cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

leds-da9052.c (4527B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      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	2
     21#define DA9052_SET_HIGH_LVL_OUTPUT	(1 << 3)
     22#define DA9052_MASK_UPPER_NIBBLE	0xF0
     23#define DA9052_MASK_LOWER_NIBBLE	0x0F
     24#define DA9052_NIBBLE_SHIFT		4
     25#define DA9052_MAX_BRIGHTNESS		0x5f
     26
     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_OUTPUT
     67				       | 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 int 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	return 0;
    177}
    178
    179static struct platform_driver da9052_led_driver = {
    180	.driver		= {
    181		.name	= "da9052-leds",
    182	},
    183	.probe		= da9052_led_probe,
    184	.remove		= da9052_led_remove,
    185};
    186
    187module_platform_driver(da9052_led_driver);
    188
    189MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
    190MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
    191MODULE_LICENSE("GPL");