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- // SPDX-License-Identifier: GPL-2.0-or-later
- /***************************************************************************
- * Copyright (C) 2010-2012 Hans de Goede <[email protected]> *
- * *
- ***************************************************************************/
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/bits.h>
- #include <linux/module.h>
- #include <linux/mod_devicetable.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/jiffies.h>
- #include <linux/platform_device.h>
- #include <linux/hwmon.h>
- #include <linux/err.h>
- #include <linux/mutex.h>
- #include "sch56xx-common.h"
- #define DRVNAME "sch5627"
- #define DEVNAME DRVNAME /* We only support one model */
- #define SCH5627_HWMON_ID 0xa5
- #define SCH5627_COMPANY_ID 0x5c
- #define SCH5627_PRIMARY_ID 0xa0
- #define SCH5627_REG_BUILD_CODE 0x39
- #define SCH5627_REG_BUILD_ID 0x3a
- #define SCH5627_REG_HWMON_ID 0x3c
- #define SCH5627_REG_HWMON_REV 0x3d
- #define SCH5627_REG_COMPANY_ID 0x3e
- #define SCH5627_REG_PRIMARY_ID 0x3f
- #define SCH5627_REG_CTRL 0x40
- #define SCH5627_CTRL_START BIT(0)
- #define SCH5627_CTRL_LOCK BIT(1)
- #define SCH5627_CTRL_VBAT BIT(4)
- #define SCH5627_NO_TEMPS 8
- #define SCH5627_NO_FANS 4
- #define SCH5627_NO_IN 5
- static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
- 0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
- static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
- 0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
- static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
- 0, 0, 1, 1, 0, 0, 0, 1 };
- static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
- 0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
- static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
- 0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
- static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
- 0x2C, 0x2E, 0x30, 0x32 };
- static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
- 0x62, 0x64, 0x66, 0x68 };
- static const u16 SCH5627_REG_PWM_MAP[SCH5627_NO_FANS] = {
- 0xA0, 0xA1, 0xA2, 0xA3 };
- static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
- 0x22, 0x23, 0x24, 0x25, 0x189 };
- static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
- 0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
- static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
- 1, 0, 1, 0, 1 };
- static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
- 10745, 3660, 9765, 10745, 3660 };
- static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
- "VCC", "VTT", "VBAT", "VTR", "V_IN" };
- struct sch5627_data {
- unsigned short addr;
- u8 control;
- u8 temp_max[SCH5627_NO_TEMPS];
- u8 temp_crit[SCH5627_NO_TEMPS];
- u16 fan_min[SCH5627_NO_FANS];
- struct mutex update_lock;
- unsigned long last_battery; /* In jiffies */
- char temp_valid; /* !=0 if following fields are valid */
- char fan_valid;
- char in_valid;
- unsigned long temp_last_updated; /* In jiffies */
- unsigned long fan_last_updated;
- unsigned long in_last_updated;
- u16 temp[SCH5627_NO_TEMPS];
- u16 fan[SCH5627_NO_FANS];
- u16 in[SCH5627_NO_IN];
- };
- static int sch5627_update_temp(struct sch5627_data *data)
- {
- int ret = 0;
- int i, val;
- mutex_lock(&data->update_lock);
- /* Cache the values for 1 second */
- if (time_after(jiffies, data->temp_last_updated + HZ) || !data->temp_valid) {
- for (i = 0; i < SCH5627_NO_TEMPS; i++) {
- val = sch56xx_read_virtual_reg12(data->addr, SCH5627_REG_TEMP_MSB[i],
- SCH5627_REG_TEMP_LSN[i],
- SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
- if (unlikely(val < 0)) {
- ret = val;
- goto abort;
- }
- data->temp[i] = val;
- }
- data->temp_last_updated = jiffies;
- data->temp_valid = 1;
- }
- abort:
- mutex_unlock(&data->update_lock);
- return ret;
- }
- static int sch5627_update_fan(struct sch5627_data *data)
- {
- int ret = 0;
- int i, val;
- mutex_lock(&data->update_lock);
- /* Cache the values for 1 second */
- if (time_after(jiffies, data->fan_last_updated + HZ) || !data->fan_valid) {
- for (i = 0; i < SCH5627_NO_FANS; i++) {
- val = sch56xx_read_virtual_reg16(data->addr, SCH5627_REG_FAN[i]);
- if (unlikely(val < 0)) {
- ret = val;
- goto abort;
- }
- data->fan[i] = val;
- }
- data->fan_last_updated = jiffies;
- data->fan_valid = 1;
- }
- abort:
- mutex_unlock(&data->update_lock);
- return ret;
- }
- static int sch5627_update_in(struct sch5627_data *data)
- {
- int ret = 0;
- int i, val;
- mutex_lock(&data->update_lock);
- /* Trigger a Vbat voltage measurement every 5 minutes */
- if (time_after(jiffies, data->last_battery + 300 * HZ)) {
- sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
- data->control | SCH5627_CTRL_VBAT);
- data->last_battery = jiffies;
- }
- /* Cache the values for 1 second */
- if (time_after(jiffies, data->in_last_updated + HZ) || !data->in_valid) {
- for (i = 0; i < SCH5627_NO_IN; i++) {
- val = sch56xx_read_virtual_reg12(data->addr, SCH5627_REG_IN_MSB[i],
- SCH5627_REG_IN_LSN[i],
- SCH5627_REG_IN_HIGH_NIBBLE[i]);
- if (unlikely(val < 0)) {
- ret = val;
- goto abort;
- }
- data->in[i] = val;
- }
- data->in_last_updated = jiffies;
- data->in_valid = 1;
- }
- abort:
- mutex_unlock(&data->update_lock);
- return ret;
- }
- static int sch5627_read_limits(struct sch5627_data *data)
- {
- int i, val;
- for (i = 0; i < SCH5627_NO_TEMPS; i++) {
- /*
- * Note what SMSC calls ABS, is what lm_sensors calls max
- * (aka high), and HIGH is what lm_sensors calls crit.
