From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bryan Wu Subject: [PATCH 1/2] [I2C]: add AD5252 chip driver Date: Mon, 12 May 2008 18:07:26 +0800 Message-ID: <1210586847-8955-2-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 | 7 ++ drivers/i2c/chips/Makefile | 1 + drivers/i2c/chips/ad5252.c | 252 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/i2c-id.h | 1 + 4 files changed, 261 insertions(+), 0 deletions(-) create mode 100644 drivers/i2c/chips/ad5252.c diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index 2da2edf..1222e36 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -14,6 +14,13 @@ config DS1682 This driver can also be built as a module. If so, the module will be called ds1682. +config SENSORS_AD5252 + tristate "Analog Devices AD5252 and AD5251 Digital Potentiometers" + depends on I2C && EXPERIMENTAL + help + If you say yes here you get support for Analog Devices and AD5252 + AD5251 chips. + config SENSORS_EEPROM tristate "EEPROM reader" depends on EXPERIMENTAL diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index e47aca0..866def2 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -9,6 +9,7 @@ # * I/O expander drivers go to drivers/gpio # +obj-$(CONFIG_SENSORS_AD5252) += ad5252.o obj-$(CONFIG_DS1682) += ds1682.o obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o obj-$(CONFIG_SENSORS_MAX6875) += max6875.o diff --git a/drivers/i2c/chips/ad5252.c b/drivers/i2c/chips/ad5252.c new file mode 100644 index 0000000..188795a --- /dev/null +++ b/drivers/i2c/chips/ad5252.c @@ -0,0 +1,252 @@ +/* + ad5252.c - Part of lm_sensors, Linux kernel modules for hardware + monitoring + + Driver for dual digitally controlled potentiometers + + Copyright (c) 2006 Michael Hennerich + + derived from pcf8547.c + + Copyright (c) 2000 Frodo Looijaard , + Philip Edelbrock , + Dan Eaton + Ported to Linux 2.6 by Aurelien Jarno with + the help of Jean Delvare + + + 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 +#include +#include +#include +#include + +/* Addresses to scan */ +static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END }; + +/* Insmod parameters */ +I2C_CLIENT_INSMOD_1(ad5252); + +/* Initial values */ +#define AD5252_INIT 128 /* Wiper in middle position */ +/* Each client has this additional data */ +struct ad5252_data { + struct i2c_client client; + + u8 read, write; /* Register values */ +}; + +static int ad5252_attach_adapter(struct i2c_adapter *adapter); +static int ad5252_detect(struct i2c_adapter *adapter, int address, int kind); +static int ad5252_detach_client(struct i2c_client *client); +static void ad5252_init_client(struct i2c_client *client); + +/* This is the driver that will be inserted */ +static struct i2c_driver ad5252_driver = { + .driver = { + .name = "ad5252", + }, + .id = I2C_DRIVERID_AD5252, + .attach_adapter = ad5252_attach_adapter, + .detach_client = ad5252_detach_client, +}; + +/* following are the sysfs callback functions */ +static ssize_t show_read_w1(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_data(client,0x1)); +} + +static DEVICE_ATTR(read_w1, S_IRUGO, show_read_w1, NULL); + +static ssize_t show_read_w3(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_data(client,0x3)); +} + +static DEVICE_ATTR(read_w3, S_IRUGO, show_read_w3, NULL); + +static ssize_t show_write(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct ad5252_data *data = i2c_get_clientdata(to_i2c_client(dev)); + return sprintf(buf, "%u\n", data->write); +} + +static ssize_t set_write_w1(struct device *dev, struct device_attribute *attr, const char *buf, + size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ad5252_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_data(client,0x1, data->write); + return count; +} + +static DEVICE_ATTR(write_w1, S_IWUSR | S_IRUGO, show_write, set_write_w1); + +static ssize_t set_write_w3(struct device *dev, struct device_attribute *attr, const char *buf, + size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct ad5252_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_data(client,0x3, data->write); + return count; +} + +static DEVICE_ATTR(write_w3, S_IWUSR | S_IRUGO, show_write, set_write_w3); + +/* + * Real code + */ + +static int ad5252_attach_adapter(struct i2c_adapter *adapter) +{ + return i2c_probe(adapter, &addr_data, ad5252_detect); +} + +/* This function is called by i2c_detect */ +int ad5252_detect(struct i2c_adapter *adapter, int address, int kind) +{ + struct i2c_client *new_client; + struct ad5252_data *data; + int err = 0; + const char *client_name = ""; + + 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 ad5252_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 = &ad5252_driver; + new_client->flags = 0; + + /* Determine the chip type */ + if (kind <= 0) { + if (address >= 0x2c && address <= 0x2f) + kind = ad5252; + + } + + client_name = "ad5252"; + + /* 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 */ + + /*FIXME: Don't know why there needs to be a delay !!!*/ + udelay(100); + + if ((err = i2c_attach_client(new_client))) + goto exit_free; + + /* Initialize the AD5252 chip */ + ad5252_init_client(new_client); + + /* Register sysfs hooks */ + err = device_create_file(&new_client->dev, &dev_attr_read_w1); + err |= device_create_file(&new_client->dev, &dev_attr_read_w3); + err |= device_create_file(&new_client->dev, &dev_attr_write_w1); + err |= device_create_file(&new_client->dev, &dev_attr_write_w3); + + if (err) + printk(KERN_WARNING "AD5252: failed to register sysfs hooks\n"); + + printk(KERN_INFO "AD5252 Attached\n"); + return 0; + +/* OK, this is not exactly good programming practice, usually. But it is + very code-efficient in this case. */ + + exit_free: + kfree(data); + exit: + printk(KERN_INFO "AD5252 attaching failed\n"); + return err; +} + +static int ad5252_detach_client(struct i2c_client *client) +{ + int err; + + if ((err = i2c_detach_client(client))) { + dev_err(&client->dev, + "Client deregistration failed, client not detached.\n"); + return err; + } + + kfree(i2c_get_clientdata(client)); + return 0; +} + +/* Called when we have found a new AD5252. */ +static void ad5252_init_client(struct i2c_client *client) +{ + //struct ad5252_data *data = i2c_get_clientdata(client); + //data->write = AD5252_INIT; + //i2c_smbus_write_byte_data(client,0x1, data->write); + //i2c_smbus_write_byte_data(client,0x3, data->write); +} + +static int __init ad5252_init(void) +{ + return i2c_add_driver(&ad5252_driver); +} + +static void __exit ad5252_exit(void) +{ + i2c_del_driver(&ad5252_driver); +} + + +MODULE_AUTHOR + ("Michael Hennerich , " + "Frodo Looijaard , " + "Philip Edelbrock , " + "Dan Eaton " + "and Aurelien Jarno "); +MODULE_DESCRIPTION("AD5252 digital potentiometer driver"); +MODULE_LICENSE("GPL"); + +module_init(ad5252_init); +module_exit(ad5252_exit); diff --git a/include/linux/i2c-id.h b/include/linux/i2c-id.h index 580acc9..adfcf71 100644 --- a/include/linux/i2c-id.h +++ b/include/linux/i2c-id.h @@ -94,6 +94,7 @@ #define I2C_DRIVERID_I2CDEV 900 #define I2C_DRIVERID_OV7670 1048 /* Omnivision 7670 camera */ +#define I2C_DRIVERID_AD5252 1049 /* * ---- Adapter types ---------------------------------------------------- -- 1.5.5 _______________________________________________ i2c mailing list i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org http://lists.lm-sensors.org/mailman/listinfo/i2c