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path: root/drivers/staging/iio/adc/ad7291.c
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Diffstat (limited to 'drivers/staging/iio/adc/ad7291.c')
-rw-r--r--drivers/staging/iio/adc/ad7291.c217
1 files changed, 76 insertions, 141 deletions
diff --git a/drivers/staging/iio/adc/ad7291.c b/drivers/staging/iio/adc/ad7291.c
index d088c662d5cd..3fc79e582750 100644
--- a/drivers/staging/iio/adc/ad7291.c
+++ b/drivers/staging/iio/adc/ad7291.c
@@ -21,6 +21,8 @@
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
+#include "ad7291.h"
+
/*
* Simplified handling
*
@@ -39,33 +41,9 @@
#define AD7291_VOLTAGE 0x01
#define AD7291_T_SENSE 0x02
#define AD7291_T_AVERAGE 0x03
-#define AD7291_CH0_DATA_HIGH 0x04
-#define AD7291_CH0_DATA_LOW 0x05
-#define AD7291_CH0_HYST 0x06
-#define AD7291_CH1_DATA_HIGH 0x07
-#define AD7291_CH1_DATA_LOW 0x08
-#define AD7291_CH1_HYST 0x09
-#define AD7291_CH2_DATA_HIGH 0x0A
-#define AD7291_CH2_DATA_LOW 0x0B
-#define AD7291_CH2_HYST 0x0C
-#define AD7291_CH3_DATA_HIGH 0x0D
-#define AD7291_CH3_DATA_LOW 0x0E
-#define AD7291_CH3_HYST 0x0F
-#define AD7291_CH4_DATA_HIGH 0x10
-#define AD7291_CH4_DATA_LOW 0x11
-#define AD7291_CH4_HYST 0x12
-#define AD7291_CH5_DATA_HIGH 0x13
-#define AD7291_CH5_DATA_LOW 0x14
-#define AD7291_CH5_HYST 0x15
-#define AD7291_CH6_DATA_HIGH 0x16
-#define AD7291_CH6_DATA_LOW 0x17
-#define AD7291_CH6_HYST 0x18
-#define AD7291_CH7_DATA_HIGH 0x19
-#define AD7291_CH7_DATA_LOW 0x1A
-#define AD7291_CH7_HYST 0x2B
-#define AD7291_T_SENSE_HIGH 0x1C
-#define AD7291_T_SENSE_LOW 0x1D
-#define AD7291_T_SENSE_HYST 0x1E
+#define AD7291_DATA_HIGH(x) ((x) * 3 + 0x4)
+#define AD7291_DATA_LOW(x) ((x) * 3 + 0x5)
+#define AD7291_HYST(x) ((x) * 3 + 0x6)
#define AD7291_VOLTAGE_ALERT_STATUS 0x1F
#define AD7291_T_ALERT_STATUS 0x20
@@ -100,7 +78,6 @@
struct ad7291_chip_info {
struct i2c_client *client;
struct regulator *reg;
- u16 int_vref_mv;
u16 command;
u16 c_mask; /* Active voltage channels for events */
struct mutex state_lock;
@@ -111,45 +88,22 @@ static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data)
struct i2c_client *client = chip->client;
int ret = 0;
- ret = i2c_smbus_read_word_data(client, reg);
+ ret = i2c_smbus_read_word_swapped(client, reg);
if (ret < 0) {
dev_err(&client->dev, "I2C read error\n");
return ret;
}
- *data = swab16((u16)ret);
+ *data = ret;
return 0;
}
static int ad7291_i2c_write(struct ad7291_chip_info *chip, u8 reg, u16 data)
{
- return i2c_smbus_write_word_data(chip->client, reg, swab16(data));
-}
-
-static ssize_t ad7291_store_reset(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad7291_chip_info *chip = iio_priv(indio_dev);
-
- return ad7291_i2c_write(chip, AD7291_COMMAND,
- chip->command | AD7291_RESET);
+ return i2c_smbus_write_word_swapped(chip->client, reg, data);
}
-static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, ad7291_store_reset, 0);
-
-static struct attribute *ad7291_attributes[] = {
- &iio_dev_attr_reset.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad7291_attribute_group = {
- .attrs = ad7291_attributes,
-};
-
static irqreturn_t ad7291_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
@@ -255,31 +209,31 @@ static inline ssize_t ad7291_set_hyst(struct device *dev,
static IIO_DEVICE_ATTR(in_temp0_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
ad7291_show_hyst, ad7291_set_hyst,
- AD7291_T_SENSE_HYST);
+ AD7291_HYST(8));
static IIO_DEVICE_ATTR(in_voltage0_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
- ad7291_show_hyst, ad7291_set_hyst, AD7291_CH0_HYST);
+ ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(0));
static IIO_DEVICE_ATTR(in_voltage1_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
- ad7291_show_hyst, ad7291_set_hyst, AD7291_CH1_HYST);
+ ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(1));
static IIO_DEVICE_ATTR(in_voltage2_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
- ad7291_show_hyst, ad7291_set_hyst, AD7291_CH2_HYST);
+ ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(2));
static IIO_DEVICE_ATTR(in_voltage3_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
