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-rw-r--r--drivers/hwmon/sch5627.c554
1 files changed, 554 insertions, 0 deletions
diff --git a/drivers/hwmon/sch5627.c b/drivers/hwmon/sch5627.c
new file mode 100644
index 0000000000..bf408e35e2
--- /dev/null
+++ b/drivers/hwmon/sch5627.c
@@ -0,0 +1,554 @@
+// 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/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 * 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 & 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 <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 07:59:48 +0000