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Message-ID: <CAHp75VdnOJKwvZUOsj3bbT8tK9uZN=NufDrdhUvS886bNUpWhA@mail.gmail.com>
Date: Tue, 20 Oct 2020 12:00:47 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Luka Kovacic <luka.kovacic@...tura.hr>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-hwmon@...r.kernel.org,
Linux LED Subsystem <linux-leds@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
Lee Jones <lee.jones@...aro.org>, Pavel Machek <pavel@....cz>,
Dan Murphy <dmurphy@...com>, Rob Herring <robh+dt@...nel.org>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Marek Behún <marek.behun@....cz>,
luka.perkov@...tura.hr, robert.marko@...tura.hr
Subject: Re: [PATCH v6 3/6] drivers: hwmon: Add the iEi WT61P803 PUZZLE HWMON driver
On Tue, Oct 20, 2020 at 1:19 AM Luka Kovacic <luka.kovacic@...tura.hr> wrote:
>
> Add the iEi WT61P803 PUZZLE HWMON driver, that handles the fan speed
> control via PWM, reading fan speed and reading on-board temperature
> sensors.
>
> The driver registers a HWMON device and a simple thermal cooling device to
> enable in-kernel fan management.
>
> This driver depends on the iEi WT61P803 PUZZLE MFD driver.
...
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* iEi WT61P803 PUZZLE MCU HWMON Driver
Shouldn't be
/*
* IEI ...
?
...
> +/**
> + * struct iei_wt61p803_puzzle_thermal_cooling_device - Thermal cooling device instance
> + *
Please, remove all these blank lines in kernel doc descriptions.
> + * @mcu_hwmon: MCU HWMON struct pointer
> + * @tcdev: Thermal cooling device pointer
> + * @name: Thermal cooling device name
> + * @pwm_channel: PWM channel (0 or 1)
> + * @cooling_levels: Thermal cooling device cooling levels
> + */
...
> +struct iei_wt61p803_puzzle_hwmon {
> + struct iei_wt61p803_puzzle *mcu;
> + unsigned char *response_buffer;
> + bool thermal_cooling_dev_present[IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_NUM];
> + struct iei_wt61p803_puzzle_thermal_cooling_device
> + *cdev[IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_NUM];
Isn't this constant a bit too long? Perhaps drop NUM (MAX would
suffice I think) for a starter.
> +};
...
> + static unsigned char temp_sensor_ntc_cmd[4] = {
> + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> + IEI_WT61P803_PUZZLE_CMD_TEMP,
> + IEI_WT61P803_PUZZLE_CMD_TEMP_ALL
+ comma.
> + };
Why not to be consistent with the rest assignments, choose either
above form, or like you have done in the below functions.
Also, why 4?
> + size_t reply_size = 0;
How is it used in all these functions?
> + int ret;
> +
> + ret = iei_wt61p803_puzzle_write_command(mcu_hwmon->mcu, temp_sensor_ntc_cmd,
> + sizeof(temp_sensor_ntc_cmd), resp_buf,
> + &reply_size);
> +
> + if (ret)
> + return ret;
> +
> + /* Check the number of NTC values (should be 0x32/'2') */
> + if (resp_buf[3] != 0x32)
Instead of comment in the parentheses, just do it here
" != '2')"
> + return -EIO;
...
> +static int iei_wt61p803_puzzle_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *val)
> +{
> + struct iei_wt61p803_puzzle_hwmon *mcu_hwmon = dev_get_drvdata(dev->parent);
> + int ret;
> +
> + switch (type) {
> + case hwmon_pwm:
> + ret = iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, channel, val);
> + return ret;
return iei_...(...);
in all such cases.
> + case hwmon_fan:
> + ret = iei_wt61p803_puzzle_read_fan_speed(mcu_hwmon, channel, val);
> + return ret;
> + case hwmon_temp:
> + ret = iei_wt61p803_puzzle_read_temp_sensor(mcu_hwmon, channel, val);
> + return ret;
> + default:
> + return -EINVAL;
> + }
> +}
...
> +static umode_t iei_wt61p803_puzzle_is_visible(const void *data, enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + switch (type) {
> + case hwmon_pwm:
> + switch (attr) {
> + case hwmon_pwm_input:
> + return 0644;
> + default:
> + return 0;
> + }
Isn't too long for
if (attr == ...)
return 0644;
break;
...see below...
> + case hwmon_fan:
> + switch (attr) {
> + case hwmon_fan_input:
> + return 0444;
> + default:
> + return 0;
> + }
> + case hwmon_temp:
> + switch (attr) {
> + case hwmon_temp_input:
> + return 0444;
> + default:
> + return 0;
> + }
> + default:
> + return 0;
break;
> + }
return 0;
?
> +}
...
> + mcu_hwmon->thermal_cooling_dev_present[pwm_channel] = true;
> +
> + num_levels = fwnode_property_read_u8_array(child, "cooling-levels", NULL, 0);
fwnode_property_count_u8()
> + if (num_levels > 0) {
You can improve readability by reducing indentation level via
replacement to negative conditional.
> + cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
> + if (!cdev)
> + return -ENOMEM;
> +
> + cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
For the sake of cleaness, shouldn't it be devm_kmalloc_array() ?
(Note, zeroing is not needed if you read entire array)
> + if (!cdev->cooling_levels)
> + return -ENOMEM;
> +
> + ret = fwnode_property_read_u8_array(child, "cooling-levels",
> + cdev->cooling_levels,
> + num_levels);
> + if (ret) {
> + dev_err(dev, "Couldn't read property 'cooling-levels'");
> + return ret;
> + }
> +
> + snprintf(cdev->name, THERMAL_NAME_LENGTH, "iei_wt61p803_puzzle_%d", pwm_channel);
> +
> + cdev->tcdev = devm_thermal_of_cooling_device_register(dev, NULL,
> + cdev->name, cdev, &iei_wt61p803_puzzle_cooling_ops);
> + if (IS_ERR(cdev->tcdev))
> + return PTR_ERR(cdev->tcdev);
> +
> + cdev->mcu_hwmon = mcu_hwmon;
> + cdev->pwm_channel = pwm_channel;
> +
> + mcu_hwmon->cdev[pwm_channel] = cdev;
> + }
> + return 0;
> +}
--
With Best Regards,
Andy Shevchenko
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