diff options
Diffstat (limited to 'drivers/i2c/chips/pcf8575.c')
| -rw-r--r-- | drivers/i2c/chips/pcf8575.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/i2c/chips/pcf8575.c b/drivers/i2c/chips/pcf8575.c new file mode 100644 index 0000000..07fd7cb --- /dev/null +++ b/drivers/i2c/chips/pcf8575.c @@ -0,0 +1,198 @@ +/* + 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: none, device can't be detected */ +static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; + +/* Insmod parameters */ +I2C_CLIENT_INSMOD; + + +/* Each client has this additional data */ +struct pcf8575_data { + int write; /* last written value, or error code */ +}; + +/* 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 + */ + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int pcf8575_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_I2C)) + return -ENODEV; + + /* 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. */ + + strlcpy(info->type, "pcf8575", I2C_NAME_SIZE); + + return 0; +} + +static int pcf8575_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct pcf8575_data *data; + int err; + + data = kzalloc(sizeof(struct pcf8575_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + + i2c_set_clientdata(client, data); + data->write = -EAGAIN; + + /* Register sysfs hooks */ + err = sysfs_create_group(&client->dev.kobj, &pcf8575_attr_group); + if (err) + goto exit_free; + + return 0; + +exit_free: + kfree(data); +exit: + return err; +} + +static int pcf8575_remove(struct i2c_client *client) +{ + sysfs_remove_group(&client->dev.kobj, &pcf8575_attr_group); + kfree(i2c_get_clientdata(client)); + return 0; +} + +static const struct i2c_device_id pcf8575_id[] = { + { "pcf8575", 0 }, + { } +}; + +static struct i2c_driver pcf8575_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "pcf8575", + }, + .probe = pcf8575_probe, + .remove = pcf8575_remove, + .id_table = pcf8575_id, + + .detect = pcf8575_detect, + .address_data = &addr_data, +}; + +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); |
