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linux/drivers/hwmon/lenovo-ec-sensors.c
David Ober 70118f85e6 hwmon: Add EC Chip driver for Lenovo ThinkStation motherboards 
This addition adds in the ability for the system to scan
the EC chip in the Lenovo ThinkStation systems to get the
current fan RPM speeds the Maximum speed value for each
fan also provides the CPU, DIMM other thermal statuses

Signed-off-by: David Ober <dober6023@gmail.com>
Link: https://lore.kernel.org/r/20240328121250.331146-1-dober6023@gmail.com
[groeck: Dropped pointless case statements]
[Colin King: Fixed spelling error accesssible -> accessible]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2024-04-30 10:31:26 -07:00

603 lines
16 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* HWMON driver for Lenovo ThinkStation based workstations
* via the embedded controller registers
*
* Copyright (C) 2024 David Ober (Lenovo) <dober@lenovo.com>
*
* EC provides:
* - CPU temperature
* - DIMM temperature
* - Chassis zone temperatures
* - CPU fan RPM
* - DIMM fan RPM
* - Chassis fans RPM
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/units.h>
#define MCHP_SING_IDX 0x0000
#define MCHP_EMI0_APPLICATION_ID 0x090C
#define MCHP_EMI0_EC_ADDRESS 0x0902
#define MCHP_EMI0_EC_DATA_BYTE0 0x0904
#define MCHP_EMI0_EC_DATA_BYTE1 0x0905
#define MCHP_EMI0_EC_DATA_BYTE2 0x0906
#define MCHP_EMI0_EC_DATA_BYTE3 0x0907
#define IO_REGION_START 0x0900
#define IO_REGION_LENGTH 0xD
static inline u8
get_ec_reg(unsigned char page, unsigned char index)
{
u8 onebyte;
unsigned short m_index;
unsigned short phy_index = page * 256 + index;
outb_p(0x01, MCHP_EMI0_APPLICATION_ID);
m_index = phy_index & GENMASK(14, 2);
outw_p(m_index, MCHP_EMI0_EC_ADDRESS);
onebyte = inb_p(MCHP_EMI0_EC_DATA_BYTE0 + (phy_index & GENMASK(1, 0)));
outb_p(0x01, MCHP_EMI0_APPLICATION_ID); /* write 0x01 again to clean */
return onebyte;
}
enum systems {
LENOVO_PX,
LENOVO_P7,
LENOVO_P5,
LENOVO_P8,
};
static int px_temp_map[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
static const char * const lenovo_px_ec_temp_label[] = {
"CPU1",
"CPU2",
"R_DIMM1",
"L_DIMM1",
"R_DIMM2",
"L_DIMM2",
"PCH",
"M2_R",
"M2_Z1R",
"M2_Z2R",
"PCI_Z1",
"PCI_Z2",
"PCI_Z3",
"PCI_Z4",
"AMB",
};
static int gen_temp_map[] = {0, 2, 3, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
static const char * const lenovo_gen_ec_temp_label[] = {
"CPU1",
"R_DIMM",
"L_DIMM",
"PCH",
"M2_R",
"M2_Z1R",
"M2_Z2R",
"PCI_Z1",
"PCI_Z2",
"PCI_Z3",
"PCI_Z4",
"AMB",
};
static int px_fan_map[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
static const char * const px_ec_fan_label[] = {
"CPU1_Fan",
"CPU2_Fan",
"Front_Fan1-1",
"Front_Fan1-2",
"Front_Fan2",
"Front_Fan3",
"MEM_Fan1",
"MEM_Fan2",
"Rear_Fan1",
"Rear_Fan2",
"Flex_Bay_Fan1",
"Flex_Bay_Fan2",
"Flex_Bay_Fan2",
"PSU_HDD_Fan",
"PSU1_Fan",
"PSU2_Fan",
};
static int p7_fan_map[] = {0, 2, 3, 4, 5, 6, 7, 8, 10, 11, 14};
static const char * const p7_ec_fan_label[] = {
"CPU1_Fan",
"HP_CPU_Fan1",
"HP_CPU_Fan2",
"PCIE1_4_Fan",
"PCIE5_7_Fan",
"MEM_Fan1",
"MEM_Fan2",
"Rear_Fan1",
"BCB_Fan",
"Flex_Bay_Fan",
"PSU_Fan",
};
static int p5_fan_map[] = {0, 5, 6, 7, 8, 10, 11, 14};
static const char * const p5_ec_fan_label[] = {
"CPU_Fan",
"HDD_Fan",
"Duct_Fan1",
"MEM_Fan",
"Rear_Fan",
"Front_Fan",
"Flex_Bay_Fan",
"PSU_Fan",
};
static int p8_fan_map[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14};
static const char * const p8_ec_fan_label[] = {
"CPU1_Fan",
"CPU2_Fan",
"HP_CPU_Fan1",
"HP_CPU_Fan2",
"PCIE1_4_Fan",
"PCIE5_7_Fan",
"DIMM1_Fan1",
"DIMM1_Fan2",
"DIMM2_Fan1",
"DIMM2_Fan2",
"Rear_Fan",
"HDD_Bay_Fan",
"Flex_Bay_Fan",
"PSU_Fan",
};
struct ec_sensors_data {
