Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 285 insertions, 0 deletions

diff --git a/drivers/hwmon/w83l785ts.c b/drivers/hwmon/w83l785ts.c
new file mode 100644
index 000000000..656a77102
--- /dev/null
+++ b/drivers/hwmon/w83l785ts.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware
+ *               monitoring
+ * Copyright (C) 2003-2009  Jean Delvare <jdelvare@suse.de>
+ *
+ * Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made
+ * by Winbond. It reports a single external temperature with a 1 deg
+ * resolution and a 3 deg accuracy. Datasheet can be obtained from
+ * Winbond's website at:
+ *   http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf
+ *
+ * Ported to Linux 2.6 by Wolfgang Ziegler <nuppla@gmx.at> and Jean Delvare
+ * <jdelvare@suse.de>.
+ *
+ * Thanks to James Bolt <james@evilpenguin.com> for benchmarking the read
+ * error handling mechanism.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.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>
+
+/* How many retries on register read error */
+#define MAX_RETRIES	5
+
+/*
+ * Address to scan
+ * Address is fully defined internally and cannot be changed.
+ */
+
+static const unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END };
+
+/*
+ * The W83L785TS-S registers
+ * Manufacturer ID is 0x5CA3 for Winbond.
+ */
+
+#define W83L785TS_REG_MAN_ID1		0x4D
+#define W83L785TS_REG_MAN_ID2		0x4C
+#define W83L785TS_REG_CHIP_ID		0x4E
+#define W83L785TS_REG_CONFIG		0x40
+#define W83L785TS_REG_TYPE		0x52
+#define W83L785TS_REG_TEMP		0x27
+#define W83L785TS_REG_TEMP_OVER		0x53 /* not sure about this one */
+
+/*
+ * Conversions
+ * The W83L785TS-S uses signed 8-bit values.
+ */
+
+#define TEMP_FROM_REG(val)	((val) * 1000)
+
+/*
+ * Functions declaration
+ */
+
+static int w83l785ts_probe(struct i2c_client *client);
+static int w83l785ts_detect(struct i2c_client *client,
+			    struct i2c_board_info *info);
+static int w83l785ts_remove(struct i2c_client *client);
+static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval);
+static struct w83l785ts_data *w83l785ts_update_device(struct device *dev);
+
+/*
+ * Driver data (common to all clients)
+ */
+
+static const struct i2c_device_id w83l785ts_id[] = {
+	{ "w83l785ts", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, w83l785ts_id);
+
+static struct i2c_driver w83l785ts_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "w83l785ts",
+	},
+	.probe_new	= w83l785ts_probe,
+	.remove		= w83l785ts_remove,
+	.id_table	= w83l785ts_id,
+	.detect		= w83l785ts_detect,
+	.address_list	= normal_i2c,
+};
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct w83l785ts_data {
+	struct device *hwmon_dev;
+	struct mutex update_lock;
+	char valid; /* zero until following fields are valid */
+	unsigned long last_updated; /* in jiffies */
+
+	/* registers values */
+	s8 temp[2]; /* 0: input, 1: critical limit */
+};
+
+/*
+ * Sysfs stuff
+ */
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
+	char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct w83l785ts_data *data = w83l785ts_update_device(dev);
+	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1);
+
+/*
+ * Real code
+ */
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int w83l785ts_detect(struct i2c_client *client,
+			    struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	u16 man_id;
+	u8 chip_id;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	/* detection */
+	if ((w83l785ts_read_value(client, W83L785TS_REG_CONFIG, 0) & 0x80)
+	 || (w83l785ts_read_value(client, W83L785TS_REG_TYPE, 0) & 0xFC)) {
+		dev_dbg(&adapter->dev,
+			"W83L785TS-S detection failed at 0x%02x\n",
+			client->addr);
+		return -ENODEV;
+	}
+
+	/* Identification */
+	man_id = (w83l785ts_read_value(client, W83L785TS_REG_MAN_ID1, 0) << 8)
+	       + w83l785ts_read_value(client, W83L785TS_REG_MAN_ID2, 0);
+	chip_id = w83l785ts_read_value(client, W83L785TS_REG_CHIP_ID, 0);
+
+	if (man_id != 0x5CA3		/* Winbond */
+	 || chip_id != 0x70) {		/* W83L785TS-S */
+		dev_dbg(&adapter->dev,
+			"Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
+			man_id, chip_id);
+		return -ENODEV;
+	}
+
+	strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static int w83l785ts_probe(struct i2c_client *client)
+{
+	struct w83l785ts_data *data;
+	struct device *dev = &client->dev;
+	int err;
+
+	data = devm_kzalloc(dev, sizeof(struct w83l785ts_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->update_lock);
+
+	/*
+	 * Initialize the W83L785TS chip
+	 * Nothing yet, assume it is already started.
