2 * LED driver for Marvell 88PM860x
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
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.
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/core.h>
21 #include <linux/mfd/88pm860x.h>
23 #define LED_PWM_SHIFT (3)
24 #define LED_PWM_MASK (0x1F)
25 #define LED_CURRENT_MASK (0x07 << 5)
27 #define LED_BLINK_ON_MASK (0x07)
28 #define LED_BLINK_MASK (0x7F)
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)
36 #define LED1_BLINK_EN (1 << 1)
37 #define LED2_BLINK_EN (1 << 2)
40 struct led_classdev cdev;
41 struct i2c_client *i2c;
42 struct work_struct work;
43 struct pm860x_chip *chip;
45 char name[MFD_NAME_SIZE];
49 unsigned char brightness;
50 unsigned char current_brightness;
58 /* return offset of color register */
59 static inline int __led_off(int port)
65 case PM8606_LED1_GREEN:
66 case PM8606_LED1_BLUE:
67 ret = port - PM8606_LED1_RED + PM8606_RGB1B;
70 case PM8606_LED2_GREEN:
71 case PM8606_LED2_BLUE:
72 ret = port - PM8606_LED2_RED + PM8606_RGB2B;
78 /* return offset of blink register */
79 static inline int __blink_off(int port)
85 case PM8606_LED1_GREEN:
86 case PM8606_LED1_BLUE:
90 case PM8606_LED2_GREEN:
91 case PM8606_LED2_BLUE:
98 static inline int __blink_ctl_mask(int port)
103 case PM8606_LED1_RED:
104 case PM8606_LED1_GREEN:
105 case PM8606_LED1_BLUE:
108 case PM8606_LED2_RED:
109 case PM8606_LED2_GREEN:
110 case PM8606_LED2_BLUE:
117 static void pm860x_led_work(struct work_struct *work)
120 struct pm860x_led *led;
121 struct pm860x_chip *chip;
122 unsigned char buf[3];
125 led = container_of(work, struct pm860x_led, work);
127 mutex_lock(&led->lock);
128 if ((led->current_brightness == 0) && led->brightness) {
130 pm860x_set_bits(led->i2c, __led_off(led->port),
131 LED_CURRENT_MASK, led->iset);
133 pm860x_set_bits(led->i2c, __blink_off(led->port),
134 LED_BLINK_MASK, LED_ON_CONTINUOUS);
135 mask = __blink_ctl_mask(led->port);
136 pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
138 pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
141 if (led->brightness == 0) {
142 pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf);
143 ret = buf[0] & LED_PWM_MASK;
144 ret |= buf[1] & LED_PWM_MASK;
145 ret |= buf[2] & LED_PWM_MASK;
147 /* unset current since no led is lighting */
148 pm860x_set_bits(led->i2c, __led_off(led->port),
149 LED_CURRENT_MASK, 0);
150 mask = __blink_ctl_mask(led->port);
151 pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0);
154 led->current_brightness = led->brightness;
155 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
156 __led_off(led->port), led->brightness);
157 mutex_unlock(&led->lock);
160 static void pm860x_led_set(struct led_classdev *cdev,
161 enum led_brightness value)
163 struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
165 data->brightness = value >> 3;
166 schedule_work(&data->work);
169 static int pm860x_led_probe(struct platform_device *pdev)
171 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
172 struct pm860x_led_pdata *pdata;
173 struct pm860x_led *data;
174 struct mfd_cell *cell;
175 struct resource *res;
178 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
180 dev_err(&pdev->dev, "No I/O resource!\n");
184 cell = pdev->dev.platform_data;
187 pdata = cell->mfd_data;
189 dev_err(&pdev->dev, "No platform data!\n");
193 data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
196 strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
197 dev_set_drvdata(&pdev->dev, data);
199 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
200 data->iset = pdata->iset;
201 data->port = pdata->flags;
202 if (data->port < 0) {
203 dev_err(&pdev->dev, "check device failed\n");
208 data->current_brightness = 0;
209 data->cdev.name = data->name;
210 data->cdev.brightness_set = pm860x_led_set;
211 mutex_init(&data->lock);
212 INIT_WORK(&data->work, pm860x_led_work);
214 ret = led_classdev_register(chip->dev, &data->cdev);
216 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
219 pm860x_led_set(&data->cdev, 0);
226 static int pm860x_led_remove(struct platform_device *pdev)
228 struct pm860x_led *data = platform_get_drvdata(pdev);
230 led_classdev_unregister(&data->cdev);
236 static struct platform_driver pm860x_led_driver = {
238 .name = "88pm860x-led",
239 .owner = THIS_MODULE,
241 .probe = pm860x_led_probe,
242 .remove = pm860x_led_remove,
245 static int __devinit pm860x_led_init(void)
247 return platform_driver_register(&pm860x_led_driver);
249 module_init(pm860x_led_init);
251 static void __devexit pm860x_led_exit(void)
253 platform_driver_unregister(&pm860x_led_driver);
255 module_exit(pm860x_led_exit);
257 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
258 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
259 MODULE_LICENSE("GPL");
260 MODULE_ALIAS("platform:88pm860x-led");