Peter Meerwald <pmeerw@xxxxxxxxxx> wrote:
>Signed-off-by: Peter Meerwald <pmeerw@xxxxxxxxxx>
Abi docs?
>---
>drivers/iio/dac/mcp4725.c | 64
>+++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 62 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/iio/dac/mcp4725.c b/drivers/iio/dac/mcp4725.c
>index a612ec7..cb9db90 100644
>--- a/drivers/iio/dac/mcp4725.c
>+++ b/drivers/iio/dac/mcp4725.c
>@@ -12,14 +12,13 @@
>* driver for the Microchip I2C 12-bit digital-to-analog converter (DAC)
> * (7-bit I2C slave address 0x60, the three LSBs can be configured in
> * hardware)
>- *
>- * writing the DAC value to EEPROM is not supported
> */
>
> #include <linux/module.h>
> #include <linux/init.h>
> #include <linux/i2c.h>
> #include <linux/err.h>
>+#include <linux/delay.h>
>
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
>@@ -64,6 +63,66 @@ static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops,
>mcp4725_suspend, mcp4725_resume);
> #define MCP4725_PM_OPS NULL
> #endif
>
>+static int mcp4725_store_eeprom(struct device *dev,
>+ struct device_attribute *attr, const char *buf, size_t len)
>+{
>+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>+ struct mcp4725_data *data = iio_priv(indio_dev);
>+ int tries = 20;
>+ u8 inoutbuf[3];
>+ bool state;
>+ int ret;
>+
>+ ret = strtobool(buf, &state);
>+ if (ret < 0)
>+ return ret;
>+
>+ if (!state)
>+ return 0;
>+
>+ inoutbuf[0] = 0x60; /* write EEPROM */
>+ inoutbuf[1] = data->dac_value >> 4;
>+ inoutbuf[2] = (data->dac_value & 0xf) << 4;
>+
>+ ret = i2c_master_send(data->client, inoutbuf, 3);
>+ if (ret < 0)
>+ return ret;
>+ else if (ret != 3)
>+ return -EIO;
>+
>+ /* wait for write complete, takes up to 50ms */
>+ while (tries--) {
>+ msleep(20);
>+ ret = i2c_master_recv(data->client, inoutbuf, 3);
>+ if (ret < 0)
>+ return ret;
>+ else if (ret != 3)
>+ return -EIO;
>+
>+ if (inoutbuf[0] & 0x80)
>+ break;
>+ }
>+
>+ if (tries < 0) {
>+ dev_err(&data->client->dev,
>+ "mcp4725_store_eeprom() failed, incomplete\n");
>+ return -EIO;
>+ }
>+
>+ return len;
>+}
>+
>+static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, NULL,
>mcp4725_store_eeprom, 0);
>+
>+static struct attribute *mcp4725_attributes[] = {
>+ &iio_dev_attr_store_eeprom.dev_attr.attr,
>+ NULL,
>+};
>+
>+static const struct attribute_group mcp4725_attribute_group = {
>+ .attrs = mcp4725_attributes,
>+};
>+
> static const struct iio_chan_spec mcp4725_channel = {
> .type = IIO_VOLTAGE,
> .indexed = 1,
>@@ -138,6 +197,7 @@ static int mcp4725_write_raw(struct iio_dev
>*indio_dev,
> static const struct iio_info mcp4725_info = {
> .read_raw = mcp4725_read_raw,
> .write_raw = mcp4725_write_raw,
>+ .attrs = &mcp4725_attribute_group,
> .driver_module = THIS_MODULE,
> };
>
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
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