leds-mc13783.c revision 01a7a063e8cf4bc09af2c02d28c12f3d72bf9649 
1/*
2 * LEDs driver for Freescale MC13783/MC13892
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	case MC13892_LED_MD:
89		reg = MC13XXX_REG_LED_CONTROL(0);
90		shift = 3;
91		mask = 0x3f;
92		value = led->new_brightness >> 2;
93		break;
94	case MC13892_LED_AD:
95		reg = MC13XXX_REG_LED_CONTROL(0);
96		shift = 15;
97		mask = 0x3f;
98		value = led->new_brightness >> 2;
99		break;
100	case MC13892_LED_KP:
101		reg = MC13XXX_REG_LED_CONTROL(1);
102		shift = 3;
103		mask = 0x3f;
104		value = led->new_brightness >> 2;
105		break;
106	case MC13892_LED_R:
107	case MC13892_LED_G:
108	case MC13892_LED_B:
109		off = led->id - MC13892_LED_R;
110		bank = off / 2;
111		reg = MC13XXX_REG_LED_CONTROL(2) + bank;
112		shift = (off - bank * 2) * 12 + 3;
113		value = led->new_brightness >> 2;
114		mask = 0x3f;
115		break;
116	default:
117		BUG();
118	}
119
120	mc13xxx_lock(led->master);
121	mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift);
122	mc13xxx_unlock(led->master);
123}
124
125static void mc13xxx_led_set(struct led_classdev *led_cdev,
126			    enum led_brightness value)
127{
128	struct mc13xxx_led *led =
129		container_of(led_cdev, struct mc13xxx_led, cdev);
130
131	led->new_brightness = value;
132	schedule_work(&led->work);
133}
134
135static int __init mc13xxx_led_probe(struct platform_device *pdev)
136{
137	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
138	struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
139	struct mc13xxx_led_devtype *devtype =
140		(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
141	struct mc13xxx_leds *leds;
142	int i, id, num_leds, ret = -ENODATA;
143	u32 reg, init_led = 0;
144
145	if (!pdata) {
146		dev_err(&pdev->dev, "Missing platform data\n");
147		return -ENODEV;
148	}
149
150	num_leds = pdata->num_leds;
151
152	if ((num_leds < 1) ||
153	    (num_leds > (devtype->led_max - devtype->led_min + 1))) {
154		dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds);
155		return -EINVAL;
156	}
157
158	leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) +
159			    sizeof(struct mc13xxx_leds), GFP_KERNEL);
160	if (!leds)
161		return -ENOMEM;
162
163	leds->devtype = devtype;
164	leds->num_leds = num_leds;
165	platform_set_drvdata(pdev, leds);
166
167	mc13xxx_lock(mcdev);
168	for (i = 0; i < devtype->num_regs; i++) {
169		reg = pdata->led_control[i];
170		WARN_ON(reg >= (1 << 24));
171		ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg);
172		if (ret)
173			break;
174	}
175	mc13xxx_unlock(mcdev);
176
177	if (ret) {
178		dev_err(&pdev->dev, "Unable to init LED driver\n");
179		return ret;
180	}
181
182	for (i = 0; i < num_leds; i++) {
183		const char *name, *trig;
184
185		ret = -EINVAL;
186
187		id = pdata->led[i].id;
188		name = pdata->led[i].name;
189		trig = pdata->led[i].default_trigger;
190
191		if ((id > devtype->led_max) || (id < devtype->led_min)) {
192			dev_err(&pdev->dev, "Invalid ID %i\n", id);
193			break;
194		}
195
196		if (init_led & (1 << id)) {
197			dev_warn(&pdev->dev,
198				 "LED %i already initialized\n", id);
199			break;
200		}
201
202		init_led |= 1 << id;
203		leds->led[i].id = id;
204		leds->led[i].master = mcdev;
205		leds->led[i].cdev.name = name;
206		leds->led[i].cdev.default_trigger = trig;
207		leds->led[i].cdev.brightness_set = mc13xxx_led_set;
208		leds->led[i].cdev.brightness = LED_OFF;
209
210		INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
211
212		ret = led_classdev_register(pdev->dev.parent,
213					    &leds->led[i].cdev);
214		if (ret) {
215			dev_err(&pdev->dev, "Failed to register LED %i\n", id);
216			break;
217		}
218	}
219
220	if (ret)
221		while (--i >= 0) {
222			led_classdev_unregister(&leds->led[i].cdev);
223			cancel_work_sync(&leds->led[i].work);
224		}
225
226	return ret;
227}
228
229static int mc13xxx_led_remove(struct platform_device *pdev)
230{
231	struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
232	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
233	int i;
234
235	for (i = 0; i < leds->num_leds; i++) {
236		led_classdev_unregister(&leds->led[i].cdev);
237		cancel_work_sync(&leds->led[i].work);
238	}
239
240	mc13xxx_lock(mcdev);
241	for (i = 0; i < leds->devtype->num_regs; i++)
242		mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0);
243	mc13xxx_unlock(mcdev);
244
245	return 0;
246}
247
248static const struct mc13xxx_led_devtype mc13783_led_devtype = {
249	.led_min	= MC13783_LED_MD,
250	.led_max	= MC13783_LED_B3,
251	.num_regs	= 6,
252};
253
254static const struct mc13xxx_led_devtype mc13892_led_devtype = {
255	.led_min	= MC13892_LED_MD,
256	.led_max	= MC13892_LED_B,
257	.num_regs	= 4,
258};
259
260static const struct platform_device_id mc13xxx_led_id_table[] = {
261	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
262	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
263	{ }
264};
265MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
266
267static struct platform_driver mc13xxx_led_driver = {
268	.driver	= {
269		.name	= "mc13xxx-led",
270		.owner	= THIS_MODULE,
271	},
272	.remove		= mc13xxx_led_remove,
273	.id_table	= mc13xxx_led_id_table,
274};
275module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
276
277MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
278MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
279MODULE_LICENSE("GPL");
280