[PATCH v6 12/13] leds: flash: mt6370: Add MediaTek MT6370 flashlight support
AngeloGioacchino Del Regno
angelogioacchino.delregno at collabora.com
Fri Jul 22 03:48:45 PDT 2022
Il 22/07/22 12:24, ChiaEn Wu ha scritto:
> From: Alice Chen <alice_chen at richtek.com>
>
> 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.
>
> The Flash LED in MT6370 has 2 channels and support torch/strobe mode.
> Add the support of MT6370 FLASH LED.
>
> Signed-off-by: Alice Chen <alice_chen at richtek.com>
> ---
>
> v6
> - Use 'GENMASK' instead of 'BIT'.
> - Use dev_err_probe to decrease LOC.
> - Use 'dev' variable to make probe function more clean.
> - Refine the return of _mt6370_flash_brightness_set function.
> - Refine the descriptions.
> - Use mt6370_clamp() instead of clamp_align().
> - Use device resource managed API for v4l2 flash_release.
> ---
> drivers/leds/flash/Kconfig | 12 +
> drivers/leds/flash/Makefile | 1 +
> drivers/leds/flash/leds-mt6370-flash.c | 633 +++++++++++++++++++++++++++++++++
> 3 files changed, 646 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..d5761ed 100644
> --- a/drivers/leds/flash/Kconfig
> +++ b/drivers/leds/flash/Kconfig
> @@ -90,4 +90,16 @@ config LEDS_SGM3140
> This option enables support for the SGM3140 500mA Buck/Boost Charge
> Pump LED Driver.
>
> +config LEDS_MT6370_FLASHLIGHT
> + tristate "Flash LED Support for MediaTek MT6370 PMIC"
> + depends on LEDS_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".
> +
> endif # LEDS_CLASS_FLASH
> diff --git a/drivers/leds/flash/Makefile b/drivers/leds/flash/Makefile
> index 0acbddc..4c4c171 100644
> --- a/drivers/leds/flash/Makefile
> +++ b/drivers/leds/flash/Makefile
> @@ -9,3 +9,4 @@ obj-$(CONFIG_LEDS_MAX77693) += leds-max77693.o
> obj-$(CONFIG_LEDS_RT4505) += leds-rt4505.o
> obj-$(CONFIG_LEDS_RT8515) += leds-rt8515.o
> obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o
> +obj-$(CONFIG_LEDS_MT6370_FLASHLIGHT) += leds-mt6370-flash.o
> diff --git a/drivers/leds/flash/leds-mt6370-flash.c b/drivers/leds/flash/leds-mt6370-flash.c
> new file mode 100644
> index 0000000..fe439ee
> --- /dev/null
> +++ b/drivers/leds/flash/leds-mt6370-flash.c
> @@ -0,0 +1,633 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2022 Richtek Technology Corp.
> + *
> + * Author: Alice Chen <alice_chen at richtek.com
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/led-class-flash.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/property.h>
> +#include <linux/regmap.h>
> +
> +#include <media/v4l2-flash-led-class.h>
> +
> +enum {
> + MT6370_LED_FLASH1,
> + 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)
Please fix the indentation.
> +#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)
..snip..
> +
> +static int mt6370_init_flash_properties(struct mt6370_led *led,
> + struct led_init_data *init_data)
> +{
> + 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(init_data->fwnode, "led-sources");
> + if (num < 1 || num > MT6370_MAX_LEDS)
> + return dev_err_probe(priv->dev, -EINVAL,
> + "Not specified or wrong number of led-sources\n");
> +
> + ret = fwnode_property_read_u32_array(init_data->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 == MT6370_MAX_LEDS) ? MT6370_LED_JOINT :
> + sources[0];
> +
> + max_uA = (num == 2) ? MT6370_ITORCH_DOUBLE_MAX_UA : MT6370_ITORCH_MAX_UA;
> + ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
> + if (ret) {
> + dev_warn(priv->dev,
> + "Not specified led-max-microamp, config to the minimum\n");
This should be a dev_info() instead.
> + val = MT6370_ITORCH_MIN_UA;
> + } else {
> + 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;
> + ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-microamp", &val);
> + if (ret) {
> + dev_warn(priv->dev,
> + "Not specified flash-max-microamp, config to the minimum\n");
same here
> + val = MT6370_ISTRB_MIN_UA;
> + } else {
> + 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 as min level when off to
> + * prevent flash current spike
> + */
> + ret = _mt6370_flash_brightness_set(flash, s->min);
> + if (ret)
> + return ret;
> +
> + ret = fwnode_property_read_u32(init_data->fwnode,
> + "flash-max-timeout-us", &val);
> + if (ret) {
> + dev_warn(priv->dev,
> + "Not specified flash-max-timeout-us, config to the minimum\n");
and same here
> + val = MT6370_STRBTO_MIN_US;
> + } else {
> + 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_init_common_properties(struct mt6370_led *led,
> + struct led_init_data *init_data)
> +{
> + const char * const states[] = { "off", "keep", "on" };
> + const char *str = states[STATE_OFF];
> + int ret;
> +
> + fwnode_property_read_string(init_data->fwnode, "default-state", &str);
> + ret = match_string(states, ARRAY_SIZE(states), str);
> + if (ret >= 0)
> + led->default_state = ret;
> +
> + 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;
> + priv->dev = dev;
> + 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;
> + struct led_init_data init_data = { .fwnode = child, };
> +
> + led->priv = priv;
> + ret = mt6370_init_common_properties(led, &init_data);
> + if (ret)
> + return ret;
> +
> + ret = mt6370_init_flash_properties(led, &init_data);
> +
Unnecessary blank line here.
> + if (ret)
> + return ret;
> +
> + ret = mt6370_led_register(dev, led, &init_data);
> + if (ret)
> + return ret;
> +
> + i++;
> + }
> +
> + return 0;
> +}
> +
> +static const struct of_device_id mt6370_led_of_id[] = {
> + { .compatible = "mediatek,mt6370-flashlight" },
As common practice, write that the last element is a sentinel.
{ /* sentinel */ },
Everything else looks good.
Regards,
Angelo
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