aboutsummaryrefslogtreecommitdiff
path: root/drivers/leds/leds-mc13783.c
blob: 2421cf1049915a6ef52fa55d31b30d0c2e88f406 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/*
 * LEDs driver for Freescale MC13783/MC13892/MC34708
 *
 * Copyright (C) 2010 Philippe Rétornaz
 *
 * Based on leds-da903x:
 * Copyright (C) 2008 Compulab, Ltd.
 *      Mike Rapoport <mike@compulab.co.il>
 *
 * Copyright (C) 2006-2008 Marvell International Ltd.
 *      Eric Miao <eric.miao@marvell.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/of.h>
#include <linux/mfd/mc13xxx.h>

struct mc13xxx_led_devtype {
	int	led_min;
	int	led_max;
	int	num_regs;
	u32	ledctrl_base;
};

struct mc13xxx_led {
	struct led_classdev	cdev;
	int			id;
	struct mc13xxx_leds	*leds;
};

struct mc13xxx_leds {
	struct mc13xxx			*master;
	struct mc13xxx_led_devtype	*devtype;
	int				num_leds;
	struct mc13xxx_led		*led;
};

static unsigned int mc13xxx_max_brightness(int id)
{
	if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
		return 0x0f;
	else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
		return 0x1f;

	return 0x3f;
}

static int mc13xxx_led_set(struct led_classdev *led_cdev,
			    enum led_brightness value)
{
	struct mc13xxx_led *led =
		container_of(led_cdev, struct mc13xxx_led, cdev);
	struct mc13xxx_leds *leds = led->leds;
	unsigned int reg, bank, off, shift;

	switch (led->id) {
	case MC13783_LED_MD:
	case MC13783_LED_AD:
	case MC13783_LED_KP:
		reg = 2;
		shift = 9 + (led->id - MC13783_LED_MD) * 4;
		break;
	case MC13783_LED_R1:
	case MC13783_LED_G1:
	case MC13783_LED_B1:
	case MC13783_LED_R2:
	case MC13783_LED_G2:
	case MC13783_LED_B2:
	case MC13783_LED_R3:
	case MC13783_LED_G3:
	case MC13783_LED_B3:
		off = led->id - MC13783_LED_R1;
		bank = off / 3;
		reg = 3 + bank;
		shift = (off - bank * 3) * 5 + 6;
		break;
	case MC13892_LED_MD:
	case MC13892_LED_AD:
	case MC13892_LED_KP:
		off = led->id - MC13892_LED_MD;
		reg = off / 2;
		shift = 3 + (off - reg * 2) * 12;
		break;
	case MC13892_LED_R:
	case MC13892_LED_G:
	case MC13892_LED_B:
		off = led->id - MC13892_LED_R;
		bank = off / 2;
		reg = 2 + bank;
		shift = (off - bank * 2) * 12 + 3;
		break;
	case MC34708_LED_R:
	case MC34708_LED_G:
		reg = 0;
		shift = 3 + (led->id - MC34708_LED_R) * 12;
		break;
	default:
		BUG();
	}

	return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
			mc13xxx_max_brightness(led->id) << shift,
			value << shift);
}

#ifdef CONFIG_OF
static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
	struct platform_device *pdev)
{
	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
	struct mc13xxx_leds_platform_data *pdata;
	struct device_node *parent, *child;
	struct device *dev = &pdev->dev;
	int i = 0, ret = -ENODATA;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	parent = of_get_child_by_name(dev->parent->of_node, "leds");
	if (!parent)
		goto out_node_put;

	ret = of_property_read_u32_array(parent, "led-control",
					 pdata->led_control,
					 leds->devtype->num_regs);
	if (ret)
		goto out_node_put;

	pdata->num_leds = of_get_child_count(parent);

	pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
				  GFP_KERNEL);
	if (!pdata->led) {
		ret = -ENOMEM;
		goto out_node_put;
	}

	for_each_child_of_node(parent, child) {
		const char *str;
		u32 tmp;

