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Subject[PING] [PATCH v3] Input: elantech - fix x_max/y_max values
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Ping...

Can I do anything to have this patch merged in upstream, please?

Thanks
Bernd.


On 6/6/21 8:44 AM, Bernd Edlinger wrote:
> Ping...
>
> On 5/30/21 6:35 AM, Bernd Edlinger wrote:
>> Since commit 37548659bb22 ("Input: elantech - query the min/max information beforehand too")
>> moved the querying of the x_max/y_max values from
>> elantech_set_input_params to elantech_query_info,
>> the returned x_max/y_max values are different than before,
>> at least for some firmware versions.
>>
>> The reason is likely that this is now done before
>> elantech_set_absolute_mode does run. So it may happen that
>> the returned values are exactly half of what they used to be,
>> which makes input_report_abs in PS/2 mode report ABS_X values which
>> exceed the x_max value, which is very annoying since the mouse stops
>> to move then, and ABS_Y value become negative, which is benign.
>>
>> This was observed with a MSI GX70 laptop:
>>
>> elantech: assuming hardware version 3 (with firmware version 0x250f01)
>> elantech: Synaptics capabilities query result 0x18, 0x17, 0x0b.
>> elantech: Elan sample query result 05, 0e, 00
>> input: ETPS/2 Elantech Touchpad as /devices/platform/i8042/serio...
>>
>> This patch moves the code sending the ETP_FW_ID_QUERY command to
>> the function elantech_set_range and calls this function in
>> elantech_query_info for hw_version == 4, but for hw_version < 4 it is
>> called in elantech_setup_ps2 after the function elantech_set_absolute_mode.
>>
>> It is right to switch the touchpad into absolute mode first to get valid
>> results from the ID query call in hardware version 2 and 3.
>>
>> There is no way how this change can affect the state of the firmware
>> when elantech_setup_smbus is called later, since that can only happen for
>> hardware version 4, see elantech_init_smbusand elantech_use_host_notify
>> which uses ETP_NEW_IC_SMBUS_HOST_NOTIFY and info->bus.
>>
>> The macro ETP_NEW_IC_SMBUS_HOST_NOTIFY can only return true
>> for (fw_version & 0x0f0000) == 0x0f0000 which implies v4 hardware.
>> The value info->bus can only be unequal to ETP_BUS_PS2_ONLY,
>> if elantech_get_resolution_v4 was called from elantech_query_info,
>> which is again guarded by info->hw_version == 4.
>>
>> Fixes: 37548659bb22 ("Input: elantech - query the min/max information beforehand too")
>>
>> Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
>> ---
>> v3: Do the ID_QUEERY after set absoulute mode for hw_version < 4.
>> Note: It turned out to be more difficult to call elantech_set_absolute_mode
>> from elantech_query_info.
>>
>> drivers/input/mouse/elantech.c | 172 ++++++++++++++++++++++-------------------
>> 1 file changed, 94 insertions(+), 78 deletions(-)
>>
>> diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
>> index 97381e2..5f4a1a4 100644
>> --- a/drivers/input/mouse/elantech.c
>> +++ b/drivers/input/mouse/elantech.c
>> @@ -1078,6 +1078,94 @@ static int elantech_set_absolute_mode(struct psmouse *psmouse)
>> return rc;
>> }
>>
>> +static int elantech_set_range(struct psmouse *psmouse,
>> + struct elantech_device_info *info)
>> +{
>> + unsigned char param[3];
>> + unsigned char traces;
>> +
>> + /* query range information */
>> + switch (info->hw_version) {
>> + case 1:
>> + info->x_min = ETP_XMIN_V1;
>> + info->y_min = ETP_YMIN_V1;
>> + info->x_max = ETP_XMAX_V1;
>> + info->y_max = ETP_YMAX_V1;
>> + break;
>> +
>> + case 2:
>> + if (info->fw_version == 0x020800 ||
>> + info->fw_version == 0x020b00 ||
>> + info->fw_version == 0x020030) {
>> + info->x_min = ETP_XMIN_V2;
>> + info->y_min = ETP_YMIN_V2;
>> + info->x_max = ETP_XMAX_V2;
>> + info->y_max = ETP_YMAX_V2;
>> + } else {
>> + int i;
>> + int fixed_dpi;
>> +
>> + i = (info->fw_version > 0x020800 &&
>> + info->fw_version < 0x020900) ? 1 : 2;
>> +
>> + if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
>> + return -EINVAL;
>> +
>> + fixed_dpi = param[1] & 0x10;
>> +
>> + if (((info->fw_version >> 16) == 0x14) && fixed_dpi) {
>> + if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
>> + return -EINVAL;
>> +
>> + info->x_max = (info->capabilities[1] - i) * param[1] / 2;
>> + info->y_max = (info->capabilities[2] - i) * param[2] / 2;
>> + } else if (info->fw_version == 0x040216) {
>> + info->x_max = 819;
>> + info->y_max = 405;
>> + } else if (info->fw_version == 0x040219 || info->fw_version == 0x040215) {
>> + info->x_max = 900;
>> + info->y_max = 500;
>> + } else {
>> + info->x_max = (info->capabilities[1] - i) * 64;
>> + info->y_max = (info->capabilities[2] - i) * 64;
>> + }
>> + }
>> + break;
>> +
>> + case 3:
>> + if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
>> + return -EINVAL;
>> +
>> + info->x_max = (0x0f & param[0]) << 8 | param[1];
>> + info->y_max = (0xf0 & param[0]) << 4 | param[2];
>> + break;
>> +
>> + case 4:
>> + if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
>> + return -EINVAL;
>> +
>> + info->x_max = (0x0f & param[0]) << 8 | param[1];
>> + info->y_max = (0xf0 & param[0]) << 4 | param[2];
>> + traces = info->capabilities[1];
>> + if ((traces < 2) || (traces > info->x_max))
>> + return -EINVAL;
>> +
>> + info->width = info->x_max / (traces - 1);
>> +
>> + /* column number of traces */
>> + info->x_traces = traces;
>> +
>> + /* row number of traces */
>> + traces = info->capabilities[2];
>> + if ((traces >= 2) && (traces <= info->y_max))
>> + info->y_traces = traces;
>> +
>> + break;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> /*
>> * (value from firmware) * 10 + 790 = dpi
>> * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
>> @@ -1659,7 +1747,6 @@ static int elantech_query_info(struct psmouse *psmouse,
>> struct elantech_device_info *info)
>> {
>> unsigned char param[3];
>> - unsigned char traces;
>> unsigned char ic_body[3];
>>
>> memset(info, 0, sizeof(*info));
>> @@ -1759,85 +1846,9 @@ static int elantech_query_info(struct psmouse *psmouse,
>> psmouse_warn(psmouse,
>> "failed to query resolution data.\n");
>> }
>> - }
>> -
>> - /* query range information */
>> - switch (info->hw_version) {
>> - case 1:
>> - info->x_min = ETP_XMIN_V1;
>> - info->y_min = ETP_YMIN_V1;
>> - info->x_max = ETP_XMAX_V1;
>> - info->y_max = ETP_YMAX_V1;
>> - break;
>> -
>> - case 2:
>> - if (info->fw_version == 0x020800 ||
>> - info->fw_version == 0x020b00 ||
>> - info->fw_version == 0x020030) {
>> - info->x_min = ETP_XMIN_V2;
>> - info->y_min = ETP_YMIN_V2;
>> - info->x_max = ETP_XMAX_V2;
>> - info->y_max = ETP_YMAX_V2;
>> - } else {
>> - int i;
>> - int fixed_dpi;
>> -
>> - i = (info->fw_version > 0x020800 &&
>> - info->fw_version < 0x020900) ? 1 : 2;
>> -
>> - if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
>> - return -EINVAL;
>>
>> - fixed_dpi = param[1] & 0x10;
>> -
>> - if (((info->fw_version >> 16) == 0x14) && fixed_dpi) {
>> - if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
>> - return -EINVAL;
>> -
>> - info->x_max = (info->capabilities[1] - i) * param[1] / 2;
>> - info->y_max = (info->capabilities[2] - i) * param[2] / 2;
>> - } else if (info->fw_version == 0x040216) {
>> - info->x_max = 819;
>> - info->y_max = 405;
>> - } else if (info->fw_version == 0x040219 || info->fw_version == 0x040215) {
>> - info->x_max = 900;
>> - info->y_max = 500;
>> - } else {
>> - info->x_max = (info->capabilities[1] - i) * 64;
>> - info->y_max = (info->capabilities[2] - i) * 64;
>> - }
>> - }
>> - break;
>> -
>> - case 3:
>> - if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
>> - return -EINVAL;
>> -
>> - info->x_max = (0x0f & param[0]) << 8 | param[1];
>> - info->y_max = (0xf0 & param[0]) << 4 | param[2];
>> - break;
>> -
>> - case 4:
>> - if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
>> + if (elantech_set_range(psmouse, info))
>> return -EINVAL;
>> -
>> - info->x_max = (0x0f & param[0]) << 8 | param[1];
>> - info->y_max = (0xf0 & param[0]) << 4 | param[2];
>> - traces = info->capabilities[1];
>> - if ((traces < 2) || (traces > info->x_max))
>> - return -EINVAL;
>> -
>> - info->width = info->x_max / (traces - 1);
>> -
>> - /* column number of traces */
>> - info->x_traces = traces;
>> -
>> - /* row number of traces */
>> - traces = info->capabilities[2];
>> - if ((traces >= 2) && (traces <= info->y_max))
>> - info->y_traces = traces;
>> -
>> - break;
>> }
>>
>> /* check for the middle button: DMI matching or new v4 firmwares */
>> @@ -2037,6 +2048,11 @@ static int elantech_setup_ps2(struct psmouse *psmouse,
>> goto init_fail;
>> }
>>
>> + if (info->hw_version < 4) {
>> + if (elantech_set_range(psmouse, &etd->info))
>> + goto init_fail;
>> + }
>> +
>> if (info->fw_version == 0x381f17) {
>> etd->original_set_rate = psmouse->set_rate;
>> psmouse->set_rate = elantech_set_rate_restore_reg_07;
>>

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