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[pohmelfs.git] / drivers / leds / leds-mc13783.c
blob8bc4915415509d6e2456a0d4ea46446bf9188eca
1 /*
2 * LEDs driver for Freescale MC13783
3 *
4 * Copyright (C) 2010 Philippe Rétornaz
5 *
6 * Based on leds-da903x:
7 * Copyright (C) 2008 Compulab, Ltd.
8 * Mike Rapoport <mike@compulab.co.il>
9 *
10 * Copyright (C) 2006-2008 Marvell International Ltd.
11 * Eric Miao <eric.miao@marvell.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/leds.h>
23 #include <linux/workqueue.h>
24 #include <linux/mfd/mc13xxx.h>
25 #include <linux/slab.h>
26
27 struct mc13783_led {
28 struct led_classdev cdev;
29 struct work_struct work;
30 struct mc13xxx *master;
31 enum led_brightness new_brightness;
32 int id;
33 };
34
35 #define MC13783_REG_LED_CONTROL_0 51
36 #define MC13783_LED_C0_ENABLE_BIT (1 << 0)
37 #define MC13783_LED_C0_TRIODE_MD_BIT (1 << 7)
38 #define MC13783_LED_C0_TRIODE_AD_BIT (1 << 8)
39 #define MC13783_LED_C0_TRIODE_KP_BIT (1 << 9)
40 #define MC13783_LED_C0_BOOST_BIT (1 << 10)
41 #define MC13783_LED_C0_ABMODE_MASK 0x7
42 #define MC13783_LED_C0_ABMODE 11
43 #define MC13783_LED_C0_ABREF_MASK 0x3
44 #define MC13783_LED_C0_ABREF 14
45
46 #define MC13783_REG_LED_CONTROL_1 52
47 #define MC13783_LED_C1_TC1HALF_BIT (1 << 18)
48
49 #define MC13783_REG_LED_CONTROL_2 53
50 #define MC13783_LED_C2_BL_P_MASK 0xf
51 #define MC13783_LED_C2_MD_P 9
52 #define MC13783_LED_C2_AD_P 13
53 #define MC13783_LED_C2_KP_P 17
54 #define MC13783_LED_C2_BL_C_MASK 0x7
55 #define MC13783_LED_C2_MD_C 0
56 #define MC13783_LED_C2_AD_C 3
57 #define MC13783_LED_C2_KP_C 6
58
59 #define MC13783_REG_LED_CONTROL_3 54
60 #define MC13783_LED_C3_TC_P 6
61 #define MC13783_LED_C3_TC_P_MASK 0x1f
62
63 #define MC13783_REG_LED_CONTROL_4 55
64 #define MC13783_REG_LED_CONTROL_5 56
65
66 #define MC13783_LED_Cx_PERIOD 21
67 #define MC13783_LED_Cx_PERIOD_MASK 0x3
68 #define MC13783_LED_Cx_SLEWLIM_BIT (1 << 23)
69 #define MC13783_LED_Cx_TRIODE_TC_BIT (1 << 23)
70 #define MC13783_LED_Cx_TC_C_MASK 0x3
71
72 static void mc13783_led_work(struct work_struct *work)
73 {
74 struct mc13783_led *led = container_of(work, struct mc13783_led, work);
75 int reg = 0;
76 int mask = 0;
77 int value = 0;
78 int bank, off, shift;
79
80 switch (led->id) {
81 case MC13783_LED_MD:
82 reg = MC13783_REG_LED_CONTROL_2;
83 mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_MD_P;
84 value = (led->new_brightness >> 4) << MC13783_LED_C2_MD_P;
85 break;
86 case MC13783_LED_AD:
87 reg = MC13783_REG_LED_CONTROL_2;
88 mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_AD_P;
89 value = (led->new_brightness >> 4) << MC13783_LED_C2_AD_P;
90 break;
91 case MC13783_LED_KP:
92 reg = MC13783_REG_LED_CONTROL_2;
93 mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_KP_P;
94 value = (led->new_brightness >> 4) << MC13783_LED_C2_KP_P;
95 break;
96 case MC13783_LED_R1:
97 case MC13783_LED_G1:
98 case MC13783_LED_B1:
99 case MC13783_LED_R2:
100 case MC13783_LED_G2:
101 case MC13783_LED_B2:
102 case MC13783_LED_R3:
103 case MC13783_LED_G3:
104 case MC13783_LED_B3:
105 off = led->id - MC13783_LED_R1;
106 bank = off/3;
107 reg = MC13783_REG_LED_CONTROL_3 + off/3;
108 shift = (off - bank * 3) * 5 + MC13783_LED_C3_TC_P;
109 value = (led->new_brightness >> 3) << shift;
110 mask = MC13783_LED_C3_TC_P_MASK << shift;
111 break;
112 }
113
114 mc13xxx_lock(led->master);
115
116 mc13xxx_reg_rmw(led->master, reg, mask, value);
117
118 mc13xxx_unlock(led->master);
119 }
120
121 static void mc13783_led_set(struct led_classdev *led_cdev,
122 enum led_brightness value)
123 {
124 struct mc13783_led *led;
125
126 led = container_of(led_cdev, struct mc13783_led, cdev);
127 led->new_brightness = value;
128 schedule_work(&led->work);
129 }
130
