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path: root/drivers/hwmon/nct1008.c
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Diffstat (limited to 'drivers/hwmon/nct1008.c')
-rw-r--r--drivers/hwmon/nct1008.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/hwmon/nct1008.c b/drivers/hwmon/nct1008.c
new file mode 100644
index 000000000000..bc82da400035
--- /dev/null
+++ b/drivers/hwmon/nct1008.c
@@ -0,0 +1,271 @@
+/*
+ * drivers/hwmon/nct1008.c
+ *
+ * Temperature Sensor driver for NCT1008 Temperature Monitor chip
+ * manufactured by ON Semiconductors (www.onsemi.com).
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/i2c/nct1008.h>
+#include <linux/hwmon.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+
+#define NCT1008_LOCAL_TEMP_RD 0x00
+#define NCT1008_CONFIG_RD 0x03
+#define NCT1008_MFR_ID_RD 0xFE
+
+#define NCT1008_CONFIG_WR 0x09
+#define NCT1008_CONV_RATE_WR 0x0A
+#define NCT1008_OFFSET_WR 0x11
+#define NCT1008_LOCAL_THERM_LIMIT_WR 0x20
+
+#define DRIVER_NAME "nct1008"
+
+struct nct1008_data {
+ struct device *hwmon_dev;
+ struct i2c_client *client;
+ struct nct1008_platform_data plat_data;
+};
+
+static ssize_t nct1008_show_temp(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ signed int temp_value = 0;
+ u8 data = 0;
+
+ if (!dev || !buf || !attr)
+ return -EINVAL;
+
+ data = i2c_smbus_read_byte_data(client, NCT1008_LOCAL_TEMP_RD);
+ if (data < 0) {
+ dev_err(&client->dev, "%s: failed to read "
+ "temperature\n", __func__);
+ return -EINVAL;
+ }
+
+ temp_value = (signed int)data;
+ return sprintf(buf, "%d\n", temp_value);
+}
+
+static DEVICE_ATTR(temperature, S_IRUGO, nct1008_show_temp, NULL);
+
+static struct attribute *nct1008_attributes[] = {
+ &dev_attr_temperature.attr,
+ NULL
+};
+
+static const struct attribute_group nct1008_attr_group = {
+ .attrs = nct1008_attributes,
+};
+
+static int __devinit nct1008_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct nct1008_data *pdata;
+ int err;
+ u8 data = 0;
+
+ if (client->dev.platform_data == NULL) {
+ dev_err(&client->dev, "platform data is NULL, exiting\n");
+ return -ENODEV;
+ }
+
+ pdata = kzalloc(sizeof(struct nct1008_data), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(&client->dev, "%s: failed to allocate "
+ "device\n", __func__);
+ return -ENOMEM;
+ }
+
+ pdata->client = client;
+ i2c_set_clientdata(client, pdata);
+
+ memcpy(&pdata->plat_data, client->dev.platform_data,
+ sizeof(struct nct1008_platform_data));
+
+ data = i2c_smbus_read_byte_data(client, NCT1008_MFR_ID_RD);
+ if (data < 0) {
+ dev_err(&client->dev, "%s: failed to read manufacturer "
+ "id\n", __func__);
+ err = data;
+ goto fail_alloc;
+ }
+ dev_info(&client->dev, "%s:0x%x chip found\n", client->name, data);
+
+ /* set conversion rate (conv/sec) */
+ data = pdata->plat_data.conv_rate;
+ err = i2c_smbus_write_byte_data(client, NCT1008_CONV_RATE_WR, data);
+ if (err < 0) {
+ dev_err(&client->dev, "%s: failed to set conversion "
+ "rate\n", __func__);
+ goto fail_alloc;
+ }
+
+ /* set config params */
+ data = pdata->plat_data.config;
+ err = i2c_smbus_write_byte_data(client, NCT1008_CONFIG_WR, data);
+ if (err < 0) {
+ dev_err(&client->dev, "%s: failed to set config\n", __func__);
+ goto fail_alloc;
+ }
+
