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e1eb49063b
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
770 lines
21 KiB
C
770 lines
21 KiB
C
/*
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* Driver for Texas Instruments / National Semiconductor LM95234
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*
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* Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
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*
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* Derived from lm95241.c
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* Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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#include <linux/sysfs.h>
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#define DRVNAME "lm95234"
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static const unsigned short normal_i2c[] = { 0x18, 0x4d, 0x4e, I2C_CLIENT_END };
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/* LM95234 registers */
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#define LM95234_REG_MAN_ID 0xFE
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#define LM95234_REG_CHIP_ID 0xFF
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#define LM95234_REG_STATUS 0x02
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#define LM95234_REG_CONFIG 0x03
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#define LM95234_REG_CONVRATE 0x04
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#define LM95234_REG_STS_FAULT 0x07
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#define LM95234_REG_STS_TCRIT1 0x08
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#define LM95234_REG_STS_TCRIT2 0x09
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#define LM95234_REG_TEMPH(x) ((x) + 0x10)
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#define LM95234_REG_TEMPL(x) ((x) + 0x20)
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#define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */
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#define LM95234_REG_UTEMPL(x) ((x) + 0x29)
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#define LM95234_REG_REM_MODEL 0x30
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#define LM95234_REG_REM_MODEL_STS 0x38
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#define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */
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#define LM95234_REG_TCRIT1(x) ((x) + 0x40)
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#define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */
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#define LM95234_REG_TCRIT_HYST 0x5a
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#define NATSEMI_MAN_ID 0x01
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#define LM95234_CHIP_ID 0x79
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/* Client data (each client gets its own) */
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struct lm95234_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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unsigned long last_updated, interval; /* in jiffies */
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bool valid; /* false until following fields are valid */
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/* registers values */
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int temp[5]; /* temperature (signed) */
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u32 status; /* fault/alarm status */
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u8 tcrit1[5]; /* critical temperature limit */
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u8 tcrit2[2]; /* high temperature limit */
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s8 toffset[4]; /* remote temperature offset */
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u8 thyst; /* common hysteresis */
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u8 sensor_type; /* temperature sensor type */
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};
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static int lm95234_read_temp(struct i2c_client *client, int index, int *t)
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{
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int val;
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u16 temp = 0;
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if (index) {
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val = i2c_smbus_read_byte_data(client,
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LM95234_REG_UTEMPH(index - 1));
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if (val < 0)
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return val;
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temp = val << 8;
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val = i2c_smbus_read_byte_data(client,
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LM95234_REG_UTEMPL(index - 1));
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if (val < 0)
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return val;
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temp |= val;
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*t = temp;
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}
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/*
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* Read signed temperature if unsigned temperature is 0,
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* or if this is the local sensor.
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*/
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if (!temp) {
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val = i2c_smbus_read_byte_data(client,
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LM95234_REG_TEMPH(index));
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if (val < 0)
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return val;
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temp = val << 8;
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val = i2c_smbus_read_byte_data(client,
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LM95234_REG_TEMPL(index));
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if (val < 0)
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return val;
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temp |= val;
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*t = (s16)temp;
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}
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return 0;
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}
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static u16 update_intervals[] = { 143, 364, 1000, 2500 };
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/* Fill value cache. Must be called with update lock held. */
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static int lm95234_fill_cache(struct i2c_client *client)
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{
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struct lm95234_data *data = i2c_get_clientdata(client);
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int i, ret;
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
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if (ret < 0)
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return ret;
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data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]);
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for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) {
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i));
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if (ret < 0)
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return ret;
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data->tcrit1[i] = ret;
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}
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for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) {
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i));
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if (ret < 0)
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return ret;
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data->tcrit2[i] = ret;
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}
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for (i = 0; i < ARRAY_SIZE(data->toffset); i++) {
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i));
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if (ret < 0)
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return ret;
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data->toffset[i] = ret;
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}
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST);
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if (ret < 0)
