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![Jean Delvare](/assets/img/avatar_default.png)
The legacy i2c binding model is going away really soon now, so convert the lm95241 driver to the new binding model or it will break. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Davide Rizzo <elpa.rizzo@gmail.com>
509 lines
14 KiB
C
509 lines
14 KiB
C
/*
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* lm95241.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2008 Davide Rizzo <elpa-rizzo@gmail.com>
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*
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* Based on the max1619 driver. The LM95241 is a sensor chip made by National
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* Semiconductors.
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* It reports up to three temperatures (its own plus up to
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* two external ones). Complete datasheet can be
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* obtained from National's website at:
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* http://www.national.com/ds.cgi/LM/LM95241.pdf
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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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static const unsigned short normal_i2c[] = {
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0x19, 0x2a, 0x2b, I2C_CLIENT_END};
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/* Insmod parameters */
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I2C_CLIENT_INSMOD_1(lm95241);
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/* LM95241 registers */
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#define LM95241_REG_R_MAN_ID 0xFE
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#define LM95241_REG_R_CHIP_ID 0xFF
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#define LM95241_REG_R_STATUS 0x02
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#define LM95241_REG_RW_CONFIG 0x03
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#define LM95241_REG_RW_REM_FILTER 0x06
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#define LM95241_REG_RW_TRUTHERM 0x07
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#define LM95241_REG_W_ONE_SHOT 0x0F
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#define LM95241_REG_R_LOCAL_TEMPH 0x10
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#define LM95241_REG_R_REMOTE1_TEMPH 0x11
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#define LM95241_REG_R_REMOTE2_TEMPH 0x12
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#define LM95241_REG_R_LOCAL_TEMPL 0x20
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#define LM95241_REG_R_REMOTE1_TEMPL 0x21
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#define LM95241_REG_R_REMOTE2_TEMPL 0x22
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#define LM95241_REG_RW_REMOTE_MODEL 0x30
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/* LM95241 specific bitfields */
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#define CFG_STOP 0x40
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#define CFG_CR0076 0x00
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#define CFG_CR0182 0x10
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#define CFG_CR1000 0x20
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#define CFG_CR2700 0x30
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#define R1MS_SHIFT 0
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#define R2MS_SHIFT 2
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#define R1MS_MASK (0x01 << (R1MS_SHIFT))
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#define R2MS_MASK (0x01 << (R2MS_SHIFT))
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#define R1DF_SHIFT 1
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#define R2DF_SHIFT 2
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#define R1DF_MASK (0x01 << (R1DF_SHIFT))
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#define R2DF_MASK (0x01 << (R2DF_SHIFT))
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#define R1FE_MASK 0x01
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#define R2FE_MASK 0x05
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#define TT1_SHIFT 0
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#define TT2_SHIFT 4
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#define TT_OFF 0
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#define TT_ON 1
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#define TT_MASK 7
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#define MANUFACTURER_ID 0x01
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#define DEFAULT_REVISION 0xA4
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/* Conversions and various macros */
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#define TEMP_FROM_REG(val_h, val_l) (((val_h) & 0x80 ? (val_h) - 0x100 : \
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(val_h)) * 1000 + (val_l) * 1000 / 256)
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/* Functions declaration */
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static void lm95241_init_client(struct i2c_client *client);
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static struct lm95241_data *lm95241_update_device(struct device *dev);
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/* Client data (each client gets its own) */
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struct lm95241_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, rate; /* in jiffies */
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char valid; /* zero until following fields are valid */
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/* registers values */
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u8 local_h, local_l; /* local */
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u8 remote1_h, remote1_l; /* remote1 */
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u8 remote2_h, remote2_l; /* remote2 */
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u8 config, model, trutherm;
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};
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/* Sysfs stuff */
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#define show_temp(value) \
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static ssize_t show_##value(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct lm95241_data *data = lm95241_update_device(dev); \
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snprintf(buf, PAGE_SIZE - 1, "%d\n", \
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TEMP_FROM_REG(data->value##_h, data->value##_l)); \
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return strlen(buf); \
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}
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show_temp(local);
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show_temp(remote1);
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show_temp(remote2);
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static ssize_t show_rate(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct lm95241_data *data = lm95241_update_device(dev);
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snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->rate / HZ);
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return strlen(buf);
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}
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static ssize_t set_rate(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 lm95241_data *data = i2c_get_clientdata(client);
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strict_strtol(buf, 10, &data->rate);
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data->rate = data->rate * HZ / 1000;
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return count;
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}
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#define show_type(flag) \
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static ssize_t show_type##flag(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct lm95241_data *data = i2c_get_clientdata(client); \
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\
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snprintf(buf, PAGE_SIZE - 1, \
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data->model & R##flag##MS_MASK ? "1\n" : "2\n"); \
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return strlen(buf); \
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}
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show_type(1);
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show_type(2);
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#define show_min(flag) \
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static ssize_t show_min##flag(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct lm95241_data *data = i2c_get_clientdata(client); \
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\
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snprintf(buf, PAGE_SIZE - 1, \
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data->config & R##flag##DF_MASK ? \
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"-127000\n" : "0\n"); \
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return strlen(buf); \
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}
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show_min(1);
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show_min(2);
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#define show_max(flag) \
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static ssize_t show_max##flag(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct lm95241_data *data = i2c_get_clientdata(client); \
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\
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snprintf(buf, PAGE_SIZE - 1, \
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data->config & R##flag##DF_MASK ? \
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"127000\n" : "255000\n"); \
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return strlen(buf); \
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}
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show_max(1);
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show_max(2);
