#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
-#include "dac.h"
#include "max517.h"
* bit 1: channel 2
* (this way, it's possible to set both channels at once)
*/
-static ssize_t max517_set_value(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count, int channel)
+static int max517_set_value(struct iio_dev *indio_dev,
+ long val, int channel)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct max517_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
- u8 outbuf[4]; /* 1x or 2x command + value */
- int outbuf_size = 0;
+ u8 outbuf[2];
int res;
- long val;
-
- res = strict_strtol(buf, 10, &val);
-
- if (res)
- return res;
if (val < 0 || val > 255)
return -EINVAL;
- if (channel & 1) {
- outbuf[outbuf_size++] = COMMAND_CHANNEL0;
- outbuf[outbuf_size++] = val;
- }
- if (channel & 2) {
- outbuf[outbuf_size++] = COMMAND_CHANNEL1;
- outbuf[outbuf_size++] = val;
- }
+ outbuf[0] = channel;
+ outbuf[1] = val;
- /*
- * At this point, there are always 1 or 2 two-byte commands in
- * outbuf. With 2 commands, the device can set two outputs
- * simultaneously, latching the values upon the end of the I2C
- * transfer.
- */
-
- res = i2c_master_send(client, outbuf, outbuf_size);
+ res = i2c_master_send(client, outbuf, 2);
if (res < 0)
return res;
-
- return count;
-}
-
-static ssize_t max517_set_value_1(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- return max517_set_value(dev, attr, buf, count, 1);
-}
-static IIO_DEV_ATTR_OUT_RAW(1, max517_set_value_1, 0);
-
-static ssize_t max517_set_value_2(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- return max517_set_value(dev, attr, buf, count, 2);
-}
-static IIO_DEV_ATTR_OUT_RAW(2, max517_set_value_2, 1);
-
-static ssize_t max517_set_value_both(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- return max517_set_value(dev, attr, buf, count, 3);
+ else if (res != 2)
+ return -EIO;
+ else
+ return 0;
}
-static IIO_DEVICE_ATTR_NAMED(out_voltage1and2_raw,
- out_voltage1&2_raw, S_IWUSR, NULL,
- max517_set_value_both, -1);
-static ssize_t max517_show_scale(struct device *dev,
- struct device_attribute *attr,
- char *buf, int channel)
+static int max517_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct max517_data *data = iio_priv(indio_dev);
- /* Corresponds to Vref / 2^(bits) */
- unsigned int scale_uv = (data->vref_mv[channel - 1] * 1000) >> 8;
-
- return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
+ unsigned int scale_uv;
+
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ /* Corresponds to Vref / 2^(bits) */
+ scale_uv = (data->vref_mv[chan->channel] * 1000) >> 8;
+ *val = scale_uv / 1000000;
+ *val2 = scale_uv % 1000000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ break;
+ }
+ return -EINVAL;
}
-static ssize_t max517_show_scale1(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+static int max517_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val, int val2, long mask)
{
- return max517_show_scale(dev, attr, buf, 1);
-}
-static IIO_DEVICE_ATTR(out_voltage1_scale, S_IRUGO,
- max517_show_scale1, NULL, 0);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = max517_set_value(indio_dev, val, chan->channel);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
-static ssize_t max517_show_scale2(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return max517_show_scale(dev, attr, buf, 2);
+ return ret;
}
-static IIO_DEVICE_ATTR(out_voltage2_scale, S_IRUGO,
- max517_show_scale2, NULL, 0);
-
-/* On MAX517 variant, we have one output */
-static struct attribute *max517_attributes[] = {
- &iio_dev_attr_out_voltage1_raw.dev_attr.attr,
- &iio_dev_attr_out_voltage1_scale.dev_attr.attr,
- NULL
-};
-
-static struct attribute_group max517_attribute_group = {
- .attrs = max517_attributes,
-};
-
-/* On MAX518 and MAX519 variant, we have two outputs */
-static struct attribute *max518_attributes[] = {
- &iio_dev_attr_out_voltage1_raw.dev_attr.attr,
- &iio_dev_attr_out_voltage1_scale.dev_attr.attr,
- &iio_dev_attr_out_voltage2_raw.dev_attr.attr,
- &iio_dev_attr_out_voltage2_scale.dev_attr.attr,
- &iio_dev_attr_out_voltage1and2_raw.dev_attr.attr,
- NULL
-};
-
-static struct attribute_group max518_attribute_group = {
- .attrs = max518_attributes,
-};
#ifdef CONFIG_PM_SLEEP
static int max517_suspend(struct device *dev)
#endif
static const struct iio_info max517_info = {
- .attrs = &max517_attribute_group,
+ .read_raw = max517_read_raw,
+ .write_raw = max517_write_raw,
.driver_module = THIS_MODULE,
};
-static const struct iio_info max518_info = {
- .attrs = &max518_attribute_group,
- .driver_module = THIS_MODULE,
+#define MAX517_CHANNEL(chan) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .output = 1, \
+ .channel = (chan), \
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
+ IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
+ .scan_type = IIO_ST('u', 8, 8, 0), \
+}
+
+static const struct iio_chan_spec max517_channels[] = {
+ MAX517_CHANNEL(0),
+ MAX517_CHANNEL(1)
};
static int max517_probe(struct i2c_client *client,
/* establish that the iio_dev is a child of the i2c device */
indio_dev->dev.parent = &client->dev;
- /* reduced attribute set for MAX517 */
+ /* reduced channel set for MAX517 */
if (id->driver_data == ID_MAX517)
- indio_dev->info = &max517_info;
+ indio_dev->num_channels = 1;
else
- indio_dev->info = &max518_info;
+ indio_dev->num_channels = 2;
+ indio_dev->channels = max517_channels;
indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &max517_info;
/*
* Reference voltage on MAX518 and default is 5V, else take vref_mv
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff