2 * LEDs driver for Freescale MC13783
4 * Copyright (C) 2010 Philippe Rétornaz
6 * Based on leds-da903x:
7 * Copyright (C) 2008 Compulab, Ltd.
8 * Mike Rapoport <mike@compulab.co.il>
10 * Copyright (C) 2006-2008 Marvell International Ltd.
11 * Eric Miao <eric.miao@marvell.com>
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.
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/mc13783.h>
25 #include <linux/slab.h>
28 struct led_classdev cdev;
29 struct work_struct work;
30 struct mc13783 *master;
31 enum led_brightness new_brightness;
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
46 #define MC13783_REG_LED_CONTROL_1 52
47 #define MC13783_LED_C1_TC1HALF_BIT (1 << 18)
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
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
63 #define MC13783_REG_LED_CONTROL_4 55
64 #define MC13783_REG_LED_CONTROL_5 56
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
72 static void mc13783_led_work(struct work_struct *work)
74 struct mc13783_led *led = container_of(work, struct mc13783_led, work);
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;
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;
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;
105 off = led->id - MC13783_LED_R1;
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;
114 mc13783_lock(led->master);
116 mc13783_reg_rmw(led->master, reg, mask, value);
118 mc13783_unlock(led->master);
121 static void mc13783_led_set(struct led_classdev *led_cdev,
122 enum led_brightness value)
124 struct mc13783_led *led;
126 led = container_of(led_cdev, struct mc13783_led, cdev);
127 led->new_brightness = value;
128 schedule_work(&led->work);
131 static int __devinit mc13783_led_setup(struct mc13783_led *led, int max_current)
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;
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;
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;
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;
175 mc13783_lock(led->master);
177 ret = mc13783_reg_rmw(led->master, reg, mask << shift,
180 mc13783_unlock(led->master);
184 static int __devinit mc13783_leds_prepare(struct platform_device *pdev)
186 struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
187 struct mc13783 *dev = dev_get_drvdata(pdev->dev.parent);
193 if (pdata->flags & MC13783_LED_TC1HALF)
194 reg |= MC13783_LED_C1_TC1HALF_BIT;
196 if (pdata->flags & MC13783_LED_SLEWLIMTC)
197 reg |= MC13783_LED_Cx_SLEWLIM_BIT;
199 ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_1, reg);
203 reg = (pdata->bl_period & MC13783_LED_Cx_PERIOD_MASK) <<
204 MC13783_LED_Cx_PERIOD;
206 if (pdata->flags & MC13783_LED_SLEWLIMBL)
207 reg |= MC13783_LED_Cx_SLEWLIM_BIT;
209 ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_2, reg);
213 reg = (pdata->tc1_period & MC13783_LED_Cx_PERIOD_MASK) <<
214 MC13783_LED_Cx_PERIOD;
216 if (pdata->flags & MC13783_LED_TRIODE_TC1)
217 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
219 ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_3, reg);
223 reg = (pdata->tc2_period & MC13783_LED_Cx_PERIOD_MASK) <<
224 MC13783_LED_Cx_PERIOD;
226 if (pdata->flags & MC13783_LED_TRIODE_TC2)
227 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
229 ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_4, reg);
233 reg = (pdata->tc3_period & MC13783_LED_Cx_PERIOD_MASK) <<
234 MC13783_LED_Cx_PERIOD;
236 if (pdata->flags & MC13783_LED_TRIODE_TC3)
237 reg |= MC13783_LED_Cx_TRIODE_TC_BIT;
239 ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_5, reg);
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;
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;
258 ret = mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_0, reg);
265 static int __devinit mc13783_led_probe(struct platform_device *pdev)
267 struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
268 struct mc13783_led_platform_data *led_cur;
269 struct mc13783_led *led, *led_dat;
274 dev_err(&pdev->dev, "missing platform data\n");
278 if (pdata->num_leds < 1 || pdata->num_leds > MC13783_LED_MAX) {
279 dev_err(&pdev->dev, "Invalid led count %d\n", pdata->num_leds);
283 led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);
285 dev_err(&pdev->dev, "failed to alloc memory\n");
289 ret = mc13783_leds_prepare(pdev);
291 dev_err(&pdev->dev, "unable to init led driver\n");
295 for (i = 0; i < pdata->num_leds; i++) {
297 led_cur = &pdata->led[i];
299 if (led_cur->id > MC13783_LED_MAX || led_cur->id < 0) {
300 dev_err(&pdev->dev, "invalid id %d\n", led_cur->id);
305 if (init_led & (1 << led_cur->id)) {
306 dev_err(&pdev->dev, "led %d already initialized\n",
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);
320 INIT_WORK(&led_dat->work, mc13783_led_work);
322 ret = led_classdev_register(pdev->dev.parent, &led_dat->cdev);
324 dev_err(&pdev->dev, "failed to register led %d\n",
329 ret = mc13783_led_setup(led_dat, led_cur->max_current);
331 dev_err(&pdev->dev, "unable to init led %d\n",
338 platform_set_drvdata(pdev, led);
342 for (i = i - 1; i >= 0; i--) {
343 led_classdev_unregister(&led[i].cdev);
344 cancel_work_sync(&led[i].work);
352 static int __devexit mc13783_led_remove(struct platform_device *pdev)
354 struct mc13783_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
355 struct mc13783_led *led = platform_get_drvdata(pdev);
356 struct mc13783 *dev = dev_get_drvdata(pdev->dev.parent);
359 for (i = 0; i < pdata->num_leds; i++) {
360 led_classdev_unregister(&led[i].cdev);
361 cancel_work_sync(&led[i].work);
366 mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_0, 0);
367 mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_1, 0);
368 mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_2, 0);
369 mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_3, 0);
370 mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_4, 0);
371 mc13783_reg_write(dev, MC13783_REG_LED_CONTROL_5, 0);
379 static struct platform_driver mc13783_led_driver = {
381 .name = "mc13783-led",
382 .owner = THIS_MODULE,
384 .probe = mc13783_led_probe,
385 .remove = __devexit_p(mc13783_led_remove),
388 static int __init mc13783_led_init(void)
390 return platform_driver_register(&mc13783_led_driver);
392 module_init(mc13783_led_init);
394 static void __exit mc13783_led_exit(void)
396 platform_driver_unregister(&mc13783_led_driver);
398 module_exit(mc13783_led_exit);
400 MODULE_DESCRIPTION("LEDs driver for Freescale MC13783 PMIC");
401 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
402 MODULE_LICENSE("GPL");
403 MODULE_ALIAS("platform:mc13783-led");