[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/lm95241.c b/ap/os/linux/linux-3.4.x/drivers/hwmon/lm95241.c
new file mode 100644
index 0000000..bd8cdb7
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/hwmon/lm95241.c
@@ -0,0 +1,462 @@
+/*
+ * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
+ *
+ * The LM95241 is a sensor chip made by National Semiconductors.
+ * It reports up to three temperatures (its own plus up to two external ones).
+ * Complete datasheet can be obtained from National's website at:
+ * http://www.national.com/ds.cgi/LM/LM95241.pdf
+ *
+ * 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>
+
+#define DEVNAME "lm95241"
+
+static const unsigned short normal_i2c[] = {
+ 0x19, 0x2a, 0x2b, I2C_CLIENT_END };
+
+/* LM95241 registers */
+#define LM95241_REG_R_MAN_ID 0xFE
+#define LM95241_REG_R_CHIP_ID 0xFF
+#define LM95241_REG_R_STATUS 0x02
+#define LM95241_REG_RW_CONFIG 0x03
+#define LM95241_REG_RW_REM_FILTER 0x06
+#define LM95241_REG_RW_TRUTHERM 0x07
+#define LM95241_REG_W_ONE_SHOT 0x0F
+#define LM95241_REG_R_LOCAL_TEMPH 0x10
+#define LM95241_REG_R_REMOTE1_TEMPH 0x11
+#define LM95241_REG_R_REMOTE2_TEMPH 0x12
+#define LM95241_REG_R_LOCAL_TEMPL 0x20
+#define LM95241_REG_R_REMOTE1_TEMPL 0x21
+#define LM95241_REG_R_REMOTE2_TEMPL 0x22
+#define LM95241_REG_RW_REMOTE_MODEL 0x30
+
+/* LM95241 specific bitfields */
+#define CFG_STOP 0x40
+#define CFG_CR0076 0x00
+#define CFG_CR0182 0x10
+#define CFG_CR1000 0x20
+#define CFG_CR2700 0x30
+#define R1MS_SHIFT 0
+#define R2MS_SHIFT 2
+#define R1MS_MASK (0x01 << (R1MS_SHIFT))
+#define R2MS_MASK (0x01 << (R2MS_SHIFT))
+#define R1DF_SHIFT 1
+#define R2DF_SHIFT 2
+#define R1DF_MASK (0x01 << (R1DF_SHIFT))
+#define R2DF_MASK (0x01 << (R2DF_SHIFT))
+#define R1FE_MASK 0x01
+#define R2FE_MASK 0x05
+#define TT1_SHIFT 0
+#define TT2_SHIFT 4
+#define TT_OFF 0
+#define TT_ON 1
+#define TT_MASK 7
+#define NATSEMI_MAN_ID 0x01
+#define LM95231_CHIP_ID 0xA1
+#define LM95241_CHIP_ID 0xA4
+
+static const u8 lm95241_reg_address[] = {
+ LM95241_REG_R_LOCAL_TEMPH,
+ LM95241_REG_R_LOCAL_TEMPL,
+ LM95241_REG_R_REMOTE1_TEMPH,
+ LM95241_REG_R_REMOTE1_TEMPL,
+ LM95241_REG_R_REMOTE2_TEMPH,
+ LM95241_REG_R_REMOTE2_TEMPL
+};
+
+/* Client data (each client gets its own) */
+struct lm95241_data {
+ struct device *hwmon_dev;
+ struct mutex update_lock;
+ unsigned long last_updated, interval; /* in jiffies */
+ char valid; /* zero until following fields are valid */
+ /* registers values */
+ u8 temp[ARRAY_SIZE(lm95241_reg_address)];
+ u8 config, model, trutherm;
+};
+
+/* Conversions */
+static int temp_from_reg_signed(u8 val_h, u8 val_l)
+{
+ s16 val_hl = (val_h << 8) | val_l;
+ return val_hl * 1000 / 256;
+}
+
+static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
+{
+ u16 val_hl = (val_h << 8) | val_l;
+ return val_hl * 1000 / 256;
+}
+
+static struct lm95241_data *lm95241_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + data->interval) ||
+ !data->valid) {
+ int i;
+
+ dev_dbg(&client->dev, "Updating lm95241 data.\n");
+ for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
+ data->temp[i]
+ = i2c_smbus_read_byte_data(client,
+ lm95241_reg_address[i]);
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
+/* Sysfs stuff */
+static ssize_t show_input(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct lm95241_data *data = lm95241_update_device(dev);
+ int index = to_sensor_dev_attr(attr)->index;
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n",
+ index == 0 || (data->config & (1 << (index / 2))) ?
