diff options
author | Jean Delvare <khali@linux-fr.org> | 2009-03-30 21:46:43 +0200 |
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committer | Jean Delvare <khali@linux-fr.org> | 2009-03-30 21:46:43 +0200 |
commit | fb4504fe84b09cbf49fda19e6630a1003d79656a (patch) | |
tree | d2e623b65fb91f18a02b3435f5a25e8b36572815 /drivers/i2c/chips/pcf8591.c | |
parent | a157d06d4d70318a0818552095071d7430dd5d34 (diff) |
Move the pcf8591 driver to hwmon
Directory drivers/i2c/chips is going away, so drivers there must find
new homes. For the pcf8591 driver, the best choice seems to be the
hwmon subsystem. While the Philips PCF8591 device isn't a typical
hardware monitoring chip, its DAC interface is compatible with the
hwmon one, so it fits somewhat.
If a better subsystem is ever created for ADC/DAC chips, the driver
could be moved there.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'drivers/i2c/chips/pcf8591.c')
-rw-r--r-- | drivers/i2c/chips/pcf8591.c | 325 |
1 files changed, 0 insertions, 325 deletions
diff --git a/drivers/i2c/chips/pcf8591.c b/drivers/i2c/chips/pcf8591.c deleted file mode 100644 index 16ce3e19377..00000000000 --- a/drivers/i2c/chips/pcf8591.c +++ /dev/null @@ -1,325 +0,0 @@ -/* - 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); |