path: root/drivers/leds/flash/leds-qcom-flash.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2022, 2024-2025 Qualcomm Innovation Center, Inc. All rights reserved.
 */

#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/leds.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <media/v4l2-flash-led-class.h>

/* registers definitions */
#define FLASH_REVISION_REG		0x00
#define FLASH_4CH_REVISION_V0P1		0x01

#define FLASH_TYPE_REG			0x04
#define FLASH_TYPE_VAL			0x18

#define FLASH_SUBTYPE_REG		0x05
#define FLASH_SUBTYPE_3CH_PM8150_VAL	0x04
#define FLASH_SUBTYPE_3CH_PMI8998_VAL	0x03
#define FLASH_SUBTYPE_4CH_VAL		0x07

#define FLASH_STS_3CH_OTST1		BIT(0)
#define FLASH_STS_3CH_OTST2		BIT(1)
#define FLASH_STS_3CH_OTST3		BIT(2)
#define FLASH_STS_3CH_BOB_THM_OVERLOAD	BIT(3)
#define FLASH_STS_3CH_VPH_DROOP		BIT(4)
#define FLASH_STS_3CH_BOB_ILIM_S1	BIT(5)
#define FLASH_STS_3CH_BOB_ILIM_S2	BIT(6)
#define FLASH_STS_3CH_BCL_IBAT		BIT(7)

#define FLASH_STS_4CH_VPH_LOW		BIT(0)
#define FLASH_STS_4CH_BCL_IBAT		BIT(1)
#define FLASH_STS_4CH_BOB_ILIM_S1	BIT(2)
#define FLASH_STS_4CH_BOB_ILIM_S2	BIT(3)
#define FLASH_STS_4CH_OTST2		BIT(4)
#define FLASH_STS_4CH_OTST1		BIT(5)
#define FLASH_STS_4CHG_BOB_THM_OVERLOAD	BIT(6)

#define FLASH_TIMER_EN_BIT		BIT(7)
#define FLASH_TIMER_VAL_MASK		GENMASK(6, 0)
#define FLASH_TIMER_STEP_MS		10

#define FLASH_STROBE_HW_SW_SEL_BIT	BIT(2)
#define SW_STROBE_VAL			0
#define HW_STROBE_VAL			1
#define FLASH_HW_STROBE_TRIGGER_SEL_BIT	BIT(1)
#define STROBE_LEVEL_TRIGGER_VAL	0
#define STROBE_EDGE_TRIGGER_VAL		1
#define FLASH_STROBE_POLARITY_BIT	BIT(0)
#define STROBE_ACTIVE_HIGH_VAL		1

#define FLASH_IRES_MASK_4CH		BIT(0)
#define FLASH_IRES_MASK_3CH		GENMASK(1, 0)
#define FLASH_IRES_12P5MA_VAL		0
#define FLASH_IRES_5MA_VAL_4CH		1
#define FLASH_IRES_5MA_VAL_3CH		3

/* constants */
#define FLASH_CURRENT_MAX_UA		1500000
#define TORCH_CURRENT_MAX_UA		500000
#define FLASH_TOTAL_CURRENT_MAX_UA	2000000
#define FLASH_CURRENT_DEFAULT_UA	1000000
#define TORCH_CURRENT_DEFAULT_UA	200000

#define TORCH_IRES_UA			5000
#define FLASH_IRES_UA			12500

#define FLASH_TIMEOUT_MAX_US		1280000
#define FLASH_TIMEOUT_STEP_US		10000

#define UA_PER_MA			1000

/* thermal threshold constants */
#define OTST_3CH_MIN_VAL		3
#define OTST1_4CH_MIN_VAL		0
#define OTST1_4CH_V0P1_MIN_VAL		3
#define OTST2_4CH_MIN_VAL		0

