linux/drivers/leds/leds-da903x.c
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   1/*
   2 * LEDs driver for Dialog Semiconductor DA9030/DA9034
   3 *
   4 * Copyright (C) 2008 Compulab, Ltd.
   5 *      Mike Rapoport <mike@compulab.co.il>
   6 *
   7 * Copyright (C) 2006-2008 Marvell International Ltd.
   8 *      Eric Miao <eric.miao@marvell.com>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/kernel.h>
  17#include <linux/init.h>
  18#include <linux/platform_device.h>
  19#include <linux/leds.h>
  20#include <linux/workqueue.h>
  21#include <linux/mfd/da903x.h>
  22#include <linux/slab.h>
  23
  24#define DA9030_LED1_CONTROL     0x20
  25#define DA9030_LED2_CONTROL     0x21
  26#define DA9030_LED3_CONTROL     0x22
  27#define DA9030_LED4_CONTROL     0x23
  28#define DA9030_LEDPC_CONTROL    0x24
  29#define DA9030_MISC_CONTROL_A   0x26    /* Vibrator Control */
  30
  31#define DA9034_LED1_CONTROL     0x35
  32#define DA9034_LED2_CONTROL     0x36
  33#define DA9034_VIBRA            0x40
  34
  35struct da903x_led {
  36        struct led_classdev     cdev;
  37        struct work_struct      work;
  38        struct device           *master;
  39        enum led_brightness     new_brightness;
  40        int                     id;
  41        int                     flags;
  42};
  43
  44#define DA9030_LED_OFFSET(id)   ((id) - DA9030_ID_LED_1)
  45#define DA9034_LED_OFFSET(id)   ((id) - DA9034_ID_LED_1)
  46
  47static void da903x_led_work(struct work_struct *work)
  48{
  49        struct da903x_led *led = container_of(work, struct da903x_led, work);
  50        uint8_t val;
  51        int offset;
  52
  53        switch (led->id) {
  54        case DA9030_ID_LED_1:
  55        case DA9030_ID_LED_2:
  56        case DA9030_ID_LED_3:
  57        case DA9030_ID_LED_4:
  58        case DA9030_ID_LED_PC:
  59                offset = DA9030_LED_OFFSET(led->id);
  60                val = led->flags & ~0x87;
  61                val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
  62                val |= (0x7 - (led->new_brightness >> 5)) & 0x7; /* PWM<2:0> */
  63                da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
  64                break;
  65        case DA9030_ID_VIBRA:
  66                val = led->flags & ~0x80;
  67                val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
  68                da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
  69                break;
  70        case DA9034_ID_LED_1:
  71        case DA9034_ID_LED_2:
  72                offset = DA9034_LED_OFFSET(led->id);
  73                val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
  74                val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
  75                da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
  76                break;
  77        case DA9034_ID_VIBRA:
  78                val = led->new_brightness & 0xfe;
  79                da903x_write(led->master, DA9034_VIBRA, val);
  80                break;
  81        }
  82}
  83
  84static void da903x_led_set(struct led_classdev *led_cdev,
  85                           enum led_brightness value)
  86{
  87        struct da903x_led *led;
  88
  89        led = container_of(led_cdev, struct da903x_led, cdev);
  90        led->new_brightness = value;
  91        schedule_work(&led->work);
  92}
  93
  94static int da903x_led_probe(struct platform_device *pdev)
  95{
  96        struct led_info *pdata = pdev->dev.platform_data;
  97        struct da903x_led *led;
  98        int id, ret;
  99
 100        if (pdata == NULL)
 101                return 0;
 102
 103        id = pdev->id;
 104
 105        if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
 106              (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
 107                dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
 108                return -EINVAL;
 109        }
 110
 111        led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
 112        if (led == NULL) {
 113                dev_err(&pdev->dev, "failed to alloc memory for LED%d\n", id);
 114                return -ENOMEM;
 115        }
 116
 117        led->cdev.name = pdata->name;
 118        led->cdev.default_trigger = pdata->default_trigger;
 119        led->cdev.brightness_set = da903x_led_set;
 120        led->cdev.brightness = LED_OFF;
 121
 122        led->id = id;
 123        led->flags = pdata->flags;
 124        led->master = pdev->dev.parent;
 125        led->new_brightness = LED_OFF;
 126
 127        INIT_WORK(&led->work, da903x_led_work);
 128
 129        ret = led_classdev_register(led->master, &led->cdev);
 130        if (ret) {
 131                dev_err(&pdev->dev, "failed to register LED %d\n", id);
 132                return ret;
 133        }
 134
 135        platform_set_drvdata(pdev, led);
 136        return 0;
 137}
 138
 139static int da903x_led_remove(struct platform_device *pdev)
 140{
 141        struct da903x_led *led = platform_get_drvdata(pdev);
 142
 143        led_classdev_unregister(&led->cdev);
 144        return 0;
 145}
 146
 147static struct platform_driver da903x_led_driver = {
 148        .driver = {
 149                .name   = "da903x-led",
 150                .owner  = THIS_MODULE,
 151        },
 152        .probe          = da903x_led_probe,
 153        .remove         = da903x_led_remove,
 154};
 155
 156module_platform_driver(da903x_led_driver);
 157
 158MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
 159MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 160MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
 161MODULE_LICENSE("GPL");
 162MODULE_ALIAS("platform:da903x-led");
 163
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