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path: root/drivers/leds/leds-88pm860x.c
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Diffstat (limited to 'drivers/leds/leds-88pm860x.c')
-rw-r--r--drivers/leds/leds-88pm860x.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/drivers/leds/leds-88pm860x.c b/drivers/leds/leds-88pm860x.c
new file mode 100644
index 000000000000..d196073a6aeb
--- /dev/null
+++ b/drivers/leds/leds-88pm860x.c
@@ -0,0 +1,325 @@
1/*
2 * LED driver for Marvell 88PM860x
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/i2c.h>
17#include <linux/leds.h>
18#include <linux/workqueue.h>
19#include <linux/mfd/88pm860x.h>
20
21#define LED_PWM_SHIFT (3)
22#define LED_PWM_MASK (0x1F)
23#define LED_CURRENT_MASK (0x07 << 5)
24
25#define LED_BLINK_ON_MASK (0x07)
26#define LED_BLINK_PERIOD_MASK (0x0F << 3)
27#define LED_BLINK_MASK (0x7F)
28
29#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
30#define LED_BLINK_PERIOD(x) ((x & 0xF) * 530 + 930)
31#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
32#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
33#define LED_BLINK_PERIOD_MIN LED_BLINK_PERIOD(0)
34#define LED_BLINK_PERIOD_MAX LED_BLINK_PERIOD(0xE)
35#define LED_TO_ON(x) ((x - 66) / 66)
36#define LED_TO_PERIOD(x) ((x - 930) / 530)
37
38#define LED1_BLINK_EN (1 << 1)
39#define LED2_BLINK_EN (1 << 2)
40
41enum {
42 SET_BRIGHTNESS,
43 SET_BLINK,
44};
45
46struct pm860x_led {
47 struct led_classdev cdev;
48 struct i2c_client *i2c;
49 struct work_struct work;
50 struct pm860x_chip *chip;
51 struct mutex lock;
52 char name[MFD_NAME_SIZE];
53
54 int port;
55 int iset;
56 int command;
57 int offset;
58 unsigned char brightness;
59 unsigned char current_brightness;
60
61 int blink_data;
62 int blink_time;
63 int blink_on;
64 int blink_off;
65};
66
67/* return offset of color register */
68static inline int __led_off(int port)
69{
70 int ret = -EINVAL;
71
72 switch (port) {
73 case PM8606_LED1_RED:
74 case PM8606_LED1_GREEN:
75 case PM8606_LED1_BLUE:
76 ret = port - PM8606_LED1_RED + PM8606_RGB1B;
77 break;
78 case PM8606_LED2_RED:
79 case PM8606_LED2_GREEN:
80 case PM8606_LED2_BLUE:
81 ret = port - PM8606_LED2_RED + PM8606_RGB2B;
82 break;
83 }
84 return ret;
85}
86
87/* return offset of blink register */
88static inline int __blink_off(int port)
89{
90 int ret = -EINVAL;
91
92 switch (port) {
93 case PM8606_LED1_RED:
94 case PM8606_LED1_GREEN:
95 case PM8606_LED1_BLUE:
96 ret = PM8606_RGB1A;
97 case PM8606_LED2_RED:
98 case PM8606_LED2_GREEN:
99 case PM8606_LED2_BLUE:
100 ret = PM8606_RGB2A;
101 }
102 return ret;
103}
104
105static inline int __blink_ctl_mask(int port)
106{
107 int ret = -EINVAL;
108
109 switch (port) {
110 case PM8606_LED1_RED:
111 case PM8606_LED1_GREEN:
112 case PM8606_LED1_BLUE:
113 ret = LED1_BLINK_EN;
114 break;
115 case PM8606_LED2_RED:
116 case PM8606_LED2_GREEN:
117 case PM8606_LED2_BLUE:
118 ret = LED2_BLINK_EN;
119 break;
120 }
121 return ret;
122}
123
124static int __led_set(struct pm860x_led *led, int command)
125{
126 struct pm860x_chip *chip = led->chip;
127 int mask, ret;
128
129 mutex_lock(&led->lock);
130 switch (command) {
131 case SET_BRIGHTNESS:
132 if ((led->current_brightness == 0) && led->brightness) {
133 if (led->iset) {
134 ret = pm860x_set_bits(led->i2c, led->offset,
135 LED_CURRENT_MASK, led->iset);
136 if (ret < 0)
137 goto out;
138 }
139 } else if (led->brightness == 0) {
140 ret = pm860x_set_bits(led->i2c, led->offset,
141 LED_CURRENT_MASK, 0);
142 if (ret < 0)
143 goto out;
144 }
145 ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK,
146 led->brightness);
147 if (ret < 0)
148 goto out;
149 led->current_brightness = led->brightness;
150 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
151 led->offset, led->brightness);
152 break;
153 case SET_BLINK:
154 ret = pm860x_set_bits(led->i2c, led->offset,
155 LED_BLINK_MASK, led->blink_data);
156 if (ret < 0)
157 goto out;
158
159 mask = __blink_ctl_mask(led->port);
160 ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
161 if (ret < 0)
162 goto out;
163 dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
164 led->blink_on, led->blink_off);
165 break;
166 }
167out:
