linux/drivers/leds/leds-88pm860x.c
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   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
  34struct 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
  52static 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
  73static 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
 118static 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
 128static 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
 157static 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        platform_set_drvdata(pdev, 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
 230static 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
 239static 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
 248module_platform_driver(pm860x_led_driver);
 249
 250MODULE_DESCRIPTION("LED driver for Marvell PM860x");
 251MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 252MODULE_LICENSE("GPL");
 253MODULE_ALIAS("platform:88pm860x-led");
 254
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