Commit 9cb7d184 authored by Sebastian Witt's avatar Sebastian Witt Committed by Greg Kroah-Hartman

[PATCH] I2C: add new atxp1 driver

Adds support for the Attansic ATXP1 I2C device, found on some x86
plattforms to change CPU and other voltages.  Depends on the previous
i2c-vid.h patch.
Signed-off-by: default avatarSebastian Witt <se.witt@gmx.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 3886246a
......@@ -62,6 +62,19 @@ config SENSORS_ASB100
This driver can also be built as a module. If so, the module
will be called asb100.
config SENSORS_ATXP1
tristate "Attansic ATXP1 VID controller"
depends on I2C && EXPERIMENTAL
help
If you say yes here you get support for the Attansic ATXP1 VID
controller.
If your board have such a chip, you are able to control your CPU
core and other voltages.
This driver can also be built as a module. If so, the module
will be called atxp1.
config SENSORS_DS1621
tristate "Dallas Semiconductor DS1621 and DS1625"
depends on I2C && EXPERIMENTAL
......
......@@ -11,6 +11,7 @@ obj-$(CONFIG_SENSORS_ADM1021) += adm1021.o
obj-$(CONFIG_SENSORS_ADM1025) += adm1025.o
obj-$(CONFIG_SENSORS_ADM1026) += adm1026.o
obj-$(CONFIG_SENSORS_ADM1031) += adm1031.o
obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
obj-$(CONFIG_SENSORS_DS1337) += ds1337.o
obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o
......
/*
atxp1.c - kernel module for setting CPU VID and general purpose
I/Os using the Attansic ATXP1 chip.
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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c-sensor.h>
#include <linux/i2c-vid.h>
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
MODULE_VERSION("0.6.2");
MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");
#define ATXP1_VID 0x00
#define ATXP1_CVID 0x01
#define ATXP1_GPIO1 0x06
#define ATXP1_GPIO2 0x0a
#define ATXP1_VIDENA 0x20
#define ATXP1_VIDMASK 0x1f
#define ATXP1_GPIO1MASK 0x0f
static unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
SENSORS_INSMOD_1(atxp1);
static int atxp1_attach_adapter(struct i2c_adapter * adapter);
static int atxp1_detach_client(struct i2c_client * client);
static struct atxp1_data * atxp1_update_device(struct device *dev);
static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind);
static struct i2c_driver atxp1_driver = {
.owner = THIS_MODULE,
.name = "atxp1",
.flags = I2C_DF_NOTIFY,
.attach_adapter = atxp1_attach_adapter,
.detach_client = atxp1_detach_client,
};
struct atxp1_data {
struct i2c_client client;
struct semaphore update_lock;
unsigned long last_updated;
u8 valid;
struct {
u8 vid; /* VID output register */
u8 cpu_vid; /* VID input from CPU */
u8 gpio1; /* General purpose I/O register 1 */
u8 gpio2; /* General purpose I/O register 2 */
} reg;
u8 vrm; /* Detected CPU VRM */
};
static struct atxp1_data * atxp1_update_device(struct device *dev)
{
struct i2c_client *client;
struct atxp1_data *data;
client = to_i2c_client(dev);
data = i2c_get_clientdata(client);
down(&data->update_lock);
if ((jiffies - data->last_updated > HZ) ||
(jiffies < data->last_updated) ||
!data->valid) {
/* Update local register data */
data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID);
data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);
data->valid = 1;
}
up(&data->update_lock);
return(data);
}
/* sys file functions for cpu0_vid */
ssize_t atxp1_showvcore(struct device *dev, char *buf)
{
int size;
struct atxp1_data *data;
data = atxp1_update_device(dev);
size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm));
return size;
}
ssize_t atxp1_storevcore(struct device *dev, const char* buf, size_t count)
{
struct atxp1_data *data;
struct i2c_client *client;
char vid;
char cvid;
unsigned int vcore;
client = to_i2c_client(dev);
data = atxp1_update_device(dev);
vcore = simple_strtoul(buf, NULL, 10);
vcore /= 25;
vcore *= 25;
/* Calculate VID */
vid = vid_to_reg(vcore, data->vrm);
if (vid < 0) {
dev_err(dev, "VID calculation failed.\n");
return -1;
}
/* If output enabled, use control register value. Otherwise original CPU VID */
if (data->reg.vid & ATXP1_VIDENA)
cvid = data->reg.vid & ATXP1_VIDMASK;
else
cvid = data->reg.cpu_vid;
/* Nothing changed, aborting */
if (vid == cvid)
return count;
dev_info(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);
