From patchwork Thu Feb 23 11:23:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ChiaEn Wu X-Patchwork-Id: 13150142 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B1D0EC636D6 for ; Thu, 23 Feb 2023 11:25:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=wWK81dJMm7k2aZkSJrSJrbKa8uUxpBMqxx7OOc/DcWI=; b=QI2dloiArWIAOX RCtirOXr/mSA68agt23+hpap1qmSVTZDD1Sx0FMLPACLhckg2/GhB1X7ZFo9zFFMZ5Hyih1T1/SEH BGyzGj5AkCE117gpHhdGv4nZRmCoUiDD1aZI3rcKZbErCF2MBG3+eF0ehqdu7HxAhx1IB5mJMdHTC vWpQ+6lSA03ci8sda2XY6L09mXtZUUsfJH+/Wk9ELFIdCzD6qtzkWrQUtyRR9kNoEMH/quq3kYPSa v0YrwRHSm8sCFublhBEk1FjKAqeZLNeXliD2G08S14oIjnEJU/GdPnd/SCw2CfOXObwqeISKi02Ut d/KO+seKdjBSc1jszqkQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pV9iF-00G8Xf-5D; Thu, 23 Feb 2023 11:24:35 +0000 Received: from mg.richtek.com ([220.130.44.152]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pV9i1-00G8Pm-7F; Thu, 23 Feb 2023 11:24:26 +0000 X-MailGates: (flag:4,DYNAMIC,BADHELO,RELAY,NOHOST:PASS)(compute_score:DE LIVER,40,3) Received: from 192.168.10.46 by mg.richtek.com with MailGates ESMTP Server V5.0(14969:0:AUTH_RELAY) (envelope-from ); Thu, 23 Feb 2023 19:23:38 +0800 (CST) Received: from ex4.rt.l (192.168.10.47) by ex3.rt.l (192.168.10.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.20; Thu, 23 Feb 2023 19:23:38 +0800 Received: from linuxcarl2.richtek.com (192.168.10.154) by ex4.rt.l (192.168.10.45) with Microsoft SMTP Server id 15.2.1118.20 via Frontend Transport; Thu, 23 Feb 2023 19:23:38 +0800 From: ChiaEn Wu To: , , , , , , CC: , , , , , , , , Alice Chen , ChiaEn Wu Subject: [PATCH v17 RESEND 2/3] leds: flash: mt6370: Add MediaTek MT6370 flashlight support Date: Thu, 23 Feb 2023 19:23:08 +0800 Message-ID: X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230223_032422_018258_57FEBC92 X-CRM114-Status: GOOD ( 27.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: ChiYuan Huang The MediaTek MT6370 is a highly-integrated smart power management IC, which includes a single cell Li-Ion/Li-Polymer switching battery charger, a USB Type-C & Power Delivery (PD) controller, dual Flash LED current sources, a RGB LED driver, a backlight WLED driver, a display bias driver and a general LDO for portable devices. Add support for the MT6370 Flash LED driver. Flash LED in MT6370 has 2 channels and support torch/strobe mode. Acked-by: Jacek Anaszewski Co-developed-by: Alice Chen Signed-off-by: Alice Chen Signed-off-by: ChiYuan Huang Signed-off-by: ChiaEn Wu --- v17 - Update the year of Copyright from 2022 to 2023 --- drivers/leds/flash/Kconfig | 13 + drivers/leds/flash/Makefile | 1 + drivers/leds/flash/leds-mt6370-flash.c | 596 +++++++++++++++++++++++++++++++++ 3 files changed, 610 insertions(+) create mode 100644 drivers/leds/flash/leds-mt6370-flash.c diff --git a/drivers/leds/flash/Kconfig b/drivers/leds/flash/Kconfig index d3eb689..49d8922 100644 --- a/drivers/leds/flash/Kconfig +++ b/drivers/leds/flash/Kconfig @@ -61,6 +61,19 @@ config LEDS_MT6360 Independent current sources supply for each flash LED support torch and strobe mode. +config LEDS_MT6370_FLASH + tristate "Flash LED Support for MediaTek MT6370 PMIC" + depends on LEDS_CLASS + depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS + depends on MFD_MT6370 + help + Support 2 channels and torch/strobe mode. + Say Y here to enable support for + MT6370_FLASH_LED device. + + This driver can also be built as a module. If so, the module + will be called "leds-mt6370-flash". + 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 0acbddc..4665e8e 100644 --- a/drivers/leds/flash/Makefile +++ b/drivers/leds/flash/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_LEDS_MT6360) += leds-mt6360.o +obj-$(CONFIG_LEDS_MT6370_FLASH) += leds-mt6370-flash.o obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o obj-$(CONFIG_LEDS_AS3645A) += leds-as3645a.o obj-$(CONFIG_LEDS_KTD2692) += leds-ktd2692.o diff --git a/drivers/leds/flash/leds-mt6370-flash.c b/drivers/leds/flash/leds-mt6370-flash.c new file mode 100644 index 00000000..b03617f --- /dev/null +++ b/drivers/leds/flash/leds-mt6370-flash.c @@ -0,0 +1,596 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2023 Richtek Technology Corp. + * + * Authors: + * Alice Chen + * ChiYuan Huang + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +enum { + MT6370_LED_FLASH1 = 0, + MT6370_LED_FLASH2, + MT6370_MAX_LEDS +}; + +/* Virtual definition for multicolor */ + +#define MT6370_REG_FLEDEN 0x17E +#define MT6370_REG_STRBTO 0x173 +#define MT6370_REG_CHGSTAT2 0x1D1 +#define MT6370_REG_FLEDSTAT1 0x1D9 +#define MT6370_REG_FLEDISTRB(_id) (0x174 + 4 * (_id)) +#define MT6370_REG_FLEDITOR(_id) (0x175 + 4 * (_id)) +#define MT6370_ITORCH_MASK GENMASK(4, 0) +#define MT6370_ISTROBE_MASK GENMASK(6, 0) +#define MT6370_STRBTO_MASK GENMASK(6, 0) +#define MT6370_TORCHEN_MASK BIT(3) +#define MT6370_STROBEN_MASK BIT(2) +#define MT6370_FLCSEN_MASK(_id) BIT(MT6370_LED_FLASH2 - (_id)) +#define MT6370_FLCSEN_MASK_ALL GENMASK(1, 0) +#define MT6370_FLEDCHGVINOVP_MASK BIT(3) +#define MT6370_FLED1STRBTO_MASK BIT(11) +#define MT6370_FLED2STRBTO_MASK BIT(10) +#define MT6370_FLED1STRB_MASK BIT(9) +#define MT6370_FLED2STRB_MASK BIT(8) +#define MT6370_FLED1SHORT_MASK BIT(7) +#define MT6370_FLED2SHORT_MASK BIT(6) +#define MT6370_FLEDLVF_MASK BIT(3) + +#define MT6370_LED_JOINT 2 +#define MT6370_RANGE_FLED_REG 4 +#define MT6370_ITORCH_MIN_uA 25000 +#define MT6370_ITORCH_STEP_uA 12500 +#define MT6370_ITORCH_MAX_uA 400000 +#define MT6370_ITORCH_DOUBLE_MAX_uA 800000 +#define MT6370_ISTRB_MIN_uA 50000 +#define MT6370_ISTRB_STEP_uA 12500 +#define MT6370_ISTRB_MAX_uA 1500000 +#define MT6370_ISTRB_DOUBLE_MAX_uA 3000000 +#define MT6370_STRBTO_MIN_US 64000 +#define MT6370_STRBTO_STEP_US 32000 +#define MT6370_STRBTO_MAX_US 2432000 + +#define to_mt6370_led(ptr, member) container_of(ptr, struct mt6370_led, member) + +struct mt6370_led { + struct led_classdev_flash flash; + struct v4l2_flash *v4l2_flash; + struct mt6370_priv *priv; + u8 led_no; +}; + +struct mt6370_priv { + struct regmap *regmap; + struct mutex lock; + unsigned int fled_strobe_used; + unsigned int fled_torch_used; + unsigned int leds_active; + unsigned int leds_count; + struct mt6370_led leds[]; +}; + +static int mt6370_torch_brightness_set(struct led_classdev *lcdev, + enum led_brightness level) +{ + struct mt6370_led *led = to_mt6370_led(lcdev, flash.led_cdev); + struct mt6370_priv *priv = led->priv; + u32 led_enable_mask = led->led_no == MT6370_LED_JOINT ? + MT6370_FLCSEN_MASK_ALL : + MT6370_FLCSEN_MASK(led->led_no); + u32 enable_mask = MT6370_TORCHEN_MASK | led_enable_mask; + u32 val = level ? led_enable_mask : 0; + u32 curr; + int ret, i; + + mutex_lock(&priv->lock); + + /* + * There is only one set of flash control logic, and this + * flag is used to check if 'strobe' is currently being used. + */ + if (priv->fled_strobe_used) { + dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", + priv->fled_strobe_used); + ret = -EBUSY; + goto unlock; + } + + if (level) + curr = priv->fled_torch_used | BIT(led->led_no); + else + curr = priv->fled_torch_used & ~BIT(led->led_no); + + if (curr) + val |= MT6370_TORCHEN_MASK; + + if (level) { + level -= 1; + if (led->led_no == MT6370_LED_JOINT) { + u32 flevel[MT6370_MAX_LEDS]; + + flevel[0] = level / 2; + flevel[1] = level - flevel[0]; + for (i = 0; i < MT6370_MAX_LEDS; i++) { + ret = regmap_update_bits(priv->regmap, + MT6370_REG_FLEDITOR(i), + MT6370_ITORCH_MASK, flevel[i]); + if (ret) + goto unlock; + } + } else { + ret = regmap_update_bits(priv->regmap, + MT6370_REG_FLEDITOR(led->led_no), + MT6370_ITORCH_MASK, level); + if (ret) + goto unlock; + } + } + + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDEN, + enable_mask, val); + if (ret) + goto unlock; + + priv->fled_torch_used = curr; + +unlock: + mutex_unlock(&priv->lock); + return ret; +} + +static int mt6370_flash_brightness_set(struct led_classdev_flash *fl_cdev, + u32 brightness) +{ + /* + * Because of the current spikes when turning on the flash, + * the brightness should be kept by the LED framework. This + * empty function is used to prevent checking failure when + * led_classdev_flash registers ops. + */ + return 0; +} + +static int _mt6370_flash_brightness_set(struct led_classdev_flash *fl_cdev, + u32 brightness) +{ + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash); + struct mt6370_priv *priv = led->priv; + struct led_flash_setting *setting = &fl_cdev->brightness; + u32 val = (brightness - setting->min) / setting->step; + int ret, i; + + if (led->led_no == MT6370_LED_JOINT) { + u32 flevel[MT6370_MAX_LEDS]; + + flevel[0] = val / 2; + flevel[1] = val - flevel[0]; + for (i = 0; i < MT6370_MAX_LEDS; i++) { + ret = regmap_update_bits(priv->regmap, + MT6370_REG_FLEDISTRB(i), + MT6370_ISTROBE_MASK, flevel[i]); + if (ret) + break; + } + } else + ret = regmap_update_bits(priv->regmap, + MT6370_REG_FLEDISTRB(led->led_no), + MT6370_ISTROBE_MASK, val); + + return ret; +} + +static int mt6370_strobe_set(struct led_classdev_flash *fl_cdev, bool state) +{ + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash); + struct mt6370_priv *priv = led->priv; + struct led_classdev *lcdev = &fl_cdev->led_cdev; + struct led_flash_setting *s = &fl_cdev->brightness; + u32 led_enable_mask = led->led_no == MT6370_LED_JOINT ? + MT6370_FLCSEN_MASK_ALL : + MT6370_FLCSEN_MASK(led->led_no); + u32 enable_mask = MT6370_STROBEN_MASK | led_enable_mask; + u32 val = state ? led_enable_mask : 0; + u32 curr; + int ret; + + mutex_lock(&priv->lock); + + /* + * There is only one set of flash control logic, and this + * flag is used to check if 'torch' is currently being used. + */ + if (priv->fled_torch_used) { + dev_warn(lcdev->dev, "Please disable torch first [0x%x]\n", + priv->fled_torch_used); + ret = -EBUSY; + goto unlock; + } + + if (state) + curr = priv->fled_strobe_used | BIT(led->led_no); + else + curr = priv->fled_strobe_used & ~BIT(led->led_no); + + if (curr) + val |= MT6370_STROBEN_MASK; + + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDEN, enable_mask, + val); + if (ret) { + dev_err(lcdev->dev, "[%d] control current source %d fail\n", + led->led_no, state); + goto unlock; + } + + /* + * If the flash needs to turn on, configure the flash current to + * ramp up to the setting value. Otherwise, always revert to the + * minimum one. + */ + ret = _mt6370_flash_brightness_set(fl_cdev, state ? s->val : s->min); + if (ret) { + dev_err(lcdev->dev, "[%d] Failed to set brightness\n", led->led_no); + goto unlock; + } + + /* + * For the flash to turn on/off, we must wait for HW ramping + * up/down time 5ms/500us to prevent the unexpected problem. + */ + if (!priv->fled_strobe_used && curr) + usleep_range(5000, 6000); + else if (priv->fled_strobe_used && !curr) + usleep_range(500, 600); + + priv->fled_strobe_used = curr; + +unlock: + mutex_unlock(&priv->lock); + return ret; +} + +static int mt6370_strobe_get(struct led_classdev_flash *fl_cdev, bool *state) +{ + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash); + struct mt6370_priv *priv = led->priv; + + mutex_lock(&priv->lock); + *state = !!(priv->fled_strobe_used & BIT(led->led_no)); + mutex_unlock(&priv->lock); + + return 0; +} + +static int mt6370_timeout_set(struct led_classdev_flash *fl_cdev, u32 timeout) +{ + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash); + struct mt6370_priv *priv = led->priv; + struct led_flash_setting *s = &fl_cdev->timeout; + u32 val = (timeout - s->min) / s->step; + + return regmap_update_bits(priv->regmap, MT6370_REG_STRBTO, + MT6370_STRBTO_MASK, val); +} + +static int mt6370_fault_get(struct led_classdev_flash *fl_cdev, u32 *fault) +{ + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash); + struct mt6370_priv *priv = led->priv; + u16 fled_stat; + unsigned int chg_stat, strobe_timeout_mask, fled_short_mask; + u32 rfault = 0; + int ret; + + ret = regmap_read(priv->regmap, MT6370_REG_CHGSTAT2, &chg_stat); + if (ret) + return ret; + + ret = regmap_raw_read(priv->regmap, MT6370_REG_FLEDSTAT1, &fled_stat, + sizeof(fled_stat)); + if (ret) + return ret; + + switch (led->led_no) { + case MT6370_LED_FLASH1: + strobe_timeout_mask = MT6370_FLED1STRBTO_MASK; + fled_short_mask = MT6370_FLED1SHORT_MASK; + break; + + case MT6370_LED_FLASH2: + strobe_timeout_mask = MT6370_FLED2STRBTO_MASK; + fled_short_mask = MT6370_FLED2SHORT_MASK; + break; + + case MT6370_LED_JOINT: + strobe_timeout_mask = MT6370_FLED1STRBTO_MASK | + MT6370_FLED2STRBTO_MASK; + fled_short_mask = MT6370_FLED1SHORT_MASK | + MT6370_FLED2SHORT_MASK; + break; + default: + return -EINVAL; + } + + if (chg_stat & MT6370_FLEDCHGVINOVP_MASK) + rfault |= LED_FAULT_INPUT_VOLTAGE; + + if (fled_stat & strobe_timeout_mask) + rfault |= LED_FAULT_TIMEOUT; + + if (fled_stat & fled_short_mask) + rfault |= LED_FAULT_SHORT_CIRCUIT; + + if (fled_stat & MT6370_FLEDLVF_MASK) + rfault |= LED_FAULT_UNDER_VOLTAGE; + + *fault = rfault; + return ret; +} + +static const struct led_flash_ops mt6370_flash_ops = { + .flash_brightness_set = mt6370_flash_brightness_set, + .strobe_set = mt6370_strobe_set, + .strobe_get = mt6370_strobe_get, + .timeout_set = mt6370_timeout_set, + .fault_get = mt6370_fault_get, +}; + +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) +static int mt6370_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, + bool enable) +{ + struct led_classdev_flash *flash = v4l2_flash->fled_cdev; + struct mt6370_led *led = to_mt6370_led(flash, flash); + struct mt6370_priv *priv = led->priv; + u32 mask = led->led_no == MT6370_LED_JOINT ? MT6370_FLCSEN_MASK_ALL : + MT6370_FLCSEN_MASK(led->led_no); + u32 val = enable ? mask : 0; + int ret; + + mutex_lock(&priv->lock); + + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDEN, mask, val); + if (ret) + goto unlock; + + if (enable) + priv->fled_strobe_used |= BIT(led->led_no); + else + priv->fled_strobe_used &= ~BIT(led->led_no); + +unlock: + mutex_unlock(&priv->lock); + return ret; +} + +static const struct v4l2_flash_ops v4l2_flash_ops = { + .external_strobe_set = mt6370_flash_external_strobe_set, +}; + +static void mt6370_init_v4l2_flash_config(struct mt6370_led *led, + struct v4l2_flash_config *cfg) +{ + struct led_classdev *lcdev; + struct led_flash_setting *s = &cfg->intensity; + + lcdev = &led->flash.led_cdev; + + s->min = MT6370_ITORCH_MIN_uA; + s->step = MT6370_ITORCH_STEP_uA; + s->val = s->max = s->min + (lcdev->max_brightness - 1) * s->step; + + cfg->has_external_strobe = 1; + strscpy(cfg->dev_name, dev_name(lcdev->dev), sizeof(cfg->dev_name)); + + cfg->flash_faults = LED_FAULT_SHORT_CIRCUIT | LED_FAULT_TIMEOUT | + LED_FAULT_INPUT_VOLTAGE | LED_FAULT_UNDER_VOLTAGE; +} +#else +static const struct v4l2_flash_ops v4l2_flash_ops; +static void mt6370_init_v4l2_flash_config(struct mt6370_led *led, + struct v4l2_flash_config *cfg) +{ +} +#endif + +static void mt6370_v4l2_flash_release(void *v4l2_flash) +{ + v4l2_flash_release(v4l2_flash); +} + +static int mt6370_led_register(struct device *parent, struct mt6370_led *led, + struct fwnode_handle *fwnode) +{ + struct led_init_data init_data = { .fwnode = fwnode }; + struct v4l2_flash_config v4l2_config = {}; + int ret; + + ret = devm_led_classdev_flash_register_ext(parent, &led->flash, + &init_data); + if (ret) + return dev_err_probe(parent, ret, + "Couldn't register flash %d\n", led->led_no); + + mt6370_init_v4l2_flash_config(led, &v4l2_config); + led->v4l2_flash = v4l2_flash_init(parent, fwnode, &led->flash, + &v4l2_flash_ops, &v4l2_config); + if (IS_ERR(led->v4l2_flash)) + return dev_err_probe(parent, PTR_ERR(led->v4l2_flash), + "Failed to register %d v4l2 sd\n", led->led_no); + + return devm_add_action_or_reset(parent, mt6370_v4l2_flash_release, + led->v4l2_flash); +} + +static u32 mt6370_clamp(u32 val, u32 min, u32 max, u32 step) +{ + u32 retval; + + retval = clamp_val(val, min, max); + if (step > 1) + retval = rounddown(retval - min, step) + min; + + return retval; +} + +static int mt6370_init_flash_properties(struct device *dev, + struct mt6370_led *led, + struct fwnode_handle *fwnode) +{ + struct led_classdev_flash *flash = &led->flash; + struct led_classdev *lcdev = &flash->led_cdev; + struct mt6370_priv *priv = led->priv; + struct led_flash_setting *s; + u32 sources[MT6370_MAX_LEDS]; + u32 max_ua, val; + int i, ret, num; + + num = fwnode_property_count_u32(fwnode, "led-sources"); + if (num < 1) + return dev_err_probe(dev, -EINVAL, + "Not specified or wrong number of