+	 */
+
+	err = device_create_file(dev, &sensor_dev_attr_temp1_input.dev_attr);
+	if (err)
+		return err;
+
+	err = device_create_file(dev, &sensor_dev_attr_temp1_max.dev_attr);
+	if (err)
+		goto exit_remove;
+
+	/* Register sysfs hooks */
+	data->hwmon_dev = hwmon_device_register(dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		err = PTR_ERR(data->hwmon_dev);
+		goto exit_remove;
+	}
+
+	return 0;
+
+exit_remove:
+	device_remove_file(dev, &sensor_dev_attr_temp1_input.dev_attr);
+	device_remove_file(dev, &sensor_dev_attr_temp1_max.dev_attr);
+	return err;
+}
+
+static int w83l785ts_remove(struct i2c_client *client)
+{
+	struct w83l785ts_data *data = i2c_get_clientdata(client);
+
+	hwmon_device_unregister(data->hwmon_dev);
+	device_remove_file(&client->dev,
+			   &sensor_dev_attr_temp1_input.dev_attr);
+	device_remove_file(&client->dev,
+			   &sensor_dev_attr_temp1_max.dev_attr);
+
+	return 0;
+}
+
+static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
+{
+	int value, i;
+	struct device *dev;
+	const char *prefix;
+
+	/*
+	 * We might be called during detection, at which point the client
+	 * isn't yet fully initialized, so we can't use dev_dbg on it
+	 */
+	if (i2c_get_clientdata(client)) {
+		dev = &client->dev;
+		prefix = "";
+	} else {
+		dev = &client->adapter->dev;
+		prefix = "w83l785ts: ";
+	}
+
+	/*
+	 * Frequent read errors have been reported on Asus boards, so we
+	 * retry on read errors. If it still fails (unlikely), return the
+	 * default value requested by the caller.
+	 */
+	for (i = 1; i <= MAX_RETRIES; i++) {
+		value = i2c_smbus_read_byte_data(client, reg);
+		if (value >= 0) {
+			dev_dbg(dev, "%sRead 0x%02x from register 0x%02x.\n",
+				prefix, value, reg);
+			return value;
+		}
+		dev_dbg(dev, "%sRead failed, will retry in %d.\n", prefix, i);
+		msleep(i);
+	}
+
+	dev_err(dev, "%sCouldn't read value from register 0x%02x.\n", prefix,
+		reg);
+	return defval;
+}
+
+static struct w83l785ts_data *w83l785ts_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct w83l785ts_data *data = i2c_get_clientdata(client);
+
+	mutex_lock(&data->update_lock);
+
+	if (!data->valid || time_after(jiffies, data->last_updated + HZ * 2)) {
+		dev_dbg(&client->dev, "Updating w83l785ts data.\n");
+		data->temp[0] = w83l785ts_read_value(client,
+				W83L785TS_REG_TEMP, data->temp[0]);
+		data->temp[1] = w83l785ts_read_value(client,
+				W83L785TS_REG_TEMP_OVER, data->temp[1]);
+
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+module_i2c_driver(w83l785ts_driver);
+
+MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
+MODULE_DESCRIPTION("W83L785TS-S driver");
+MODULE_LICENSE("GPL");