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Date: Mon, 31 Aug 2015 17:41:22 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Teodora Baluta <teodora.baluta@...el.com>
Cc: knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
daniel.baluta@...el.com, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] iio: mxc4005: add data ready trigger for mxc4005
On 20/08/15 15:37, Teodora Baluta wrote:
> Add iio trigger for the data ready interrupt that signals new
> measurements for the X, Y and Z axes.
>
> Signed-off-by: Teodora Baluta <teodora.baluta@...el.com>
Or alternatively you lost a stray line into this patch from the
previous one (the pollfunc line!) Anyhow, all's well that ends
well!
Applied this one (with predictable fuzz) to the togreg branch of
iio.git - initially pushed out as testing for the autobuilders to
play with it.
Thanks,
Jonathan
> ---
> drivers/iio/accel/mxc4005.c | 144 +++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 142 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/accel/mxc4005.c b/drivers/iio/accel/mxc4005.c
> index 95b91b5..e72e218 100644
> --- a/drivers/iio/accel/mxc4005.c
> +++ b/drivers/iio/accel/mxc4005.c
> @@ -17,13 +17,16 @@
> #include <linux/i2c.h>
> #include <linux/iio/iio.h>
> #include <linux/acpi.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/regmap.h>
> #include <linux/iio/sysfs.h>
> +#include <linux/iio/trigger.h>
> #include <linux/iio/buffer.h>
> #include <linux/iio/triggered_buffer.h>
> #include <linux/iio/trigger_consumer.h>
>
> #define MXC4005_DRV_NAME "mxc4005"
> +#define MXC4005_IRQ_NAME "mxc4005_event"
> #define MXC4005_REGMAP_NAME "mxc4005_regmap"
>
> #define MXC4005_REG_XOUT_UPPER 0x03
> @@ -33,6 +36,12 @@
> #define MXC4005_REG_ZOUT_UPPER 0x07
> #define MXC4005_REG_ZOUT_LOWER 0x08
>
> +#define MXC4005_REG_INT_MASK1 0x0B
> +#define MXC4005_REG_INT_MASK1_BIT_DRDYE 0x01
> +
> +#define MXC4005_REG_INT_CLR1 0x01
> +#define MXC4005_REG_INT_CLR1_BIT_DRDYC 0x01
> +
> #define MXC4005_REG_CONTROL 0x0D
> #define MXC4005_REG_CONTROL_MASK_FSR GENMASK(6, 5)
> #define MXC4005_CONTROL_FSR_SHIFT 5
> @@ -55,7 +64,9 @@ struct mxc4005_data {
> struct device *dev;
> struct mutex mutex;
> struct regmap *regmap;
> + struct iio_trigger *dready_trig;
> __be16 buffer[8];
> + bool trigger_enabled;
> };
>
> /*
> @@ -107,6 +118,8 @@ static bool mxc4005_is_readable_reg(struct device *dev, unsigned int reg)
> static bool mxc4005_is_writeable_reg(struct device *dev, unsigned int reg)
> {
> switch (reg) {
> + case MXC4005_REG_INT_CLR1:
> + case MXC4005_REG_INT_MASK1:
> case MXC4005_REG_CONTROL:
> return true;
> default:
> @@ -299,7 +312,7 @@ static irqreturn_t mxc4005_trigger_handler(int irq, void *private)
> goto err;
>
> iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
> - iio_get_time_ns());
> + pf->timestamp);
>
> err:
> iio_trigger_notify_done(indio_dev->trig);
> @@ -307,6 +320,91 @@ err:
> return IRQ_HANDLED;
> }
>
> +static int mxc4005_clr_intr(struct mxc4005_data *data)
> +{
> + int ret;
> +
> + /* clear interrupt */
> + ret = regmap_write(data->regmap, MXC4005_REG_INT_CLR1,
> + MXC4005_REG_INT_CLR1_BIT_DRDYC);
> + if (ret < 0) {
> + dev_err(data->dev, "failed to write to reg_int_clr1\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int mxc4005_set_trigger_state(struct iio_trigger *trig,
> + bool state)
> +{
> + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
> + struct mxc4005_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + mutex_lock(&data->mutex);
> + if (state) {
> + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1,
> + MXC4005_REG_INT_MASK1_BIT_DRDYE);
