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authorJean Delvare <khali@linux-fr.org>2005-07-02 18:20:26 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2005-07-11 14:42:50 -0700
commit8d5d45fb14680326f833295f2316a4ec5e357220 (patch)
tree3b29dbdea18dfecf33b18219c6c374316d99b88b /drivers/i2c/chips/lm90.c
parentad2f931dcb41bcfae38cc77d78b7821dfef83cf2 (diff)
[PATCH] I2C: Move hwmon drivers (2/3)
Part 2: Move the driver files themselves. Note that the patch "adds trailing whitespace", because it does move the files as-is, and some files happen to have trailing whitespace. From: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/i2c/chips/lm90.c')
-rw-r--r--drivers/i2c/chips/lm90.c655
1 files changed, 0 insertions, 655 deletions
diff --git a/drivers/i2c/chips/lm90.c b/drivers/i2c/chips/lm90.c
deleted file mode 100644
index a67dcadf7cb..00000000000
--- a/drivers/i2c/chips/lm90.c
+++ /dev/null
@@ -1,655 +0,0 @@
-/*
- * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
- * monitoring
- * Copyright (C) 2003-2005 Jean Delvare <khali@linux-fr.org>
- *
- * Based on the lm83 driver. The LM90 is a sensor chip made by National
- * Semiconductor. It reports up to two temperatures (its own plus up to
- * one external one) with a 0.125 deg resolution (1 deg for local
- * temperature) and a 3-4 deg accuracy. Complete datasheet can be
- * obtained from National's website at:
- * http://www.national.com/pf/LM/LM90.html
- *
- * This driver also supports the LM89 and LM99, two other sensor chips
- * made by National Semiconductor. Both have an increased remote
- * temperature measurement accuracy (1 degree), and the LM99
- * additionally shifts remote temperatures (measured and limits) by 16
- * degrees, which allows for higher temperatures measurement. The
- * driver doesn't handle it since it can be done easily in user-space.
- * Complete datasheets can be obtained from National's website at:
- * http://www.national.com/pf/LM/LM89.html
- * http://www.national.com/pf/LM/LM99.html
- * Note that there is no way to differentiate between both chips.
- *
- * This driver also supports the LM86, another sensor chip made by
- * National Semiconductor. It is exactly similar to the LM90 except it
- * has a higher accuracy.
- * Complete datasheet can be obtained from National's website at:
- * http://www.national.com/pf/LM/LM86.html
- *
- * This driver also supports the ADM1032, a sensor chip made by Analog
- * Devices. That chip is similar to the LM90, with a few differences
- * that are not handled by this driver. Complete datasheet can be
- * obtained from Analog's website at:
- * http://products.analog.com/products/info.asp?product=ADM1032
- * Among others, it has a higher accuracy than the LM90, much like the
- * LM86 does.
- *
- * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
- * chips made by Maxim. These chips are similar to the LM86. Complete
- * datasheet can be obtained at Maxim's website at:
- * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
- * Note that there is no easy way to differentiate between the three
- * variants. The extra address and features of the MAX6659 are not
- * supported by this driver.
- *
- * This driver also supports the ADT7461 chip from Analog Devices but
- * only in its "compatability mode". If an ADT7461 chip is found but
- * is configured in non-compatible mode (where its temperature
- * register values are decoded differently) it is ignored by this
- * driver. Complete datasheet can be obtained from Analog's website
- * at:
- * http://products.analog.com/products/info.asp?product=ADT7461
- *
- * Since the LM90 was the first chipset supported by this driver, most
- * comments will refer to this chipset, but are actually general and
- * concern all supported chipsets, unless mentioned otherwise.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/jiffies.h>
-#include <linux/i2c.h>
-#include <linux/i2c-sensor.h>
-#include <linux/hwmon-sysfs.h>
-
-/*
- * Addresses to scan
- * Address is fully defined internally and cannot be changed except for
- * MAX6659.
