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 #include <linux/module.h>
22
23 #define LED_PWM_SHIFT (3)
24 #define LED_PWM_MASK (0x1F)
25 #define LED_CURRENT_MASK (0x07 << 5)
26
27 #define LED_BLINK_ON_MASK (0x07)
28 #define LED_BLINK_MASK (0x7F)
29
30 #define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
31 #define LED_BLINK_ON_MIN LED_BLINK_ON(0)
32 #define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
33 #define LED_ON_CONTINUOUS (0x0F << 3)
34 #define LED_TO_ON(x) ((x - 66) / 66)
35
36 #define LED1_BLINK_EN (1 << 1)
37 #define LED2_BLINK_EN (1 << 2)
38
39 struct pm860x_led {
40 struct led_classdev cdev;
41 struct i2c_client *i2c;
42 struct work_struct work;
43 struct pm860x_chip *chip;
44 struct mutex lock;
45 char name[MFD_NAME_SIZE];
46
47 int port;
48 int iset;
49 unsigned char brightness;
50 unsigned char current_brightness;
51
52 int blink_data;
53 int blink_time;
54 int blink_on;
55 int blink_off;
56 };
57
58 /* return offset of color register */
__led_off(int port)59 static inline int __led_off(int port)
60 {
61 int ret = -EINVAL;
62
63 switch (port) {
64 case PM8606_LED1_RED:
65 case PM8606_LED1_GREEN:
66 case PM8606_LED1_BLUE:
67 ret = port - PM8606_LED1_RED + PM8606_RGB1B;
68 break;
69 case PM8606_LED2_RED:
70 case PM8606_LED2_GREEN:
71 case PM8606_LED2_BLUE:
72 ret = port - PM8606_LED2_RED + PM8606_RGB2B;
73 break;
74 }
75 return ret;
76 }
77
78 /* return offset of blink register */
__blink_off(int port)79 static inline int __blink_off(int port)
80 {
81 int ret = -EINVAL;
82
83 switch (port) {
84 case PM8606_LED1_RED:
85 case PM8606_LED1_GREEN:
86 case PM8606_LED1_BLUE:
87 ret = PM8606_RGB1A;
88 break;
89 case PM8606_LED2_RED:
90 case PM8606_LED2_GREEN:
91 case PM8606_LED2_BLUE:
92 ret = PM8606_RGB2A;
93 break;
94 }
95 return ret;
96 }
97
__blink_ctl_mask(int port)98 static inline int __blink_ctl_mask(int port)
99 {
100 int ret = -EINVAL;
101
102 switch (port) {
103 case PM8606_LED1_RED:
104 case PM8606_LED1_GREEN:
105 case PM8606_LED1_BLUE:
106 ret = LED1_BLINK_EN;
107 break;
108 case PM8606_LED2_RED:
109 case PM8606_LED2_GREEN:
110 case PM8606_LED2_BLUE:
111 ret = LED2_BLINK_EN;
112 break;
113 }
114 return ret;
115 }
116
led_power_set(struct pm860x_chip * chip,int port,int on)117 static int led_power_set(struct pm860x_chip *chip, int port, int on)
118 {
119 int ret = -EINVAL;
120
121 switch (port) {
122 case PM8606_LED1_RED:
123 case PM8606_LED1_GREEN:
124 case PM8606_LED1_BLUE:
125 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
126 pm8606_osc_disable(chip, RGB1_ENABLE);
127 break;
128 case PM8606_LED2_RED:
129 case PM8606_LED2_GREEN:
130 case PM8606_LED2_BLUE:
131 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
132 pm8606_osc_disable(chip, RGB2_ENABLE);
133 break;
134 }
135 return ret;
136 }
137
pm860x_led_work(struct work_struct * work)138 static void pm860x_led_work(struct work_struct *work)
139 {
140
141 struct pm860x_led *led;
142 struct pm860x_chip *chip;
143 unsigned char buf[3];
144 int mask, ret;
145
146 led = container_of(work, struct pm860x_led, work);
147 chip = led->chip;
148 mutex_lock(&led->lock);
149 if ((led->current_brightness == 0) && led->brightness) {
150 led_power_set(chip, led->port, 1);
151 if (led->iset) {
152 pm860x_set_bits(led->i2c, __led_off(led->port),
153 LED_CURRENT_MASK, led->iset);
154 }
155 pm860x_set_bits(led->i2c, __blink_off(led->port),
156 LED_BLINK_MASK, LED_ON_CONTINUOUS);
