Input: appletouch - prepare for geyser 3/4 handling

Split complete function into separate functions for GEYSER1/2 and GEYSER 3/4.

Signed-off-by: Sven Anders <anders@anduras.de>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 197 insertions, 69 deletions

diff --git a/drivers/input/mouse/appletouch.c b/drivers/input/mouse/appletouch.c
index 1f41ae94f26b..36ebe5c25ee3 100644
--- a/drivers/input/mouse/appletouch.c
+++ b/drivers/input/mouse/appletouch.c
@@ -327,11 +327,14 @@ static inline void atp_report_fingers(struct input_dev *input, int fingers)
         input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
 }
 
-static void atp_complete(struct urb *urb)
+/* Check URB status and for correct length of data package */
+
+#define ATP_URB_STATUS_SUCCESS          0
+#define ATP_URB_STATUS_ERROR            1
+#define ATP_URB_STATUS_ERROR_FATAL      2
+
+static int atp_status_check(struct urb *urb)
 {
-        int x, y, x_z, y_z, x_f, y_f;
-        int retval, i, j;
-        int key;
         struct atp *dev = urb->context;
 
         switch (urb->status) {
@@ -351,11 +354,12 @@ static void atp_complete(struct urb *urb)
                 /* This urb is terminated, clean up */
                 dbg("atp_complete: urb shutting down with status: %d",
                     urb->status);
-                return;
+                return ATP_URB_STATUS_ERROR_FATAL;
+
         default:
                 dbg("atp_complete: nonzero urb status received: %d",
                     urb->status);
-                goto exit;
+                return ATP_URB_STATUS_ERROR;
         }
 
         /* drop incomplete datasets */
@@ -363,30 +367,33 @@ static void atp_complete(struct urb *urb)
                 dprintk("appletouch: incomplete data package"
                         " (first byte: %d, length: %d).\n",
                         dev->data[0], dev->urb->actual_length);
-                goto exit;
+                return ATP_URB_STATUS_ERROR;
         }
 
-        /* reorder the sensors values */
-        if (dev->type == ATP_GEYSER3 || dev->type == ATP_GEYSER4) {
-                memset(dev->xy_cur, 0, sizeof(dev->xy_cur));
+        return ATP_URB_STATUS_SUCCESS;
+}
 
-                /*
-                 * The values are laid out like this:
-                 * -, Y1, Y2, -, Y3, Y4, -, ..., -, X1, X2, -, X3, X4, ...
-                 * '-' is an unused value.
-                 */
+/*
+ * USB interrupt callback functions
+ */
 
-                /* read X values */
-                for (i = 0, j = 19; i < 20; i += 2, j += 3) {
-                        dev->xy_cur[i] = dev->data[j + 1];
-                        dev->xy_cur[i + 1] = dev->data[j + 2];
-                }
-                /* read Y values */
-                for (i = 0, j = 1; i < 9; i += 2, j += 3) {
-                        dev->xy_cur[ATP_XSENSORS + i] = dev->data[j + 1];
-                        dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 2];
-                }
-        } else if (dev->type == ATP_GEYSER2) {
+/* Interrupt function for older touchpads: FOUNTAIN/GEYSER1/GEYSER2 */
+
+static void atp_complete_geyser_1_2(struct urb *urb)
+{
+        int x, y, x_z, y_z, x_f, y_f;
+        int retval, i, j;
+        int key;
+        struct atp *dev = urb->context;
+        int status = atp_status_check(urb);
+
+        if (status == ATP_URB_STATUS_ERROR_FATAL)
+                return;
+        else if (status == ATP_URB_STATUS_ERROR)
+                goto exit;
+
+        /* reorder the sensors values */
+        if (dev->type == ATP_GEYSER2) {
                 memset(dev->xy_cur, 0, sizeof(dev->xy_cur));
 
                 /*
@@ -427,33 +434,146 @@ static void atp_complete(struct urb *urb)
                 /* first sample */
                 dev->valid = true;
                 dev->x_old = dev->y_old = -1;
+
+                /* Store first sample */
                 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
 
