[PATCH v2 4/5] Input: mpr121 - handle multiple bits change of status register
From: Akinobu Mita <hidden>
Date: 2017-01-15 13:15:43
Also in:
linux-devicetree
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2017-01-15 · Re: [PATCH v2 4/5] Input: mpr121 - handle multiple bits change of status register · Dmitry Torokhov <hidden>
This driver reports input events on their interrupts which are triggered by the sensor's status register changes. But only single bit change is reported in the interrupt handler. So if there are multiple bits are changed at almost the same time, other press or release events are ignored. This fixes it by detecting all changed bits in the status register. Cc: Dmitry Torokhov <redacted> Signed-off-by: Akinobu Mita <redacted> --- * Use for_each_set_bit() to search changed bit drivers/input/keyboard/mpr121_touchkey.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/input/keyboard/mpr121_touchkey.c b/drivers/input/keyboard/mpr121_touchkey.c
index 2558c60..a0210ae 100644
--- a/drivers/input/keyboard/mpr121_touchkey.c
+++ b/drivers/input/keyboard/mpr121_touchkey.c@@ -86,7 +86,8 @@ static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id) struct mpr121_touchkey *mpr121 = dev_id; struct i2c_client *client = mpr121->client; struct input_dev *input = mpr121->input_dev; - unsigned int key_num, key_val, pressed; + unsigned long bit_changed; + unsigned int key_num; int reg; reg = i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_1_ADDR);
@@ -104,18 +105,22 @@ static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id) reg &= TOUCH_STATUS_MASK; /* use old press bit to figure out which bit changed */ - key_num = ffs(reg ^ mpr121->statusbits) - 1; - pressed = reg & (1 << key_num); + bit_changed = reg ^ mpr121->statusbits; mpr121->statusbits = reg; + for_each_set_bit(key_num, &bit_changed, mpr121->keycount) { + unsigned int key_val, pressed; - key_val = mpr121->keycodes[key_num]; + pressed = reg & (1 << key_num); + key_val = mpr121->keycodes[key_num]; - input_event(input, EV_MSC, MSC_SCAN, key_num); - input_report_key(input, key_val, pressed); - input_sync(input); + input_event(input, EV_MSC, MSC_SCAN, key_num); + input_report_key(input, key_val, pressed); + + dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val, + pressed ? "pressed" : "released"); - dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val, - pressed ? "pressed" : "released"); + } + input_sync(input); out: return IRQ_HANDLED;
--
2.7.4
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