Re: [PATCH v4 3/6] drivers: hwmon: Add the iEi WT61P803 PUZZLE HWMON driver

From: Luka Kovacic
Date: Wed Oct 14 2020 - 14:25:27 EST

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Hello Guenter,

On Tue, Oct 13, 2020 at 8:51 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
>
> On 10/13/20 11:09 AM, Luka Kovacic wrote:
> > Hello Guenter,
> >
> > On Sun, Oct 11, 2020 at 11:26 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> >>
> >> On Wed, Oct 07, 2020 at 02:48:58AM +0200, Luka Kovacic 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.
> >>>
> >>> Signed-off-by: Luka Kovacic <luka.kovacic@xxxxxxxxxx>
> >>> Cc: Luka Perkov <luka.perkov@xxxxxxxxxx>
> >>> Cc: Robert Marko <robert.marko@xxxxxxxxxx>
> >>> ---
> >>> drivers/hwmon/Kconfig | 8 +
> >>> drivers/hwmon/Makefile | 1 +
> >>> drivers/hwmon/iei-wt61p803-puzzle-hwmon.c | 457 ++++++++++++++++++++++
> >>> 3 files changed, 466 insertions(+)
> >>> create mode 100644 drivers/hwmon/iei-wt61p803-puzzle-hwmon.c
> >>>
> >>> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> >>> index 8dc28b26916e..ff279df9bf40 100644
> >>> --- a/drivers/hwmon/Kconfig
> >>> +++ b/drivers/hwmon/Kconfig
> >>> @@ -722,6 +722,14 @@ config SENSORS_IBMPOWERNV
> >>> This driver can also be built as a module. If so, the module
> >>> will be called ibmpowernv.
> >>>
> >>> +config SENSORS_IEI_WT61P803_PUZZLE_HWMON
> >>> + tristate "iEi WT61P803 PUZZLE MFD HWMON Driver"
> >>> + depends on MFD_IEI_WT61P803_PUZZLE
> >>> + help
> >>> + The iEi WT61P803 PUZZLE MFD HWMON Driver handles reading fan speed
> >>> + and writing fan PWM values. It also supports reading on-board
> >>> + temperature sensors.
> >>> +
> >>> config SENSORS_IIO_HWMON
> >>> tristate "Hwmon driver that uses channels specified via iio maps"
> >>> depends on IIO
> >>> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> >>> index a8f4b35b136b..b0afb2d6896f 100644
> >>> --- a/drivers/hwmon/Makefile
> >>> +++ b/drivers/hwmon/Makefile
> >>> @@ -83,6 +83,7 @@ obj-$(CONFIG_SENSORS_HIH6130) += hih6130.o
> >>> obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
> >>> obj-$(CONFIG_SENSORS_I5500) += i5500_temp.o
> >>> obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
> >>> +obj-$(CONFIG_SENSORS_IEI_WT61P803_PUZZLE_HWMON) += iei-wt61p803-puzzle-hwmon.o
> >>> obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
> >>> obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
> >>> obj-$(CONFIG_SENSORS_IBMPOWERNV)+= ibmpowernv.o
> >>> diff --git a/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c b/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c
> >>> new file mode 100644
> >>> index 000000000000..be7b019d126c
> >>> --- /dev/null
> >>> +++ b/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c
> >>> @@ -0,0 +1,457 @@
> >>> +// SPDX-License-Identifier: GPL-2.0-only
> >>> +/* iEi WT61P803 PUZZLE MCU HWMON Driver
> >>> + *
> >>> + * Copyright (C) 2020 Sartura Ltd.
