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

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