+ temp_from_reg_signed(data->temp[index], data->temp[index + 1]) :
+ temp_from_reg_unsigned(data->temp[index],
+ data->temp[index + 1]));
+}
+
+static ssize_t show_type(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ return snprintf(buf, PAGE_SIZE - 1,
+ data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n");
+}
+
+static ssize_t set_type(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+ unsigned long val;
+ int shift;
+ u8 mask = to_sensor_dev_attr(attr)->index;
+
+ if (kstrtoul(buf, 10, &val) < 0)
+ return -EINVAL;
+ if (val != 1 && val != 2)
+ return -EINVAL;
+
+ shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT;
+
+ mutex_lock(&data->update_lock);
+
+ data->trutherm &= ~(TT_MASK << shift);
+ if (val == 1) {
+ data->model |= mask;
+ data->trutherm |= (TT_ON << shift);
+ } else {
+ data->model &= ~mask;
+ data->trutherm |= (TT_OFF << shift);
+ }
+ data->valid = 0;
+
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
+ data->model);
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
+ data->trutherm);
+
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t show_min(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ return snprintf(buf, PAGE_SIZE - 1,
+ data->config & to_sensor_dev_attr(attr)->index ?
+ "-127000\n" : "0\n");
+}
+
+static ssize_t set_min(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+ long val;
+
+ if (kstrtol(buf, 10, &val) < 0)
+ return -EINVAL;
+ if (val < -128000)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+
+ if (val < 0)
+ data->config |= to_sensor_dev_attr(attr)->index;
+ else
+ data->config &= ~to_sensor_dev_attr(attr)->index;
+ data->valid = 0;
+
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
+
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t show_max(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ return snprintf(buf, PAGE_SIZE - 1,
+ data->config & to_sensor_dev_attr(attr)->index ?
+ "127000\n" : "255000\n");
+}
+
+static ssize_t set_max(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+ long val;
+
+ if (kstrtol(buf, 10, &val) < 0)
+ return -EINVAL;
+ if (val >= 256000)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+
+ if (val <= 127000)
+ data->config |= to_sensor_dev_attr(attr)->index;
+ else
+ data->config &= ~to_sensor_dev_attr(attr)->index;
+ data->valid = 0;
+
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
+
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct lm95241_data *data = lm95241_update_device(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval
+ / HZ);
+}
+
+static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+ unsigned long val;
+
+ if (kstrtoul(buf, 10, &val) < 0)
+ return -EINVAL;
+
+ data->interval = val * HZ / 1000;
+
+ return count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
+ R1MS_MASK);
+static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
+ R2MS_MASK);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min,
+ R1DF_MASK);
+static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min,
+ R2DF_MASK);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max,
+ R1DF_MASK);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max,
+ R2DF_MASK);
+static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
+ set_interval);
+
+static struct attribute *lm95241_attributes[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_type.dev_attr.attr,
+ &sensor_dev_attr_temp3_type.dev_attr.attr,
+ &sensor_dev_attr_temp2_min.dev_attr.attr,
+ &sensor_dev_attr_temp3_min.dev_attr.attr,
+ &sensor_dev_attr_temp2_max.dev_attr.attr,
+ &sensor_dev_attr_temp3_max.dev_attr.attr,
+ &dev_attr_update_interval.attr,
+ NULL
+};
+
+static const struct attribute_group lm95241_group = {
+ .attrs = lm95241_attributes,
+};
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm95241_detect(struct i2c_client *new_client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = new_client->adapter;
+ const char *name;
+ int mfg_id, chip_id;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
+ if (mfg_id != NATSEMI_MAN_ID)
+ return -ENODEV;
+
+ chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
+ switch (chip_id) {
+ case LM95231_CHIP_ID:
+ name = "lm95231";
+ break;
+ case LM95241_CHIP_ID:
+ name = "lm95241";
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ /* Fill the i2c board info */
+ strlcpy(info->type, name, I2C_NAME_SIZE);
+ return 0;
+}
+
+static void lm95241_init_client(struct i2c_client *client)
+{
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ data->interval = HZ; /* 1 sec default */
+ data->valid = 0;
+ data->config = CFG_CR0076;
+ data->model = 0;
+ data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
+
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
+ R1FE_MASK | R2FE_MASK);
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
+ data->trutherm);
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
+ data->model);
+}
+
+static int lm95241_probe(struct i2c_client *new_client,
+ const struct i2c_device_id *id)
+{
+ struct lm95241_data *data;
+ int err;
+
+ data = kzalloc(sizeof(struct lm95241_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ i2c_set_clientdata(new_client, data);
+ mutex_init(&data->update_lock);
+
+ /* Initialize the LM95241 chip */
+ lm95241_init_client(new_client);
+
+ /* Register sysfs hooks */
+ err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group);
+ if (err)
+ 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;
+ }
+
+ return 0;
+
+exit_remove_files:
+ sysfs_remove_group(&new_client->dev.kobj, &lm95241_group);
+exit_free:
+ kfree(data);
+exit:
+ return err;
+}
+
+static int lm95241_remove(struct i2c_client *client)
+{
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &lm95241_group);
+
+ kfree(data);
+ return 0;
+}
+
+/* Driver data (common to all clients) */
+static const struct i2c_device_id lm95241_id[] = {
+ { "lm95231", 0 },
+ { "lm95241", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lm95241_id);
+
+static struct i2c_driver lm95241_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = DEVNAME,
+ },
+ .probe = lm95241_probe,
+ .remove = lm95241_remove,
+ .id_table = lm95241_id,
+ .detect = lm95241_detect,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(lm95241_driver);
+
+MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
+MODULE_DESCRIPTION("LM95241 sensor driver");
+MODULE_LICENSE("GPL");