--- /dev/null
+Kernel driver pcf8591
+=====================
+
+Supported chips:
+ * Philips PCF8591
+ Prefix: 'pcf8591'
+ Addresses scanned: I2C 0x48 - 0x4f
+ Datasheet: Publicly available at the Philips Semiconductor website
+ http://www.semiconductors.philips.com/pip/PCF8591P.html
+
+Authors:
+ Aurelien Jarno <aurelien@aurel32.net>
+ valuable contributions by Jan M. Sendler <sendler@sendler.de>,
+ Jean Delvare <khali@linux-fr.org>
+
+
+Description
+-----------
+The PCF8591 is an 8-bit A/D and D/A converter (4 analog inputs and one
+analog output) for the I2C bus produced by Philips Semiconductors. It
+is designed to provide a byte I2C interface to up to 4 separate devices.
+
+The PCF8591 has 4 analog inputs programmable as single-ended or
+differential inputs :
+- mode 0 : four single ended inputs
+ Pins AIN0 to AIN3 are single ended inputs for channels 0 to 3
+
+- mode 1 : three differential inputs
+ Pins AIN3 is the common negative differential input
+ Pins AIN0 to AIN2 are positive differential inputs for channels 0 to 2
+
+- mode 2 : single ended and differential mixed
+ Pins AIN0 and AIN1 are single ended inputs for channels 0 and 1
+ Pins AIN2 is the positive differential input for channel 3
+ Pins AIN3 is the negative differential input for channel 3
+
+- mode 3 : two differential inputs
+ Pins AIN0 is the positive differential input for channel 0
+ Pins AIN1 is the negative differential input for channel 0
+ Pins AIN2 is the positive differential input for channel 1
+ Pins AIN3 is the negative differential input for channel 1
+
+See the datasheet for details.
+
+Module parameters
+-----------------
+
+* input_mode int
+
+ Analog input mode:
+ 0 = four single ended inputs
+ 1 = three differential inputs
+ 2 = single ended and differential mixed
+ 3 = two differential inputs
+
+
+Accessing PCF8591 via /sys interface
+-------------------------------------
+
+! Be careful !
+The PCF8591 is plainly impossible to detect ! Stupid chip.
+So every chip with address in the interval [48..4f] is
+detected as PCF8591. If you have other chips in this address
+range, the workaround is to load this module after the one
+for your others chips.
+
+On detection (i.e. insmod, modprobe et al.), directories are being
+created for each detected PCF8591:
+
+/sys/bus/devices/<0>-<1>/
+where <0> is the bus the chip was detected on (e. g. i2c-0)
+and <1> the chip address ([48..4f])
+
+Inside these directories, there are such files:
+in0, in1, in2, in3, out0_enable, out0_output, name
+
+Name contains chip name.
+
+The in0, in1, in2 and in3 files are RO. Reading gives the value of the
+corresponding channel. Depending on the current analog inputs configuration,
+files in2 and/or in3 do not exist. Values range are from 0 to 255 for single
+ended inputs and -128 to +127 for differential inputs (8-bit ADC).
+
+The out0_enable file is RW. Reading gives "1" for analog output enabled and
+"0" for analog output disabled. Writing accepts "0" and "1" accordingly.
+
+The out0_output file is RW. Writing a number between 0 and 255 (8-bit DAC), send
+the value to the digital-to-analog converter. Note that a voltage will
+only appears on AOUT pin if aout0_enable equals 1. Reading returns the last
+value written.
+++ /dev/null
-Kernel driver pcf8591
-=====================
-
-Supported chips:
- * Philips PCF8591
- Prefix: 'pcf8591'
- Addresses scanned: I2C 0x48 - 0x4f
- Datasheet: Publicly available at the Philips Semiconductor website
- http://www.semiconductors.philips.com/pip/PCF8591P.html
-
-Authors:
- Aurelien Jarno <aurelien@aurel32.net>
- valuable contributions by Jan M. Sendler <sendler@sendler.de>,
- Jean Delvare <khali@linux-fr.org>
-
-
-Description
------------
-The PCF8591 is an 8-bit A/D and D/A converter (4 analog inputs and one
-analog output) for the I2C bus produced by Philips Semiconductors. It
-is designed to provide a byte I2C interface to up to 4 separate devices.
