Commit | Line | Data |
---|---|---|
e14fa824 RV |
1 | /* |
2 | * pca9532.c - 16-bit Led dimmer | |
3 | * | |
b26e0ed4 | 4 | * Copyright (C) 2008 Riku Voipio |
e14fa824 RV |
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> | |
934cd3f9 | 19 | #include <linux/workqueue.h> |
e14fa824 RV |
20 | #include <linux/leds-pca9532.h> |
21 | ||
e14fa824 RV |
22 | #define PCA9532_REG_PSC(i) (0x2+(i)*2) |
23 | #define PCA9532_REG_PWM(i) (0x3+(i)*2) | |
24 | #define PCA9532_REG_LS0 0x6 | |
25 | #define LED_REG(led) ((led>>2)+PCA9532_REG_LS0) | |
26 | #define LED_NUM(led) (led & 0x3) | |
27 | ||
28 | #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) | |
29 | ||
30 | struct pca9532_data { | |
31 | struct i2c_client *client; | |
32 | struct pca9532_led leds[16]; | |
33 | struct mutex update_lock; | |
85c5204a | 34 | struct input_dev *idev; |
07172d2b | 35 | struct work_struct work; |
e14fa824 RV |
36 | u8 pwm[2]; |
37 | u8 psc[2]; | |
38 | }; | |
39 | ||
40 | static int pca9532_probe(struct i2c_client *client, | |
41 | const struct i2c_device_id *id); | |
42 | static int pca9532_remove(struct i2c_client *client); | |
43 | ||
44 | static const struct i2c_device_id pca9532_id[] = { | |
45 | { "pca9532", 0 }, | |
46 | { } | |
47 | }; | |
48 | ||
49 | MODULE_DEVICE_TABLE(i2c, pca9532_id); | |
50 | ||
51 | static struct i2c_driver pca9532_driver = { | |
52 | .driver = { | |
85c5204a | 53 | .name = "pca9532", |
e14fa824 | 54 | }, |
85c5204a | 55 | .probe = pca9532_probe, |
e14fa824 RV |
56 | .remove = pca9532_remove, |
57 | .id_table = pca9532_id, | |
58 | }; | |
59 | ||
60 | /* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly, | |
61 | * the clever Thecus people are using one pwm to drive the beeper. So, | |
62 | * as a compromise we average one pwm to the values requested by all | |
63 | * leds that are not ON/OFF. | |
64 | * */ | |
934cd3f9 | 65 | static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, |
e14fa824 RV |
66 | enum led_brightness value) |
67 | { | |
68 | int a = 0, b = 0, i = 0; | |
69 | struct pca9532_data *data = i2c_get_clientdata(client); | |
70 | for (i = 0; i < 16; i++) { | |
71 | if (data->leds[i].type == PCA9532_TYPE_LED && | |
72 | data->leds[i].state == PCA9532_PWM0+pwm) { | |
73 | a++; | |
74 | b += data->leds[i].ldev.brightness; | |
75 | } | |
76 | } | |
77 | if (a == 0) { | |
78 | dev_err(&client->dev, | |
79 | "fear of division by zero %d/%d, wanted %d\n", | |
80 | b, a, value); | |
81 | return -EINVAL; | |
82 | } | |
83 | b = b/a; | |
84 | if (b > 0xFF) | |
85 | return -EINVAL; | |
e14fa824 | 86 | data->pwm[pwm] = b; |
07172d2b AO |
87 | data->psc[pwm] = blink; |
88 | return 0; | |
934cd3f9 RV |
89 | } |
90 | ||
91 | static int pca9532_setpwm(struct i2c_client *client, int pwm) | |
92 | { | |
07172d2b AO |
93 | struct pca9532_data *data = i2c_get_clientdata(client); |
94 | mutex_lock(&data->update_lock); | |
e14fa824 RV |
95 | i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm), |
96 | data->pwm[pwm]); | |
e14fa824 RV |
97 | i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm), |
98 | data->psc[pwm]); | |
99 | mutex_unlock(&data->update_lock); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* Set LED routing */ | |
