drivers/leds/leds-pca9532.c - kernel/msm - Gitiles

 /*
  * pca9532.c - 16-bit Led dimmer
  *
  * 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/acrobat/datasheets/PCA9532_3.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>

 #define PCA9532_REG_PSC(i) (0x2+(i)*2)
 #define PCA9532_REG_PWM(i) (0x3+(i)*2)
 #define PCA9532_REG_LS0  0x6
 #define LED_REG(led) ((led>>2)+PCA9532_REG_LS0)
 #define LED_NUM(led) (led & 0x3)

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

 struct pca9532_data {
 	struct i2c_client *client;
 	struct pca9532_led leds[16];
 	struct mutex update_lock;
 	struct input_dev *idev;
 	struct work_struct work;
 	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);

 static const struct i2c_device_id pca9532_id[] = {
 	{ "pca9532", 0 },
 	{ }
 };

 MODULE_DEVICE_TABLE(i2c, pca9532_id);

 static struct i2c_driver pca9532_driver = {
 	.driver = {
 		.name = "pca9532",
 	},
 	.probe = pca9532_probe,
 	.remove = pca9532_remove,
 	.id_table = pca9532_id,
 };

 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly,
  * 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 < 16; 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);
 	mutex_lock(&data->update_lock);
 	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm),
 		data->pwm[pwm]);
 	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(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);
 	char reg;

 	mutex_lock(&data->update_lock);
 	reg = i2c_smbus_read_byte_data(client, LED_REG(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(led->id), reg);
 	mutex_unlock(&data->update_lock);
 }

 static void 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; /* XXX: led api doesn't allow error code? */
 	}
 	schedule_work(&led->work);
 }

 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;
 	schedule_work(&led->work);
 	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;
 	data = container_of(work, struct pca9532_data, work);
 	mutex_lock(&data->update_lock);
 	i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1),
 		data->pwm[1]);
 	mutex_unlock(&data->update_lock);
 }

 static void pca9532_led_work(struct work_struct *work)
 {
 	struct pca9532_led *led;
 	led = container_of(work, struct pca9532_led, work);
 	if (led->state == PCA9532_PWM0)
 		pca9532_setpwm(led->client, 0);
 	pca9532_setled(led);
 }

 static int pca9532_configure(struct i2c_client *client,
 	struct pca9532_data *data, struct pca9532_platform_data *pdata)
 {
 	int i, err = 0;

 	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(i),
 			data->pwm[i]);
 		i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i),
 			data->psc[i]);
 	}

 	for (i = 0; i < 16; 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_LED:
 			led->state = pled->state;
 			led->name = pled->name;
 			led->ldev.name = led->name;
 			led->ldev.brightness = LED_OFF;
 			led->ldev.brightness_set = pca9532_set_brightness;
 			led->ldev.blink_set = pca9532_set_blink;
 			INIT_WORK(&led->work, pca9532_led_work);
 			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 = input_allocate_device();
 			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) {
 				input_free_device(data->idev);
 				cancel_work_sync(&data->work);
 				data->idev = NULL;
 				goto exit;
 			}
 			break;
 		}
 	}
 	return 0;

 exit:
 	if (i > 0)
 		for (i = i - 1; i >= 0; i--)
 			switch (data->leds[i].type) {
 			case PCA9532_TYPE_NONE:
 				break;
 			case PCA9532_TYPE_LED:
 				led_classdev_unregister(&data->leds[i].ldev);
 				cancel_work_sync(&data->leds[i].work);
 				break;
 			case PCA9532_TYPE_N2100_BEEP:
 				if (data->idev != NULL) {
 					input_unregister_device(data->idev);
 					input_free_device(data->idev);
 					cancel_work_sync(&data->work);
 					data->idev = NULL;
 				}
 				break;
 			}

 	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 = client->dev.platform_data;
 	int err;

 	if (!pca9532_pdata)
 		return -EIO;

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

 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

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

 	err = pca9532_configure(client, data, pca9532_pdata);
 	if (err)
 		kfree(data);

 	return err;
 }

 static int pca9532_remove(struct i2c_client *client)
 {
 	struct pca9532_data *data = i2c_get_clientdata(client);
 	int i;
 	for (i = 0; i < 16; i++)
 		switch (data->leds[i].type) {
 		case PCA9532_TYPE_NONE:
 			break;
 		case PCA9532_TYPE_LED:
 			led_classdev_unregister(&data->leds[i].ldev);
 			cancel_work_sync(&data->leds[i].work);
 			break;
 		case PCA9532_TYPE_N2100_BEEP:
 			if (data->idev != NULL) {
 				input_unregister_device(data->idev);
 				input_free_device(data->idev);
 				cancel_work_sync(&data->work);
 				data->idev = NULL;
 			}
 			break;
 		}

 	kfree(data);
 	return 0;
 }

 static int __init pca9532_init(void)
 {
 	return i2c_add_driver(&pca9532_driver);
 }

 static void __exit pca9532_exit(void)
 {
 	i2c_del_driver(&pca9532_driver);
 }

 MODULE_AUTHOR("Riku Voipio");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("PCA 9532 LED dimmer");

 module_init(pca9532_init);
 module_exit(pca9532_exit);
	/*
	* pca9532.c - 16-bit Led dimmer
	*
	* 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/acrobat/datasheets/PCA9532_3.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>