- */
- val = sch56xx_read_virtual_reg(data->addr,
- SCH5627_REG_TEMP_ABS[i]);
- if (val < 0)
- return val;
- data->temp_max[i] = val;
- val = sch56xx_read_virtual_reg(data->addr,
- SCH5627_REG_TEMP_HIGH[i]);
- if (val < 0)
- return val;
- data->temp_crit[i] = val;
- }
- for (i = 0; i < SCH5627_NO_FANS; i++) {
- val = sch56xx_read_virtual_reg16(data->addr,
- SCH5627_REG_FAN_MIN[i]);
- if (val < 0)
- return val;
- data->fan_min[i] = val;
- }
- return 0;
- }
- static int reg_to_temp(u16 reg)
- {
- return (reg * 625) / 10 - 64000;
- }
- static int reg_to_temp_limit(u8 reg)
- {
- return (reg - 64) * 1000;
- }
- static int reg_to_rpm(u16 reg)
- {
- if (reg == 0)
- return -EIO;
- if (reg == 0xffff)
- return 0;
- return 5400540 / reg;
- }
- static umode_t sch5627_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr,
- int channel)
- {
- const struct sch5627_data *data = drvdata;
- /* Once the lock bit is set, the virtual registers become read-only
- * until the next power cycle.
- */
- if (data->control & SCH5627_CTRL_LOCK)
- return 0444;
- if (type == hwmon_pwm && attr == hwmon_pwm_auto_channels_temp)
- return 0644;
- return 0444;
- }
- static int sch5627_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
- long *val)
- {
- struct sch5627_data *data = dev_get_drvdata(dev);
- int ret;
- switch (type) {
- case hwmon_temp:
- ret = sch5627_update_temp(data);
- if (ret < 0)
- return ret;
- switch (attr) {
- case hwmon_temp_input:
- *val = reg_to_temp(data->temp[channel]);
- return 0;
- case hwmon_temp_max:
- *val = reg_to_temp_limit(data->temp_max[channel]);
- return 0;
- case hwmon_temp_crit:
- *val = reg_to_temp_limit(data->temp_crit[channel]);
- return 0;
- case hwmon_temp_fault:
- *val = (data->temp[channel] == 0);
- return 0;
- default:
- break;
- }
- break;
- case hwmon_fan:
- ret = sch5627_update_fan(data);
- if (ret < 0)
- return ret;
- switch (attr) {
- case hwmon_fan_input:
- ret = reg_to_rpm(data->fan[channel]);
- if (ret < 0)
- return ret;
- *val = ret;
- return 0;
- case hwmon_fan_min:
- ret = reg_to_rpm(data->fan_min[channel]);
- if (ret < 0)
- return ret;
- *val = ret;
- return 0;
- case hwmon_fan_fault:
- *val = (data->fan[channel] == 0xffff);
- return 0;
- default:
- break;
- }
- break;
- case hwmon_pwm:
- switch (attr) {
- case hwmon_pwm_auto_channels_temp:
- mutex_lock(&data->update_lock);
- ret = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PWM_MAP[channel]);
- mutex_unlock(&data->update_lock);
- if (ret < 0)
- return ret;
- *val = ret;
- return 0;
- default:
- break;
- }
- break;
- case hwmon_in:
- ret = sch5627_update_in(data);
- if (ret < 0)
- return ret;
- switch (attr) {
- case hwmon_in_input:
- *val = DIV_ROUND_CLOSEST(data->in[channel] * SCH5627_REG_IN_FACTOR[channel],
- 10000);
- return 0;
- default:
- break;
- }
- break;
- default:
- break;
- }
- return -EOPNOTSUPP;
- }
- static int sch5627_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
- int channel, const char **str)
- {
- switch (type) {
- case hwmon_in:
- switch (attr) {
- case hwmon_in_label:
- *str = SCH5627_IN_LABELS[channel];
- return 0;
- default:
- break;
- }
- break;
- default:
- break;
- }
- return -EOPNOTSUPP;
- }
- static int sch5627_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
- long val)
- {
- struct sch5627_data *data = dev_get_drvdata(dev);
- int ret;
- switch (type) {
- case hwmon_pwm:
- switch (attr) {
- case hwmon_pwm_auto_channels_temp:
- /* registers are 8 bit wide */
- if (val > U8_MAX || val < 0)
- return -EINVAL;
- mutex_lock(&data->update_lock);
- ret = sch56xx_write_virtual_reg(data->addr, SCH5627_REG_PWM_MAP[channel],
- val);
- mutex_unlock(&data->update_lock);
- return ret;
- default:
- break;
- }
- break;
- default:
- break;
- }
- return -EOPNOTSUPP;
- }
- static const struct hwmon_ops sch5627_ops = {
- .is_visible = sch5627_is_visible,
- .read = sch5627_read,
- .read_string = sch5627_read_string,
- .write = sch5627_write,
