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0a2f915b HZ |
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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
0a2f915b HZ |
19 | #include <linux/workqueue.h> |
20 | #include <linux/mfd/88pm860x.h> | |
21 | ||
22 | #define LED_PWM_SHIFT (3) | |
23 | #define LED_PWM_MASK (0x1F) | |
24 | #define LED_CURRENT_MASK (0x07 << 5) | |
25 | ||
26 | #define LED_BLINK_ON_MASK (0x07) | |
27 | #define LED_BLINK_PERIOD_MASK (0x0F << 3) | |
28 | #define LED_BLINK_MASK (0x7F) | |
29 | ||
30 | #define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66) | |
31 | #define LED_BLINK_PERIOD(x) ((x & 0xF) * 530 + 930) | |
32 | #define LED_BLINK_ON_MIN LED_BLINK_ON(0) | |
33 | #define LED_BLINK_ON_MAX LED_BLINK_ON(0x7) | |
34 | #define LED_BLINK_PERIOD_MIN LED_BLINK_PERIOD(0) | |
35 | #define LED_BLINK_PERIOD_MAX LED_BLINK_PERIOD(0xE) | |
36 | #define LED_TO_ON(x) ((x - 66) / 66) | |
37 | #define LED_TO_PERIOD(x) ((x - 930) / 530) | |
38 | ||
39 | #define LED1_BLINK_EN (1 << 1) | |
40 | #define LED2_BLINK_EN (1 << 2) | |
41 | ||
42 | enum { | |
43 | SET_BRIGHTNESS, | |
44 | SET_BLINK, | |
45 | }; | |
46 | ||
47 | struct pm860x_led { | |
48 | struct led_classdev cdev; | |
49 | struct i2c_client *i2c; | |
50 | struct work_struct work; | |
51 | struct pm860x_chip *chip; | |
52 | struct mutex lock; | |
53 | char name[MFD_NAME_SIZE]; | |
54 | ||
55 | int port; | |
56 | int iset; | |
57 | int command; | |
58 | int offset; | |
59 | unsigned char brightness; | |
60 | unsigned char current_brightness; | |
61 | ||
62 | int blink_data; | |
63 | int blink_time; | |
64 | int blink_on; | |
65 | int blink_off; | |
66 | }; | |
67 | ||
68 | /* return offset of color register */ | |
69 | static inline int __led_off(int port) | |
70 | { | |
71 | int ret = -EINVAL; | |
72 | ||
73 | switch (port) { | |
74 | case PM8606_LED1_RED: | |
75 | case PM8606_LED1_GREEN: | |
76 | case PM8606_LED1_BLUE: | |
77 | ret = port - PM8606_LED1_RED + PM8606_RGB1B; | |
78 | break; | |
79 | case PM8606_LED2_RED: | |
80 | case PM8606_LED2_GREEN: | |
81 | case PM8606_LED2_BLUE: | |
82 | ret = port - PM8606_LED2_RED + PM8606_RGB2B; | |
83 | break; | |
84 | } | |
85 | return ret; | |
86 | } | |
87 | ||
88 | /* return offset of blink register */ | |
89 | static inline int __blink_off(int port) | |
90 | { | |
91 | int ret = -EINVAL; | |
92 | ||
93 | switch (port) { | |
94 | case PM8606_LED1_RED: | |
95 | case PM8606_LED1_GREEN: | |
96 | case PM8606_LED1_BLUE: | |
97 | ret = PM8606_RGB1A; | |
98 | case PM8606_LED2_RED: | |
99 | case PM8606_LED2_GREEN: | |
100 | case PM8606_LED2_BLUE: | |
101 | ret = PM8606_RGB2A; | |
102 | } | |
103 | return ret; | |
104 | } | |
105 | ||
106 | static inline int __blink_ctl_mask(int port) | |
107 | { | |
108 | int ret = -EINVAL; | |
109 | ||
110 | switch (port) { | |
111 | case PM8606_LED1_RED: | |
112 | case PM8606_LED1_GREEN: | |
113 | case PM8606_LED1_BLUE: | |
114 | ret = LED1_BLINK_EN; | |
115 | break; | |
116 | case PM8606_LED2_RED: | |
117 | case PM8606_LED2_GREEN: | |
118 | case PM8606_LED2_BLUE: | |
119 | ret = LED2_BLINK_EN; | |
120 | break; | |
121 | } | |
122 | return ret; | |
123 | } | |
124 | ||
125 | static int __led_set(struct pm860x_led *led, int command) | |
