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/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/i2c.h>
  18 #include <linux/leds.h>
  19 #include <linux/slab.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/mfd/88pm860x.h>
  22 #include <linux/module.h>
  23
  24 #define LED_PWM_MASK            (0x1F)
  25 #define LED_CURRENT_MASK        (0x07 << 5)
  26
  27 #define LED_BLINK_MASK          (0x7F)
  28
  29 #define LED_ON_CONTINUOUS       (0x0F << 3)
  30
  31 #define LED1_BLINK_EN           (1 << 1)
  32 #define LED2_BLINK_EN           (1 << 2)
  33
  34 struct pm860x_led {
  35         struct led_classdev cdev;
  36         struct i2c_client *i2c;
  37         struct work_struct work;
  38         struct pm860x_chip *chip;
  39         struct mutex lock;
  40         char name[MFD_NAME_SIZE];
  41
  42         int port;
  43         int iset;
  44         unsigned char brightness;
  45         unsigned char current_brightness;
  46
  47         int reg_control;
  48         int reg_blink;
  49         int blink_mask;
  50 };
  51
  52 static int led_power_set(struct pm860x_chip *chip, int port, int on)
  53 {
  54         int ret = -EINVAL;
  55
  56         switch (port) {
  57         case 0:
  58         case 1:
  59         case 2:
  60                 ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
  61                         pm8606_osc_disable(chip, RGB1_ENABLE);
  62                 break;
  63         case 3:
  64         case 4:
  65         case 5:
  66                 ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
  67                         pm8606_osc_disable(chip, RGB2_ENABLE);
  68                 break;
  69         }
  70         return ret;
  71 }
  72
  73 static void pm860x_led_work(struct work_struct *work)
  74 {
  75
  76         struct pm860x_led *led;
  77         struct pm860x_chip *chip;
  78         unsigned char buf[3];
  79         int ret;
  80
  81         led = container_of(work, struct pm860x_led, work);
  82         chip = led->chip;
  83         mutex_lock(&led->lock);
  84         if ((led->current_brightness == 0) && led->brightness) {
  85                 led_power_set(chip, led->port, 1);
  86                 if (led->iset) {
  87                         pm860x_set_bits(led->i2c, led->reg_control,
  88                                         LED_CURRENT_MASK, led->iset);
  89                 }
  90                 pm860x_set_bits(led->i2c, led->reg_blink,
  91                                 LED_BLINK_MASK, LED_ON_CONTINUOUS);
  92                 pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
  93                                 led->blink_mask);
  94         }
  95         pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
  96                         led->brightness);
  97
  98         if (led->brightness == 0) {
  99                 pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
 100                 ret = buf[0] & LED_PWM_MASK;
 101                 ret |= buf[1] & LED_PWM_MASK;
 102                 ret |= buf[2] & LED_PWM_MASK;
 103                 if (ret == 0) {
 104                         /* unset current since no led is lighting */
 105                         pm860x_set_bits(led->i2c, led->reg_control,
 106                                         LED_CURRENT_MASK, 0);
 107                         pm860x_set_bits(led->i2c, PM8606_WLED3B,
 108                                         led->blink_mask, 0);
 109                         led_power_set(chip, led->port, 0);
 110                 }
 111         }
 112         led->current_brightness = led->brightness;
 113         dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
 114                 led->reg_control, led->brightness);
 115         mutex_unlock(&led->lock);
 116 }
 117
 118 static void pm860x_led_set(struct led_classdev *cdev,
 119                            enum led_brightness value)
 120 {
 121         struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
 122
 123         data->brightness = value >> 3;
 124         schedule_work(&data->work);
 125 }
 126
 127 #ifdef CONFIG_OF
 128 static int pm860x_led_dt_init(struct platform_device *pdev,
 129                               struct pm860x_led *data)
 130 {
 131         struct device_node *nproot = pdev->dev.parent->of_node, *np;
 132         int iset = 0;
 133         if (!nproot)
