308 lines
7.1 KiB
C
308 lines
7.1 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* The ATXP1 can reside on I2C addresses 0x37 or 0x4e. The chip is
|
|
* not auto-detected by the driver and must be instantiated explicitly.
|
|
* See Documentation/i2c/instantiating-devices for more information.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-vid.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/slab.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
|
|
MODULE_VERSION("0.6.3");
|
|
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
|
|
|
|
struct atxp1_data {
|
|
struct i2c_client *client;
|
|
struct mutex 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 atxp1_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
|
|
mutex_lock(&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;
|
|
}
|
|
|
|
mutex_unlock(&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 = atxp1_update_device(dev);
|
|
struct i2c_client *client = data->client;
|
|
int vid, cvid;
|
|
unsigned long vcore;
|
|
int err;
|
|
|
|
err = kstrtoul(buf, 10, &vcore);
|
|
if (err)
|
|
return err;
|
|
|
|
vcore /= 25;
|
|
vcore *= 25;
|
|
|
|
/* Calculate VID */
|
|
vid = vid_to_reg(vcore, data->vrm);
|
|
if (vid < 0) {
|
|
dev_err(dev, "VID calculation failed.\n");
|
|
return vid;
|
|
}
|
|
|
|
/*
|
|
* 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", (int)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 = atxp1_update_device(dev);
|
|
struct i2c_client *client = data->client;
|
|
unsigned long value;
|
|
int err;
|
|
|
|
err = kstrtoul(buf, 16, &value);
|
|
if (err)
|
|
return err;
|
|
|
|
value &= ATXP1_GPIO1MASK;
|
|
|
|
if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
|
|
dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)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 = atxp1_update_device(dev);
|
|
struct i2c_client *client = data->client;
|
|
unsigned long value;
|
|
int err;
|
|
|
|
err = kstrtoul(buf, 16, &value);
|
|
if (err)
|
|
return err;
|
|
value &= 0xff;
|
|
|
|
if (value != data->reg.gpio2) {
|
|
dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)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 struct attribute *atxp1_attrs[] = {
|
|
&dev_attr_gpio1.attr,
|
|
&dev_attr_gpio2.attr,
|
|
&dev_attr_cpu0_vid.attr,
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(atxp1);
|
|
|
|
static int atxp1_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct atxp1_data *data;
|
|
struct device *hwmon_dev;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct atxp1_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
/* Get VRM */
|
|
data->vrm = vid_which_vrm();
|
|
if (data->vrm != 90 && data->vrm != 91) {
|
|
dev_err(dev, "atxp1: Not supporting VRM %d.%d\n",
|
|
data->vrm / 10, data->vrm % 10);
|
|
return -ENODEV;
|
|
}
|
|
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
|
data,
|
|
atxp1_groups);
|
|
if (IS_ERR(hwmon_dev))
|
|
return PTR_ERR(hwmon_dev);
|
|
|
|
dev_info(dev, "Using VRM: %d.%d\n", data->vrm / 10, data->vrm % 10);
|
|
|
|
return 0;
|
|
};
|
|
|
|
static const struct i2c_device_id atxp1_id[] = {
|
|
{ "atxp1", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, atxp1_id);
|
|
|
|
static struct i2c_driver atxp1_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "atxp1",
|
|
},
|
|
.probe = atxp1_probe,
|
|
.id_table = atxp1_id,
|
|
};
|
|
|
|
module_i2c_driver(atxp1_driver);
|