drivers/leds/leds-da903x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LEDs driver for Dialog Semiconductor DA9030/DA9034
   4  *
   5  * Copyright (C) 2008 Compulab, Ltd.
   6  *      Mike Rapoport <mike@compulab.co.il>
   7  *
   8  * Copyright (C) 2006-2008 Marvell International Ltd.
   9  *      Eric Miao <eric.miao@marvell.com>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/leds.h>
  16 #include <linux/mfd/da903x.h>
  17 #include <linux/slab.h>
  18
  19 #define DA9030_LED1_CONTROL     0x20
  20 #define DA9030_LED2_CONTROL     0x21
  21 #define DA9030_LED3_CONTROL     0x22
  22 #define DA9030_LED4_CONTROL     0x23
  23 #define DA9030_LEDPC_CONTROL    0x24
  24 #define DA9030_MISC_CONTROL_A   0x26    /* Vibrator Control */
  25
  26 #define DA9034_LED1_CONTROL     0x35
  27 #define DA9034_LED2_CONTROL     0x36
  28 #define DA9034_VIBRA            0x40
  29
  30 struct da903x_led {
  31         struct led_classdev     cdev;
  32         struct device           *master;
  33         int                     id;
  34         int                     flags;
  35 };
  36
  37 #define DA9030_LED_OFFSET(id)   ((id) - DA9030_ID_LED_1)
  38 #define DA9034_LED_OFFSET(id)   ((id) - DA9034_ID_LED_1)
  39
  40 static int da903x_led_set(struct led_classdev *led_cdev,
  41                            enum led_brightness value)
  42 {
  43         struct da903x_led *led =
  44                         container_of(led_cdev, struct da903x_led, cdev);
  45         uint8_t val;
  46         int offset, ret = -EINVAL;
  47
  48         switch (led->id) {
  49         case DA9030_ID_LED_1:
  50         case DA9030_ID_LED_2:
  51         case DA9030_ID_LED_3:
  52         case DA9030_ID_LED_4:
  53         case DA9030_ID_LED_PC:
  54                 offset = DA9030_LED_OFFSET(led->id);
  55                 val = led->flags & ~0x87;
  56                 val |= value ? 0x80 : 0; /* EN bit */
  57                 val |= (0x7 - (value >> 5)) & 0x7; /* PWM<2:0> */
  58                 ret = da903x_write(led->master, DA9030_LED1_CONTROL + offset,
  59                                    val);
  60                 break;
  61         case DA9030_ID_VIBRA:
  62                 val = led->flags & ~0x80;
  63                 val |= value ? 0x80 : 0; /* EN bit */
  64                 ret = da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
  65                 break;
  66         case DA9034_ID_LED_1:
  67         case DA9034_ID_LED_2:
  68                 offset = DA9034_LED_OFFSET(led->id);
  69                 val = (value * 0x5f / LED_FULL) & 0x7f;
  70                 val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
  71                 ret = da903x_write(led->master, DA9034_LED1_CONTROL + offset,
  72                                    val);
  73                 break;
  74         case DA9034_ID_VIBRA:
  75                 val = value & 0xfe;
  76                 ret = da903x_write(led->master, DA9034_VIBRA, val);
  77                 break;
  78         }
  79
  80         return ret;
  81 }
  82
  83 static int da903x_led_probe(struct platform_device *pdev)
  84 {
  85         struct led_info *pdata = dev_get_platdata(&pdev->dev);
  86         struct da903x_led *led;
  87         int id, ret;
  88
  89         if (pdata == NULL)
  90                 return 0;
  91
  92         id = pdev->id;
  93
  94         if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
  95               (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
  96                 dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
  97                 return -EINVAL;
  98         }
  99
 100         led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
 101         if (!led)
 102                 return -ENOMEM;
 103
 104         led->cdev.name = pdata->name;
 105         led->cdev.default_trigger = pdata->default_trigger;
 106         led->cdev.brightness_set_blocking = da903x_led_set;
 107         led->cdev.brightness = LED_OFF;
 108
 109         led->id = id;
 110         led->flags = pdata->flags;
 111         led->master = pdev->dev.parent;
 112
 113         ret = led_classdev_register(led->master, &led->cdev);
 114         if (ret) {
 115                 dev_err(&pdev->dev, "failed to register LED %d\n", id);
 116                 return ret;
 117         }
 118
 119         platform_set_drvdata(pdev, led);
 120
 121         return 0;
 122 }
 123
 124 static int da903x_led_remove(struct platform_device *pdev)
 125 {
 126         struct da903x_led *led = platform_get_drvdata(pdev);
 127
 128         led_classdev_unregister(&led->cdev);
 129
 130         return 0;
 131 }
 132
 133 static struct platform_driver da903x_led_driver = {
 134         .driver = {
 135                 .name   = "da903x-led",
 136         },
 137         .probe          = da903x_led_probe,
 138         .remove         = da903x_led_remove,
 139 };
 140
 141 module_platform_driver(da903x_led_driver);
 142
 143 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
 144 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 145 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
 146 MODULE_LICENSE("GPL");
 147 MODULE_ALIAS("platform:da903x-led");