157 mask = __blink_ctl_mask(led->port);
158 pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
159 }
160 pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
161 led->brightness);
162
163 if (led->brightness == 0) {
164 pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf);
165 ret = buf[0] & LED_PWM_MASK;
166 ret |= buf[1] & LED_PWM_MASK;
167 ret |= buf[2] & LED_PWM_MASK;
168 if (ret == 0) {
169 /* unset current since no led is lighting */
170 pm860x_set_bits(led->i2c, __led_off(led->port),
171 LED_CURRENT_MASK, 0);
172 mask = __blink_ctl_mask(led->port);
173 pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0);
174 led_power_set(chip, led->port, 0);
175 }
176 }
177 led->current_brightness = led->brightness;
178 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
179 __led_off(led->port), led->brightness);
180 mutex_unlock(&led->lock);
181 }
182
pm860x_led_set(struct led_classdev * cdev,enum led_brightness value)183 static void pm860x_led_set(struct led_classdev *cdev,
184 enum led_brightness value)
185 {
186 struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
187
188 data->brightness = value >> 3;
189 schedule_work(&data->work);
190 }
191
pm860x_led_probe(struct platform_device * pdev)192 static int pm860x_led_probe(struct platform_device *pdev)
193 {
194 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
195 struct pm860x_led_pdata *pdata;
196 struct pm860x_led *data;
197 struct resource *res;
198 int ret;
199
200 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
201 if (res == NULL) {
202 dev_err(&pdev->dev, "No I/O resource!\n");
203 return -EINVAL;
204 }
205
206 pdata = pdev->dev.platform_data;
207 if (pdata == NULL) {
208 dev_err(&pdev->dev, "No platform data!\n");
209 return -EINVAL;
210 }
211
212 data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
213 if (data == NULL)
214 return -ENOMEM;
215 strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
216 dev_set_drvdata(&pdev->dev, data);
217 data->chip = chip;
218 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
219 data->iset = pdata->iset;
220 data->port = pdata->flags;
221 if (data->port < 0) {
222 dev_err(&pdev->dev, "check device failed\n");
223 kfree(data);
224 return -EINVAL;
225 }
226
227 data->current_brightness = 0;
228 data->cdev.name = data->name;
229 data->cdev.brightness_set = pm860x_led_set;
230 mutex_init(&data->lock);
231 INIT_WORK(&data->work, pm860x_led_work);
232
233 ret = led_classdev_register(chip->dev, &data->cdev);
234 if (ret < 0) {
235 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
236 goto out;
237 }
238 pm860x_led_set(&data->cdev, 0);
239 return 0;
240 out:
241 kfree(data);
242 return ret;
243 }
244
pm860x_led_remove(struct platform_device * pdev)245 static int pm860x_led_remove(struct platform_device *pdev)
246 {
247 struct pm860x_led *data = platform_get_drvdata(pdev);
248
249 led_classdev_unregister(&data->cdev);
250 kfree(data);
251
252 return 0;
253 }
254
255 static struct platform_driver pm860x_led_driver = {
256 .driver = {
257 .name = "88pm860x-led",
258 .owner = THIS_MODULE,
259 },
260 .probe = pm860x_led_probe,
261 .remove = pm860x_led_remove,
262 };
263
264 module_platform_driver(pm860x_led_driver);
265
266 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
267 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
268 MODULE_LICENSE("GPL");
269 MODULE_ALIAS("platform:88pm860x-led");
270