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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/slab.h> |
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_MASK (0x7F) |
28 | |
29 | #define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66) |
30 | #define LED_BLINK_ON_MIN LED_BLINK_ON(0) |
31 | #define LED_BLINK_ON_MAX LED_BLINK_ON(0x7) |
32 | #define LED_ON_CONTINUOUS (0x0F << 3) |
33 | #define LED_TO_ON(x) ((x - 66) / 66) |
34 | |
35 | #define LED1_BLINK_EN (1 << 1) |
36 | #define LED2_BLINK_EN (1 << 2) |
37 | |
38 | struct pm860x_led { |
39 | struct led_classdev cdev; |
40 | struct i2c_client *i2c; |
41 | struct work_struct work; |
42 | struct pm860x_chip *chip; |
43 | struct mutex lock; |
44 | char name[MFD_NAME_SIZE]; |
45 | |
46 | int port; |
47 | int iset; |
48 | unsigned char brightness; |
49 | unsigned char current_brightness; |
50 | |
51 | int blink_data; |
52 | int blink_time; |
53 | int blink_on; |
54 | int blink_off; |
55 | }; |
56 | |
57 | /* return offset of color register */ |
58 | static inline int __led_off(int port) |
59 | { |
60 | int ret = -EINVAL; |
61 | |
62 | switch (port) { |
63 | case PM8606_LED1_RED: |
64 | case PM8606_LED1_GREEN: |
65 | case PM8606_LED1_BLUE: |
66 | ret = port - PM8606_LED1_RED + PM8606_RGB1B; |
67 | break; |
68 | case PM8606_LED2_RED: |
69 | case PM8606_LED2_GREEN: |
70 | case PM8606_LED2_BLUE: |
71 | ret = port - PM8606_LED2_RED + PM8606_RGB2B; |
72 | break; |
73 | } |
74 | return ret; |
75 | } |
76 | |
77 | /* return offset of blink register */ |
78 | static inline int __blink_off(int port) |
79 | { |
80 | int ret = -EINVAL; |
81 | |
82 | switch (port) { |
83 | case PM8606_LED1_RED: |
84 | case PM8606_LED1_GREEN: |
85 | case PM8606_LED1_BLUE: |
86 | ret = PM8606_RGB1A; |
87 | break; |
88 | case PM8606_LED2_RED: |
89 | case PM8606_LED2_GREEN: |
90 | case PM8606_LED2_BLUE: |
91 | ret = PM8606_RGB2A; |
92 | break; |
93 | } |
94 | return ret; |
95 | } |
96 | |
97 | static inline int __blink_ctl_mask(int port) |
98 | { |
99 | int ret = -EINVAL; |
100 | |
101 | switch (port) { |
102 | case PM8606_LED1_RED: |
103 | case PM8606_LED1_GREEN: |
104 | case PM8606_LED1_BLUE: |
105 | ret = LED1_BLINK_EN; |
106 | break; |
107 | case PM8606_LED2_RED: |
108 | case PM8606_LED2_GREEN: |
109 | case PM8606_LED2_BLUE: |
110 | ret = LED2_BLINK_EN; |
111 | break; |
112 | } |
113 | return ret; |
114 | } |
115 | |
116 | static void pm860x_led_work(struct work_struct *work) |
117 | { |
118 | |
119 | struct pm860x_led *led; |
120 | struct pm860x_chip *chip; |
121 | int mask; |
122 | |
123 | led = container_of(work, struct pm860x_led, work); |
124 | chip = led->chip; |
125 | mutex_lock(&led->lock); |
126 | if ((led->current_brightness == 0) && led->brightness) { |
127 | if (led->iset) { |
128 | pm860x_set_bits(led->i2c, __led_off(led->port), |
129 | LED_CURRENT_MASK, led->iset); |
130 | } |
131 | mask = __blink_ctl_mask(led->port); |
132 | pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask); |
133 | } else if (led->brightness == 0) { |
134 | pm860x_set_bits(led->i2c, __led_off(led->port), |
135 | LED_CURRENT_MASK, 0); |
136 | mask = __blink_ctl_mask(led->port); |
137 | pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0); |
138 | } |
139 | pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK, |
140 | led->brightness); |
141 | led->current_brightness = led->brightness; |
142 | dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", |
143 | __led_off(led->port), led->brightness); |
144 | mutex_unlock(&led->lock); |
145 | } |
146 | |
147 | static void pm860x_led_set(struct led_classdev *cdev, |