led-sources\n"); + + ret = fwnode_property_read_u32_array(fwnode, "led-sources", sources, num); + if (ret) + return ret; + + for (i = 0; i < num; i++) { + if (sources[i] >= MT6370_MAX_LEDS) + return -EINVAL; + if (priv->leds_active & BIT(sources[i])) + return -EINVAL; + priv->leds_active |= BIT(sources[i]); + } + + led->led_no = num == 2 ? MT6370_LED_JOINT : sources[0]; + + max_ua = num == 2 ? MT6370_ITORCH_DOUBLE_MAX_uA : MT6370_ITORCH_MAX_uA; + val = MT6370_ITORCH_MIN_uA; + ret = fwnode_property_read_u32(fwnode, "led-max-microamp", &val); + if (!ret) + val = mt6370_clamp(val, MT6370_ITORCH_MIN_uA, max_ua, + MT6370_ITORCH_STEP_uA); + + lcdev->max_brightness = (val - MT6370_ITORCH_MIN_uA) / + MT6370_ITORCH_STEP_uA + 1; + lcdev->brightness_set_blocking = mt6370_torch_brightness_set; + lcdev->flags |= LED_DEV_CAP_FLASH; + + max_ua = num == 2 ? MT6370_ISTRB_DOUBLE_MAX_uA : MT6370_ISTRB_MAX_uA; + val = MT6370_ISTRB_MIN_uA; + ret = fwnode_property_read_u32(fwnode, "flash-max-microamp", &val); + if (!ret) + val = mt6370_clamp(val, MT6370_ISTRB_MIN_uA, max_ua, + MT6370_ISTRB_STEP_uA); + + s = &flash->brightness; + s->min = MT6370_ISTRB_MIN_uA; + s->step = MT6370_ISTRB_STEP_uA; + s->val = s->max = val; + + /* + * Always configure to the minimum level when + * off to prevent flash current spikes. + */ + ret = _mt6370_flash_brightness_set(flash, s->min); + if (ret) + return ret; + + + val = MT6370_STRBTO_MIN_US; + ret = fwnode_property_read_u32(fwnode, "flash-max-timeout-us", &val); + if (!ret) + val = mt6370_clamp(val, MT6370_STRBTO_MIN_US, + MT6370_STRBTO_MAX_US, MT6370_STRBTO_STEP_US); + + s = &flash->timeout; + s->min = MT6370_STRBTO_MIN_US; + s->step = MT6370_STRBTO_STEP_US; + s->val = s->max = val; + + flash->ops = &mt6370_flash_ops; + + return 0; +} + +static int mt6370_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mt6370_priv *priv; + struct fwnode_handle *child; + size_t count; + int i = 0, ret; + + count = device_get_child_node_count(dev); + if (!count || count > MT6370_MAX_LEDS) + return dev_err_probe(dev, -EINVAL, + "No child node or node count over max led number %zu\n", count); + + priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->leds_count = count; + mutex_init(&priv->lock); + + priv->regmap = dev_get_regmap(dev->parent, NULL); + if (!priv->regmap) + return dev_err_probe(dev, -ENODEV, "Failed to get parent regmap\n"); + + device_for_each_child_node(dev, child) { + struct mt6370_led *led = priv->leds + i; + + led->priv = priv; + + ret = mt6370_init_flash_properties(dev, led, child); + if (ret) { + fwnode_handle_put(child); + return ret; + } + + ret = mt6370_led_register(dev, led, child); + if (ret) { + fwnode_handle_put(child); + return ret; + } + + i++; + } + + return 0; +} + +static const struct of_device_id mt6370_led_of_id[] = { + { .compatible = "mediatek,mt6370-flashlight" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mt6370_led_of_id); + +static struct platform_driver mt6370_led_driver = { + .driver = { + .name = "mt6370-flashlight", + .of_match_table = mt6370_led_of_id, + }, + .probe = mt6370_led_probe, +}; +module_platform_driver(mt6370_led_driver); + +MODULE_AUTHOR("Alice Chen "); +MODULE_AUTHOR("ChiYuan Huang "); +MODULE_DESCRIPTION("MT6370 FLASH LED Driver"); +MODULE_LICENSE("GPL");