104 | static void pca9532_setled(struct pca9532_led *led) | |
105 | { | |
106 | struct i2c_client *client = led->client; | |
107 | struct pca9532_data *data = i2c_get_clientdata(client); | |
108 | char reg; | |
109 | ||
110 | mutex_lock(&data->update_lock); | |
111 | reg = i2c_smbus_read_byte_data(client, LED_REG(led->id)); | |
112 | /* zero led bits */ | |
113 | reg = reg & ~(0x3<<LED_NUM(led->id)*2); | |
114 | /* set the new value */ | |
115 | reg = reg | (led->state << LED_NUM(led->id)*2); | |
116 | i2c_smbus_write_byte_data(client, LED_REG(led->id), reg); | |
117 | mutex_unlock(&data->update_lock); | |
118 | } | |
119 | ||
120 | static void pca9532_set_brightness(struct led_classdev *led_cdev, | |
121 | enum led_brightness value) | |
122 | { | |
123 | int err = 0; | |
124 | struct pca9532_led *led = ldev_to_led(led_cdev); | |
125 | ||
126 | if (value == LED_OFF) | |
127 | led->state = PCA9532_OFF; | |
128 | else if (value == LED_FULL) | |
129 | led->state = PCA9532_ON; | |
130 | else { | |
131 | led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ | |
07172d2b | 132 | err = pca9532_calcpwm(led->client, 0, 0, value); |
e14fa824 RV |
133 | if (err) |
134 | return; /* XXX: led api doesn't allow error code? */ | |
135 | } | |
07172d2b | 136 | schedule_work(&led->work); |
e14fa824 RV |
137 | } |
138 | ||
139 | static int pca9532_set_blink(struct led_classdev *led_cdev, | |
140 | unsigned long *delay_on, unsigned long *delay_off) | |
141 | { | |
142 | struct pca9532_led *led = ldev_to_led(led_cdev); | |
143 | struct i2c_client *client = led->client; | |
144 | int psc; | |
07172d2b | 145 | int err = 0; |
e14fa824 RV |
146 | |
147 | if (*delay_on == 0 && *delay_off == 0) { | |
148 | /* led subsystem ask us for a blink rate */ | |
85c5204a | 149 | *delay_on = 1000; |
e14fa824 RV |
150 | *delay_off = 1000; |
151 | } | |
152 | if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) | |
153 | return -EINVAL; | |
154 | ||
155 | /* Thecus specific: only use PSC/PWM 0 */ | |
156 | psc = (*delay_on * 152-1)/1000; | |
07172d2b AO |
157 | err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); |
158 | if (err) | |
159 | return err; | |
160 | schedule_work(&led->work); | |
161 | return 0; | |
e14fa824 RV |
162 | } |
163 | ||
0d733579 SW |
164 | static int pca9532_event(struct input_dev *dev, unsigned int type, |
165 | unsigned int code, int value) | |
e14fa824 RV |
166 | { |
167 | struct pca9532_data *data = input_get_drvdata(dev); | |
168 | ||
7fbc3a9b | 169 | if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE))) |
e14fa824 RV |
170 | return -1; |
171 | ||
172 | /* XXX: allow different kind of beeps with psc/pwm modifications */ | |
173 | if (value > 1 && value < 32767) | |
174 | data->pwm[1] = 127; | |
175 | else | |
176 | data->pwm[1] = 0; | |
177 | ||
07172d2b | 178 | schedule_work(&data->work); |
934cd3f9 | 179 | |
07172d2b | 180 | return 0; |
934cd3f9 RV |
181 | } |
182 | ||
183 | static void pca9532_input_work(struct work_struct *work) | |
184 | { | |
07172d2b AO |
185 | struct pca9532_data *data; |
186 | data = container_of(work, struct pca9532_data, work); | |
e14fa824 RV |
