summaryrefslogtreecommitdiff
path: root/sys-kernel/linux-image-redcore-lts/files/5.10-add-sbtsi_driver.patch
diff options
context:
space:
mode:
Diffstat (limited to 'sys-kernel/linux-image-redcore-lts/files/5.10-add-sbtsi_driver.patch')
-rw-r--r--sys-kernel/linux-image-redcore-lts/files/5.10-add-sbtsi_driver.patch285
1 files changed, 285 insertions, 0 deletions
diff --git a/sys-kernel/linux-image-redcore-lts/files/5.10-add-sbtsi_driver.patch b/sys-kernel/linux-image-redcore-lts/files/5.10-add-sbtsi_driver.patch
new file mode 100644
index 00000000..13035071
--- /dev/null
+++ b/sys-kernel/linux-image-redcore-lts/files/5.10-add-sbtsi_driver.patch
@@ -0,0 +1,285 @@
+diff -Naur linux-5.10.2/drivers/hwmon/Kconfig linux-5.10.2-p/drivers/hwmon/Kconfig
+--- linux-5.10.2/drivers/hwmon/Kconfig 2020-12-21 13:30:08.000000000 +0100
++++ linux-5.10.2-p/drivers/hwmon/Kconfig 2020-12-25 13:49:22.911559911 +0100
+@@ -1499,6 +1499,16 @@
+ This driver can also be built as a module. If so, the module
+ will be called sl28cpld-hwmon.
+
++config SENSORS_SBTSI
++ tristate "Emulated SB-TSI temperature sensor"
++ depends on I2C
++ help
++ If you say yes here you get support for emulated temperature
++ sensors on AMD SoCs with SB-TSI interface connected to a BMC device.
++
++ This driver can also be built as a module. If so, the module will
++ be called sbtsi_temp.
++
+ config SENSORS_SHT15
+ tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
+ depends on GPIOLIB || COMPILE_TEST
+diff -Naur linux-5.10.2/drivers/hwmon/Makefile linux-5.10.2-p/drivers/hwmon/Makefile
+--- linux-5.10.2/drivers/hwmon/Makefile 2020-12-21 13:30:08.000000000 +0100
++++ linux-5.10.2-p/drivers/hwmon/Makefile 2020-12-25 13:49:22.911559911 +0100
+@@ -158,6 +158,7 @@
+ obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
+ obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o
+ obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o
++obj-$(CONFIG_SENSORS_SBTSI) += sbtsi_temp.o
+ obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
+ obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o
+ obj-$(CONFIG_SENSORS_SCH5636) += sch5636.o
+diff -Naur linux-5.10.2/drivers/hwmon/sbtsi_temp.c linux-5.10.2-p/drivers/hwmon/sbtsi_temp.c
+--- linux-5.10.2/drivers/hwmon/sbtsi_temp.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-5.10.2-p/drivers/hwmon/sbtsi_temp.c 2020-12-25 13:49:22.911559911 +0100
+@@ -0,0 +1,250 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * sbtsi_temp.c - hwmon driver for a SBI Temperature Sensor Interface (SB-TSI)
++ * compliant AMD SoC temperature device.
++ *
++ * Copyright (c) 2020, Google Inc.
++ * Copyright (c) 2020, Kun Yi <kunyi@google.com>
++ */
++
++#include <linux/err.h>
++#include <linux/i2c.h>
++#include <linux/init.h>
++#include <linux/hwmon.h>
++#include <linux/module.h>
++#include <linux/mutex.h>
++#include <linux/of_device.h>
++#include <linux/of.h>
++
++/*
++ * SB-TSI registers only support SMBus byte data access. "_INT" registers are
++ * the integer part of a temperature value or limit, and "_DEC" registers are
++ * corresponding decimal parts.
