Contributors: 14
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Sebastian Witt |
765 |
64.67% |
1 |
4.17% |
| Axel Lin |
126 |
10.65% |
3 |
12.50% |
| Guenter Roeck |
120 |
10.14% |
4 |
16.67% |
| Jean Delvare |
91 |
7.69% |
5 |
20.83% |
| Greg Kroah-Hartman |
36 |
3.04% |
2 |
8.33% |
| Mark M. Hoffman |
20 |
1.69% |
1 |
4.17% |
| Julia Lawall |
9 |
0.76% |
1 |
4.17% |
| Ingo Molnar |
6 |
0.51% |
1 |
4.17% |
| Tejun Heo |
3 |
0.25% |
1 |
4.17% |
| Tony Jones |
2 |
0.17% |
1 |
4.17% |
| Alexey Dobriyan |
2 |
0.17% |
1 |
4.17% |
| Prakash Punnoor |
1 |
0.08% |
1 |
4.17% |
| Thomas Gleixner |
1 |
0.08% |
1 |
4.17% |
| Mauro Carvalho Chehab |
1 |
0.08% |
1 |
4.17% |
| Total |
1183 |
|
24 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* atxp1.c - kernel module for setting CPU VID and general purpose
* I/Os using the Attansic ATXP1 chip.
*
* 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.rst 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 cpu0_vid_show(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 cpu0_vid_store(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_RW(cpu0_vid);
/* sys file functions for GPIO1 */
static ssize_t gpio1_show(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 gpio1_store(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_RW(gpio1);
/* sys file functions for GPIO2 */
static ssize_t gpio2_show(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 gpio2_store(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_RW(gpio2);
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);