| Message ID | 20201025005916.64747-4-luka.kovacic@sartura.hr |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add support for the IEI WT61P803 PUZZLE MCU | expand |
On Sun, Oct 25, 2020 at 02:59:13AM +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@sartura.hr> > Cc: Luka Perkov <luka.perkov@sartura.hr> > Cc: Robert Marko <robert.marko@sartura.hr> > --- > drivers/hwmon/Kconfig | 8 + > drivers/hwmon/Makefile | 1 + > drivers/hwmon/iei-wt61p803-puzzle-hwmon.c | 412 ++++++++++++++++++++++ This requires documentation (Documentation/hwmon/iei-wt61p803-puzzle.rst). > 3 files changed, 421 insertions(+) > create mode 100644 drivers/hwmon/iei-wt61p803-puzzle-hwmon.c > > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > index 8dc28b26916e..e0469384af2a 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..61b06c9e61df > --- /dev/null > +++ b/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c > @@ -0,0 +1,412 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* IEI WT61P803 PUZZLE MCU HWMON Driver > + * > + * Copyright (C) 2020 Sartura Ltd. > + * Author: Luka Kovacic <luka.kovacic@sartura.hr> > + */ > + > +#include <linux/err.h> > +#include <linux/hwmon-sysfs.h> Unnecessary include. > +#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 2 > +#define IEI_WT61P803_PUZZLE_HWMON_MAX_FAN 5 > +#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM 2 > +#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_VAL 255 > + > +/** > + * struct iei_wt61p803_puzzle_thermal_cooling_device - Thermal cooling device instance > + * @mcu_hwmon: Parent driver struct pointer > + * @tcdev: Thermal cooling device pointer > + * @name: Thermal cooling device name > + * @pwm_channel: Controlled PWM channel (0 or 1) > + * @cooling_levels: Thermal cooling device cooling levels (DT) > + */ > +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 indicator > + * @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]; > + struct iei_wt61p803_puzzle_thermal_cooling_device > + *cdev[IEI_WT61P803_PUZZLE_HWMON_MAX_PWM]; > +}; > + > +#define raw_temp_to_milidegree_celsius(x) (((x) - 0x80) * 1000) > +static int iei_wt61p803_puzzle_read_temp_sensor(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, > + int channel, long *value) > +{ > + unsigned char *resp_buf = mcu_hwmon->response_buffer; > + 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, > + }; > + 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; > + > + if (reply_size != 7) > + return -EIO; > + > + /* Check the number of NTC values */ > + if (resp_buf[3] != '2') > + return -EIO; resp_buf always points to mcu_hwmon->response_buffer, yet the use of that buffer is not mutex protected. This will result in race conditions all over the place if there is more than one reader/writer. Guenter > + > + *value = raw_temp_to_milidegree_celsius(resp_buf[4 + channel]); > + > + return 0; > +} > + > +#define raw_fan_val_to_rpm(x, y) ((((x) << 8 | (y)) / 2) * 60) > +static int iei_wt61p803_puzzle_read_fan_speed(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, > + int channel, long *value) > +{ > + unsigned char *resp_buf = mcu_hwmon->response_buffer; > + unsigned char fan_speed_cmd[4] = {}; > + size_t reply_size = 0; > + int ret; > + > + fan_speed_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; > + fan_speed_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; > + fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM(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; > + > + if (reply_size != 7) > + return -EIO; > + > + *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; > + unsigned char pwm_set_cmd[6] = {}; > + size_t reply_size = 0; > + int ret; > + > + pwm_set_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; > + pwm_set_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; > + pwm_set_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_WRITE; > + pwm_set_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM(channel); > + 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; > + > + if (reply_size != 3) > + return -EIO; > + > + 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, long *value) > +{ > + unsigned char *resp_buf = mcu_hwmon->response_buffer; > + unsigned char pwm_get_cmd[5] = {}; > + size_t reply_size = 0; > + int ret; > + > + pwm_get_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; > + pwm_get_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; > + pwm_get_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ; > + pwm_get_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM(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 (reply_size != 5) > + return -EIO; > + > + 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); > + > + switch (type) { > + case hwmon_pwm: > + return iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, channel, val); > + case