-
-The PCF8591 has 4 analog inputs programmable as single-ended or
-differential inputs :
-- mode 0 : four single ended inputs
- Pins AIN0 to AIN3 are single ended inputs for channels 0 to 3
-
-- mode 1 : three differential inputs
- Pins AIN3 is the common negative differential input
- Pins AIN0 to AIN2 are positive differential inputs for channels 0 to 2
-
-- mode 2 : single ended and differential mixed
- Pins AIN0 and AIN1 are single ended inputs for channels 0 and 1
- Pins AIN2 is the positive differential input for channel 3
- Pins AIN3 is the negative differential input for channel 3
-
-- mode 3 : two differential inputs
- Pins AIN0 is the positive differential input for channel 0
- Pins AIN1 is the negative differential input for channel 0
- Pins AIN2 is the positive differential input for channel 1
- Pins AIN3 is the negative differential input for channel 1
-
-See the datasheet for details.
-
-Module parameters
------------------
-
-* input_mode int
-
- Analog input mode:
- 0 = four single ended inputs
- 1 = three differential inputs
- 2 = single ended and differential mixed
- 3 = two differential inputs
-
-
-Accessing PCF8591 via /sys interface
--------------------------------------
-
-! Be careful !
-The PCF8591 is plainly impossible to detect ! Stupid chip.
-So every chip with address in the interval [48..4f] is
-detected as PCF8591. If you have other chips in this address
-range, the workaround is to load this module after the one
-for your others chips.
-
-On detection (i.e. insmod, modprobe et al.), directories are being
-created for each detected PCF8591:
-
-/sys/bus/devices/<0>-<1>/
-where <0> is the bus the chip was detected on (e. g. i2c-0)
-and <1> the chip address ([48..4f])
-
-Inside these directories, there are such files:
-in0, in1, in2, in3, out0_enable, out0_output, name
-
-Name contains chip name.
-
-The in0, in1, in2 and in3 files are RO. Reading gives the value of the
-corresponding channel. Depending on the current analog inputs configuration,
-files in2 and/or in3 do not exist. Values range are from 0 to 255 for single
-ended inputs and -128 to +127 for differential inputs (8-bit ADC).
-
-The out0_enable file is RW. Reading gives "1" for analog output enabled and
-"0" for analog output disabled. Writing accepts "0" and "1" accordingly.
-
-The out0_output file is RW. Writing a number between 0 and 255 (8-bit DAC), send
-the value to the digital-to-analog converter. Note that a voltage will
-only appears on AOUT pin if aout0_enable equals 1. Reading returns the last
-value written.
This driver can also be built as a module. If so, the module
will be called pc87427.
+config SENSORS_PCF8591
+ tristate "Philips PCF8591 ADC/DAC"
+ depends on I2C
+ default n
+ help
+ If you say yes here you get support for Philips PCF8591 4-channel
+ ADC, 1-channel DAC chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called pcf8591.
+
+ These devices are hard to detect and rarely found on mainstream
+ hardware. If unsure, say N.
+
config SENSORS_SIS5595
tristate "Silicon Integrated Systems Corp. SiS5595"
depends on PCI
obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
+obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
--- /dev/null
+/*
+ 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.
