hwmon: (max1111) Add support for MAX1110, MAX1112, and MAX1113

MAX1110 is similar to MAX1111, with 8 instead of 4 channels. MAX1112 and MAX1113
are similar to MAX1110 and MAX1111, with 4.096V reference voltage instead of
2.048V.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/Kconfig

@@ -770,10 +770,11 @@ config SENSORS_LM95245
 	  will be called lm95245.
 
 config SENSORS_MAX1111
-	tristate "Maxim MAX1111 Multichannel, Serial 8-bit ADC chip"
+	tristate "Maxim MAX1111 Serial 8-bit ADC chip and compatibles"
 	depends on SPI_MASTER
 	help
-	  Say y here to support Maxim's MAX1111 ADC chips.
+	  Say y here to support Maxim's MAX1110, MAX1111, MAX1112, and MAX1113
+	  ADC chips.
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called max1111.

drivers/hwmon/max1111.c

@@ -22,6 +22,8 @@
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
 
+enum chips { max1110, max1111, max1112, max1113 };
+
 #define MAX1111_TX_BUF_SIZE	1
 #define MAX1111_RX_BUF_SIZE	2
 
@@ -30,6 +32,7 @@
 #define MAX1111_CTRL_PD1      (1u << 1)
 #define MAX1111_CTRL_SGL      (1u << 2)
 #define MAX1111_CTRL_UNI      (1u << 3)
+#define MAX1110_CTRL_SEL_SH   (4)
 #define MAX1111_CTRL_SEL_SH   (5)	/* NOTE: bit 4 is ignored */
 #define MAX1111_CTRL_STR      (1u << 7)
 
@@ -42,6 +45,8 @@ struct max1111_data {
 	uint8_t rx_buf[MAX1111_RX_BUF_SIZE];
 	struct mutex		drvdata_lock;
 	/* protect msg, xfer and buffers from multiple access */
+	int			sel_sh;
+	int			lsb;
 };
 
 static int max1111_read(struct device *dev, int channel)
@@ -53,7 +58,7 @@ static int max1111_read(struct device *dev, int channel)
 	/* writing to drvdata struct is not thread safe, wait on mutex */
 	mutex_lock(&data->drvdata_lock);
 
-	data->tx_buf[0] = (channel << MAX1111_CTRL_SEL_SH) |
+	data->tx_buf[0] = (channel << data->sel_sh) |
 		MAX1111_CTRL_PD0 | MAX1111_CTRL_PD1 |
 		MAX1111_CTRL_SGL | MAX1111_CTRL_UNI | MAX1111_CTRL_STR;
 
@@ -93,12 +98,13 @@ EXPORT_SYMBOL(max1111_read_channel);
 static ssize_t show_name(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "max1111\n");
+	return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);
 }
 
 static ssize_t show_adc(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
+	struct max1111_data *data = dev_get_drvdata(dev);
 	int channel = to_sensor_dev_attr(attr)->index;
 	int ret;
 
@@ -107,10 +113,10 @@ static ssize_t show_adc(struct device *dev,
 		return ret;
 
 	/*
-	 * assume the reference voltage to be 2.048V, with an 8-bit sample,
-	 * the LSB weight is 8mV
+	 * Assume the reference voltage to be 2.048V or 4.096V, with an 8-bit
+	 * sample. The LSB weight is 8mV or 16mV depending on the chip type.
 	 */
-	return sprintf(buf, "%d\n", ret * 8);
+	return sprintf(buf, "%d\n", ret * data->lsb);
 }
 
 #define MAX1111_ADC_ATTR(_id)		\
@@ -121,6 +127,10 @@ static MAX1111_ADC_ATTR(0);
 static MAX1111_ADC_ATTR(1);
 static MAX1111_ADC_ATTR(2);
 static MAX1111_ADC_ATTR(3);
+static MAX1111_ADC_ATTR(4);
+static MAX1111_ADC_ATTR(5);
+static MAX1111_ADC_ATTR(6);
+static MAX1111_ADC_ATTR(7);
 
 static struct attribute *max1111_attributes[] = {
 	&dev_attr_name.attr,
@@ -135,6 +145,18 @@ static const struct attribute_group max1111_attr_group = {
 	.attrs	= max1111_attributes,
 };
 
