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

/*
 * pca9532.c - 16-bit Led dimmer
 *
 * Copyright (C) 2008 Riku Voipio <riku.voipio@movial.fi>
 *
 * 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/leds.h>
#include <linux/input.h>
#include <linux/mutex.h>
#include <linux/leds-pca9532.h>

static const unsigned short normal_i2c[] = { /*0x60,*/ I2C_CLIENT_END};
I2C_CLIENT_INSMOD_1(pca9532);

#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;
	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_setpwm(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;
	mutex_lock(&data->update_lock);
	data->pwm[pwm] = b;
	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm),
		data->pwm[pwm]);
	data->psc[pwm] = blink;
	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_setpwm(led->client, 0, 0, value);
		if (err)
			return; /* XXX: led api doesn't allow error code? */
	}
	pca9532_setled(led);
}

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;

	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;
	return pca9532_setpwm(client, 0, psc, led_cdev->brightness);
}

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;

	dev_info(&dev->dev, "setting beep to %d \n", data->pwm[1]);
	mutex_lock(&data->update_lock);
	i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1),
		data->pwm[1]);
	mutex_unlock(&data->update_lock);

	return 0;
}

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;
			if (led_classdev_register(&client->dev,
				&led->ldev) < 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);
			err = input_register_device(data->idev);
			if (err) {
				input_free_device(data->idev);
				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);
				break;
			case PCA9532_TYPE_N2100_BEEP:
				if (data->idev != NULL) {
					input_unregister_device(data->idev);
					input_free_device(data->idev);
					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;

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

	data = kzalloc(sizeof(struct pca9532_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);

	if (pca9532_pdata == NULL)
		return -EIO;

	pca9532_configure(client, data, pca9532_pdata);
	return 0;

}

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);
			break;
		case PCA9532_TYPE_N2100_BEEP:
			if (data->idev != NULL) {
				input_unregister_device(data->idev);
				input_free_device(data->idev);
				data->idev = NULL;
			}
			break;
		}

	kfree(data);
	i2c_set_clientdata(client, NULL);
	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 <riku.voipio@movial.fi>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PCA 9532 LED dimmer");

