Root/drivers/leds/leds-mc13783.c

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
27struct 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
72static 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
121static 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
131static int 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
184static int 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
260out:
261    mc13xxx_unlock(dev);
262    return ret;
263}
264
265static int 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
342err_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
351static int 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
378static struct platform_driver mc13783_led_driver = {
379    .driver = {
380        .name = "mc13783-led",
381        .owner = THIS_MODULE,
382    },
383    .probe = mc13783_led_probe,
384    .remove = mc13783_led_remove,
385};
386
387module_platform_driver(mc13783_led_driver);
388
389MODULE_DESCRIPTION("LEDs driver for Freescale MC13783 PMIC");
390MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
391MODULE_LICENSE("GPL");
392MODULE_ALIAS("platform:mc13783-led");
393

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