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/workqueue.h> 20 #include <linux/slab.h> 21 22 #include <linux/mfd/da9052/reg.h> 23 #include <linux/mfd/da9052/da9052.h> 24 #include <linux/mfd/da9052/pdata.h> 25 26 #define DA9052_OPENDRAIN_OUTPUT 2 27 #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) 28 #define DA9052_MASK_UPPER_NIBBLE 0xF0 29 #define DA9052_MASK_LOWER_NIBBLE 0x0F 30 #define DA9052_NIBBLE_SHIFT 4 31 #define DA9052_MAX_BRIGHTNESS 0x5f 32 33 struct da9052_led { 34 struct led_classdev cdev; 35 struct work_struct work; 36 struct da9052 *da9052; 37 unsigned char led_index; 38 unsigned char id; 39 int brightness; 40 }; 41 42 static unsigned char led_reg[] = { 43 DA9052_LED_CONT_4_REG, 44 DA9052_LED_CONT_5_REG, 45 }; 46 47 static int da9052_set_led_brightness(struct da9052_led *led) 48 { 49 u8 val; 50 int error; 51 52 val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM; 53 54 error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); 55 if (error < 0) 56 dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", 57 error); 58 return error; 59 } 60 61 static void da9052_led_work(struct work_struct *work) 62 { 63 struct da9052_led *led = container_of(work, struct da9052_led, work); 64 65 da9052_set_led_brightness(led); 66 } 67 68 static void da9052_led_set(struct led_classdev *led_cdev, 69 enum led_brightness value) 70 { 71 struct da9052_led *led; 72 73 led = container_of(led_cdev, struct da9052_led, cdev); 74 led->brightness = value; 75 schedule_work(&led->work); 76 } 77 78 static int da9052_configure_leds(struct da9052 *da9052) 79 { 80 int error; 81 unsigned char register_value = DA9052_OPENDRAIN_OUTPUT 82 | DA9052_SET_HIGH_LVL_OUTPUT; 83 84 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, 85 DA9052_MASK_LOWER_NIBBLE, 86 register_value); 87 88 if (error < 0) { 89 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", 90 error); 91 return error; 92 } 93 94 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, 95 DA9052_MASK_UPPER_NIBBLE, 96 register_value << DA9052_NIBBLE_SHIFT); 97 if (error < 0) 98 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", 99 error); 100 101 return error; 102 } 103 104 static int da9052_led_probe(struct platform_device *pdev) 105 { 106 struct da9052_pdata *pdata; 107 struct da9052 *da9052; 108 struct led_platform_data *pled; 109 struct da9052_led *led = NULL; 110 int error = -ENODEV; 111 int i; 112 113 da9052 = dev_get_drvdata(pdev->dev.parent); 114 pdata = dev_get_platdata(da9052->dev); 115 if (pdata == NULL) { 116 dev_err(&pdev->dev, "No platform data\n"); 117 goto err; 118 } 119 120 pled = pdata->pled; 121 if (pled == NULL) { 122 dev_err(&pdev->dev, "No platform data for LED\n"); 123 goto err; 124 } 125 126 led = devm_kzalloc(&pdev->dev, 127 sizeof(struct da9052_led) * pled->num_leds, 128 GFP_KERNEL); 129 if (!led) { 130 error = -ENOMEM; 131 goto err; 132 } 133 134 for (i = 0; i < pled->num_leds; i++) { 135 led[i].cdev.name = pled->leds[i].name; 136 led[i].cdev.brightness_set = da9052_led_set; 137 led[i].cdev.brightness = LED_OFF; 138 led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; 139 led[i].brightness = LED_OFF; 140 led[i].led_index = pled->leds[i].flags; 141 led[i].da9052 = dev_get_drvdata(pdev->dev.parent); 142 INIT_WORK(&led[i].work, da9052_led_work); 143 144 error = led_classdev_register(pdev->dev.parent, &led[i].cdev); 145 if (error) { 146 dev_err(&pdev->dev, "Failed to register led %d\n", 147 led[i].led_index); 148 goto err_register; 149 } 150 151 error = da9052_set_led_brightness(&led[i]); 152 if (error) { 153 dev_err(&pdev->dev, "Unable to init led %d\n", 154 led[i].led_index); 155 continue; 156 } 157 } 158 error = da9052_configure_leds(led->da9052); 159 if (error) { 160 dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); 161 goto err_register; 162 } 163 164 platform_set_drvdata(pdev, led); 165 166 return 0; 167 168 err_register: 169 for (i = i - 1; i >= 0; i--) { 170 led_classdev_unregister(&led[i].cdev); 171 cancel_work_sync(&led[i].work); 172 } 173 err: 174 return error; 175 } 176 177 static int da9052_led_remove(struct platform_device *pdev) 178 { 179 struct da9052_led *led = platform_get_drvdata(pdev); 180 struct da9052_pdata *pdata; 181 struct da9052 *da9052; 182 struct led_platform_data *pled; 183 int i; 184 185 da9052 = dev_get_drvdata(pdev->dev.parent); 186 pdata = dev_get_platdata(da9052->dev); 187 pled = pdata->pled; 188 189 for (i = 0; i < pled->num_leds; i++) { 190 led[i].brightness = 0; 191 da9052_set_led_brightness(&led[i]); 192 led_classdev_unregister(&led[i].cdev); 193 cancel_work_sync(&led[i].work); 194 } 195 196 return 0; 197 } 198 199 static struct platform_driver da9052_led_driver = { 200 .driver = { 201 .name = "da9052-leds", 202 }, 203 .probe = da9052_led_probe, 204 .remove = da9052_led_remove, 205 }; 206 207 module_platform_driver(da9052_led_driver); 208 209 MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); 210 MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); 211 MODULE_LICENSE("GPL"); 212