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 = devm_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 return 0; 123 } 124 125 static struct platform_driver da903x_led_driver = { 126 .driver = { 127 .name = "da903x-led", 128 }, 129 .probe = da903x_led_probe, 130 }; 131 132 module_platform_driver(da903x_led_driver); 133 134 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034"); 135 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); 136 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); 137 MODULE_LICENSE("GPL"); 138 MODULE_ALIAS("platform:da903x-led"); 139