#define OTST1_MAX_CURRENT_MA		1000
#define OTST2_MAX_CURRENT_MA		500
#define OTST3_MAX_CURRENT_MA		200

enum hw_type {
	QCOM_MVFLASH_3CH,
	QCOM_MVFLASH_4CH,
};

enum led_mode {
	FLASH_MODE,
	TORCH_MODE,
};

enum led_strobe {
	SW_STROBE,
	HW_STROBE,
};

enum {
	REG_STATUS1,
	REG_STATUS2,
	REG_STATUS3,
	REG_CHAN_TIMER,
	REG_ITARGET,
	REG_MODULE_EN,
	REG_IRESOLUTION,
	REG_CHAN_STROBE,
	REG_CHAN_EN,
	REG_THERM_THRSH1,
	REG_THERM_THRSH2,
	REG_THERM_THRSH3,
	REG_TORCH_CLAMP,
	REG_MAX_COUNT,
};

static const struct reg_field mvflash_3ch_pmi8998_regs[REG_MAX_COUNT] = {
	[REG_STATUS1]		= REG_FIELD(0x08, 0, 5),
	[REG_STATUS2]		= REG_FIELD(0x09, 0, 7),
	[REG_STATUS3]		= REG_FIELD(0x0a, 0, 7),
	[REG_CHAN_TIMER]	= REG_FIELD_ID(0x40, 0, 7, 3, 1),
	[REG_ITARGET]		= REG_FIELD_ID(0x43, 0, 6, 3, 1),
	[REG_MODULE_EN]		= REG_FIELD(0x46, 7, 7),
	[REG_IRESOLUTION]	= REG_FIELD(0x47, 0, 5),
	[REG_CHAN_STROBE]	= REG_FIELD_ID(0x49, 0, 2, 3, 1),
	[REG_CHAN_EN]		= REG_FIELD(0x4c, 0, 2),
	[REG_THERM_THRSH1]	= REG_FIELD(0x56, 0, 2),
	[REG_THERM_THRSH2]	= REG_FIELD(0x57, 0, 2),
	[REG_THERM_THRSH3]	= REG_FIELD(0x58, 0, 2),
	[REG_TORCH_CLAMP]	= REG_FIELD(0xea, 0, 6),
};

static const struct reg_field mvflash_3ch_regs[REG_MAX_COUNT] = {
	[REG_STATUS1]		= REG_FIELD(0x08, 0, 7),
	[REG_STATUS2]		= REG_FIELD(0x09, 0, 7),
	[REG_STATUS3]		= REG_FIELD(0x0a, 0, 7),
	[REG_CHAN_TIMER]	= REG_FIELD_ID(0x40, 0, 7, 3, 1),
	[REG_ITARGET]		= REG_FIELD_ID(0x43, 0, 6, 3, 1),
	[REG_MODULE_EN]		= REG_FIELD(0x46, 7, 7),
	[REG_IRESOLUTION]	= REG_FIELD(0x47, 0, 5),
	[REG_CHAN_STROBE]	= REG_FIELD_ID(0x49, 0, 2, 3, 1),
	[REG_CHAN_EN]		= REG_FIELD(0x4c, 0, 2),
	[REG_THERM_THRSH1]	= REG_FIELD(0x56, 0, 2),
	[REG_THERM_THRSH2]	= REG_FIELD(0x57, 0, 2),
	[REG_THERM_THRSH3]	= REG_FIELD(0x58, 0, 2),
	[REG_TORCH_CLAMP]	= REG_FIELD(0xec, 0, 6),
};

static const struct reg_field mvflash_4ch_regs[REG_MAX_COUNT] = {
	[REG_STATUS1]		= REG_FIELD(0x06, 0, 7),
	[REG_STATUS2]		= REG_FIELD(0x07, 0, 6),
	[REG_STATUS3]		= REG_FIELD(0x09, 0, 7),
	[REG_CHAN_TIMER]	= REG_FIELD_ID(0x3e, 0, 7, 4, 1),
	[REG_ITARGET]<