Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
leds-mc13783.c
Go to the documentation of this file.
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 <[email protected]>
9  *
10  * Copyright (C) 2006-2008 Marvell International Ltd.
11  * Eric Miao <[email protected]>
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 = devm_kzalloc(&pdev->dev, pdata->num_leds * sizeof(*led),
284  GFP_KERNEL);
285  if (led == NULL) {
286  dev_err(&pdev->dev, "failed to alloc memory\n");
287  return -ENOMEM;
288  }
289 
290  ret = mc13783_leds_prepare(pdev);
291  if (ret) {
292  dev_err(&pdev->dev, "unable to init led driver\n");
293  return ret;
294  }
295 
296  for (i = 0; i < pdata->num_leds; i++) {
297  led_dat = &led[i];
298  led_cur = &pdata->led[i];
299 
300  if (led_cur->id > MC13783_LED_MAX || led_cur->id < 0) {
301  dev_err(&pdev->dev, "invalid id %d\n", led_cur->id);
302  ret = -EINVAL;
303  goto err_register;
304  }
305 
306  if (init_led & (1 << led_cur->id)) {
307  dev_err(&pdev->dev, "led %d already initialized\n",
308  led_cur->id);
309  ret = -EINVAL;
310  goto err_register;
311  }
312 
313  init_led |= 1 << led_cur->id;
314  led_dat->cdev.name = led_cur->name;
315  led_dat->cdev.default_trigger = led_cur->default_trigger;
316  led_dat->cdev.brightness_set = mc13783_led_set;
317  led_dat->cdev.brightness = LED_OFF;
318  led_dat->id = led_cur->id;
319  led_dat->master = dev_get_drvdata(pdev->dev.parent);
320 
321  INIT_WORK(&led_dat->work, mc13783_led_work);
322 
323  ret = led_classdev_register(pdev->dev.parent, &led_dat->cdev);
324  if (ret) {
325  dev_err(&pdev->dev, "failed to register led %d\n",
326  led_dat->id);
327  goto err_register;
328  }
329 
330  ret = mc13783_led_setup(led_dat, led_cur->max_current);
331  if (ret) {
332  dev_err(&pdev->dev, "unable to init led %d\n",
333  led_dat->id);
334  i++;
335  goto err_register;
336  }
337  }
338 
339  platform_set_drvdata(pdev, led);
340  return 0;
341 
342 err_register:
343  for (i = i - 1; i >= 0; i--) {
344  led_classdev_unregister(&led[i].cdev);
345  cancel_work_sync(&led[i].work);
346  }
347 
348  return ret;
349 }
350 
351 static int __devexit mc13783_led_remove(struct platform_device *pdev)
352 {
353  struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
354  struct mc13783_led *led = platform_get_drvdata(pdev);
355  struct mc13xxx *dev = dev_get_drvdata(pdev->dev.parent);
356  int i;
357 
358  for (i = 0; i < pdata->num_leds; i++) {
359  led_classdev_unregister(&led[i].cdev);
360  cancel_work_sync(&led[i].work);
361  }
362 
363  mc13xxx_lock(dev);
364 
365  mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_0, 0);
366  mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_1, 0);
367  mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_2, 0);
368  mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_3, 0);
369  mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_4, 0);
370  mc13xxx_reg_write(dev, MC13783_REG_LED_CONTROL_5, 0);
371 
372  mc13xxx_unlock(dev);
373 
374  platform_set_drvdata(pdev, NULL);
375  return 0;
376 }
377 
378 static struct platform_driver mc13783_led_driver = {
379  .driver = {
380  .name = "mc13783-led",
381  .owner = THIS_MODULE,
382  },
383  .probe = mc13783_led_probe,
384  .remove = __devexit_p(mc13783_led_remove),
385 };
386 
387 module_platform_driver(mc13783_led_driver);
388 
389 MODULE_DESCRIPTION("LEDs driver for Freescale MC13783 PMIC");
390 MODULE_AUTHOR("Philippe Retornaz <[email protected]>");
391 MODULE_LICENSE("GPL");
392 MODULE_ALIAS("platform:mc13783-led");
Generated on Thu Jan 10 2013 13:43:01 for Linux Kernel by   doxygen 1.8.2