- * LM86, LM89, LM90, LM99, ADM1032, MAX6657 and MAX6658 have address 0x4c.
- * LM89-1, and LM99-1 have address 0x4d.
- * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
- * ADT7461 always has address 0x4c.
- */
-
-static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END };
-static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
-
-/*
- * Insmod parameters
- */
-
-SENSORS_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461);
-
-/*
- * The LM90 registers
- */
-
-#define LM90_REG_R_MAN_ID 0xFE
-#define LM90_REG_R_CHIP_ID 0xFF
-#define LM90_REG_R_CONFIG1 0x03
-#define LM90_REG_W_CONFIG1 0x09
-#define LM90_REG_R_CONFIG2 0xBF
-#define LM90_REG_W_CONFIG2 0xBF
-#define LM90_REG_R_CONVRATE 0x04
-#define LM90_REG_W_CONVRATE 0x0A
-#define LM90_REG_R_STATUS 0x02
-#define LM90_REG_R_LOCAL_TEMP 0x00
-#define LM90_REG_R_LOCAL_HIGH 0x05
-#define LM90_REG_W_LOCAL_HIGH 0x0B
-#define LM90_REG_R_LOCAL_LOW 0x06
-#define LM90_REG_W_LOCAL_LOW 0x0C
-#define LM90_REG_R_LOCAL_CRIT 0x20
-#define LM90_REG_W_LOCAL_CRIT 0x20
-#define LM90_REG_R_REMOTE_TEMPH 0x01
-#define LM90_REG_R_REMOTE_TEMPL 0x10
-#define LM90_REG_R_REMOTE_OFFSH 0x11
-#define LM90_REG_W_REMOTE_OFFSH 0x11
-#define LM90_REG_R_REMOTE_OFFSL 0x12
-#define LM90_REG_W_REMOTE_OFFSL 0x12
-#define LM90_REG_R_REMOTE_HIGHH 0x07
-#define LM90_REG_W_REMOTE_HIGHH 0x0D
-#define LM90_REG_R_REMOTE_HIGHL 0x13
-#define LM90_REG_W_REMOTE_HIGHL 0x13
-#define LM90_REG_R_REMOTE_LOWH 0x08
-#define LM90_REG_W_REMOTE_LOWH 0x0E
-#define LM90_REG_R_REMOTE_LOWL 0x14
-#define LM90_REG_W_REMOTE_LOWL 0x14
-#define LM90_REG_R_REMOTE_CRIT 0x19
-#define LM90_REG_W_REMOTE_CRIT 0x19
-#define LM90_REG_R_TCRIT_HYST 0x21
-#define LM90_REG_W_TCRIT_HYST 0x21
-
-/*
- * Conversions and various macros
- * For local temperatures and limits, critical limits and the hysteresis
- * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
- * For remote temperatures and limits, it uses signed 11-bit values with
- * LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
- */
-
-#define TEMP1_FROM_REG(val) ((val) * 1000)
-#define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \
- (val) >= 127000 ? 127 : \
- (val) < 0 ? ((val) - 500) / 1000 : \
- ((val) + 500) / 1000)
-#define TEMP2_FROM_REG(val) ((val) / 32 * 125)
-#define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
- (val) >= 127875 ? 0x7FE0 : \
- (val) < 0 ? ((val) - 62) / 125 * 32 : \
- ((val) + 62) / 125 * 32)
-#define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
- ((val) + 500) / 1000)
-
-/*
- * ADT7461 is almost identical to LM90 except that attempts to write
- * values that are outside the range 0 < temp < 127 are treated as
- * the boundary value.
