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Date: Thu, 29 Sep 2022 14:23:40 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Fenglin Wu <quic_fenglinw@...cinc.com>,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
Pavel Machek <pavel@....cz>, Gene Chen <gene_chen@...htek.com>,
Jacek Anaszewski <jacek.anaszewski@...il.com>,
linux-leds@...r.kernel.org
Cc: collinsd@...eaurora.org, subbaram@...eaurora.org
Subject: Re: [PATCH v2 1/2] leds: flash: add driver to support flash LED
module in QCOM PMICs
On 29/09/2022 14:15, Fenglin Wu wrote:
> Add initial driver to support flash LED module found in Qualcomm
> Technologies, Inc. PMICs. The flash module can have 3 or 4 channels
> and each channel can be controlled indepedently and support full scale
> current up to 1.5 A. It also supports connecting two channels together
> to supply one LED component with full scale current up to 2 A. In that
> case, the current will be split on each channel symmetrically and the
> channels will be enabled and disabled at the same time.
>
> Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
> ---
> drivers/leds/flash/Kconfig | 14 +
> drivers/leds/flash/Makefile | 1 +
> drivers/leds/flash/leds-qcom-flash.c | 707 +++++++++++++++++++++++++++
> 3 files changed, 722 insertions(+)
> create mode 100644 drivers/leds/flash/leds-qcom-flash.c
>
> diff --git a/drivers/leds/flash/Kconfig b/drivers/leds/flash/Kconfig
> index d3eb689b193c..92773fa872dc 100644
> --- a/drivers/leds/flash/Kconfig
> +++ b/drivers/leds/flash/Kconfig
> @@ -61,6 +61,20 @@ config LEDS_MT6360
> Independent current sources supply for each flash LED support torch
> and strobe mode.
>
> +config LEDS_QCOM_FLASH
> + tristate "LED support for flash module inside Qualcomm Technologies, Inc. PMIC"
> + depends on MFD_SPMI_PMIC
|| COMPILE_TEST
(and actually test it, e.g. you might need here "select REGMAP")
> + depends on LEDS_CLASS && OF
> + depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
> + help
> + This option enables support for the flash module found in Qualcomm
> + Technologies, Inc. PMICs. The flash module can have 3 or 4 flash LED
> + channels and each channel is programmable to support up to 1.5 A full
> + scale current. It also supports connecting two channels' output together
> + to supply one LED component to achieve current up to 2 A. In such case,
> + the total LED current will be split symmetrically on each channel and
> + they will be enabled/disabled at the same time.
> +
> config LEDS_RT4505
> tristate "LED support for RT4505 flashlight controller"
> depends on I2C && OF
> diff --git a/drivers/leds/flash/Makefile b/drivers/leds/flash/Makefile
> index 0acbddc0b91b..8a60993f1a25 100644
> --- a/drivers/leds/flash/Makefile
> +++ b/drivers/leds/flash/Makefile
> @@ -6,6 +6,7 @@ obj-$(CONFIG_LEDS_AS3645A) += leds-as3645a.o
> obj-$(CONFIG_LEDS_KTD2692) += leds-ktd2692.o
> obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o
> obj-$(CONFIG_LEDS_MAX77693) += leds-max77693.o
> +obj-$(CONFIG_LEDS_QCOM_FLASH) += leds-qcom-flash.o
> obj-$(CONFIG_LEDS_RT4505) += leds-rt4505.o
> obj-$(CONFIG_LEDS_RT8515) += leds-rt8515.o
> obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o
