cregit-Linux how code gets into the kernel

Release 4.10 drivers/hwmon/atxp1.c

Directory: drivers/hwmon
/*
 * 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.
 *
 * 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 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; }

Contributors

PersonTokensPropCommitsCommitProp
sebastian wittsebastian witt11386.92%125.00%
axel linaxel lin107.69%125.00%
jean delvarejean delvare53.85%125.00%
ingo molnaringo molnar21.54%125.00%
Total130100.00%4100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
sebastian wittsebastian witt5690.32%133.33%
greg kroah-hartmangreg kroah-hartman69.68%266.67%
Total62100.00%3100.00%


static ssize_t atxp1_storevcore(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; }

Contributors

PersonTokensPropCommitsCommitProp
sebastian wittsebastian witt19082.97%112.50%
guenter roeckguenter roeck219.17%225.00%
axel linaxel lin93.93%112.50%
greg kroah-hartmangreg kroah-hartman62.62%225.00%
alexey dobriyanalexey dobriyan20.87%112.50%
prakash punnoorprakash punnoor10.44%112.50%
Total229100.00%8100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
sebastian wittsebastian witt4989.09%133.33%
greg kroah-hartmangreg kroah-hartman610.91%266.67%
Total55100.00%3100.00%


static ssize_t atxp1_storegpio1(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; }

Contributors

PersonTokensPropCommitsCommitProp
sebastian wittsebastian witt8570.83%120.00%
guenter roeckguenter roeck2016.67%120.00%
axel linaxel lin97.50%120.00%
greg kroah-hartmangreg kroah-hartman65.00%240.00%
Total120100.00%5100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
sebastian wittsebastian witt4788.68%133.33%
greg kroah-hartmangreg kroah-hartman611.32%266.67%
Total53100.00%3100.00%


static ssize_t atxp1_storegpio2(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; }

Contributors

PersonTokensPropCommitsCommitProp
sebastian wittsebastian witt7564.66%120.00%
guenter roeckguenter roeck3227.59%120.00%
greg kroah-hartmangreg kroah-hartman65.17%240.00%
axel linaxel lin32.59%120.00%
Total116100.00%5100.00%

/* * 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_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; }

Contributors

PersonTokensPropCommitsCommitProp
jean delvarejean delvare5230.23%225.00%
guenter roeckguenter roeck4425.58%225.00%
sebastian wittsebastian witt3319.19%112.50%
axel linaxel lin2916.86%112.50%
mark m. hoffmanmark m. hoffman126.98%112.50%
tony jonestony jones21.16%112.50%
Total172100.00%8100.00%

; 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);

Overall Contributors

PersonTokensPropCommitsCommitProp
sebastian wittsebastian witt79866.17%14.76%
axel linaxel lin12610.45%314.29%
guenter roeckguenter roeck12110.03%419.05%
jean delvarejean delvare917.55%523.81%
greg kroah-hartmangreg kroah-hartman362.99%29.52%
mark m. hoffmanmark m. hoffman201.66%14.76%
ingo molnaringo molnar60.50%14.76%
tejun heotejun heo30.25%14.76%
tony jonestony jones20.17%14.76%
alexey dobriyanalexey dobriyan20.17%14.76%
prakash punnoorprakash punnoor10.08%14.76%
Total1206100.00%21100.00%
Directory: drivers/hwmon
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