mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-20 09:31:09 +00:00
Code Issues Releases Wiki Activity

Input: nspire-keypad - enable interrupts only when opened

Browse source 
[ Upstream commit 69d5ff3e9e ]

The driver registers an interrupt handler in _probe, but didn't configure
them until later when the _open function is called. In between, the keypad
can fire an IRQ due to touchpad activity, which the handler ignores. This
causes the kernel to disable the interrupt, blocking the keypad from
working.

Fix this by disabling interrupts before registering the handler.
Additionally, disable them in _close, so that they're only enabled while
open.

Fixes: fc4f314618 ("Input: add TI-Nspire keypad support")
Signed-off-by: Fabian Vogt <fabian@ritter-vogt.de>
Link: https://lore.kernel.org/r/3383725.iizBOSrK1V@linux-e202.suse.de
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Fabian Vogt 2021-03-23 10:45:55 -07:00 committed by Greg Kroah-Hartman
parent b80ea54e1e
commit dfed481e62
1 changed files with 31 additions and 25 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

56
drivers/input/keyboard/nspire-keypad.c
View file

@ -93,9 +93,15 @@ static irqreturn_t nspire_keypad_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
static int nspire_keypad_chip_init(struct nspire_keypad *keypad)
static int nspire_keypad_open(struct input_dev *input)
{
struct nspire_keypad *keypad = input_get_drvdata(input);
unsigned long val = 0, cycles_per_us, delay_cycles, row_delay_cycles;
int error;
error = clk_prepare_enable(keypad->clk);
if (error)
return error;
cycles_per_us = (clk_get_rate(keypad->clk) / 1000000);
if (cycles_per_us == 0)
@ -121,30 +127,6 @@ static int nspire_keypad_chip_init(struct nspire_keypad *keypad)
keypad->int_mask = 1 << 1;
writel(keypad->int_mask, keypad->reg_base + KEYPAD_INTMSK);
/* Disable GPIO interrupts to prevent hanging on touchpad */
/* Possibly used to detect touchpad events */
writel(0, keypad->reg_base + KEYPAD_UNKNOWN_INT);
/* Acknowledge existing interrupts */
writel(~0, keypad->reg_base + KEYPAD_UNKNOWN_INT_STS);
return 0;
}
static int nspire_keypad_open(struct input_dev *input)
{
struct nspire_keypad *keypad = input_get_drvdata(input);
int error;
error = clk_prepare_enable(keypad->clk);
if (error)
return error;
error = nspire_keypad_chip_init(keypad);
if (error) {
clk_disable_unprepare(keypad->clk);
return error;
}
return 0;
}
@ -152,6 +134,11 @@ static void nspire_keypad_close(struct input_dev *input)
{
struct nspire_keypad *keypad = input_get_drvdata(input);
/* Disable interrupts */
writel(0, keypad->reg_base + KEYPAD_INTMSK);
/* Acknowledge existing interrupts */
writel(~0, keypad->reg_base + KEYPAD_INT);
clk_disable_unprepare(keypad->clk);
}
@ -210,6 +197,25 @@ static int nspire_keypad_probe(struct platform_device *pdev)
return -ENOMEM;
}
error = clk_prepare_enable(keypad->clk);
if (error) {
dev_err(&pdev->dev, "failed to enable clock\n");
return error;
}
/* Disable interrupts */
writel(0, keypad->reg_base + KEYPAD_INTMSK);
/* Acknowledge existing interrupts */
writel(~0, keypad->reg_base + KEYPAD_INT);
/* Disable GPIO interrupts to prevent hanging on touchpad */
/* Possibly used to detect touchpad events */
writel(0, keypad->reg_base + KEYPAD_UNKNOWN_INT);
/* Acknowledge existing GPIO interrupts */
writel(~0, keypad->reg_base + KEYPAD_UNKNOWN_INT_STS);
clk_disable_unprepare(keypad->clk);
input_set_drvdata(input, keypad);
input->id.bustype = BUS_HOST;