[PATCH 4/5] Input: elantech - provide a sysfs knob for crc_enabled
From: Ulrik De Bie <hidden>
Date: 2014-08-30 14:11:42
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
The detection of crc_enabled is known to fail for Fujitsu H730. A DMI blacklist is added for that, but it can be expected that other laptops will pop up with this. Here a sysfs knob is provided to alter the behaviour of crc_enabled. Writing 0 or 1 to it sets the variable to 0 or 1. Writing 2 to it will perform the detection and set the variable to 0 or 1 according to the result of the detection. Reading it will show the crc_enabled variable (0 or 1). Reported-by: Stefan Valouch <redacted> Tested-by: Stefan Valouch <redacted> Tested-by: Alfredo Gemma <redacted> Signed-off-by: Ulrik De Bie <redacted> --- drivers/input/mouse/elantech.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index e86bbd7..c2fb961 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c@@ -1305,6 +1305,28 @@ static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); } + +/* + * Write a register value for crc_enabled. + * If "2" is given, perform detect again. + */ +static ssize_t elantech_set_int_attr_crc_enabled(struct psmouse *psmouse, + void *data, const char *buf, size_t count) +{ + struct elantech_data *etd = psmouse->private; + unsigned char value; + int err; + + err = kstrtou8(buf, 16, &value); + if (err) + return err; + + etd->crc_enabled = (value == 2) ? elantech_detect_crc_enabled(etd) : + value; + + return count; +} + /* * Write a register value by writing a sysfs entry */
@@ -1360,6 +1382,19 @@ ELANTECH_INT_ATTR(reg_26, 0x26); ELANTECH_INT_ATTR(debug, 0); ELANTECH_INT_ATTR(paritycheck, 0); +#define ELANTECH_INT_ATTR_SETFUNCTION(_name, _register, _setfunction) \ + static struct elantech_attr_data elantech_attr_##_name = { \ + .field_offset = offsetof(struct elantech_data, _name), \ + .reg = _register, \ + }; \ + PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ + &elantech_attr_##_name, \ + elantech_show_int_attr, \ + _setfunction) + +ELANTECH_INT_ATTR_SETFUNCTION(crc_enabled, 0, + elantech_set_int_attr_crc_enabled); + static struct attribute *elantech_attrs[] = { &psmouse_attr_reg_07.dattr.attr, &psmouse_attr_reg_10.dattr.attr,
@@ -1373,6 +1408,7 @@ static struct attribute *elantech_attrs[] = { &psmouse_attr_reg_26.dattr.attr, &psmouse_attr_debug.dattr.attr, &psmouse_attr_paritycheck.dattr.attr, + &psmouse_attr_crc_enabled.dattr.attr, NULL };
--
2.1.0