-                if (dev->size_detect_done ||
-                    dev->type == ATP_GEYSER3) /* No 17" Macbooks (yet) */
+                /* Perform size detection, if not done already */
+                if (!dev->size_detect_done) {
+
+                        /* 17" Powerbooks have extra X sensors */
+                        for (i = (dev->type == ATP_GEYSER2 ? 15 : 16);
+                             i < ATP_XSENSORS; i++) {
+                                if (!dev->xy_cur[i])
+                                        continue;
+
+                                printk(KERN_INFO
+                                        "appletouch: 17\" model detected.\n");
+
+                                if (dev->type == ATP_GEYSER2)
+                                        input_set_abs_params(dev->input, ABS_X,
+                                                             0,
+                                                             (20 - 1) *
+                                                             ATP_XFACT - 1,
+                                                             ATP_FUZZ, 0);
+                                else
+                                        input_set_abs_params(dev->input, ABS_X,
+                                                             0,
+                                                             (26 - 1) *
+                                                             ATP_XFACT - 1,
+                                                             ATP_FUZZ, 0);
+                                break;
+                        }
+
+                        dev->size_detect_done = 1;
                         goto exit;
+                }
+        }
 
-                /* 17" Powerbooks have extra X sensors */
-                for (i = (dev->type == ATP_GEYSER2 ? 15 : 16);
-                     i < ATP_XSENSORS; i++) {
-                        if (!dev->xy_cur[i])
-                                continue;
-
-                        printk(KERN_INFO "appletouch: 17\" model detected.\n");
-                        if (dev->type == ATP_GEYSER2)
-                                input_set_abs_params(dev->input, ABS_X, 0,
-                                                     (20 - 1) *
-                                                     ATP_XFACT - 1,
-                                                     ATP_FUZZ, 0);
-                        else
-                                input_set_abs_params(dev->input, ABS_X, 0,
-                                                     (ATP_XSENSORS - 1) *
-                                                     ATP_XFACT - 1,
-                                                     ATP_FUZZ, 0);
-                        break;
+        for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) {
+                /* accumulate the change */
+                signed char change = dev->xy_old[i] - dev->xy_cur[i];
+                dev->xy_acc[i] -= change;
+
+                /* prevent down drifting */
+                if (dev->xy_acc[i] < 0)
+                        dev->xy_acc[i] = 0;
+        }
+
+        memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
+
+        dbg_dump("accumulator", dev->xy_acc);
+
+        x = atp_calculate_abs(dev->xy_acc, ATP_XSENSORS,
+                              ATP_XFACT, &x_z, &x_f);
+        y = atp_calculate_abs(dev->xy_acc + ATP_XSENSORS, ATP_YSENSORS,
+                              ATP_YFACT, &y_z, &y_f);
+        key = dev->data[dev->datalen - 1] & 1;
+
+        if (x && y) {
+                if (dev->x_old != -1) {
+                        x = (dev->x_old * 3 + x) >> 2;
+                        y = (dev->y_old * 3 + y) >> 2;
+                        dev->x_old = x;
+                        dev->y_old = y;
+
+                        if (debug > 1)
+                                printk(KERN_DEBUG "appletouch: "
+                                        "X: %3d Y: %3d Xz: %3d Yz: %3d\n",
+                                        x, y, x_z, y_z);
+
+                        input_report_key(dev->input, BTN_TOUCH, 1);
+                        input_report_abs(dev->input, ABS_X, x);
+                        input_report_abs(dev->input, ABS_Y, y);
+                        input_report_abs(dev->input, ABS_PRESSURE,
+                                         min(ATP_PRESSURE, x_z + y_z));
+                        atp_report_fingers(dev->input, max(x_f, y_f));
                 }
+                dev->x_old = x;
+                dev->y_old = y;
+
+        } else if (!x && !y) {
+
+                dev->x_old = dev->y_old = -1;
+                input_report_key(dev->input, BTN_TOUCH, 0);
+                input_report_abs(dev->input, ABS_PRESSURE, 0);
+                atp_report_fingers(dev->input, 0);
+
+                /* reset the accumulator on release */
+                memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
+        }
+
+        input_report_key(dev->input, BTN_LEFT, key);
+        input_sync(dev->input);
+
+ exit:
+        retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
+        if (retval)
+                err("atp_complete: usb_submit_urb failed with result %d",
+                    retval);
+}
+
+/* Interrupt function for older touchpads: GEYSER3/GEYSER4 */
+
+static void atp_complete_geyser_3_4(struct urb *urb)
+{
+        int x, y, x_z, y_z, x_f, y_f;
+        int retval, i, j;
+        int key;
+        struct atp *dev = urb->context;
+        int status = atp_status_check(urb);
+
+        if (status == ATP_URB_STATUS_ERROR_FATAL)
+                return;
+        else if (status == ATP_URB_STATUS_ERROR)
+                goto exit;
+
+        /* Reorder the sensors values:
+         *
+         * The values are laid out like this:
+         * -, Y1, Y2, -, Y3, Y4, -, ..., -, X1, X2, -, X3, X4, ...
+         * '-' is an unused value.
+         */
+
+        /* read X values */
+        for (i = 0, j = 19; i < 20; i += 2, j += 3) {
+                dev->xy_cur[i] = dev->data[j + 1];
+                dev->xy_cur[i + 1] = dev->data[j + 2];
+        }
+        /* read Y values */
+        for (i = 0, j = 1; i < 9; i += 2, j += 3) {
+                dev->xy_cur[ATP_XSENSORS + i] = dev->data[j + 1];
+                dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 2];
+        }
+
+        dbg_dump("sample", dev->xy_cur);
+
+        if (!dev->valid) {
+                /* first sample */
+                dev->valid = true;
+                dev->x_old = dev->y_old = -1;
+                memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
 
