diff options
Diffstat (limited to 'drivers/i2c/chips/pcf8575.c')
| -rw-r--r-- | drivers/i2c/chips/pcf8575.c | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/drivers/i2c/chips/pcf8575.c b/drivers/i2c/chips/pcf8575.c deleted file mode 100644 index 3ea08ac0bfa..00000000000 --- a/drivers/i2c/chips/pcf8575.c +++ /dev/null @@ -1,214 +0,0 @@ -/* - pcf8575.c - - About the PCF8575 chip: the PCF8575 is a 16-bit I/O expander for the I2C bus - produced by a.o. Philips Semiconductors. - - Copyright (C) 2006 Michael Hennerich, Analog Devices Inc. - <hennerich@blackfin.uclinux.org> - Based on pcf8574.c. - - Copyright (c) 2007 Bart Van Assche <bart.vanassche@gmail.com>. - Ported this driver from ucLinux to the mainstream Linux kernel. - - 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/i2c.h> -#include <linux/slab.h> /* kzalloc() */ -#include <linux/sysfs.h> /* sysfs_create_group() */ - -/* Addresses to scan */ -static const unsigned short normal_i2c[] = { - 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, - I2C_CLIENT_END -}; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD; - - -/* Each client has this additional data */ -struct pcf8575_data { - struct i2c_client client; - int write; /* last written value, or error code */ -}; - -static int pcf8575_attach_adapter(struct i2c_adapter *adapter); -static int pcf8575_detect(struct i2c_adapter *adapter, int address, int kind); -static int pcf8575_detach_client(struct i2c_client *client); - -/* This is the driver that will be inserted */ -static struct i2c_driver pcf8575_driver = { - .driver = { - .owner = THIS_MODULE, - .name = "pcf8575", - }, - .attach_adapter = pcf8575_attach_adapter, - .detach_client = pcf8575_detach_client, -}; - -/* following are the sysfs callback functions */ -static ssize_t show_read(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct i2c_client *client = to_i2c_client(dev); - u16 val; - u8 iopin_state[2]; - - i2c_master_recv(client, iopin_state, 2); - - val = iopin_state[0]; - val |= iopin_state[1] << 8; - - return sprintf(buf, "%u\n", val); -} - -static DEVICE_ATTR(read, S_IRUGO, show_read, NULL); - -static ssize_t show_write(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct pcf8575_data *data = dev_get_drvdata(dev); - if (data->write < 0) - return data->write; - return sprintf(buf, "%d\n", data->write); -} - -static ssize_t set_write(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count) -{ - struct i2c_client *client = to_i2c_client(dev); - struct pcf8575_data *data = i2c_get_clientdata(client); - unsigned long val = simple_strtoul(buf, NULL, 10); - u8 iopin_state[2]; - - if (val > 0xffff) - return -EINVAL; - - data->write = val; - - iopin_state[0] = val & 0xFF; - iopin_state[1] = val >> 8; - - i2c_master_send(client, iopin_state, 2); - - return count; -} - -static DEVICE_ATTR(write, S_IWUSR | S_IRUGO, show_write, set_write); - -static struct attribute *pcf8575_attributes[] = { - &dev_attr_read.attr, - &dev_attr_write.attr, - NULL -}; - -static const struct attribute_group pcf8575_attr_group = { - .attrs = pcf8575_attributes, -}; - -/* - * Real code - */ - -static int pcf8575_attach_adapter(struct i2c_adapter *adapter) -{ - return i2c_probe(adapter, &addr_data, pcf8575_detect); -} - -/* This function is called by i2c_probe */ -static int pcf8575_detect(struct i2c_adapter *adapter, int address, int kind) -{ - struct i2c_client *client; - struct pcf8575_data *data; - int err = 0; - - if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) - goto exit; - - /* OK. For now, we presume we have a valid client. We now create the - client structure, even though we cannot fill it completely yet. */ - data = kzalloc(sizeof(struct pcf8575_data), GFP_KERNEL); - if (!data) { - err = -ENOMEM; - goto exit; - } - - client = &data->client; - i2c_set_clientdata(client, data); - client->addr = address; - client->adapter = adapter; - client->driver = &pcf8575_driver; - strlcpy(client->name, "pcf8575", I2C_NAME_SIZE); - data->write = -EAGAIN; - - /* This is the place to detect whether the chip at the specified - address really is a PCF8575 chip. However, there is no method known - to detect whether an I2C chip is a PCF8575 or any other I2C chip. */ - - /* Tell the I2C layer a new client has arrived */ - err = i2c_attach_client(client); - if (err) - goto exit_free; - - /* Register sysfs hooks */ - err = sysfs_create_group(&client->dev.kobj, &pcf8575_attr_group); - if (err) - goto exit_detach; - - return 0; - -exit_detach: - i2c_detach_client(client); -exit_free: - kfree(data); -exit: - return err; -} - -static int pcf8575_detach_client(struct i2c_client *client) -{ - int err; - - sysfs_remove_group(&client->dev.kobj, &pcf8575_attr_group); - - err = i2c_detach_client(client); - if (err) - return err; - - kfree(i2c_get_clientdata(client)); - return 0; -} - -static int __init pcf8575_init(void) -{ - return i2c_add_driver(&pcf8575_driver); -} - -static void __exit pcf8575_exit(void) -{ - i2c_del_driver(&pcf8575_driver); -} - -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>, " - "Bart Van Assche <bart.vanassche@gmail.com>"); -MODULE_DESCRIPTION("pcf8575 driver"); -MODULE_LICENSE("GPL"); - -module_init(pcf8575_init); -module_exit(pcf8575_exit); |