hwmon_fan: > + return iei_wt61p803_puzzle_read_fan_speed(mcu_hwmon, channel, val); > + case hwmon_temp: > + return iei_wt61p803_puzzle_read_temp_sensor(mcu_hwmon, channel, val); > + default: > + return -EINVAL; > + } > +} > + > +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 -EINVAL; This check is unnecesary. > + if (mcu_hwmon->thermal_cooling_dev_present[channel]) { > + /* > + * The Thermal Framework has already claimed this specific PWM > + * channel. > + */ > + return -EBUSY; > + } The sensor should not be marked as writeable in this case. iei_wt61p803_puzzle_is_visible() should check for the condition and mark the affected attribute(s) read-only. > + 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: > + if (attr == hwmon_pwm_input) > + return 0644; > + break; > + case hwmon_fan: > + if (attr == hwmon_fan_input) > + return 0444; > + break; > + case hwmon_temp: > + if (attr == hwmon_temp_input) > + return 0444; > + break; > + default: > + return 0; > + } > + > + 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; > + long value; > + int ret; > + > + ret = iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, cdev->pwm_channel, &value); > + if (ret) > + return ret; > + > + *state = 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; > + > + 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; > + u32 pwm_channel; > + u8 num_levels; > + int ret; > + > + 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_count_u8(child, "cooling-levels"); > + if (!num_levels) > + return -EINVAL; > + > + cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL); > + if (!cdev) > + return -ENOMEM; > + > + cdev->cooling_levels = devm_kmalloc_array(dev, num_levels, sizeof(u8), 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@sartura.hr>"); > +MODULE_LICENSE("GPL");
Hello Guenter, On Sun, Nov 8, 2020 at 5:51 PM Guenter Roeck <linux@roeck-us.net> wrote: > > On Sun, Oct 25, 2020 at 02:59:13AM +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@sartura.hr> > > Cc: Luka Perkov <luka.perkov@sartura.hr> > > Cc: Robert Marko <robert.marko@sartura.hr> > > --- > > drivers/hwmon/Kconfig | 8 + > > drivers/hwmon/Makefile | 1 + > > drivers/hwmon/iei-wt61p803-puzzle-hwmon.c | 412 ++++++++++++++++++++++ > > This requires documentation (Documentation/hwmon/iei-wt61p803-puzzle.rst). Okay, I'll add it. > > > > 3 files changed, 421 insertions(+) > > create mode 100644 drivers/hwmon/iei-wt61p803-puzzle-hwmon.c > > > > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > > index 8dc28b26916e..e0469384af2a 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..61b06c9e61df > > --- /dev/null > > +++ b/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c > > @@ -0,0 +1,412 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* IEI WT61P803 PUZZLE MCU HWMON Driver > > + * > > + * Copyright (C) 2020 Sartura Ltd. > > + * Author: Luka Kovacic <luka.kovacic@sartura.hr> > > + */ > > + > > +#include <linux/err.h> > > +#include <linux/hwmon-sysfs.h> > > Unnecessary include. > > > +#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 2 > > +#define IEI_WT61P803_PUZZLE_HWMON_MAX_FAN 5 > > +#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM 2 > > +#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_VAL 255 > > + > > +/** > > + * struct iei_wt61p803_puzzle_thermal_cooling_device - Thermal cooling device instance > > + * @mcu_hwmon: Parent driver struct pointer > > + * @tcdev: Thermal cooling device pointer > > + * @name: Thermal cooling device name > > + * @pwm_channel: Controlled PWM channel (0 or 1) > > + * @cooling_levels: Thermal cooling device cooling levels (DT) > > + */ > > +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 indicator > > + * @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]; > > + struct iei_wt61p803_puzzle_thermal_cooling_device > > + *cdev[IEI_WT61P803_PUZZLE_HWMON_MAX_PWM]; > > +}; > > + > > +#define raw_temp_to_milidegree_celsius(x) (((x) - 0x80) * 1000) > > +static int iei_wt61p803_puzzle_read_temp_sensor(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, > > + int channel, long *value) > > +{ > > + unsigned char *resp_buf = mcu_hwmon->response_buffer; > > + 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, > > + }; > > + 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; > > + > > + if (reply_size != 7) > > + return -EIO; > > + > > + /* Check the number of NTC values */ > > + if (resp_buf[3] != '2') > > + return -EIO; > > resp_buf always points to mcu_hwmon->response_buffer, yet the use of that buffer is > not mutex protected. This will result in race conditions all over the place > if there is more than one reader/writer. Okay, I can add a mutex for the buffer. > > Guenter > > > + > > + *value = raw_temp_to_milidegree_celsius(resp_buf[4 + channel]); > > + > > + return 