-                dev->size_detect_done = 1;
                 goto exit;
         }
 
@@ -514,28 +634,26 @@ static void atp_complete(struct urb *urb)
         input_sync(dev->input);
 
         /*
-         * Many Geysers will continue to send packets continually after
+         * Geysers 3/4 will continue to send packets continually after
          * the first touch unless reinitialised. Do so if it's been
          * idle for a while in order to avoid waking the kernel up
-         * several hundred times a second. Re-initialization does not
-         * work on Fountain touchpads.
+         * several hundred times a second.
          */
-        if (dev->type != ATP_FOUNTAIN) {
-                /*
-                 * Button must not be pressed when entering suspend,
-                 * otherwise we will never release the button.
-                 */
-                if (!x && !y && !key) {
-                        dev->idlecount++;
-                        if (dev->idlecount == 10) {
-                                dev->valid = false;
-                                schedule_work(&dev->work);
-                                /* Don't resubmit urb here, wait for reinit */
-                                return;
-                        }
-                } else
-                        dev->idlecount = 0;
-        }
+
+        /*
+         * Button must not be pressed when entering suspend,
+         * otherwise we will never release the button.
+         */
+        if (!x && !y && !key) {
+                dev->idlecount++;
+                if (dev->idlecount == 10) {
+                        dev->valid = false;
+                        schedule_work(&dev->work);
+                        /* Don't resubmit urb here, wait for reinit */
+                        return;
+                }
+        } else
+                dev->idlecount = 0;
 
  exit:
         retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
@@ -632,9 +750,19 @@ static int atp_probe(struct usb_interface *iface,
         if (!dev->data)
                 goto err_free_urb;
 
-        usb_fill_int_urb(dev->urb, udev,
-                         usb_rcvintpipe(udev, int_in_endpointAddr),
-                         dev->data, dev->datalen, atp_complete, dev, 1);
+        /* Select the USB complete (callback) function */
+        if (dev->type == ATP_FOUNTAIN ||
+            dev->type == ATP_GEYSER1 ||
+            dev->type == ATP_GEYSER2)
+                usb_fill_int_urb(dev->urb, udev,
+                                 usb_rcvintpipe(udev, int_in_endpointAddr),
+                                 dev->data, dev->datalen,
+                                 atp_complete_geyser_1_2, dev, 1);
+        else
+                usb_fill_int_urb(dev->urb, udev,
+                                 usb_rcvintpipe(udev, int_in_endpointAddr),
+                                 dev->data, dev->datalen,
+                                 atp_complete_geyser_3_4, dev, 1);
 
         error = atp_handle_geyser(dev);
         if (error)