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@xxxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 5 +--
drivers/hwmon/max1111.c | 83 +++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 79 insertions(+), 9 deletions(-)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 8343cad..148903c 100644
--- a/drivers/hwmon/Kconfig
+++ b/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 MAX1111, MAX1112, MAX1112, and MAX1113
+ ADC chips.
This driver can also be built as a module. If so, the module
will be called max1111.
diff --git a/drivers/hwmon/max1111.c b/drivers/hwmon/max1111.c
index f3978a4..5bf081d 100644
--- a/drivers/hwmon/max1111.c
+++ b/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
@@ -30,10 +32,12 @@
#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)
struct max1111_data {
+ const char *name;
struct spi_device *spi;
struct device *hwmon_dev;
struct spi_message msg;
@@ -42,6 +46,9 @@ 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;
+ enum chips chip;
};
static int max1111_read(struct device *dev, int channel)
@@ -53,7 +60,7 @@ 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 +100,15 @@ EXPORT_SYMBOL(max1111_read_channel);
static ssize_t show_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "max1111\n");
+ struct max1111_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", data->name);
}
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 +117,10 @@ 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 +131,10 @@ 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 +149,18 @@ 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 +185,7 @@ 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 +201,29 @@ static int __devinit max1111_probe(struct spi_device *spi)
return -ENOMEM;
}
+ data->chip = chip;
+ switch (chip) {
+ case max1110:
+ data->name = "mmax1110";
+ data->lsb = 8;
+ data->sel_sh = MAX1110_CTRL_SEL_SH;
+ break;
+ case max1111:
+ data->name = "max1111";
+ data->lsb = 8;
+ data->sel_sh = MAX1111_CTRL_SEL_SH;
+ break;
+ case max1112:
+ data->name = "max1112";
+ data->lsb = 16;
+ data->sel_sh = MAX1110_CTRL_SEL_SH;
+ break;
+ case max1113:
+ data->name = "max1113";
+ data->lsb = 16;
+ data->sel_sh = MAX1111_CTRL_SEL_SH;
+ break;
+ }
err = setup_transfer(data);
if (err)
return err;
@@ -188,6 +238,13 @@ 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 attribute group\n");
+ goto err_remove1;
+ }
+ }
data->hwmon_dev = hwmon_device_register(&spi->dev);
if (IS_ERR(data->hwmon_dev)) {
@@ -202,6 +259,8 @@ static int __devinit max1111_probe(struct spi_device *spi)
return 0;
err_remove:
+ sysfs_remove_group(&spi->dev.kobj, &max1110_attr_group);
+err_remove1:
sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
return err;
}
@@ -211,16 +270,27 @@ 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 +298,5 @@ static struct spi_driver max1111_driver = {
module_spi_driver(max1111_driver);
MODULE_AUTHOR("Eric Miao <eric.miao@xxxxxxxxxxx>");
-MODULE_DESCRIPTION("MAX1111 ADC Driver");
+MODULE_DESCRIPTION("MAX1110/MAX1111/MAX1112/MAX1113 ADC Driver");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("spi:max1111");
--
1.7.9.7
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