+++ /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);
git.openpandora.org / pandora-kernel.git / blobdiff