Re: [PATCH 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver

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On Sat, Sep 5, 2020 at 4:10 PM Luka Kovacic <luka.kovacic@xxxxxxxxxx> wrote:
>
> Add support for the iEi WT61P803 PUZZLE LED driver.
> Currently only the front panel power LED is supported.
>
> This driver depends on the iEi WT61P803 PUZZLE MFD driver.

Can we make it OF independent?
See below how to achieve this.

> Signed-off-by: Luka Kovacic <luka.kovacic@xxxxxxxxxx>
> Cc: Luka Perkov <luka.perkov@xxxxxxxxxx>
> ---
>  drivers/leds/Kconfig                    |   8 ++
>  drivers/leds/Makefile                   |   1 +
>  drivers/leds/leds-iei-wt61p803-puzzle.c | 184 ++++++++++++++++++++++++
>  3 files changed, 193 insertions(+)
>  create mode 100644 drivers/leds/leds-iei-wt61p803-puzzle.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 1c181df24eae..8a25fb753dec 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -332,6 +332,14 @@ config LEDS_IPAQ_MICRO
>           Choose this option if you want to use the notification LED on
>           Compaq/HP iPAQ h3100 and h3600.
>
> +config LEDS_IEI_WT61P803_PUZZLE
> +       tristate "LED Support for the iEi WT61P803 PUZZLE MCU"
> +       depends on LEDS_CLASS
> +       depends on MFD_IEI_WT61P803_PUZZLE
> +       help
> +         This option enables support for LEDs controlled by the iEi WT61P803
> +         M801 MCU.
> +
>  config LEDS_HP6XX
>         tristate "LED Support for the HP Jornada 6xx"
>         depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index c2c7d7ade0d0..cd362437fefd 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -34,6 +34,7 @@ obj-$(CONFIG_LEDS_HP6XX)              += leds-hp6xx.o
>  obj-$(CONFIG_LEDS_INTEL_SS4200)                += leds-ss4200.o
>  obj-$(CONFIG_LEDS_IP30)                        += leds-ip30.o
>  obj-$(CONFIG_LEDS_IPAQ_MICRO)          += leds-ipaq-micro.o
> +obj-$(CONFIG_LEDS_IEI_WT61P803_PUZZLE) += leds-iei-wt61p803-puzzle.o
>  obj-$(CONFIG_LEDS_IS31FL319X)          += leds-is31fl319x.o
>  obj-$(CONFIG_LEDS_IS31FL32XX)          += leds-is31fl32xx.o
>  obj-$(CONFIG_LEDS_KTD2692)             += leds-ktd2692.o
> diff --git a/drivers/leds/leds-iei-wt61p803-puzzle.c b/drivers/leds/leds-iei-wt61p803-puzzle.c
> new file mode 100644
> index 000000000000..50d1e4e81571
> --- /dev/null
> +++ b/drivers/leds/leds-iei-wt61p803-puzzle.c
> @@ -0,0 +1,184 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +/* iEi WT61P803 PUZZLE MCU LED Driver
> + *
> + * Copyright (C) 2020 Sartura Ltd.
> + * Author: Luka Kovacic <luka.kovacic@xxxxxxxxxx>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/mfd/iei-wt61p803-puzzle.h>

> +#include <linux/of.h>
> +#include <linux/of_device.h>

of*.h -> mod_devicetable.h

> +#include <linux/platform_device.h>

+ property.h

> +#include <linux/slab.h>
> +
> +#include <linux/leds.h>
> +
> +#define CMD_CHAR(x) (char)(x)
> +
> +/**
> + * enum iei_wt61p803_puzzle_led_state - LED state values

> + *

This is not needed.

> + * @IEI_LED_OFF: The LED is turned off
> + * @IEI_LED_ON: The LED is turned on
> + * @IEI_LED_BLINK_5HZ: The LED will blink with a freq of 5 Hz
> + * @IEI_LED_BLINK_1HZ: The LED will blink with a freq of 1 Hz
> + */
> +enum iei_wt61p803_puzzle_led_state {
> +       IEI_LED_OFF = 0x30,
> +       IEI_LED_ON = 0x31,
> +       IEI_LED_BLINK_5HZ = 0x32,
> +       IEI_LED_BLINK_1HZ = 0x33

Can we leave a comma here?

> +};
> +
> +/**
> + * struct iei_wt61p803_puzzle_led - MCU LED Driver

> + *

This is not needed.

> + * @mcu: MCU struct pointer
> + * @lock: General mutex lock for LED operations
> + * @led_power_state: State of the front panel power LED
> + */
> +struct iei_wt61p803_puzzle_led {
> +       struct iei_wt61p803_puzzle *mcu;
> +       struct mutex lock;
> +
> +       int led_power_state;
> +};
> +
> +static inline struct iei_wt61p803_puzzle_led *
> +               cdev_to_iei_wt61p803_puzzle_led(struct led_classdev *led_cdev)

It's a rather strange indentation.

> +{
> +       return dev_get_drvdata(led_cdev->dev->parent);
> +}
> +
> +static int iei_wt61p803_puzzle_led_brightness_set_blocking
> +       (struct led_classdev *cdev, enum led_brightness brightness)

Ditto.

