From 64757eba624422f8d30e4248f6f10719ac8b2311 Mon Sep 17 00:00:00 2001 From: Doug Anderson Date: Sun, 29 Dec 2013 16:52:46 -0800 Subject: [PATCH] Input: cros_ec_keyb - fix problems with backslash The driver can't deal with two entries its keymap having the same keycode. When this happens it will get confused about whether the key is down or up and will cause some screwy behavior. We need to have two entries for KEY_BACKSLASH to handle US and UK keyboards. Specifically: * On the US keyboard the backslash key (above enter) is r3 c11 and is supposed to be reported as BACKSLASH. * On the UK keyboard the # key (left of enter) is r4 c10 and is supposed to be reported as BACKSLASH. * On the UK keyboard the \ key (left of Z) is r2 c7 and is supposed to be reported as KEY_102ND. Note that both keyboards (US and UK) have only one physical backslash key so the constraint that each physical key should have its own keycode still stands. Signed-off-by: Doug Anderson Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/cros_ec_keyb.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c index 7e8b0a52af25..408379669d3c 100644 --- a/drivers/input/keyboard/cros_ec_keyb.c +++ b/drivers/input/keyboard/cros_ec_keyb.c @@ -38,6 +38,7 @@ * @row_shift: log2 or number of rows, rounded up * @keymap_data: Matrix keymap data used to convert to keyscan values * @ghost_filter: true to enable the matrix key-ghosting filter + * @old_kb_state: bitmap of keys pressed last scan * @dev: Device pointer * @idev: Input device * @ec: Top level ChromeOS device to use to talk to EC @@ -49,6 +50,7 @@ struct cros_ec_keyb { int row_shift; const struct matrix_keymap_data *keymap_data; bool ghost_filter; + uint8_t *old_kb_state; struct device *dev; struct input_dev *idev; @@ -135,6 +137,7 @@ static void cros_ec_keyb_process(struct cros_ec_keyb *ckdev, struct input_dev *idev = ckdev->idev; int col, row; int new_state; + int old_state; int num_cols; num_cols = len; @@ -153,18 +156,19 @@ static void cros_ec_keyb_process(struct cros_ec_keyb *ckdev, for (row = 0; row < ckdev->rows; row++) { int pos = MATRIX_SCAN_CODE(row, col, ckdev->row_shift); const unsigned short *keycodes = idev->keycode; - int code; - code = keycodes[pos]; new_state = kb_state[col] & (1 << row); - if (!!new_state != test_bit(code, idev->key)) { + old_state = ckdev->old_kb_state[col] & (1 << row); + if (new_state != old_state) { dev_dbg(ckdev->dev, "changed: [r%d c%d]: byte %02x\n", row, col, new_state); - input_report_key(idev, code, new_state); + input_report_key(idev, keycodes[pos], + new_state); } } + ckdev->old_kb_state[col] = kb_state[col]; } input_sync(ckdev->idev); } @@ -226,6 +230,9 @@ static int cros_ec_keyb_probe(struct platform_device *pdev) &ckdev->cols); if (err) return err; + ckdev->old_kb_state = devm_kzalloc(&pdev->dev, ckdev->cols, GFP_KERNEL); + if (!ckdev->old_kb_state) + return -ENOMEM; idev = devm_input_allocate_device(&pdev->dev); if (!idev) -- GitLab