+ /* set offset value */
+ data = pdata->plat_data.offset;
+ err = i2c_smbus_write_byte_data(client, NCT1008_OFFSET_WR, data);
+ if (err < 0) {
+ dev_err(&client->dev,
+ "%s: failed to set offset\n", __func__);
+ goto fail_alloc;
+ }
+
+ /* set cpu shutdown threshold */
+ data = pdata->plat_data.thermal_threshold;
+ err = i2c_smbus_write_byte_data(client, NCT1008_LOCAL_THERM_LIMIT_WR, data);
+ if (err < 0) {
+ dev_err(&client->dev,
+ "%s: failed to set THERM# limit\n", __func__);
+ goto fail_alloc;
+ }
+
+ pdata->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(pdata->hwmon_dev)) {
+ err = PTR_ERR(pdata->hwmon_dev);
+ dev_err(&client->dev, "%s: hwmon_device_register "
+ "failed\n", __func__);
+ goto fail_alloc;
+ }
+
+ /* register sysfs hooks */
+ err = sysfs_create_group(&client->dev.kobj, &nct1008_attr_group);
+ if (err < 0)
+ goto fail_sys;
+
+ dev_info(&client->dev, "%s: initialized\n", __func__);
+ return 0;
+
+fail_sys:
+ hwmon_device_unregister(pdata->hwmon_dev);
+fail_alloc:
+ kfree(pdata);
+ return err;
+}
+
+static int __devexit nct1008_remove(struct i2c_client *client)
+{
+ struct nct1008_data *pdata = i2c_get_clientdata(client);
+
+ if (!pdata)
+ return -EINVAL;
+
+ hwmon_device_unregister(pdata->hwmon_dev);
+ kfree(pdata);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int nct1008_suspend(struct i2c_client *client, pm_message_t state)
+{
+ u8 config;
+ int err;
+
+ config = i2c_smbus_read_byte_data(client, NCT1008_CONFIG_RD);
+ if (config < 0) {
+ dev_err(&client->dev, "%s: failed to read config\n", __func__);
+ return -EIO;
+ }
+
+ /* take device to standby state */
+ config |= NCT1008_CONFIG_RUN_STANDBY;
+
+ err = i2c_smbus_write_byte_data(client, NCT1008_CONFIG_WR, config);
+ if (err < 0) {
+ dev_err(&client->dev, "%s: failed to set config\n", __func__);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int nct1008_resume(struct i2c_client *client)
+{
+ u8 config = 0;
+ int err;
+
+ config = i2c_smbus_read_byte_data(client, NCT1008_CONFIG_RD);
+ if (config < 0) {
+ dev_err(&client->dev, "%s: failed to read config\n", __func__);
+ return -EIO;
+ }
+
+ /* take device out of standby state */
+ config &= ~NCT1008_CONFIG_RUN_STANDBY;
+
+ err = i2c_smbus_write_byte_data(client, NCT1008_CONFIG_WR, config);
+ if (err < 0) {
+ dev_err(&client->dev, "%s: failed to set config\n", __func__);
+ return -EIO;
+ }
+ return 0;
+}
+#endif
+
+static const struct i2c_device_id nct1008_id[] = {
+ { DRIVER_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, nct1008_id);
+
+static struct i2c_driver nct1008_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+ .probe = nct1008_probe,
+ .remove = __devexit_p(nct1008_remove),
+ .id_table = nct1008_id,
+#ifdef CONFIG_PM
+ .suspend = nct1008_suspend,
+ .resume = nct1008_resume,
+#endif
+};
+
+static int __init nct1008_init(void)
+{
+ return i2c_add_driver(&nct1008_driver);
+}
+
+static void __exit nct1008_exit(void)
+{
+ i2c_del_driver(&nct1008_driver);
+}
+
+module_init (nct1008_init);
+module_exit (nct1008_exit);
+
+#define DRIVER_DESC "NCT1008 temperature sensor driver"
+#define DRIVER_LICENSE "GPL"
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE(DRIVER_LICENSE);
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-08 10:51:16 +0000