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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
191 lines
4.4 KiB
C
191 lines
4.4 KiB
C
// 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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