From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bryan Wu Subject: [PATCH 2/2] [I2C] add PCA9543 chip driver Date: Mon, 12 May 2008 18:07:27 +0800 Message-ID: <1210586847-8955-3-git-send-email-cooloney@kernel.org> References: <1210586847-8955-1-git-send-email-cooloney@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1210586847-8955-1-git-send-email-cooloney-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: i2c-bounces-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org Errors-To: i2c-bounces-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org To: i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org, khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org Cc: Michael Hennerich List-Id: linux-i2c@vger.kernel.org From: Michael Hennerich Signed-off-by: Michael Hennerich Signed-off-by: Bryan Wu --- drivers/i2c/chips/Kconfig | 13 +++ drivers/i2c/chips/Makefile | 1 + drivers/i2c/chips/pca9543.c | 212 +++++++++++++++++++++++++++++++++++++++++++ include/linux/i2c-id.h | 1 + 4 files changed, 227 insertions(+), 0 deletions(-) create mode 100644 drivers/i2c/chips/pca9543.c diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index 1222e36..908fe9a 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -60,6 +60,19 @@ config PCF8575 This device is hard to detect and is rarely found on mainstream hardware. If unsure, say N. +config SENSORS_PCA9543 + tristate "Philips PCA9543 bi-directional translating switch" + depends on I2C && EXPERIMENTAL + default n + help + If you say yes here you get support for Philips PCA9543. + + This driver can also be built as a module. If so, the module + will be called pca9543. + + These devices are hard to detect and rarely found on mainstream + hardware. If unsure, say N. + config SENSORS_PCA9539 tristate "Philips PCA9539 16-bit I/O port (DEPRECATED)" depends on EXPERIMENTAL && GPIO_PCA9539 = "n" diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index 866def2..7b292e6 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_DS1682) += ds1682.o obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o obj-$(CONFIG_SENSORS_MAX6875) += max6875.o obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o +obj-$(CONFIG_SENSORS_PCA9543) += pca9543.o obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o obj-$(CONFIG_PCF8575) += pcf8575.o obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o diff --git a/drivers/i2c/chips/pca9543.c b/drivers/i2c/chips/pca9543.c new file mode 100644 index 0000000..dc19638 --- /dev/null +++ b/drivers/i2c/chips/pca9543.c @@ -0,0 +1,212 @@ +/* + pca9543.c - Part of lm_sensors, Linux kernel modules for hardware + monitoring + Copyright (c) 2000 Frodo Looijaard , + Philip Edelbrock , + Dan Eaton + Ported to Linux 2.6 by Aurelien Jarno with + the help of Jean Delvare + + Copyright (C) 2007 Michael Hennerich, Analog Devices Inc. + + based on the pcf8574.c + + 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. +*/ + +/* A few notes about the PCA9543: + +* The PCA9543 is a bi-directional translating switch, controlled by the + I2C bus. The SCL/SDA upstream pair fans out to two downstream + pairs, or channels. Any individual SCx/SDx channels or combination + of channels can be selected, determined by the contents of the + programmable control register. Two interrupt inputs, INT0 to INT3, + one for each of the downstream pairs, are provided. One interrupt + output INT, which acts as an AND of the two interrupt inputs, is + provided. + +*/ + +#include +#include +#include +#include + +/* Addresses to scan */ +static unsigned short normal_i2c[] = { 0x70,0x71, 0x72, 0x73, I2C_CLIENT_END }; + +/* Insmod parameters */ +I2C_CLIENT_INSMOD_1(pca9543); + + +/* Each client has this additional data */ +struct pca9543_data { + struct i2c_client client; + + u8 write; /* Remember last written value */ +}; + +static int pca9543_attach_adapter(struct i2c_adapter *adapter); +static int pca9543_detect(struct