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"); 159