- */
-
-#define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
- (val) >= 127000 ? 127 : \
- ((val) + 500) / 1000)
-#define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
- (val) >= 127750 ? 0x7FC0 : \
- ((val) + 125) / 250 * 64)
-
-/*
- * Functions declaration
- */
-
-static int lm90_attach_adapter(struct i2c_adapter *adapter);
-static int lm90_detect(struct i2c_adapter *adapter, int address,
- int kind);
-static void lm90_init_client(struct i2c_client *client);
-static int lm90_detach_client(struct i2c_client *client);
-static struct lm90_data *lm90_update_device(struct device *dev);
-
-/*
- * Driver data (common to all clients)
- */
-
-static struct i2c_driver lm90_driver = {
- .owner = THIS_MODULE,
- .name = "lm90",
- .id = I2C_DRIVERID_LM90,
- .flags = I2C_DF_NOTIFY,
- .attach_adapter = lm90_attach_adapter,
- .detach_client = lm90_detach_client,
-};
-
-/*
- * Client data (each client gets its own)
- */
-
-struct lm90_data {
- struct i2c_client client;
- struct semaphore update_lock;
- char valid; /* zero until following fields are valid */
- unsigned long last_updated; /* in jiffies */
- int kind;
-
- /* registers values */
- s8 temp8[5]; /* 0: local input
- 1: local low limit
- 2: local high limit
- 3: local critical limit
- 4: remote critical limit */
- s16 temp11[3]; /* 0: remote input
- 1: remote low limit
- 2: remote high limit */
- u8 temp_hyst;
- u8 alarms; /* bitvector */
-};
-
-/*
- * Sysfs stuff
- */
-
-static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
- char *buf)
-{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- struct lm90_data *data = lm90_update_device(dev);
- return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]));
-}
-
-static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- static const u8 reg[4] = {
- LM90_REG_W_LOCAL_LOW,
- LM90_REG_W_LOCAL_HIGH,
- LM90_REG_W_LOCAL_CRIT,
- LM90_REG_W_REMOTE_CRIT,
- };
-
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- struct i2c_client *client = to_i2c_client(dev);
- struct lm90_data *data = i2c_get_clientdata(client);
- long val = simple_strtol(buf, NULL, 10);
- int nr = attr->index;
-
- down(&data->update_lock);
- if (data->kind == adt7461)
- data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
- else
- data->temp8[nr] = TEMP1_TO_REG(val);
- i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
- up(&data->update_lock);
- return count;
-}
-
-static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
- char *buf)
-{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- struct lm90_data *data = lm90_update_device(dev);
- return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index]));
-}
-
-static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
- const char *buf, size_t count)
-{
- static const u8 reg[4] = {
- LM90_REG_W_REMOTE_LOWH,
- LM90_REG_W_REMOTE_LOWL,
- LM90_REG_W_REMOTE_HIGHH,
- LM90_REG_W_REMOTE_HIGHL,
- };
-
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- struct i2c_client *client = to_i2c_client(dev);
- struct lm90_data *data = i2c_get_clientdata(client);
- long val = simple_strtol(buf, NULL, 10);
- int nr = attr->index;
-
- down(&data->update_lock);
- if (data->kind == adt7461)
- data->temp11[nr] = TEMP2_TO_REG_ADT7461(val);
- else
- data->temp11[nr] = TEMP2_TO_REG(val);
- i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
- data->temp11[nr] >> 8);
- i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
- data->temp11[nr] & 0xff);
- up(&data->update_lock);
- return count;
-}
-
-static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr,
- char *buf)
-{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- struct lm90_data *data = lm90_update_device(dev);
- return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])
- - TEMP1_FROM_REG(data->temp_hyst));
-}
-
-static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
- const char *buf, size_t count)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm90_data *data = i2c_get_clientdata(client);
- long val = simple_strtol(buf, NULL, 10);
- long hyst;
-
- down(&data->update_lock);
- hyst = TEMP1_FROM_REG(data->temp8[3]) - val;
- i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
- HYST_TO_REG(hyst));
- up(&data->update_lock);
- return count;
-}
-
-static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
- char *buf)
-{
- struct lm90_data *data = lm90_update_device(dev);
- return sprintf(buf, "%d\n", data->alarms);
-}
-
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
-static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
-static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
- set_temp8, 1);
-static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
- set_temp11, 1);
-static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
- set_temp8, 2);
-static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
- set_temp11, 2);
-static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
- set_temp8, 3);
-static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
- set_temp8, 4);
-static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
- set_temphyst, 3);
-static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
-static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
-
-/*
- * Real code
- */
-
-static int lm90_attach_adapter(struct i2c_adapter *adapter)
-{
- if (!(adapter->class & I2C_CLASS_HWMON))
- return 0;
- return i2c_detect(adapter, &addr_data, lm90_detect);
-}
-
-/*
- * The following function does more than just detection. If detection
- * succeeds, it also registers the new chip.