i2c_adapter *adapter, int address, int kind); +static int pca9543_detach_client(struct i2c_client *client); + + +/* This is the driver that will be inserted */ +static struct i2c_driver pca9543_driver = { + .driver = { + .name = "pca9543", + }, + .id = I2C_DRIVERID_PCF8574, + .attach_adapter = pca9543_attach_adapter, + .detach_client = pca9543_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); + return sprintf(buf, "%u\n", i2c_smbus_read_byte(client)); +} + +static DEVICE_ATTR(read, S_IRUGO, show_read, NULL); + +static ssize_t show_write(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct pca9543_data *data = i2c_get_clientdata(to_i2c_client(dev)); + return sprintf(buf, "%u\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 pca9543_data *data = i2c_get_clientdata(client); + unsigned long val = simple_strtoul(buf, NULL, 10); + + if (val > 0xff) + return -EINVAL; + + data->write = val; + i2c_smbus_write_byte(client, data->write); + return count; +} + +static DEVICE_ATTR(write, S_IWUSR | S_IRUGO, show_write, set_write); + +static struct attribute *pca9543_attributes[] = { + &dev_attr_read.attr, + &dev_attr_write.attr, + NULL +}; + +static const struct attribute_group pca9543_attr_group = { + .attrs = pca9543_attributes, +}; + +/* + * Real code + */ + +static int pca9543_attach_adapter(struct i2c_adapter *adapter) +{ + return i2c_probe(adapter, &addr_data, pca9543_detect); +} + +/* This function is called by i2c_probe */ +static int pca9543_detect(struct i2c_adapter *adapter, int address, int kind) +{ + struct i2c_client *new_client; + struct pca9543_data *data; + int err = 0; + const char *client_name = "pca9543"; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) + 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. */ + if (!(data = kzalloc(sizeof(struct pca9543_data), GFP_KERNEL))) { + err = -ENOMEM; + goto exit; + } + + new_client = &data->client; + i2c_set_clientdata(new_client, data); + new_client->addr = address; + new_client->adapter = adapter; + new_client->driver = &pca9543_driver; + new_client->flags = 0; + + /* Now, we would do the remaining detection. But the PCF8574 is plainly + impossible to detect! Stupid chip. */ + + /* Fill in the remaining client fields and put it into the global list */ + strlcpy(new_client->name, client_name, I2C_NAME_SIZE); + + /* Tell the I2C layer a new client has arrived */ + if ((err = i2c_attach_client(new_client))) + goto exit_free; + + + /* Register sysfs hooks */ + err = sysfs_create_group(&new_client->dev.kobj, &pca9543_attr_group); + if (err) + goto exit_detach; + return 0; + + exit_detach: + i2c_detach_client(new_client); + exit_free: + kfree(data); + exit: + return err; +} + +static int pca9543_detach_client(struct i2c_client *client) +{ + int err; + + sysfs_remove_group(&client->dev.kobj, &pca9543_attr_group); + + if ((err = i2c_detach_client(client))) + return err; + + kfree(i2c_get_clientdata(client)); + return 0; +} + + +static int __init pca9543_init(void) +{ + return i2c_add_driver(&pca9543_driver); +} + +static void __exit pca9543_exit(void) +{ + i2c_del_driver(&pca9543_driver); +} + + +MODULE_AUTHOR + ("Frodo Looijaard , " + "Philip Edelbrock , " + "Dan Eaton " + "and Aurelien Jarno " + "Michael Hennerich "); +MODULE_DESCRIPTION("PCA9543 driver"); +MODULE_LICENSE("GPL"); + +module_init(pca9543_init); +module_exit(pca9543_exit); diff --git a/include/linux/i2c-id.h b/include/linux/i2c-id.h index adfcf71..72c246a 100644 --- a/include/linux/i2c-id.h +++ b/include/linux/i2c-id.h @@ -95,6 +95,7 @@ #define I2C_DRIVERID_OV7670 1048 /* Omnivision 7670 camera */ #define I2C_DRIVERID_AD5252 1049 +#define I2C_DRIVERID_PCF8575 1050 /* * ---- Adapter types ---------------------------------------------------- -- 1.5.5 _______________________________________________ i2c mailing list i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org http://lists.lm-sensors.org/mailman/listinfo/i2c