drivers/hwmon/sch5627.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /***************************************************************************
  *   Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com>           *
  *                                                                         *
  ***************************************************************************/

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #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_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 | 0x10);
 		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)
 {
 	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 * const 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 & 0x01)) {
 		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 | 0x10);
 	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 <hdegoede@redhat.com>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/***************************************************************************
	* Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com> *
	* *
	***************************************************************************/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#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_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 \| 0x10);
	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)
	{
	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 * const 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 & 0x01)) {
	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 \| 0x10);
	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 <hdegoede@redhat.com>");
	MODULE_LICENSE("GPL");