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![Deepak Saxena](/assets/img/avatar_default.png)
Use kzalloc instead of kmalloc+memset in all hardware monitoring drivers. Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
416 lines
12 KiB
C
416 lines
12 KiB
C
/*
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* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2003-2005 Jean Delvare <khali@linux-fr.org>
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*
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* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
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* a sensor chip made by National Semiconductor. It reports up to four
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* temperatures (its own plus up to three external ones) with a 1 deg
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* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
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* from National's website at:
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* http://www.national.com/pf/LM/LM83.html
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* Since the datasheet omits to give the chip stepping code, I give it
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* here: 0x03 (at register 0xff).
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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/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/hwmon.h>
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#include <linux/err.h>
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/*
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* Addresses to scan
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* Address is selected using 2 three-level pins, resulting in 9 possible
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* addresses.
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*/
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static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
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0x29, 0x2a, 0x2b,
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0x4c, 0x4d, 0x4e,
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I2C_CLIENT_END };
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/*
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* Insmod parameters
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*/
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I2C_CLIENT_INSMOD_1(lm83);
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/*
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* The LM83 registers
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* Manufacturer ID is 0x01 for National Semiconductor.
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*/
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#define LM83_REG_R_MAN_ID 0xFE
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#define LM83_REG_R_CHIP_ID 0xFF
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#define LM83_REG_R_CONFIG 0x03
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#define LM83_REG_W_CONFIG 0x09
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#define LM83_REG_R_STATUS1 0x02
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#define LM83_REG_R_STATUS2 0x35
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#define LM83_REG_R_LOCAL_TEMP 0x00
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#define LM83_REG_R_LOCAL_HIGH 0x05
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#define LM83_REG_W_LOCAL_HIGH 0x0B
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#define LM83_REG_R_REMOTE1_TEMP 0x30
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#define LM83_REG_R_REMOTE1_HIGH 0x38
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#define LM83_REG_W_REMOTE1_HIGH 0x50
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#define LM83_REG_R_REMOTE2_TEMP 0x01
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#define LM83_REG_R_REMOTE2_HIGH 0x07
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#define LM83_REG_W_REMOTE2_HIGH 0x0D
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#define LM83_REG_R_REMOTE3_TEMP 0x31
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#define LM83_REG_R_REMOTE3_HIGH 0x3A
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#define LM83_REG_W_REMOTE3_HIGH 0x52
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#define LM83_REG_R_TCRIT 0x42
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#define LM83_REG_W_TCRIT 0x5A
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/*
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* Conversions and various macros
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* The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
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*/
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#define TEMP_FROM_REG(val) ((val) * 1000)
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#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
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(val) >= 127000 ? 127 : \
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(val) < 0 ? ((val) - 500) / 1000 : \
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((val) + 500) / 1000)
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static const u8 LM83_REG_R_TEMP[] = {
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LM83_REG_R_LOCAL_TEMP,
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LM83_REG_R_REMOTE1_TEMP,
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LM83_REG_R_REMOTE2_TEMP,
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LM83_REG_R_REMOTE3_TEMP,
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LM83_REG_R_LOCAL_HIGH,
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LM83_REG_R_REMOTE1_HIGH,
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LM83_REG_R_REMOTE2_HIGH,
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LM83_REG_R_REMOTE3_HIGH,
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LM83_REG_R_TCRIT,
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};
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static const u8 LM83_REG_W_HIGH[] = {
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LM83_REG_W_LOCAL_HIGH,
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LM83_REG_W_REMOTE1_HIGH,
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LM83_REG_W_REMOTE2_HIGH,
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LM83_REG_W_REMOTE3_HIGH,
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LM83_REG_W_TCRIT,
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};
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/*
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* Functions declaration
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*/
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static int lm83_attach_adapter(struct i2c_adapter *adapter);
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static int lm83_detect(struct i2c_adapter *adapter, int address, int kind);
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static int lm83_detach_client(struct i2c_client *client);
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static struct lm83_data *lm83_update_device(struct device *dev);
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/*
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* Driver data (common to all clients)
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*/
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static struct i2c_driver lm83_driver = {
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.owner = THIS_MODULE,
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.name = "lm83",
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.id = I2C_DRIVERID_LM83,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = lm83_attach_adapter,
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.detach_client = lm83_detach_client,
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};
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/*
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* Client data (each client gets its own)
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*/
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struct lm83_data {
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struct i2c_client client;
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struct class_device *class_dev;
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struct semaphore 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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s8 temp[9]; /* 0..3: input 1-4,
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4..7: high limit 1-4,
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8 : critical limit */
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u16 alarms; /* bitvector, combined */
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};
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/*
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* Sysfs stuff
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*/
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static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm83_data *data = lm83_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
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}
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static ssize_t set_temp(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 sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i2c_client *client = to_i2c_client(dev);
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struct lm83_data *data = i2c_get_clientdata(client);
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long val = simple_strtol(buf, NULL, 10);
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int nr = attr->index;
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down(&data->update_lock);
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data->temp[nr] = TEMP_TO_REG(val);
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i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
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data->temp[nr]);
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up(&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 *dummy,
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char *buf)
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{
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struct lm83_data *data = lm83_update_device(dev);
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return sprintf(buf, "%d\n", data->alarms);
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
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set_temp, 4);
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static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp,