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+
+/* Addresses to scan */
+static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
+ 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD_1(pcf8591);
+
+static int input_mode;
+module_param(input_mode, int, 0);
+MODULE_PARM_DESC(input_mode,
+ "Analog input mode:\n"
+ " 0 = four single ended inputs\n"
+ " 1 = three differential inputs\n"
+ " 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 | */
+
+/* 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 */
+#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 */
+#define PCF8591_CONTROL_AICH_MASK 0x03
+
+/* Initial values */
+#define PCF8591_INIT_CONTROL ((input_mode << 4) | PCF8591_CONTROL_AOEF)
+#define PCF8591_INIT_AOUT 0 /* DAC out = 0 */
+
+/* Conversions */
+#define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg))
+
+struct pcf8591_data {
+ struct mutex update_lock;
+
+ u8 control;
+ u8 aout;
+};
+
+static void pcf8591_init_client(struct i2c_client *client);
+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) \
+{ \
+ return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\
+} \
+static DEVICE_ATTR(in##channel##_input, S_IRUGO, \
+ show_in##channel##_input, NULL);
+
+show_in_channel(0);
+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)
+{
+ 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)
+{
+ unsigned int value;
+ 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;
+}
+
+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)
+{
+ 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)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pcf8591_data *data = i2c_get_clientdata(client);
+ unsigned long val = simple_strtoul(buf, NULL, 10);
+
+ mutex_lock(&data->update_lock);
+ if (val)
+ data->control |= PCF8591_CONTROL_AOEF;
+ else
+ data->control &= ~PCF8591_CONTROL_AOEF;
+ i2c_smbus_write_byte(client, data->control);
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static DEVICE_ATTR(out0_enable, S_IWUSR | S_IRUGO,
+ show_out0_enable, set_out0_enable);
+
+static struct attribute *pcf8591_attributes[] = {
+ &dev_attr_out0_enable.attr,
+ &dev_attr_out0_output.attr,
+ &dev_attr_in0_input.attr,
+ &dev_attr_in1_input.attr,
+ NULL
+};
+
+static const struct attribute_group pcf8591_attr_group = {
+ .attrs = pcf8591_attributes,
+};
+
+static struct attribute *pcf8591_attributes_opt[] = {
+ &dev_attr_in2_input.attr,
+ &dev_attr_in3_input.attr,
+ NULL
+};
+
+static const struct attribute_group pcf8591_attr_group_opt = {
+ .attrs = pcf8591_attributes_opt,
+};
+
+/*
+ * Real code
+ */
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int pcf8591_detect(struct i2c_client *client, int kind,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE
+ | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
+ return -ENODEV;
+
+ /* Now, we would do the remaining detection. But the PCF8591 is plainly
+ impossible to detect! Stupid chip. */
+
+ strlcpy(info->type, "pcf8591", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int pcf8591_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pcf8591_data *data;
+ int err;
+
+ if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ /* Initialize the PCF8591 chip */
+ pcf8591_init_client(client);
+
+ /* Register sysfs hooks */
+ err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group);
+ if (err)
+ goto exit_kfree;
+
+ /* Register input2 if not in "two differential inputs" mode */
+ if (input_mode != 3) {
+ if ((err = device_create_file(&client->dev,
+ &dev_attr_in2_input)))
+ 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)))
+ goto exit_sysfs_remove;
+ }
+
+ return 0;
+
+exit_sysfs_remove:
+ sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
+ sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
+exit_kfree:
+ kfree(data);
+exit:
+ return err;
+}
+
+static int pcf8591_remove(struct i2c_client *client)
+{
+ sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
+ sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
+ kfree(i2c_get_clientdata(client));
+ return 0;
+}
+
+/* Called when we have found a new PCF8591. */
+static void pcf8591_init_client(struct i2c_client *client)
+{
+ struct pcf8591_data *data = i2c_get_clientdata(client);
+ data->control = PCF8591_INIT_CONTROL;
+ data->aout = PCF8591_INIT_AOUT;
+
+ 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! */
+ i2c_smbus_read_byte(client);
+}
+
+static int pcf8591_read_channel(struct device *dev, int channel)
+{
+ u8 value;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pcf8591_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->update_lock);
+
+ if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) {
+ data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK)
+ | channel;
+ i2c_smbus_write_byte(client, data->control);
+
+ /* 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);
+
+ mutex_unlock(&data->update_lock);
+
+ if ((channel == 2 && input_mode == 2) ||
+ (channel != 3 && (input_mode == 1 || input_mode == 3)))
+ return (10 * REG_TO_SIGNED(value));
+ else
+ return (10 * value);
+}
+
+static const struct i2c_device_id pcf8591_id[] = {
+ { "pcf8591", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pcf8591_id);
+
+static struct i2c_driver pcf8591_driver = {
+ .driver = {
+ .name = "pcf8591",
+ },
+ .probe = pcf8591_probe,
+ .remove = pcf8591_remove,
+ .id_table = pcf8591_id,
+
+ .class = I2C_CLASS_HWMON, /* Nearest choice */
+ .detect = pcf8591_detect,
+ .address_data = &addr_data,
+};
+
+static int __init pcf8591_init(void)
+{
+ if (input_mode < 0 || input_mode > 3) {
+ printk(KERN_WARNING "pcf8591: invalid input_mode (%d)\n",
+ input_mode);
+ input_mode = 0;
+ }
+ return i2c_add_driver(&pcf8591_driver);
+}
+
+static void __exit pcf8591_exit(void)
+{
+ i2c_del_driver(&pcf8591_driver);
+}
+
+MODULE_AUTHOR("Aurelien Jarno <aurelien@aurel32.net>");
+MODULE_DESCRIPTION("PCF8591 driver");
+MODULE_LICENSE("GPL");
+
+module_init(pcf8591_init);
+module_exit(pcf8591_exit);
This driver is deprecated and will be dropped soon. Use
drivers/gpio/pca953x.c instead.
