kernel_samsung_a34x-permissive/drivers/misc/mediatek/thermal/mtk_cooler_backlight.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 MediaTek Inc.
 */

#ifdef pr_fmt
#undef pr_fmt
#endif
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/types.h>
#include <linux/kobject.h>

#include "mt-plat/mtk_thermal_monitor.h"

#define mtk_cooler_backlight_dprintk(fmt, args...)	\
	pr_notice("thermal/cooler/backlight " fmt, ##args)

#define BACKLIGHT_COOLER_NR 3

static struct thermal_cooling_device
*cl_backlight_dev[BACKLIGHT_COOLER_NR] = { 0 };

static unsigned int g_cl_backlight_state[BACKLIGHT_COOLER_NR] = { 0 };
extern int mt_leds_max_brightness_set(char *name, int percent, bool enable);

/* static unsigned int g_cl_backlight_last_state[BACKLIGHT_COOLER_NR] = {0}; */
static unsigned int g_cl_id[BACKLIGHT_COOLER_NR];
static unsigned int g_backlight_level;
static unsigned int g_backlight_last_level;


static void mtk_cl_backlight_set_max_brightness_limit(void)
{
	if (g_backlight_last_level != g_backlight_level) {
		mtk_cooler_backlight_dprintk("set brightness level = %d\n",
				g_backlight_level);

		switch (g_backlight_level) {
		case 0:
			/* 100% */
			#if defined(CONFIG_MTK_LEDS) && \
				(defined(CONFIG_LEDS_MTK_DISP) || \
				defined(CONFIG_LEDS_MTK_PWM) || \
				defined(CONFIG_LEDS_MTK_I2C))
			mt_leds_max_brightness_set("lcd-backlight", 100, 0);
			#elif defined(CONFIG_LEDS_MTK_DISP) || \
				  defined(CONFIG_LEDS_MTK_PWM) || \
				  defined(CONFIG_LEDS_MTK_I2C)
			setMaxBrightness("lcd-backlight", 100, 0);
			#else
			setMaxbrightness(255, 0);
			#endif
			break;
		case 1:
			/* 70% */
			#if defined(CONFIG_MTK_LEDS) && \
				(defined(CONFIG_LEDS_MTK_DISP) || \
				defined(CONFIG_LEDS_MTK_PWM) || \
				defined(CONFIG_LEDS_MTK_I2C))
			mt_leds_max_brightness_set("lcd-backlight", 70, 0);
			#elif defined(CONFIG_LEDS_MTK_DISP) || \
				  defined(CONFIG_LEDS_MTK_PWM) || \
				  defined(CONFIG_LEDS_MTK_I2C)
			setMaxBrightness("lcd-backlight", 70, 0);
			#else
			setMaxbrightness(178, 1);
			#endif
			break;
		case 2:
			/* 40% */
			#if defined(CONFIG_MTK_LEDS) && \
				(defined(CONFIG_LEDS_MTK_DISP) || \
				defined(CONFIG_LEDS_MTK_PWM) || \
				defined(CONFIG_LEDS_MTK_I2C))
			mt_leds_max_brightness_set("lcd-backlight", 40, 1);
			#elif defined(CONFIG_LEDS_MTK_DISP) || \
				  defined(CONFIG_LEDS_MTK_PWM) || \
				  defined(CONFIG_LEDS_MTK_I2C)
			setMaxBrightness("lcd-backlight", 40, 1);
			#else
			setMaxbrightness(102, 1);
			#endif
			break;
		case 3:
			/* 10% */
			#if defined(CONFIG_MTK_LEDS) && \
				(defined(CONFIG_LEDS_MTK_DISP) || \
				defined(CONFIG_LEDS_MTK_PWM) || \
				defined(CONFIG_LEDS_MTK_I2C))
			mt_leds_max_brightness_set("lcd-backlight", 10, 1);
			#elif defined(CONFIG_LEDS_MTK_DISP) || \
				  defined(CONFIG_LEDS_MTK_PWM) || \
				  defined(CONFIG_LEDS_MTK_I2C)
			setMaxBrightness("lcd-backlight", 10, 1);
			#else
			setMaxbrightness(25, 1);
			#endif
			break;
		default:
			#if defined(CONFIG_MTK_LEDS) && \
				(defined(CONFIG_LEDS_MTK_DISP) || \
				defined(CONFIG_LEDS_MTK_PWM) || \
				defined(CONFIG_LEDS_MTK_I2C))
			mt_leds_max_brightness_set("lcd-backlight", 100, 0);
			#elif defined(CONFIG_LEDS_MTK_DISP) || \
				  defined(CONFIG_LEDS_MTK_PWM) || \
				  defined(CONFIG_LEDS_MTK_I2C)
			setMaxBrightness("lcd-backlight", 100, 0);
			#else
			setMaxbrightness(255, 0);
			#endif
			break;
		}
	}
}

	static int mtk_cl_backlight_get_max_state
(struct thermal_cooling_device *cdev, unsigned long *state)
{
	*state = 1;
	/* mtk_cooler_backlight_dprintk
	 * ("mtk_cl_backlight_get_max_state() %d\n", *state);
	 */
	return 0;
}

	static int mtk_cl_backlight_get_cur_state
(struct thermal_cooling_device *cdev, unsigned long *state)
{
	int nCoolerId;