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#define set_type(flag) \
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static ssize_t set_type##flag(struct device *dev, \
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struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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struct i2c_client *client = to_i2c_client(dev); \
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struct lm95241_data *data = i2c_get_clientdata(client); \
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\
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long val; \
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strict_strtol(buf, 10, &val); \
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\
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if ((val == 1) || (val == 2)) { \
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\
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mutex_lock(&data->update_lock); \
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\
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data->trutherm &= ~(TT_MASK << TT##flag##_SHIFT); \
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if (val == 1) { \
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data->model |= R##flag##MS_MASK; \
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data->trutherm |= (TT_ON << TT##flag##_SHIFT); \
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} \
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else { \
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data->model &= ~R##flag##MS_MASK; \
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data->trutherm |= (TT_OFF << TT##flag##_SHIFT); \
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} \
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\
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data->valid = 0; \
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\
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i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL, \
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data->model); \
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i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM, \
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data->trutherm); \
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\
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mutex_unlock(&data->update_lock); \
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\
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} \
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return count; \
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}
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set_type(1);
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set_type(2);
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#define set_min(flag) \
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static ssize_t set_min##flag(struct device *dev, \
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struct device_attribute *devattr, 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 lm95241_data *data = i2c_get_clientdata(client); \
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\
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long val; \
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strict_strtol(buf, 10, &val); \
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\
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mutex_lock(&data->update_lock); \
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\
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if (val < 0) \
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data->config |= R##flag##DF_MASK; \
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else \
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data->config &= ~R##flag##DF_MASK; \
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\
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data->valid = 0; \
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\
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i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, \
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data->config); \
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\
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mutex_unlock(&data->update_lock); \
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\
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return count; \
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}
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set_min(1);
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set_min(2);
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#define set_max(flag) \
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static ssize_t set_max##flag(struct device *dev, \
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struct device_attribute *devattr, 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 lm95241_data *data = i2c_get_clientdata(client); \
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\
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long val; \
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strict_strtol(buf, 10, &val); \
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\
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mutex_lock(&data->update_lock); \
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\
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if (val <= 127000) \
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data->config |= R##flag##DF_MASK; \
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else \
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data->config &= ~R##flag##DF_MASK; \
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\
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data->valid = 0; \
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\
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i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, \
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data->config); \
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\
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mutex_unlock(&data->update_lock); \
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\
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return count; \
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}
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set_max(1);
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set_max(2);
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static DEVICE_ATTR(temp1_input, S_IRUGO, show_local, NULL);
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static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote1, NULL);
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static DEVICE_ATTR(temp3_input, S_IRUGO, show_remote2, NULL);
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static DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type1, set_type1);
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static DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type2, set_type2);
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static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min1, set_min1);
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static DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min2, set_min2);
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static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max1, set_max1);
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static DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max2, set_max2);
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static DEVICE_ATTR(rate, S_IWUSR | S_IRUGO, show_rate, set_rate);
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static struct attribute *lm95241_attributes[] = {
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&dev_attr_temp1_input.attr,
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&dev_attr_temp2_input.attr,
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&dev_attr_temp3_input.attr,
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&dev_attr_temp2_type.attr,
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&dev_attr_temp3_type.attr,
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&dev_attr_temp2_min.attr,
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&dev_attr_temp3_min.attr,
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&dev_attr_temp2_max.attr,
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&dev_attr_temp3_max.attr,
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&dev_attr_rate.attr,
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NULL
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};
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static const struct attribute_group lm95241_group = {
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.attrs = lm95241_attributes,
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};
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int lm95241_detect(struct i2c_client *new_client, int kind,
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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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int address = new_client->addr;
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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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return -ENODEV;
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/*
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* Now we do the remaining detection. A negative kind means that
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* the driver was loaded with no force parameter (default), so we
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* must both detect and identify the chip. A zero kind means that
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* the driver was loaded with the force parameter, the detection
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* step shall be skipped. A positive kind means that the driver
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* was loaded with the force parameter and a given kind of chip is
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* requested, so both the detection and the identification steps
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* are skipped.