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set_temp, 5);
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static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp,
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set_temp, 6);
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static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp,
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set_temp, 7);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
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static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
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static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
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set_temp, 8);
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static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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/*
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* Real code
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*/
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static int lm83_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, lm83_detect);
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}
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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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*/
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static int lm83_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 lm83_data *data;
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int err = 0;
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const char *name = "";
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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goto exit;
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if (!(data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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/* The common I2C client data is placed right after the
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* LM83-specific data. */
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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 = &lm83_driver;
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new_client->flags = 0;
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/* Now we do the detection and identification. A negative kind
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* means that the driver was loaded with no force parameter
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* (default), so we must both detect and identify the chip
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* (actually there is only one possible kind of chip for now, LM83).
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* A zero kind means that the driver was loaded with the force
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* parameter, the detection step shall be skipped. A positive kind
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* means that the driver was loaded with the force parameter and a
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* given kind of chip is requested, so both the detection and the
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* identification steps are skipped. */
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/* Default to an LM83 if forced */
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if (kind == 0)
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kind = lm83;
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if (kind < 0) { /* detection */
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if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
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& 0xA8) != 0x00) ||
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((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
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& 0x48) != 0x00) ||
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((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
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& 0x41) != 0x00)) {
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dev_dbg(&adapter->dev,
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"LM83 detection failed at 0x%02x.\n", address);
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goto exit_free;
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}
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}
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if (kind <= 0) { /* identification */
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u8 man_id, chip_id;
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man_id = i2c_smbus_read_byte_data(new_client,
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LM83_REG_R_MAN_ID);
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chip_id = i2c_smbus_read_byte_data(new_client,
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LM83_REG_R_CHIP_ID);
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if (man_id == 0x01) { /* National Semiconductor */
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if (chip_id == 0x03) {
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kind = lm83;
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}
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}
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if (kind <= 0) { /* identification failed */
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dev_info(&adapter->dev,
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"Unsupported chip (man_id=0x%02X, "
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"chip_id=0x%02X).\n", man_id, chip_id);
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goto exit_free;
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}
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}
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if (kind == lm83) {
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name = "lm83";
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}
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/* We can 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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init_MUTEX(&data->update_lock);
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/* Tell the I2C layer 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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/*
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* Initialize the LM83 chip
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* (Nothing to do for this one.)
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*/
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/* Register sysfs hooks */
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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_detach;
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}
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp1_input.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp2_input.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp3_input.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp4_input.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp1_max.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp2_max.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp3_max.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp4_max.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp1_crit.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp2_crit.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp3_crit.dev_attr);
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device_create_file(&new_client->dev,
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&sensor_dev_attr_temp4_crit.dev_attr);
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device_create_file(&new_client->dev, &dev_attr_alarms);
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return 0;
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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 lm83_detach_client(struct i2c_client *client)
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{
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struct lm83_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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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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static struct lm83_data *lm83_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 lm83_data *data = i2c_get_clientdata(client);
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down(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
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int nr;
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dev_dbg(&client->dev, "Updating lm83 data.\n");
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for (nr = 0; nr < 9; nr++) {
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data->temp[nr] =
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i2c_smbus_read_byte_data(client,
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LM83_REG_R_TEMP[nr]);
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}
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data->alarms =
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i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
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+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
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<< 8);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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up(&data->update_lock);
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return data;
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}
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static int __init sensors_lm83_init(void)
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{
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return i2c_add_driver(&lm83_driver);
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}
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static void __exit sensors_lm83_exit(void)
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{
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i2c_del_driver(&lm83_driver);
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}
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MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
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MODULE_DESCRIPTION("LM83 driver");
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MODULE_LICENSE("GPL");
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module_init(sensors_lm83_init);
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module_exit(sensors_lm83_exit);
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