On Fri, Jan 05, 2018 at 08:23:13AM -0800, Dmitry Torokhov wrote:
> Hi Aaron,
>
> On Fri, Jan 05, 2018 at 09:29:26PM +0800, Aaron Ma wrote:
> > Hi Dmitry:
> >
> > Got the official info from Lenovo:
> > Lenovo introduced new TrackPoint compatible sticks ( ELAN/Alps/NXP
> > sticks) from 2016.
> > These new devices only support the minimum commands described in the
> > spec, which has been used in the current Windows driver.
>
> What is the exact list of the commands supported by each variant?
>
> >
> > Legacy TrackPoint: 0101 – 0E01
> > ALPS: 0102 – FF02
> > ELAN:0103 – FF03
> > NXP: 0104 – FF04
> >
> > 2.4.18 READ SECONDARY ID (x"E1")
> > This command will read the secondary device ID of the pointing device (2
> > bytes). The least significant byte is sent first. For the first byte,
> > the legacy TrackPoint controller from IBM will always return x"01", the
> > pointing stick from ALPS will always return x"02", the pointing stick
> > from Elan will always return x"03”, and the pointing stick from NXP will
> > always return 0x”04". And a second byte which denotes a specific set of
> > functional specifications. Differing ROM versions are used to denote
> > changes within a given functional set.
>
> Can you/Lenovo share the updated spec?
>
> >
> > The new devices (include Legacy ID:01) will not support the sysfs like
> > speed.
> >
> > So it is not right to revert the commit, it is about to add another 0x04
> > ID in it.
> >
> > Old sysfs could be stayed for old legacy device ID:01 or removed.
>
> No, because there are devices that have trackpoints properly
> implementing the protocol, before Lenovo started their "innovation".
>
> Do we have any way to distinguish between properly implemented
> trackpoints and Lenovo "improved" ones? I played with gen3 Carbon, and
> while it does not error out on "speed" attribute, unlike gen5, it still
> has no visible effects. Additionally, the "press to select"
> functionality seems to be disabled, and trying to enable it via sysfs
> results in register content being reverted to the original "disabled"
> setting in a second or two. Setting to swap X and Y axes does not work
> either, not sure about other bits of that control register.
> "sensitivity" does work though, again unlike my gen5.
>
> Thanks.
>
> --
> Dmitry
Guys, could you please try the patch below? It will not solve the
"speed" issue on 0x01 devices, but hopefully we won't be exposing
non-existing controls on others.
Thanks!
--
Dmitry
Input: trackpoint - only expose supported controls for Elan, ALPS and NXP
From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
The newer trackpoints from ALPS, Elan and NXP implement a very limited
subset of extended commands and controls that the original trackpoints
implemented, so we should not be exposing not working controls in sysfs.
The newer trackpoints also do not implement "Power On Reset" or "Read
Extended Button Status", so we should not be using these commands during
initialization.
While we are at it, let's change "unsigned char" to u8 for byte data or
bool for booleans and use better suited error codes instead of -1.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/input/mouse/trackpoint.c | 241 +++++++++++++++++++++++---------------
drivers/input/mouse/trackpoint.h | 34 +++--
2 files changed, 168 insertions(+), 107 deletions(-)
diff --git a/drivers/input/mouse/trackpoint.c b/drivers/input/mouse/trackpoint.c
index 0871010f18d5..0ca80f465359 100644
--- a/drivers/input/mouse/trackpoint.c
+++ b/drivers/input/mouse/trackpoint.c
@@ -19,6 +19,13 @@
#include "psmouse.h"
#include "trackpoint.h"
+static const char * const trackpoint_variants[] = {
+ [TP_VARIANT_IBM] = "IBM",
+ [TP_VARIANT_ALPS] = "ALPS",
+ [TP_VARIANT_ELAN] = "Elan",
+ [TP_VARIANT_NXP] = "NXP",
+};
+
/*
* Power-on Reset: Resets all trackpoint parameters, including RAM values,
* to defaults.
