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294 lines
6.5 KiB
294 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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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* |
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* The ATXP1 can reside on I2C addresses 0x37 or 0x4e. The chip is |
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* not auto-detected by the driver and must be instantiated explicitly. |
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* See Documentation/i2c/instantiating-devices.rst for more information. |
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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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#include <linux/mutex.h> |
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#include <linux/sysfs.h> |
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#include <linux/slab.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("0.6.3"); |
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MODULE_AUTHOR("Sebastian Witt <[email protected]>"); |
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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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struct atxp1_data { |
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struct i2c_client *client; |
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struct mutex 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 atxp1_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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mutex_lock(&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, |
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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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mutex_unlock(&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 cpu0_vid_show(struct device *dev, |
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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, |
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data->vrm)); |
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return size; |
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} |
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static ssize_t cpu0_vid_store(struct device *dev, |
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struct device_attribute *attr, const char *buf, |
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size_t count) |
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{ |
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struct atxp1_data *data = atxp1_update_device(dev); |
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struct i2c_client *client = data->client; |
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int vid, cvid; |
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unsigned long vcore; |
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int err; |
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err = kstrtoul(buf, 10, &vcore); |
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if (err) |
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return err; |
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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 vid; |
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} |
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/* |
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* If output enabled, use control register value. |
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* Otherwise original CPU VID |
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*/ |
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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", (int)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, |
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ATXP1_VID, cvid | ATXP1_VIDENA); |
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} else { |
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for (; cvid <= vid; cvid++) |
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i2c_smbus_write_byte_data(client, |
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ATXP1_VID, cvid | ATXP1_VIDENA); |
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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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/* |
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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_RW(cpu0_vid); |
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/* sys file functions for GPIO1 */ |
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static ssize_t gpio1_show(struct device *dev, struct device_attribute *attr, |
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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 gpio1_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct atxp1_data *data = atxp1_update_device(dev); |
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struct i2c_client *client = data->client; |
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unsigned long value; |
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int err; |
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err = kstrtoul(buf, 16, &value); |
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if (err) |
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return err; |
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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", (unsigned int)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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/* |
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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_RW(gpio1); |
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/* sys file functions for GPIO2 */ |
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static ssize_t gpio2_show(struct device *dev, struct device_attribute *attr, |
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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 gpio2_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct atxp1_data *data = atxp1_update_device(dev); |
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struct i2c_client *client = data->client; |
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unsigned long value; |
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int err; |
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err = kstrtoul(buf, 16, &value); |
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if (err) |
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return err; |
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value &= 0xff; |
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if (value != data->reg.gpio2) { |
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dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)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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/* |
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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_RW(gpio2); |
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static struct attribute *atxp1_attrs[] = { |
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&dev_attr_gpio1.attr, |
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&dev_attr_gpio2.attr, |
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&dev_attr_cpu0_vid.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(atxp1); |
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static int atxp1_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct atxp1_data *data; |
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struct device *hwmon_dev; |
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data = devm_kzalloc(dev, sizeof(struct atxp1_data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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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(dev, "atxp1: Not supporting VRM %d.%d\n", |
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data->vrm / 10, data->vrm % 10); |
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return -ENODEV; |
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} |
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data->client = client; |
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mutex_init(&data->update_lock); |
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
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data, |
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atxp1_groups); |
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if (IS_ERR(hwmon_dev)) |
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return PTR_ERR(hwmon_dev); |
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dev_info(dev, "Using VRM: %d.%d\n", data->vrm / 10, data->vrm % 10); |
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return 0; |
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}; |
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static const struct i2c_device_id atxp1_id[] = { |
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{ "atxp1", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, atxp1_id); |
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static struct i2c_driver atxp1_driver = { |
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.class = I2C_CLASS_HWMON, |
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.driver = { |
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.name = "atxp1", |
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}, |
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.probe_new = atxp1_probe, |
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.id_table = atxp1_id, |
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}; |
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module_i2c_driver(atxp1_driver);
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