> >Signed-off-by: Peter Meerwald <pmeerw@xxxxxxxxxx> > > Abi docs? see patch 4 of the series, http://thread.gmane.org/gmane.linux.kernel.iio/7834 the idea is to move store_eeprom from Documentation/ABI/testing/sysfs-bus-iio-frequency-ad9523 to Documentation/ABI/testing/sysfs-bus-iio i.e. reuse existing ABI p. > >--- > >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, > > }; > > > > -- Peter Meerwald +43-664-2444418 (mobile) -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
