hwmon: (lm73) Add 'update_interval' attribute

The LM73 supports four A/D conversion resolutions.  The default used by
the existing lm73 driver is the chip's default, 11-bit (0.25 C/LSB).
This patch enables changing of this resolution from userspace via the
update_interval sysfs attribute.  Full details on usage are included in
Documentation/hwmon/lm73.

Signed-off-by: Chris Verges <[email protected]>
[[email protected]: cleanup]
Signed-off-by: Guenter Roeck <[email protected]>

drivers/hwmon/lm73.c

@@ -39,8 +39,24 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
 #define LM73_TEMP_MIN		(-256000 / 250)
 #define LM73_TEMP_MAX		(255750 / 250)
 
-/*-----------------------------------------------------------------------*/
+#define LM73_CTRL_RES_SHIFT	5
+#define LM73_CTRL_RES_MASK	(BIT(5) | BIT(6))
+#define LM73_CTRL_TO_MASK	BIT(7)
 
+static const unsigned short lm73_convrates[] = {
+	14,	/* 11-bits (0.25000 C/LSB): RES1 Bit = 0, RES0 Bit = 0 */
+	28,	/* 12-bits (0.12500 C/LSB): RES1 Bit = 0, RES0 Bit = 1 */
+	56,	/* 13-bits (0.06250 C/LSB): RES1 Bit = 1, RES0 Bit = 0 */
+	112,	/* 14-bits (0.03125 C/LSB): RES1 Bit = 1, RES0 Bit = 1 */
+};
+
+struct lm73_data {
+	struct device *hwmon_dev;
+	struct mutex lock;
+	u8 ctrl;			/* control register value */
+};
+
+/*-----------------------------------------------------------------------*/
 
 static ssize_t set_temp(struct device *dev, struct device_attribute *da,
 			const char *buf, size_t count)
@@ -78,6 +94,51 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *da,
 	return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
 }
 
+static ssize_t set_convrate(struct device *dev, struct device_attribute *da,
+			    const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct lm73_data *data = i2c_get_clientdata(client);
+	unsigned long convrate;
+	s32 err;
+	int res = 0;
+
+	err = kstrtoul(buf, 10, &convrate);
+	if (err < 0)
+		return err;
+
+	/*
+	 * Convert the desired conversion rate into register bits.
+	 * res is already initialized, and everything past the second-to-last
+	 * value in the array is treated as belonging to the last value
+	 * in the array.
+	 */
+	while (res < (ARRAY_SIZE(lm73_convrates) - 1) &&
+			convrate > lm73_convrates[res])
+		res++;
+
+	mutex_lock(&data->lock);
+	data->ctrl &= LM73_CTRL_TO_MASK;
+	data->ctrl |= res << LM73_CTRL_RES_SHIFT;
+	err = i2c_smbus_write_byte_data(client, LM73_REG_CTRL, data->ctrl);
+	mutex_unlock(&data->lock);
+
+	if (err < 0)
+		return err;
+
+	return count;
+}
+
+static ssize_t show_convrate(struct device *dev, struct device_attribute *da,
+			     char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct lm73_data *data = i2c_get_clientdata(client);
+	int res;
+
+	res = (data->ctrl & LM73_CTRL_RES_MASK) >> LM73_CTRL_RES_SHIFT;
+	return scnprintf(buf, PAGE_SIZE, "%hu\n", lm73_convrates[res]);
+}
 
 /*-----------------------------------------------------------------------*/
 
@@ -89,13 +150,14 @@ static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
 			show_temp, set_temp, LM73_REG_MIN);
 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
 			show_temp, NULL, LM73_REG_INPUT);
-
+static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
+			show_convrate, set_convrate, 0);
 
 static struct attribute *lm73_attributes[] = {
 	&sensor_dev_attr_temp1_input.dev_attr.attr,
 	&sensor_dev_attr_temp1_max.dev_attr.attr,
 	&sensor_dev_attr_temp1_min.dev_attr.attr,
-
+	&sensor_dev_attr_update_interval.dev_attr.attr,
 	NULL
 };
 
@@ -110,23 +172,36 @@ static const struct attribute_group lm73_group = {
 static int
 lm73_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
-	struct device *hwmon_dev;
 	int status;
+	struct lm73_data *data;
+	int ctrl;
+
+	data = devm_kzalloc(&client->dev, sizeof(struct lm73_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->lock);
+
+	ctrl = i2c_smbus_read_byte_data(client, LM73_REG_CTRL);
+	if (ctrl < 0)
+		return ctrl;
+	data->ctrl = ctrl;
 
 	/* Register sysfs hooks */
 	status = sysfs_create_group(&client->dev.kobj, &lm73_group);
 	if (status)
 		return status;
 
-	hwmon_dev = hwmon_device_register(&client->dev);
-	if (IS_ERR(hwmon_dev)) {
-		status = PTR_ERR(hwmon_dev);
+	data->hwmon_dev = hwmon_device_register(&client->dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		status = PTR_ERR(data->hwmon_dev);
 		goto exit_remove;
 	}
-	i2c_set_clientdata(client, hwmon_dev);
 
 	dev_info(&client->dev, "%s: sensor '%s'\n",
-		 dev_name(hwmon_dev), client->name);
+		 dev_name(data->hwmon_dev), client->name);
 
 	return 0;
 
@@ -137,9 +212,9 @@ exit_remove:
 
 static int lm73_remove(struct i2c_client *client)
 {
-	struct device *hwmon_dev = i2c_get_clientdata(client);
+	struct lm73_data *data = i2c_get_clientdata(client);
 
-	hwmon_device_unregister(hwmon_dev);
+	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&client->dev.kobj, &lm73_group);
 	return 0;
 }