@@ -26,7 +33,7 @@
*/
static int trackpoint_power_on_reset(struct ps2dev *ps2dev)
{
- unsigned char results[2];
+ u8 results[2];
int tries = 0;
/* Issue POR command, and repeat up to once if 0xFC00 received */
@@ -38,7 +45,7 @@ static int trackpoint_power_on_reset(struct ps2dev *ps2dev)
/* Check for success response -- 0xAA00 */
if (results[0] != 0xAA || results[1] != 0x00)
- return -1;
+ return -ENODEV;
return 0;
}
@@ -46,8 +53,7 @@ static int trackpoint_power_on_reset(struct ps2dev *ps2dev)
/*
* Device IO: read, write and toggle bit
*/
-static int trackpoint_read(struct ps2dev *ps2dev,
- unsigned char loc, unsigned char *results)
+static int trackpoint_read(struct ps2dev *ps2dev, u8 loc, u8 *results)
{
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) {
@@ -57,8 +63,7 @@ static int trackpoint_read(struct ps2dev *ps2dev,
return 0;
}
-static int trackpoint_write(struct ps2dev *ps2dev,
- unsigned char loc, unsigned char val)
+static int trackpoint_write(struct ps2dev *ps2dev, u8 loc, u8 val)
{
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) ||
@@ -70,8 +75,7 @@ static int trackpoint_write(struct ps2dev *ps2dev,
return 0;
}
-static int trackpoint_toggle_bit(struct ps2dev *ps2dev,
- unsigned char loc, unsigned char mask)
+static int trackpoint_toggle_bit(struct ps2dev *ps2dev, u8 loc, u8 mask)
{
/* Bad things will happen if the loc param isn't in this range */
if (loc < 0x20 || loc >= 0x2F)
@@ -87,11 +91,11 @@ static int trackpoint_toggle_bit(struct ps2dev *ps2dev,
return 0;
}
-static int trackpoint_update_bit(struct ps2dev *ps2dev, unsigned char loc,
- unsigned char mask, unsigned char value)
+static int trackpoint_update_bit(struct ps2dev *ps2dev,
+ u8 loc, u8 mask, u8 value)
{
int retval = 0;
- unsigned char data;
+ u8 data;
trackpoint_read(ps2dev, loc, &data);
if (((data & mask) == mask) != !!value)
@@ -105,17 +109,18 @@ static int trackpoint_update_bit(struct ps2dev *ps2dev, unsigned char loc,
*/
struct trackpoint_attr_data {
size_t field_offset;
- unsigned char command;
- unsigned char mask;
- unsigned char inverted;
- unsigned char power_on_default;
+ u8 command;
+ u8 mask;
+ bool inverted;
+ u8 power_on_default;
};
-static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse, void *data, char *buf)
+static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse,
+ void *data, char *buf)
{
struct trackpoint_data *tp = psmouse->private;
struct trackpoint_attr_data *attr = data;
- unsigned char value = *(unsigned char *)((char *)tp + attr->field_offset);
+ u8 value = *(u8 *)((void *)tp + attr->field_offset);
if (attr->inverted)
value = !value;
@@ -128,8 +133,8 @@ static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data,
{
struct trackpoint_data *tp = psmouse->private;
struct trackpoint_attr_data *attr = data;
- unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset);
- unsigned char value;
+ u8 *field = (void *)tp + attr->field_offset;
+ u8 value;
int err;
err = kstrtou8(buf, 10, &value);
@@ -157,17 +162,14 @@ static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data,
{
struct trackpoint_data *tp = psmouse->private;
struct trackpoint_attr_data *attr = data;
- unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset);
- unsigned int value;
+ bool *field = (void *)tp + attr->field_offset;
