
0f4630c9	449	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
e14fa824 RV	450	if (!data)
	451	return -ENOMEM;
	452
3dbf622c JW	453	data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
3dbf622c JW	454
e14fa824 RV	455	dev_info(&client->dev, "setting platform data\n");
	456	i2c_set_clientdata(client, data);
	457	data->client = client;
	458	mutex_init(&data->update_lock);
	459
0f4630c9	460	return pca9532_configure(client, data, pca9532_pdata);
e14fa824 RV	461	}
	462
	463	static int pca9532_remove(struct i2c_client *client)
	464	{
	465	struct pca9532_data *data = i2c_get_clientdata(client);
3c1ab50d JE	466	int err;
3c1ab50d JE	467
3dbf622c	468	err = pca9532_destroy_devices(data, data->chip_info->num_leds);
3c1ab50d JE	469	if (err)
	470	return err;
	471
e14fa824 RV	472	return 0;
	473	}
	474
09a0d183	475	module_i2c_driver(pca9532_driver);
e14fa824	476
b26e0ed4	477	MODULE_AUTHOR("Riku Voipio");
e14fa824 RV	478	MODULE_LICENSE("GPL");
e14fa824 RV	479	MODULE_DESCRIPTION("PCA 9532 LED dimmer");