- ad7291_show_hyst, ad7291_set_hyst, AD7291_CH3_HYST);
+ ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(3));
static IIO_DEVICE_ATTR(in_voltage4_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
- ad7291_show_hyst, ad7291_set_hyst, AD7291_CH4_HYST);
+ ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(4));
static IIO_DEVICE_ATTR(in_voltage5_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
- ad7291_show_hyst, ad7291_set_hyst, AD7291_CH5_HYST);
+ ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(5));
static IIO_DEVICE_ATTR(in_voltage6_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
- ad7291_show_hyst, ad7291_set_hyst, AD7291_CH6_HYST);
+ ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(6));
static IIO_DEVICE_ATTR(in_voltage7_thresh_both_hyst_raw,
S_IRUGO | S_IWUSR,
- ad7291_show_hyst, ad7291_set_hyst, AD7291_CH7_HYST);
+ ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(7));
static struct attribute *ad7291_event_attributes[] = {
&iio_dev_attr_in_temp0_thresh_both_hyst_raw.dev_attr.attr,
@@ -294,53 +248,45 @@ static struct attribute *ad7291_event_attributes[] = {
NULL,
};
-/* high / low */
-static u8 ad7291_limit_regs[9][2] = {
- { AD7291_CH0_DATA_HIGH, AD7291_CH0_DATA_LOW },
- { AD7291_CH1_DATA_HIGH, AD7291_CH1_DATA_LOW },
- { AD7291_CH2_DATA_HIGH, AD7291_CH2_DATA_LOW },
- { AD7291_CH3_DATA_HIGH, AD7291_CH3_DATA_LOW }, /* FIXME: ? */
- { AD7291_CH4_DATA_HIGH, AD7291_CH4_DATA_LOW },
- { AD7291_CH5_DATA_HIGH, AD7291_CH5_DATA_LOW },
- { AD7291_CH6_DATA_HIGH, AD7291_CH6_DATA_LOW },
- { AD7291_CH7_DATA_HIGH, AD7291_CH7_DATA_LOW },
- /* temp */
- { AD7291_T_SENSE_HIGH, AD7291_T_SENSE_LOW },
-};
+static unsigned int ad7291_threshold_reg(u64 event_code)
+{
+ unsigned int offset;
+
+ switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) {
+ case IIO_VOLTAGE:
+ offset = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
+ break;
+ case IIO_TEMP:
+ offset = 8;
+ break;
+ default:
+ return 0;
+ }
+
+ if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_FALLING)
+ return AD7291_DATA_LOW(offset);
+ else
+ return AD7291_DATA_HIGH(offset);
+}
static int ad7291_read_event_value(struct iio_dev *indio_dev,
u64 event_code,
int *val)
{
struct ad7291_chip_info *chip = iio_priv(indio_dev);
-
int ret;
- u8 reg;
u16 uval;
- s16 signval;
+
+ ret = ad7291_i2c_read(chip, ad7291_threshold_reg(event_code), &uval);
+ if (ret < 0)
+ return ret;
switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) {
case IIO_VOLTAGE:
- reg = ad7291_limit_regs[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)]
- [!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING)];
-
- ret = ad7291_i2c_read(chip, reg, &uval);
- if (ret < 0)
- return ret;
*val = uval & AD7291_VALUE_MASK;
return 0;
-
case IIO_TEMP:
- reg = ad7291_limit_regs[8]
- [!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING)];
-
- ret = ad7291_i2c_read(chip, reg, &signval);
- if (ret < 0)
- return ret;
- signval = (s16)((signval & AD7291_VALUE_MASK) << 4) >> 4;
- *val = signval;
+ *val = sign_extend32(uval, 11);
return 0;
default:
return -EINVAL;
@@ -352,28 +298,21 @@ static int ad7291_write_event_value(struct iio_dev *indio_dev,
int val)
{
struct ad7291_chip_info *chip = iio_priv(indio_dev);
- u8 reg;
- s16 signval;
switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) {
case IIO_VOLTAGE:
if (val > AD7291_VALUE_MASK || val < 0)
return -EINVAL;
- reg = ad7291_limit_regs[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)]
- [!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING)];
- return ad7291_i2c_write(chip, reg, val);
+ break;
case IIO_TEMP:
if (val > 2047 || val < -2048)
return -EINVAL;
- reg = ad7291_limit_regs[8]
- [!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
- IIO_EV_DIR_RISING)];
- signval = val;
- return ad7291_i2c_write(chip, reg, *(u16 *)&signval);
+ break;
default:
return -EINVAL;
- };
+ }
+
+ return ad7291_i2c_write(chip, ad7291_threshold_reg(event_code), val);
}
static int ad7291_read_event_config(struct iio_dev *indio_dev,
@@ -456,9 +395,7 @@ static int ad7291_read_raw(struct iio_dev *indio_dev,
{
int ret;
struct ad7291_chip_info *chip = iio_priv(indio_dev);
- unsigned int scale_uv;
u16 regval;
- s16 signval;
switch (mask) {
case IIO_CHAN_INFO_RAW:
@@ -479,44 +416,47 @@ static int ad7291_read_raw(struct iio_dev *indio_dev,
return ret;
}
/* Read voltage */
- ret = i2c_smbus_read_word_data(chip->client,
+ ret = i2c_smbus_read_word_swapped(chip->client,
AD7291_VOLTAGE);
if (ret < 0) {
mutex_unlock(&chip->state_lock);
return ret;
}
- *val = swab16((u16)ret) & AD7291_VALUE_MASK;
+ *val = ret & AD7291_VALUE_MASK;
mutex_unlock(&chip->state_lock);
return IIO_VAL_INT;
case IIO_TEMP:
/* Assumes tsense bit of command register always set */
- ret = i2c_smbus_read_word_data(chip->client,
+ ret = i2c_smbus_read_word_swapped(chip->client,
AD7291_T_SENSE);
if (ret < 0)
return ret;
- signval = (s16)((swab16((u16)ret) &
- AD7291_VALUE_MASK) << 4) >> 4;
- *val = signval;
+ *val = sign_extend32(ret, 11);
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_AVERAGE_RAW:
- ret = i2c_smbus_read_word_data(chip->client,
+ ret = i2c_smbus_read_word_swapped(chip->client,
AD7291_T_AVERAGE);
if (ret < 0)
return ret;
- signval = (s16)((swab16((u16)ret) &
- AD7291_VALUE_MASK) << 4) >> 4;
- *val = signval;
+ *val = sign_extend32(ret, 11);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_VOLTAGE:
- scale_uv = (chip->int_vref_mv * 1000) >> AD7291_BITS;
- *val = scale_uv / 1000;
- *val2 = (scale_uv % 1000) * 1000;
- return IIO_VAL_INT_PLUS_MICRO;
+ if (chip->reg) {
+ int vref;
+ vref = regulator_get_voltage(chip->reg);
+ if (vref < 0)
+ return vref;
+ *val = vref / 1000;
+ } else {
+ *val = 2500;
+ }
+ *val2 = AD7291_BITS;
+ return IIO_VAL_FRACTIONAL_LOG2;
case IIO_TEMP:
/*
* One LSB of the ADC corresponds to 0.25 deg C.
@@ -571,7 +511,6 @@ static struct attribute_group ad7291_event_attribute_group = {
};
static const struct iio_info ad7291_info = {
- .attrs = &ad7291_attribute_group,
.read_raw = &ad7291_read_raw,
.read_event_config = &ad7291_read_event_config,
.write_event_config = &ad7291_write_event_config,
@@ -583,9 +522,10 @@ static const struct iio_info ad7291_info = {
static int ad7291_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ struct ad7291_platform_data *pdata = client->dev.platform_data;
struct ad7291_chip_info *chip;
struct iio_dev *indio_dev;
- int ret = 0, voltage_uv = 0;
+ int ret = 0;
indio_dev = iio_device_alloc(sizeof(*chip));
if (indio_dev == NULL) {
@@ -594,12 +534,14 @@ static int ad7291_probe(struct i2c_client *client,
}
chip = iio_priv(indio_dev);
- chip->reg = regulator_get(&client->dev, "vcc");
- if (!IS_ERR(chip->reg)) {
+ if (pdata && pdata->use_external_ref) {
+ chip->reg = regulator_get(&client->dev, "vref");
+ if (IS_ERR(chip->reg))
+ goto error_free;
+
ret = regulator_enable(chip->reg);
if (ret)
goto error_put_reg;
- voltage_uv = regulator_get_voltage(chip->reg);
}
mutex_init(&chip->state_lock);
@@ -612,12 +554,8 @@ static int ad7291_probe(struct i2c_client *client,
AD7291_T_SENSE_MASK | /* Tsense always enabled */
AD7291_ALERT_POLARITY; /* set irq polarity low level */
- if (voltage_uv) {
- chip->int_vref_mv = voltage_uv / 1000;
+ if (pdata && pdata->use_external_ref)
chip->command |= AD7291_EXT_REF;
- } else {
- chip->int_vref_mv = 2500; /* Build-in ref */
- }
indio_dev->name = id->name;
indio_dev->channels = ad7291_channels;
@@ -654,21 +592,18 @@ static int ad7291_probe(struct i2c_client *client,
if (ret)
goto error_unreg_irq;
- dev_info(&client->dev, "%s ADC registered.\n",
- id->name);
-
return 0;
error_unreg_irq:
if (client->irq)
free_irq(client->irq, indio_dev);
error_disable_reg:
- if (!IS_ERR(chip->reg))
+ if (chip->reg)
regulator_disable(chip->reg);
error_put_reg:
- if (!IS_ERR(chip->reg))
+ if (chip->reg)
regulator_put(chip->reg);
-
+error_free:
iio_device_free(indio_dev);
error_ret:
return ret;
@@ -684,7 +619,7 @@ static int ad7291_remove(struct i2c_client *client)
if (client->irq)
free_irq(client->irq, indio_dev);
- if (!IS_ERR(chip->reg)) {
+ if (chip->reg) {
regulator_disable(chip->reg);
regulator_put(chip->reg);
}
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