+ bool value;
int err;
- err = kstrtouint(buf, 10, &value);
+ err = kstrtobool(buf, &value);
if (err)
return err;
- if (value > 1)
- return -EINVAL;
-
if (attr->inverted)
value = !value;
@@ -193,30 +195,6 @@ PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
&trackpoint_attr_##_name, \
trackpoint_show_int_attr, trackpoint_set_bit_attr)
-#define TRACKPOINT_UPDATE_BIT(_psmouse, _tp, _name) \
-do { \
- struct trackpoint_attr_data *_attr = &trackpoint_attr_##_name; \
- \
- trackpoint_update_bit(&_psmouse->ps2dev, \
- _attr->command, _attr->mask, _tp->_name); \
-} while (0)
-
-#define TRACKPOINT_UPDATE(_power_on, _psmouse, _tp, _name) \
-do { \
- if (!_power_on || \
- _tp->_name != trackpoint_attr_##_name.power_on_default) { \
- if (!trackpoint_attr_##_name.mask) \
- trackpoint_write(&_psmouse->ps2dev, \
- trackpoint_attr_##_name.command, \
- _tp->_name); \
- else \
- TRACKPOINT_UPDATE_BIT(_psmouse, _tp, _name); \
- } \
-} while (0)
-
-#define TRACKPOINT_SET_POWER_ON_DEFAULT(_tp, _name) \
- (_tp->_name = trackpoint_attr_##_name.power_on_default)
-
TRACKPOINT_INT_ATTR(sensitivity, TP_SENS, TP_DEF_SENS);
TRACKPOINT_INT_ATTR(speed, TP_SPEED, TP_DEF_SPEED);
TRACKPOINT_INT_ATTR(inertia, TP_INERTIA, TP_DEF_INERTIA);
@@ -229,13 +207,33 @@ TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME, TP_DEF_Z_TIME);
TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV, TP_DEF_JENKS_CURV);
TRACKPOINT_INT_ATTR(drift_time, TP_DRIFT_TIME, TP_DEF_DRIFT_TIME);
-TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, 0,
+TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, false,
TP_DEF_PTSON);
-TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, 0,
+TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, false,
TP_DEF_SKIPBACK);
-TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, 1,
+TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, true,
TP_DEF_EXT_DEV);
+static bool trackpoint_is_attr_available(struct psmouse *psmouse,
+ struct attribute *attr)
+{
+ struct trackpoint_data *tp = psmouse->private;
+
+ return tp->variant_id == TP_VARIANT_IBM ||
+ attr == &psmouse_attr_sensitivity.dattr.attr ||
+ attr == &psmouse_attr_press_to_select.dattr.attr;
+}
+
+static umode_t trackpoint_is_attr_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct serio *serio = to_serio_port(dev);
+ struct psmouse *psmouse = serio_get_drvdata(serio);
+
+ return trackpoint_is_attr_available(psmouse, attr) ? attr->mode : 0;
+}
+
static struct attribute *trackpoint_attrs[] = {
&psmouse_attr_sensitivity.dattr.attr,
&psmouse_attr_speed.dattr.attr,
@@ -255,24 +253,56 @@ static struct attribute *trackpoint_attrs[] = {
};
static struct attribute_group trackpoint_attr_group = {
- .attrs = trackpoint_attrs,
+ .is_visible = trackpoint_is_attr_visible,
+ .attrs = trackpoint_attrs,
};
-static int trackpoint_start_protocol(struct psmouse *psmouse, unsigned char *firmware_id)
-{
- unsigned char param[2] = { 0 };
+#define TRACKPOINT_UPDATE(_power_on, _psmouse, _tp, _name) \
+do { \
+ struct trackpoint_attr_data *_attr = &trackpoint_attr_##_name; \
+ \
+ if ((!_power_on || _tp->_name != _attr->power_on_default) && \
+ trackpoint_is_attr_available(_psmouse, \
+ &psmouse_attr_##_name.dattr.attr)) { \
+ if (!_attr->mask) \
+ trackpoint_write(&_psmouse->ps2dev, \
