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@xxxxxxxxxx>
Reviewed-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx>
---
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
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