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Diffstat (limited to 'drivers/hwmon/pcf8591.c')
-rw-r--r--drivers/hwmon/pcf8591.c143
1 files changed, 87 insertions, 56 deletions
diff --git a/drivers/hwmon/pcf8591.c b/drivers/hwmon/pcf8591.c
index 731b09af76b9..4174c7463d70 100644
--- a/drivers/hwmon/pcf8591.c
+++ b/drivers/hwmon/pcf8591.c
@@ -1,22 +1,22 @@
/*
- Copyright (C) 2001-2004 Aurelien Jarno <aurelien@aurel32.net>
- Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
- the help of Jean Delvare <khali@linux-fr.org>
-
- 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.
-*/
+ * Copyright (C) 2001-2004 Aurelien Jarno <aurelien@aurel32.net>
+ * Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
+ * the help of Jean Delvare <khali@linux-fr.org>
+ *
+ * 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.
+ */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -39,28 +39,34 @@ MODULE_PARM_DESC(input_mode,
" 2 = single ended and differential mixed\n"
" 3 = two differential inputs\n");
-/* The PCF8591 control byte
- 7 6 5 4 3 2 1 0
- | 0 |AOEF| AIP | 0 |AINC| AICH | */
+/*
+ * The PCF8591 control byte
+ * 7 6 5 4 3 2 1 0
+ * | 0 |AOEF| AIP | 0 |AINC| AICH |
+ */
/* Analog Output Enable Flag (analog output active if 1) */
#define PCF8591_CONTROL_AOEF 0x40
-/* Analog Input Programming
- 0x00 = four single ended inputs
- 0x10 = three differential inputs
- 0x20 = single ended and differential mixed
- 0x30 = two differential inputs */
+/*
+ * Analog Input Programming
+ * 0x00 = four single ended inputs
+ * 0x10 = three differential inputs
+ * 0x20 = single ended and differential mixed
+ * 0x30 = two differential inputs
+ */
#define PCF8591_CONTROL_AIP_MASK 0x30
/* Autoincrement Flag (switch on if 1) */
#define PCF8591_CONTROL_AINC 0x04
-/* Channel selection
- 0x00 = channel 0
- 0x01 = channel 1
- 0x02 = channel 2
- 0x03 = channel 3 */
+/*
+ * Channel selection
+ * 0x00 = channel 0
+ * 0x01 = channel 1
+ * 0x02 = channel 2
+ * 0x03 = channel 3
+ */
#define PCF8591_CONTROL_AICH_MASK 0x03
/* Initial values */
@@ -68,7 +74,7 @@ MODULE_PARM_DESC(input_mode,
#define PCF8591_INIT_AOUT 0 /* DAC out = 0 */
/* Conversions */
-#define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg))
+#define REG_TO_SIGNED(reg) (((reg) & 0x80) ? ((reg) - 256) : (reg))
struct pcf8591_data {
struct device *hwmon_dev;
@@ -83,7 +89,9 @@ static int pcf8591_read_channel(struct device *dev, int channel);
/* following are the sysfs callback functions */
#define show_in_channel(channel) \
-static ssize_t show_in##channel##_input(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_in##channel##_input(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
{ \
return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\
} \
@@ -95,39 +103,57 @@ show_in_channel(1);
show_in_channel(2);
show_in_channel(3);
-static ssize_t show_out0_ouput(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_out0_ouput(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));
return sprintf(buf, "%d\n", data->aout * 10);
}
-static ssize_t set_out0_output(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+static ssize_t set_out0_output(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
- unsigned int value;
+ unsigned long val;
struct i2c_client *client = to_i2c_client(dev);
struct pcf8591_data *data = i2c_get_clientdata(client);
- if ((value = (simple_strtoul(buf, NULL, 10) + 5) / 10) <= 255) {
- data->aout = value;
- i2c_smbus_write_byte_data(client, data->control, data->aout);
- return count;
- }
- return -EINVAL;
+ int err;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+
+ val /= 10;
+ if (val > 255)
+ return -EINVAL;
+
+ data->aout = val;
+ i2c_smbus_write_byte_data(client, data->control, data->aout);
+ return count;
}
static DEVICE_ATTR(out0_output, S_IWUSR | S_IRUGO,
show_out0_ouput, set_out0_output);
-static ssize_t show_out0_enable(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_out0_enable(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));
return sprintf(buf, "%u\n", !(!(data->control & PCF8591_CONTROL_AOEF)));
}
-static ssize_t set_out0_enable(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+static ssize_t set_out0_enable(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct pcf8591_data *data = i2c_get_clientdata(client);
- unsigned long val = simple_strtoul(buf, NULL, 10);
+ unsigned long val;
+ int err;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
mutex_lock(&data->update_lock);
if (val)
@@ -174,7 +200,8 @@ static int pcf8591_probe(struct i2c_client *client,
struct pcf8591_data *data;
int err;
- if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
+ data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL);
+ if (!data) {
err = -ENOMEM;
goto exit;
}
@@ -192,15 +219,15 @@ static int pcf8591_probe(struct i2c_client *client,
/* Register input2 if not in "two differential inputs" mode */
if (input_mode != 3) {
- if ((err = device_create_file(&client->dev,
- &dev_attr_in2_input)))
+ err = device_create_file(&client->dev, &dev_attr_in2_input);
+ if (err)
goto exit_sysfs_remove;
}
/* Register input3 only in "four single ended inputs" mode */
if (input_mode == 0) {
- if ((err = device_create_file(&client->dev,
- &dev_attr_in3_input)))
+ err = device_create_file(&client->dev, &dev_attr_in3_input);
+ if (err)
goto exit_sysfs_remove;
}
@@ -241,8 +268,10 @@ static void pcf8591_init_client(struct i2c_client *client)
i2c_smbus_write_byte_data(client, data->control, data->aout);
- /* The first byte transmitted contains the conversion code of the
- previous read cycle. FLUSH IT! */
+ /*
+ * The first byte transmitted contains the conversion code of the
+ * previous read cycle. FLUSH IT!
+ */
i2c_smbus_read_byte(client);
}
@@ -259,8 +288,10 @@ static int pcf8591_read_channel(struct device *dev, int channel)
| channel;
i2c_smbus_write_byte(client, data->control);
- /* The first byte transmitted contains the conversion code of
- the previous read cycle. FLUSH IT! */
+ /*
+ * The first byte transmitted contains the conversion code of
+ * the previous read cycle. FLUSH IT!
+ */
i2c_smbus_read_byte(client);
}
value = i2c_smbus_read_byte(client);
@@ -269,9 +300,9 @@ static int pcf8591_read_channel(struct device *dev, int channel)
if ((channel == 2 && input_mode == 2) ||
(channel != 3 && (input_mode == 1 || input_mode == 3)))
- return (10 * REG_TO_SIGNED(value));
+ return 10 * REG_TO_SIGNED(value);
else
- return (10 * value);
+ return 10 * value;
}
static const struct i2c_device_id pcf8591_id[] = {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.