> >>> + * Author: Luka Kovacic <luka.kovacic@xxxxxxxxxx>
> >>> + */
> >>> +
> >>> +#include <linux/err.h>
> >>> +#include <linux/hwmon-sysfs.h>
> >>> +#include <linux/hwmon.h>
> >>> +#include <linux/interrupt.h>
> >>> +#include <linux/irq.h>
> >>> +#include <linux/math64.h>
> >>> +#include <linux/mfd/iei-wt61p803-puzzle.h>
> >>> +#include <linux/mod_devicetable.h>
> >>> +#include <linux/module.h>
> >>> +#include <linux/platform_device.h>
> >>> +#include <linux/property.h>
> >>> +#include <linux/slab.h>
> >>> +#include <linux/thermal.h>
> >>> +
> >>> +#define IEI_WT61P803_PUZZLE_HWMON_MAX_TEMP_NUM 2
> >>> +#define IEI_WT61P803_PUZZLE_HWMON_MAX_FAN_NUM 5
> >>> +#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_NUM 2
> >>> +#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_VAL 255
> >>> +
> >>> +/**
> >>> + * struct iei_wt61p803_puzzle_thermal_cooling_device - Thermal cooling device instance
> >>> + *
> >>> + * @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_thermal_cooling_device {
> >>> + struct iei_wt61p803_puzzle_hwmon *mcu_hwmon;
> >>> + struct thermal_cooling_device *tcdev;
> >>> + char name[THERMAL_NAME_LENGTH];
> >>> + int pwm_channel;
> >>> + u8 *cooling_levels;
> >>> +};
> >>> +
> >>> +/**
> >>> + * struct iei_wt61p803_puzzle_hwmon - MCU HWMON Driver
> >>> + *
> >>> + * @mcu: MCU struct pointer
> >>> + * @response_buffer Global MCU response buffer allocation
> >>> + * @thermal_cooling_dev_present: Per-channel thermal cooling device control
> >>> + * @cdev: Per-channel thermal cooling device private structure
> >>> + */
> >>> +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];
> >>> +};
> >>> +
> >>> +#define raw_temp_to_milidegree_celsius(x) ((int)(((x) - 0x80) * 1000))
> >>> +static int iei_wt61p803_puzzle_read_temp_sensor(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon,
> >>> + int channel, int *value)
> >>> +{
> >>> + unsigned char *resp_buf = mcu_hwmon->response_buffer;
> >>> + unsigned char temp_sensor_ntc_cmd[4] = {
> >>
> >> static ?
> > These can be changed to static to avoid reallocations, every time the
> > function is called.
> > Although I will always have to assign these values anyway.
> >>
> >>> + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> >>> + IEI_WT61P803_PUZZLE_CMD_TEMP,
> >>> + IEI_WT61P803_PUZZLE_CMD_TEMP_ALL
> >>> + };
> >>> + size_t reply_size = 0;
> >>> + 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)
> >>> + return -EIO;
> >>> +
> >>> + *value = raw_temp_to_milidegree_celsius(resp_buf[4 + channel]);
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +#define raw_fan_val_to_rpm(x, y) ((int)(((x) << 8 | (y)) / 2) * 60)
> >>> +static int iei_wt61p803_puzzle_read_fan_speed
> >>> +(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, int channel, int *value)
> >>> +{
> >>> + unsigned char *resp_buf = mcu_hwmon->response_buffer;
> >>> + static const u8 fan_speed_cmds[] = {
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_RPM_0,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_RPM_1,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_RPM_2,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_RPM_3,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_RPM_4
> >>> + };
> >>> + unsigned char fan_speed_cmd[4] = {
> >>> + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_RPM_0
> >>
> >> This is unconditionally overwritten below.
> > I also add it to the array, to make it easier to read if someone is
> > debugging the code.
>
> That doesn't make it easier. It causes everyone (including me) to wonder
> if the overwrite index is wrong, and having to look into details
> to notice that the overwritten value is similar. And that has to be
> repeated for each of the functions over and over again, because
> after all one can not be sure if the submitter maybe got
> some index wrong.
>
> That kind of code in your driver caused me to get stuck on that level
> of review, and I didn't even get to the point where I actually reviewed
> the _real_ code. That kind of code is extremely difficult to review,
> it takes a lot of time to do it, and it can easily result in missing
> the real problems.
>
> Really, code such as
> unsigned char fan_speed_cmd[4] = {};
> ...
>
> fan_speed_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START;
> fan_speed_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN;
> fan_speed_cmd[2] = fan_speed_cmds[channel];
>
> may not look as fancy, but it would be much easier to understand,
> and it would be much easier to see that it does what it is supposed
> to do.
>
> FWIW, the same is true for the actual commands. It is obviously
> your call, but something like
>
> #define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_BASE 'A'
> #define IEI_WT61P803_PUZZLE_CMD_FAN_RPM(x) (IEI_WT61P803_PUZZLE_CMD_FAN_RPM_BASE + (x))
>
> fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM(channel)
>
> would be much easier to understand and be more straightforward
> than all those arrays.
>
> Guenter
>
Understood. That does look easier to understand.

I'll convert the command arrays to reflect this, where the content of the array
is modified before it's sent.
I will also change the commands, where this applies.