- */
-static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
-{
- struct i2c_client *new_client;
- struct lm90_data *data;
- int err = 0;
- const char *name = "";
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
- goto exit;
-
- if (!(data = kmalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
- memset(data, 0, sizeof(struct lm90_data));
-
- /* The common I2C client data is placed right before the
- LM90-specific data. */
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &lm90_driver;
- new_client->flags = 0;
-
- /*
- * Now we do the remaining detection. A negative kind means that
- * the driver was loaded with no force parameter (default), so we
- * must both detect and identify the chip. A zero kind means that
- * the driver was loaded with the force parameter, the detection
- * step shall be skipped. A positive kind means that the driver
- * was loaded with the force parameter and a given kind of chip is
- * requested, so both the detection and the identification steps
- * are skipped.
- */
-
- /* Default to an LM90 if forced */
- if (kind == 0)
- kind = lm90;
-
- if (kind < 0) { /* detection and identification */
- u8 man_id, chip_id, reg_config1, reg_convrate;
-
- man_id = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_MAN_ID);
- chip_id = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CHIP_ID);
- reg_config1 = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONFIG1);
- reg_convrate = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONVRATE);
-
- if (man_id == 0x01) { /* National Semiconductor */
- u8 reg_config2;
-
- reg_config2 = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONFIG2);
-
- if ((reg_config1 & 0x2A) == 0x00
- && (reg_config2 & 0xF8) == 0x00
- && reg_convrate <= 0x09) {
- if (address == 0x4C
- && (chip_id & 0xF0) == 0x20) { /* LM90 */
- kind = lm90;
- } else
- if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
- kind = lm99;
- } else
- if (address == 0x4C
- && (chip_id & 0xF0) == 0x10) { /* LM86 */
- kind = lm86;
- }
- }
- } else
- if (man_id == 0x41) { /* Analog Devices */
- if (address == 0x4C
- && (chip_id & 0xF0) == 0x40 /* ADM1032 */
- && (reg_config1 & 0x3F) == 0x00
- && reg_convrate <= 0x0A) {
- kind = adm1032;
- } else
- if (address == 0x4c
- && chip_id == 0x51 /* ADT7461 */
- && (reg_config1 & 0x1F) == 0x00 /* check compat mode */
- && reg_convrate <= 0x0A) {
- kind = adt7461;
- }
- } else
- if (man_id == 0x4D) { /* Maxim */
- /*
- * The Maxim variants do NOT have a chip_id register.
- * Reading from that address will return the last read
- * value, which in our case is those of the man_id
- * register. Likewise, the config1 register seems to
- * lack a low nibble, so the value will be those of the
- * previous read, so in our case those of the man_id
- * register.
