diff options
Diffstat (limited to 'drivers/hwmon/atxp1.c')
| -rw-r--r-- | drivers/hwmon/atxp1.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/drivers/hwmon/atxp1.c b/drivers/hwmon/atxp1.c new file mode 100644 index 0000000..d6b490d --- /dev/null +++ b/drivers/hwmon/atxp1.c @@ -0,0 +1,383 @@ +/* + 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/hwmon.h> +#include <linux/hwmon-vid.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/sysfs.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 + +static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END }; + +I2C_CLIENT_INSMOD_1(atxp1); + +static int atxp1_probe(struct i2c_client *client, + const struct i2c_device_id *id); +static int atxp1_remove(struct i2c_client *client); +static struct atxp1_data * atxp1_update_device(struct device *dev); +static int atxp1_detect(struct i2c_client *client, int kind, + struct i2c_board_info *info); + +static const struct i2c_device_id atxp1_id[] = { + { "atxp1", atxp1 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, atxp1_id); + +static struct i2c_driver atxp1_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "atxp1", + }, + .probe = atxp1_probe, + .remove = atxp1_remove, + .id_table = atxp1_id, + .detect = atxp1_detect, + .address_data = &addr_data, +}; + +struct atxp1_data { + struct device *hwmon_dev; + 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 i2c_client *client; + struct atxp1_data *data; + + client = to_i2c_client(dev); + data = i2c_get_clientdata(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; + struct i2c_client *client; + int vid, 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 struct attribute *atxp1_attributes[] = { + &dev_attr_gpio1.attr, + &dev_attr_gpio2.attr, + &dev_attr_cpu0_vid.attr, + NULL +}; + +static const struct attribute_group atxp1_group = { + .attrs = atxp1_attributes, +}; + + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int atxp1_detect(struct i2c_client *new_client, int kind, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = new_client->adapter; + + u8 temp; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + /* 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))) + return -ENODEV; + + /* 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))) + return -ENODEV; + + /* Get VRM */ + temp = vid_which_vrm(); + + if ((temp != 90) && (temp != 91)) { + dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n", + temp / 10, temp % 10); + return -ENODEV; + } + + strlcpy(info->type, "atxp1", I2C_NAME_SIZE); + + return 0; +} + +static int atxp1_probe(struct i2c_client *new_client, + const struct i2c_device_id *id) +{ + struct atxp1_data *data; + int err; + + data = kzalloc(sizeof(struct atxp1_data), GFP_KERNEL); + if (!data) { + err = -ENOMEM; + goto exit; + } + + /* Get VRM */ + data->vrm = vid_which_vrm(); + + i2c_set_clientdata(new_client, data); + data->valid = 0; + + mutex_init(&data->update_lock); + + /* Register sysfs hooks */ + if ((err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group))) + goto exit_free; + + data->hwmon_dev = hwmon_device_register(&new_client->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto exit_remove_files; + } + + dev_info(&new_client->dev, "Using VRM: %d.%d\n", + data->vrm / 10, data->vrm % 10); + + return 0; + +exit_remove_files: + sysfs_remove_group(&new_client->dev.kobj, &atxp1_group); +exit_free: + kfree(data); +exit: + return err; +}; + +static int atxp1_remove(struct i2c_client *client) +{ + struct atxp1_data * data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &atxp1_group); + + kfree(data); + + return 0; +}; + +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); |
