[mirror_ubuntu-artful-kernel.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>
#include <linux/of.h>
#include <linux/of_device.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,
	},
};

#ifdef CONFIG_OF
static const struct of_device_id of_pca9532_leds_match[] = {
	{ .compatible = "nxp,pca9530", .data = (void *)pca9530 },
	{ .compatible = "nxp,pca9531", .data = (void *)pca9531 },
	{ .compatible = "nxp,pca9532", .data = (void *)pca9532 },
	{ .compatible = "nxp,pca9533", .data = (void *)pca9533 },
	{},
};

MODULE_DEVICE_TABLE(of, of_pca9532_leds_match);
#endif

static struct i2c_driver pca9532_driver = {
	.driver = {
		.name = "leds-pca953x",
		.of_match_table = of_match_ptr(of_pca9532_leds_match),
	},
	.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.default_trigger = pled->default_trigger;
			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 struct pca9532_platform_data *
pca9532_of_populate_pdata(struct device *dev, struct device_node *np)
{
	struct pca9532_platform_data *pdata;
	struct device_node *child;
	const struct of_device_id *match;
	int devid, maxleds;
	int i = 0;

	match = of_match_device(of_pca9532_leds_match, dev);
	if (!match)
		return ERR_PTR(-ENODEV);

	devid = (int)(uintptr_t)match->data;
	maxleds = pca9532_chip_info_tbl[devid].num_leds;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	for_each_child_of_node(np, child) {
		if (of_property_read_string(child, "label",
					    &pdata->leds[i].name))
			pdata->leds[i].name = child->name;
		of_property_read_u32(child, "type", &pdata->leds[i].type);
		of_property_read_string(child, "linux,default-trigger",
					&pdata->leds[i].default_trigger);
		if (++i >= maxleds) {
			of_node_put(child);
			break;
		}
	}

	return pdata;
}

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

	if (!pca9532_pdata) {
		if (np) {
			pca9532_pdata =
				pca9532_of_populate_pdata(&client->dev, np);
			if (IS_ERR(pca9532_pdata))
				return PTR_ERR(pca9532_pdata);
		} else {
			dev_err(&client->dev, "no platform data\n");
			return -EINVAL;
		}
		devid = (int)(uintptr_t)of_match_device(
			of_pca9532_leds_match, &client->dev)->data;
	} else {
		devid = id->driver_data;
	}

	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[devid];

	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>
fa4191a6 PR	24	#include <linux/of.h>
fa4191a6 PR	25	#include <linux/of_device.h>
e14fa824	26
3dbf622c JW	27	/* m = num_leds*/
	28	#define PCA9532_REG_INPUT(i) ((i) >> 3)
	29	#define PCA9532_REG_OFFSET(m) ((m) >> 4)
	30	#define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
	31	#define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
	32	#define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
	33	#define LED_NUM(led) (led & 0x3)
e14fa824 RV	34
	35	#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
	36
3dbf622c JW	37	struct pca9532_chip_info {
	38	u8 num_leds;
	39	};
	40
e14fa824 RV	41	struct pca9532_data {
	42	struct i2c_client *client;
	43	struct pca9532_led leds[16];
	44	struct mutex update_lock;
85c5204a	45	struct input_dev *idev;
07172d2b	46	struct work_struct work;
