linux-kernel - Re: [PATCH v2 3/7] Input: synaptics-rmi4

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Date:   Sat, 3 Dec 2016 10:29:27 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Andrew Duggan <aduggan@...aptics.com>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Lyude Paul <thatslyude@...il.com>,
        Nick Dyer <nick@...anahar.org>,
        Dennis Wassenberg <dennis.wassenberg@...unet.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] Input: synaptics-rmi4 - allow to add attention
 data

On Fri, Dec 02, 2016 at 04:33:56PM -0800, Andrew Duggan wrote:
> On 12/02/2016 03:41 AM, Benjamin Tissoires wrote:
> >The HID implementation of RMI4 provides the data during
> >the interrupt (in the input report). We need to provide
> >a way for this transport driver to provide the attention
> >data while calling an IRQ.
> >
> >We use a fifo in rmi_core to not lose any incoming event.
> >
> >Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> 
> Reviewed-by: Andrew Duggan <aduggan@...aptics.com>

Applied, thank you.

> 
> >---
> >
> >no changes in v2
> >---
> >  drivers/input/rmi4/rmi_driver.c | 49 +++++++++++++++++++++++++++++++++++++++--
> >  include/linux/rmi.h             | 11 +++++++++
> >  2 files changed, 58 insertions(+), 2 deletions(-)
> >
> >diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
> >index a718e51..85062e4 100644
> >--- a/drivers/input/rmi4/rmi_driver.c
> >+++ b/drivers/input/rmi4/rmi_driver.c
> >@@ -191,16 +191,53 @@ static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
> >  	return 0;
> >  }
> >+void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status,
> >+		       void *data, size_t size)
> >+{
> >+	struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
> >+	struct rmi4_attn_data attn_data;
> >+	void *fifo_data;
> >+
> >+	if (!drvdata->enabled)
> >+		return;
> >+
> >+	fifo_data = kmemdup(data, size, GFP_ATOMIC);
> >+	if (!fifo_data)
> >+		return;
> >+
> >+	attn_data.irq_status = irq_status;
> >+	attn_data.size = size;
> >+	attn_data.data = fifo_data;
> >+
> >+	kfifo_put(&drvdata->attn_fifo, attn_data);
> >+}
> >+EXPORT_SYMBOL_GPL(rmi_set_attn_data);
> >+
> >  static irqreturn_t rmi_irq_fn(int irq, void *dev_id)
> >  {
> >  	struct rmi_device *rmi_dev = dev_id;
> >-	int ret;
> >+	struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
> >+	struct rmi4_attn_data attn_data = {0};
> >+	int ret, count;
> >+
> >+	count = kfifo_get(&drvdata->attn_fifo, &attn_data);
> >+	if (count) {
> >+		*(drvdata->irq_status) = attn_data.irq_status;
> >+		rmi_dev->xport->attn_data = attn_data.data;
> >+		rmi_dev->xport->attn_size = attn_data.size;
> >+	}
> >  	ret = rmi_process_interrupt_requests(rmi_dev);
> >  	if (ret)
> >  		rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev,
> >  			"Failed to process interrupt request: %d\n", ret);
> >+	if (count)
> >+		kfree(attn_data.data);
> >+
> >+	if (!kfifo_is_empty(&drvdata->attn_fifo))
> >+		return rmi_irq_fn(irq, dev_id);
> >+
> >  	return IRQ_HANDLED;
> >  }
> >@@ -880,8 +917,9 @@ void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake)
> >  {
> >  	struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
> >  	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
> >+	struct rmi4_attn_data attn_data = {0};
> >  	int irq = pdata->irq;
> >-	int retval;
> >+	int retval, count;
> >  	mutex_lock(&data->enabled_mutex);
> >@@ -898,6 +936,13 @@ void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake)
> >  				 retval);
> >  	}
> >+	/* make sure the fifo is clean */
> >+	while (!kfifo_is_empty(&data->attn_fifo)) {
> >+		count = kfifo_get(&data->attn_fifo, &attn_data);
> >+		if (count)
> >+			kfree(attn_data.data);
> >+	}
> >+
> >  out:
> >  	mutex_unlock(&data->enabled_mutex);
> >  }
> >diff --git a/include/linux/rmi.h b/include/linux/rmi.h
> >index 7780e40..1d48656 100644
> >--- a/include/linux/rmi.h
> >+++ b/include/linux/rmi.h
> >@@ -13,6 +13,7 @@
> >  #include <linux/device.h>
> >  #include <linux/interrupt.h>
> >  #include <linux/input.h>
> >+#include <linux/kfifo.h>
> >  #include <linux/list.h>
> >  #include <linux/module.h>
> >  #include <linux/types.h>
> >@@ -331,6 +332,12 @@ struct rmi_device {
> >  };
> >+struct rmi4_attn_data {
> >+	unsigned long irq_status;
> >+	size_t size;
> >+	void *data;
> >+};
> >+
> >  struct rmi_driver_data {
> >  	struct list_head function_list;
> >@@ -357,11 +364,15 @@ struct rmi_driver_data {
> >  	bool enabled;
> >  	struct mutex enabled_mutex;
> >+	DECLARE_KFIFO(attn_fifo, struct rmi4_attn_data, 16);
> >  };
> >  int rmi_register_transport_device(struct rmi_transport_dev *xport);
> >  void rmi_unregister_transport_device(struct rmi_transport_dev *xport);
> >+void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status,
> >+		       void *data, size_t size);
> >+
> >  int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake);
> >  int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake);
> >  #endif
> 
> 

-- 
Dmitry