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*/
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if (kind < 0) { /* detection */
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if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID)
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!= MANUFACTURER_ID)
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|| (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
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< DEFAULT_REVISION)) {
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dev_dbg(&adapter->dev,
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"LM95241 detection failed at 0x%02x.\n",
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address);
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return -ENODEV;
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}
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}
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if (kind <= 0) { /* identification */
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if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID)
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== MANUFACTURER_ID)
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&& (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
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>= DEFAULT_REVISION)) {
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kind = lm95241;
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if (kind <= 0) { /* identification failed */
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dev_info(&adapter->dev, "Unsupported chip\n");
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return -ENODEV;
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}
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}
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}
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/* Fill the i2c board info */
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if (kind == lm95241)
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name = "lm95241";
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strlcpy(info->type, name, I2C_NAME_SIZE);
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return 0;
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}
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static int lm95241_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 lm95241_data *data;
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int err;
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data = kzalloc(sizeof(struct lm95241_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 LM95241 chip */
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lm95241_init_client(new_client);
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/* Register sysfs hooks */
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err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group);
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if (err)
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goto exit_free;
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data->hwmon_dev = hwmon_device_register(&new_client->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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goto exit_remove_files;
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}
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return 0;
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exit_remove_files:
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sysfs_remove_group(&new_client->dev.kobj, &lm95241_group);
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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 void lm95241_init_client(struct i2c_client *client)
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{
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struct lm95241_data *data = i2c_get_clientdata(client);
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data->rate = HZ; /* 1 sec default */
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data->valid = 0;
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data->config = CFG_CR0076;
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data->model = 0;
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data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
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i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG,
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data->config);
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i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
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R1FE_MASK | R2FE_MASK);
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i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
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data->trutherm);
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i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
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data->model);
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}
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static int lm95241_remove(struct i2c_client *client)
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{
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struct lm95241_data *data = i2c_get_clientdata(client);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &lm95241_group);
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i2c_set_clientdata(client, NULL);
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kfree(data);
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return 0;
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}
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static struct lm95241_data *lm95241_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 lm95241_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 + data->rate) ||
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!data->valid) {
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dev_dbg(&client->dev, "Updating lm95241 data.\n");
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data->local_h =
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i2c_smbus_read_byte_data(client,
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LM95241_REG_R_LOCAL_TEMPH);
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data->local_l =
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i2c_smbus_read_byte_data(client,
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LM95241_REG_R_LOCAL_TEMPL);
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data->remote1_h =
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i2c_smbus_read_byte_data(client,
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LM95241_REG_R_REMOTE1_TEMPH);
|
|
data->remote1_l =
|
|
i2c_smbus_read_byte_data(client,
|
|
LM95241_REG_R_REMOTE1_TEMPL);
|
|
data->remote2_h =
|
|
i2c_smbus_read_byte_data(client,
|
|
LM95241_REG_R_REMOTE2_TEMPH);
|
|
data->remote2_l =
|
|
i2c_smbus_read_byte_data(client,
|
|
LM95241_REG_R_REMOTE2_TEMPL);
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
/* Driver data (common to all clients) */
|
|
static const struct i2c_device_id lm95241_id[] = {
|
|
{ "lm95241", lm95241 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm95241_id);
|
|
|
|
static struct i2c_driver lm95241_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "lm95241",
|
|
},
|
|
.probe = lm95241_probe,
|
|
.remove = lm95241_remove,
|
|
.id_table = lm95241_id,
|
|
.detect = lm95241_detect,
|
|
.address_data = &addr_data,
|
|
};
|
|
|
|
static int __init sensors_lm95241_init(void)
|
|
{
|
|
return i2c_add_driver(&lm95241_driver);
|
|
}
|
|
|
|
static void __exit sensors_lm95241_exit(void)
|
|
{
|
|
i2c_del_driver(&lm95241_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Davide Rizzo <elpa-rizzo@gmail.com>");
|
|
MODULE_DESCRIPTION("LM95241 sensor driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sensors_lm95241_init);
|
|
module_exit(sensors_lm95241_exit);
|