3c1ab50d JE	47	#ifdef CONFIG_LEDS_PCA9532_GPIO
	48	struct gpio_chip gpio;
	49	#endif
3dbf622c	50	const struct pca9532_chip_info *chip_info;
e14fa824 RV	51	u8 pwm[2];
	52	u8 psc[2];
	53	};
	54
	55	static int pca9532_probe(struct i2c_client *client,
	56	const struct i2c_device_id *id);
	57	static int pca9532_remove(struct i2c_client *client);
	58
3dbf622c JW	59	enum {
	60	pca9530,
	61	pca9531,
	62	pca9532,
	63	pca9533,
	64	};
	65
e14fa824	66	static const struct i2c_device_id pca9532_id[] = {
3dbf622c JW	67	{ "pca9530", pca9530 },
	68	{ "pca9531", pca9531 },
	69	{ "pca9532", pca9532 },
	70	{ "pca9533", pca9533 },
e14fa824 RV	71	{ }
	72	};
	73
	74	MODULE_DEVICE_TABLE(i2c, pca9532_id);
	75
3dbf622c JW	76	static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
	77	[pca9530] = {
	78	.num_leds = 2,
	79	},
	80	[pca9531] = {
	81	.num_leds = 8,
	82	},
	83	[pca9532] = {
	84	.num_leds = 16,
	85	},
	86	[pca9533] = {
	87	.num_leds = 4,
	88	},
	89	};
	90
fa4191a6 PR	91	#ifdef CONFIG_OF
	92	static const struct of_device_id of_pca9532_leds_match[] = {
	93	{ .compatible = "nxp,pca9530", .data = (void *)pca9530 },
	94	{ .compatible = "nxp,pca9531", .data = (void *)pca9531 },
	95	{ .compatible = "nxp,pca9532", .data = (void *)pca9532 },
	96	{ .compatible = "nxp,pca9533", .data = (void *)pca9533 },
	97	{},
	98	};
	99
	100	MODULE_DEVICE_TABLE(of, of_pca9532_leds_match);
	101	#endif
	102
e14fa824 RV	103	static struct i2c_driver pca9532_driver = {
e14fa824 RV	104	.driver = {
30cb35be	105	.name = "leds-pca953x",
fa4191a6	106	.of_match_table = of_match_ptr(of_pca9532_leds_match),
e14fa824	107	},
85c5204a	108	.probe = pca9532_probe,
e14fa824 RV	109	.remove = pca9532_remove,
	110	.id_table = pca9532_id,
	111	};
	112
25985edc	113	/* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
e14fa824 RV	114	* the clever Thecus people are using one pwm to drive the beeper. So,
	115	* as a compromise we average one pwm to the values requested by all
	116	* leds that are not ON/OFF.
	117	* */
934cd3f9	118	static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
e14fa824 RV	119	enum led_brightness value)
	120	{
	121	int a = 0, b = 0, i = 0;
	122	struct pca9532_data *data = i2c_get_clientdata(client);
3dbf622c	123	for (i = 0; i < data->chip_info->num_leds; i++) {
e14fa824 RV	124	if (data->leds[i].type == PCA9532_TYPE_LED &&
	125	data->leds[i].state == PCA9532_PWM0+pwm) {
	126	a++;
	127	b += data->leds[i].ldev.brightness;
	128	}
	129	}
	130	if (a == 0) {
	131	dev_err(&client->dev,
	132	"fear of division by zero %d/%d, wanted %d\n",
	133	b, a, value);
	134	return -EINVAL;
	135	}
	136	b = b/a;
	137	if (b > 0xFF)
	138	return -EINVAL;
e14fa824	139	data->pwm[pwm] = b;
07172d2b AO	140	data->psc[pwm] = blink;
07172d2b AO	141	return 0;
934cd3f9 RV	142	}
	143
	144	static int pca9532_setpwm(struct i2c_client *client, int pwm)
	145	{
07172d2b	146	struct pca9532_data *data = i2c_get_clientdata(client);
3dbf622c JW	147	u8 maxleds = data->chip_info->num_leds;
3dbf622c JW	148
07172d2b	149	mutex_lock(&data->update_lock);
3dbf622c	150	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
e14fa824	151	data->pwm[pwm]);
