// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* LED Driver for Dialog DA9052 PMICs.
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: David Dajun Chen <dchen@diasemi.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <linux/mfd/da9052/reg.h>
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#include <linux/mfd/da9052/da9052.h>
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#include <linux/mfd/da9052/pdata.h>
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#define DA9052_OPENDRAIN_OUTPUT 2
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#define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)
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#define DA9052_MASK_UPPER_NIBBLE 0xF0
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#define DA9052_MASK_LOWER_NIBBLE 0x0F
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#define DA9052_NIBBLE_SHIFT 4
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#define DA9052_MAX_BRIGHTNESS 0x5f
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struct da9052_led {
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struct led_classdev cdev;
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struct da9052 *da9052;
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unsigned char led_index;
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unsigned char id;
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};
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static unsigned char led_reg[] = {
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DA9052_LED_CONT_4_REG,
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DA9052_LED_CONT_5_REG,
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};
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static int da9052_set_led_brightness(struct da9052_led *led,
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enum led_brightness brightness)
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{
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u8 val;
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int error;
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val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;
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error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
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if (error < 0)
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dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
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error);
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return error;
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}
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static int da9052_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct da9052_led *led =
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container_of(led_cdev, struct da9052_led, cdev);
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return da9052_set_led_brightness(led, value);
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}
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static int da9052_configure_leds(struct da9052 *da9052)
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{
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int error;
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unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
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| DA9052_SET_HIGH_LVL_OUTPUT;
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error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
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DA9052_MASK_LOWER_NIBBLE,
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register_value);
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if (error < 0) {
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dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
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error);
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return error;
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}
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error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
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DA9052_MASK_UPPER_NIBBLE,
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register_value << DA9052_NIBBLE_SHIFT);
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if (error < 0)
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dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
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error);
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return error;
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}
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static int da9052_led_probe(struct platform_device *pdev)
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{
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struct da9052_pdata *pdata;
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struct da9052 *da9052;
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struct led_platform_data *pled;
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struct da9052_led *led = NULL;
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int error = -ENODEV;
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int i;
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da9052 = dev_get_drvdata(pdev->dev.parent);
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pdata = dev_get_platdata(da9052->dev);
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if (pdata == NULL) {
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dev_err(&pdev->dev, "No platform data\n");
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goto err;
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}
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pled = pdata->pled;
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if (pled == NULL) {
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dev_err(&pdev->dev, "No platform data for LED\n");
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goto err;
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}
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led = devm_kcalloc(&pdev->dev,
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pled->num_leds, sizeof(struct da9052_led),
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GFP_KERNEL);
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if (!led) {
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error = -ENOMEM;
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goto err;
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}
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for (i = 0; i < pled->num_leds; i++) {
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led[i].cdev.name = pled->leds[i].name;
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led[i].cdev.brightness_set_blocking = da9052_led_set;
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led[i].cdev.brightness = LED_OFF;
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led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
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led[i].led_index = pled->leds[i].flags;
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led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
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error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
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if (error) {
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dev_err(&pdev->dev, "Failed to register led %d\n",
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led[i].led_index);
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goto err_register;
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}
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error = da9052_set_led_brightness(&led[i],
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led[i].cdev.brightness);
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if (error) {
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dev_err(&pdev->dev, "Unable to init led %d\n",
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led[i].led_index);
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continue;
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}
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}
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error = da9052_configure_leds(led->da9052);
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if (error) {
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dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
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goto err_register;
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}
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platform_set_drvdata(pdev, led);
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return 0;
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err_register:
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for (i = i - 1; i >= 0; i--)
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led_classdev_unregister(&led[i].cdev);
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err:
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return error;
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}
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static int da9052_led_remove(struct platform_device *pdev)
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{
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struct da9052_led *led = platform_get_drvdata(pdev);
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struct da9052_pdata *pdata;
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struct da9052 *da9052;
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struct led_platform_data *pled;
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int i;
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da9052 = dev_get_drvdata(pdev->dev.parent);
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pdata = dev_get_platdata(da9052->dev);
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pled = pdata->pled;
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for (i = 0; i < pled->num_leds; i++) {
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da9052_set_led_brightness(&led[i], LED_OFF);
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led_classdev_unregister(&led[i].cdev);
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}
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return 0;
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}
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static struct platform_driver da9052_led_driver = {
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.driver = {
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.name = "da9052-leds",
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},
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.probe = da9052_led_probe,
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.remove = da9052_led_remove,
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};
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module_platform_driver(da9052_led_driver);
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MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
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MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
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MODULE_LICENSE("GPL");
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