> +{
> +       struct iei_wt61p803_puzzle_led *mcu_led =
> +               cdev_to_iei_wt61p803_puzzle_led(cdev);

> +       unsigned char led_power_cmd[5] = { '@', 'R', '1',
> +               CMD_CHAR(IEI_LED_OFF) };

Ditto.

> +

This is not needed.

> +       int ret;

> +

Ditto.

> +       size_t reply_size = 0;

> +       unsigned char *resp_buf = kmalloc(IEI_WT61P803_PUZZLE_BUF_SIZE, GFP_KERNEL);

Please move the assignment closer to its use and add an error check.
Btw, how big is the buffer?

> +       mutex_lock(&mcu_led->lock);
> +
> +       if (brightness == LED_OFF) {
> +               led_power_cmd[3] = CMD_CHAR(IEI_LED_OFF);
> +               mcu_led->led_power_state = LED_OFF;
> +       } else {
> +               led_power_cmd[3] = CMD_CHAR(IEI_LED_ON);
> +               mcu_led->led_power_state = LED_ON;
> +       }
> +
> +       mutex_unlock(&mcu_led->lock);
> +
> +       ret = iei_wt61p803_puzzle_write_command(mcu_led->mcu, led_power_cmd,
> +                       sizeof(led_power_cmd), resp_buf, &reply_size);
> +
> +       kfree(resp_buf);
> +
> +       return ret;
> +}
> +
> +static enum led_brightness
> +iei_wt61p803_puzzle_led_brightness_get(struct led_classdev *cdev)
> +{
> +       struct iei_wt61p803_puzzle_led *mcu_led =
> +               cdev_to_iei_wt61p803_puzzle_led(cdev);

> +

This is not needed.

> +       int led_state;
> +
> +       mutex_lock(&mcu_led->lock);
> +       led_state = mcu_led->led_power_state;
> +       mutex_unlock(&mcu_led->lock);
> +
> +       return led_state;
> +}
> +
> +static int iei_wt61p803_puzzle_led_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev->parent);

> +       struct device_node *np = dev->of_node;

Drop this.

> +

This is not needed.

> +       struct iei_wt61p803_puzzle_led *mcu_led;

> +       struct device_node *child;

struct fwnode_handle *child;

> +

This is not needed

> +       int ret;
> +
> +       mcu_led = devm_kzalloc(dev, sizeof(*mcu_led), GFP_KERNEL);
> +       if (!mcu_led)
> +               return -ENOMEM;
> +
> +       mcu_led->mcu = mcu;
> +
> +       /* The default LED power state is 1 */
> +       mcu_led->led_power_state = 1;
> +
> +       /* Init the mutex lock */
> +       mutex_init(&mcu_led->lock);
> +
> +       dev_set_drvdata(dev, mcu_led);
> +

> +       for_each_child_of_node(np, child) {

device_for_each_child_node()

> +               struct led_classdev *led;
> +               u32 reg;
> +
> +               led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
> +               if (!led)
> +                       return -ENOMEM;
> +

> +               ret = of_property_read_u32(child, "reg", &reg);

fwnode_property_read_u32()

> +               if (ret || reg > 1) {

> +                       dev_err(dev, "Could not register 'reg' of %s\n",
> +                               child->name);

%pfw

> +                       continue;
> +               }
> +

> +               if (of_property_read_string(child, "label", &led->name))

of_ -> fwnode_

> +                       led->name = child->name;

devm_kasprintf()

See, for example, drivers/leds/leds-max77650.c for such approach.

> +
> +               of_property_read_string(child, "linux,default-trigger",
> +                               &led->default_trigger);

of_ -> fwnode_

> +
> +               led->brightness_set_blocking =
> +                       iei_wt61p803_puzzle_led_brightness_set_blocking;
> +               led->brightness_get = iei_wt61p803_puzzle_led_brightness_get;
> +
> +               led->max_brightness = 1;
> +
> +               ret = devm_led_classdev_register(dev, led);
> +               if (ret) {
> +                       dev_err(dev, "Could not register %s\n", led->name);
> +                       return ret;
> +               }
> +       }
> +
> +       return 0;

> +

This is not needed.

> +}
> +
> +static const struct of_device_id iei_wt61p803_puzzle_led_of_match[] = {
> +       { .compatible = "iei,wt61p803-puzzle-leds" },
> +       { }
> +};
> +MODULE_DEVICE_TABLE(of, iei_wt61p803_puzzle_led_of_match);
> +
> +static struct platform_driver iei_wt61p803_puzzle_led_driver = {
> +       .driver = {
> +               .name = "iei-wt61p803-puzzle-led",
> +               .of_match_table = iei_wt61p803_puzzle_led_of_match,
> +       },
> +       .probe = iei_wt61p803_puzzle_led_probe,
> +};
> +module_platform_driver(iei_wt61p803_puzzle_led_driver);
> +
> +MODULE_DESCRIPTION("iEi WT61P803 PUZZLE front panel LED driver");
> +MODULE_AUTHOR("Luka Kovacic <luka.kovacic@xxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:leds-iei-wt61p803-puzzle");
> --
> 2.20.1
>


-- 
With Best Regards,
Andy Shevchenko



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