488 lines
14 KiB
C
488 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
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* Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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/*
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* Addresses to scan
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*/
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static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
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/*
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* The EMC6W201 registers
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*/
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#define EMC6W201_REG_IN(nr) (0x20 + (nr))
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#define EMC6W201_REG_TEMP(nr) (0x26 + (nr))
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#define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2)
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#define EMC6W201_REG_COMPANY 0x3E
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#define EMC6W201_REG_VERSTEP 0x3F
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#define EMC6W201_REG_CONFIG 0x40
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#define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2)
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#define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2)
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#define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2)
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#define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2)
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#define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2)
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enum subfeature { input, min, max };
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/*
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* Per-device data
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*/
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struct emc6w201_data {
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struct i2c_client *client;
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struct mutex update_lock;
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bool valid; /* false until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* registers values */
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u8 in[3][6];
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s8 temp[3][6];
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u16 fan[2][5];
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};
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/*
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* Combine LSB and MSB registers in a single value
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* Locking: must be called with data->update_lock held
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*/
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static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
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{
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int lsb, msb;
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lsb = i2c_smbus_read_byte_data(client, reg);
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msb = i2c_smbus_read_byte_data(client, reg + 1);
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if (unlikely(lsb < 0 || msb < 0)) {
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dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
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16, "read", reg);
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return 0xFFFF; /* Arbitrary value */
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}
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return (msb << 8) | lsb;
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}
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/*
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* Write 16-bit value to LSB and MSB registers
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* Locking: must be called with data->update_lock held
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*/
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static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
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{
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int err;
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err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
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if (likely(!err))
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err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
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if (unlikely(err < 0))
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dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
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16, "write", reg);
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return err;
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}
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/* Read 8-bit value from register */
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static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
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{
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int val;
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val = i2c_smbus_read_byte_data(client, reg);
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if (unlikely(val < 0)) {
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dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
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8, "read", reg);
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return 0x00; /* Arbitrary value */
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}
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return val;
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}
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/* Write 8-bit value to register */
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static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
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{
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int err;
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err = i2c_smbus_write_byte_data(client, reg, val);
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if (unlikely(err < 0))
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dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
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8, "write", reg);
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return err;
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}
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static struct emc6w201_data *emc6w201_update_device(struct device *dev)
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{
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struct emc6w201_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int nr;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
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for (nr = 0; nr < 6; nr++) {
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data->in[input][nr] =
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emc6w201_read8(client,
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EMC6W201_REG_IN(nr));
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data->in[min][nr] =
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emc6w201_read8(client,
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EMC6W201_REG_IN_LOW(nr));
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data->in[max][nr] =
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emc6w201_read8(client,
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EMC6W201_REG_IN_HIGH(nr));
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}
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for (nr = 0; nr < 6; nr++) {
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data->temp[input][nr] =
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emc6w201_read8(client,
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EMC6W201_REG_TEMP(nr));
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data->temp[min][nr] =
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emc6w201_read8(client,
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EMC6W201_REG_TEMP_LOW(nr));
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data->temp[max][nr] =
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emc6w201_read8(client,
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EMC6W201_REG_TEMP_HIGH(nr));
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}
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for (nr = 0; nr < 5; nr++) {
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data->fan[input][nr] =
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emc6w201_read16(client,
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EMC6W201_REG_FAN(nr));
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data->fan[min][nr] =
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emc6w201_read16(client,
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EMC6W201_REG_FAN_MIN(nr));
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}
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data->last_updated = jiffies;
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data->valid = true;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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/*
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* Sysfs callback functions
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*/
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static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
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static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct emc6w201_data *data = emc6w201_update_device(dev);
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int sf = to_sensor_dev_attr_2(devattr)->index;
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int nr = to_sensor_dev_attr_2(devattr)->nr;
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return sprintf(buf, "%u\n",
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(unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
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}
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static ssize_t in_store(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct emc6w201_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int sf = to_sensor_dev_attr_2(devattr)->index;
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int nr = to_sensor_dev_attr_2(devattr)->nr;
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int err;
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long val;
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u8 reg;
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err = kstrtol(buf, 10, &val);
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if (err < 0)
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return err;
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val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192);
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val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]);
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reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
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: EMC6W201_REG_IN_HIGH(nr);
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mutex_lock(&data->update_lock);
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data->in[sf][nr] = val;
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err = emc6w201_write8(client, reg, data->in[sf][nr]);
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mutex_unlock(&data->update_lock);
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return err < 0 ? err : count;
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}
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static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct emc6w201_data *data = emc6w201_update_device(dev);
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int sf = to_sensor_dev_attr_2(devattr)->index;
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int nr = to_sensor_dev_attr_2(devattr)->nr;
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return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
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}
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static ssize_t temp_store(struct device *dev,
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struct device_attribute *devattr, const char *buf,
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size_t count)
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{
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struct emc6w201_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int sf = to_sensor_dev_attr_2(devattr)->index;
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int nr = to_sensor_dev_attr_2(devattr)->nr;
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int err;
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long val;
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u8 reg;
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err = kstrtol(buf, 10, &val);
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if (err < 0)
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return err;
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val = clamp_val(val, -127000, 127000);
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val = DIV_ROUND_CLOSEST(val, 1000);
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reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
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: EMC6W201_REG_TEMP_HIGH(nr);
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mutex_lock(&data->update_lock);
