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-lp8788.c (3802B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * TI LP8788 MFD - keyled driver
      4 *
      5 * Copyright 2012 Texas Instruments
      6 *
      7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
      8 */
      9
     10#include <linux/module.h>
     11#include <linux/slab.h>
     12#include <linux/err.h>
     13#include <linux/platform_device.h>
     14#include <linux/leds.h>
     15#include <linux/mutex.h>
     16#include <linux/mfd/lp8788.h>
     17#include <linux/mfd/lp8788-isink.h>
     18
     19#define MAX_BRIGHTNESS			LP8788_ISINK_MAX_PWM
     20#define DEFAULT_LED_NAME		"keyboard-backlight"
     21
     22struct lp8788_led {
     23	struct lp8788 *lp;
     24	struct mutex lock;
     25	struct led_classdev led_dev;
     26	enum lp8788_isink_number isink_num;
     27	int on;
     28};
     29
     30struct lp8788_led_config {
     31	enum lp8788_isink_scale scale;
     32	enum lp8788_isink_number num;
     33	int iout;
     34};
     35
     36static struct lp8788_led_config default_led_config = {
     37	.scale = LP8788_ISINK_SCALE_100mA,
     38	.num   = LP8788_ISINK_3,
     39	.iout  = 0,
     40};
     41
     42static int lp8788_led_init_device(struct lp8788_led *led,
     43				struct lp8788_led_platform_data *pdata)
     44{
     45	struct lp8788_led_config *cfg = &default_led_config;
     46	u8 addr, mask, val;
     47	int ret;
     48
     49	if (pdata) {
     50		cfg->scale = pdata->scale;
     51		cfg->num = pdata->num;
     52		cfg->iout = pdata->iout_code;
     53	}
     54
     55	led->isink_num = cfg->num;
     56
     57	/* scale configuration */
     58	addr = LP8788_ISINK_CTRL;
     59	mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
     60	val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
     61	ret = lp8788_update_bits(led->lp, addr, mask, val);
     62	if (ret)
     63		return ret;
     64
     65	/* current configuration */
     66	addr = lp8788_iout_addr[cfg->num];
     67	mask = lp8788_iout_mask[cfg->num];
     68	val = cfg->iout;
     69
     70	return lp8788_update_bits(led->lp, addr, mask, val);
     71}
     72
     73static int lp8788_led_enable(struct lp8788_led *led,
     74			enum lp8788_isink_number num, int on)
     75{
     76	int ret;
     77
     78	u8 mask = 1 << num;
     79	u8 val = on << num;
     80
     81	ret = lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val);
     82	if (ret == 0)
     83		led->on = on;
     84
     85	return ret;
     86}
     87
     88static int lp8788_brightness_set(struct led_classdev *led_cdev,
     89				enum led_brightness val)
     90{
     91	struct lp8788_led *led =
     92			container_of(led_cdev, struct lp8788_led, led_dev);
     93
     94	enum lp8788_isink_number num = led->isink_num;
     95	int enable, ret;
     96
     97	mutex_lock(&led->lock);
     98
     99	switch (num) {
    100	case LP8788_ISINK_1:
    101	case LP8788_ISINK_2:
    102	case LP8788_ISINK_3:
    103		ret = lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val);
    104		if (ret < 0)
    105			goto unlock;
    106		break;
    107	default:
    108		mutex_unlock(&led->lock);
    109		return -EINVAL;
    110	}
    111
    112	enable = (val > 0) ? 1 : 0;
    113	if (enable != led->on)
    114		ret = lp8788_led_enable(led, num, enable);
    115unlock:
    116	mutex_unlock(&led->lock);
    117	return ret;
    118}
    119
    120static int lp8788_led_probe(struct platform_device *pdev)
    121{
    122	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
    123	struct lp8788_led_platform_data *led_pdata;
    124	struct lp8788_led *led;
    125	struct device *dev = &pdev->dev;
    126	int ret;
    127
    128	led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL);
    129	if (!led)
    130		return -ENOMEM;
    131
    132	led->lp = lp;
    133	led->led_dev.max_brightness = MAX_BRIGHTNESS;
    134	led->led_dev.brightness_set_blocking = lp8788_brightness_set;
    135
    136	led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL;
    137
    138	if (!led_pdata || !led_pdata->name)
    139		led->led_dev.name = DEFAULT_LED_NAME;
    140	else
    141		led->led_dev.name = led_pdata->name;
    142
    143	mutex_init(&led->lock);
    144
    145	ret = lp8788_led_init_device(led, led_pdata);
    146	if (ret) {
    147		dev_err(dev, "led init device err: %d\n", ret);
    148		return ret;
    149	}
    150
    151	ret = devm_led_classdev_register(dev, &led->led_dev);
    152	if (ret) {
    153		dev_err(dev, "led register err: %d\n", ret);
    154		return ret;
    155	}
    156
    157	return 0;
    158}
    159
    160static struct platform_driver lp8788_led_driver = {
    161	.probe = lp8788_led_probe,
    162	.driver = {
    163		.name = LP8788_DEV_KEYLED,
    164	},
    165};
    166module_platform_driver(lp8788_led_driver);
    167
    168MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver");
    169MODULE_AUTHOR("Milo Kim");
    170MODULE_LICENSE("GPL");
    171MODULE_ALIAS("platform:lp8788-keyled");