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Message-ID: <CAGXu5j+yqsyNkbBc=T61MK1ARxHZNaG+=UgaKy1w9w8M_hR8BA@mail.gmail.com>
Date: Mon, 30 Oct 2017 15:14:54 -0700
From: Kees Cook <keescook@...omium.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Hans Verkuil <hans.verkuil@...co.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: av7110: switch to useing timer_setup()
On Tue, Oct 24, 2017 at 5:40 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly.
>
> Also stop poking into input core internals and override its autorepeat
> timer function. I am not sure why we have such convoluted autorepeat
> handling in this driver instead of letting input core handle autorepeat,
> but this preserves current behavior of allowing controlling autorepeat
> delay and forcing autorepeat period to be whatever the hardware has.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
(with the Subject typo fixed)
Hans, since this depends on the input side not changing first, I think
it makes sense for Dmitry to carry this in the Input tree before the
Input timer updates. Would that be okay?
Thanks!
-Kees
> ---
>
> Note that this has not been tested on the hardware. But it should
> compile, so I have that going for me.
>
> drivers/media/pci/ttpci/av7110.h | 4 ++--
> drivers/media/pci/ttpci/av7110_ir.c | 40 +++++++++++++++++--------------------
> 2 files changed, 20 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/media/pci/ttpci/av7110.h b/drivers/media/pci/ttpci/av7110.h
> index 347827925c14..0aa3c6f01853 100644
> --- a/drivers/media/pci/ttpci/av7110.h
> +++ b/drivers/media/pci/ttpci/av7110.h
> @@ -80,10 +80,11 @@ struct av7110;
>
> /* infrared remote control */
> struct infrared {
> - u16 key_map[256];
> + u16 key_map[256];
> struct input_dev *input_dev;
> char input_phys[32];
> struct timer_list keyup_timer;
> + unsigned long keydown_time;
> struct tasklet_struct ir_tasklet;
> void (*ir_handler)(struct av7110 *av7110, u32 ircom);
> u32 ir_command;
> @@ -93,7 +94,6 @@ struct infrared {
> u8 inversion;
> u16 last_key;
> u16 last_toggle;
> - u8 delay_timer_finished;
> };
>
>
> diff --git a/drivers/media/pci/ttpci/av7110_ir.c b/drivers/media/pci/ttpci/av7110_ir.c
> index ca05198de2c2..b602e64b3412 100644
> --- a/drivers/media/pci/ttpci/av7110_ir.c
> +++ b/drivers/media/pci/ttpci/av7110_ir.c
> @@ -84,9 +84,9 @@ static u16 default_key_map [256] = {
>
>
> /* key-up timer */
> -static void av7110_emit_keyup(unsigned long parm)
> +static void av7110_emit_keyup(struct timer_list *t)
> {
> - struct infrared *ir = (struct infrared *) parm;
> + struct infrared *ir = from_timer(ir, keyup_timer, t);
>
> if (!ir || !test_bit(ir->last_key, ir->input_dev->key))
> return;
> @@ -152,19 +152,20 @@ static void av7110_emit_key(unsigned long parm)
> return;
> }
>
> - if (timer_pending(&ir->keyup_timer)) {
> - del_timer(&ir->keyup_timer);
> + if (del_timer(&ir->keyup_timer)) {
> if (ir->last_key != keycode || toggle != ir->last_toggle) {
> - ir->delay_timer_finished = 0;
> + ir->keydown_time = jiffies;
> input_event(ir->input_dev, EV_KEY, ir->last_key, 0);
> input_event(ir->input_dev, EV_KEY, keycode, 1);
> input_sync(ir->input_dev);
> - } else if (ir->delay_timer_finished) {
> + } else if (time_after(jiffies, ir->keydown_time +
> + msecs_to_jiffies(
> + ir->input_dev->rep[REP_PERIOD]))) {
> input_event(ir->input_dev, EV_KEY, keycode, 2);
> input_sync(ir->input_dev);
> }
> } else {
> - ir->delay_timer_finished = 0;
> + ir->keydown_time = jiffies;
> input_event(ir->input_dev, EV_KEY, keycode, 1);
> input_sync(ir->input_dev);
> }
> @@ -172,9 +173,7 @@ static void av7110_emit_key(unsigned long parm)
> ir->last_key = keycode;
> ir->last_toggle = toggle;
>
> - ir->keyup_timer.expires = jiffies + UP_TIMEOUT;
> - add_timer(&ir->keyup_timer);
> -
> + mod_timer(&ir->keyup_timer, jiffies + UP_TIMEOUT);
> }
>
>
> @@ -184,12 +183,19 @@ static void input_register_keys(struct infrared *ir)
> int i;
>
> set_bit(EV_KEY, ir->input_dev->evbit);
> - set_bit(EV_REP, ir->input_dev->evbit);
> set_bit(EV_MSC, ir->input_dev->evbit);
>
> set_bit(MSC_RAW, ir->input_dev->mscbit);
> set_bit(MSC_SCAN, ir->input_dev->mscbit);
>
> + set_bit(EV_REP, ir->input_dev->evbit);
> + /*
> + * By setting the delay before registering input device we
> + * indicate that we will be implementing the autorepeat
> + * ourselves.
> + */
> + ir->input_dev->rep[REP_DELAY] = 250;
> +
> memset(ir->input_dev->keybit, 0, sizeof(ir->input_dev->keybit));
>
> for (i = 0; i < ARRAY_SIZE(ir->key_map); i++) {
> @@ -205,15 +211,6 @@ static void input_register_keys(struct infrared *ir)
> }
>
>
> -/* called by the input driver after rep[REP_DELAY] ms */
> -static void input_repeat_key(unsigned long parm)
> -{
> - struct infrared *ir = (struct infrared *) parm;
> -
> - ir->delay_timer_finished = 1;
> -}
> -
> -
> /* check for configuration changes */
> int av7110_check_ir_config(struct av7110 *av7110, int force)
> {
> @@ -333,8 +330,7 @@ int av7110_ir_init(struct av7110 *av7110)
> av_list[av_cnt++] = av7110;
> av7110_check_ir_config(av7110, true);
>
> - setup_timer(&av7110->ir.keyup_timer, av7110_emit_keyup,
> - (unsigned long)&av7110->ir);
> + timer_setup(&av7110->ir.keyup_timer, av7110_emit_keyup, 0);
>
> input_dev = input_allocate_device();
> if (!input_dev)
> --
> 2.15.0.rc0.271.g36b669edcc-goog
>
>
> --
> Dmitry
--
Kees Cook
Pixel Security
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