++ */
++#define SBTSI_REG_TEMP_INT 0x01 /* RO */
++#define SBTSI_REG_STATUS 0x02 /* RO */
++#define SBTSI_REG_CONFIG 0x03 /* RO */
++#define SBTSI_REG_TEMP_HIGH_INT 0x07 /* RW */
++#define SBTSI_REG_TEMP_LOW_INT 0x08 /* RW */
++#define SBTSI_REG_TEMP_DEC 0x10 /* RW */
++#define SBTSI_REG_TEMP_HIGH_DEC 0x13 /* RW */
++#define SBTSI_REG_TEMP_LOW_DEC 0x14 /* RW */
++
++#define SBTSI_CONFIG_READ_ORDER_SHIFT 5
++
++#define SBTSI_TEMP_MIN 0
++#define SBTSI_TEMP_MAX 255875
++
++/* Each client has this additional data */
++struct sbtsi_data {
++ struct i2c_client *client;
++ struct mutex lock;
++};
++
++/*
++ * From SB-TSI spec: CPU temperature readings and limit registers encode the
++ * temperature in increments of 0.125 from 0 to 255.875. The "high byte"
++ * register encodes the base-2 of the integer portion, and the upper 3 bits of
++ * the "low byte" encode in base-2 the decimal portion.
++ *
++ * e.g. INT=0x19, DEC=0x20 represents 25.125 degrees Celsius
++ *
++ * Therefore temperature in millidegree Celsius =
++ * (INT + DEC / 256) * 1000 = (INT * 8 + DEC / 32) * 125
++ */
++static inline int sbtsi_reg_to_mc(s32 integer, s32 decimal)
++{
++ return ((integer << 3) + (decimal >> 5)) * 125;
++}
++
++/*
++ * Inversely, given temperature in millidegree Celsius
++ * INT = (TEMP / 125) / 8
++ * DEC = ((TEMP / 125) % 8) * 32
++ * Caller have to make sure temp doesn't exceed 255875, the max valid value.
++ */
++static inline void sbtsi_mc_to_reg(s32 temp, u8 *integer, u8 *decimal)
++{
++ temp /= 125;
++ *integer = temp >> 3;
++ *decimal = (temp & 0x7) << 5;
++}
++
++static int sbtsi_read(struct device *dev, enum hwmon_sensor_types type,
++ u32 attr, int channel, long *val)
++{
++ struct sbtsi_data *data = dev_get_drvdata(dev);
++ s32 temp_int, temp_dec;
++ int err;
++
++ switch (attr) {
++ case hwmon_temp_input:
++ /*
++ * ReadOrder bit specifies the reading order of integer and
++ * decimal part of CPU temp for atomic reads. If bit == 0,
++ * reading integer part triggers latching of the decimal part,
++ * so integer part should be read first. If bit == 1, read
++ * order should be reversed.
++ */
++ err = i2c_smbus_read_byte_data(data->client, SBTSI_REG_CONFIG);
++ if (err < 0)
++ return err;
++
++ mutex_lock(&data->lock);
++ if (err & BIT(SBTSI_CONFIG_READ_ORDER_SHIFT)) {
++ temp_dec = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_DEC);
++ temp_int = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_INT);
++ } else {
++ temp_int = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_INT);
++ temp_dec = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_DEC);
++ }
++ mutex_unlock(&data->lock);
++ break;
++ case hwmon_temp_max:
++ mutex_lock(&data->lock);
++ temp_int = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_HIGH_INT);
++ temp_dec = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_HIGH_DEC);
++ mutex_unlock(&data->lock);
++ break;
++ case hwmon_temp_min:
++ mutex_lock(&data->lock);
++ temp_int = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_LOW_INT);
++ temp_dec = i2c_smbus_read_byte_data(data->client, SBTSI_REG_TEMP_LOW_DEC);