187 | mutex_lock(&data->update_lock); |
188 | i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1), | |
189 | data->pwm[1]); | |
190 | mutex_unlock(&data->update_lock); | |
934cd3f9 | 191 | } |
e14fa824 | 192 | |
934cd3f9 RV |
193 | static void pca9532_led_work(struct work_struct *work) |
194 | { | |
07172d2b AO |
195 | struct pca9532_led *led; |
196 | led = container_of(work, struct pca9532_led, work); | |
197 | if (led->state == PCA9532_PWM0) | |
198 | pca9532_setpwm(led->client, 0); | |
199 | pca9532_setled(led); | |
e14fa824 RV |
200 | } |
201 | ||
202 | static int pca9532_configure(struct i2c_client *client, | |
203 | struct pca9532_data *data, struct pca9532_platform_data *pdata) | |
204 | { | |
205 | int i, err = 0; | |
206 | ||
207 | for (i = 0; i < 2; i++) { | |
208 | data->pwm[i] = pdata->pwm[i]; | |
209 | data->psc[i] = pdata->psc[i]; | |
210 | i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i), | |
211 | data->pwm[i]); | |
212 | i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i), | |
213 | data->psc[i]); | |
214 | } | |
215 | ||
216 | for (i = 0; i < 16; i++) { | |
217 | struct pca9532_led *led = &data->leds[i]; | |
218 | struct pca9532_led *pled = &pdata->leds[i]; | |
219 | led->client = client; | |
220 | led->id = i; | |
221 | led->type = pled->type; | |
222 | switch (led->type) { | |
223 | case PCA9532_TYPE_NONE: | |
224 | break; | |
225 | case PCA9532_TYPE_LED: | |
226 | led->state = pled->state; | |
85c5204a | 227 | led->name = pled->name; |
e14fa824 RV |
228 | led->ldev.name = led->name; |
229 | led->ldev.brightness = LED_OFF; | |
230 | led->ldev.brightness_set = pca9532_set_brightness; | |
231 | led->ldev.blink_set = pca9532_set_blink; | |
07172d2b | 232 | INIT_WORK(&led->work, pca9532_led_work); |
f785d022 SW |
233 | err = led_classdev_register(&client->dev, &led->ldev); |
234 | if (err < 0) { | |
e14fa824 RV |
235 | dev_err(&client->dev, |
236 | "couldn't register LED %s\n", | |
237 | led->name); | |
238 | goto exit; | |
239 | } | |
240 | pca9532_setled(led); | |
241 | break; | |
242 | case PCA9532_TYPE_N2100_BEEP: | |
243 | BUG_ON(data->idev); | |
244 | led->state = PCA9532_PWM1; | |
245 | pca9532_setled(led); | |
246 | data->idev = input_allocate_device(); | |
247 | if (data->idev == NULL) { | |
248 | err = -ENOMEM; | |
249 | goto exit; | |
250 | } | |
251 | data->idev->name = pled->name; | |
252 | data->idev->phys = "i2c/pca9532"; | |
253 | data->idev->id.bustype = BUS_HOST; | |
85c5204a | 254 | data->idev->id.vendor = 0x001f; |
e14fa824 RV |
255 | data->idev->id.product = 0x0001; |
256 | data->idev->id.version = 0x0100; | |
257 | data->idev->evbit[0] = BIT_MASK(EV_SND); | |
258 | data->idev->sndbit[0] = BIT_MASK(SND_BELL) | | |
259 | BIT_MASK(SND_TONE); | |
260 | data->idev->event = pca9532_event; | |
261 | input_set_drvdata(data->idev, data); | |
07172d2b | 262 | INIT_WORK(&data->work, pca9532_input_work); |
e14fa824 RV |
263 | err = input_register_device(data->idev); |
264 | if (err) { | |
265 | input_free_device(data->idev); | |
07172d2b | 266 | cancel_work_sync(&data->work); |
e14fa824 RV |
267 | data->idev = NULL; |
268 | goto exit; | |
269 | } | |
270 | break; | |
271 | } | |
272 | } | |
