drivers/leds/leds-da903x.c

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