/* Write every 25 mV step to increase stability */
if (cvid > vid) {
for (; cvid >= vid; cvid--) {
i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
}
}
else {
for (; cvid <= vid; cvid++) {
i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
}
}
data->valid = 0;
return count;
}
/* CPU core reference voltage
unit: millivolt
*/
static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore);
/* sys file functions for GPIO1 */
ssize_t atxp1_showgpio1(struct device *dev, char *buf)
{
int size;
struct atxp1_data *data;
data = atxp1_update_device(dev);
size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
return size;
}
ssize_t atxp1_storegpio1(struct device *dev, const char* buf, size_t count)
{
struct atxp1_data *data;
struct i2c_client *client;
unsigned int value;
client = to_i2c_client(dev);
data = atxp1_update_device(dev);
value = simple_strtoul(buf, NULL, 16);
value &= ATXP1_GPIO1MASK;
if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
data->valid = 0;
}
return count;
}
/* GPIO1 data register
unit: Four bit as hex (e.g. 0x0f)
*/
static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);
/* sys file functions for GPIO2 */
ssize_t atxp1_showgpio2(struct device *dev, char *buf)
{
int size;
struct atxp1_data *data;
data = atxp1_update_device(dev);
size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
return size;
}
ssize_t atxp1_storegpio2(struct device *dev, const char* buf, size_t count)
{
struct atxp1_data *data;
struct i2c_client *client;
unsigned int value;
client = to_i2c_client(dev);
data = atxp1_update_device(dev);
value = simple_strtoul(buf, NULL, 16) & 0xff;
if (value != data->reg.gpio2) {
dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
data->valid = 0;
}
return count;
}
/* GPIO2 data register
unit: Eight bit as hex (e.g. 0xff)
*/
static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);
static int atxp1_attach_adapter(struct i2c_adapter *adapter)
{
return i2c_detect(adapter, &addr_data, &atxp1_detect);
};
static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client * new_client;
struct atxp1_data * data;
int err = 0;
u8 temp;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto exit;
if (!(data = kmalloc(sizeof(struct atxp1_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
memset(data, 0, sizeof(struct atxp1_data));
new_client = &data->client;
i2c_set_clientdata(new_client, data);
new_client->addr = address;
new_client->adapter = adapter;
new_client->driver = &atxp1_driver;
new_client->flags = 0;
/* Detect ATXP1, checking if vendor ID registers are all zero */
if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
(i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
(i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
(i2c_smbus_read_byte_data(new_client, 0xff) == 0) )) {
/* No vendor ID, now checking if registers 0x10,0x11 (non-existent)
* showing the same as register 0x00 */
temp = i2c_smbus_read_byte_data(new_client, 0x00);
if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
(i2c_smbus_read_byte_data(new_client, 0x11) == temp) ))
goto exit_free;
}
/* Get VRM */
data->vrm = i2c_which_vrm();
if ((data->vrm != 90) && (data->vrm != 91)) {
dev_err(&new_client->dev, "Not supporting VRM %d.%d\n",
data->vrm / 10, data->vrm % 10);
goto exit_free;
}
strncpy(new_client->name, "atxp1", I2C_NAME_SIZE);
data->valid = 0;
init_MUTEX(&data->update_lock);
err = i2c_attach_client(new_client);
if (err)
{
dev_err(&new_client->dev, "Attach client error.\n");
goto exit_free;
}
device_create_file(&new_client->dev, &dev_attr_gpio1);
device_create_file(&new_client->dev, &dev_attr_gpio2);
device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
dev_info(&new_client->dev, "Using VRM: %d.%d\n",
data->vrm / 10, data->vrm % 10);
return 0;
exit_free:
kfree(data);
exit:
return err;
};
static int atxp1_detach_client(struct i2c_client * client)
{
int err;
err = i2c_detach_client(client);
if (err)
dev_err(&client->dev, "Failed to detach client.\n");
else
kfree(i2c_get_clientdata(client));
return err;
};
static int __init atxp1_init(void)
{
return i2c_add_driver(&atxp1_driver);
};
static void __exit atxp1_exit(void)
{
i2c_del_driver(&atxp1_driver);
};
module_init(atxp1_init);
module_exit(atxp1_exit);
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment