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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 | /* * LED Driver for Dialog DA9052 PMICs. * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen <dchen@diasemi.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/leds.h> #include <linux/workqueue.h> #include <linux/slab.h> #include <linux/mfd/da9052/reg.h> #include <linux/mfd/da9052/da9052.h> #include <linux/mfd/da9052/pdata.h> #define DA9052_OPENDRAIN_OUTPUT 2 #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) #define DA9052_MASK_UPPER_NIBBLE 0xF0 #define DA9052_MASK_LOWER_NIBBLE 0x0F #define DA9052_NIBBLE_SHIFT 4 #define DA9052_MAX_BRIGHTNESS 0x5f struct da9052_led { struct led_classdev cdev; struct work_struct work; struct da9052 *da9052; unsigned char led_index; unsigned char id; int brightness; }; static unsigned char led_reg[] = { DA9052_LED_CONT_4_REG, DA9052_LED_CONT_5_REG, }; static int da9052_set_led_brightness(struct da9052_led *led) { u8 val; int error; val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM; error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); if (error < 0) dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", error); return error; } static void da9052_led_work(struct work_struct *work) { struct da9052_led *led = container_of(work, struct da9052_led, work); da9052_set_led_brightness(led); } static void da9052_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct da9052_led *led; led = container_of(led_cdev, struct da9052_led, cdev); led->brightness = value; schedule_work(&led->work); } static int da9052_configure_leds(struct da9052 *da9052) { int error; unsigned char register_value = DA9052_OPENDRAIN_OUTPUT | DA9052_SET_HIGH_LVL_OUTPUT; error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, DA9052_MASK_LOWER_NIBBLE, register_value); if (error < 0) { dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", error); return error; } error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, DA9052_MASK_UPPER_NIBBLE, register_value << DA9052_NIBBLE_SHIFT); if (error < 0) dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", error); return error; } static int da9052_led_probe(struct platform_device *pdev) { struct da9052_pdata *pdata; struct da9052 *da9052; struct led_platform_data *pled; struct da9052_led *led = NULL; int error = -ENODEV; int i; da9052 = dev_get_drvdata(pdev->dev.parent); pdata = dev_get_platdata(da9052->dev); if (pdata == NULL) { dev_err(&pdev->dev, "No platform data\n"); goto err; } pled = pdata->pled; if (pled == NULL) { dev_err(&pdev->dev, "No platform data for LED\n"); goto err; } led = devm_kzalloc(&pdev->dev, sizeof(struct da9052_led) * pled->num_leds, GFP_KERNEL); if (led == NULL) { dev_err(&pdev->dev, "Failed to alloc memory\n"); error = -ENOMEM; goto err; } for (i = 0; i < pled->num_leds; i++) { led[i].cdev.name = pled->leds[i].name; led[i].cdev.brightness_set = da9052_led_set; led[i].cdev.brightness = LED_OFF; led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; led[i].brightness = LED_OFF; led[i].led_index = pled->leds[i].flags; led[i].da9052 = dev_get_drvdata(pdev->dev.parent); INIT_WORK(&led[i].work, da9052_led_work); error = led_classdev_register(pdev->dev.parent, &led[i].cdev); if (error) { dev_err(&pdev->dev, "Failed to register led %d\n", led[i].led_index); goto err_register; } error = da9052_set_led_brightness(&led[i]); if (error) { dev_err(&pdev->dev, "Unable to init led %d\n", led[i].led_index); continue; } } error = da9052_configure_leds(led->da9052); if (error) { dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); goto err_register; } platform_set_drvdata(pdev, led); return 0; err_register: for (i = i - 1; i >= 0; i--) { led_classdev_unregister(&led[i].cdev); cancel_work_sync(&led[i].work); } err: return error; } static int da9052_led_remove(struct platform_device *pdev) { struct da9052_led *led = platform_get_drvdata(pdev); struct da9052_pdata *pdata; struct da9052 *da9052; struct led_platform_data *pled; int i; da9052 = dev_get_drvdata(pdev->dev.parent); pdata = dev_get_platdata(da9052->dev); pled = pdata->pled; for (i = 0; i < pled->num_leds; i++) { led[i].brightness = 0; da9052_set_led_brightness(&led[i]); led_classdev_unregister(&led[i].cdev); cancel_work_sync(&led[i].work); } return 0; } static struct platform_driver da9052_led_driver = { .driver = { .name = "da9052-leds", .owner = THIS_MODULE, }, .probe = da9052_led_probe, .remove = da9052_led_remove, }; module_platform_driver(da9052_led_driver); MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); MODULE_LICENSE("GPL"); |