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