131 static int __devinit mc13783_led_setup(struct mc13783_led *led, int max_current)
132 {
133 int shift = 0;
134 int mask = 0;
135 int value = 0;
136 int reg = 0;
137 int ret, bank;
138
139 switch (led->id) {
140 case MC13783_LED_MD:
141 shift = MC13783_LED_C2_MD_C;
142 mask = MC13783_LED_C2_BL_C_MASK;
143 value = max_current & MC13783_LED_C2_BL_C_MASK;
144 reg = MC13783_REG_LED_CONTROL_2;
145 break;
146 case MC13783_LED_AD:
147 shift = MC13783_LED_C2_AD_C;
148 mask = MC13783_LED_C2_BL_C_MASK;
149 value = max_current & MC13783_LED_C2_BL_C_MASK;
150 reg = MC13783_REG_LED_CONTROL_2;
151 break;
152 case MC13783_LED_KP:
153 shift = MC13783_LED_C2_KP_C;
154 mask = MC13783_LED_C2_BL_C_MASK;
155 value = max_current & MC13783_LED_C2_BL_C_MASK;
156 reg = MC13783_REG_LED_CONTROL_2;
157 break;
158 case MC13783_LED_R1:
159 case MC13783_LED_G1:
160 case MC13783_LED_B1:
161 case MC13783_LED_R2:
162 case MC13783_LED_G2:
163 case MC13783_LED_B2:
164 case MC13783_LED_R3:
165 case MC13783_LED_G3:
166 case MC13783_LED_B3:
167 bank = (led->id - MC13783_LED_R1)/3;
168 reg = MC13783_REG_LED_CONTROL_3 + bank;
169 shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2;
170 mask = MC13783_LED_Cx_TC_C_MASK;
171 value = max_current & MC13783_LED_Cx_TC_C_MASK;
172 break;
173 }
174
175 mc13xxx_lock(led->master);
176
177 ret = mc13xxx_reg_rmw(led->master, reg, mask << shift,
178 value << shift);
179
180 mc13xxx_unlock(led->master);
181 return ret;
182 }
183
184 static int __devinit mc13783_leds_prepare(struct platform_device *pdev)
185 {
186 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
187 struct mc13xxx *dev = dev_get_drvdata(pdev->dev.parent);
188 int ret = 0;
189 int reg = 0;
190
191 mc13xxx_lock(dev);
192
193 if (pdata->flags & MC13783_LED_TC1HALF)
194 reg |= MC13783_LED_C1_TC1HALF_BIT;
195
196 if (pdata->flags & MC13783_LED_SLEWLIMTC)
197 reg |= MC13783_LED_Cx_SLEWLIM_BIT;
198
199 ret = mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_1, reg);
200 if (ret)
201 goto out;
202
203 reg = (pdata->bl_period & MC13783_LED_Cx_PERIOD_MASK) <<
204 MC13783_LED_Cx_PERIOD;
205
206 if (pdata->flags & MC13783_LED_SLEWLIMBL)
207 reg |= MC13783_LED_Cx_SLEWLIM_BIT;
208
209 ret = mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_2, reg);
210 if (ret)
211 goto out;
212
213 reg = (pdata->tc1_period & MC13783_LED_Cx_PERIOD_MASK) <<
214 MC13783_LED_Cx_PERIOD;
215
216 if (pdata->flags & MC13783_LED_TRIODE_TC1)
217 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
218
219 ret = mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_3, reg);
220 if (ret)
221 goto out;
222
223 reg = (pdata->tc2_period & MC13783_LED_Cx_PERIOD_MASK) <<
224 MC13783_LED_Cx_PERIOD;
225
226 if (pdata->flags & MC13783_LED_TRIODE_TC2)
227 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
228
229 ret = mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_4, reg);
230 if (ret)
231 goto out;
232
233 reg = (pdata->tc3_period & MC13783_LED_Cx_PERIOD_MASK) <<
234 MC13783_LED_Cx_PERIOD;
235
236 if (pdata->flags & MC13783_LED_TRIODE_TC3)
237 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
238
239 ret = mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_5, reg);
240 if (ret)
241 goto out;
242
243 reg = MC13783_LED_C0_ENABLE_BIT;
244 if (pdata->flags & MC13783_LED_TRIODE_MD)
245 reg |= MC13783_LED_C0_TRIODE_MD_BIT;
246 if (pdata->flags & MC13783_LED_TRIODE_AD)
247 reg |= MC13783_LED_C0_TRIODE_AD_BIT;
248 if (pdata->flags & MC13783_LED_TRIODE_KP)
249 reg |= MC13783_LED_C0_TRIODE_KP_BIT;
250 if (pdata->flags & MC13783_LED_BOOST_EN)
251 reg |= MC13783_LED_C0_BOOST_BIT;
252
253 reg |= (pdata->abmode & MC13783_LED_C0_ABMODE_MASK) <<
254 MC13783_LED_C0_ABMODE;
255 reg |= (pdata->abref & MC13783_LED_C0_ABREF_MASK) <<
256 MC13783_LED_C0_ABREF;
257