126 | { | |
127 | struct pm860x_chip *chip = led->chip; | |
128 | int mask, ret; | |
129 | ||
130 | mutex_lock(&led->lock); | |
131 | switch (command) { | |
132 | case SET_BRIGHTNESS: | |
133 | if ((led->current_brightness == 0) && led->brightness) { | |
134 | if (led->iset) { | |
135 | ret = pm860x_set_bits(led->i2c, led->offset, | |
136 | LED_CURRENT_MASK, led->iset); | |
137 | if (ret < 0) | |
138 | goto out; | |
139 | } | |
140 | } else if (led->brightness == 0) { | |
141 | ret = pm860x_set_bits(led->i2c, led->offset, | |
142 | LED_CURRENT_MASK, 0); | |
143 | if (ret < 0) | |
144 | goto out; | |
145 | } | |
146 | ret = pm860x_set_bits(led->i2c, led->offset, LED_PWM_MASK, | |
147 | led->brightness); | |
148 | if (ret < 0) | |
149 | goto out; | |
150 | led->current_brightness = led->brightness; | |
151 | dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", | |
152 | led->offset, led->brightness); | |
153 | break; | |
154 | case SET_BLINK: | |
155 | ret = pm860x_set_bits(led->i2c, led->offset, | |
156 | LED_BLINK_MASK, led->blink_data); | |
157 | if (ret < 0) | |
158 | goto out; | |
159 | ||
160 | mask = __blink_ctl_mask(led->port); | |
161 | ret = pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask); | |
162 | if (ret < 0) | |
163 | goto out; | |
164 | dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n", | |
165 | led->blink_on, led->blink_off); | |
166 | break; | |
167 | } | |
168 | out: | |
169 | mutex_unlock(&led->lock); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static void pm860x_led_work(struct work_struct *work) | |
174 | { | |
175 | struct pm860x_led *led; | |
176 | ||
177 | led = container_of(work, struct pm860x_led, work); | |
178 | __led_set(led, led->command); | |
179 | } | |
180 | ||
181 | static void pm860x_led_set(struct led_classdev *cdev, | |
182 | enum led_brightness value) | |
183 | { | |
184 | struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); | |
185 | ||
186 | data->offset = __led_off(data->port); | |
187 | data->brightness = value >> 3; | |
188 | data->command = SET_BRIGHTNESS; | |
189 | schedule_work(&data->work); | |
190 | } | |
191 | ||
192 | static int pm860x_led_blink(struct led_classdev *cdev, | |
193 | unsigned long *delay_on, | |
194 | unsigned long *delay_off) | |
195 | { | |
196 | struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); | |
197 | int period, on; | |
198 | ||
199 | on = *delay_on; | |
200 | if ((on < LED_BLINK_ON_MIN) || (on > LED_BLINK_ON_MAX)) | |
201 | return -EINVAL; | |
202 | ||
203 | on = LED_TO_ON(on); | |
204 | on = LED_BLINK_ON(on); | |
205 | ||
206 | period = on + *delay_off; | |
207 | if ((period < LED_BLINK_PERIOD_MIN) || (period > LED_BLINK_PERIOD_MAX)) | |
208 | return -EINVAL; | |
209 | period = LED_TO_PERIOD(period); | |
210 | period = LED_BLINK_PERIOD(period); | |
211 | ||
212 | data->offset = __blink_off(data->port); | |
213 | data->blink_on = on; | |
214 | data->blink_off = period - data->blink_on; | |
215 | data->blink_data = (period << 3) | data->blink_on; | |
216 | data->command = SET_BLINK; | |
217 | schedule_work(&data->work); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static int __check_device(struct pm860x_led_pdata *pdata, char *name) | |
223 | { | |
