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487 lines
14 KiB
487 lines
14 KiB
// 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 <[email protected]> |
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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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char valid; /* zero 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 = 1; |
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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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/* |
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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); |
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if (verstep < 0 || (verstep & 0xF0) != 0xB0) |
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return -ENODEV; |
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if ((verstep & 0x0F) > 2) { |
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dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n", |
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verstep & 0x0F); |
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return -ENODEV; |
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} |
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|
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/* Check configuration */ |
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config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG); |
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if (config < 0 || (config & 0xF4) != 0x04) |
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return -ENODEV; |
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if (!(config & 0x01)) { |
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dev_err(&client->dev, "Monitoring not enabled\n"); |
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return -ENODEV; |
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} |
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strlcpy(info->type, "emc6w201", I2C_NAME_SIZE); |
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return 0; |
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} |
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static int emc6w201_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct emc6w201_data *data; |
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struct device *hwmon_dev; |
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data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->client = client; |
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mutex_init(&data->update_lock); |
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|
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
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data, |
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emc6w201_groups); |
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return PTR_ERR_OR_ZERO(hwmon_dev); |
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} |
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static const struct i2c_device_id emc6w201_id[] = { |
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{ "emc6w201", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, emc6w201_id); |
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static struct i2c_driver emc6w201_driver = { |
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.class = I2C_CLASS_HWMON, |
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.driver = { |
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.name = "emc6w201", |
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}, |
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.probe_new = emc6w201_probe, |
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.id_table = emc6w201_id, |
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.detect = emc6w201_detect, |
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.address_list = normal_i2c, |
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}; |
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module_i2c_driver(emc6w201_driver); |
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MODULE_AUTHOR("Jean Delvare <[email protected]>"); |
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MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver"); |
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MODULE_LICENSE("GPL");
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