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return ret;
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data->thyst = ret;
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
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if (ret < 0)
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return ret;
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data->sensor_type = ret;
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return 0;
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}
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static int lm95234_update_device(struct i2c_client *client,
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struct lm95234_data *data)
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{
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int ret;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + data->interval) ||
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!data->valid) {
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int i;
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if (!data->valid) {
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ret = lm95234_fill_cache(client);
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if (ret < 0)
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goto abort;
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}
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data->valid = false;
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for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
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ret = lm95234_read_temp(client, i, &data->temp[i]);
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if (ret < 0)
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goto abort;
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}
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT);
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if (ret < 0)
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goto abort;
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data->status = ret;
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1);
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if (ret < 0)
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goto abort;
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data->status |= ret << 8;
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ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2);
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if (ret < 0)
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goto abort;
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data->status |= ret << 16;
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data->last_updated = jiffies;
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data->valid = true;
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}
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ret = 0;
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n",
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DIV_ROUND_CLOSEST(data->temp[index] * 125, 32));
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}
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static ssize_t show_alarm(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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u32 mask = to_sensor_dev_attr(attr)->index;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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return sprintf(buf, "%u", !!(data->status & mask));
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}
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static ssize_t show_type(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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u8 mask = to_sensor_dev_attr(attr)->index;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n");
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}
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static ssize_t set_type(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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unsigned long val;
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u8 mask = to_sensor_dev_attr(attr)->index;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret < 0)
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return ret;
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if (val != 1 && val != 2)
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return -EINVAL;
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mutex_lock(&data->update_lock);
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if (val == 1)
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data->sensor_type |= mask;
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else
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data->sensor_type &= ~mask;
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data->valid = false;
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i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
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data->sensor_type);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_tcrit2(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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return sprintf(buf, "%u", data->tcrit2[index] * 1000);
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}
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static ssize_t set_tcrit2(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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long val;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127);
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mutex_lock(&data->update_lock);
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data->tcrit2[index] = val;
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i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT2(index), val);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_tcrit2_hyst(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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/* Result can be negative, so be careful with unsigned operands */
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return sprintf(buf, "%d",
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((int)data->tcrit2[index] - (int)data->thyst) * 1000);
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}
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static ssize_t show_tcrit1(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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return sprintf(buf, "%u", data->tcrit1[index] * 1000);
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}
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static ssize_t set_tcrit1(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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long val;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);
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mutex_lock(&data->update_lock);
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data->tcrit1[index] = val;
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i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT1(index), val);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_tcrit1_hyst(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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/* Result can be negative, so be careful with unsigned operands */
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return sprintf(buf, "%d",
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((int)data->tcrit1[index] - (int)data->thyst) * 1000);
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}
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static ssize_t set_tcrit1_hyst(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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long val;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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val = DIV_ROUND_CLOSEST(val, 1000);
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val = clamp_val((int)data->tcrit1[index] - val, 0, 31);
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mutex_lock(&data->update_lock);
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data->thyst = val;
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i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT_HYST, val);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_offset(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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return sprintf(buf, "%d", data->toffset[index] * 500);
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}
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static ssize_t set_offset(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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long val;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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ret = kstrtol(buf, 10, &val);
