cregit-Linux how code gets into the kernel

Release 4.10 drivers/hwmon/ds620.c

Directory: drivers/hwmon
/*
 *  ds620.c - Support for temperature sensor and thermostat DS620
 *
 *  Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
 *
 *  based on ds1621.c by Christian W. Zuckschwerdt  <zany@triq.net>
 *
 *  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/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/i2c/ds620.h>

/*
 * Many DS620 constants specified below
 *  15   14   13   12   11   10   09    08
 * |Done|NVB |THF |TLF |R1  |R0  |AUTOC|1SHOT|
 *
 *  07   06   05   04   03   02   01    00
 * |PO2 |PO1 |A2  |A1  |A0  |    |     |     |
 */

#define DS620_REG_CONFIG_DONE		0x8000

#define DS620_REG_CONFIG_NVB		0x4000

#define DS620_REG_CONFIG_THF		0x2000

#define DS620_REG_CONFIG_TLF		0x1000

#define DS620_REG_CONFIG_R1		0x0800

#define DS620_REG_CONFIG_R0		0x0400

#define DS620_REG_CONFIG_AUTOC		0x0200

#define DS620_REG_CONFIG_1SHOT		0x0100

#define DS620_REG_CONFIG_PO2		0x0080

#define DS620_REG_CONFIG_PO1		0x0040

#define DS620_REG_CONFIG_A2		0x0020

#define DS620_REG_CONFIG_A1		0x0010

#define DS620_REG_CONFIG_A0		0x0008

/* The DS620 registers */

static const u8 DS620_REG_TEMP[3] = {
	0xAA,			/* input, word, RO */
	0xA2,			/* min, word, RW */
	0xA0,			/* max, word, RW */
};


#define DS620_REG_CONF		0xAC	
/* word, RW */

#define DS620_COM_START		0x51	
/* no data */

#define DS620_COM_STOP		0x22	
/* no data */

/* Each client has this additional data */

struct ds620_data {
	
struct i2c_client *client;
	
struct mutex update_lock;
	
char valid;		/* !=0 if following fields are valid */
	
unsigned long last_updated;	/* In jiffies */

	
s16 temp[3];		/* Register values, word */
};


static void ds620_init_client(struct i2c_client *client) { struct ds620_platform_data *ds620_info = dev_get_platdata(&client->dev); u16 conf, new_conf; new_conf = conf = i2c_smbus_read_word_swapped(client, DS620_REG_CONF); /* switch to continuous conversion mode */ new_conf &= ~DS620_REG_CONFIG_1SHOT; /* already high at power-on, but don't trust the BIOS! */ new_conf |= DS620_REG_CONFIG_PO2; /* thermostat mode according to platform data */ if (ds620_info && ds620_info->pomode == 1) new_conf &= ~DS620_REG_CONFIG_PO1; /* PO_LOW */ else if (ds620_info && ds620_info->pomode == 2) new_conf |= DS620_REG_CONFIG_PO1; /* PO_HIGH */ else new_conf &= ~DS620_REG_CONFIG_PO2; /* always low */ /* with highest precision */ new_conf |= DS620_REG_CONFIG_R1 | DS620_REG_CONFIG_R0; if (conf != new_conf) i2c_smbus_write_word_swapped(client, DS620_REG_CONF, new_conf); /* start conversion */ i2c_smbus_write_byte(client, DS620_COM_START); }

Contributors

PersonTokensPropCommitsCommitProp
roland stiggeroland stigge11595.04%133.33%
jingoo hanjingoo han43.31%133.33%
jean delvarejean delvare21.65%133.33%
Total121100.00%3100.00%


static struct ds620_data *ds620_update_client(struct device *dev) { struct ds620_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; struct ds620_data *ret = data; mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || !data->valid) { int i; int res; dev_dbg(&client->dev, "Starting ds620 update\n"); for (i = 0; i < ARRAY_SIZE(data->temp); i++) { res = i2c_smbus_read_word_swapped(client, DS620_REG_TEMP[i]); if (res < 0) { ret = ERR_PTR(res); goto abort; } data->temp[i] = res; } data->last_updated = jiffies; data->valid = 1; } abort: mutex_unlock(&data->update_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
roland stiggeroland stigge16395.32%133.33%
axel linaxel lin74.09%133.33%
jean delvarejean delvare10.58%133.33%
Total171100.00%3100.00%


static ssize_t show_temp(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct ds620_data *data = ds620_update_client(dev); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%d\n", ((data->temp[attr->index] / 8) * 625) / 10); }

Contributors

PersonTokensPropCommitsCommitProp
roland stiggeroland stigge80100.00%1100.00%
Total80100.00%1100.00%


static ssize_t set_temp(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { int res; long val; struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct ds620_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; res = kstrtol(buf, 10, &val); if (res) return res; val = (clamp_val(val, -128000, 128000) * 10 / 625) * 8; mutex_lock(&data->update_lock); data->temp[attr->index] = val; i2c_smbus_write_word_swapped(client, DS620_REG_TEMP[attr->index], data->temp[attr->index]); mutex_unlock(&data->update_lock); return count; }

Contributors

PersonTokensPropCommitsCommitProp
roland stiggeroland stigge13288.59%120.00%
guenter roeckguenter roeck85.37%120.00%
axel linaxel lin74.70%120.00%
frans meulenbroeksfrans meulenbroeks10.67%120.00%
jean delvarejean delvare10.67%120.00%
Total149100.00%5100.00%


static ssize_t show_alarm(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct ds620_data *data = ds620_update_client(dev); struct i2c_client *client; u16 conf, new_conf; int res; if (IS_ERR(data)) return PTR_ERR(data); client = data->client; /* reset alarms if necessary */ res = i2c_smbus_read_word_swapped(client, DS620_REG_CONF); if (res < 0) return res; new_conf = conf = res; new_conf &= ~attr->index; if (conf != new_conf) { res = i2c_smbus_write_word_swapped(client, DS620_REG_CONF, new_conf); if (res < 0) return res; } return sprintf(buf, "%d\n", !!(conf & attr->index)); }

Contributors

PersonTokensPropCommitsCommitProp
roland stiggeroland stigge14093.33%133.33%
axel linaxel lin64.00%133.33%
jean delvarejean delvare42.67%133.33%
Total150100.00%3100.00%

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1); static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, DS620_REG_CONFIG_TLF); static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, DS620_REG_CONFIG_THF); static struct attribute *ds620_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, NULL }; ATTRIBUTE_GROUPS(ds620);
static int ds620_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct device *hwmon_dev; struct ds620_data *data; data = devm_kzalloc(dev, sizeof(struct ds620_data), GFP_KERNEL); if (!data) return -ENOMEM; data->client = client; mutex_init(&data->update_lock); /* Initialize the DS620 chip */ ds620_init_client(client); hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, ds620_groups); return PTR_ERR_OR_ZERO(hwmon_dev); }

Contributors

PersonTokensPropCommitsCommitProp
roland stiggeroland stigge7270.59%133.33%
axel linaxel lin2524.51%133.33%
guenter roeckguenter roeck54.90%133.33%
Total102100.00%3100.00%

static const struct i2c_device_id ds620_id[] = { {"ds620", 0}, {} }; MODULE_DEVICE_TABLE(i2c, ds620_id); /* This is the driver that will be inserted */ static struct i2c_driver ds620_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "ds620", }, .probe = ds620_probe, .id_table = ds620_id, }; module_i2c_driver(ds620_driver); MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); MODULE_DESCRIPTION("DS620 driver"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
roland stiggeroland stigge104992.91%222.22%
axel linaxel lin544.78%222.22%
guenter roeckguenter roeck131.15%222.22%
jean delvarejean delvare80.71%111.11%
jingoo hanjingoo han40.35%111.11%
frans meulenbroeksfrans meulenbroeks10.09%111.11%
Total1129100.00%9100.00%
Directory: drivers/hwmon
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