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, *np;
 132         int iset = 0;
 133
 134         nproot = of_node_get(pdev->dev.parent->of_node);
 135         if (!nproot)
 136                 return -ENODEV;
 137         nproot = of_find_node_by_name(nproot, "leds");
 138         if (!nproot) {
 139                 dev_err(&pdev->dev, "failed to find leds node\n");
 140                 return -ENODEV;
 141         }
 142         for_each_child_of_node(nproot, np) {
 143                 if (!of_node_cmp(np->name, data->name)) {
 144                         of_property_read_u32(np, "marvell,88pm860x-iset",
 145                                              &iset);
 146                         data->iset = PM8606_LED_CURRENT(iset);
 147                         break;
 148                 }
 149         }
 150         of_node_put(nproot);
 151         return 0;
 152 }
 153 #else
 154 #define pm860x_led_dt_init(x, y)        (-1)
 155 #endif
 156
 157 static int pm860x_led_probe(struct platform_device *pdev)
 158 {
 159         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 160         struct pm860x_led_pdata *pdata = pdev->dev.platform_data;
 161         struct pm860x_led *data;
 162         struct resource *res;
 163         int ret = 0;
 164
 165         data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
 166         if (data == NULL)
 167                 return -ENOMEM;
 168         res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
 169         if (!res) {
 170                 dev_err(&pdev->dev, "No REG resource for control\n");
 171                 return -ENXIO;
 172         }
 173         data->reg_control = res->start;
 174         res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
 175         if (!res) {
 176                 dev_err(&pdev->dev, "No REG resource for blink\n");
 177                 return -ENXIO;
 178         }
 179         data->reg_blink = res->start;
 180         memset(data->name, 0, MFD_NAME_SIZE);
 181         switch (pdev->id) {
 182         case 0:
 183                 data->blink_mask = LED1_BLINK_EN;
 184                 sprintf(data->name, "led0-red");
 185                 break;
 186         case 1:
 187                 data->blink_mask = LED1_BLINK_EN;
 188                 sprintf(data->name, "led0-green");
 189                 break;
 190         case 2:
 191                 data->blink_mask = LED1_BLINK_EN;
 192                 sprintf(data->name, "led0-blue");
 193                 break;
 194         case 3:
 195                 data->blink_mask = LED2_BLINK_EN;
 196                 sprintf(data->name, "led1-red");
 197                 break;
 198         case 4:
 199                 data->blink_mask = LED2_BLINK_EN;
 200                 sprintf(data->name, "led1-green");
 201                 break;
 202         case 5:
 203                 data->blink_mask = LED2_BLINK_EN;
 204                 sprintf(data->name, "led1-blue");
 205                 break;
 206         }
 207         dev_set_drvdata(&pdev->dev, data);
 208         data->chip = chip;
 209         data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
 210         data->port = pdev->id;
 211         if (pm860x_led_dt_init(pdev, data))
 212                 if (pdata)
 213                         data->iset = pdata->iset;
 214
 215         data->current_brightness = 0;
 216         data->cdev.name = data->name;
 217         data->cdev.brightness_set = pm860x_led_set;
 218         mutex_init(&data->lock);
 219         INIT_WORK(&data->work, pm860x_led_work);
 220
 221         ret = led_classdev_register(chip->dev, &data->cdev);
 222         if (ret < 0) {
 223                 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 224                 return ret;
 225         }
 226         pm860x_led_set(&data->cdev, 0);
 227         return 0;
 228 }
 229
 230 static int pm860x_led_remove(struct platform_device *pdev)
 231 {
 232         struct pm860x_led *data = platform_get_drvdata(pdev);
 233
 234         led_classdev_unregister(&data->cdev);
 235
 236         return 0;
 237 }
 238
 239 static struct platform_driver pm860x_led_driver = {
 240         .driver = {
 241                 .name   = "88pm860x-led",
 242                 .owner  = THIS_MODULE,
 243         },
 244         .probe  = pm860x_led_probe,
 245         .remove = pm860x_led_remove,
 246 };
 247
 248 module_platform_driver(pm860x_led_driver);
 249
 250 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
 251 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 252 MODULE_LICENSE("GPL");
 253 MODULE_ALIAS("platform:88pm860x-led");