	/* Get Cooler ID */
	nCoolerId = *((int *)cdev->devdata);

	*state = g_cl_backlight_state[nCoolerId];
	/* mtk_cooler_backlight_dprintk
	 * ("mtk_cl_backlight_get_cur_state() %d CoolerID:%d\n",
	 * state, nCoolerId);
	 */
	return 0;
}

	static int mtk_cl_backlight_set_cur_state
(struct thermal_cooling_device *cdev, unsigned long state)
{
	int i;
	int nCoolerId;		/* /< Backlight Cooler ID */

	/* Get Cooler ID */
	nCoolerId = *((int *)cdev->devdata);

	/* mtk_cooler_backlight_dprintk
	 * ("mtk_cl_backlight_set_cur_state() %d CoolerID:%d\n",
	 * state, nCoolerId);
	 */

	g_cl_backlight_state[nCoolerId] = state;

	g_backlight_level = 0;
	for (i = 0; i < BACKLIGHT_COOLER_NR; i++)
		g_backlight_level += g_cl_backlight_state[i];

	/* Mark for test */
	/* if(g_backlight_last_level != g_backlight_level) */
	{
		/* send uevent to notify current call must be dropped
		 */
		/* char event[20] = {0}; */
		/* char *envp[] = { event, NULL }; */
		/* sprintf(event, "BACKLIGHT=%d", g_backlight_level);
		 * ///< BACKLIGHT01=1 ...
		 */
		/* kobject_uevent_env
		 * (&(cl_backlight_dev[nCoolerId]->device.kobj),
		 * KOBJ_CHANGE, envp);
		 */

		mtk_cl_backlight_set_max_brightness_limit();

		g_backlight_last_level = g_backlight_level;

		/* mtk_cooler_backlight_dprintk
		 * ("mtk_cl_backlight_set_cur_state()
		 * event:%s g_backlight_level:%d\n",
		 * event, g_backlight_level);
		 */

	}

	return 0;
}

/* bind fan callbacks to fan device */
static struct thermal_cooling_device_ops mtk_cl_backlight_ops = {
	.get_max_state = mtk_cl_backlight_get_max_state,
	.get_cur_state = mtk_cl_backlight_get_cur_state,
	.set_cur_state = mtk_cl_backlight_set_cur_state,
};

static int mtk_cooler_backlight_register_ltf(void)
{
	int i;

	mtk_cooler_backlight_dprintk("register ltf\n");

	for (i = 0; i < BACKLIGHT_COOLER_NR; i++) {
		char temp[20] = { 0 };

		sprintf(temp, "mtk-cl-backlight%02d", i + 1);
		/* /< Cooler Name: mtk-cl-backlight01 */

		g_cl_id[i] = i;
		cl_backlight_dev[i] = mtk_thermal_cooling_device_register
			(temp, (void *)&g_cl_id[i],
			 &mtk_cl_backlight_ops);
	}

	return 0;
}

static void mtk_cooler_backlight_unregister_ltf(void)
{
	int i;

	mtk_cooler_backlight_dprintk("unregister ltf\n");

	for (i = 0; i < BACKLIGHT_COOLER_NR; i++) {
		if (cl_backlight_dev[i]) {
			mtk_thermal_cooling_device_unregister
				(cl_backlight_dev[i]);
			cl_backlight_dev[i] = NULL;
		}
	}
}


static int __init mtk_cooler_backlight_init(void)
{
	int err = 0;

	mtk_cooler_backlight_dprintk("init\n");

	err = mtk_cooler_backlight_register_ltf();
	if (err)
		goto err_unreg;

	return 0;

err_unreg:
	mtk_cooler_backlight_unregister_ltf();
	return err;
}

static void __exit mtk_cooler_backlight_exit(void)
{
	mtk_cooler_backlight_dprintk("exit\n");

	mtk_cooler_backlight_unregister_ltf();
}
module_init(mtk_cooler_backlight_init);
module_exit(mtk_cooler_backlight_exit);