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Date: Thu, 20 Jun 2024 10:31:14 +0100
From: Lee Jones <lee@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Thomas Weißschuh <thomas@...ssschuh.net>,
Pavel Machek <pavel@....cz>, Benson Leung <bleung@...omium.org>,
Guenter Roeck <groeck@...omium.org>, linux-leds@...r.kernel.org,
chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds: cros_ec: Implement review comments from Lee
Definitely not seen a commit message like that before
> Implement review comments from Lee as requested in [0] for
> "leds: Add ChromeOS EC driver".
>
> Changes:
> * Inline DRV_NAME string constant.
> * Use dev_err() instead of dev_warn() to report errors.
> * Rename cros_ec_led_probe_led() to cros_ec_led_probe_one().
> * Make loop variable "int" where they belong.
> * Move "Unknown LED" comment to where it belongs.
> * Register trigger during _probe().
> * Use module_platform_driver() and drop all the custom boilerplate.
If you're fixing many things, then I would expect to receive many
patches. One patch for functional change please. If you can reasonably
group fixes of similar elk, then please do. However one patch that does
a bunch of different things is a no-go from me, sorry.
> [0] https://lore.kernel.org/lkml/20240614093445.GF3029315@google.com/T/#m8750abdef6a968ace765645189170814196c9ce9
>
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> drivers/leds/leds-cros_ec.c | 50 +++++++++++++--------------------------------
> 1 file changed, 14 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/leds/leds-cros_ec.c b/drivers/leds/leds-cros_ec.c
> index 7bb21a587713..275522b81ea5 100644
> --- a/drivers/leds/leds-cros_ec.c
> +++ b/drivers/leds/leds-cros_ec.c
> @@ -14,8 +14,6 @@
> #include <linux/platform_data/cros_ec_commands.h>
> #include <linux/platform_data/cros_ec_proto.h>
>
> -#define DRV_NAME "cros-ec-led"
> -
> static const char * const cros_ec_led_functions[] = {
> [EC_LED_ID_BATTERY_LED] = LED_FUNCTION_CHARGING,
> [EC_LED_ID_POWER_LED] = LED_FUNCTION_POWER,
> @@ -152,7 +150,7 @@ static int cros_ec_led_count_subleds(struct device *dev,
>
> if (common_range != range) {
> /* The multicolor LED API expects a uniform max_brightness */
> - dev_warn(dev, "Inconsistent LED brightness values\n");
> + dev_err(dev, "Inconsistent LED brightness values\n");
> return -EINVAL;
> }
> }
> @@ -176,22 +174,21 @@ static const char *cros_ec_led_get_color_name(struct led_classdev_mc *led_mc_cde
> return led_get_color_name(color);
> }
>
> -static int cros_ec_led_probe_led(struct device *dev, struct cros_ec_device *cros_ec,
> +static int cros_ec_led_probe_one(struct device *dev, struct cros_ec_device *cros_ec,
> enum ec_led_id id)
> {
> union cros_ec_led_cmd_data arg = {};
> struct cros_ec_led_priv *priv;
> struct led_classdev *led_cdev;
> struct mc_subled *subleds;
> - int ret, num_subleds;
> - size_t i, subled;
> + int i, ret, num_subleds;
> + size_t subled;
>
> arg.req.led_id = id;
> arg.req.flags = EC_LED_FLAGS_QUERY;
> ret = cros_ec_led_send_cmd(cros_ec, &arg);
> - /* Unknown LED, skip */
> if (ret == -EINVAL)
> - return 0;
> + return 0; /* Unknown LED, skip */
> if (ret == -EOPNOTSUPP)
> return -ENODEV;
> if (ret < 0)
> @@ -247,11 +244,14 @@ static int cros_ec_led_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
> struct cros_ec_device *cros_ec = ec_dev->ec_dev;
> - int ret = 0;
> - size_t i;
> + int i, ret = 0;
> +
> + ret = devm_led_trigger_register(dev, &cros_ec_led_trigger);
> + if (ret)
> + return ret;
>
> for (i = 0; i < EC_LED_ID_COUNT; i++) {
> - ret = cros_ec_led_probe_led(dev, cros_ec, i);
> + ret = cros_ec_led_probe_one(dev, cros_ec, i);
> if (ret)
> break;
> }
> @@ -260,38 +260,16 @@ static int cros_ec_led_probe(struct platform_device *pdev)
> }
>
> static const struct platform_device_id cros_ec_led_id[] = {
> - { DRV_NAME, 0 },
> + { "cros-ec-led", 0 },
> {}
> };
>
> static struct platform_driver cros_ec_led_driver = {
> - .driver.name = DRV_NAME,
> + .driver.name = "cros-ec-led",
> .probe = cros_ec_led_probe,
> .id_table = cros_ec_led_id,
> };
> -
> -static int __init cros_ec_led_init(void)
> -{
> - int ret;
> -
> - ret = led_trigger_register(&cros_ec_led_trigger);
> - if (ret)
> - return ret;
> -
> - ret = platform_driver_register(&cros_ec_led_driver);
> - if (ret)
> - led_trigger_unregister(&cros_ec_led_trigger);
> -
> - return ret;
> -};
> -module_init(cros_ec_led_init);
> -
> -static void __exit cros_ec_led_exit(void)
> -{
> - platform_driver_unregister(&cros_ec_led_driver);
> - led_trigger_unregister(&cros_ec_led_trigger);
> -};
> -module_exit(cros_ec_led_exit);
> +module_platform_driver(cros_ec_led_driver);
>
> MODULE_DEVICE_TABLE(platform, cros_ec_led_id);
> MODULE_DESCRIPTION("ChromeOS EC LED Driver");
>
> ---
> base-commit: b6774dd948171c478c7aa19318b1d7ae9cf6d7a4
> change-id: 20240614-cros_ec-led-review-ec93abc65933
>
> Best regards,
> --
> Thomas Weißschuh <linux@...ssschuh.net>
>
--
Lee Jones [李琼斯]
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