 134                 return -ENODEV;
 135         nproot = of_find_node_by_name(nproot, "leds");
 136         if (!nproot) {
 137                 dev_err(&pdev->dev, "failed to find leds node\n");
 138                 return -ENODEV;
 139         }
 140         for_each_child_of_node(nproot, np) {
 141                 if (!of_node_cmp(np->name, data->name)) {
 142                         of_property_read_u32(np, "marvell,88pm860x-iset",
 143                                              &iset);
 144                         data->iset = PM8606_LED_CURRENT(iset);
 145                         break;
 146                 }
 147         }
 148         return 0;
 149 }
 150 #else
 151 #define pm860x_led_dt_init(x, y)        (-1)
 152 #endif
 153
 154 static int pm860x_led_probe(struct platform_device *pdev)
 155 {
 156         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 157         struct pm860x_led_pdata *pdata = pdev->dev.platform_data;
 158         struct pm860x_led *data;
 159         struct resource *res;
 160         int ret = 0;
 161
 162         data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
 163         if (data == NULL)
 164                 return -ENOMEM;
 165         res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
 166         if (!res) {
 167                 dev_err(&pdev->dev, "No REG resource for control\n");
 168                 return -ENXIO;
 169         }
 170         data->reg_control = res->start;
 171         res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
 172         if (!res) {
 173                 dev_err(&pdev->dev, "No REG resource for blink\n");
 174                 return -ENXIO;
 175         }
 176         data->reg_blink = res->start;
 177         memset(data->name, 0, MFD_NAME_SIZE);
 178         switch (pdev->id) {
 179         case 0:
 180                 data->blink_mask = LED1_BLINK_EN;
 181                 sprintf(data->name, "led0-red");
 182                 break;
 183         case 1:
 184                 data->blink_mask = LED1_BLINK_EN;
 185                 sprintf(data->name, "led0-green");
 186                 break;
 187         case 2:
 188                 data->blink_mask = LED1_BLINK_EN;
 189                 sprintf(data->name, "led0-blue");
 190                 break;
 191         case 3:
 192                 data->blink_mask = LED2_BLINK_EN;
 193                 sprintf(data->name, "led1-red");
 194                 break;
 195         case 4:
 196                 data->blink_mask = LED2_BLINK_EN;
 197                 sprintf(data->name, "led1-green");
 198                 break;
 199         case 5:
 200                 data->blink_mask = LED2_BLINK_EN;
 201                 sprintf(data->name, "led1-blue");
 202                 break;
 203         }
 204         dev_set_drvdata(&pdev->dev, data);
 205         data->chip = chip;
 206         data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
 207         data->port = pdev->id;
 208         if (pm860x_led_dt_init(pdev, data))
 209                 if (pdata)
 210                         data->iset = pdata->iset;
 211
 212         data->current_brightness = 0;
 213         data->cdev.name = data->name;
 214         data->cdev.brightness_set = pm860x_led_set;
 215         mutex_init(&data->lock);
 216         INIT_WORK(&data->work, pm860x_led_work);
 217
 218         ret = led_classdev_register(chip->dev, &data->cdev);
 219         if (ret < 0) {
 220                 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 221                 return ret;
 222         }
 223         pm860x_led_set(&data->cdev, 0);
 224         return 0;
 225 }
 226
 227 static int pm860x_led_remove(struct platform_device *pdev)
 228 {
 229         struct pm860x_led *data = platform_get_drvdata(pdev);
 230
 231         led_classdev_unregister(&data->cdev);
 232
 233         return 0;
 234 }
 235
 236 static struct platform_driver pm860x_led_driver = {
 237         .driver = {
 238                 .name   = "88pm860x-led",
 239                 .owner  = THIS_MODULE,
 240         },
 241         .probe  = pm860x_led_probe,
 242         .remove = pm860x_led_remove,
 243 };
 244
 245 module_platform_driver(pm860x_led_driver);
 246
 247 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
 248 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 249 MODULE_LICENSE("GPL");
 250 MODULE_ALIAS("platform:88pm860x-led");