273 | return 0; | |
274 | ||
275 | exit: | |
276 | if (i > 0) | |
277 | for (i = i - 1; i >= 0; i--) | |
278 | switch (data->leds[i].type) { | |
279 | case PCA9532_TYPE_NONE: | |
280 | break; | |
281 | case PCA9532_TYPE_LED: | |
282 | led_classdev_unregister(&data->leds[i].ldev); | |
07172d2b | 283 | cancel_work_sync(&data->leds[i].work); |
e14fa824 RV |
284 | break; |
285 | case PCA9532_TYPE_N2100_BEEP: | |
286 | if (data->idev != NULL) { | |
287 | input_unregister_device(data->idev); | |
288 | input_free_device(data->idev); | |
07172d2b | 289 | cancel_work_sync(&data->work); |
e14fa824 RV |
290 | data->idev = NULL; |
291 | } | |
292 | break; | |
293 | } | |
294 | ||
295 | return err; | |
e14fa824 RV |
296 | } |
297 | ||
298 | static int pca9532_probe(struct i2c_client *client, | |
299 | const struct i2c_device_id *id) | |
300 | { | |
301 | struct pca9532_data *data = i2c_get_clientdata(client); | |
302 | struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data; | |
f785d022 SW |
303 | int err; |
304 | ||
305 | if (!pca9532_pdata) | |
306 | return -EIO; | |
e14fa824 RV |
307 | |
308 | if (!i2c_check_functionality(client->adapter, | |
309 | I2C_FUNC_SMBUS_BYTE_DATA)) | |
310 | return -EIO; | |
311 | ||
f785d022 | 312 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
e14fa824 RV |
313 | if (!data) |
314 | return -ENOMEM; | |
315 | ||
316 | dev_info(&client->dev, "setting platform data\n"); | |
317 | i2c_set_clientdata(client, data); | |
318 | data->client = client; | |
319 | mutex_init(&data->update_lock); | |
320 | ||
f785d022 SW |
321 | err = pca9532_configure(client, data, pca9532_pdata); |
322 | if (err) { | |
323 | kfree(data); | |
324 | i2c_set_clientdata(client, NULL); | |
325 | } | |
e14fa824 | 326 | |
f785d022 | 327 | return err; |
e14fa824 RV |
328 | } |
329 | ||
330 | static int pca9532_remove(struct i2c_client *client) | |
331 | { | |
332 | struct pca9532_data *data = i2c_get_clientdata(client); | |
333 | int i; | |
334 | for (i = 0; i < 16; i++) | |
335 | switch (data->leds[i].type) { | |
336 | case PCA9532_TYPE_NONE: | |
337 | break; | |
338 | case PCA9532_TYPE_LED: | |
339 | led_classdev_unregister(&data->leds[i].ldev); | |
07172d2b | 340 | cancel_work_sync(&data->leds[i].work); |
e14fa824 RV |
341 | break; |
342 | case PCA9532_TYPE_N2100_BEEP: | |
343 | if (data->idev != NULL) { | |
344 | input_unregister_device(data->idev); | |
345 | input_free_device(data->idev); | |
07172d2b | 346 | cancel_work_sync(&data->work); |
e14fa824 RV |
347 | data->idev = NULL; |
348 | } | |
349 | break; | |
350 | } | |
351 | ||
352 | kfree(data); | |
353 | i2c_set_clientdata(client, NULL); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static int __init pca9532_init(void) | |
358 | { | |
359 | return i2c_add_driver(&pca9532_driver); | |
360 | } | |
361 | ||
362 | static void __exit pca9532_exit(void) | |
363 | { | |
364 | i2c_del_driver(&pca9532_driver); | |
365 | } | |
366 | ||
b26e0ed4 | 367 | MODULE_AUTHOR("Riku Voipio"); |
e14fa824 RV |
368 | MODULE_LICENSE("GPL"); |
369 | MODULE_DESCRIPTION("PCA 9532 LED dimmer"); | |
370 | ||
371 | module_init(pca9532_init); | |
372 | module_exit(pca9532_exit); | |
373 |