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 = devm_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 return 0; 120 } 121 122 static struct platform_driver da903x_led_driver = { 123 .driver = { 124 .name = "da903x-led", 125 }, 126 .probe = da903x_led_probe, 127 }; 128 129 module_platform_driver(da903x_led_driver); 130 131 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034"); 132 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); 133 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); 134 MODULE_LICENSE("GPL"); 135 MODULE_ALIAS("platform:da903x-led"); 136