module_init(pca9532_init);
module_exit(pca9532_exit);
Commit	Line	Data
e14fa824 RV	1	/*
	2	* pca9532.c - 16-bit Led dimmer
	3	*
	4	* Copyright (C) 2008 Riku Voipio <riku.voipio@movial.fi>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; version 2 of the License.
	9	*
	10	* Datasheet: http://www.nxp.com/acrobat/datasheets/PCA9532_3.pdf
	11	*
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/i2c.h>
	16	#include <linux/leds.h>
	17	#include <linux/input.h>
	18	#include <linux/mutex.h>
	19	#include <linux/leds-pca9532.h>
	20
	21	static const unsigned short normal_i2c[] = { /0x60,/ I2C_CLIENT_END};
	22	I2C_CLIENT_INSMOD_1(pca9532);
	23
	24	#define PCA9532_REG_PSC(i) (0x2+(i)*2)
	25	#define PCA9532_REG_PWM(i) (0x3+(i)*2)
	26	#define PCA9532_REG_LS0 0x6
	27	#define LED_REG(led) ((led>>2)+PCA9532_REG_LS0)
	28	#define LED_NUM(led) (led & 0x3)
	29
	30	#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
	31
	32	struct pca9532_data {
	33	struct i2c_client *client;
	34	struct pca9532_led leds[16];
	35	struct mutex update_lock;
	36	struct input_dev *idev;
	37	u8 pwm[2];
	38	u8 psc[2];
	39	};
	40
	41	static int pca9532_probe(struct i2c_client *client,
	42	const struct i2c_device_id *id);
	43	static int pca9532_remove(struct i2c_client *client);
	44
	45	static const struct i2c_device_id pca9532_id[] = {
	46	{ "pca9532", 0 },
	47	{ }
	48	};
	49
	50	MODULE_DEVICE_TABLE(i2c, pca9532_id);
	51
	52	static struct i2c_driver pca9532_driver = {
	53	.driver = {
	54	.name = "pca9532",
	55	},
	56	.probe = pca9532_probe,
	57	.remove = pca9532_remove,
	58	.id_table = pca9532_id,
	59	};
	60
	61	/* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly,
	62	* the clever Thecus people are using one pwm to drive the beeper. So,
	63	* as a compromise we average one pwm to the values requested by all
	64	* leds that are not ON/OFF.
65	* */
66	static int pca9532_setpwm(struct i2c_client *client, int pwm, int blink,
67	enum led_brightness value)
68	{
69	int a = 0, b = 0, i = 0;
70	struct pca9532_data *data = i2c_get_clientdata(client);
71	for (i = 0; i < 16; i++) {
72	if (data->leds[i].type == PCA9532_TYPE_LED &&
73	data->leds[i].state == PCA9532_PWM0+pwm) {
74	a++;
75	b += data->leds[i].ldev.brightness;
76	}
77	}
78	if (a == 0) {
79	dev_err(&client->dev,
80	"fear of division by zero %d/%d, wanted %d\n",
81	b, a, value);
82	return -EINVAL;
83	}
84	b = b/a;
85	if (b > 0xFF)
86	return -EINVAL;
87	mutex_lock(&data->update_lock);
88	data->pwm[pwm] = b;
89	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm),
90	data->pwm[pwm]);
91	data->psc[pwm] = blink;
92	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm),
93	data->psc[pwm]);
94	mutex_unlock(&data->update_lock);
95	return 0;
96	}
97
98	/* Set LED routing */
99	static void pca9532_setled(struct pca9532_led *led)
100	{
101	struct i2c_client *client = led->client;
102	struct pca9532_data *data = i2c_get_clientdata(client);
103	char reg;
104
105	mutex_lock(&data->update_lock);
106	reg = i2c_smbus_read_byte_data(client, LED_REG(led->id));
107	/* zero led bits */
108	reg = reg & ~(0x3<<LED_NUM(led->id)*2);
109	/* set the new value */
110	reg = reg \| (led->state << LED_NUM(led->id)*2);
111	i2c_smbus_write_byte_data(client, LED_REG(led->id), reg);
112	mutex_unlock(&data->update_lock);
113	}
114
115	static void pca9532_set_brightness(struct led_classdev *led_cdev,
116	enum led_brightness value)
117	{
118	int err = 0;
119	struct pca9532_led *led = ldev_to_led(led_cdev);
120
121	if (value == LED_OFF)
122	led->state = PCA9532_OFF;
123	else if (value == LED_FULL)
124	led->state = PCA9532_ON;
125	else {
126	led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
127	err = pca9532_setpwm(led->client, 0, 0, value);
128	if (err)
129	return; /* XXX: led api doesn't allow error code? */
130	}
131	pca9532_setled(led);
132	}
133
134	static int pca9532_set_blink(struct led_classdev *led_cdev,
135	unsigned long delay_on, unsigned long delay_off)
136	{
137	struct pca9532_led *led = ldev_to_led(led_cdev);
138	struct i2c_client *client = led->client;
139	int psc;
140
141	if (delay_on == 0 && delay_off == 0) {
142	/* led subsystem ask us for a blink rate */
143	*delay_on = 1000;
144	*delay_off = 1000;
145	}
146	if (delay_on != delay_off \|\| delay_on > 1690 \|\| delay_on < 6)
147	return -EINVAL;
148
149	/* Thecus specific: only use PSC/PWM 0 */
150	psc = (delay_on 152-1)/1000;
151	return pca9532_setpwm(client, 0, psc, led_cdev->brightness);
152	}
153
0d733579 SW	154	static int pca9532_event(struct input_dev *dev, unsigned int type,
0d733579 SW	155	unsigned int code, int value)
e14fa824 RV	156	{
	157	struct pca9532_data *data = input_get_drvdata(dev);
	158
