373 строки
9.1 KiB
C
373 строки
9.1 KiB
C
/*
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atxp1.c - kernel module for setting CPU VID and general purpose
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I/Os using the Attansic ATXP1 chip.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-vid.h>
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#include <linux/err.h>
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
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MODULE_VERSION("0.6.2");
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MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");
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#define ATXP1_VID 0x00
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#define ATXP1_CVID 0x01
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#define ATXP1_GPIO1 0x06
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#define ATXP1_GPIO2 0x0a
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#define ATXP1_VIDENA 0x20
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#define ATXP1_VIDMASK 0x1f
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#define ATXP1_GPIO1MASK 0x0f
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static unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
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I2C_CLIENT_INSMOD_1(atxp1);
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static int atxp1_attach_adapter(struct i2c_adapter * adapter);
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static int atxp1_detach_client(struct i2c_client * client);
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static struct atxp1_data * atxp1_update_device(struct device *dev);
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static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind);
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static struct i2c_driver atxp1_driver = {
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.owner = THIS_MODULE,
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.name = "atxp1",
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = atxp1_attach_adapter,
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.detach_client = atxp1_detach_client,
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};
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struct atxp1_data {
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struct i2c_client client;
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struct class_device *class_dev;
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struct semaphore update_lock;
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unsigned long last_updated;
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u8 valid;
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struct {
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u8 vid; /* VID output register */
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u8 cpu_vid; /* VID input from CPU */
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u8 gpio1; /* General purpose I/O register 1 */
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u8 gpio2; /* General purpose I/O register 2 */
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} reg;
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u8 vrm; /* Detected CPU VRM */
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};
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static struct atxp1_data * atxp1_update_device(struct device *dev)
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{
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struct i2c_client *client;
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struct atxp1_data *data;
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client = to_i2c_client(dev);
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data = i2c_get_clientdata(client);
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down(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
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/* Update local register data */
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data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
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data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID);
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data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
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data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);
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data->valid = 1;
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}
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up(&data->update_lock);
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return(data);
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}
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/* sys file functions for cpu0_vid */
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static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf)
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{
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int size;
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struct atxp1_data *data;
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data = atxp1_update_device(dev);
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size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm));
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return size;
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}
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static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct atxp1_data *data;
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struct i2c_client *client;
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char vid;
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char cvid;
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unsigned int vcore;
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client = to_i2c_client(dev);
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data = atxp1_update_device(dev);
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vcore = simple_strtoul(buf, NULL, 10);
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vcore /= 25;
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vcore *= 25;
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/* Calculate VID */
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vid = vid_to_reg(vcore, data->vrm);
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if (vid < 0) {
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dev_err(dev, "VID calculation failed.\n");
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return -1;
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}
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/* If output enabled, use control register value. Otherwise original CPU VID */
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if (data->reg.vid & ATXP1_VIDENA)
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cvid = data->reg.vid & ATXP1_VIDMASK;
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else
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cvid = data->reg.cpu_vid;
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/* Nothing changed, aborting */
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if (vid == cvid)
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return count;
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dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);
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/* Write every 25 mV step to increase stability */
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if (cvid > vid) {
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for (; cvid >= vid; cvid--) {
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i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
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}
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}
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else {
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for (; cvid <= vid; cvid++) {
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i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
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}
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}
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data->valid = 0;
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return count;
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}
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/* CPU core reference voltage
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unit: millivolt
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*/
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static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore);
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/* sys file functions for GPIO1 */
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static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf)
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{
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int size;
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struct atxp1_data *data;
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data = atxp1_update_device(dev);
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size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
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return size;
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}
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static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count)
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{
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struct atxp1_data *data;
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struct i2c_client *client;
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unsigned int value;
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client = to_i2c_client(dev);
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data = atxp1_update_device(dev);
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value = simple_strtoul(buf, NULL, 16);
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value &= ATXP1_GPIO1MASK;
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if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
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dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
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i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
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data->valid = 0;
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}
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return count;
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}
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/* GPIO1 data register
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unit: Four bit as hex (e.g. 0x0f)
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*/
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static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);
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/* sys file functions for GPIO2 */
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static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf)
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{
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int size;
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struct atxp1_data *data;
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data = atxp1_update_device(dev);
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size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
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return size;
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}
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static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct atxp1_data *data;
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struct i2c_client *client;
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unsigned int value;
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client = to_i2c_client(dev);
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data = atxp1_update_device(dev);
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value = simple_strtoul(buf, NULL, 16) & 0xff;
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if (value != data->reg.gpio2) {
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dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
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i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
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data->valid = 0;
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}
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return count;
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}
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/* GPIO2 data register
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unit: Eight bit as hex (e.g. 0xff)
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*/
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static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);
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static int atxp1_attach_adapter(struct i2c_adapter *adapter)
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{
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return i2c_probe(adapter, &addr_data, &atxp1_detect);
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};
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static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind)
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{
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struct i2c_client * new_client;
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struct atxp1_data * data;
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int err = 0;
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u8 temp;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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goto exit;
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if (!(data = kmalloc(sizeof(struct atxp1_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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memset(data, 0, sizeof(struct atxp1_data));
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new_client = &data->client;
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
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new_client->adapter = adapter;
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new_client->driver = &atxp1_driver;
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new_client->flags = 0;
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/* Detect ATXP1, checking if vendor ID registers are all zero */
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if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
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(i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
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(i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
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(i2c_smbus_read_byte_data(new_client, 0xff) == 0) )) {
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/* No vendor ID, now checking if registers 0x10,0x11 (non-existent)
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* showing the same as register 0x00 */
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temp = i2c_smbus_read_byte_data(new_client, 0x00);
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if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
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(i2c_smbus_read_byte_data(new_client, 0x11) == temp) ))
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goto exit_free;
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}
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/* Get VRM */
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data->vrm = vid_which_vrm();
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if ((data->vrm != 90) && (data->vrm != 91)) {
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dev_err(&new_client->dev, "Not supporting VRM %d.%d\n",
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data->vrm / 10, data->vrm % 10);
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goto exit_free;
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}
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strncpy(new_client->name, "atxp1", I2C_NAME_SIZE);
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data->valid = 0;
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init_MUTEX(&data->update_lock);
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err = i2c_attach_client(new_client);
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if (err)
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{
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dev_err(&new_client->dev, "Attach client error.\n");
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goto exit_free;
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}
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data->class_dev = hwmon_device_register(&new_client->dev);
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if (IS_ERR(data->class_dev)) {
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err = PTR_ERR(data->class_dev);
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goto exit_detach;
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}
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device_create_file(&new_client->dev, &dev_attr_gpio1);
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device_create_file(&new_client->dev, &dev_attr_gpio2);
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device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
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dev_info(&new_client->dev, "Using VRM: %d.%d\n",
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data->vrm / 10, data->vrm % 10);
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return 0;
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exit_detach:
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i2c_detach_client(new_client);
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exit_free:
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kfree(data);
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exit:
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return err;
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};
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static int atxp1_detach_client(struct i2c_client * client)
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{
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struct atxp1_data * data = i2c_get_clientdata(client);
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int err;
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hwmon_device_unregister(data->class_dev);
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err = i2c_detach_client(client);
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if (err)
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dev_err(&client->dev, "Failed to detach client.\n");
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else
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kfree(data);
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return err;
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};
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static int __init atxp1_init(void)
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{
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return i2c_add_driver(&atxp1_driver);
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};
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static void __exit atxp1_exit(void)
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{
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i2c_del_driver(&atxp1_driver);
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};
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module_init(atxp1_init);
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module_exit(atxp1_exit);
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