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Date: Fri, 1 Apr 2016 10:34:30 +0200 (CEST)
From: Peter Meerwald-Stadler <pmeerw@...erw.net>
To: Crestez Dan Leonard <leonard.crestez@...el.com>
cc: Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Daniel Baluta <daniel.baluta@...el.com>,
Thierry Reding <thierry.reding@...onic-design.de>
Subject: Re: [PATCH 2/2] ti-adc081c: Initial triggered buffer support
> Using this requires software triggers like CONFIG_IIO_HRTIMER_TRIGGER.
>
> The device can be configured to do internal periodic sampling but does
> not appear to offer some sort of interrupt on data ready. It only offers
> interrupts on values out of a specific range.
>
> Signed-off-by: Crestez Dan Leonard <leonard.crestez@...el.com>
> ---
> drivers/iio/adc/ti-adc081c.c | 99 +++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 83 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/iio/adc/ti-adc081c.c b/drivers/iio/adc/ti-adc081c.c
> index 9b2f26f..040e2aa 100644
> --- a/drivers/iio/adc/ti-adc081c.c
> +++ b/drivers/iio/adc/ti-adc081c.c
> @@ -24,6 +24,9 @@
> #include <linux/of.h>
>
> #include <linux/iio/iio.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
> #include <linux/regulator/consumer.h>
>
> struct adc081c {
> @@ -69,27 +72,83 @@ static int adc081c_read_raw(struct iio_dev *iio,
> return -EINVAL;
> }
>
> -static const struct iio_chan_spec adc081c_channel = {
> - .type = IIO_VOLTAGE,
> - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> -};
the patch would look cleaner/shorter if adc081c_channel won't get moved
around
> +static irqreturn_t adc081c_trigger_handler(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *indio_dev = pf->indio_dev;
> + struct adc081c *data = iio_priv(indio_dev);
> + s64 ts;
> + u16 buf[8];
comment: 2 bytes data + 6 bytes padding + 8 bytes timestamp
> + int ret;
> +
> + /* Otherwise iio_push_to_buffers will corrupt the stack. */
> + if (indio_dev->scan_bytes > sizeof(buf)) {
> + dev_crit_once(&indio_dev->dev, "Bad iio_scan_bytes=%d > %d\n",
> + indio_dev->scan_bytes, (int)sizeof(buf));
rather than casting sizeof(buf), use the correct printf length modifier,
i.e. %z
not sure if this check is needed
> + goto out;
> + }
> +
> + ret = i2c_smbus_read_word_swapped(data->i2c, REG_CONV_RES);
REG_CONV_RES should be called ADC081C_REG_CONV_RES, but that's a separate
issue
> + ts = iio_get_time_ns();
why is the timestamp taken here?, seems strange
often this is done together with iio_push_to_buffers_with_timestamp()
> + if (ret < 0)
> + goto out;
> + buf[0] = ret;
> + iio_push_to_buffers_with_timestamp(indio_dev, buf, ts);
> +out:
> + iio_trigger_notify_done(indio_dev->trig);
> + return IRQ_HANDLED;
> +}
>
> static const struct iio_info adc081c_info = {
> .read_raw = adc081c_read_raw,
> .driver_module = THIS_MODULE,
> };
>
> +struct adcxx1c_model {
> + int bits;
> + const struct iio_chan_spec* channels;
> +};
> +
> +#define ADCxx1C_CHAN(_bits) { \
> + .type = IIO_VOLTAGE, \
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .scan_type = { \
> + .sign = 'u', \
> + .realbits = (_bits), \
> + .storagebits = 16, \
> + .shift = 12 - (_bits), \
> + .endianness = IIO_CPU, \
> + }, \
> +}
> +
> +#define DEFINE_ADCxx1C_MODEL(_name, _bits) \
> + static const struct iio_chan_spec _name ## _channels[] = { \
> + ADCxx1C_CHAN((_bits)), \
> + IIO_CHAN_SOFT_TIMESTAMP(1), \
> + }; \
> + static const struct adcxx1c_model _name ## _model = { \
> + .bits = (_bits), \
> + .channels = _name ## _channels, \
> + }
> +
> +DEFINE_ADCxx1C_MODEL(adc081c, 8);
> +DEFINE_ADCxx1C_MODEL(adc101c, 10);
> +DEFINE_ADCxx1C_MODEL(adc121c, 12);
> +
> +struct adcxx1c_info {
> + int bits;
> + const struct adc081c_channels* channels;
> +};
> +
> static int adc081c_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> struct iio_dev *iio;
> struct adc081c *adc;
> + struct adcxx1c_model *model = (struct adcxx1c_model*)id->driver_data;
> int err;
>
> - if (id->driver_data != 8 && id->driver_data != 10 && id->driver_data != 12)
> - return -EINVAL;
> -
> if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
> return -EOPNOTSUPP;
>
> @@ -99,7 +158,7 @@ static int adc081c_probe(struct i2c_client *client,
>
> adc = iio_priv(iio);
> adc->i2c = client;
> - adc->bits = id->driver_data;
> + adc->bits = model->bits;
>
> adc->ref = devm_regulator_get(&client->dev, "vref");
> if (IS_ERR(adc->ref))
> @@ -114,18 +173,26 @@ static int adc081c_probe(struct i2c_client *client,
> iio->modes = INDIO_DIRECT_MODE;
> iio->info = &adc081c_info;
>
> - iio->channels = &adc081c_channel;
> - iio->num_channels = 1;
> + iio->channels = model->channels;
> + iio->num_channels = 2;
the number of channels could go into the adcxx1c_info struct
> +
> + err = iio_triggered_buffer_setup(iio, NULL, adc081c_trigger_handler, NULL);
> + if (err < 0) {
> + dev_err(&client->dev, "iio triggered buffer setup failed\n");
> + goto err_regulator_disable;
> + }
>
> err = iio_device_register(iio);
> if (err < 0)
> - goto regulator_disable;
> + goto err_buffer_cleanup;
>
> i2c_set_clientdata(client, iio);
>
> return 0;
>
> -regulator_disable:
> +err_buffer_cleanup:
> + iio_triggered_buffer_cleanup(iio);
> +err_regulator_disable:
> regulator_disable(adc->ref);
>
> return err;
> @@ -143,9 +210,9 @@ static int adc081c_remove(struct i2c_client *client)
> }
iio_triggered_buffer_cleanup() in _remove()?
> static const struct i2c_device_id adc081c_id[] = {
> - { "adc081c", 8 },
> - { "adc101c", 10 },
> - { "adc121c", 12 },
> + { "adc081c", (long)&adc081c_model },
often an enum is used instead of a pointer
> + { "adc101c", (long)&adc101c_model },
> + { "adc121c", (long)&adc121c_model },
> { }
> };
> MODULE_DEVICE_TABLE(i2c, adc081c_id);
>
--
Peter Meerwald-Stadler
+43-664-2444418 (mobile)
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