> + } else {
> + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1,
> + ~MXC4005_REG_INT_MASK1_BIT_DRDYE);
> + }
> +
> + if (ret < 0) {
> + mutex_unlock(&data->mutex);
> + dev_err(data->dev, "failed to update reg_int_mask1");
> + return ret;
> + }
> +
> + data->trigger_enabled = state;
> + mutex_unlock(&data->mutex);
> +
> + return 0;
> +}
> +
> +static int mxc4005_trigger_try_reen(struct iio_trigger *trig)
> +{
> + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
> + struct mxc4005_data *data = iio_priv(indio_dev);
> +
> + if (!data->dready_trig)
> + return 0;
> +
> + return mxc4005_clr_intr(data);
> +}
> +
> +static const struct iio_trigger_ops mxc4005_trigger_ops = {
> + .set_trigger_state = mxc4005_set_trigger_state,
> + .try_reenable = mxc4005_trigger_try_reen,
> + .owner = THIS_MODULE,
> +};
> +
> +static int mxc4005_gpio_probe(struct i2c_client *client,
> + struct mxc4005_data *data)
> +{
> + struct device *dev;
> + struct gpio_desc *gpio;
> + int ret;
> +
> + if (!client)
> + return -EINVAL;
> +
> + dev = &client->dev;
> +
> + gpio = devm_gpiod_get_index(dev, "mxc4005_int", 0, GPIOD_IN);
> + if (IS_ERR(gpio)) {
> + dev_err(dev, "failed to get acpi gpio index\n");
> + return PTR_ERR(gpio);
> + }
> +
> + ret = gpiod_to_irq(gpio);
> +
> + dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
> +
> + return ret;
> +}
> +
> static int mxc4005_chip_init(struct mxc4005_data *data)
> {
> int ret;
> @@ -363,7 +461,7 @@ static int mxc4005_probe(struct i2c_client *client,
> indio_dev->info = &mxc4005_info;
>
> ret = iio_triggered_buffer_setup(indio_dev,
> - &iio_pollfunc_store_time,
> + iio_pollfunc_store_time,
> mxc4005_trigger_handler,
> NULL);
> if (ret < 0) {
> @@ -372,6 +470,43 @@ static int mxc4005_probe(struct i2c_client *client,
> return ret;
> }
>
> + if (client->irq < 0)
> + client->irq = mxc4005_gpio_probe(client, data);
> +
> + if (client->irq > 0) {
> + data->dready_trig = devm_iio_trigger_alloc(&client->dev,
> + "%s-dev%d",
> + indio_dev->name,
> + indio_dev->id);
> + if (!data->dready_trig)
> + return -ENOMEM;
> +
> + ret = devm_request_threaded_irq(&client->dev, client->irq,
> + iio_trigger_generic_data_rdy_poll,
> + NULL,
> + IRQF_TRIGGER_FALLING |
> + IRQF_ONESHOT,
> + MXC4005_IRQ_NAME,
> + data->dready_trig);
> + if (ret) {
> + dev_err(&client->dev,
> + "failed to init threaded irq\n");
> + goto err_buffer_cleanup;
> + }
> +
> + data->dready_trig->dev.parent = &client->dev;
> + data->dready_trig->ops = &mxc4005_trigger_ops;
> + iio_trigger_set_drvdata(data->dready_trig, indio_dev);
> + indio_dev->trig = data->dready_trig;
> + iio_trigger_get(indio_dev->trig);
> + ret = iio_trigger_register(data->dready_trig);
> + if (ret) {
> + dev_err(&client->dev,
> + "failed to register trigger\n");
> + goto err_trigger_unregister;
> + }
> + }
> +
> ret = iio_device_register(indio_dev);
> if (ret < 0) {
> dev_err(&client->dev,
> @@ -381,6 +516,8 @@ static int mxc4005_probe(struct i2c_client *client,
>
> return 0;
>
> +err_trigger_unregister:
> + iio_trigger_unregister(data->dready_trig);
> err_buffer_cleanup:
> iio_triggered_buffer_cleanup(indio_dev);
>
> @@ -390,10 +527,13 @@ err_buffer_cleanup:
> static int mxc4005_remove(struct i2c_client *client)
> {
> struct iio_dev *indio_dev = i2c_get_clientdata(client);
> + struct mxc4005_data *data = iio_priv(indio_dev);
>
> iio_device_unregister(indio_dev);
>
> iio_triggered_buffer_cleanup(indio_dev);
> + if (data->dready_trig)
> + iio_trigger_unregister(data->dready_trig);
>
> return 0;
> }
>
--
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