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data->temp[sf][nr] = val;
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err = emc6w201_write8(client, reg, data->temp[sf][nr]);
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mutex_unlock(&data->update_lock);
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return err < 0 ? err : count;
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}
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static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct emc6w201_data *data = emc6w201_update_device(dev);
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int sf = to_sensor_dev_attr_2(devattr)->index;
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int nr = to_sensor_dev_attr_2(devattr)->nr;
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unsigned rpm;
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if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
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rpm = 0;
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else
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rpm = 5400000U / data->fan[sf][nr];
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return sprintf(buf, "%u\n", rpm);
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}
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static ssize_t fan_store(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct emc6w201_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int sf = to_sensor_dev_attr_2(devattr)->index;
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int nr = to_sensor_dev_attr_2(devattr)->nr;
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int err;
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unsigned long val;
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err = kstrtoul(buf, 10, &val);
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if (err < 0)
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return err;
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if (val == 0) {
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val = 0xFFFF;
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} else {
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val = DIV_ROUND_CLOSEST(5400000U, val);
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val = clamp_val(val, 0, 0xFFFE);
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}
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mutex_lock(&data->update_lock);
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data->fan[sf][nr] = val;
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err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
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data->fan[sf][nr]);
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mutex_unlock(&data->update_lock);
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return err < 0 ? err : count;
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}
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static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input);
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static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min);
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static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max);
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static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input);
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static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min);
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static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max);
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static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input);
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static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min);
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static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max);
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static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input);
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static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min);
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static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max);
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static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input);
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static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min);
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static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max);
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static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input);
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static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min);
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static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max);
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static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input);
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static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min);
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static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max);
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static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input);
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static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min);
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static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max);
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static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input);
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static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min);
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static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max);
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static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input);
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static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min);
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static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max);
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static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input);
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static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min);
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static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max);
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static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input);
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static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min);
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static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max);
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static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input);
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static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min);
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static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input);
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static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min);
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static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input);
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static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min);
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static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input);
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static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min);
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static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input);
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static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min);
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static struct attribute *emc6w201_attrs[] = {
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&sensor_dev_attr_in0_input.dev_attr.attr,
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&sensor_dev_attr_in0_min.dev_attr.attr,
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&sensor_dev_attr_in0_max.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in1_min.dev_attr.attr,
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&sensor_dev_attr_in1_max.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in2_min.dev_attr.attr,
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&sensor_dev_attr_in2_max.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in3_min.dev_attr.attr,
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&sensor_dev_attr_in3_max.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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&sensor_dev_attr_in4_min.dev_attr.attr,
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&sensor_dev_attr_in4_max.dev_attr.attr,
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&sensor_dev_attr_in5_input.dev_attr.attr,
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&sensor_dev_attr_in5_min.dev_attr.attr,
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&sensor_dev_attr_in5_max.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_min.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp3_input.dev_attr.attr,
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&sensor_dev_attr_temp3_min.dev_attr.attr,
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&sensor_dev_attr_temp3_max.dev_attr.attr,
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&sensor_dev_attr_temp4_input.dev_attr.attr,
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&sensor_dev_attr_temp4_min.dev_attr.attr,
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&sensor_dev_attr_temp4_max.dev_attr.attr,
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&sensor_dev_attr_temp5_input.dev_attr.attr,
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&sensor_dev_attr_temp5_min.dev_attr.attr,
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&sensor_dev_attr_temp5_max.dev_attr.attr,
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&sensor_dev_attr_temp6_input.dev_attr.attr,
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&sensor_dev_attr_temp6_min.dev_attr.attr,
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&sensor_dev_attr_temp6_max.dev_attr.attr,
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&sensor_dev_attr_fan1_input.dev_attr.attr,
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&sensor_dev_attr_fan1_min.dev_attr.attr,
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&sensor_dev_attr_fan2_input.dev_attr.attr,
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&sensor_dev_attr_fan2_min.dev_attr.attr,
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&sensor_dev_attr_fan3_input.dev_attr.attr,
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&sensor_dev_attr_fan3_min.dev_attr.attr,
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&sensor_dev_attr_fan4_input.dev_attr.attr,
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&sensor_dev_attr_fan4_min.dev_attr.attr,
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&sensor_dev_attr_fan5_input.dev_attr.attr,
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&sensor_dev_attr_fan5_min.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(emc6w201);
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/*
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* Driver interface
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*/
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int emc6w201_detect(struct i2c_client *client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = client->adapter;
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int company, verstep, config;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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/* Identification */
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company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
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if (company != 0x5C)
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return -ENODEV;
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verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
|
|
if (verstep < 0 || (verstep & 0xF0) != 0xB0)
|
|
return -ENODEV;
|
|
if ((verstep & 0x0F) > 2) {
|
|
dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n",
|
|
verstep & 0x0F);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Check configuration */
|
|
config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
|
|
if (config < 0 || (config & 0xF4) != 0x04)
|
|
return -ENODEV;
|
|
if (!(config & 0x01)) {
|
|
dev_err(&client->dev, "Monitoring not enabled\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
strscpy(info->type, "emc6w201", I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int emc6w201_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct emc6w201_data *data;
|
|
struct device *hwmon_dev;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
|
data,
|
|
emc6w201_groups);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
static const struct i2c_device_id emc6w201_id[] = {
|
|
{ "emc6w201", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, emc6w201_id);
|
|
|
|
static struct i2c_driver emc6w201_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "emc6w201",
|
|
},
|
|
.probe_new = emc6w201_probe,
|
|
.id_table = emc6w201_id,
|
|
.detect = emc6w201_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
module_i2c_driver(emc6w201_driver);
|
|
|
|
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
|
|
MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
|
|
MODULE_LICENSE("GPL");
|