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Input: iqs7222 - fortify slider event reporting

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The release cycle of any key mapped to a slider gesture relies upon
trailing interrupts generated by other unmasked sources, the timing
and presence of which are inconsistent.

To solve this problem, explicitly report a release cycle to emulate
a full keystroke. Also, unmask touch interrupts if the slider press
event is defined; this ensures the device reports a final interrupt
with coordinate = 0xFFFF once the finger is lifted.

As a result of how the logic has been refactored, the press/release
event can now be mapped to a GPIO. This is more convenient than the
previous solution, which required each channel within the slider to
specify the same GPIO.

As part of this change, use the device's resolution rather than its
number of interrupt status registers to more safely determine if it
is capable of reporting gestures.

Last but not least, make the code a bit simpler by eliminating some
unnecessarily complex conditional statements and a macro that could
be derived using information that is already available.

Fixes: e505edaedc ("Input: add support for Azoteq IQS7222A/B/C")
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20220626072412.475211-3-jeff@labundy.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Jeff LaBundy 2022-06-27 15:14:04 -07:00 committed by Dmitry Torokhov
parent 56a0c54c4c
commit 95215d3d19
1 changed files with 58 additions and 38 deletions
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96
drivers/input/misc/iqs7222.c
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@ -40,7 +40,6 @@
#define IQS7222_SLDR_SETUP_2_RES_MASK GENMASK(15, 8)
#define IQS7222_SLDR_SETUP_2_RES_SHIFT 8
#define IQS7222_SLDR_SETUP_2_TOP_SPEED_MASK GENMASK(7, 0)
#define IQS7222_SLDR_SETUP_3_CHAN_SEL_MASK GENMASK(9, 0)
#define IQS7222_GPIO_SETUP_0_GPIO_EN BIT(0)
@ -54,6 +53,9 @@
#define IQS7222_SYS_SETUP_ACK_RESET BIT(0)
#define IQS7222_EVENT_MASK_ATI BIT(12)
#define IQS7222_EVENT_MASK_SLDR BIT(10)
#define IQS7222_EVENT_MASK_TOUCH BIT(1)
#define IQS7222_EVENT_MASK_PROX BIT(0)
#define IQS7222_COMMS_HOLD BIT(0)
#define IQS7222_COMMS_ERROR 0xEEEE
@ -135,12 +137,12 @@ struct iqs7222_event_desc {
static const struct iqs7222_event_desc iqs7222_kp_events[] = {
{
.name = "event-prox",
.enable = BIT(0),
.enable = IQS7222_EVENT_MASK_PROX,
.reg_key = IQS7222_REG_KEY_PROX,
},
{
.name = "event-touch",
.enable = BIT(1),
.enable = IQS7222_EVENT_MASK_TOUCH,
.reg_key = IQS7222_REG_KEY_TOUCH,
},
};
@ -1957,8 +1959,8 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222, int sldr_index)
int num_chan = dev_desc->reg_grps[IQS7222_REG_GRP_CHAN].num_row;
int ext_chan = rounddown(num_chan, 10);
int count, error, reg_offset, i;
u16 *event_mask = &iqs7222->sys_setup[dev_desc->event_offset];
u16 *sldr_setup = iqs7222->sldr_setup[sldr_index];
u16 *sys_setup = iqs7222->sys_setup;
unsigned int chan_sel[4], val;
error = iqs7222_parse_props(iqs7222, &sldr_node, sldr_index,
@ -2003,7 +2005,7 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222, int sldr_index)
reg_offset = dev_desc->sldr_res < U16_MAX ? 0 : 1;
sldr_setup[0] |= count;
sldr_setup[3 + reg_offset] &= ~IQS7222_SLDR_SETUP_3_CHAN_SEL_MASK;
sldr_setup[3 + reg_offset] &= ~GENMASK(ext_chan - 1, 0);
for (i = 0; i < ARRAY_SIZE(chan_sel); i++) {
sldr_setup[5 + reg_offset + i] = 0;
@ -2106,6 +2108,22 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222, int sldr_index)
if (error)
return error;
/*
* The press/release event does not expose a direct GPIO link,
* but one can be emulated by tying each of the participating
* channels to the same GPIO.
*/
error = iqs7222_gpio_select(iqs7222, event_node,
i ? iqs7222_sl_events[i].enable
: sldr_setup[3 + reg_offset],
i ? 1568 + sldr_index * 30
: sldr_setup[4 + reg_offset]);
if (error)
return error;
if (!reg_offset)
sldr_setup[9] |= iqs7222_sl_events[i].enable;
error = fwnode_property_read_u32(event_node, "linux,code",
&val);
if (error) {
@ -2117,26 +2135,20 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222, int sldr_index)
iqs7222->sl_code[sldr_index][i] = val;
input_set_capability(iqs7222->keypad, EV_KEY, val);
/*
* The press/release event is determined based on whether the
* coordinate field reports 0xFFFF and has no explicit enable
* control.
*/
if (!iqs7222_sl_events[i].enable || reg_offset)
continue;
sldr_setup[9] |= iqs7222_sl_events[i].enable;
error = iqs7222_gpio_select(iqs7222, event_node,
iqs7222_sl_events[i].enable,
1568 + sldr_index * 30);
if (error)
return error;
if (!dev_desc->event_offset)
continue;
sys_setup[dev_desc->event_offset] |= BIT(10 + sldr_index);
/*
* The press/release event is determined based on whether the
* coordinate field reports 0xFFFF and solely relies on touch
* or proximity interrupts to be unmasked.
*/
if (i && !reg_offset)
*event_mask |= (IQS7222_EVENT_MASK_SLDR << sldr_index);
else if (sldr_setup[4 + reg_offset] == dev_desc->touch_link)
*event_mask |= IQS7222_EVENT_MASK_TOUCH;
else
*event_mask |= IQS7222_EVENT_MASK_PROX;
}
/*
@ -2301,29 +2313,37 @@ static int iqs7222_report(struct iqs7222_private *iqs7222)
input_report_abs(iqs7222->keypad, iqs7222->sl_axis[i],
sldr_pos);
for (j = 0; j < ARRAY_SIZE(iqs7222_sl_events); j++) {
input_report_key(iqs7222->keypad, iqs7222->sl_code[i][0],
sldr_pos < dev_desc->sldr_res);
/*
* A maximum resolution indicates the device does not support
* gestures, in which case the remaining fields are ignored.
*/
if (dev_desc->sldr_res == U16_MAX)
continue;
if (!(le16_to_cpu(status[1]) & IQS7222_EVENT_MASK_SLDR << i))
continue;
/*
* Skip the press/release event, as it does not have separate
* status fields and is handled separately.
*/
for (j = 1; j < ARRAY_SIZE(iqs7222_sl_events); j++) {
u16 mask = iqs7222_sl_events[j].mask;
u16 val = iqs7222_sl_events[j].val;
if (!iqs7222_sl_events[j].enable) {
input_report_key(iqs7222->keypad,
iqs7222->sl_code[i][j],
sldr_pos < dev_desc->sldr_res);
continue;
}
/*
* The remaining offsets represent gesture state, and
* are discarded in the case of IQS7222C because only
* absolute position is reported.
*/
if (num_stat < IQS7222_MAX_COLS_STAT)
continue;
input_report_key(iqs7222->keypad,
iqs7222->sl_code[i][j],
(state & mask) == val);
}
input_sync(iqs7222->keypad);
for (j = 1; j < ARRAY_SIZE(iqs7222_sl_events); j++)
input_report_key(iqs7222->keypad,
iqs7222->sl_code[i][j], 0);
}
input_sync(iqs7222->keypad);