leds-mc13783.c revision 9d263813c27e2ad3da7ea0877e623f4ff8767ddd 
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
26#define MC13XXX_REG_LED_CONTROL(x)	(51 + (x))
27
28struct mc13xxx_led_devtype {
29	int	led_min;
30	int	led_max;
31	int	num_regs;
32};
33
34struct mc13xxx_led {
35	struct led_classdev	cdev;
36	struct work_struct	work;
37	struct mc13xxx		*master;
38	enum led_brightness	new_brightness;
39	int			id;
40};
41
42struct mc13xxx_leds {
43	struct mc13xxx_led_devtype	*devtype;
44	int				num_leds;
45	struct mc13xxx_led		led[0];
46};
47
48static void mc13xxx_led_work(struct work_struct *work)
49{
50	struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
51	int reg, mask, value, bank, off, shift;
52
53	switch (led->id) {
54	case MC13783_LED_MD:
55		reg = MC13XXX_REG_LED_CONTROL(2);
56		shift = 9;
57		mask = 0x0f;
58		value = led->new_brightness >> 4;
59		break;
60	case MC13783_LED_AD:
61		reg = MC13XXX_REG_LED_CONTROL(2);
62		shift = 13;
63		mask = 0x0f;
64		value = led->new_brightness >> 4;
65		break;
66	case MC13783_LED_KP:
67		reg = MC13XXX_REG_LED_CONTROL(2);
68		shift = 17;
69		mask = 0x0f;
70		value = led->new_brightness >> 4;
71		break;
72	case MC13783_LED_R1:
73	case MC13783_LED_G1:
74	case MC13783_LED_B1:
75	case MC13783_LED_R2:
76	case MC13783_LED_G2:
77	case MC13783_LED_B2:
78	case MC13783_LED_R3:
79	case MC13783_LED_G3:
80	case MC13783_LED_B3:
81		off = led->id - MC13783_LED_R1;
82		bank = off / 3;
83		reg = MC13XXX_REG_LED_CONTROL(3) + bank;
84		shift = (off - bank * 3) * 5 + 6;
85		value = led->new_brightness >> 3;
86		mask = 0x1f;
87		break;
88	default:
89		BUG();
90	}
91
92	mc13xxx_lock(led->master);
93	mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift);
94	mc13xxx_unlock(led->master);
95}
96
97static void mc13xxx_led_set(struct led_classdev *led_cdev,
98			    enum led_brightness value)
99{
100	struct mc13xxx_led *led =
101		container_of(led_cdev, struct mc13xxx_led, cdev);
102
103	led->new_brightness = value;
104	schedule_work(&led->work);
105}
106
107static int __init mc13xxx_led_setup(struct mc13xxx_led *led, int max_current)
108{
109	int shift, mask, reg, ret, bank;
110
111	switch (led->id) {
112	case MC13783_LED_MD:
113		reg = MC13XXX_REG_LED_CONTROL(2);
114		shift = 0;
115		mask = 0x07;
116		break;
117	case MC13783_LED_AD:
118		reg = MC13XXX_REG_LED_CONTROL(2);
119		shift = 3;
120		mask = 0x07;
121		break;
122	case MC13783_LED_KP:
123		reg = MC13XXX_REG_LED_CONTROL(2);
124		shift = 6;
125		mask = 0x07;
126		break;
127	case MC13783_LED_R1:
128	case MC13783_LED_G1:
129	case MC13783_LED_B1:
130	case MC13783_LED_R2:
131	case MC13783_LED_G2:
132	case MC13783_LED_B2:
133	case MC13783_LED_R3:
134	case MC13783_LED_G3:
135	case MC13783_LED_B3:
136		bank = (led->id - MC13783_LED_R1) / 3;
137		reg = MC13XXX_REG_LED_CONTROL(3) + bank;
138		shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2;
139		mask = 0x03;
140		break;
141	default:
142		BUG();
143	}
144
145	mc13xxx_lock(led->master);
146	ret = mc13xxx_reg_rmw(led->master, reg, mask << shift,
147			      max_current << shift);
148	mc13xxx_unlock(led->master);
149
150	return ret;
151}
152
153static int __init mc13xxx_led_probe(struct platform_device *pdev)
154{
155	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
156	struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
157	struct mc13xxx_led_devtype *devtype =
158		(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
159	struct mc13xxx_leds *leds;
160	int i, id, num_leds, ret;
161	u32 reg, init_led = 0;
162
163	if (!pdata) {
164		dev_err(&pdev->dev, "Missing platform data\n");
