linux-kernel - Re: [PATCH v5 3/7] Input: synaptics-rmi4 - add support for F34 device reflash

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Date:   Mon, 7 Nov 2016 17:47:13 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Nick Dyer <nick@...anahar.org>
Cc:     Andrew Duggan <aduggan@...aptics.com>,
        Chris Healy <cphealy@...il.com>,
        Henrik Rydberg <rydberg@...math.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/7] Input: synaptics-rmi4 - add support for F34
 device reflash

On Mon, Oct 24, 2016 at 10:51:53PM +0100, Nick Dyer wrote:
> Add support for updating firmware, triggered by a sysfs attribute.
> 
> This patch has been tested on Synaptics S7300.
> 
> Signed-off-by: Nick Dyer <nick@...anahar.org>
> Tested-by: Chris Healy <cphealy@...il.com>
> ---
>  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;

So you simply "lose" old irq_status memory and rely on devm clear it
later? If anything it requires a comment, but I would like we did not
leave stray memory.

Thanks.

-- 
Dmitry