148 | enum led_brightness value) |
149 | { |
150 | struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); |
151 | |
152 | data->brightness = value >> 3; |
153 | schedule_work(&data->work); |
154 | } |
155 | |
156 | static int __check_device(struct pm860x_led_pdata *pdata, char *name) |
157 | { |
158 | struct pm860x_led_pdata *p = pdata; |
159 | int ret = -EINVAL; |
160 | |
161 | while (p && p->id) { |
162 | if ((p->id != PM8606_ID_LED) || (p->flags < 0)) |
163 | break; |
164 | |
165 | if (!strncmp(name, pm860x_led_name[p->flags], |
166 | MFD_NAME_SIZE)) { |
167 | ret = (int)p->flags; |
168 | break; |
169 | } |
170 | p++; |
171 | } |
172 | return ret; |
173 | } |
174 | |
175 | static int pm860x_led_probe(struct platform_device *pdev) |
176 | { |
177 | struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); |
178 | struct pm860x_platform_data *pm860x_pdata; |
179 | struct pm860x_led_pdata *pdata; |
180 | struct pm860x_led *data; |
181 | struct resource *res; |
182 | int ret; |
183 | |
184 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
185 | if (res == NULL) { |
186 | dev_err(&pdev->dev, "No I/O resource!\n"); |
187 | return -EINVAL; |
188 | } |
189 | |
190 | if (pdev->dev.parent->platform_data) { |
191 | pm860x_pdata = pdev->dev.parent->platform_data; |
192 | pdata = pm860x_pdata->led; |
193 | } else { |
194 | dev_err(&pdev->dev, "No platform data!\n"); |
195 | return -EINVAL; |
196 | } |
197 | |
198 | data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL); |
199 | if (data == NULL) |
200 | return -ENOMEM; |
201 | strncpy(data->name, res->name, MFD_NAME_SIZE); |
202 | dev_set_drvdata(&pdev->dev, data); |
203 | data->chip = chip; |
204 | data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; |
205 | data->iset = pdata->iset; |
206 | data->port = __check_device(pdata, data->name); |
207 | if (data->port < 0) { |
208 | dev_err(&pdev->dev, "check device failed\n"); |
209 | kfree(data); |
210 | return -EINVAL; |
211 | } |
212 | |
213 | data->current_brightness = 0; |
214 | data->cdev.name = data->name; |
215 | data->cdev.brightness_set = pm860x_led_set; |
216 | mutex_init(&data->lock); |
217 | INIT_WORK(&data->work, pm860x_led_work); |
218 | |
219 | ret = led_classdev_register(chip->dev, &data->cdev); |
220 | if (ret < 0) { |
221 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); |
222 | goto out; |
223 | } |
224 | return 0; |
225 | out: |
226 | kfree(data); |
227 | return ret; |
228 | } |
229 | |
230 | static int pm860x_led_remove(struct platform_device *pdev) |
231 | { |
232 | struct pm860x_led *data = platform_get_drvdata(pdev); |
233 | |
234 | led_classdev_unregister(&data->cdev); |
235 | kfree(data); |
236 | |
237 | return 0; |
238 | } |
239 | |
240 | static struct platform_driver pm860x_led_driver = { |
241 | .driver = { |
242 | .name = "88pm860x-led", |
243 | .owner = THIS_MODULE, |
244 | }, |
245 | .probe = pm860x_led_probe, |
246 | .remove = pm860x_led_remove, |
247 | }; |
248 | |
249 | static int __devinit pm860x_led_init(void) |
250 | { |
251 | return platform_driver_register(&pm860x_led_driver); |
252 | } |
253 | module_init(pm860x_led_init); |
254 | |
255 | static void __devexit pm860x_led_exit(void) |
256 | { |
257 | platform_driver_unregister(&pm860x_led_driver); |
258 | } |
259 | module_exit(pm860x_led_exit); |
260 | |
261 | MODULE_DESCRIPTION("LED driver for Marvell PM860x"); |
262 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); |
263 | MODULE_LICENSE("GPL"); |
264 | MODULE_ALIAS("platform:88pm860x-led"); |
265 |
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