Kind regards,
Luka
> >>
> >>> + };
> >>> + size_t reply_size = 0;
> >>> + int ret;
> >>> +
> >>> + fan_speed_cmd[2] = fan_speed_cmds[channel];
> >>> +
> >>> + ret = iei_wt61p803_puzzle_write_command(mcu_hwmon->mcu, fan_speed_cmd,
> >>> + sizeof(fan_speed_cmd), resp_buf,
> >>> + &reply_size);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + *value = raw_fan_val_to_rpm(resp_buf[3], resp_buf[4]);
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +static int iei_wt61p803_puzzle_write_pwm_channel
> >>> +(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, int channel, long pwm_set_val)
> >>> +{
> >>> + unsigned char *resp_buf = mcu_hwmon->response_buffer;
> >>> + static const u8 pwm_set_cmds[] = {
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_PWM_1
> >>> + };
> >>> + unsigned char pwm_set_cmd[6] = {
> >>> + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_PWM_WRITE,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0,
> >>
> >> Another unconditional overwrite.
> >>
> >>> + 0x00
> >>
> >> As is this, and more below. Guess it is on purpose, but I don't
> >> see the point.
> > This one can be removed as it's calculated by the
> > iei_wt61p803_puzzle_write_command
> > function.
> >>
> >>> + };
> >>> + size_t reply_size = 0;
> >>> + int ret;
> >>> +
> >>> + pwm_set_cmd[3] = pwm_set_cmds[channel];
> >>> +
> >>> + /* Add the PWM value to the command */
> >>> + pwm_set_cmd[4] = (unsigned char)pwm_set_val;
> >>> +
> >>> + ret = iei_wt61p803_puzzle_write_command(mcu_hwmon->mcu, pwm_set_cmd,
> >>> + sizeof(pwm_set_cmd), resp_buf,
> >>> + &reply_size);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + /* Store the PWM value */
> >>> + if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
> >>> + resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
> >>> + resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK))
> >>> + return -EIO;
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +static int iei_wt61p803_puzzle_read_pwm_channel
> >>> +(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, int channel, int *value)
> >>
> >> I am sure I mentioned before that I don't like those odd follow-up line
> >> indentations.
> > I'll fix these, sorry.
> >>
> >>> +{
> >>> + unsigned char *resp_buf = mcu_hwmon->response_buffer;
> >>> + static const u8 pwm_get_cmds[] = {
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_PWM_1
> >>> + };
> >>> + unsigned char pwm_get_cmd[5] = {
> >>> + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ,
> >>> + IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0
> >>> + };
> >>> + size_t reply_size = 0;
> >>> + int ret;
> >>> +
> >>> + pwm_get_cmd[3] = pwm_get_cmds[channel];
> >>> +
> >>> + ret = iei_wt61p803_puzzle_write_command(mcu_hwmon->mcu, pwm_get_cmd,
> >>> + sizeof(pwm_get_cmd), resp_buf,
> >>> + &reply_size);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + if (resp_buf[2] != IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ)
> >>> + return -EIO;
> >>> +
> >>> + *value = resp_buf[3];
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +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, value;
> >>> +
> >>> + switch (type) {
> >>> + case hwmon_pwm:
> >>> + if (attr != hwmon_pwm_input)
> >>> + return -ENODEV;
> >>
> >> Those are all unnecessary tests, and -ENODEV is wrong.
> > Okay, I can remove the attr tests.
> >>
> >>> + ret = iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, channel, &value);
> >>> + if (ret)
> >>> + return ret;
> >>> + *val = (long)value;
> >>
> >> Unnecessary type cast. The return value of this function is _always_
> >> type casted, which really doesn't make sense.
> >>
> >>> + return ret;
> >>> + case hwmon_fan:
> >>> + if (attr != hwmon_fan_input)
> >>> + return -ENODEV;
> >>> + ret = iei_wt61p803_puzzle_read_fan_speed(mcu_hwmon, channel, &value);
> >>> + if (ret)
> >>> + return ret;
> >>> + *val = (long)value;
> >>> + return ret;
> >>> + case hwmon_temp:
> >>> + if (attr != hwmon_temp_input)
> >>> + return -ENODEV;
> >>> + ret = iei_wt61p803_puzzle_read_temp_sensor(mcu_hwmon, channel, &value);
> >>> + if (ret)
> >>> + return ret;
> >>> + *val = (long)value;
> >>
> >> Hmm, seems like you like type casts. Ok, I'll want to see an explanation
> >> for each of those: Explain why the function argument is an int *, and
> >> explain why the it is necessary to type cast the result here.
> > I'll change the function argument to long * to avoid these.
> >>
> >>> + return ret;
> >>> + default:
> >>> + return -ENODEV;
> >>> + }
> >>> +}
> >>> +
> >>> +static int iei_wt61p803_puzzle_write(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);
> >>> +
> >>> + if (attr != hwmon_pwm_input)
> >>> + return -ENODEV;
> >>> + if (mcu_hwmon->thermal_cooling_dev_present[channel]) {
> >>> + /*
> >>> + * The Thermal Framework has already claimed this specific PWM
> >>> + * channel.
> >>
> >> ... and if it did, this code won't be called. I am sure I mentioned
> >> this before. If you insist keeping it, I'll want to see an explanation
> >> here because I don't want to have to deal with follow-up patches removing
> >> the unnecessary code.
> > In the previous patch this was done here and by setting the visibility
> > (umode_t).
> > I'd rather return an error with more context to the user instead of
> > just changing
> > the permissions on the sysfs attribute.
> >>
> >>> + */
> >>> + return -EBUSY;
> >>> + }
> >>> + return iei_wt61p803_puzzle_write_pwm_channel(mcu_hwmon, channel, val);
> >>> +}
> >>> +
> >>> +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;
> >>> + }
> >>> + 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;
> >>> + }
> >>> +}
> >>> +
> >>> +static const struct hwmon_ops iei_wt61p803_puzzle_hwmon_ops = {
> >>> + .is_visible = iei_wt61p803_puzzle_is_visible,
> >>> + .read = iei_wt61p803_puzzle_read,
> >>> + .write = iei_wt61p803_puzzle_write,
> >>> +};
> >>> +
> >>> +static const struct hwmon_channel_info *iei_wt61p803_puzzle_info[] = {
> >>> + HWMON_CHANNEL_INFO(pwm,
> >>> + HWMON_PWM_INPUT,
> >>> + HWMON_PWM_INPUT),
> >>> + HWMON_CHANNEL_INFO(fan,
> >>> + HWMON_F_INPUT,
> >>> + HWMON_F_INPUT,
> >>> + HWMON_F_INPUT,
> >>> + HWMON_F_INPUT,
> >>> + HWMON_F_INPUT),
> >>> + HWMON_CHANNEL_INFO(temp,
> >>> + HWMON_T_INPUT,
> >>> + HWMON_T_INPUT),
> >>> + NULL
> >>> +};
> >>> +
> >>> +static const struct hwmon_chip_info iei_wt61p803_puzzle_chip_info = {
> >>> + .ops = &iei_wt61p803_puzzle_hwmon_ops,
> >>> + .info = iei_wt61p803_puzzle_info,
> >>> +};
> >>> +
> >>> +static int iei_wt61p803_puzzle_get_max_state(struct thermal_cooling_device *tcdev,
> >>> + unsigned long *state)
> >>> +{
> >>> + *state = IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_VAL;
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +static int iei_wt61p803_puzzle_get_cur_state(struct thermal_cooling_device *tcdev,
> >>> + unsigned long *state)
> >>> +{
> >>> + struct iei_wt61p803_puzzle_thermal_cooling_device *cdev = tcdev->devdata;
> >>> + struct iei_wt61p803_puzzle_hwmon *mcu_hwmon = cdev->mcu_hwmon;
> >>> +
> >>> + int ret, value;
> >>> +
> >>> + if (!mcu_hwmon)
> >>> + return -EINVAL;
> >>
> >> This check needs to be explained.
> > This is not needed and will be removed.
> >>
> >>> +
> >>> + ret = iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, cdev->pwm_channel, &value);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + *state = (unsigned long)value;
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +static int iei_wt61p803_puzzle_set_cur_state
> >>> +(struct thermal_cooling_device *tcdev, unsigned long state)
> >>> +{
> >>> + struct iei_wt61p803_puzzle_thermal_cooling_device *cdev = tcdev->devdata;
> >>> + struct iei_wt61p803_puzzle_hwmon *mcu_hwmon = cdev->mcu_hwmon;
> >>> +
> >>> + if (!mcu_hwmon)
> >>> + return -EINVAL;
> >>> +
> >>> + return iei_wt61p803_puzzle_write_pwm_channel(mcu_hwmon, cdev->pwm_channel, state);
> >>> +}
> >>> +
> >>> +static const struct thermal_cooling_device_ops iei_wt61p803_puzzle_cooling_ops = {
> >>> + .get_max_state = iei_wt61p803_puzzle_get_max_state,
> >>> + .get_cur_state = iei_wt61p803_puzzle_get_cur_state,
> >>> + .set_cur_state = iei_wt61p803_puzzle_set_cur_state,
> >>> +};
> >>> +
> >>> +static int iei_wt61p803_puzzle_enable_thermal_cooling_dev
> >>> +(struct device *dev, struct fwnode_handle *child, struct iei_wt61p803_puzzle_hwmon *mcu_hwmon)
> >>> +{
> >>> + struct iei_wt61p803_puzzle_thermal_cooling_device *cdev;
> >>> + int ret, num_levels;
> >>> + u32 pwm_channel;
> >>> +
> >>> + ret = fwnode_property_read_u32(child, "reg", &pwm_channel);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + mcu_hwmon->thermal_cooling_dev_present[pwm_channel] = true;
> >>> +
> >>> + num_levels = fwnode_property_read_u8_array(child, "cooling-levels", NULL, 0);
> >>> + if (num_levels > 0) {
> >>> + cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
> >>> + if (!cdev)
> >>> + return -ENOMEM;
> >>> +
> >>> + cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
> >>> + 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;
> >>> +}
> >>> +
> >>> +static int iei_wt61p803_puzzle_hwmon_probe(struct platform_device *pdev)
> >>> +{
> >>> + struct device *dev = &pdev->dev;
> >>> + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev->parent);
> >>> + struct iei_wt61p803_puzzle_hwmon *mcu_hwmon;
> >>> + struct fwnode_handle *child;
> >>> + struct device *hwmon_dev;
> >>> + int ret;
> >>> +
> >>> + mcu_hwmon = devm_kzalloc(dev, sizeof(*mcu_hwmon), GFP_KERNEL);
> >>> + if (!mcu_hwmon)
> >>> + return -ENOMEM;
> >>> +
> >>> + mcu_hwmon->response_buffer = devm_kzalloc(dev, IEI_WT61P803_PUZZLE_BUF_SIZE, GFP_KERNEL);
> >>> + if (!mcu_hwmon->response_buffer)
> >>> + return -ENOMEM;
> >>> +
> >>> + mcu_hwmon->mcu = mcu;
> >>> + platform_set_drvdata(pdev, mcu_hwmon);
> >>> +
> >>> + hwmon_dev = devm_hwmon_device_register_with_info(dev, "iei_wt61p803_puzzle",
> >>> + mcu_hwmon,
> >>> + &iei_wt61p803_puzzle_chip_info,
> >>> + NULL);
> >>> +
> >>> + if (IS_ERR(hwmon_dev))
> >>> + return PTR_ERR(hwmon_dev);
> >>> +
> >>> + /* Control fans via PWM lines via Linux Kernel */
> >>> + if (IS_ENABLED(CONFIG_THERMAL)) {
> >>> + device_for_each_child_node(dev, child) {
> >>> + ret = iei_wt61p803_puzzle_enable_thermal_cooling_dev(dev, child, mcu_hwmon);
> >>> + if (ret) {
> >>> + dev_err(dev, "Enabling the PWM fan failed\n");
> >>> + fwnode_handle_put(child);
> >>> + return ret;
> >>> + }
> >>> + }
> >>> + }
> >>> + return 0;
> >>> +}
> >>> +
> >>> +static const struct of_device_id iei_wt61p803_puzzle_hwmon_id_table[] = {
> >>> + { .compatible = "iei,wt61p803-puzzle-hwmon" },
> >>> + {}
> >>> +};
> >>> +MODULE_DEVICE_TABLE(of, iei_wt61p803_puzzle_hwmon_id_table);
> >>> +
> >>> +static struct platform_driver iei_wt61p803_puzzle_hwmon_driver = {
> >>> + .driver = {
> >>> + .name = "iei-wt61p803-puzzle-hwmon",
> >>> + .of_match_table = iei_wt61p803_puzzle_hwmon_id_table,
> >>> + },
> >>> + .probe = iei_wt61p803_puzzle_hwmon_probe,
> >>> +};
> >>> +
> >>> +module_platform_driver(iei_wt61p803_puzzle_hwmon_driver);
> >>> +
> >>> +MODULE_DESCRIPTION("iEi WT61P803 PUZZLE MCU HWMON Driver");
> >>> +MODULE_AUTHOR("Luka Kovacic <luka.kovacic@xxxxxxxxxx>");
> >>> +MODULE_LICENSE("GPL");
> >>> --
> >>> 2.26.2
> >>>
> >
> > Kind regards,
> > Luka
> >
>

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