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if (ret < 0)
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return ret;
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/* Accuracy is 1/2 degrees C */
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val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127);
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mutex_lock(&data->update_lock);
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data->toffset[index] = val;
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i2c_smbus_write_byte_data(client, LM95234_REG_OFFSET(index), val);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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return sprintf(buf, "%lu\n",
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DIV_ROUND_CLOSEST(data->interval * 1000, HZ));
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}
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static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95234_data *data = i2c_get_clientdata(client);
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unsigned long val;
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u8 regval;
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int ret = lm95234_update_device(client, data);
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if (ret)
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return ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret < 0)
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return ret;
|
|
|
|
for (regval = 0; regval < 3; regval++) {
|
|
if (val <= update_intervals[regval])
|
|
break;
|
|
}
|
|
|
|
mutex_lock(&data->update_lock);
|
|
data->interval = msecs_to_jiffies(update_intervals[regval]);
|
|
i2c_smbus_write_byte_data(client, LM95234_REG_CONVRATE, regval);
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
|
|
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
|
|
static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
|
|
BIT(0) | BIT(1));
|
|
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL,
|
|
BIT(2) | BIT(3));
|
|
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL,
|
|
BIT(4) | BIT(5));
|
|
static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL,
|
|
BIT(6) | BIT(7));
|
|
|
|
static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
|
|
BIT(1));
|
|
static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
|
|
BIT(2));
|
|
static SENSOR_DEVICE_ATTR(temp4_type, S_IWUSR | S_IRUGO, show_type, set_type,
|
|
BIT(3));
|
|
static SENSOR_DEVICE_ATTR(temp5_type, S_IWUSR | S_IRUGO, show_type, set_type,
|
|
BIT(4));
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_tcrit1,
|
|
set_tcrit1, 0);
|
|
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_tcrit2,
|
|
set_tcrit2, 0);
|
|
static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_tcrit2,
|
|
set_tcrit2, 1);
|
|
static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_tcrit1,
|
|
set_tcrit1, 3);
|
|
static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_tcrit1,
|
|
set_tcrit1, 4);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_tcrit1_hyst,
|
|
set_tcrit1_hyst, 0);
|
|
static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 3);
|
|
static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 4);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
|
|
BIT(0 + 8));
|
|
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
|
|
BIT(1 + 16));
|
|
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
|
|
BIT(2 + 16));
|
|
static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
|
|
BIT(3 + 8));
|
|
static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
|
|
BIT(4 + 8));
|
|
|
|
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_tcrit1,
|
|
set_tcrit1, 1);
|
|
static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_tcrit1,
|
|
set_tcrit1, 2);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 2);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
|
|
BIT(1 + 8));
|
|
static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
|
|
BIT(2 + 8));
|
|
|
|
static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_offset,
|
|
set_offset, 0);
|
|
static SENSOR_DEVICE_ATTR(temp3_offset, S_IWUSR | S_IRUGO, show_offset,
|
|
set_offset, 1);
|
|
static SENSOR_DEVICE_ATTR(temp4_offset, S_IWUSR | S_IRUGO, show_offset,
|
|
set_offset, 2);
|
|
static SENSOR_DEVICE_ATTR(temp5_offset, S_IWUSR | S_IRUGO, show_offset,
|
|
set_offset, 3);
|
|
|
|
static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
|
|
set_interval);
|
|
|
|
static struct attribute *lm95234_attributes[] = {
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp5_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_fault.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_fault.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_fault.dev_attr.attr,
|
|
&sensor_dev_attr_temp5_fault.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_type.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_type.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_type.dev_attr.attr,
|
|
&sensor_dev_attr_temp5_type.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp5_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_offset.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_offset.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_offset.dev_attr.attr,
|
|
&sensor_dev_attr_temp5_offset.dev_attr.attr,
|
|
&dev_attr_update_interval.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group lm95234_group = {
|
|
.attrs = lm95234_attributes,
|
|
};
|
|
|
|
static int lm95234_detect(struct i2c_client *client,
|
|
struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
int mfg_id, chip_id, val;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
|
|
if (mfg_id != NATSEMI_MAN_ID)
|
|
return -ENODEV;
|
|
|
|
chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
|
|
if (chip_id != LM95234_CHIP_ID)
|
|
return -ENODEV;
|
|
|
|
val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
|
|
if (val & 0x30)
|
|
return -ENODEV;
|
|
|
|
val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
|
|
if (val & 0xbc)
|
|
return -ENODEV;
|
|
|
|
val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
|
|
if (val & 0xfc)
|
|
return -ENODEV;
|
|
|
|
val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
|
|
if (val & 0xe1)
|
|
return -ENODEV;
|
|
|
|
val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
|
|
if (val & 0xe1)
|
|
return -ENODEV;
|
|
|
|
strlcpy(info->type, "lm95234", I2C_NAME_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
static int lm95234_init_client(struct i2c_client *client)
|
|
{
|
|
int val, model;
|
|
|
|
/* start conversion if necessary */
|
|
val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
|
|
if (val < 0)
|
|
return val;
|
|
if (val & 0x40)
|
|
i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG,
|
|
val & ~0x40);
|
|
|
|
/* If diode type status reports an error, try to fix it */
|
|
val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
|
|
if (val < 0)
|
|
return val;
|
|
model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
|
|
if (model < 0)
|
|
return model;
|
|
if (model & val) {
|
|
dev_notice(&client->dev,
|
|
"Fixing remote diode type misconfiguration (0x%x)\n",
|
|
val);
|
|
i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
|
|
model & ~val);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int lm95234_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct lm95234_data *data;
|
|
int err;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Initialize the LM95234 chip */
|
|
err = lm95234_init_client(client);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* Register sysfs hooks */
|
|
err = sysfs_create_group(&dev->kobj, &lm95234_group);
|
|
if (err)
|
|
return err;
|
|
|
|
data->hwmon_dev = hwmon_device_register(dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
goto exit_remove_files;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_remove_files:
|
|
sysfs_remove_group(&dev->kobj, &lm95234_group);
|
|
return err;
|
|
}
|
|
|
|
static int lm95234_remove(struct i2c_client *client)
|
|
{
|
|
struct lm95234_data *data = i2c_get_clientdata(client);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &lm95234_group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Driver data (common to all clients) */
|
|
static const struct i2c_device_id lm95234_id[] = {
|
|
{ "lm95234", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm95234_id);
|
|
|
|
static struct i2c_driver lm95234_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = DRVNAME,
|
|
},
|
|
.probe = lm95234_probe,
|
|
.remove = lm95234_remove,
|
|
.id_table = lm95234_id,
|
|
.detect = lm95234_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
module_i2c_driver(lm95234_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
|
|
MODULE_DESCRIPTION("LM95234 sensor driver");
|
|
MODULE_LICENSE("GPL");
|