168 mutex_unlock(&led->lock);
169 return 0;
170}
171
172static void pm860x_led_work(struct work_struct *work)
173{
174 struct pm860x_led *led;
175
176 led = container_of(work, struct pm860x_led, work);
177 __led_set(led, led->command);
178}
179
180static void pm860x_led_set(struct led_classdev *cdev,
181 enum led_brightness value)
182{
183 struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
184
185 data->offset = __led_off(data->port);
186 data->brightness = value >> 3;
187 data->command = SET_BRIGHTNESS;
188 schedule_work(&data->work);
189}
190
191static int pm860x_led_blink(struct led_classdev *cdev,
192 unsigned long *delay_on,
193 unsigned long *delay_off)
194{
195 struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
196 int period, on;
197
198 on = *delay_on;
199 if ((on < LED_BLINK_ON_MIN) || (on > LED_BLINK_ON_MAX))
200 return -EINVAL;
201
202 on = LED_TO_ON(on);
203 on = LED_BLINK_ON(on);
204
205 period = on + *delay_off;
206 if ((period < LED_BLINK_PERIOD_MIN) || (period > LED_BLINK_PERIOD_MAX))
207 return -EINVAL;
208 period = LED_TO_PERIOD(period);
209 period = LED_BLINK_PERIOD(period);
210
211 data->offset = __blink_off(data->port);
212 data->blink_on = on;
213 data->blink_off = period - data->blink_on;
214 data->blink_data = (period << 3) | data->blink_on;
215 data->command = SET_BLINK;
216 schedule_work(&data->work);
217
218 return 0;
219}
220
221static int __check_device(struct pm860x_led_pdata *pdata, char *name)
222{
223 struct pm860x_led_pdata *p = pdata;
224 int ret = -EINVAL;
225
226 while (p && p->id) {
227 if ((p->id != PM8606_ID_LED) || (p->flags < 0))
228 break;
229
230 if (!strncmp(name, pm860x_led_name[p->flags],
231 MFD_NAME_SIZE)) {
232 ret = (int)p->flags;
233 break;
234 }
235 p++;
236 }
237 return ret;
238}
239
240static int pm860x_led_probe(struct platform_device *pdev)
241{
242 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
243 struct pm860x_platform_data *pm860x_pdata;
244 struct pm860x_led_pdata *pdata;
245 struct pm860x_led *data;
246 struct resource *res;
247 int ret;
248
249 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
250 if (res == NULL) {
251 dev_err(&pdev->dev, "No I/O resource!\n");
252 return -EINVAL;
253 }
254
255 if (pdev->dev.parent->platform_data) {
256 pm860x_pdata = pdev->dev.parent->platform_data;
257 pdata = pm860x_pdata->led;
258 } else
259 pdata = NULL;
260
261 data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
262 if (data == NULL)
263 return -ENOMEM;
264 strncpy(data->name, res->name, MFD_NAME_SIZE);
265 dev_set_drvdata(&pdev->dev, data);
266 data->chip = chip;
267 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
268 data->iset = pdata->iset;
269 data->port = __check_device(pdata, data->name);
270 if (data->port < 0)
271 return -EINVAL;
272
273 data->current_brightness = 0;
274 data->cdev.name = data->name;
275 data->cdev.brightness_set = pm860x_led_set;
276 data->cdev.blink_set = pm860x_led_blink;
277 mutex_init(&data->lock);
278 INIT_WORK(&data->work, pm860x_led_work);
279
280 ret = led_classdev_register(chip->dev, &data->cdev);
281 if (ret < 0) {
282 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
283 goto out;
284 }
285 return 0;
286out:
287 kfree(data);
288 return ret;
289}
290
291static int pm860x_led_remove(struct platform_device *pdev)
292{
293 struct pm860x_led *data = platform_get_drvdata(pdev);
294
295 led_classdev_unregister(&data->cdev);
296 kfree(data);
297
298 return 0;
299}
300
301static struct platform_driver pm860x_led_driver = {
302 .driver = {
303 .name = "88pm860x-led",
304 .owner = THIS_MODULE,
305 },
306 .probe = pm860x_led_probe,
307 .remove = pm860x_led_remove,
308};
309
310static int __devinit pm860x_led_init(void)
311{
312 return platform_driver_register(&pm860x_led_driver);
313}
314module_init(pm860x_led_init);
315
316static void __devexit pm860x_led_exit(void)
317{
318 platform_driver_unregister(&pm860x_led_driver);
319}
320module_exit(pm860x_led_exit);
321
322MODULE_DESCRIPTION("LED driver for Marvell PM860x");
323MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
324MODULE_LICENSE("GPL");
325MODULE_ALIAS("platform:88pm860x-led");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 02:44:28 -0500