drivers/hwmon/atxp1.c - kernel/msm - Gitiles

 /*
     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/jiffies.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 (time_after(jiffies, data->last_updated + HZ) || !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 */
 static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, 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;
 }

 static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, 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_dbg(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 */
 static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, 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;
 }

 static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, 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 */
 static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	int size;
 	struct atxp1_data *data;

 	data = atxp1_update_device(dev);

 	size = sprintf(buf, "0x%02x\n", data->reg.gpio2);

 	return size;
 }

 static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, 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);
	/*
	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/jiffies.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 (time_after(jiffies, data->last_updated + HZ) \|\| !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 */
	static ssize_t atxp1_showvcore(struct device dev, struct device_attribute attr, 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;
	}

	static ssize_t atxp1_storevcore(struct device dev, struct device_attribute attr, 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_dbg(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 */
	static ssize_t atxp1_showgpio1(struct device dev, struct device_attribute attr, 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;
	}

	static ssize_t atxp1_storegpio1(struct device dev, struct device_attribute attr, 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 */
	static ssize_t atxp1_showgpio2(struct device dev, struct device_attribute attr, char *buf)
	{
	int size;
	struct atxp1_data *data;

	data = atxp1_update_device(dev);

	size = sprintf(buf, "0x%02x\n", data->reg.gpio2);

	return size;
	}

	static ssize_t atxp1_storegpio2(struct device dev, struct device_attribute attr, 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);