linux-stable/drivers/hwmon/atxp1.c
Stephen Kitt 6748703856 hwmon: use simple i2c probe function
Many hwmon drivers don't use the id information provided by the old
i2c probe function, and the remainder can easily be adapted to the new
form ("probe_new") by calling i2c_match_id explicitly.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

A few drivers aren't included in this patch because they have a
different set of maintainers. They will be covered by other patches.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

294 lines
6.5 KiB
C

// 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)
{
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_new = atxp1_probe,
.id_table = atxp1_id,
};
module_i2c_driver(atxp1_driver);