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179c4fdb56
replaced strict_strtol with kstrtol and replaced strict_strtuol with kstrtuol This satisfies checkpatch -f Compile tested only: no warnings or errors given Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
544 lines
14 KiB
C
544 lines
14 KiB
C
/*
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* Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
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*
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* The LM95245 is a sensor chip made by National Semiconductors.
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* It reports up to two temperatures (its own plus an external one).
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* Complete datasheet can be obtained from National's website at:
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* http://www.national.com/ds.cgi/LM/LM95245.pdf
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*
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* This driver is based on lm95241.c
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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.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 DEVNAME "lm95245"
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static const unsigned short normal_i2c[] = {
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0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
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/* LM95245 registers */
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/* general registers */
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#define LM95245_REG_RW_CONFIG1 0x03
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#define LM95245_REG_RW_CONVERS_RATE 0x04
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#define LM95245_REG_W_ONE_SHOT 0x0F
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/* diode configuration */
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#define LM95245_REG_RW_CONFIG2 0xBF
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#define LM95245_REG_RW_REMOTE_OFFH 0x11
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#define LM95245_REG_RW_REMOTE_OFFL 0x12
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/* status registers */
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#define LM95245_REG_R_STATUS1 0x02
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#define LM95245_REG_R_STATUS2 0x33
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/* limit registers */
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#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
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#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
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#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
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#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
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/* temperature signed */
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#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
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#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
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#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
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#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
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/* temperature unsigned */
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#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
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#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
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/* id registers */
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#define LM95245_REG_R_MAN_ID 0xFE
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#define LM95245_REG_R_CHIP_ID 0xFF
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/* LM95245 specific bitfields */
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#define CFG_STOP 0x40
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#define CFG_REMOTE_TCRIT_MASK 0x10
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#define CFG_REMOTE_OS_MASK 0x08
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#define CFG_LOCAL_TCRIT_MASK 0x04
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#define CFG_LOCAL_OS_MASK 0x02
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#define CFG2_OS_A0 0x40
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#define CFG2_DIODE_FAULT_OS 0x20
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#define CFG2_DIODE_FAULT_TCRIT 0x10
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#define CFG2_REMOTE_TT 0x08
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#define CFG2_REMOTE_FILTER_DIS 0x00
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#define CFG2_REMOTE_FILTER_EN 0x06
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/* conversation rate in ms */
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#define RATE_CR0063 0x00
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#define RATE_CR0364 0x01
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#define RATE_CR1000 0x02
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#define RATE_CR2500 0x03
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#define STATUS1_DIODE_FAULT 0x04
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#define STATUS1_RTCRIT 0x02
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#define STATUS1_LOC 0x01
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#define MANUFACTURER_ID 0x01
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#define DEFAULT_REVISION 0xB3
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static const u8 lm95245_reg_address[] = {
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LM95245_REG_R_LOCAL_TEMPH_S,
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LM95245_REG_R_LOCAL_TEMPL_S,
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LM95245_REG_R_REMOTE_TEMPH_S,
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LM95245_REG_R_REMOTE_TEMPL_S,
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LM95245_REG_R_REMOTE_TEMPH_U,
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LM95245_REG_R_REMOTE_TEMPL_U,
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LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
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LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
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LM95245_REG_RW_COMMON_HYSTERESIS,
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LM95245_REG_R_STATUS1,
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};
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/* Client data (each client gets its own) */
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struct lm95245_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; /* in jiffies */
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unsigned long interval; /* in msecs */
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bool valid; /* zero until following fields are valid */
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/* registers values */
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u8 regs[ARRAY_SIZE(lm95245_reg_address)];
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u8 config1, config2;
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};
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/* Conversions */
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static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
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{
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return val_h * 1000 + val_l * 1000 / 256;
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}
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static int temp_from_reg_signed(u8 val_h, u8 val_l)
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{
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if (val_h & 0x80)
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return (val_h - 0x100) * 1000;
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return temp_from_reg_unsigned(val_h, val_l);
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}
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static struct lm95245_data *lm95245_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 lm95245_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
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+ msecs_to_jiffies(data->interval)) || !data->valid) {
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int i;
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dev_dbg(&client->dev, "Updating lm95245 data.\n");
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for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
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data->regs[i]
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= i2c_smbus_read_byte_data(client,
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lm95245_reg_address[i]);
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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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static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
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{
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int rate;
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unsigned long interval;
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rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);
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switch (rate) {
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case RATE_CR0063:
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interval = 63;
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break;
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case RATE_CR0364:
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interval = 364;
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break;
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case RATE_CR1000:
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interval = 1000;
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break;
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case RATE_CR2500:
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default:
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interval = 2500;
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break;
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}
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return interval;
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}
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static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
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unsigned long interval)
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{
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int rate;
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if (interval <= 63) {
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interval = 63;
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rate = RATE_CR0063;
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} else if (interval <= 364) {
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interval = 364;
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rate = RATE_CR0364;
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} else if (interval <= 1000) {
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interval = 1000;
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rate = RATE_CR1000;
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} else {
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interval = 2500;
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rate = RATE_CR2500;
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}
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i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);
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return interval;
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}
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/* Sysfs stuff */
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static ssize_t show_input(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct lm95245_data *data = lm95245_update_device(dev);
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int temp;
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int index = to_sensor_dev_attr(attr)->index;