165		return -ENODEV;
166	}
167
168	num_leds = pdata->num_leds;
169
170	if ((num_leds < 1) ||
171	    (num_leds > (devtype->led_max - devtype->led_min + 1))) {
172		dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds);
173		return -EINVAL;
174	}
175
176	leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) +
177			    sizeof(struct mc13xxx_leds), GFP_KERNEL);
178	if (!leds)
179		return -ENOMEM;
180
181	leds->devtype = devtype;
182	leds->num_leds = num_leds;
183	platform_set_drvdata(pdev, leds);
184
185	mc13xxx_lock(mcdev);
186	for (i = 0; i < devtype->num_regs; i++) {
187		reg = pdata->led_control[i];
188		WARN_ON(reg >= (1 << 24));
189		ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg);
190		if (ret)
191			break;
192	}
193	mc13xxx_unlock(mcdev);
194
195	if (ret) {
196		dev_err(&pdev->dev, "Unable to init LED driver\n");
197		return ret;
198	}
199
200	for (i = 0; i < num_leds; i++) {
201		const char *name, *trig;
202		char max_current;
203
204		ret = -EINVAL;
205
206		id = pdata->led[i].id;
207		name = pdata->led[i].name;
208		trig = pdata->led[i].default_trigger;
209		max_current = pdata->led[i].max_current;
210
211		if ((id > devtype->led_max) || (id < devtype->led_min)) {
212			dev_err(&pdev->dev, "Invalid ID %i\n", id);
213			break;
214		}
215
216		if (init_led & (1 << id)) {
217			dev_warn(&pdev->dev,
218				 "LED %i already initialized\n", id);
219			break;
220		}
221
222		init_led |= 1 << id;
223		leds->led[i].id = id;
224		leds->led[i].master = mcdev;
225		leds->led[i].cdev.name = name;
226		leds->led[i].cdev.default_trigger = trig;
227		leds->led[i].cdev.brightness_set = mc13xxx_led_set;
228		leds->led[i].cdev.brightness = LED_OFF;
229
230		INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
231
232		ret = mc13xxx_led_setup(&leds->led[i], max_current);
233		if (ret) {
234			dev_err(&pdev->dev, "Unable to setup LED %i\n", id);
235			break;
236		}
237		ret = led_classdev_register(pdev->dev.parent,
238					    &leds->led[i].cdev);
239		if (ret) {
240			dev_err(&pdev->dev, "Failed to register LED %i\n", id);
241			break;
242		}
243	}
244
245	if (ret)
246		while (--i >= 0) {
247			led_classdev_unregister(&leds->led[i].cdev);
248			cancel_work_sync(&leds->led[i].work);
249		}
250
251	return ret;
252}
253
254static int mc13xxx_led_remove(struct platform_device *pdev)
255{
256	struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
257	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
258	int i;
259
260	for (i = 0; i < leds->num_leds; i++) {
261		led_classdev_unregister(&leds->led[i].cdev);
262		cancel_work_sync(&leds->led[i].work);
263	}
264
265	mc13xxx_lock(mcdev);
266	for (i = 0; i < leds->devtype->num_regs; i++)
267		mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0);
268	mc13xxx_unlock(mcdev);
269
270	return 0;
271}
272
273static const struct mc13xxx_led_devtype mc13783_led_devtype = {
274	.led_min	= MC13783_LED_MD,
275	.led_max	= MC13783_LED_B3,
276	.num_regs	= 6,
277};
278
279static const struct platform_device_id mc13xxx_led_id_table[] = {
280	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
281	{ }
282};
283MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
284
285static struct platform_driver mc13xxx_led_driver = {
286	.driver	= {
287		.name	= "mc13xxx-led",
288		.owner	= THIS_MODULE,
289	},
290	.remove		= mc13xxx_led_remove,
291	.id_table	= mc13xxx_led_id_table,
292};
293module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
294
295MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
296MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
297MODULE_LICENSE("GPL");
298