- */
- if (chip_id == man_id
- && (reg_config1 & 0x1F) == (man_id & 0x0F)
- && reg_convrate <= 0x09) {
- kind = max6657;
- }
- }
-
- if (kind <= 0) { /* identification failed */
- dev_info(&adapter->dev,
- "Unsupported chip (man_id=0x%02X, "
- "chip_id=0x%02X).\n", man_id, chip_id);
- goto exit_free;
- }
- }
-
- if (kind == lm90) {
- name = "lm90";
- } else if (kind == adm1032) {
- name = "adm1032";
- } else if (kind == lm99) {
- name = "lm99";
- } else if (kind == lm86) {
- name = "lm86";
- } else if (kind == max6657) {
- name = "max6657";
- } else if (kind == adt7461) {
- name = "adt7461";
- }
-
- /* We can fill in the remaining client fields */
- strlcpy(new_client->name, name, I2C_NAME_SIZE);
- data->valid = 0;
- data->kind = kind;
- init_MUTEX(&data->update_lock);
-
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(new_client)))
- goto exit_free;
-
- /* Initialize the LM90 chip */
- lm90_init_client(new_client);
-
- /* Register sysfs hooks */
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_input.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_input.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_min.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_min.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_max.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_max.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_crit.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_crit.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_crit_hyst.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_crit_hyst.dev_attr);
- device_create_file(&new_client->dev, &dev_attr_alarms);
-
- return 0;
-
-exit_free:
- kfree(data);
-exit:
- return err;
-}
-
-static void lm90_init_client(struct i2c_client *client)
-{
- u8 config;
-
- /*
- * Start the conversions.
- */
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
- 5); /* 2 Hz */
- config = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
- if (config & 0x40)
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
- config & 0xBF); /* run */
-}
-
-static int lm90_detach_client(struct i2c_client *client)
-{
- int err;
-
- if ((err = i2c_detach_client(client))) {
- dev_err(&client->dev, "Client deregistration failed, "
- "client not detached.\n");
- return err;
- }
-
- kfree(i2c_get_clientdata(client));
- return 0;
-}
-
-static struct lm90_data *lm90_update_device(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm90_data *data = i2c_get_clientdata(client);
-
- down(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
- u8 oldh, newh;
-
- dev_dbg(&client->dev, "Updating lm90 data.\n");
- data->temp8[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_TEMP);
- data->temp8[1] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_LOW);
- data->temp8[2] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_HIGH);
- data->temp8[3] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_CRIT);
- data->temp8[4] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_CRIT);
- data->temp_hyst = i2c_smbus_read_byte_data(client,
- LM90_REG_R_TCRIT_HYST);
-
- /*
- * There is a trick here. We have to read two registers to
- * have the remote sensor temperature, but we have to beware
- * a conversion could occur inbetween the readings. The
- * datasheet says we should either use the one-shot
- * conversion register, which we don't want to do (disables
- * hardware monitoring) or monitor the busy bit, which is
- * impossible (we can't read the values and monitor that bit
- * at the exact same time). So the solution used here is to
- * read the high byte once, then the low byte, then the high
- * byte again. If the new high byte matches the old one,
- * then we have a valid reading. Else we have to read the low
- * byte again, and now we believe we have a correct reading.
- */
- oldh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- data->temp11[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPL);
- newh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- if (newh != oldh) {
- data->temp11[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPL);
-#ifdef DEBUG
- oldh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- /* oldh is actually newer */
- if (newh != oldh)
- dev_warn(&client->dev, "Remote temperature may be "
- "wrong.\n");
-#endif
- }
- data->temp11[0] |= (newh << 8);
-
- data->temp11[1] = (i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_LOWH) << 8) +
- i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_LOWL);
- data->temp11[2] = (i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_HIGHH) << 8) +
- i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_HIGHL);
- data->alarms = i2c_smbus_read_byte_data(client,
- LM90_REG_R_STATUS);
-
- data->last_updated = jiffies;
- data->valid = 1;
- }
-
- up(&data->update_lock);
-
- return data;
-}
-
-static int __init sensors_lm90_init(void)
-{
- return i2c_add_driver(&lm90_driver);
-}
-
-static void __exit sensors_lm90_exit(void)
-{
- i2c_del_driver(&lm90_driver);
-}
-
-MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
-MODULE_DESCRIPTION("LM90/ADM1032 driver");
-MODULE_LICENSE("GPL");
-
-module_init(sensors_lm90_init);
-module_exit(sensors_lm90_exit);