+ _attr->command, _tp->_name); \
+ else \
+ trackpoint_update_bit(&_psmouse->ps2dev, \
+ _attr->command, _attr->mask, \
+ _tp->_name); \
+ } \
+} while (0)
- if (ps2_command(&psmouse->ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID)))
- return -1;
+#define TRACKPOINT_SET_POWER_ON_DEFAULT(_tp, _name) \
+do { \
+ _tp->_name = trackpoint_attr_##_name.power_on_default; \
+} while (0)
- /* add new TP ID. */
- if (!(param[0] & TP_MAGIC_IDENT))
- return -1;
+static int trackpoint_start_protocol(struct psmouse *psmouse,
+ u8 *variant_id, u8 *firmware_id)
+{
+ u8 param[2] = { 0 };
+ int error;
- if (firmware_id)
- *firmware_id = param[1];
+ error = ps2_command(&psmouse->ps2dev,
+ param, MAKE_PS2_CMD(0, 2, TP_READ_ID));
+ if (error)
+ return error;
+
+ switch (param[0]) {
+ case TP_VARIANT_IBM:
+ case TP_VARIANT_ALPS:
+ case TP_VARIANT_ELAN:
+ case TP_VARIANT_NXP:
+ if (variant_id)
+ *variant_id = param[0];
+ if (firmware_id)
+ *firmware_id = param[1];
+ break;
+ }
- return 0;
+ return -ENODEV;
}
/*
@@ -285,7 +315,7 @@ static int trackpoint_sync(struct psmouse *psmouse, bool in_power_on_state)
{
struct trackpoint_data *tp = psmouse->private;
- if (!in_power_on_state) {
+ if (!in_power_on_state && tp->variant_id == TP_VARIANT_IBM) {
/*
* Disable features that may make device unusable
* with this driver.
@@ -347,7 +377,8 @@ static void trackpoint_defaults(struct trackpoint_data *tp)
static void trackpoint_disconnect(struct psmouse *psmouse)
{
- sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group);
+ device_remove_group(&psmouse->ps2dev.serio->dev,
+ &trackpoint_attr_group);
kfree(psmouse->private);
psmouse->private = NULL;
@@ -355,14 +386,20 @@ static void trackpoint_disconnect(struct psmouse *psmouse)
static int trackpoint_reconnect(struct psmouse *psmouse)
{
- int reset_fail;
+ struct trackpoint_data *tp = psmouse->private;
+ int error;
+ bool was_reset;
- if (trackpoint_start_protocol(psmouse, NULL))
- return -1;
+ error = trackpoint_start_protocol(psmouse, NULL, NULL);
+ if (error)
+ return error;
- reset_fail = trackpoint_power_on_reset(&psmouse->ps2dev);
- if (trackpoint_sync(psmouse, !reset_fail))
- return -1;
+ was_reset = tp->variant_id == TP_VARIANT_IBM &&
+ trackpoint_power_on_reset(&psmouse->ps2dev) == 0;
+
+ error = trackpoint_sync(psmouse, was_reset);
+ if (error)
+ return error;
return 0;
}
@@ -370,46 +407,62 @@ static int trackpoint_reconnect(struct psmouse *psmouse)
int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
- unsigned char firmware_id;
- unsigned char button_info;
+ struct trackpoint_data *tp;
+ u8 variant_id;
+ u8 firmware_id;
+ u8 button_info;
int error;
- if (trackpoint_start_protocol(psmouse, &firmware_id))
- return -1;
+ error = trackpoint_start_protocol(psmouse, &variant_id, &firmware_id);
+ if (error)
+ return error;
if (!set_properties)
return 0;
- if (trackpoint_read(ps2dev, TP_EXT_BTN, &button_info)) {
- psmouse_warn(psmouse, "failed to get extended button data, assuming 3 buttons\n");
- button_info = 0x33;
- }
-
- psmouse->private = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL);
- if (!psmouse->private)
+ tp = kzalloc(sizeof(*tp), GFP_KERNEL);
+ if (!tp)
return -ENOMEM;
- psmouse->vendor = "IBM";
+ trackpoint_defaults(tp);
+ tp->variant_id = variant_id;