	#define PCA9532_REG_PSC(i) (0x2+(i)*2)
	#define PCA9532_REG_PWM(i) (0x3+(i)*2)
	#define PCA9532_REG_LS0 0x6
	#define LED_REG(led) ((led>>2)+PCA9532_REG_LS0)
	#define LED_NUM(led) (led & 0x3)

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

	struct pca9532_data {
	struct i2c_client *client;
	struct pca9532_led leds[16];
	struct mutex update_lock;
	struct input_dev *idev;
	struct work_struct work;
	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);

	static const struct i2c_device_id pca9532_id[] = {
	{ "pca9532", 0 },
	{ }
	};

	MODULE_DEVICE_TABLE(i2c, pca9532_id);

	static struct i2c_driver pca9532_driver = {
	.driver = {
	.name = "pca9532",
	},
	.probe = pca9532_probe,
	.remove = pca9532_remove,
	.id_table = pca9532_id,
	};

	/* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly,
	* 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 < 16; 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);
	mutex_lock(&data->update_lock);
	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm),
	data->pwm[pwm]);
	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(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);
	char reg;

	mutex_lock(&data->update_lock);
	reg = i2c_smbus_read_byte_data(client, LED_REG(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(led->id), reg);
	mutex_unlock(&data->update_lock);
	}

	static void 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; /* XXX: led api doesn't allow error code? */
	}
	schedule_work(&led->work);
	}

	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;
	schedule_work(&led->work);
	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;
	data = container_of(work, struct pca9532_data, work);
	mutex_lock(&data->update_lock);
	i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1),
	data->pwm[1]);
	mutex_unlock(&data->update_lock);
	}

	static void pca9532_led_work(struct work_struct *work)
	{
	struct pca9532_led *led;
	led = container_of(work, struct pca9532_led, work);
	if (led->state == PCA9532_PWM0)
	pca9532_setpwm(led->client, 0);
	pca9532_setled(led);
	}

	static int pca9532_configure(struct i2c_client *client,
	struct pca9532_data data, struct pca9532_platform_data pdata)
	{
	int i, err = 0;

	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(i),
	data->pwm[i]);
	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i),
	data->psc[i]);
	}

	for (i = 0; i < 16; 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_LED:
	led->state = pled->state;
	led->name = pled->name;
	led->ldev.name = led->name;
	led->ldev.brightness = LED_OFF;
	led->ldev.brightness_set = pca9532_set_brightness;
	led->ldev.blink_set = pca9532_set_blink;
	INIT_WORK(&led->work, pca9532_led_work);
	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 = input_allocate_device();
	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) {
	input_free_device(data->idev);
	cancel_work_sync(&data->work);
	data->idev = NULL;
	goto exit;
	}
	break;
	}
	}
	return 0;

	exit:
	if (i > 0)
	for (i = i - 1; i >= 0; i--)
	switch (data->leds[i].type) {
	case PCA9532_TYPE_NONE:
	break;
	case PCA9532_TYPE_LED:
	led_classdev_unregister(&data->leds[i].ldev);
	cancel_work_sync(&data->leds[i].work);
	break;
	case PCA9532_TYPE_N2100_BEEP:
	if (data->idev != NULL) {
	input_unregister_device(data->idev);
	input_free_device(data->idev);
	cancel_work_sync(&data->work);
	data->idev = NULL;
	}
	break;
	}

	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 = client->dev.platform_data;
	int err;

	if (!pca9532_pdata)
	return -EIO;

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

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

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

	err = pca9532_configure(client, data, pca9532_pdata);
	if (err)
	kfree(data);

	return err;
	}

	static int pca9532_remove(struct i2c_client *client)
	{
	struct pca9532_data *data = i2c_get_clientdata(client);
	int i;
	for (i = 0; i < 16; i++)
	switch (data->leds[i].type) {
	case PCA9532_TYPE_NONE:
	break;
	case PCA9532_TYPE_LED:
	led_classdev_unregister(&data->leds[i].ldev);
	cancel_work_sync(&data->leds[i].work);
	break;
	case PCA9532_TYPE_N2100_BEEP:
	if (data->idev != NULL) {
	input_unregister_device(data->idev);
	input_free_device(data->idev);
	cancel_work_sync(&data->work);
	data->idev = NULL;
	}
	break;
	}

	kfree(data);
	return 0;
	}

	static int __init pca9532_init(void)
	{
	return i2c_add_driver(&pca9532_driver);
	}

	static void __exit pca9532_exit(void)
	{
	i2c_del_driver(&pca9532_driver);
	}

	MODULE_AUTHOR("Riku Voipio");
	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("PCA 9532 LED dimmer");

	module_init(pca9532_init);
	module_exit(pca9532_exit);