3dbf622c	152	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
e14fa824 RV	153	data->psc[pwm]);
	154	mutex_unlock(&data->update_lock);
	155	return 0;
	156	}
	157
	158	/* Set LED routing */
	159	static void pca9532_setled(struct pca9532_led *led)
	160	{
	161	struct i2c_client *client = led->client;
	162	struct pca9532_data *data = i2c_get_clientdata(client);
3dbf622c	163	u8 maxleds = data->chip_info->num_leds;
e14fa824 RV	164	char reg;
	165
	166	mutex_lock(&data->update_lock);
3dbf622c	167	reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
e14fa824 RV	168	/* zero led bits */
	169	reg = reg & ~(0x3<<LED_NUM(led->id)*2);
	170	/* set the new value */
	171	reg = reg \| (led->state << LED_NUM(led->id)*2);
3dbf622c	172	i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
e14fa824 RV	173	mutex_unlock(&data->update_lock);
	174	}
	175
00a88a19	176	static int pca9532_set_brightness(struct led_classdev *led_cdev,
e14fa824 RV	177	enum led_brightness value)
	178	{
	179	int err = 0;
	180	struct pca9532_led *led = ldev_to_led(led_cdev);
	181
	182	if (value == LED_OFF)
	183	led->state = PCA9532_OFF;
	184	else if (value == LED_FULL)
	185	led->state = PCA9532_ON;
	186	else {
	187	led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
07172d2b	188	err = pca9532_calcpwm(led->client, 0, 0, value);
e14fa824	189	if (err)
00a88a19	190	return err;
e14fa824	191	}
00a88a19 AL	192	if (led->state == PCA9532_PWM0)
	193	pca9532_setpwm(led->client, 0);
	194	pca9532_setled(led);
	195	return err;
e14fa824 RV	196	}
	197
	198	static int pca9532_set_blink(struct led_classdev *led_cdev,
	199	unsigned long delay_on, unsigned long delay_off)
	200	{
	201	struct pca9532_led *led = ldev_to_led(led_cdev);
	202	struct i2c_client *client = led->client;
	203	int psc;
07172d2b	204	int err = 0;
e14fa824 RV	205
e14fa824 RV	206	if (delay_on == 0 && delay_off == 0) {
962363ce	207	/* led subsystem ask us for a blink rate */
85c5204a	208	*delay_on = 1000;
e14fa824 RV	209	*delay_off = 1000;
	210	}
	211	if (delay_on != delay_off \|\| delay_on > 1690 \|\| delay_on < 6)
	212	return -EINVAL;
	213
	214	/* Thecus specific: only use PSC/PWM 0 */
	215	psc = (delay_on 152-1)/1000;
07172d2b AO	216	err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
	217	if (err)
	218	return err;
00a88a19 AL	219	if (led->state == PCA9532_PWM0)
	220	pca9532_setpwm(led->client, 0);
	221	pca9532_setled(led);
	222
07172d2b	223	return 0;
e14fa824 RV	224	}
e14fa824 RV	225
0d733579 SW	226	static int pca9532_event(struct input_dev *dev, unsigned int type,
0d733579 SW	227	unsigned int code, int value)
e14fa824 RV	228	{
	229	struct pca9532_data *data = input_get_drvdata(dev);
	230
7fbc3a9b	231	if (!(type == EV_SND && (code == SND_BELL \|\| code == SND_TONE)))
e14fa824 RV	232	return -1;
	233
	234	/* XXX: allow different kind of beeps with psc/pwm modifications */
	235	if (value > 1 && value < 32767)
	236	data->pwm[1] = 127;
	237	else
	238	data->pwm[1] = 0;
	239
07172d2b	240	schedule_work(&data->work);
934cd3f9	241
07172d2b	242	return 0;
934cd3f9 RV	243	}
	244
	245	static void pca9532_input_work(struct work_struct *work)