struct mutex mec_mutex; /* lock for sensor data access */
const char *const *fan_labels;
const char *const *temp_labels;
const int *fan_map;
const int *temp_map;
};
static int
lenovo_ec_do_read_temp(struct ec_sensors_data *data, u32 attr, int channel, long *val)
{
u8 lsb;
switch (attr) {
case hwmon_temp_input:
mutex_lock(&data->mec_mutex);
lsb = get_ec_reg(2, 0x81 + channel);
mutex_unlock(&data->mec_mutex);
if (lsb <= 0x40)
return -ENODATA;
*val = (lsb - 0x40) * 1000;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int
lenovo_ec_do_read_fan(struct ec_sensors_data *data, u32 attr, int channel, long *val)
{
u8 lsb, msb;
channel *= 2;
switch (attr) {
case hwmon_fan_input:
mutex_lock(&data->mec_mutex);
lsb = get_ec_reg(4, 0x20 + channel);
msb = get_ec_reg(4, 0x21 + channel);
mutex_unlock(&data->mec_mutex);
*val = (msb << 8) + lsb;
return 0;
case hwmon_fan_max:
mutex_lock(&data->mec_mutex);
lsb = get_ec_reg(4, 0x40 + channel);
msb = get_ec_reg(4, 0x41 + channel);
mutex_unlock(&data->mec_mutex);
*val = (msb << 8) + lsb;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int
lenovo_ec_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
struct ec_sensors_data *state = dev_get_drvdata(dev);
switch (type) {
case hwmon_temp:
*str = state->temp_labels[channel];
return 0;
case hwmon_fan:
*str = state->fan_labels[channel];
return 0;
default:
return -EOPNOTSUPP;
}
}
static int
lenovo_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct ec_sensors_data *data = dev_get_drvdata(dev);
switch (type) {
case hwmon_temp:
return lenovo_ec_do_read_temp(data, attr, data->temp_map[channel], val);
case hwmon_fan:
return lenovo_ec_do_read_fan(data, attr, data->fan_map[channel], val);
default:
return -EOPNOTSUPP;
}
}
static umode_t
lenovo_ec_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_temp:
if (attr == hwmon_temp_input || attr == hwmon_temp_label)
return 0444;
return 0;
case hwmon_fan:
if (attr == hwmon_fan_input || attr == hwmon_fan_max || attr == hwmon_fan_label)
return 0444;
return 0;
default:
return 0;
}
}
static const struct hwmon_channel_info *lenovo_ec_hwmon_info_px[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX),
NULL
};
static const struct hwmon_channel_info *lenovo_ec_hwmon_info_p8[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX),
NULL
};
static const struct hwmon_channel_info *lenovo_ec_hwmon_info_p7[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX),
NULL
};
static const struct hwmon_channel_info *lenovo_ec_hwmon_info_p5[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MAX),
NULL
};
static const struct hwmon_ops lenovo_ec_hwmon_ops = {
.is_visible = lenovo_ec_hwmon_is_visible,
.read = lenovo_ec_hwmon_read,
.read_string = lenovo_ec_hwmon_read_string,
};
static struct hwmon_chip_info lenovo_ec_chip_info = {
.ops = &lenovo_ec_hwmon_ops,
};
static const struct dmi_system_id thinkstation_dmi_table[] = {
{
.ident = "LENOVO_PX",
.driver_data = (void *)(long)LENOVO_PX,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "30EU"),
},
},
{
.ident = "LENOVO_PX",
.driver_data = (void *)(long)LENOVO_PX,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "30EV"),
},
},
{
.ident = "LENOVO_P7",
.driver_data = (void *)(long)LENOVO_P7,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "30F2"),
},
},
{
.ident = "LENOVO_P7",
.driver_data = (void *)(long)LENOVO_P7,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "30F3"),
},
},
{
.ident = "LENOVO_P5",
.driver_data = (void *)(long)LENOVO_P5,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "30G9"),
},
},
{
.ident = "LENOVO_P5",
.driver_data = (void *)(long)LENOVO_P5,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "30GA"),
