[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/drivers/hwmon/ds1621.c b/ap/os/linux/linux-3.4.x/drivers/hwmon/ds1621.c
new file mode 100644
index 0000000..f647a33
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hwmon/ds1621.c
@@ -0,0 +1,321 @@
+/*
+ * ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
+ * monitoring
+ * Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23
+ * based on lm75.c by Frodo Looijaard <frodol@dds.nl>
+ * Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
+ * the help of Jean Delvare <khali@linux-fr.org>
+ *
+ * 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 "lm75.h"
+
+/* Addresses to scan */
+static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
+ 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
+
+/* Insmod parameters */
+static int polarity = -1;
+module_param(polarity, int, 0);
+MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");
+
+/* Many DS1621 constants specified below */
+/* Config register used for detection */
+/* 7 6 5 4 3 2 1 0 */
+/* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */
+#define DS1621_REG_CONFIG_NVB 0x10
+#define DS1621_REG_CONFIG_POLARITY 0x02
+#define DS1621_REG_CONFIG_1SHOT 0x01
+#define DS1621_REG_CONFIG_DONE 0x80
+
+/* The DS1621 registers */
+static const u8 DS1621_REG_TEMP[3] = {
+ 0xAA, /* input, word, RO */
+ 0xA2, /* min, word, RW */
+ 0xA1, /* max, word, RW */
+};
+#define DS1621_REG_CONF 0xAC /* byte, RW */
+#define DS1621_COM_START 0xEE /* no data */
+#define DS1621_COM_STOP 0x22 /* no data */
+
+/* The DS1621 configuration register */
+#define DS1621_ALARM_TEMP_HIGH 0x40
+#define DS1621_ALARM_TEMP_LOW 0x20
+
+/* Conversions */
+#define ALARMS_FROM_REG(val) ((val) & \
+ (DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW))
+
+/* Each client has this additional data */
+struct ds1621_data {
+ struct device *hwmon_dev;
+ struct mutex update_lock;
+ char valid; /* !=0 if following fields are valid */
+ unsigned long last_updated; /* In jiffies */
+
+ u16 temp[3]; /* Register values, word */
+ u8 conf; /* Register encoding, combined */
+};
+
+static void ds1621_init_client(struct i2c_client *client)
+{
+ u8 conf, new_conf;
+
+ new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
+ /* switch to continuous conversion mode */
+ new_conf &= ~DS1621_REG_CONFIG_1SHOT;
+
+ /* setup output polarity */
+ if (polarity == 0)
+ new_conf &= ~DS1621_REG_CONFIG_POLARITY;
+ else if (polarity == 1)
+ new_conf |= DS1621_REG_CONFIG_POLARITY;
+
+ if (conf != new_conf)
+ i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf);
+
+ /* start conversion */
+ i2c_smbus_write_byte(client, DS1621_COM_START);
+}
+
+static struct ds1621_data *ds1621_update_client(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ds1621_data *data = i2c_get_clientdata(client);
+ u8 new_conf;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+ || !data->valid) {
+ int i;
+
+ dev_dbg(&client->dev, "Starting ds1621 update\n");
+
+ data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
+
+ for (i = 0; i < ARRAY_SIZE(data->temp); i++)
+ data->temp[i] = i2c_smbus_read_word_swapped(client,
+ DS1621_REG_TEMP[i]);
+
+ /* reset alarms if necessary */
+ new_conf = data->conf;
+ if (data->temp[0] > data->temp[1]) /* input > min */
+ new_conf &= ~DS1621_ALARM_TEMP_LOW;
+ if (data->temp[0] < data->temp[2]) /* input < max */
+ new_conf &= ~DS1621_ALARM_TEMP_HIGH;
+ if (data->conf != new_conf)
+ i2c_smbus_write_byte_data(client, DS1621_REG_CONF,
+ new_conf);
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
+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 ds1621_data *data = ds1621_update_client(dev);
+ return sprintf(buf, "%d\n",
+ LM75_TEMP_FROM_REG(data->temp[attr->index]));
+}
+
+static ssize_t set_temp(struct device *dev, struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ds1621_data *data = i2c_get_clientdata(client);
+ long val;
+ int err;
+
+ err = kstrtol(buf, 10, &val);
+ if (err)
+ return err;
+
+ mutex_lock(&data->update_lock);
+ data->temp[attr->index] = LM75_TEMP_TO_REG(val);
+ i2c_smbus_write_word_swapped(client, DS1621_REG_TEMP[attr->index],
+ data->temp[attr->index]);
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
+ char *buf)
+{
+ struct ds1621_data *data = ds1621_update_client(dev);
+ return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
+}
+
+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 ds1621_data *data = ds1621_update_client(dev);
+ return sprintf(buf, "%d\n", !!(data->conf & attr->index));
+}
+
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+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,
+ DS1621_ALARM_TEMP_LOW);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
+ DS1621_ALARM_TEMP_HIGH);
+
+static struct attribute *ds1621_attributes[] = {
+ &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,
+ &dev_attr_alarms.attr,
+ NULL
+};
+
+static const struct attribute_group ds1621_group = {
+ .attrs = ds1621_attributes,
+};
+
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int ds1621_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ int conf, temp;
+ int i;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
+ | I2C_FUNC_SMBUS_WORD_DATA
+ | I2C_FUNC_SMBUS_WRITE_BYTE))
+ return -ENODEV;
+
+ /*
+ * Now, we do the remaining detection. It is lousy.
+ *
+ * The NVB bit should be low if no EEPROM write has been requested
+ * during the latest 10ms, which is highly improbable in our case.
+ */
+ conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
+ if (conf < 0 || conf & DS1621_REG_CONFIG_NVB)
+ return -ENODEV;
+ /* The 7 lowest bits of a temperature should always be 0. */
+ for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
+ temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]);
+ if (temp < 0 || (temp & 0x7f00))
+ return -ENODEV;
+ }
+
+ strlcpy(info->type, "ds1621", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int ds1621_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ds1621_data *data;
+ int err;
+
+ data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ /* Initialize the DS1621 chip */
+ ds1621_init_client(client);
+
+ /* Register sysfs hooks */
+ err = sysfs_create_group(&client->dev.kobj, &ds1621_group);
+ if (err)
+ goto exit_free;
+
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ err = PTR_ERR(data->hwmon_dev);
+ goto exit_remove_files;
+ }
+
+ return 0;
+
+ exit_remove_files:
+ sysfs_remove_group(&client->dev.kobj, &ds1621_group);
+ exit_free:
+ kfree(data);
+ exit:
+ return err;
+}
+
+static int ds1621_remove(struct i2c_client *client)
+{
+ struct ds1621_data *data = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &ds1621_group);
+
+ kfree(data);
+
+ return 0;
+}
+
+static const struct i2c_device_id ds1621_id[] = {
+ { "ds1621", 0 },
+ { "ds1625", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ds1621_id);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver ds1621_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "ds1621",
+ },
+ .probe = ds1621_probe,
+ .remove = ds1621_remove,
+ .id_table = ds1621_id,
+ .detect = ds1621_detect,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(ds1621_driver);
+
+MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
+MODULE_DESCRIPTION("DS1621 driver");
+MODULE_LICENSE("GPL");