	246	{
3dbf622c JW	247	struct pca9532_data *data =
	248	container_of(work, struct pca9532_data, work);
	249	u8 maxleds = data->chip_info->num_leds;
	250
e14fa824	251	mutex_lock(&data->update_lock);
3dbf622c	252	i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
e14fa824 RV	253	data->pwm[1]);
e14fa824 RV	254	mutex_unlock(&data->update_lock);
934cd3f9	255	}
e14fa824	256
3c1ab50d JE	257	#ifdef CONFIG_LEDS_PCA9532_GPIO
	258	static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
	259	{
dced1467	260	struct pca9532_data *data = gpiochip_get_data(gc);
3c1ab50d JE	261	struct pca9532_led *led = &data->leds[offset];
	262
	263	if (led->type == PCA9532_TYPE_GPIO)
	264	return 0;
	265
	266	return -EBUSY;
	267	}
	268
	269	static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
	270	{
dced1467	271	struct pca9532_data *data = gpiochip_get_data(gc);
3c1ab50d JE	272	struct pca9532_led *led = &data->leds[offset];
	273
	274	if (val)
	275	led->state = PCA9532_ON;
	276	else
	277	led->state = PCA9532_OFF;
	278
	279	pca9532_setled(led);
	280	}
	281
	282	static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
	283	{
dced1467	284	struct pca9532_data *data = gpiochip_get_data(gc);
3c1ab50d JE	285	unsigned char reg;
	286
	287	reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
	288
	289	return !!(reg & (1 << (offset % 8)));
	290	}
	291
	292	static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
	293	{
	294	/* To use as input ensure pin is not driven */
	295	pca9532_gpio_set_value(gc, offset, 0);
	296
	297	return 0;
	298	}
	299
	300	static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
	301	{
	302	pca9532_gpio_set_value(gc, offset, val);
	303
	304	return 0;
	305	}
	306	#endif /* CONFIG_LEDS_PCA9532_GPIO */
	307
	308	static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
125c7135 AL	309	{
	310	int i = n_devs;
	311
	312	if (!data)
3c1ab50d	313	return -EINVAL;
125c7135 AL	314
	315	while (--i >= 0) {
	316	switch (data->leds[i].type) {
	317	case PCA9532_TYPE_NONE:
3c1ab50d	318	case PCA9532_TYPE_GPIO:
125c7135 AL	319	break;
	320	case PCA9532_TYPE_LED:
	321	led_classdev_unregister(&data->leds[i].ldev);
125c7135 AL	322	break;
	323	case PCA9532_TYPE_N2100_BEEP:
	324	if (data->idev != NULL) {
125c7135 AL	325	cancel_work_sync(&data->work);
	326	data->idev = NULL;
	327	}
	328	break;
	329	}
	330	}
3c1ab50d JE	331
3c1ab50d JE	332	#ifdef CONFIG_LEDS_PCA9532_GPIO
58383c78	333	if (data->gpio.parent)
88d5e520	334	gpiochip_remove(&data->gpio);
3c1ab50d JE	335	#endif
	336
	337	return 0;
125c7135 AL	338	}
125c7135 AL	339
e14fa824 RV	340	static int pca9532_configure(struct i2c_client *client,
	341	struct pca9532_data data, struct pca9532_platform_data pdata)
	342	{
	343	int i, err = 0;
3c1ab50d	344	int gpios = 0;
3dbf622c	345	u8 maxleds = data->chip_info->num_leds;
e14fa824 RV	346
	347	for (i = 0; i < 2; i++) {
	348	data->pwm[i] = pdata->pwm[i];
	349	data->psc[i] = pdata->psc[i];
3dbf622c	350	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
e14fa824	351	data->pwm[i]);
3dbf622c	352	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
e14fa824 RV	353	data->psc[i]);