++ mutex_unlock(&data->lock);
++ break;
++ default:
++ return -EINVAL;
++ }
++
++
++ if (temp_int < 0)
++ return temp_int;
++ if (temp_dec < 0)
++ return temp_dec;
++
++ *val = sbtsi_reg_to_mc(temp_int, temp_dec);
++
++ return 0;
++}
++
++static int sbtsi_write(struct device *dev, enum hwmon_sensor_types type,
++ u32 attr, int channel, long val)
++{
++ struct sbtsi_data *data = dev_get_drvdata(dev);
++ int reg_int, reg_dec, err;
++ u8 temp_int, temp_dec;
++
++ switch (attr) {
++ case hwmon_temp_max:
++ reg_int = SBTSI_REG_TEMP_HIGH_INT;
++ reg_dec = SBTSI_REG_TEMP_HIGH_DEC;
++ break;
++ case hwmon_temp_min:
++ reg_int = SBTSI_REG_TEMP_LOW_INT;
++ reg_dec = SBTSI_REG_TEMP_LOW_DEC;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ val = clamp_val(val, SBTSI_TEMP_MIN, SBTSI_TEMP_MAX);
++ sbtsi_mc_to_reg(val, &temp_int, &temp_dec);
++
++ mutex_lock(&data->lock);
++ err = i2c_smbus_write_byte_data(data->client, reg_int, temp_int);
++ if (err)
++ goto exit;
++
++ err = i2c_smbus_write_byte_data(data->client, reg_dec, temp_dec);
++exit:
++ mutex_unlock(&data->lock);
++ return err;
++}
++
++static umode_t sbtsi_is_visible(const void *data,
++ enum hwmon_sensor_types type,
++ u32 attr, int channel)
++{
++ switch (type) {
++ case hwmon_temp:
++ switch (attr) {
++ case hwmon_temp_input:
++ return 0444;
++ case hwmon_temp_min:
++ return 0644;
++ case hwmon_temp_max:
++ return 0644;
++ }
++ break;
++ default:
++ break;
++ }
++ return 0;
++}
++
++static const struct hwmon_channel_info *sbtsi_info[] = {
++ HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
++ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX),
++ NULL
++};
++
++static const struct hwmon_ops sbtsi_hwmon_ops = {
++ .is_visible = sbtsi_is_visible,
++ .read = sbtsi_read,
++ .write = sbtsi_write,
++};
++
++static const struct hwmon_chip_info sbtsi_chip_info = {
++ .ops = &sbtsi_hwmon_ops,
++ .info = sbtsi_info,
++};
++
++static int sbtsi_probe(struct i2c_client *client,
++ const struct i2c_device_id *id)
++{
++ struct device *dev = &client->dev;
++ struct device *hwmon_dev;
++ struct sbtsi_data *data;
++
++ data = devm_kzalloc(dev, sizeof(struct sbtsi_data), GFP_KERNEL);
++ if (!data)
++ return -ENOMEM;
++
++ data->client = client;
++ mutex_init(&data->lock);
++
++ hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, &sbtsi_chip_info,
++ NULL);
++
++ return PTR_ERR_OR_ZERO(hwmon_dev);
++}
++
++static const struct i2c_device_id sbtsi_id[] = {
++ {"sbtsi", 0},
++ {}
++};
++MODULE_DEVICE_TABLE(i2c, sbtsi_id);
++
++static const struct of_device_id __maybe_unused sbtsi_of_match[] = {
++ {
++ .compatible = "amd,sbtsi",
++ },
++ { },
++};
++MODULE_DEVICE_TABLE(of, sbtsi_of_match);
++
++static struct i2c_driver sbtsi_driver = {
++ .class = I2C_CLASS_HWMON,
++ .driver = {
++ .name = "sbtsi",
++ .of_match_table = of_match_ptr(sbtsi_of_match),
++ },
++ .probe = sbtsi_probe,
++ .id_table = sbtsi_id,
++};
++
++module_i2c_driver(sbtsi_driver);
++
++MODULE_AUTHOR("Kun Yi <kunyi@google.com>");
++MODULE_DESCRIPTION("Hwmon driver for AMD SB-TSI emulated sensor");
++MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-02 17:57:15 +0000