- };
- static const struct hwmon_channel_info *sch5627_info[] = {
- HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
- HWMON_CHANNEL_INFO(temp,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT
- ),
- HWMON_CHANNEL_INFO(fan,
- HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_FAULT
- ),
- HWMON_CHANNEL_INFO(pwm,
- HWMON_PWM_AUTO_CHANNELS_TEMP,
- HWMON_PWM_AUTO_CHANNELS_TEMP,
- HWMON_PWM_AUTO_CHANNELS_TEMP,
- HWMON_PWM_AUTO_CHANNELS_TEMP
- ),
- HWMON_CHANNEL_INFO(in,
- HWMON_I_INPUT | HWMON_I_LABEL,
- HWMON_I_INPUT | HWMON_I_LABEL,
- HWMON_I_INPUT | HWMON_I_LABEL,
- HWMON_I_INPUT | HWMON_I_LABEL,
- HWMON_I_INPUT
- ),
- NULL
- };
- static const struct hwmon_chip_info sch5627_chip_info = {
- .ops = &sch5627_ops,
- .info = sch5627_info,
- };
- static int sch5627_probe(struct platform_device *pdev)
- {
- struct sch5627_data *data;
- struct device *hwmon_dev;
- int err, build_code, build_id, hwmon_rev, val;
- data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_data),
- GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
- mutex_init(&data->update_lock);
- platform_set_drvdata(pdev, data);
- val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);
- if (val < 0)
- return val;
- if (val != SCH5627_HWMON_ID) {
- pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "hwmon",
- val, SCH5627_HWMON_ID);
- return -ENODEV;
- }
- val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);
- if (val < 0)
- return val;
- if (val != SCH5627_COMPANY_ID) {
- pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "company",
- val, SCH5627_COMPANY_ID);
- return -ENODEV;
- }
- val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);
- if (val < 0)
- return val;
- if (val != SCH5627_PRIMARY_ID) {
- pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "primary",
- val, SCH5627_PRIMARY_ID);
- return -ENODEV;
- }
- build_code = sch56xx_read_virtual_reg(data->addr,
- SCH5627_REG_BUILD_CODE);
- if (build_code < 0)
- return build_code;
- build_id = sch56xx_read_virtual_reg16(data->addr,
- SCH5627_REG_BUILD_ID);
- if (build_id < 0)
- return build_id;
- hwmon_rev = sch56xx_read_virtual_reg(data->addr,
- SCH5627_REG_HWMON_REV);
- if (hwmon_rev < 0)
- return hwmon_rev;
- val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);
- if (val < 0)
- return val;
- data->control = val;
- if (!(data->control & SCH5627_CTRL_START)) {
- pr_err("hardware monitoring not enabled\n");
- return -ENODEV;
- }
- /* Trigger a Vbat voltage measurement, so that we get a valid reading
- the first time we read Vbat */
- sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL, data->control | SCH5627_CTRL_VBAT);
- data->last_battery = jiffies;
- /*
- * Read limits, we do this only once as reading a register on
- * the sch5627 is quite expensive (and they don't change).
- */
- err = sch5627_read_limits(data);
- if (err)
- return err;
- pr_info("found %s chip at %#hx\n", DEVNAME, data->addr);
- pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n",
- build_code, build_id, hwmon_rev);
- hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, DEVNAME, data,
- &sch5627_chip_info, NULL);
- if (IS_ERR(hwmon_dev))
- return PTR_ERR(hwmon_dev);
- /* Note failing to register the watchdog is not a fatal error */
- sch56xx_watchdog_register(&pdev->dev, data->addr,
- (build_code << 24) | (build_id << 8) | hwmon_rev,
- &data->update_lock, 1);
- return 0;
- }
- static const struct platform_device_id sch5627_device_id[] = {
- {
- .name = "sch5627",
- },
- { }
- };
- MODULE_DEVICE_TABLE(platform, sch5627_device_id);
- static struct platform_driver sch5627_driver = {
- .driver = {
- .name = DRVNAME,
- },
- .probe = sch5627_probe,
- .id_table = sch5627_device_id,
- };
- module_platform_driver(sch5627_driver);
- MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
- MODULE_AUTHOR("Hans de Goede <[email protected]>");
- MODULE_LICENSE("GPL");
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