	354	}
	355
3dbf622c	356	for (i = 0; i < data->chip_info->num_leds; i++) {
e14fa824 RV	357	struct pca9532_led *led = &data->leds[i];
	358	struct pca9532_led *pled = &pdata->leds[i];
	359	led->client = client;
	360	led->id = i;
	361	led->type = pled->type;
	362	switch (led->type) {
	363	case PCA9532_TYPE_NONE:
	364	break;
3c1ab50d JE	365	case PCA9532_TYPE_GPIO:
	366	gpios++;
	367	break;
e14fa824 RV	368	case PCA9532_TYPE_LED:
e14fa824 RV	369	led->state = pled->state;
85c5204a	370	led->name = pled->name;
e14fa824	371	led->ldev.name = led->name;
90a5537b	372	led->ldev.default_trigger = pled->default_trigger;
e14fa824	373	led->ldev.brightness = LED_OFF;
00a88a19 AL	374	led->ldev.brightness_set_blocking =
00a88a19 AL	375	pca9532_set_brightness;
e14fa824	376	led->ldev.blink_set = pca9532_set_blink;
f785d022 SW	377	err = led_classdev_register(&client->dev, &led->ldev);
f785d022 SW	378	if (err < 0) {
e14fa824 RV	379	dev_err(&client->dev,
	380	"couldn't register LED %s\n",
	381	led->name);
	382	goto exit;
	383	}
	384	pca9532_setled(led);
	385	break;
	386	case PCA9532_TYPE_N2100_BEEP:
	387	BUG_ON(data->idev);
	388	led->state = PCA9532_PWM1;
	389	pca9532_setled(led);
8614fb46	390	data->idev = devm_input_allocate_device(&client->dev);
e14fa824 RV	391	if (data->idev == NULL) {
	392	err = -ENOMEM;
	393	goto exit;
	394	}
	395	data->idev->name = pled->name;
	396	data->idev->phys = "i2c/pca9532";
	397	data->idev->id.bustype = BUS_HOST;
85c5204a	398	data->idev->id.vendor = 0x001f;
e14fa824 RV	399	data->idev->id.product = 0x0001;
	400	data->idev->id.version = 0x0100;
	401	data->idev->evbit[0] = BIT_MASK(EV_SND);
	402	data->idev->sndbit[0] = BIT_MASK(SND_BELL) \|
	403	BIT_MASK(SND_TONE);
	404	data->idev->event = pca9532_event;
	405	input_set_drvdata(data->idev, data);
07172d2b	406	INIT_WORK(&data->work, pca9532_input_work);
e14fa824 RV	407	err = input_register_device(data->idev);
e14fa824 RV	408	if (err) {
07172d2b	409	cancel_work_sync(&data->work);
e14fa824 RV	410	data->idev = NULL;
	411	goto exit;
	412	}
	413	break;
	414	}
	415	}
3c1ab50d JE	416
	417	#ifdef CONFIG_LEDS_PCA9532_GPIO
	418	if (gpios) {
	419	data->gpio.label = "gpio-pca9532";
	420	data->gpio.direction_input = pca9532_gpio_direction_input;
	421	data->gpio.direction_output = pca9532_gpio_direction_output;
	422	data->gpio.set = pca9532_gpio_set_value;
	423	data->gpio.get = pca9532_gpio_get_value;
	424	data->gpio.request = pca9532_gpio_request_pin;
	425	data->gpio.can_sleep = 1;
	426	data->gpio.base = pdata->gpio_base;
3dbf622c	427	data->gpio.ngpio = data->chip_info->num_leds;
58383c78	428	data->gpio.parent = &client->dev;
3c1ab50d JE	429	data->gpio.owner = THIS_MODULE;
3c1ab50d JE	430
dced1467	431	err = gpiochip_add_data(&data->gpio, data);
3c1ab50d JE	432	if (err) {
3c1ab50d JE	433	/* Use data->gpio.dev as a flag for freeing gpiochip */
58383c78	434	data->gpio.parent = NULL;
3c1ab50d JE	435	dev_warn(&client->dev, "could not add gpiochip\n");
	436	} else {
	437	dev_info(&client->dev, "gpios %i...%i\n",
	438	data->gpio.base, data->gpio.base +
	439	data->gpio.ngpio - 1);
	440	}
	441	}
	442	#endif
	443
