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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * LED Driver for Dialog DA9052 PMICs.4 *5 * Copyright(c) 2012 Dialog Semiconductor Ltd.6 *7 * Author: David Dajun Chen <dchen@diasemi.com>8 */9 10#include <linux/module.h>11#include <linux/kernel.h>12#include <linux/platform_device.h>13#include <linux/leds.h>14#include <linux/slab.h>15 16#include <linux/mfd/da9052/reg.h>17#include <linux/mfd/da9052/da9052.h>18#include <linux/mfd/da9052/pdata.h>19 20#define DA9052_OPENDRAIN_OUTPUT 221#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)22#define DA9052_MASK_UPPER_NIBBLE 0xF023#define DA9052_MASK_LOWER_NIBBLE 0x0F24#define DA9052_NIBBLE_SHIFT 425#define DA9052_MAX_BRIGHTNESS 0x5f26 27struct da9052_led {28 struct led_classdev cdev;29 struct da9052 *da9052;30 unsigned char led_index;31 unsigned char id;32};33 34static unsigned char led_reg[] = {35 DA9052_LED_CONT_4_REG,36 DA9052_LED_CONT_5_REG,37};38 39static int da9052_set_led_brightness(struct da9052_led *led,40 enum led_brightness brightness)41{42 u8 val;43 int error;44 45 val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;46 47 error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);48 if (error < 0)49 dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",50 error);51 return error;52}53 54static int da9052_led_set(struct led_classdev *led_cdev,55 enum led_brightness value)56{57 struct da9052_led *led =58 container_of(led_cdev, struct da9052_led, cdev);59 60 return da9052_set_led_brightness(led, value);61}62 63static int da9052_configure_leds(struct da9052 *da9052)64{65 int error;66 unsigned char register_value = DA9052_OPENDRAIN_OUTPUT67 | DA9052_SET_HIGH_LVL_OUTPUT;68 69 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,70 DA9052_MASK_LOWER_NIBBLE,71 register_value);72 73 if (error < 0) {74 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",75 error);76 return error;77 }78 79 error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,80 DA9052_MASK_UPPER_NIBBLE,81 register_value << DA9052_NIBBLE_SHIFT);82 if (error < 0)83 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",84 error);85 86 return error;87}88 89static int da9052_led_probe(struct platform_device *pdev)90{91 struct da9052_pdata *pdata;92 struct da9052 *da9052;93 struct led_platform_data *pled;94 struct da9052_led *led = NULL;95 int error = -ENODEV;96 int i;97 98 da9052 = dev_get_drvdata(pdev->dev.parent);99 pdata = dev_get_platdata(da9052->dev);100 if (pdata == NULL) {101 dev_err(&pdev->dev, "No platform data\n");102 goto err;103 }104 105 pled = pdata->pled;106 if (pled == NULL) {107 dev_err(&pdev->dev, "No platform data for LED\n");108 goto err;109 }110 111 led = devm_kcalloc(&pdev->dev,112 pled->num_leds, sizeof(struct da9052_led),113 GFP_KERNEL);114 if (!led) {115 error = -ENOMEM;116 goto err;117 }118 119 for (i = 0; i < pled->num_leds; i++) {120 led[i].cdev.name = pled->leds[i].name;121 led[i].cdev.brightness_set_blocking = da9052_led_set;122 led[i].cdev.brightness = LED_OFF;123 led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;124 led[i].led_index = pled->leds[i].flags;125 led[i].da9052 = dev_get_drvdata(pdev->dev.parent);126 127 error = led_classdev_register(pdev->dev.parent, &led[i].cdev);128 if (error) {129 dev_err(&pdev->dev, "Failed to register led %d\n",130 led[i].led_index);131 goto err_register;132 }133 134 error = da9052_set_led_brightness(&led[i],135 led[i].cdev.brightness);136 if (error) {137 dev_err(&pdev->dev, "Unable to init led %d\n",138 led[i].led_index);139 continue;140 }141 }142 error = da9052_configure_leds(led->da9052);143 if (error) {144 dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);145 goto err_register;146 }147 148 platform_set_drvdata(pdev, led);149 150 return 0;151 152err_register:153 for (i = i - 1; i >= 0; i--)154 led_classdev_unregister(&led[i].cdev);155err:156 return error;157}158 159static void da9052_led_remove(struct platform_device *pdev)160{161 struct da9052_led *led = platform_get_drvdata(pdev);162 struct da9052_pdata *pdata;163 struct da9052 *da9052;164 struct led_platform_data *pled;165 int i;166 167 da9052 = dev_get_drvdata(pdev->dev.parent);168 pdata = dev_get_platdata(da9052->dev);169 pled = pdata->pled;170 171 for (i = 0; i < pled->num_leds; i++) {172 da9052_set_led_brightness(&led[i], LED_OFF);173 led_classdev_unregister(&led[i].cdev);174 }175}176 177static struct platform_driver da9052_led_driver = {178 .driver = {179 .name = "da9052-leds",180 },181 .probe = da9052_led_probe,182 .remove_new = da9052_led_remove,183};184 185module_platform_driver(da9052_led_driver);186 187MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");188MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");189MODULE_LICENSE("GPL");190