},
},
{
.ident = "LENOVO_P8",
.driver_data = (void *)(long)LENOVO_P8,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "30HH"),
},
},
{
.ident = "LENOVO_P8",
.driver_data = (void *)(long)LENOVO_P8,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "30HJ"),
},
},
{}
};
MODULE_DEVICE_TABLE(dmi, thinkstation_dmi_table);
static int lenovo_ec_probe(struct platform_device *pdev)
{
struct device *hwdev;
struct ec_sensors_data *ec_data;
const struct hwmon_chip_info *chip_info;
struct device *dev = &pdev->dev;
const struct dmi_system_id *dmi_id;
int app_id;
ec_data = devm_kzalloc(dev, sizeof(struct ec_sensors_data), GFP_KERNEL);
if (!ec_data)
return -ENOMEM;
if (!request_region(IO_REGION_START, IO_REGION_LENGTH, "LNV-WKS")) {
pr_err(":request fail\n");
return -EIO;
}
dev_set_drvdata(dev, ec_data);
chip_info = &lenovo_ec_chip_info;
mutex_init(&ec_data->mec_mutex);
mutex_lock(&ec_data->mec_mutex);
app_id = inb_p(MCHP_EMI0_APPLICATION_ID);
if (app_id) /* check EMI Application ID Value */
outb_p(app_id, MCHP_EMI0_APPLICATION_ID); /* set EMI Application ID to 0 */
outw_p(MCHP_SING_IDX, MCHP_EMI0_EC_ADDRESS);
mutex_unlock(&ec_data->mec_mutex);
if ((inb_p(MCHP_EMI0_EC_DATA_BYTE0) != 'M') &&
(inb_p(MCHP_EMI0_EC_DATA_BYTE1) != 'C') &&
(inb_p(MCHP_EMI0_EC_DATA_BYTE2) != 'H') &&
(inb_p(MCHP_EMI0_EC_DATA_BYTE3) != 'P')) {
release_region(IO_REGION_START, IO_REGION_LENGTH);
return -ENODEV;
}
dmi_id = dmi_first_match(thinkstation_dmi_table);
switch ((long)dmi_id->driver_data) {
case 0:
ec_data->fan_labels = px_ec_fan_label;
ec_data->temp_labels = lenovo_px_ec_temp_label;
ec_data->fan_map = px_fan_map;
ec_data->temp_map = px_temp_map;
lenovo_ec_chip_info.info = lenovo_ec_hwmon_info_px;
break;
case 1:
ec_data->fan_labels = p7_ec_fan_label;
ec_data->temp_labels = lenovo_gen_ec_temp_label;
ec_data->fan_map = p7_fan_map;
ec_data->temp_map = gen_temp_map;
lenovo_ec_chip_info.info = lenovo_ec_hwmon_info_p7;
break;
case 2:
ec_data->fan_labels = p5_ec_fan_label;
ec_data->temp_labels = lenovo_gen_ec_temp_label;
ec_data->fan_map = p5_fan_map;
ec_data->temp_map = gen_temp_map;
lenovo_ec_chip_info.info = lenovo_ec_hwmon_info_p5;
break;
case 3:
ec_data->fan_labels = p8_ec_fan_label;
ec_data->temp_labels = lenovo_gen_ec_temp_label;
ec_data->fan_map = p8_fan_map;
ec_data->temp_map = gen_temp_map;
lenovo_ec_chip_info.info = lenovo_ec_hwmon_info_p8;
break;
default:
release_region(IO_REGION_START, IO_REGION_LENGTH);
return -ENODEV;
}
hwdev = devm_hwmon_device_register_with_info(dev, "lenovo_ec",
ec_data,
chip_info, NULL);
return PTR_ERR_OR_ZERO(hwdev);
}
static struct platform_driver lenovo_ec_sensors_platform_driver = {
.driver = {
.name = "lenovo-ec-sensors",
},
.probe = lenovo_ec_probe,
};
static struct platform_device *lenovo_ec_sensors_platform_device;
static int __init lenovo_ec_init(void)
{
if (!dmi_check_system(thinkstation_dmi_table))
return -ENODEV;
lenovo_ec_sensors_platform_device =
platform_create_bundle(&lenovo_ec_sensors_platform_driver,
lenovo_ec_probe, NULL, 0, NULL, 0);
if (IS_ERR(lenovo_ec_sensors_platform_device)) {
release_region(IO_REGION_START, IO_REGION_LENGTH);
return PTR_ERR(lenovo_ec_sensors_platform_device);
}
return 0;
}
module_init(lenovo_ec_init);
static void __exit lenovo_ec_exit(void)
{
release_region(IO_REGION_START, IO_REGION_LENGTH);
platform_device_unregister(lenovo_ec_sensors_platform_device);
platform_driver_unregister(&lenovo_ec_sensors_platform_driver);
}
module_exit(lenovo_ec_exit);
MODULE_AUTHOR("David Ober <dober@lenovo.com>");
MODULE_DESCRIPTION("HWMON driver for sensors accessible via EC in LENOVO motherboards");
MODULE_LICENSE("GPL");
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