Add support for updating firmware, triggered by a sysfs attribute.

This patch has been tested on Synaptics S7300.

Signed-off-by: Nick Dyer <nick@shmanahar.org>
Tested-by: Chris Healy <redacted>
---
 drivers/input/rmi4/Kconfig      |  11 +
 drivers/input/rmi4/Makefile     |   1 +
 drivers/input/rmi4/rmi_bus.c    |   3 +
 drivers/input/rmi4/rmi_driver.c |  89 ++++++--
 drivers/input/rmi4/rmi_driver.h |  24 ++
 drivers/input/rmi4/rmi_f01.c    |   6 +
 drivers/input/rmi4/rmi_f34.c    | 494 ++++++++++++++++++++++++++++++++++++++++
 drivers/input/rmi4/rmi_f34.h    |  68 ++++++
 include/linux/rmi.h             |   1 +
 9 files changed, 673 insertions(+), 24 deletions(-)
 create mode 100644 drivers/input/rmi4/rmi_f34.c
 create mode 100644 drivers/input/rmi4/rmi_f34.h

diff --git a/drivers/input/rmi4/Kconfig b/drivers/input/rmi4/Kconfig
index 4c8a558..9f10b1f 100644
--- a/drivers/input/rmi4/Kconfig
+++ b/drivers/input/rmi4/Kconfig

@@ -62,6 +62,17 @@ config RMI4_F30
 	  Function 30 provides GPIO and LED support for RMI4 devices. This
 	  includes support for buttons on TouchPads and ClickPads.
 
+config RMI4_F34
+	bool "RMI4 Function 34 (Device reflash)"
+	depends on RMI4_CORE
+	select FW_LOADER
+	help
+	  Say Y here if you want to add support for RMI4 function 34.
+
+	  Function 34 provides support for upgrading the firmware on the RMI4
+	  device via the firmware loader interface. This is triggered using a
+	  sysfs attribute.
+
 config RMI4_F54
 	bool "RMI4 Function 54 (Analog diagnostics)"
 	depends on RMI4_CORE

diff --git a/drivers/input/rmi4/Makefile b/drivers/input/rmi4/Makefile
index 0bafc85..5f165ad 100644
--- a/drivers/input/rmi4/Makefile
+++ b/drivers/input/rmi4/Makefile

@@ -7,6 +7,7 @@ rmi_core-$(CONFIG_RMI4_2D_SENSOR) += rmi_2d_sensor.o
 rmi_core-$(CONFIG_RMI4_F11) += rmi_f11.o
 rmi_core-$(CONFIG_RMI4_F12) += rmi_f12.o
 rmi_core-$(CONFIG_RMI4_F30) += rmi_f30.o
+rmi_core-$(CONFIG_RMI4_F34) += rmi_f34.o
 rmi_core-$(CONFIG_RMI4_F54) += rmi_f54.o
 
 # Transports

diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c
index 3c6a1b5..178d388 100644
--- a/drivers/input/rmi4/rmi_bus.c
+++ b/drivers/input/rmi4/rmi_bus.c

@@ -314,6 +314,9 @@ static struct rmi_function_handler *fn_handlers[] = {
 #ifdef CONFIG_RMI4_F30
 	&rmi_f30_handler,
 #endif
+#ifdef CONFIG_RMI4_F34
+	&rmi_f34_handler,
+#endif
 #ifdef CONFIG_RMI4_F54
 	&rmi_f54_handler,
 #endif

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index adb3ee8..545f7db 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c

@@ -33,14 +33,21 @@
 #define RMI_DEVICE_RESET_CMD	0x01
 #define DEFAULT_RESET_DELAY_MS	100
 
-static void rmi_free_function_list(struct rmi_device *rmi_dev)
+void rmi_free_function_list(struct rmi_device *rmi_dev)
 {
 	struct rmi_function *fn, *tmp;
 	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
 
 	rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Freeing function list\n");
 
+	mutex_lock(&data->irq_mutex);
+
 	data->f01_container = NULL;
+	data->f34_container = NULL;
+	data->irq_status = NULL;