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 __devinit da903x_led_probe(struct platform_device *pdev) 95 { 96 struct led_info *pdata = pdev->dev.platform_data; 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 = kzalloc(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 goto err; 133 } 134 135 platform_set_drvdata(pdev, led); 136 return 0; 137 138 err: 139 kfree(led); 140 return ret; 141 } 142 143 static int __devexit da903x_led_remove(struct platform_device *pdev) 144 { 145 struct da903x_led *led = platform_get_drvdata(pdev); 146 147 led_classdev_unregister(&led->cdev); 148 kfree(led); 149 return 0; 150 } 151 152 static struct platform_driver da903x_led_driver = { 153 .driver = { 154 .name = "da903x-led", 155 .owner = THIS_MODULE, 156 }, 157 .probe = da903x_led_probe, 158 .remove = __devexit_p(da903x_led_remove), 159 }; 160 161 module_platform_driver(da903x_led_driver); 162 163 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034"); 164 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>" 165 "Mike Rapoport <mike@compulab.co.il>"); 166 MODULE_LICENSE("GPL"); 167 MODULE_ALIAS("platform:da903x-led"); 168