-config SENSORS_PCF8591
- tristate "Philips PCF8591"
- depends on EXPERIMENTAL
- default n
- help
- If you say yes here you get support for Philips PCF8591 chips.
-
- This driver can also be built as a module. If so, the module
- will be called pcf8591.
-
- These devices are hard to detect and rarely found on mainstream
- hardware. If unsure, say N.
-
config SENSORS_MAX6875
tristate "Maxim MAX6875 Power supply supervisor"
depends on EXPERIMENTAL
obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o
obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o
obj-$(CONFIG_PCF8575) += pcf8575.o
-obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
+++ /dev/null
-/*
- 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.
-*/
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/mutex.h>
-
-/* Addresses to scan */
-static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
- 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
-
-/* Insmod parameters */
-I2C_CLIENT_INSMOD_1(pcf8591);
-
-static int input_mode;
-module_param(input_mode, int, 0);
-MODULE_PARM_DESC(input_mode,
- "Analog input mode:\n"
- " 0 = four single ended inputs\n"
- " 1 = three differential inputs\n"
- " 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 | */
-
-/* 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 */
-#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 */
-#define PCF8591_CONTROL_AICH_MASK 0x03
-
-/* Initial values */
-#define PCF8591_INIT_CONTROL ((input_mode << 4) | PCF8591_CONTROL_AOEF)
-#define PCF8591_INIT_AOUT 0 /* DAC out = 0 */
-
-/* Conversions */
-#define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg))
-
-struct pcf8591_data {
- struct mutex update_lock;
-
- u8 control;
- u8 aout;
-};
-
-static void pcf8591_init_client(struct i2c_client *client);
-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) \
-{ \
- return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\
-} \
-static DEVICE_ATTR(in##channel##_input, S_IRUGO, \
- show_in##channel##_input, NULL);
-
-show_in_channel(0);
-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)
-{
- 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)
-{
- unsigned int value;
- 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;
-}
-
-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)
-{
- 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)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct pcf8591_data *data = i2c_get_clientdata(client);
- unsigned long val = simple_strtoul(buf, NULL, 10);
-
- mutex_lock(&data->update_lock);
- if (val)
- data->control |= PCF8591_CONTROL_AOEF;
- else
- data->control &= ~PCF8591_CONTROL_AOEF;
- i2c_smbus_write_byte(client, data->control);
- mutex_unlock(&data->update_lock);
- return count;
-}
-
-static DEVICE_ATTR(out0_enable, S_IWUSR | S_IRUGO,
- show_out0_enable, set_out0_enable);
-
-static struct attribute *pcf8591_attributes[] = {
- &dev_attr_out0_enable.attr,
- &dev_attr_out0_output.attr,
- &dev_attr_in0_input.attr,
- &dev_attr_in1_input.attr,
- NULL
-};
-
-static const struct attribute_group pcf8591_attr_group = {
- .attrs = pcf8591_attributes,
-};
-
-static struct attribute *pcf8591_attributes_opt[] = {
- &dev_attr_in2_input.attr,
- &dev_attr_in3_input.attr,
- NULL
-};
-
-static const struct attribute_group pcf8591_attr_group_opt = {
- .attrs = pcf8591_attributes_opt,
-};
-
-/*
- * Real code
- */
-
-/* Return 0 if detection is successful, -ENODEV otherwise */
-static int pcf8591_detect(struct i2c_client *client, int kind,