	159	if (type != EV_SND && (code != SND_BELL \|\| code != SND_TONE))
	160	return -1;
	161
	162	/* XXX: allow different kind of beeps with psc/pwm modifications */
	163	if (value > 1 && value < 32767)
	164	data->pwm[1] = 127;
	165	else
	166	data->pwm[1] = 0;
	167
	168	dev_info(&dev->dev, "setting beep to %d \n", data->pwm[1]);
	169	mutex_lock(&data->update_lock);
	170	i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1),
	171	data->pwm[1]);
	172	mutex_unlock(&data->update_lock);
	173
	174	return 0;
	175	}
	176
	177	static int pca9532_configure(struct i2c_client *client,
	178	struct pca9532_data data, struct pca9532_platform_data pdata)
	179	{
	180	int i, err = 0;
	181
	182	for (i = 0; i < 2; i++) {
	183	data->pwm[i] = pdata->pwm[i];
	184	data->psc[i] = pdata->psc[i];
	185	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i),
	186	data->pwm[i]);
	187	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i),
	188	data->psc[i]);
	189	}
	190
	191	for (i = 0; i < 16; i++) {
	192	struct pca9532_led *led = &data->leds[i];
	193	struct pca9532_led *pled = &pdata->leds[i];
	194	led->client = client;
	195	led->id = i;
	196	led->type = pled->type;
	197	switch (led->type) {
	198	case PCA9532_TYPE_NONE:
	199	break;
	200	case PCA9532_TYPE_LED:
	201	led->state = pled->state;
	202	led->name = pled->name;
	203	led->ldev.name = led->name;
	204	led->ldev.brightness = LED_OFF;
	205	led->ldev.brightness_set = pca9532_set_brightness;
	206	led->ldev.blink_set = pca9532_set_blink;
	207	if (led_classdev_register(&client->dev,
	208	&led->ldev) < 0) {
	209	dev_err(&client->dev,
	210	"couldn't register LED %s\n",
	211	led->name);
	212	goto exit;
	213	}
	214	pca9532_setled(led);
	215	break;
	216	case PCA9532_TYPE_N2100_BEEP:
	217	BUG_ON(data->idev);
	218	led->state = PCA9532_PWM1;
	219	pca9532_setled(led);
220	data->idev = input_allocate_device();
221	if (data->idev == NULL) {
222	err = -ENOMEM;
223	goto exit;
224	}
225	data->idev->name = pled->name;
226	data->idev->phys = "i2c/pca9532";
227	data->idev->id.bustype = BUS_HOST;
228	data->idev->id.vendor = 0x001f;
229	data->idev->id.product = 0x0001;
230	data->idev->id.version = 0x0100;
231	data->idev->evbit[0] = BIT_MASK(EV_SND);
232	data->idev->sndbit[0] = BIT_MASK(SND_BELL) \|
233	BIT_MASK(SND_TONE);
234	data->idev->event = pca9532_event;
235	input_set_drvdata(data->idev, data);
236	err = input_register_device(data->idev);
237	if (err) {
238	input_free_device(data->idev);
239	data->idev = NULL;
240	goto exit;
241	}
242	break;
243	}
244	}
245	return 0;
246
247	exit:
248	if (i > 0)
249	for (i = i - 1; i >= 0; i--)
250	switch (data->leds[i].type) {
251	case PCA9532_TYPE_NONE:
252	break;
253	case PCA9532_TYPE_LED:
254	led_classdev_unregister(&data->leds[i].ldev);
255	break;
256	case PCA9532_TYPE_N2100_BEEP:
257	if (data->idev != NULL) {
258	input_unregister_device(data->idev);
259	input_free_device(data->idev);
260	data->idev = NULL;
261	}
262	break;
263	}
264
265	return err;
266
267	}
268
269	static int pca9532_probe(struct i2c_client *client,
270	const struct i2c_device_id *id)
271	{
272	struct pca9532_data *data = i2c_get_clientdata(client);
273	struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
274
275	if (!i2c_check_functionality(client->adapter,
276	I2C_FUNC_SMBUS_BYTE_DATA))
277	return -EIO;
278
279	data = kzalloc(sizeof(struct pca9532_data), GFP_KERNEL);
280	if (!data)
281	return -ENOMEM;
282
283	dev_info(&client->dev, "setting platform data\n");
284	i2c_set_clientdata(client, data);
285	data->client = client;
286	mutex_init(&data->update_lock);
287
288	if (pca9532_pdata == NULL)
289	return -EIO;
290
291	pca9532_configure(client, data, pca9532_pdata);
292	return 0;
293
294	}
295
296	static int pca9532_remove(struct i2c_client *client)
297	{
298	struct pca9532_data *data = i2c_get_clientdata(client);
299	int i;
300	for (i = 0; i < 16; i++)
301	switch (data->leds[i].type) {
302	case PCA9532_TYPE_NONE:
303	break;
304	case PCA9532_TYPE_LED:
305	led_classdev_unregister(&data->leds[i].ldev);
306	break;
307	case PCA9532_TYPE_N2100_BEEP:
308	if (data->idev != NULL) {
309	input_unregister_device(data->idev);
310	input_free_device(data->idev);
311	data->idev = NULL;
312	}
313	break;
314	}
315
316	kfree(data);
317	i2c_set_clientdata(client, NULL);
318	return 0;
319	}
320
321	static int __init pca9532_init(void)
322	{
323	return i2c_add_driver(&pca9532_driver);
324	}
325
326	static void __exit pca9532_exit(void)
327	{
328	i2c_del_driver(&pca9532_driver);
329	}
330
331	MODULE_AUTHOR("Riku Voipio <riku.voipio@movial.fi>");
332	MODULE_LICENSE("GPL");
333	MODULE_DESCRIPTION("PCA 9532 LED dimmer");
334
335	module_init(pca9532_init);
336	module_exit(pca9532_exit);
337