blob: 4064d4f6b33b41a99d093d3e05c65f281ed60588 [file] [log] [blame]
Riku Voipioe14fa822008-05-31 14:43:41 +01001/*
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
21static const unsigned short normal_i2c[] = { /*0x60,*/ I2C_CLIENT_END};
22I2C_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
32struct 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
41static int pca9532_probe(struct i2c_client *client,
42 const struct i2c_device_id *id);
43static int pca9532_remove(struct i2c_client *client);
44
45static const struct i2c_device_id pca9532_id[] = {
46 { "pca9532", 0 },
47 { }
48};
49
50MODULE_DEVICE_TABLE(i2c, pca9532_id);
51
52static 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 * */
66static 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 */
99static 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
115static 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
134static 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
154int pca9532_event(struct input_dev *dev, unsigned int type, unsigned int code,
155 int value)
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
177static 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
247exit:
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
269static 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
296static 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
321static int __init pca9532_init(void)
322{
323 return i2c_add_driver(&pca9532_driver);
324}
325
326static void __exit pca9532_exit(void)
327{
328 i2c_del_driver(&pca9532_driver);
329}
330
331MODULE_AUTHOR("Riku Voipio <riku.voipio@movial.fi>");
332MODULE_LICENSE("GPL");
333MODULE_DESCRIPTION("PCA 9532 LED dimmer");
334
335module_init(pca9532_init);
336module_exit(pca9532_exit);
337