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| 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/init.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/leds.h> |
| 20 | #include <linux/workqueue.h> |
| 21 | #include <linux/slab.h> |
| 22 | |
| 23 | #include <linux/mfd/da9052/reg.h> |
| 24 | #include <linux/mfd/da9052/da9052.h> |
| 25 | #include <linux/mfd/da9052/pdata.h> |
| 26 | |
| 27 | #define DA9052_OPENDRAIN_OUTPUT 2 |
| 28 | #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) |
| 29 | #define DA9052_MASK_UPPER_NIBBLE 0xF0 |
| 30 | #define DA9052_MASK_LOWER_NIBBLE 0x0F |
| 31 | #define DA9052_NIBBLE_SHIFT 4 |
| 32 | #define DA9052_MAX_BRIGHTNESS 0x5f |
| 33 | |
| 34 | struct da9052_led { |
| 35 | struct led_classdev cdev; |
| 36 | struct work_struct work; |
| 37 | struct da9052 *da9052; |
| 38 | unsigned char led_index; |
| 39 | unsigned char id; |
| 40 | int brightness; |
| 41 | }; |
| 42 | |
| 43 | static unsigned char led_reg[] = { |
| 44 | DA9052_LED_CONT_4_REG, |
| 45 | DA9052_LED_CONT_5_REG, |
| 46 | }; |
| 47 | |
| 48 | static int da9052_set_led_brightness(struct da9052_led *led) |
| 49 | { |
| 50 | u8 val; |
| 51 | int error; |
| 52 | |
| 53 | val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM; |
| 54 | |
| 55 | error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); |
| 56 | if (error < 0) |
| 57 | dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", |
| 58 | error); |
| 59 | return error; |
| 60 | } |
| 61 | |
| 62 | static void da9052_led_work(struct work_struct *work) |
| 63 | { |
| 64 | struct da9052_led *led = container_of(work, struct da9052_led, work); |
| 65 | |
| 66 | da9052_set_led_brightness(led); |
| 67 | } |
| 68 | |
| 69 | static void da9052_led_set(struct led_classdev *led_cdev, |
| 70 | enum led_brightness value) |
| 71 | { |
| 72 | struct da9052_led *led; |
| 73 | |
| 74 | led = container_of(led_cdev, struct da9052_led, cdev); |
| 75 | led->brightness = value; |
| 76 | schedule_work(&led->work); |
| 77 | } |
| 78 | |
| 79 | static int da9052_configure_leds(struct da9052 *da9052) |
| 80 | { |
| 81 | int error; |
| 82 | unsigned char register_value = DA9052_OPENDRAIN_OUTPUT |
| 83 | | DA9052_SET_HIGH_LVL_OUTPUT; |
| 84 | |
| 85 | error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, |
| 86 | DA9052_MASK_LOWER_NIBBLE, |
| 87 | register_value); |
| 88 | |
| 89 | if (error < 0) { |
| 90 | dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", |
| 91 | error); |
| 92 | return error; |
| 93 | } |
| 94 | |
| 95 | error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, |
| 96 | DA9052_MASK_UPPER_NIBBLE, |
| 97 | register_value << DA9052_NIBBLE_SHIFT); |
| 98 | if (error < 0) |
| 99 | dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", |
| 100 | error); |
| 101 | |
| 102 | return error; |
| 103 | } |
| 104 | |
| 105 | static int __devinit da9052_led_probe(struct platform_device *pdev) |
| 106 | { |
| 107 | struct da9052_pdata *pdata; |
| 108 | struct da9052 *da9052; |
| 109 | struct led_platform_data *pled; |
| 110 | struct da9052_led *led = NULL; |
| 111 | int error = -ENODEV; |
| 112 | int i; |
| 113 | |
| 114 | da9052 = dev_get_drvdata(pdev->dev.parent); |
| 115 | pdata = da9052->dev->platform_data; |
| 116 | if (pdata == NULL) { |
| 117 | dev_err(&pdev->dev, "No platform data\n"); |