e14fa824 RV	444	return 0;
	445
	446	exit:
125c7135	447	pca9532_destroy_devices(data, i);
e14fa824	448	return err;
e14fa824 RV	449	}
e14fa824 RV	450
fa4191a6 PR	451	static struct pca9532_platform_data *
	452	pca9532_of_populate_pdata(struct device dev, struct device_node np)
	453	{
	454	struct pca9532_platform_data *pdata;
	455	struct device_node *child;
	456	const struct of_device_id *match;
	457	int devid, maxleds;
	458	int i = 0;
	459
	460	match = of_match_device(of_pca9532_leds_match, dev);
	461	if (!match)
	462	return ERR_PTR(-ENODEV);
	463
	464	devid = (int)(uintptr_t)match->data;
	465	maxleds = pca9532_chip_info_tbl[devid].num_leds;
	466
	467	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	468	if (!pdata)
	469	return ERR_PTR(-ENOMEM);
	470
	471	for_each_child_of_node(np, child) {
	472	if (of_property_read_string(child, "label",
	473	&pdata->leds[i].name))
	474	pdata->leds[i].name = child->name;
	475	of_property_read_u32(child, "type", &pdata->leds[i].type);
	476	of_property_read_string(child, "linux,default-trigger",
	477	&pdata->leds[i].default_trigger);
	478	if (++i >= maxleds) {
	479	of_node_put(child);
	480	break;
	481	}
	482	}
	483
	484	return pdata;
	485	}
	486
e14fa824 RV	487	static int pca9532_probe(struct i2c_client *client,
	488	const struct i2c_device_id *id)
	489	{
fa4191a6	490	int devid;
e14fa824	491	struct pca9532_data *data = i2c_get_clientdata(client);
87aae1ea JH	492	struct pca9532_platform_data *pca9532_pdata =
87aae1ea JH	493	dev_get_platdata(&client->dev);
fa4191a6 PR	494	struct device_node *np = client->dev.of_node;
	495
	496	if (!pca9532_pdata) {
	497	if (np) {
	498	pca9532_pdata =
	499	pca9532_of_populate_pdata(&client->dev, np);
	500	if (IS_ERR(pca9532_pdata))
	501	return PTR_ERR(pca9532_pdata);
	502	} else {
	503	dev_err(&client->dev, "no platform data\n");
	504	return -EINVAL;
	505	}
	506	devid = (int)(uintptr_t)of_match_device(
	507	of_pca9532_leds_match, &client->dev)->data;
	508	} else {
	509	devid = id->driver_data;
	510	}
e14fa824 RV	511
	512	if (!i2c_check_functionality(client->adapter,
	513	I2C_FUNC_SMBUS_BYTE_DATA))
	514	return -EIO;
	515
0f4630c9	516	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
e14fa824 RV	517	if (!data)
	518	return -ENOMEM;
	519
fa4191a6	520	data->chip_info = &pca9532_chip_info_tbl[devid];
3dbf622c	521
e14fa824 RV	522	dev_info(&client->dev, "setting platform data\n");
	523	i2c_set_clientdata(client, data);
	524	data->client = client;
	525	mutex_init(&data->update_lock);
	526
0f4630c9	527	return pca9532_configure(client, data, pca9532_pdata);
e14fa824 RV	528	}
	529
	530	static int pca9532_remove(struct i2c_client *client)
	531	{
	532	struct pca9532_data *data = i2c_get_clientdata(client);
3c1ab50d JE	533	int err;
3c1ab50d JE	534
3dbf622c	535	err = pca9532_destroy_devices(data, data->chip_info->num_leds);
3c1ab50d JE	536	if (err)
	537	return err;
	538
e14fa824 RV	539	return 0;
	540	}
	541
09a0d183	542	module_i2c_driver(pca9532_driver);
e14fa824	543
b26e0ed4	544	MODULE_AUTHOR("Riku Voipio");
e14fa824 RV	545	MODULE_LICENSE("GPL");
e14fa824 RV	546	MODULE_DESCRIPTION("PCA 9532 LED dimmer");