		if (of_property_read_u32(child, "reg", &tmp))
			continue;
		pdata->led[i].id = leds->devtype->led_min + tmp;

		if (!of_property_read_string(child, "label", &str))
			pdata->led[i].name = str;
		if (!of_property_read_string(child, "linux,default-trigger",
					     &str))
			pdata->led[i].default_trigger = str;

		i++;
	}

	pdata->num_leds = i;
	ret = i > 0 ? 0 : -ENODATA;

out_node_put:
	of_node_put(parent);

	return ret ? ERR_PTR(ret) : pdata;
}
#else
static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
	struct platform_device *pdev)
{
	return ERR_PTR(-ENOSYS);
}
#endif

static int __init mc13xxx_led_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
	struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
	struct mc13xxx_led_devtype *devtype =
		(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
	struct mc13xxx_leds *leds;
	int i, id, ret = -ENODATA;
	u32 init_led = 0;

	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
	if (!leds)
		return -ENOMEM;

	leds->devtype = devtype;
	leds->master = mcdev;
	platform_set_drvdata(pdev, leds);

	if (dev->parent->of_node) {
		pdata = mc13xxx_led_probe_dt(pdev);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	} else if (!pdata)
		return -ENODATA;

	leds->num_leds = pdata->num_leds;

	if ((leds->num_leds < 1) ||
	    (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
		dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
		return -EINVAL;
	}

	leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
				 GFP_KERNEL);
	if (!leds->led)
		return -ENOMEM;

	for (i = 0; i < devtype->num_regs; i++) {
		ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
					pdata->led_control[i]);
		if (ret)
			return ret;
	}

	for (i = 0; i < leds->num_leds; i++) {
		const char *name, *trig;

		ret = -EINVAL;

		id = pdata->led[i].id;
		name = pdata->led[i].name;
		trig = pdata->led[i].default_trigger;

		if ((id > devtype->led_max) || (id < devtype->led_min)) {
			dev_err(dev, "Invalid ID %i\n", id);
			break;
		}

		if (init_led & (1 << id)) {
			dev_warn(dev, "LED %i already initialized\n", id);
			break;
		}

		init_led |= 1 << id;
		leds->led[i].id = id;
		leds->led[i].leds = leds;
		leds->led[i].cdev.name = name;
		leds->led[i].cdev.default_trigger = trig;
		leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
		leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
		leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);

		ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
		if (ret) {
			dev_err(dev, "Failed to register LED %i\n", id);
			break;
		}
	}

	if (ret)
		while (--i >= 0)
			led_classdev_unregister(&leds->led[i].cdev);

	return ret;
}

static int mc13xxx_led_remove(struct platform_device *pdev)
{
	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < leds->num_leds; i++)
		led_classdev_unregister(&leds->led[i].cdev);

	return 0;
}

static const struct mc13xxx_led_devtype mc13783_led_devtype = {
	.led_min	= MC13783_LED_MD,
	.led_max	= MC13783_LED_B3,
	.num_regs	= 6,
	.ledctrl_base	= 51,
};

static const struct mc13xxx_led_devtype mc13892_led_devtype = {
	.led_min	= MC13892_LED_MD,
	.led_max	= MC13892_LED_B,
	.num_regs	= 4,
	.ledctrl_base	= 51,
};

static const struct mc13xxx_led_devtype mc34708_led_devtype = {
	.led_min	= MC34708_LED_R,
	.led_max	= MC34708_LED_G,
	.num_regs	= 1,
	.ledctrl_base	= 54,
};

static const struct platform_device_id mc13xxx_led_id_table[] = {
	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
	{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
	{ }
};
MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);

static struct platform_driver mc13xxx_led_driver = {
	.driver	= {
		.name	= "mc13xxx-led",
	},
	.remove		= mc13xxx_led_remove,
	.id_table	= mc13xxx_led_id_table,
};
module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);

MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
MODULE_LICENSE("GPL");