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

drivers/i2c/chips/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -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

drivers/i2c/chips/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/i2c/chips/atxp1.c

0 → 100644
+361 −0
Original line number Diff line number Diff line 
/*

    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);