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 #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 */
  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 */
  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
  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
 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
 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
 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
 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 = devm_kzalloc(&pdev->dev, 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                 return -EINVAL;
 224         }
 225
 226         data->current_brightness = 0;
 227         data->cdev.name = data->name;
 228         data->cdev.brightness_set = pm860x_led_set;
 229         mutex_init(&data->lock);
 230         INIT_WORK(&data->work, pm860x_led_work);
 231
 232         ret = led_classdev_register(chip->dev, &data->cdev);
 233         if (ret < 0) {
 234                 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 235                 return ret;
 236         }
 237         pm860x_led_set(&data->cdev, 0);
 238         return 0;
 239 }
 240
 241 static int pm860x_led_remove(struct platform_device *pdev)
 242 {
 243         struct pm860x_led *data = platform_get_drvdata(pdev);
 244
 245         led_classdev_unregister(&data->cdev);
 246
 247         return 0;
 248 }
 249
 250 static struct platform_driver pm860x_led_driver = {
 251         .driver = {
 252                 .name   = "88pm860x-led",
 253                 .owner  = THIS_MODULE,
 254         },
 255         .probe  = pm860x_led_probe,
 256         .remove = pm860x_led_remove,
 257 };
 258
 259 module_platform_driver(pm860x_led_driver);
 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");