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/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
  35 struct 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
  47 static 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
  84 static 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
  94 static int da903x_led_probe(struct platform_device *pdev)
  95 {
  96         struct led_info *pdata = dev_get_platdata(&pdev->dev);
  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
 139 static 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
 147 static 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
 156 module_platform_driver(da903x_led_driver);
 157
 158 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
 159 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 160 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
 161 MODULE_LICENSE("GPL");
 162 MODULE_ALIAS("platform:da903x-led");