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758b62e562
SG2042 use an external MCU to provide basic hardware information and thermal sensors. Add driver support for the onboard MCU of SG2042. Signed-off-by: Inochi Amaoto <inochiama@outlook.com> Message-ID: <IA1PR20MB49536C786048D1E676BB9C20BB822@IA1PR20MB4953.namprd20.prod.outlook.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
389 lines
8.8 KiB
C
389 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2024 Inochi Amaoto <inochiama@outlook.com>
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*
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* Sophgo power control mcu for SG2042
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*/
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#include <linux/cleanup.h>
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#include <linux/debugfs.h>
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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/* fixed MCU registers */
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#define REG_BOARD_TYPE 0x00
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#define REG_MCU_FIRMWARE_VERSION 0x01
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#define REG_PCB_VERSION 0x02
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#define REG_PWR_CTRL 0x03
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#define REG_SOC_TEMP 0x04
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#define REG_BOARD_TEMP 0x05
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#define REG_RST_COUNT 0x0a
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#define REG_UPTIME 0x0b
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#define REG_RESET_REASON 0x0d
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#define REG_MCU_TYPE 0x18
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#define REG_REPOWER_POLICY 0x65
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#define REG_CRITICAL_TEMP 0x66
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#define REG_REPOWER_TEMP 0x67
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#define REPOWER_POLICY_REBOOT 1
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#define REPOWER_POLICY_KEEP_OFF 2
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#define MCU_POWER_MAX 0xff
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#define DEFINE_MCU_DEBUG_ATTR(_name, _reg, _format) \
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static int _name##_show(struct seq_file *seqf, \
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void *unused) \
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{ \
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struct sg2042_mcu_data *mcu = seqf->private; \
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int ret; \
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ret = i2c_smbus_read_byte_data(mcu->client, (_reg)); \
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if (ret < 0) \
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return ret; \
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seq_printf(seqf, _format "\n", ret); \
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return 0; \
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} \
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DEFINE_SHOW_ATTRIBUTE(_name) \
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struct sg2042_mcu_data {
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struct i2c_client *client;
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struct dentry *debugfs;
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struct mutex mutex;
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};
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static struct dentry *sgmcu_debugfs;
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static ssize_t reset_count_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sg2042_mcu_data *mcu = dev_get_drvdata(dev);
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int ret;
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ret = i2c_smbus_read_byte_data(mcu->client, REG_RST_COUNT);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", ret);
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}
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static ssize_t uptime_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sg2042_mcu_data *mcu = dev_get_drvdata(dev);
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u8 time_val[2];
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int ret;
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ret = i2c_smbus_read_i2c_block_data(mcu->client, REG_UPTIME,
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sizeof(time_val), time_val);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n",
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(time_val[0]) | (time_val[1] << 8));
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}
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static ssize_t reset_reason_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sg2042_mcu_data *mcu = dev_get_drvdata(dev);
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int ret;
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ret = i2c_smbus_read_byte_data(mcu->client, REG_RESET_REASON);
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if (ret < 0)
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return ret;
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return sprintf(buf, "0x%02x\n", ret);
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}
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static ssize_t repower_policy_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct sg2042_mcu_data *mcu = dev_get_drvdata(dev);
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int ret;
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const char *action;
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ret = i2c_smbus_read_byte_data(mcu->client, REG_REPOWER_POLICY);
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if (ret < 0)
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return ret;
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if (ret == REPOWER_POLICY_REBOOT)
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action = "repower";
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else if (ret == REPOWER_POLICY_KEEP_OFF)
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action = "keep";
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else
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action = "unknown";
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return sprintf(buf, "%s\n", action);
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}
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static ssize_t repower_policy_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct sg2042_mcu_data *mcu = dev_get_drvdata(dev);
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u8 value;
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int ret;
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if (sysfs_streq("repower", buf))
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value = REPOWER_POLICY_REBOOT;
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else if (sysfs_streq("keep", buf))
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value = REPOWER_POLICY_KEEP_OFF;
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else
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return -EINVAL;
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ret = i2c_smbus_write_byte_data(mcu->client,
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REG_REPOWER_POLICY, value);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR_RO(reset_count);
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static DEVICE_ATTR_RO(uptime);
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static DEVICE_ATTR_RO(reset_reason);
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static DEVICE_ATTR_RW(repower_policy);
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DEFINE_MCU_DEBUG_ATTR(firmware_version, REG_MCU_FIRMWARE_VERSION, "0x%02x");
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DEFINE_MCU_DEBUG_ATTR(pcb_version, REG_PCB_VERSION, "0x%02x");
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DEFINE_MCU_DEBUG_ATTR(board_type, REG_BOARD_TYPE, "0x%02x");
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DEFINE_MCU_DEBUG_ATTR(mcu_type, REG_MCU_TYPE, "%d");
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static struct attribute *sg2042_mcu_attrs[] = {
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&dev_attr_reset_count.attr,
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&dev_attr_uptime.attr,
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&dev_attr_reset_reason.attr,
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&dev_attr_repower_policy.attr,
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NULL
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};
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static const struct attribute_group sg2042_mcu_attr_group = {
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.attrs = sg2042_mcu_attrs,
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};
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static const struct attribute_group *sg2042_mcu_groups[] = {
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&sg2042_mcu_attr_group,
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NULL
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};
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static const struct hwmon_channel_info * const sg2042_mcu_info[] = {
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HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
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HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_CRIT |
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HWMON_T_CRIT_HYST,
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HWMON_T_INPUT),
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NULL
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};
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static int sg2042_mcu_read(struct device *dev,
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enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct sg2042_mcu_data *mcu = dev_get_drvdata(dev);
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int tmp;
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u8 reg;
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switch (attr) {
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case hwmon_temp_input:
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reg = channel ? REG_BOARD_TEMP : REG_SOC_TEMP;
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break;
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case hwmon_temp_crit:
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reg = REG_CRITICAL_TEMP;
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break;
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case hwmon_temp_crit_hyst:
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reg = REG_REPOWER_TEMP;
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break;
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default:
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return -EOPNOTSUPP;
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}
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tmp = i2c_smbus_read_byte_data(mcu->client, reg);
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if (tmp < 0)
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return tmp;
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*val = tmp * 1000;
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return 0;
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}
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static int sg2042_mcu_write(struct device *dev,
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enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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struct sg2042_mcu_data *mcu = dev_get_drvdata(dev);
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int temp = val / 1000;
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int hyst_temp, crit_temp;
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u8 reg;
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temp = clamp_val(temp, 0, MCU_POWER_MAX);
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guard(mutex)(&mcu->mutex);
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switch (attr) {
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case hwmon_temp_crit:
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hyst_temp = i2c_smbus_read_byte_data(mcu->client,
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REG_REPOWER_TEMP);
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if (hyst_temp < 0)
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return hyst_temp;
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crit_temp = temp;
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reg = REG_CRITICAL_TEMP;
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break;
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case hwmon_temp_crit_hyst:
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crit_temp = i2c_smbus_read_byte_data(mcu->client,
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REG_CRITICAL_TEMP);
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if (crit_temp < 0)
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return crit_temp;
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hyst_temp = temp;
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reg = REG_REPOWER_TEMP;
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break;
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default:
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return -EOPNOTSUPP;
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}
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/*
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* ensure hyst_temp is smaller to avoid MCU from
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* keeping triggering repower event.
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*/
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if (crit_temp < hyst_temp)
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return -EINVAL;
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return i2c_smbus_write_byte_data(mcu->client, reg, temp);
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}
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static umode_t sg2042_mcu_is_visible(const void *_data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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switch (type) {
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_input:
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return 0444;
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case hwmon_temp_crit:
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case hwmon_temp_crit_hyst:
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if (channel == 0)
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return 0644;
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break;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static const struct hwmon_ops sg2042_mcu_ops = {
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.is_visible = sg2042_mcu_is_visible,
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.read = sg2042_mcu_read,
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.write = sg2042_mcu_write,
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};
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static const struct hwmon_chip_info sg2042_mcu_chip_info = {
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.ops = &sg2042_mcu_ops,
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.info = sg2042_mcu_info,
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};
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static void sg2042_mcu_debugfs_init(struct sg2042_mcu_data *mcu,
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struct device *dev)
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{
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mcu->debugfs = debugfs_create_dir(dev_name(dev), sgmcu_debugfs);
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debugfs_create_file("firmware_version", 0444, mcu->debugfs,
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mcu, &firmware_version_fops);
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debugfs_create_file("pcb_version", 0444, mcu->debugfs, mcu,
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&pcb_version_fops);
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debugfs_create_file("mcu_type", 0444, mcu->debugfs, mcu,
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&mcu_type_fops);
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debugfs_create_file("board_type", 0444, mcu->debugfs, mcu,
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&board_type_fops);
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}
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static int sg2042_mcu_i2c_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct sg2042_mcu_data *mcu;
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struct device *hwmon_dev;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA))
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return -ENODEV;
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mcu = devm_kmalloc(dev, sizeof(*mcu), GFP_KERNEL);
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if (!mcu)
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return -ENOMEM;
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mutex_init(&mcu->mutex);
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mcu->client = client;
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i2c_set_clientdata(client, mcu);
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hwmon_dev = devm_hwmon_device_register_with_info(dev, "sg2042_mcu",
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mcu,
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&sg2042_mcu_chip_info,
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NULL);
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if (IS_ERR(hwmon_dev))
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return PTR_ERR(hwmon_dev);
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sg2042_mcu_debugfs_init(mcu, dev);
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return 0;
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}
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static void sg2042_mcu_i2c_remove(struct i2c_client *client)
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{
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struct sg2042_mcu_data *mcu = i2c_get_clientdata(client);
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debugfs_remove_recursive(mcu->debugfs);
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}
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static const struct i2c_device_id sg2042_mcu_id[] = {
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{ "sg2042-hwmon-mcu", 0 },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, sg2042_mcu_id);
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static const struct of_device_id sg2042_mcu_of_id[] = {
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{ .compatible = "sophgo,sg2042-hwmon-mcu" },
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{},
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};
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MODULE_DEVICE_TABLE(of, sg2042_mcu_of_id);
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static struct i2c_driver sg2042_mcu_driver = {
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.driver = {
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.name = "sg2042-mcu",
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.of_match_table = sg2042_mcu_of_id,
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.dev_groups = sg2042_mcu_groups,
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},
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.probe = sg2042_mcu_i2c_probe,
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.remove = sg2042_mcu_i2c_remove,
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.id_table = sg2042_mcu_id,
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};
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static int __init sg2042_mcu_init(void)
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{
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sgmcu_debugfs = debugfs_create_dir("sg2042-mcu", NULL);
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return i2c_add_driver(&sg2042_mcu_driver);
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}
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static void __exit sg2042_mcu_exit(void)
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{
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debugfs_remove_recursive(sgmcu_debugfs);
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i2c_del_driver(&sg2042_mcu_driver);
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}
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module_init(sg2042_mcu_init);
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module_exit(sg2042_mcu_exit);
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MODULE_AUTHOR("Inochi Amaoto <inochiama@outlook.com>");
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MODULE_DESCRIPTION("MCU I2C driver for SG2042 soc platform");
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MODULE_LICENSE("GPL");
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