1 /* 2 * LED Driver for Dialog DA9052 PMICs. 3 * 4 * Copyright(c) 2012 Dialog Semiconductor Ltd. 5 * 6 * Author: David Dajun Chen <dchen@diasemi.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 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/slab.h> 20 21 #include <linux/mfd/da9052/reg.h> 22 #include <linux/mfd/da9052/da9052.h> 23 #include <linux/mfd/da9052/pdata.h> 24 25 #define DA9052_OPENDRAIN_OUTPUT 2 26 #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) 27 #define DA9052_MASK_UPPER_NIBBLE 0xF0 28 #define DA9052_MASK_LOWER_NIBBLE 0x0F 29 #define DA9052_NIBBLE_SHIFT 4 30 #define DA9052_MAX_BRIGHTNESS 0x5f 31 32 struct da9052_led { 33 struct led_classdev cdev; 34 struct da9052 *da9052; 35 unsigned char led_index; 36 unsigned char id; 37 }; 38 39 static unsigned char led_reg[] = { 40 DA9052_LED_CONT_4_REG, 41 DA9052_LED_CONT_5_REG, 42 }; 43 44 static int da9052_set_led_brightness(struct da9052_led *led, 45 enum led_brightness brightness) 46 { 47 u8 val; 48 int error; 49 50 val = (brightness & 0x7f) | DA9052_LED_CONT_DIM; 51 52 error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); 53 if (error < 0) 54 dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", 55 error); 56 return error; 57 } 58 59 static int da9052_led_set(struct led_classdev *led_cdev, 60 enum led_brightness value) 61 { 62 struct da9052_led *led = 63 container_of(led_cdev, struct da9052_led, cdev); 64 65 return da9052_set_led_brightness(led, value); 66 } 67 68 static int da9052_configure_leds(struct da9052 *da9052) 69 { 70 int error; 71 unsigned char register_value = DA9052_OPENDRAIN_OUTPUT 72 | DA9052_SET_HIGH_LVL_OUTPUT; 73 74 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, 75 DA9052_MASK_LOWER_NIBBLE, 76 register_value); 77 78 if (error < 0) { 79 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", 80 error); 81 return error; 82 } 83 84 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, 85 DA9052_MASK_UPPER_NIBBLE, 86 register_value << DA9052_NIBBLE_SHIFT); 87 if (error < 0) 88 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", 89 error); 90 91 return error; 92 } 93 94 static int da9052_led_probe(struct platform_device *pdev) 95 { 96 struct da9052_pdata *pdata; 97 struct da9052 *da9052; 98 struct led_platform_data *pled; 99 struct da9052_led *led = NULL; 100 int error = -ENODEV; 101 int i; 102 103 da9052 = dev_get_drvdata(pdev->dev.parent); 104 pdata = dev_get_platdata(da9052->dev); 105 if (pdata == NULL) { 106 dev_err(&pdev->dev, "No platform data\n"); 107 goto err; 108 } 109 110 pled = pdata->pled; 111 if (pled == NULL) { 112 dev_err(&pdev->dev, "No platform data for LED\n"); 113 goto err; 114 } 115 116 led = devm_kzalloc(&pdev->dev, 117 sizeof(struct da9052_led) * pled->num_leds, 118 GFP_KERNEL); 119 if (!led) { 120 error = -ENOMEM; 121 goto err; 122 } 123 124 for (i = 0; i < pled->num_leds; i++) { 125 led[i].cdev.name = pled->leds[i].name; 126 led[i].cdev.brightness_set_blocking = da9052_led_set; 127 led[i].cdev.brightness = LED_OFF; 128 led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; 129 led[i].led_index = pled->leds[i].flags; 130 led[i].da9052 = dev_get_drvdata(pdev->dev.parent); 131 132 error = led_classdev_register(pdev->dev.parent, &led[i].cdev); 133 if (error) { 134 dev_err(&pdev->dev, "Failed to register led %d\n", 135 led[i].led_index); 136 goto err_register; 137 } 138 139 error = da9052_set_led_brightness(&led[i], 140 led[i].cdev.brightness); 141 if (error) { 142 dev_err(&pdev->dev, "Unable to init led %d\n", 143 led[i].led_index); 144 continue; 145 } 146 } 147 error = da9052_configure_leds(led->da9052); 148 if (error) { 149 dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); 150 goto err_register; 151 } 152 153 platform_set_drvdata(pdev, led); 154 155 return 0; 156 157 err_register: 158 for (i = i - 1; i >= 0; i--) 159 led_classdev_unregister(&led[i].cdev); 160 err: 161 return error; 162 } 163 164 static int da9052_led_remove(struct platform_device *pdev) 165 { 166 struct da9052_led *led = platform_get_drvdata(pdev); 167 struct da9052_pdata *pdata; 168 struct da9052 *da9052; 169 struct led_platform_data *pled; 170 int i; 171 172 da9052 = dev_get_drvdata(pdev->dev.parent); 173 pdata = dev_get_platdata(da9052->dev); 174 pled = pdata->pled; 175 176 for (i = 0; i < pled->num_leds; i++) { 177 da9052_set_led_brightness(&led[i], LED_OFF); 178 led_classdev_unregister(&led[i].cdev); 179 } 180 181 return 0; 182 } 183 184 static struct platform_driver da9052_led_driver = { 185 .driver = { 186 .name = "da9052-leds", 187 }, 188 .probe = da9052_led_probe, 189 .remove = da9052_led_remove, 190 }; 191 192 module_platform_driver(da9052_led_driver); 193 194 MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); 195 MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); 196 MODULE_LICENSE("GPL"); 197