drivers/leds/leds-88pm860x.c

   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         unsigned char buf[3];
 122         int mask, ret;
 123
 124         led = container_of(work, struct pm860x_led, work);
 125         chip = led->chip;
 126         mutex_lock(&led->lock);
 127         if ((led->current_brightness == 0) && led->brightness) {
 128                 if (led->iset) {
 129                         pm860x_set_bits(led->i2c, __led_off(led->port),
 130                                         LED_CURRENT_MASK, led->iset);
 131                 }
 132                 pm860x_set_bits(led->i2c, __blink_off(led->port),
 133                                 LED_BLINK_MASK, LED_ON_CONTINUOUS);
 134                 mask = __blink_ctl_mask(led->port);
 135                 pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
 136         }
 137         pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
 138                         led->brightness);
 139
 140         if (led->brightness == 0) {
 141                 pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf);
 142                 ret = buf[0] & LED_PWM_MASK;
 143                 ret |= buf[1] & LED_PWM_MASK;
 144                 ret |= buf[2] & LED_PWM_MASK;
 145                 if (ret == 0) {
 146                         /* unset current since no led is lighting */
 147                         pm860x_set_bits(led->i2c, __led_off(led->port),
 148                                         LED_CURRENT_MASK, 0);
 149                         mask = __blink_ctl_mask(led->port);
 150                         pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0);
 151                 }
 152         }
 153         led->current_brightness = led->brightness;
 154         dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
 155                 __led_off(led->port), led->brightness);
 156         mutex_unlock(&led->lock);
 157 }
 158
 159 static void pm860x_led_set(struct led_classdev *cdev,
 160                            enum led_brightness value)
 161 {
 162         struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
 163
 164         data->brightness = value >> 3;
 165         schedule_work(&data->work);
 166 }
 167
 168 static int pm860x_led_probe(struct platform_device *pdev)
 169 {
 170         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 171         struct pm860x_led_pdata *pdata;
 172         struct pm860x_led *data;
 173         struct resource *res;
 174         int ret;
 175
 176         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 177         if (res == NULL) {
 178                 dev_err(&pdev->dev, "No I/O resource!\n");
 179                 return -EINVAL;
 180         }
 181
 182         pdata = pdev->dev.platform_data;
 183         if (pdata == NULL) {
 184                 dev_err(&pdev->dev, "No platform data!\n");
 185                 return -EINVAL;
 186         }
 187
 188         data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
 189         if (data == NULL)
 190                 return -ENOMEM;
 191         strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
 192         dev_set_drvdata(&pdev->dev, data);
 193         data->chip = chip;
 194         data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
 195         data->iset = pdata->iset;
 196         data->port = pdata->flags;
 197         if (data->port < 0) {
 198                 dev_err(&pdev->dev, "check device failed\n");
 199                 kfree(data);
 200                 return -EINVAL;
 201         }
 202
 203         data->current_brightness = 0;
 204         data->cdev.name = data->name;
 205         data->cdev.brightness_set = pm860x_led_set;
 206         mutex_init(&data->lock);
 207         INIT_WORK(&data->work, pm860x_led_work);
 208
 209         ret = led_classdev_register(chip->dev, &data->cdev);
 210         if (ret < 0) {
 211                 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 212                 goto out;
 213         }
 214         pm860x_led_set(&data->cdev, 0);
 215         return 0;
 216 out:
 217         kfree(data);
 218         return ret;
 219 }
 220
 221 static int pm860x_led_remove(struct platform_device *pdev)
 222 {
 223         struct pm860x_led *data = platform_get_drvdata(pdev);
 224
 225         led_classdev_unregister(&data->cdev);
 226         kfree(data);
 227
 228         return 0;
 229 }
 230
 231 static struct platform_driver pm860x_led_driver = {
 232         .driver = {
 233                 .name   = "88pm860x-led",
 234                 .owner  = THIS_MODULE,
 235         },
 236         .probe  = pm860x_led_probe,
 237         .remove = pm860x_led_remove,
 238 };
 239
 240 static int __devinit pm860x_led_init(void)
 241 {
 242         return platform_driver_register(&pm860x_led_driver);
 243 }
 244 module_init(pm860x_led_init);
 245
 246 static void __devexit pm860x_led_exit(void)
 247 {
 248         platform_driver_unregister(&pm860x_led_driver);
 249 }
 250 module_exit(pm860x_led_exit);
 251
 252 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
 253 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 254 MODULE_LICENSE("GPL");
 255 MODULE_ALIAS("platform:88pm860x-led");