- struct i2c_board_info *info)
-{
- struct i2c_adapter *adapter = client->adapter;
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE
- | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
- return -ENODEV;
-
- /* Now, we would do the remaining detection. But the PCF8591 is plainly
- impossible to detect! Stupid chip. */
-
- strlcpy(info->type, "pcf8591", I2C_NAME_SIZE);
-
- return 0;
-}
-
-static int pcf8591_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct pcf8591_data *data;
- int err;
-
- if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
-
- i2c_set_clientdata(client, data);
- mutex_init(&data->update_lock);
-
- /* Initialize the PCF8591 chip */
- pcf8591_init_client(client);
-
- /* Register sysfs hooks */
- err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group);
- if (err)
- goto exit_kfree;
-
- /* Register input2 if not in "two differential inputs" mode */
- if (input_mode != 3) {
- if ((err = device_create_file(&client->dev,
- &dev_attr_in2_input)))
- 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)))
- goto exit_sysfs_remove;
- }
-
- return 0;
-
-exit_sysfs_remove:
- sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
- sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
-exit_kfree:
- kfree(data);
-exit:
- return err;
-}
-
-static int pcf8591_remove(struct i2c_client *client)
-{
- sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt);
- sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group);
- kfree(i2c_get_clientdata(client));
- return 0;
-}
-
-/* Called when we have found a new PCF8591. */
-static void pcf8591_init_client(struct i2c_client *client)
-{
- struct pcf8591_data *data = i2c_get_clientdata(client);
- data->control = PCF8591_INIT_CONTROL;
- data->aout = PCF8591_INIT_AOUT;
-
- 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! */
- i2c_smbus_read_byte(client);
-}
-
-static int pcf8591_read_channel(struct device *dev, int channel)
-{
- u8 value;
- struct i2c_client *client = to_i2c_client(dev);
- struct pcf8591_data *data = i2c_get_clientdata(client);
-
- mutex_lock(&data->update_lock);
-
- if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) {
- data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK)
- | channel;
- i2c_smbus_write_byte(client, data->control);
-
- /* 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);
-
- mutex_unlock(&data->update_lock);
-
- if ((channel == 2 && input_mode == 2) ||
- (channel != 3 && (input_mode == 1 || input_mode == 3)))
- return (10 * REG_TO_SIGNED(value));
- else
- return (10 * value);
-}
-
-static const struct i2c_device_id pcf8591_id[] = {
- { "pcf8591", 0 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, pcf8591_id);
-
-static struct i2c_driver pcf8591_driver = {
- .driver = {
- .name = "pcf8591",
- },
- .probe = pcf8591_probe,
- .remove = pcf8591_remove,
- .id_table = pcf8591_id,
-
- .class = I2C_CLASS_HWMON, /* Nearest choice */
- .detect = pcf8591_detect,
- .address_data = &addr_data,
-};
-
-static int __init pcf8591_init(void)
-{
- if (input_mode < 0 || input_mode > 3) {
- printk(KERN_WARNING "pcf8591: invalid input_mode (%d)\n",
- input_mode);
- input_mode = 0;
- }
- return i2c_add_driver(&pcf8591_driver);
-}
-
-static void __exit pcf8591_exit(void)
-{
- i2c_del_driver(&pcf8591_driver);
-}
-
-MODULE_AUTHOR("Aurelien Jarno <aurelien@aurel32.net>");
-MODULE_DESCRIPTION("PCF8591 driver");
-MODULE_LICENSE("GPL");
-
-module_init(pcf8591_init);
-module_exit(pcf8591_exit);
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff