diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2014-05-05 09:36:43 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-07 13:25:36 -0700 |
| commit | 5e02a153d1a0d5131a9943762f01179b42f074e2 (patch) | |
| tree | 8869255bf2a7eebd5036b3c819549c97908bfd79 /drivers/input | |
| parent | 7f63e60bd6e1843fd3510d4cbc036e3d388944d1 (diff) | |
Input: elantech - fix touchpad initialization on Gigabyte U2442
commit 36189cc3cd57ab0f1cd75241f93fe01de928ac06 upstream.
The hw_version 3 Elantech touchpad on the Gigabyte U2442 does not accept
0x0b as initialization value for r10, this stand-alone version of the
driver: http://planet76.com/drivers/elantech/psmouse-elantech-v6.tar.bz2
Uses 0x03 which does work, so this means not setting bit 3 of r10 which
sets: "Enable Real H/W Resolution In Absolute mode"
Which will result in half the x and y resolution we get with that bit set,
so simply not setting it everywhere is not a solution. We've been unable to
find a way to identify touchpads where setting the bit will fail, so this
patch uses a dmi based blacklist for this.
https://bugzilla.kernel.org/show_bug.cgi?id=61151
Reported-by: Philipp Wolfer <ph.wolfer@gmail.com>
Tested-by: Philipp Wolfer <ph.wolfer@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/mouse/elantech.c | 26 | ||||
| -rw-r--r-- | drivers/input/mouse/elantech.h | 1 |
2 files changed, 26 insertions, 1 deletions
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c index 1fb1a7b5a754..76f1d37ac0ff 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -11,6 +11,7 @@ */ #include <linux/delay.h> +#include <linux/dmi.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/input.h> @@ -801,7 +802,11 @@ static int elantech_set_absolute_mode(struct psmouse *psmouse) break; case 3: - etd->reg_10 = 0x0b; + if (etd->set_hw_resolution) + etd->reg_10 = 0x0b; + else + etd->reg_10 = 0x03; + if (elantech_write_reg(psmouse, 0x10, etd->reg_10)) rc = -1; @@ -1301,6 +1306,22 @@ static int elantech_reconnect(struct psmouse *psmouse) } /* + * Some hw_version 3 models go into error state when we try to set bit 3 of r10 + */ +static const struct dmi_system_id no_hw_res_dmi_table[] = { +#if defined(CONFIG_DMI) && defined(CONFIG_X86) + { + /* Gigabyte U2442 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), + DMI_MATCH(DMI_PRODUCT_NAME, "U2442"), + }, + }, +#endif + { } +}; + +/* * determine hardware version and set some properties according to it. */ static int elantech_set_properties(struct elantech_data *etd) @@ -1351,6 +1372,9 @@ static int elantech_set_properties(struct elantech_data *etd) etd->reports_pressure = true; } + /* Enable real hardware resolution on hw_version 3 ? */ + etd->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table); + return 0; } diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h index 46db3be45ac9..c1c15ab6872d 100644 --- a/drivers/input/mouse/elantech.h +++ b/drivers/input/mouse/elantech.h @@ -129,6 +129,7 @@ struct elantech_data { bool paritycheck; bool jumpy_cursor; bool reports_pressure; + bool set_hw_resolution; unsigned char hw_version; unsigned int fw_version; unsigned int single_finger_reports; |