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0501a3816e
hwmon: Fix unchecked return status, batch 2 Fix up some hwmon drivers so that they no longer ignore return status from device_create_file(). Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
452 lines
14 KiB
C
452 lines
14 KiB
C
/*
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* lm92 - Hardware monitoring driver
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* Copyright (C) 2005 Jean Delvare <khali@linux-fr.org>
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*
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* Based on the lm90 driver, with some ideas taken from the lm_sensors
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* lm92 driver as well.
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*
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* The LM92 is a sensor chip made by National Semiconductor. It reports
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* its own temperature with a 0.0625 deg resolution and a 0.33 deg
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* accuracy. Complete datasheet can be obtained from National's website
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* at:
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* http://www.national.com/pf/LM/LM92.html
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*
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* This driver also supports the MAX6635 sensor chip made by Maxim.
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* This chip is compatible with the LM92, but has a lesser accuracy
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* (1.0 deg). Complete datasheet can be obtained from Maxim's website
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* at:
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* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
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*
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* Since the LM92 was the first chipset supported by this driver, most
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* comments will refer to this chipset, but are actually general and
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* concern all supported chipsets, unless mentioned otherwise.
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*
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* Support could easily be added for the National Semiconductor LM76
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* and Maxim MAX6633 and MAX6634 chips, which are mostly compatible
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* with the LM92.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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/* The LM92 and MAX6635 have 2 two-state pins for address selection,
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resulting in 4 possible addresses. */
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static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
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I2C_CLIENT_END };
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/* Insmod parameters */
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I2C_CLIENT_INSMOD_1(lm92);
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/* The LM92 registers */
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#define LM92_REG_CONFIG 0x01 /* 8-bit, RW */
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#define LM92_REG_TEMP 0x00 /* 16-bit, RO */
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#define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */
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#define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */
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#define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */
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#define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */
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#define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */
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/* The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius,
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left-justified in 16-bit registers. No rounding is done, with such
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a resolution it's just not worth it. Note that the MAX6635 doesn't
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make use of the 4 lower bits for limits (i.e. effective resolution
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for limits is 1 degree Celsius). */
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static inline int TEMP_FROM_REG(s16 reg)
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{
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return reg / 8 * 625 / 10;
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}
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static inline s16 TEMP_TO_REG(int val)
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{
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if (val <= -60000)
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return -60000 * 10 / 625 * 8;
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if (val >= 160000)
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return 160000 * 10 / 625 * 8;
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return val * 10 / 625 * 8;
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}
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/* Alarm flags are stored in the 3 LSB of the temperature register */
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static inline u8 ALARMS_FROM_REG(s16 reg)
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{
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return reg & 0x0007;
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}
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/* Driver data (common to all clients) */
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static struct i2c_driver lm92_driver;
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/* Client data (each client gets its own) */
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struct lm92_data {
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struct i2c_client client;
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struct class_device *class_dev;
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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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s16 temp1_input, temp1_crit, temp1_min, temp1_max, temp1_hyst;
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};
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/*
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* Sysfs attributes and callback functions
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*/
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static struct lm92_data *lm92_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm92_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ)
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|| !data->valid) {
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dev_dbg(&client->dev, "Updating lm92 data\n");
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data->temp1_input = swab16(i2c_smbus_read_word_data(client,
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LM92_REG_TEMP));
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data->temp1_hyst = swab16(i2c_smbus_read_word_data(client,
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LM92_REG_TEMP_HYST));
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data->temp1_crit = swab16(i2c_smbus_read_word_data(client,
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LM92_REG_TEMP_CRIT));
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data->temp1_min = swab16(i2c_smbus_read_word_data(client,
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LM92_REG_TEMP_LOW));
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data->temp1_max = swab16(i2c_smbus_read_word_data(client,
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LM92_REG_TEMP_HIGH));
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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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#define show_temp(value) \
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static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct lm92_data *data = lm92_update_device(dev); \
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
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}
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show_temp(temp1_input);
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show_temp(temp1_crit);
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show_temp(temp1_min);
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show_temp(temp1_max);
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#define set_temp(value, reg) \
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static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \
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size_t count) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct lm92_data *data = i2c_get_clientdata(client); \
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long val = simple_strtol(buf, NULL, 10); \
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\
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mutex_lock(&data->update_lock); \
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data->value = TEMP_TO_REG(val); \
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i2c_smbus_write_word_data(client, reg, swab16(data->value)); \
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mutex_unlock(&data->update_lock); \
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return count; \
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}
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set_temp(temp1_crit, LM92_REG_TEMP_CRIT);
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set_temp(temp1_min, LM92_REG_TEMP_LOW);
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set_temp(temp1_max, LM92_REG_TEMP_HIGH);
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static ssize_t show_temp1_crit_hyst(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct lm92_data *data = lm92_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_crit)
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- TEMP_FROM_REG(data->temp1_hyst));
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}
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static ssize_t show_temp1_max_hyst(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct lm92_data *data = lm92_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_max)
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- TEMP_FROM_REG(data->temp1_hyst));
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}
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static ssize_t show_temp1_min_hyst(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct lm92_data *data = lm92_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_min)
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+ TEMP_FROM_REG(data->temp1_hyst));
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}
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static ssize_t set_temp1_crit_hyst(struct device *dev, struct device_attribute *attr, const char *buf,
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size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm92_data *data = i2c_get_clientdata(client);
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long val = simple_strtol(buf, NULL, 10);
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mutex_lock(&data->update_lock);
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data->temp1_hyst = TEMP_FROM_REG(data->temp1_crit) - val;
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i2c_smbus_write_word_data(client, LM92_REG_TEMP_HYST,
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swab16(TEMP_TO_REG(data->temp1_hyst)));
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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_alarms(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct lm92_data *data = lm92_update_device(dev);
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return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->temp1_input));
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}
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static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp1_input, NULL);
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static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp1_crit,
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set_temp1_crit);
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static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp1_crit_hyst,
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set_temp1_crit_hyst);
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static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp1_min,
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set_temp1_min);
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static DEVICE_ATTR(temp1_min_hyst, S_IRUGO, show_temp1_min_hyst, NULL);
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static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp1_max,
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set_temp1_max);
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static DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_temp1_max_hyst, NULL);
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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/*
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* Detection and registration
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*/
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static void lm92_init_client(struct i2c_client *client)
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{
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u8 config;
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/* Start the conversions if needed */
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config = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG);
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if (config & 0x01)
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i2c_smbus_write_byte_data(client, LM92_REG_CONFIG,
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config & 0xFE);
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}
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/* The MAX6635 has no identification register, so we have to use tricks
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to identify it reliably. This is somewhat slow.
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Note that we do NOT rely on the 2 MSB of the configuration register
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always reading 0, as suggested by the datasheet, because it was once
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reported not to be true. */
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static int max6635_check(struct i2c_client *client)
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{
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u16 temp_low, temp_high, temp_hyst, temp_crit;
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u8 conf;
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int i;
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/* No manufacturer ID register, so a read from this address will
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always return the last read value. */
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temp_low = i2c_smbus_read_word_data(client, LM92_REG_TEMP_LOW);
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if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_low)
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return 0;
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temp_high = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HIGH);
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if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_high)
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return 0;
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/* Limits are stored as integer values (signed, 9-bit). */
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if ((temp_low & 0x7f00) || (temp_high & 0x7f00))
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return 0;
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temp_hyst = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HYST);
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temp_crit = i2c_smbus_read_word_data(client, LM92_REG_TEMP_CRIT);
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if ((temp_hyst & 0x7f00) || (temp_crit & 0x7f00))
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return 0;
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/* Registers addresses were found to cycle over 16-byte boundaries.
