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