258 ret = mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_0, reg);
259
260 out:
261 mc13xxx_unlock(dev);
262 return ret;
263 }
264
265 static int __devinit mc13783_led_probe(struct platform_device *pdev)
266 {
267 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
268 struct mc13xxx_led_platform_data *led_cur;
269 struct mc13783_led *led, *led_dat;
270 int ret, i;
271 int init_led = 0;
272
273 if (pdata == NULL) {
274 dev_err(&pdev->dev, "missing platform data\n");
275 return -ENODEV;
276 }
277
278 if (pdata->num_leds < 1 || pdata->num_leds > (MC13783_LED_MAX + 1)) {
279 dev_err(&pdev->dev, "Invalid led count %d\n", pdata->num_leds);
280 return -EINVAL;
281 }
282
283 led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);
284 if (led == NULL) {
285 dev_err(&pdev->dev, "failed to alloc memory\n");
286 return -ENOMEM;
287 }
288
289 ret = mc13783_leds_prepare(pdev);
290 if (ret) {
291 dev_err(&pdev->dev, "unable to init led driver\n");
292 goto err_free;
293 }
294
295 for (i = 0; i < pdata->num_leds; i++) {
296 led_dat = &led[i];
297 led_cur = &pdata->led[i];
298
299 if (led_cur->id > MC13783_LED_MAX || led_cur->id < 0) {
300 dev_err(&pdev->dev, "invalid id %d\n", led_cur->id);
301 ret = -EINVAL;
302 goto err_register;
303 }
304
305 if (init_led & (1 << led_cur->id)) {
306 dev_err(&pdev->dev, "led %d already initialized\n",
307 led_cur->id);
308 ret = -EINVAL;
309 goto err_register;
310 }
311
312 init_led |= 1 << led_cur->id;
313 led_dat->cdev.name = led_cur->name;
314 led_dat->cdev.default_trigger = led_cur->default_trigger;
315 led_dat->cdev.brightness_set = mc13783_led_set;
316 led_dat->cdev.brightness = LED_OFF;
317 led_dat->id = led_cur->id;
318 led_dat->master = dev_get_drvdata(pdev->dev.parent);
319
320 INIT_WORK(&led_dat->work, mc13783_led_work);
321
322 ret = led_classdev_register(pdev->dev.parent, &led_dat->cdev);
323 if (ret) {
324 dev_err(&pdev->dev, "failed to register led %d\n",
325 led_dat->id);
326 goto err_register;
327 }
328
329 ret = mc13783_led_setup(led_dat, led_cur->max_current);
330 if (ret) {
331 dev_err(&pdev->dev, "unable to init led %d\n",
332 led_dat->id);
333 i++;
334 goto err_register;
335 }
336 }
337
338 platform_set_drvdata(pdev, led);
339 return 0;
340
341 err_register:
342 for (i = i - 1; i >= 0; i--) {
343 led_classdev_unregister(&led[i].cdev);
344 cancel_work_sync(&led[i].work);
345 }
346
347 err_free:
348 kfree(led);
349 return ret;
350 }
351
352 static int __devexit mc13783_led_remove(struct platform_device *pdev)
353 {
354 struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
355 struct mc13783_led *led = platform_get_drvdata(pdev);
356 struct mc13xxx *dev = dev_get_drvdata(pdev->dev.parent);
357 int i;
358
359 for (i = 0; i < pdata->num_leds; i++) {
360 led_classdev_unregister(&led[i].cdev);
361 cancel_work_sync(&led[i].work);
362 }
363
364 mc13xxx_lock(dev);
365
366 mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_0, 0);
367 mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_1, 0);
368 mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_2, 0);
369 mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_3, 0);
370 mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_4, 0);
371 mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_5, 0);
372
373 mc13xxx_unlock(dev);
374
375 kfree(led);
376 return 0;
377 }
378
379 static struct platform_driver mc13783_led_driver = {
380 .driver = {
381 .name = "mc13783-led",
382 .owner = THIS_MODULE,
383 },
384 .probe = mc13783_led_probe,
385 .remove = __devexit_p(mc13783_led_remove),
386 };
387
388 module_platform_driver(mc13783_led_driver);
389
390 MODULE_DESCRIPTION("LEDs driver for Freescale MC13783 PMIC");
391 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
392 MODULE_LICENSE("GPL");
393 MODULE_ALIAS("platform:mc13783-led");