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We don't test all registers with all offsets so as to save some
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reads and time, but this should still be sufficient to dismiss
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non-MAX6635 chips. */
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conf = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG);
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for (i=16; i<96; i*=2) {
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if (temp_hyst != i2c_smbus_read_word_data(client,
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LM92_REG_TEMP_HYST + i - 16)
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|| temp_crit != i2c_smbus_read_word_data(client,
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LM92_REG_TEMP_CRIT + i)
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|| temp_low != i2c_smbus_read_word_data(client,
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LM92_REG_TEMP_LOW + i + 16)
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|| temp_high != i2c_smbus_read_word_data(client,
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LM92_REG_TEMP_HIGH + i + 32)
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|| conf != i2c_smbus_read_byte_data(client,
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LM92_REG_CONFIG + i))
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return 0;
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}
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return 1;
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}
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static struct attribute *lm92_attributes[] = {
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&dev_attr_temp1_input.attr,
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&dev_attr_temp1_crit.attr,
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&dev_attr_temp1_crit_hyst.attr,
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&dev_attr_temp1_min.attr,
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&dev_attr_temp1_min_hyst.attr,
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&dev_attr_temp1_max.attr,
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&dev_attr_temp1_max_hyst.attr,
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&dev_attr_alarms.attr,
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NULL
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};
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static const struct attribute_group lm92_group = {
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.attrs = lm92_attributes,
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};
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/* The following function does more than just detection. If detection
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succeeds, it also registers the new chip. */
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static int lm92_detect(struct i2c_adapter *adapter, int address, int kind)
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{
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struct i2c_client *new_client;
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struct lm92_data *data;
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int err = 0;
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char *name;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
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| I2C_FUNC_SMBUS_WORD_DATA))
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goto exit;
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if (!(data = kzalloc(sizeof(struct lm92_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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/* Fill in enough client fields so that we can read from the chip,
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which is required for identication */
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new_client = &data->client;
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
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new_client->adapter = adapter;
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new_client->driver = &lm92_driver;
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new_client->flags = 0;
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/* A negative kind means that the driver was loaded with no force
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parameter (default), so we must identify the chip. */
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if (kind < 0) {
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u8 config = i2c_smbus_read_byte_data(new_client,
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LM92_REG_CONFIG);
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u16 man_id = i2c_smbus_read_word_data(new_client,
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LM92_REG_MAN_ID);
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if ((config & 0xe0) == 0x00
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&& man_id == 0x0180) {
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pr_info("lm92: Found National Semiconductor LM92 chip\n");
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kind = lm92;
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} else
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if (max6635_check(new_client)) {
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pr_info("lm92: Found Maxim MAX6635 chip\n");
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kind = lm92; /* No separate prefix */
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}
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else
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goto exit_free;
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} else
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if (kind == 0) /* Default to an LM92 if forced */
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kind = lm92;
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/* Give it the proper name */
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if (kind == lm92) {
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name = "lm92";
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} else { /* Supposedly cannot happen */
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dev_dbg(&new_client->dev, "Kind out of range?\n");
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goto exit_free;
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}
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/* Fill in the remaining client fields */
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strlcpy(new_client->name, name, I2C_NAME_SIZE);
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data->valid = 0;
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mutex_init(&data->update_lock);
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/* Tell the i2c subsystem a new client has arrived */
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if ((err = i2c_attach_client(new_client)))
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goto exit_free;
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/* Initialize the chipset */
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lm92_init_client(new_client);
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/* Register sysfs hooks */
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if ((err = sysfs_create_group(&new_client->dev.kobj, &lm92_group)))
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goto exit_detach;
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data->class_dev = hwmon_device_register(&new_client->dev);
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if (IS_ERR(data->class_dev)) {
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err = PTR_ERR(data->class_dev);
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goto exit_remove;
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}
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return 0;
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exit_remove:
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sysfs_remove_group(&new_client->dev.kobj, &lm92_group);
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exit_detach:
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i2c_detach_client(new_client);
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exit_free:
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kfree(data);
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exit:
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return err;
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}
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static int lm92_attach_adapter(struct i2c_adapter *adapter)
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{
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if (!(adapter->class & I2C_CLASS_HWMON))
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return 0;
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return i2c_probe(adapter, &addr_data, lm92_detect);
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}
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static int lm92_detach_client(struct i2c_client *client)
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{
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struct lm92_data *data = i2c_get_clientdata(client);
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int err;
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hwmon_device_unregister(data->class_dev);
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sysfs_remove_group(&client->dev.kobj, &lm92_group);
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if ((err = i2c_detach_client(client)))
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return err;
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kfree(data);
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return 0;
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}
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/*
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* Module and driver stuff
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*/
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static struct i2c_driver lm92_driver = {
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.driver = {
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.name = "lm92",
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},
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.id = I2C_DRIVERID_LM92,
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.attach_adapter = lm92_attach_adapter,
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.detach_client = lm92_detach_client,
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};
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static int __init sensors_lm92_init(void)
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{
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return i2c_add_driver(&lm92_driver);
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}
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static void __exit sensors_lm92_exit(void)
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{
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i2c_del_driver(&lm92_driver);
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}
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MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
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MODULE_DESCRIPTION("LM92/MAX6635 driver");
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MODULE_LICENSE("GPL");
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module_init(sensors_lm92_init);
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module_exit(sensors_lm92_exit);
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