[PATCH 03/26] Input: synaptics-rmi4 - explicitly request polling when needed

Andrew Duggan
2015-11-05T23:35:15Z

Host Notify does not work with neither IRQ nor polling. Allow a RMI4 driver
to request or not polling depending on the attn_gpio.

When neither the internal IRQ or polling systems are used, the
transport driver can call rmi_process_interrupt_requests() to
trigger a process of the alert.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Andrew Duggan <aduggan@synaptics.com>
---
drivers/input/rmi4/rmi_driver.c | 18 +++++++++---------
drivers/input/rmi4/rmi_driver.h | 3 +++
include/linux/rmi.h | 3 +++
3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index 95f9386..2fdc7e8 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -67,15 +67,13 @@ static irqreturn_t rmi_irq_thread(int irq, void *p)
return IRQ_HANDLED;
}

-static int process_interrupt_requests(struct rmi_device *rmi_dev);
-
static void rmi_poll_work(struct work_struct *work)
{
struct rmi_driver_data *data =
container_of(work, struct rmi_driver_data, poll_work);
struct rmi_device *rmi_dev = data->rmi_dev;

- process_interrupt_requests(rmi_dev);
+ rmi_process_interrupt_requests(rmi_dev);
}

/*
@@ -124,7 +122,7 @@ static void disable_sensor(struct rmi_device *rmi_dev)
if (!data->enabled)
return;

- if (!data->irq)
+ if (data->polling)
disable_polling(rmi_dev);

if (rmi_dev->xport->ops->disable_device)
@@ -163,7 +161,7 @@ static int enable_sensor(struct rmi_device *rmi_dev)
dev_name(&rmi_dev->dev), xport);
if (retval)
return retval;
- } else {
+ } else if (data->polling) {
retval = enable_polling(rmi_dev);
if (retval < 0)
return retval;
@@ -171,7 +169,7 @@ static int enable_sensor(struct rmi_device *rmi_dev)

data->enabled = true;

- return process_interrupt_requests(rmi_dev);
+ return rmi_process_interrupt_requests(rmi_dev);
}

static void rmi_free_function_list(struct rmi_device *rmi_dev)
@@ -274,7 +272,7 @@ static void process_one_interrupt(struct rmi_driver_data *data,
}
}

-static int process_interrupt_requests(struct rmi_device *rmi_dev)
+int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
{
struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
struct device *dev = &rmi_dev->dev;
@@ -315,6 +313,7 @@ static int process_interrupt_requests(struct rmi_device *rmi_dev)

return 0;
}
+EXPORT_SYMBOL_GPL(rmi_process_interrupt_requests);

/**
* rmi_driver_set_input_params - set input device id and other data.
@@ -421,7 +420,7 @@ static int rmi_driver_irq_handler(struct rmi_device *rmi_dev, int irq)
return 0;
}

- return process_interrupt_requests(rmi_dev);
+ return rmi_process_interrupt_requests(rmi_dev);
}

static int rmi_driver_reset_handler(struct rmi_device *rmi_dev)
@@ -949,10 +948,11 @@ static int rmi_driver_probe(struct device *dev)
}
}
}
- } else {
+ } else if (pdata->attn_gpio == RMI_POLLING) {
data->poll_interval = ktime_set(0,
(pdata->poll_interval_ms ? pdata->poll_interval_ms :
DEFAULT_POLL_INTERVAL_MS) * 1000 * 1000);
+ data->polling = true;
}

if (data->f01_container->dev.driver) {
diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
index 36ca34b..8a2d91a 100644
--- a/drivers/input/rmi4/rmi_driver.h
+++ b/drivers/input/rmi4/rmi_driver.h
@@ -43,6 +43,7 @@ struct rmi_driver_data {
u32 attn_count;
u32 irq_debug; /* Should be bool, but debugfs wants u32 */
bool gpio_held;
+ bool polling;
int irq;
int irq_flags;
int num_of_irq_regs;
@@ -115,6 +116,8 @@ bool rmi_is_physical_driver(struct device_driver *);
int rmi_register_physical_driver(void);
void rmi_unregister_physical_driver(void);

+int rmi_process_interrupt_requests(struct rmi_device *rmi_dev);
+
int rmi_register_f01_handler(void);
void rmi_unregister_f01_handler(void);
char *rmi_f01_get_product_ID(struct rmi_function *fn);
diff --git a/include/linux/rmi.h b/include/linux/rmi.h
index 1d22985..b771f41 100644
--- a/include/linux/rmi.h
+++ b/include/linux/rmi.h
@@ -23,6 +23,9 @@
#include <linux/wait.h>
#include <linux/debugfs.h>

+#define RMI_POLLING -1
+#define RMI_CUSTOM_IRQ -2
+
enum rmi_attn_polarity {
RMI_ATTN_ACTIVE_LOW = 0,
RMI_ATTN_ACTIVE_HIGH = 1
--
2.1.4