0; > > +} > > + > > +#define raw_fan_val_to_rpm(x, y) ((((x) << 8 | (y)) / 2) * 60) > > +static int iei_wt61p803_puzzle_read_fan_speed(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, > > + int channel, long *value) > > +{ > > + unsigned char *resp_buf = mcu_hwmon->response_buffer; > > + unsigned char fan_speed_cmd[4] = {}; > > + size_t reply_size = 0; > > + int ret; > > + > > + fan_speed_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; > > + fan_speed_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; > > + fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM(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; > > + > > + if (reply_size != 7) > > + return -EIO; > > + > > + *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; > > + unsigned char pwm_set_cmd[6] = {}; > > + size_t reply_size = 0; > > + int ret; > > + > > + pwm_set_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; > > + pwm_set_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; > > + pwm_set_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_WRITE; > > + pwm_set_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM(channel); > > + 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; > > + > > + if (reply_size != 3) > > + return -EIO; > > + > > + 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, long *value) > > +{ > > + unsigned char *resp_buf = mcu_hwmon->response_buffer; > > + unsigned char pwm_get_cmd[5] = {}; > > + size_t reply_size = 0; > > + int ret; > > + > > + pwm_get_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; > > + pwm_get_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; > > + pwm_get_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ; > > + pwm_get_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM(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 (reply_size != 5) > > + return -EIO; > > + > > + 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); > > + > > + switch (type) { > > + case hwmon_pwm: > > + return iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, channel, val); > > + case hwmon_fan: > > + return iei_wt61p803_puzzle_read_fan_speed(mcu_hwmon, channel, val); > > + case hwmon_temp: > > + return iei_wt61p803_puzzle_read_temp_sensor(mcu_hwmon, channel, val); > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +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 -EINVAL; > > This check is unnecesary. Ok, I'll remove it. > > > + if (mcu_hwmon->thermal_cooling_dev_present[channel]) { > > + /* > > + * The Thermal Framework has already claimed this specific PWM > > + * channel. > > + */ > > + return -EBUSY; > > + } > > The sensor should not be marked as writeable in this case. > iei_wt61p803_puzzle_is_visible() should check for the condition and > mark the affected attribute(s) read-only. Ok, I'll move the condition to iei_wt61p803_puzzle_is_visible(). > > > + 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: > > + if (attr == hwmon_pwm_input) > > + return 0644; > > + break; > > + case hwmon_fan: > > + if (attr == hwmon_fan_input) > > + return 0444; > > + break; > > + case hwmon_temp: > > + if (attr == hwmon_temp_input) > > + return 0444; > > + break; > > + default: > > + return 0; > > + } > > + > > + 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; > > + long value; > > + int ret; > > + > > + ret = iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, cdev->pwm_channel, &value); > > + if (ret) > > + return ret; > > + > > + *state = 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; > > + > > + 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; > > + u32 pwm_channel; > > + u8 num_levels; > > + int ret; > > + > > + 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_count_u8(child, "cooling-levels"); > > + if (!num_levels) > > + return -EINVAL; > > + > > + cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL); > > + if (!cdev) > > + return -ENOMEM; > > + > > + cdev->cooling_levels = devm_kmalloc_array(dev, num_levels, sizeof(u8), 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@sartura.hr>"); > > +MODULE_LICENSE("GPL"); Kind regards, Luka
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 8dc28b26916e..e0469384af2a 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..61b06c9e61df --- /dev/null +++ b/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c @@ -0,0 +1,412 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* IEI WT61P803 PUZZLE MCU HWMON Driver + * + * Copyright (C) 2020 Sartura Ltd. + * Author: Luka Kovacic <luka.kovacic@sartura.hr> + */ + +#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 2 +#define IEI_WT61P803_PUZZLE_HWMON_MAX_FAN 5 +#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM 2 +#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_VAL 255 + +/** + * struct iei_wt61p803_puzzle_thermal_cooling_device - Thermal cooling device instance + * @mcu_hwmon: Parent driver struct pointer + * @tcdev: Thermal cooling device pointer + * @name: Thermal cooling device name + * @pwm_channel: Controlled PWM channel (0 or 1) + * @cooling_levels: Thermal cooling device cooling levels (DT) + */ +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 indicator + * @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]; + struct iei_wt61p803_puzzle_thermal_cooling_device + *cdev[IEI_WT61P803_PUZZLE_HWMON_MAX_PWM]; +}; + +#define raw_temp_to_milidegree_celsius(x) (((x) - 0x80) * 1000) +static int iei_wt61p803_puzzle_read_temp_sensor(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, + int channel, long *value) +{ + unsigned char *resp_buf = mcu_hwmon->response_buffer; + 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, + }; + 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; + + if (reply_size != 7) + return -EIO; + + /* Check the number of NTC values */ + if (resp_buf[3] != '2') + return -EIO; + + *value = raw_temp_to_milidegree_celsius(resp_buf[4 + channel]); + + return 0; +} + +#define raw_fan_val_to_rpm(x, y) ((((x) << 8 | (y)) / 2) * 60) +static int iei_wt61p803_puzzle_read_fan_speed(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, + int channel, long *value) +{ + unsigned char *resp_buf = mcu_hwmon->response_buffer; + unsigned char fan_speed_cmd[4] = {}; + size_t reply_size = 0; + int ret; + + fan_speed_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; + fan_speed_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; + fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM(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; + + if (reply_size != 7) + return -EIO; + + *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; + unsigned char pwm_set_cmd[6] = {}; + size_t reply_size = 0; + int ret; + + pwm_set_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; + pwm_set_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; + pwm_set_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_WRITE; + pwm_set_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM(channel); + 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; + + if (reply_size != 3) + return -EIO; + + 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, long *value) +{ + unsigned char *resp_buf = mcu_hwmon->response_buffer; + unsigned char pwm_get_cmd[5] = {}; + size_t reply_size = 0; + int ret; + + pwm_get_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START; + pwm_get_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FAN; + pwm_get_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ; + pwm_get_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM(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 (reply_size != 5) + return -EIO; + + 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); + + switch (type) { + case hwmon_pwm: + return iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, channel, val); + case hwmon_fan: + return iei_wt61p803_puzzle_read_fan_speed(mcu_hwmon, channel, val); + case hwmon_temp: + return iei_wt61p803_puzzle_read_temp_sensor(mcu_hwmon, channel, val); + default: + return -EINVAL; + } +} + +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 -EINVAL; + if (mcu_hwmon->thermal_cooling_dev_present[channel]) { + /* + * The Thermal Framework has already claimed this specific PWM + * channel. + */ + 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: + if (attr == hwmon_pwm_input) + return 0644; + break; + case hwmon_fan: + if (attr == hwmon_fan_input) + return 0444; + break; + case hwmon_temp: + if (attr == hwmon_temp_input) + return 0444; + break; + default: + return 0; + } + + 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; + long value; + int ret; + + ret = iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, cdev->pwm_channel, &value); + if (ret) + return ret; + + *state = 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; + + 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; + u32 pwm_channel; + u8 num_levels; + int ret; + + 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_count_u8(child, "cooling-levels"); + if (!num_levels) + return -EINVAL; + + cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL); + if (!cdev) + return -ENOMEM; + + cdev->cooling_levels = devm_kmalloc_array(dev, num_levels, sizeof(u8), 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@sartura.hr>"); +MODULE_LICENSE("GPL");
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@sartura.hr> Cc: Luka Perkov <luka.perkov@sartura.hr> Cc: Robert Marko <robert.marko@sartura.hr> --- drivers/hwmon/Kconfig | 8 + drivers/hwmon/Makefile | 1 + drivers/hwmon/iei-wt61p803-puzzle-hwmon.c | 412 ++++++++++++++++++++++ 3 files changed, 421 insertions(+) create mode 100644 drivers/hwmon/iei-wt61p803-puzzle-hwmon.c