+static struct attribute *max1110_attributes[] = {
+	&sensor_dev_attr_in4_input.dev_attr.attr,
+	&sensor_dev_attr_in5_input.dev_attr.attr,
+	&sensor_dev_attr_in6_input.dev_attr.attr,
+	&sensor_dev_attr_in7_input.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group max1110_attr_group = {
+	.attrs	= max1110_attributes,
+};
+
 static int __devinit setup_transfer(struct max1111_data *data)
 {
 	struct spi_message *m;
@@ -159,6 +181,7 @@ static int __devinit setup_transfer(struct max1111_data *data)
 
 static int __devinit max1111_probe(struct spi_device *spi)
 {
+	enum chips chip = spi_get_device_id(spi)->driver_data;
 	struct max1111_data *data;
 	int err;
 
@@ -174,6 +197,24 @@ static int __devinit max1111_probe(struct spi_device *spi)
 		return -ENOMEM;
 	}
 
+	switch (chip) {
+	case max1110:
+		data->lsb = 8;
+		data->sel_sh = MAX1110_CTRL_SEL_SH;
+		break;
+	case max1111:
+		data->lsb = 8;
+		data->sel_sh = MAX1111_CTRL_SEL_SH;
+		break;
+	case max1112:
+		data->lsb = 16;
+		data->sel_sh = MAX1110_CTRL_SEL_SH;
+		break;
+	case max1113:
+		data->lsb = 16;
+		data->sel_sh = MAX1111_CTRL_SEL_SH;
+		break;
+	}
 	err = setup_transfer(data);
 	if (err)
 		return err;
@@ -188,6 +229,14 @@ static int __devinit max1111_probe(struct spi_device *spi)
 		dev_err(&spi->dev, "failed to create attribute group\n");
 		return err;
 	}
+	if (chip == max1110 || chip == max1112) {
+		err = sysfs_create_group(&spi->dev.kobj, &max1110_attr_group);
+		if (err) {
+			dev_err(&spi->dev,
+				"failed to create extended attribute group\n");
+			goto err_remove;
+		}
+	}
 
 	data->hwmon_dev = hwmon_device_register(&spi->dev);
 	if (IS_ERR(data->hwmon_dev)) {
@@ -202,6 +251,7 @@ static int __devinit max1111_probe(struct spi_device *spi)
 	return 0;
 
 err_remove:
+	sysfs_remove_group(&spi->dev.kobj, &max1110_attr_group);
 	sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
 	return err;
 }
@@ -211,16 +261,27 @@ static int __devexit max1111_remove(struct spi_device *spi)
 	struct max1111_data *data = spi_get_drvdata(spi);
 
 	hwmon_device_unregister(data->hwmon_dev);
+	sysfs_remove_group(&spi->dev.kobj, &max1110_attr_group);
 	sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
 	mutex_destroy(&data->drvdata_lock);
 	return 0;
 }
 
+static const struct spi_device_id max1111_ids[] = {
+	{ "max1110", max1110 },
+	{ "max1111", max1111 },
+	{ "max1112", max1112 },
+	{ "max1113", max1113 },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, max1111_ids);
+
 static struct spi_driver max1111_driver = {
 	.driver		= {
 		.name	= "max1111",
 		.owner	= THIS_MODULE,
 	},
+	.id_table	= max1111_ids,
 	.probe		= max1111_probe,
 	.remove		= __devexit_p(max1111_remove),
 };
@@ -228,6 +289,5 @@ static struct spi_driver max1111_driver = {
 module_spi_driver(max1111_driver);
 
 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
-MODULE_DESCRIPTION("MAX1111 ADC Driver");
+MODULE_DESCRIPTION("MAX1110/MAX1111/MAX1112/MAX1113 ADC Driver");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS("spi:max1111");