| 118 | goto err; |
| 119 | } |
| 120 | |
| 121 | pled = pdata->pled; |
| 122 | if (pled == NULL) { |
| 123 | dev_err(&pdev->dev, "No platform data for LED\n"); |
| 124 | goto err; |
| 125 | } |
| 126 | |
| 127 | led = devm_kzalloc(&pdev->dev, |
| 128 | sizeof(struct da9052_led) * pled->num_leds, |
| 129 | GFP_KERNEL); |
| 130 | if (led == NULL) { |
| 131 | dev_err(&pdev->dev, "Failed to alloc memory\n"); |
| 132 | error = -ENOMEM; |
| 133 | goto err; |
| 134 | } |
| 135 | |
| 136 | for (i = 0; i < pled->num_leds; i++) { |
| 137 | led[i].cdev.name = pled->leds[i].name; |
| 138 | led[i].cdev.brightness_set = da9052_led_set; |
| 139 | led[i].cdev.brightness = LED_OFF; |
| 140 | led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; |
| 141 | led[i].brightness = LED_OFF; |
| 142 | led[i].led_index = pled->leds[i].flags; |
| 143 | led[i].da9052 = dev_get_drvdata(pdev->dev.parent); |
| 144 | INIT_WORK(&led[i].work, da9052_led_work); |
| 145 | |
| 146 | error = led_classdev_register(pdev->dev.parent, &led[i].cdev); |
| 147 | if (error) { |
| 148 | dev_err(&pdev->dev, "Failed to register led %d\n", |
| 149 | led[i].led_index); |
| 150 | goto err_register; |
| 151 | } |
| 152 | |
| 153 | error = da9052_set_led_brightness(&led[i]); |
| 154 | if (error) { |
| 155 | dev_err(&pdev->dev, "Unable to init led %d\n", |
| 156 | led[i].led_index); |
| 157 | continue; |
| 158 | } |
| 159 | } |
| 160 | error = da9052_configure_leds(led->da9052); |
| 161 | if (error) { |
| 162 | dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); |
| 163 | goto err_register; |
| 164 | } |
| 165 | |
| 166 | platform_set_drvdata(pdev, led); |
| 167 | |
| 168 | return 0; |
| 169 | |
| 170 | err_register: |
| 171 | for (i = i - 1; i >= 0; i--) { |
| 172 | led_classdev_unregister(&led[i].cdev); |
| 173 | cancel_work_sync(&led[i].work); |
| 174 | } |
| 175 | err: |
| 176 | return error; |
| 177 | } |
| 178 | |
| 179 | static int __devexit da9052_led_remove(struct platform_device *pdev) |
| 180 | { |
| 181 | struct da9052_led *led = platform_get_drvdata(pdev); |
| 182 | struct da9052_pdata *pdata; |
| 183 | struct da9052 *da9052; |
| 184 | struct led_platform_data *pled; |
| 185 | int i; |
| 186 | |
| 187 | da9052 = dev_get_drvdata(pdev->dev.parent); |
| 188 | pdata = da9052->dev->platform_data; |
| 189 | pled = pdata->pled; |
| 190 | |
| 191 | for (i = 0; i < pled->num_leds; i++) { |
| 192 | led[i].brightness = 0; |
| 193 | da9052_set_led_brightness(&led[i]); |
| 194 | led_classdev_unregister(&led[i].cdev); |
| 195 | cancel_work_sync(&led[i].work); |
| 196 | } |
| 197 | |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | static struct platform_driver da9052_led_driver = { |
| 202 | .driver = { |
| 203 | .name = "da9052-leds", |
| 204 | .owner = THIS_MODULE, |
| 205 | }, |
| 206 | .probe = da9052_led_probe, |
| 207 | .remove = __devexit_p(da9052_led_remove), |
| 208 | }; |
| 209 | |
| 210 | module_platform_driver(da9052_led_driver); |
| 211 | |
| 212 | MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); |
| 213 | MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); |
| 214 | MODULE_LICENSE("GPL"); |
| 215 |
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Tags:
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v2.6.34-rc5
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