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Commit 9224c38a authored by Guenter Roeck's avatar Guenter Roeck
Browse files

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: default avatarGuenter Roeck <linux@roeck-us.net>
Acked-by: default avatarJean Delvare <khali@linux-fr.org>
parent a86e94dc

drivers/hwmon/Kconfig

+3 −2
Original line number Diff line number Diff line
@@ -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

+67 −7
Original line number Diff line number Diff line
@@ -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");