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/*
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* Index 0 (Local temp) is always signed
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* Index 2 (Remote temp) has both signed and unsigned data
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* use signed calculation for remote if signed bit is set
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*/
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if (index == 0 || data->regs[index] & 0x80)
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temp = temp_from_reg_signed(data->regs[index],
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data->regs[index + 1]);
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else
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temp = temp_from_reg_unsigned(data->regs[index + 2],
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data->regs[index + 3]);
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return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
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}
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static ssize_t show_limit(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct lm95245_data *data = lm95245_update_device(dev);
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int index = to_sensor_dev_attr(attr)->index;
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return snprintf(buf, PAGE_SIZE - 1, "%d\n",
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data->regs[index] * 1000);
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}
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static ssize_t set_limit(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 lm95245_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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unsigned long val;
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if (kstrtoul(buf, 10, &val) < 0)
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return -EINVAL;
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val /= 1000;
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val = SENSORS_LIMIT(val, 0, (index == 6 ? 127 : 255));
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mutex_lock(&data->update_lock);
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data->valid = 0;
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i2c_smbus_write_byte_data(client, lm95245_reg_address[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 set_crit_hyst(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 lm95245_data *data = i2c_get_clientdata(client);
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unsigned long val;
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if (kstrtoul(buf, 10, &val) < 0)
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return -EINVAL;
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val /= 1000;
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val = SENSORS_LIMIT(val, 0, 31);
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mutex_lock(&data->update_lock);
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data->valid = 0;
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/* shared crit hysteresis */
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i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
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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_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 lm95245_data *data = i2c_get_clientdata(client);
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return snprintf(buf, PAGE_SIZE - 1,
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data->config2 & CFG2_REMOTE_TT ? "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 lm95245_data *data = i2c_get_clientdata(client);
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unsigned long val;
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if (kstrtoul(buf, 10, &val) < 0)
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return -EINVAL;
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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->config2 |= CFG2_REMOTE_TT;
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else
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data->config2 &= ~CFG2_REMOTE_TT;
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data->valid = 0;
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i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
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data->config2);
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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_alarm(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct lm95245_data *data = lm95245_update_device(dev);
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int index = to_sensor_dev_attr(attr)->index;
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return snprintf(buf, PAGE_SIZE - 1, "%d\n",
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!!(data->regs[9] & index));
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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 lm95245_data *data = lm95245_update_device(dev);
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return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
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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 lm95245_data *data = i2c_get_clientdata(client);
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unsigned long val;
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if (kstrtoul(buf, 10, &val) < 0)
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return -EINVAL;
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mutex_lock(&data->update_lock);
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data->interval = lm95245_set_conversion_rate(client, 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 SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_limit,
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set_limit, 6);
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static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
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set_crit_hyst, 8);
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static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
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STATUS1_LOC);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_limit,
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set_limit, 7);
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static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
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set_crit_hyst, 8);
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static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
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STATUS1_RTCRIT);
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static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type,
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set_type, 0);
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static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
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STATUS1_DIODE_FAULT);
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static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
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set_interval);
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static struct attribute *lm95245_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_crit.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_type.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&dev_attr_update_interval.attr,
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NULL
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};
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static const struct attribute_group lm95245_group = {
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.attrs = lm95245_attributes,
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};
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int lm95245_detect(struct i2c_client *new_client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = new_client->adapter;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
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!= MANUFACTURER_ID
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|| i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
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!= DEFAULT_REVISION)
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return -ENODEV;
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strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
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return 0;
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}
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static void lm95245_init_client(struct i2c_client *client)
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{
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struct lm95245_data *data = i2c_get_clientdata(client);
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data->valid = 0;
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data->interval = lm95245_read_conversion_rate(client);
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data->config1 = i2c_smbus_read_byte_data(client,
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LM95245_REG_RW_CONFIG1);
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data->config2 = i2c_smbus_read_byte_data(client,
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LM95245_REG_RW_CONFIG2);
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if (data->config1 & CFG_STOP) {
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/* Clear the standby bit */
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data->config1 &= ~CFG_STOP;
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i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
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data->config1);
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}
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}
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static int lm95245_probe(struct i2c_client *new_client,
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const struct i2c_device_id *id)
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{
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struct lm95245_data *data;
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int err;
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data = kzalloc(sizeof(struct lm95245_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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goto exit;
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}
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i2c_set_clientdata(new_client, data);
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mutex_init(&data->update_lock);
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/* Initialize the LM95245 chip */
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lm95245_init_client(new_client);
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/* Register sysfs hooks */
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err = sysfs_create_group(&new_client->dev.kobj, &lm95245_group);
|
|
if (err)
|
|
goto exit_free;
|
|
|
|
data->hwmon_dev = hwmon_device_register(&new_client->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(&new_client->dev.kobj, &lm95245_group);
|
|
exit_free:
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int lm95245_remove(struct i2c_client *client)
|
|
{
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &lm95245_group);
|
|
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
/* Driver data (common to all clients) */
|
|
static const struct i2c_device_id lm95245_id[] = {
|
|
{ DEVNAME, 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm95245_id);
|
|
|
|
static struct i2c_driver lm95245_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = DEVNAME,
|
|
},
|
|
.probe = lm95245_probe,
|
|
.remove = lm95245_remove,
|
|
.id_table = lm95245_id,
|
|
.detect = lm95245_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
static int __init sensors_lm95245_init(void)
|
|
{
|
|
return i2c_add_driver(&lm95245_driver);
|
|
}
|
|
|
|
static void __exit sensors_lm95245_exit(void)
|
|
{
|
|
i2c_del_driver(&lm95245_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
|
|
MODULE_DESCRIPTION("LM95245 sensor driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sensors_lm95245_init);
|
|
module_exit(sensors_lm95245_exit);
|