+ tp->firmware_id = firmware_id;
+
+ psmouse->private = tp;
+
+ psmouse->vendor = trackpoint_variants[variant_id];
psmouse->name = "TrackPoint";
psmouse->reconnect = trackpoint_reconnect;
psmouse->disconnect = trackpoint_disconnect;
+ if (variant_id != TP_VARIANT_IBM) {
+ /* Newer variants do not support extended button query. */
+ button_info = 0x33;
+ } else {
+ error = trackpoint_read(ps2dev, TP_EXT_BTN, &button_info);
+ if (error) {
+ psmouse_warn(psmouse,
+ "failed to get extended button data, assuming 3 buttons\n");
+ button_info = 0x33;
+ }
+ }
+
if ((button_info & 0x0f) >= 3)
- __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
+ input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
__set_bit(INPUT_PROP_POINTER, psmouse->dev->propbit);
__set_bit(INPUT_PROP_POINTING_STICK, psmouse->dev->propbit);
- trackpoint_defaults(psmouse->private);
-
- error = trackpoint_power_on_reset(ps2dev);
-
- /* Write defaults to TP only if reset fails. */
- if (error)
+ if (variant_id != TP_VARIANT_IBM ||
+ trackpoint_power_on_reset(ps2dev) != 0) {
+ /*
+ * Write defaults to TP if we did not reset the trackpoint.
+ */
trackpoint_sync(psmouse, false);
+ }
- error = sysfs_create_group(&ps2dev->serio->dev.kobj, &trackpoint_attr_group);
+ error = device_add_group(&ps2dev->serio->dev, &trackpoint_attr_group);
if (error) {
psmouse_err(psmouse,
"failed to create sysfs attributes, error: %d\n",
@@ -420,8 +473,8 @@ int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
}
psmouse_info(psmouse,
- "IBM TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
- firmware_id,
+ "%s TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
+ psmouse->vendor, firmware_id,
(button_info & 0xf0) >> 4, button_info & 0x0f);
return 0;
diff --git a/drivers/input/mouse/trackpoint.h b/drivers/input/mouse/trackpoint.h
index 88055755f82e..10a039148234 100644
--- a/drivers/input/mouse/trackpoint.h
+++ b/drivers/input/mouse/trackpoint.h
@@ -21,10 +21,16 @@
#define TP_COMMAND 0xE2 /* Commands start with this */
#define TP_READ_ID 0xE1 /* Sent for device identification */
-#define TP_MAGIC_IDENT 0x03 /* Sent after a TP_READ_ID followed */
- /* by the firmware ID */
- /* Firmware ID includes 0x1, 0x2, 0x3 */
+/*
+ * Valid first byte responses to the "Read Secondary ID" (0xE1) command.
+ * 0x01 was the original IBM trackpoint, others implement very limited
+ * subset of trackpoint features.
+ */
+#define TP_VARIANT_IBM 0x01
+#define TP_VARIANT_ALPS 0x02
+#define TP_VARIANT_ELAN 0x03
+#define TP_VARIANT_NXP 0x04
/*
* Commands
@@ -136,18 +142,20 @@
#define MAKE_PS2_CMD(params, results, cmd) ((params<<12) | (results<<8) | (cmd))
-struct trackpoint_data
-{
- unsigned char sensitivity, speed, inertia, reach;
- unsigned char draghys, mindrag;
- unsigned char thresh, upthresh;
- unsigned char ztime, jenks;
- unsigned char drift_time;
+struct trackpoint_data {
+ u8 variant_id;
+ u8 firmware_id;
+
+ u8 sensitivity, speed, inertia, reach;
+ u8 draghys, mindrag;
+ u8 thresh, upthresh;
+ u8 ztime, jenks;
+ u8 drift_time;
/* toggles */
- unsigned char press_to_select;
- unsigned char skipback;
- unsigned char ext_dev;
+ bool press_to_select;
+ bool skipback;
+ bool ext_dev;
};
#ifdef CONFIG_MOUSE_PS2_TRACKPOINT
--
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