224 | struct pm860x_led_pdata *p = pdata; | |
225 | int ret = -EINVAL; | |
226 | ||
227 | while (p && p->id) { | |
228 | if ((p->id != PM8606_ID_LED) || (p->flags < 0)) | |
229 | break; | |
230 | ||
231 | if (!strncmp(name, pm860x_led_name[p->flags], | |
232 | MFD_NAME_SIZE)) { | |
233 | ret = (int)p->flags; | |
234 | break; | |
235 | } | |
236 | p++; | |
237 | } | |
238 | return ret; | |
239 | } | |
240 | ||
241 | static int pm860x_led_probe(struct platform_device *pdev) | |
242 | { | |
243 | struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
244 | struct pm860x_platform_data *pm860x_pdata; | |
245 | struct pm860x_led_pdata *pdata; | |
246 | struct pm860x_led *data; | |
247 | struct resource *res; | |
248 | int ret; | |
249 | ||
250 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
251 | if (res == NULL) { | |
252 | dev_err(&pdev->dev, "No I/O resource!\n"); | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | if (pdev->dev.parent->platform_data) { | |
257 | pm860x_pdata = pdev->dev.parent->platform_data; | |
258 | pdata = pm860x_pdata->led; | |
259 | } else | |
260 | pdata = NULL; | |
261 | ||
262 | data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL); | |
263 | if (data == NULL) | |
264 | return -ENOMEM; | |
265 | strncpy(data->name, res->name, MFD_NAME_SIZE); | |
266 | dev_set_drvdata(&pdev->dev, data); | |
267 | data->chip = chip; | |
268 | data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; | |
269 | data->iset = pdata->iset; | |
270 | data->port = __check_device(pdata, data->name); | |
271 | if (data->port < 0) | |
272 | return -EINVAL; | |
273 | ||
274 | data->current_brightness = 0; | |
275 | data->cdev.name = data->name; | |
276 | data->cdev.brightness_set = pm860x_led_set; | |
277 | data->cdev.blink_set = pm860x_led_blink; | |
278 | mutex_init(&data->lock); | |
279 | INIT_WORK(&data->work, pm860x_led_work); | |
280 | ||
281 | ret = led_classdev_register(chip->dev, &data->cdev); | |
282 | if (ret < 0) { | |
283 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); | |
284 | goto out; | |
285 | } | |
286 | return 0; | |
287 | out: | |
288 | kfree(data); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | static int pm860x_led_remove(struct platform_device *pdev) | |
293 | { | |
294 | struct pm860x_led *data = platform_get_drvdata(pdev); | |
295 | ||
296 | led_classdev_unregister(&data->cdev); | |
297 | kfree(data); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static struct platform_driver pm860x_led_driver = { | |
303 | .driver = { | |
304 | .name = "88pm860x-led", | |
305 | .owner = THIS_MODULE, | |
306 | }, | |
307 | .probe = pm860x_led_probe, | |
308 | .remove = pm860x_led_remove, | |
309 | }; | |
310 | ||
311 | static int __devinit pm860x_led_init(void) | |
312 | { | |
313 | return platform_driver_register(&pm860x_led_driver); | |
314 | } | |
315 | module_init(pm860x_led_init); | |
316 | ||
317 | static void __devexit pm860x_led_exit(void) | |
318 | { | |
319 | platform_driver_unregister(&pm860x_led_driver); | |
320 | } | |
321 | module_exit(pm860x_led_exit); | |
322 | ||
323 | MODULE_DESCRIPTION("LED driver for Marvell PM860x"); | |
324 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
325 | MODULE_LICENSE("GPL"); | |
326 | MODULE_ALIAS("platform:88pm860x-led"); |