> diff --git a/drivers/leds/flash/leds-qcom-flash.c b/drivers/leds/flash/leds-qcom-flash.c
> new file mode 100644
> index 000000000000..7b941eb769fe
> --- /dev/null
> +++ b/drivers/leds/flash/leds-qcom-flash.c
> @@ -0,0 +1,707 @@
> +//SPDX-License-Identifier: GPL-2.0-only
Missing space after //
> +/*
> + * Copyright (c) 2022 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_TYPE_REG 0x04
> +#define FLASH_TYPE_VAL 0x18
> +
> +#define FLASH_SUBTYPE_REG 0x05
> +#define FLASH_SUBTYPE_3CH_VAL 0x04
> +#define FLASH_SUBTYPE_4CH_VAL 0x07
> +
> +#define FLASH_MODULE_EN_BIT BIT(7)
> +
> +#define FLASH_TIMER_EN_BIT BIT(7)
> +#define FLASH_TIMER_VAL_MASK GENMASK(6, 0)
> +#define FLASH_TIMER_STEP_MS 10
> +
> +#define FLASH_ITARGET_CURRENT_MASK GENMASK(6, 0)
> +
> +#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
> +
> +enum hw_type {
> + QCOM_MVFLASH_3CH,
> + QCOM_MVFLASH_4CH,
> +};
> +
> +enum led_mode {
> + FLASH_MODE,
> + TORCH_MODE,
> +};
> +
> +enum led_strobe {
> + SW_STROBE,
> + HW_STROBE,
> +};
> +
> +struct qcom_flash_reg {
> + u8 module_en;
> + u8 chan_timer;
> + u8 itarget;
> + u8 iresolution;
> + u8 chan_strobe;
> + u8 chan_en;
> + u8 status1;
> + u8 status2;
> + u8 status3;
> +};
> +
> +struct qcom_flash_led {
> + struct qcom_flash_chip *chip;
> + struct led_classdev_flash flash;
> + struct v4l2_flash *v4l2_flash;
> + u32 max_flash_current_ma;
> + u32 max_torch_current_ma;
> + u32 max_timeout_ms;
> + u32 flash_current_ma;
> + u32 flash_timeout_ms;
> + u8 *chan_id;
> + u8 chan_count;
> + bool enabled;
> +};
> +
> +struct qcom_flash_chip {
> + struct qcom_flash_led *leds;
> + const struct qcom_flash_reg *reg;
> + struct device *dev;
> + struct regmap *regmap;
> + struct mutex lock;
> + enum hw_type hw_type;
> + u32 reg_base;
> + u8 leds_count;
> + u8 max_channels;
> + u8 chan_en_bits;
> +};
> +
> +static const struct qcom_flash_reg mvflash_3ch_reg = {
> + .chan_timer = 0x40,
> + .itarget = 0x43,
> + .module_en = 0x46,
> + .iresolution = 0x47,
> + .chan_strobe = 0x49,
> + .chan_en = 0x4c,
> + .status1 = 0x08,
> + .status2 = 0x09,
> + .status3 = 0x0a,
> +};
> +
> +static const struct qcom_flash_reg mvflash_4ch_reg = {
> + .chan_timer = 0x3e,
> + .itarget = 0x42,
> + .module_en = 0x46,
> + .iresolution = 0x49,
> + .chan_strobe = 0x4a,
> + .chan_en = 0x4e,
> + .status1 = 0x06,
> + .status2 = 0x07,
> + .status3 = 0x09,
Don't reinvent the wheel. Use regmap fields.
> +};
> +
> +static int __set_flash_module_en(struct qcom_flash_led *led, bool en)
Drop __ prefix here and in other functions.
(...)
> +
> +static int qcom_flash_led_remove(struct platform_device *pdev)
> +{
> + struct qcom_flash_chip *chip = platform_get_drvdata(pdev);
> +
> + while (chip->leds_count--)
> + v4l2_flash_release(chip->leds[chip->leds_count].v4l2_flash);
> +
> + mutex_destroy(&chip->lock);
> + return 0;
> +}
> +
> +static const struct of_device_id qcom_flash_led_match_table[] = {
> + { .compatible = "qcom,spmi-flash-led" },
Only this one is needed. Remove the rest:
> + { .compatible = "qcom,pm8150c-flash-led" },
> + { .compatible = "qcom,pm8150l-flash-led" },
> + { .compatible = "qcom,pm8350c-flash-led" },
Best regards,
Krzysztof
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