[media] Input: atmel_mxt_ts - read touchscreen size

The touchscreen may have a margin where not all the matrix is used. Read
the parameters from T9 and T100 and take account of the difference.

Note: this does not read the XORIGIN/YORIGIN fields so it assumes that
the touchscreen starts at (0,0)

Signed-off-by: Nick Dyer <nick@shmanahar.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 36 insertions, 6 deletions

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index a9f987b59f9a..29be261a4750 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -103,6 +103,8 @@ struct t7_config {
 
 /* MXT_TOUCH_MULTI_T9 field */
 #define MXT_T9_CTRL             0
+#define MXT_T9_XSIZE            3
+#define MXT_T9_YSIZE            4
 #define MXT_T9_ORIENT           9
 #define MXT_T9_RANGE            18
 
@@ -150,7 +152,9 @@ struct t37_debug {
 #define MXT_T100_CTRL           0
 #define MXT_T100_CFG1           1
 #define MXT_T100_TCHAUX         3
+#define MXT_T100_XSIZE          9
 #define MXT_T100_XRANGE         13
+#define MXT_T100_YSIZE          20
 #define MXT_T100_YRANGE         24
 
 #define MXT_T100_CFG_SWITCHXY   BIT(5)
@@ -259,6 +263,8 @@ struct mxt_data {
         unsigned int max_x;
         unsigned int max_y;
         bool xy_switch;
+        u8 xsize;
+        u8 ysize;
         bool in_bootloader;
         u16 mem_size;
         u8 t100_aux_ampl;
@@ -1714,6 +1720,18 @@ static int mxt_read_t9_resolution(struct mxt_data *data)
                 return -EINVAL;
 
         error = __mxt_read_reg(client,
+                               object->start_address + MXT_T9_XSIZE,
+                               sizeof(data->xsize), &data->xsize);
+        if (error)
+                return error;
+
+        error = __mxt_read_reg(client,
+                               object->start_address + MXT_T9_YSIZE,
+                               sizeof(data->ysize), &data->ysize);
+        if (error)
+                return error;
+
+        error = __mxt_read_reg(client,
                                object->start_address + MXT_T9_RANGE,
                                sizeof(range), &range);
         if (error)
@@ -1763,6 +1781,18 @@ static int mxt_read_t100_config(struct mxt_data *data)
 
         data->max_y = get_unaligned_le16(&range_y);
 
+        error = __mxt_read_reg(client,
+                               object->start_address + MXT_T100_XSIZE,
+                               sizeof(data->xsize), &data->xsize);
+        if (error)
+                return error;
+
+        error = __mxt_read_reg(client,
+                               object->start_address + MXT_T100_YSIZE,
+                               sizeof(data->ysize), &data->ysize);
+        if (error)
+                return error;
+
         /* read orientation config */
         error =  __mxt_read_reg(client,
                                 object->start_address + MXT_T100_CFG1,
@@ -2121,7 +2151,7 @@ static int mxt_convert_debug_pages(struct mxt_data *data, u16 *outbuf)
                 outbuf[i] = mxt_get_debug_value(data, x, y);
 
                 /* Next value */
-                if (++x >= data->info.matrix_xsize) {
+                if (++x >= data->xsize) {
                         x = 0;
                         y++;
                 }
@@ -2276,8 +2306,8 @@ static int mxt_set_input(struct mxt_data *data, unsigned int i)
         if (i > 0)
                 return -EINVAL;
 
-        f->width = data->info.matrix_xsize;
-        f->height = data->info.matrix_ysize;
+        f->width = data->xsize;
+        f->height = data->ysize;
         f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
         f->field = V4L2_FIELD_NONE;
         f->colorspace = V4L2_COLORSPACE_RAW;
@@ -2392,9 +2422,9 @@ static void mxt_debug_init(struct mxt_data *data)
         dbg->t37_address = object->start_address;
 
         /* Calculate size of data and allocate buffer */
-        dbg->t37_nodes = data->info.matrix_xsize * data->info.matrix_ysize;
-        dbg->t37_pages = DIV_ROUND_UP(dbg->t37_nodes * sizeof(u16),
-                                      sizeof(dbg->t37_buf->data));
+        dbg->t37_nodes = data->xsize * data->ysize;
+        dbg->t37_pages = DIV_ROUND_UP(data->xsize * data->info.matrix_ysize *
+                                      sizeof(u16), sizeof(dbg->t37_buf->data));
 
         dbg->t37_buf = devm_kmalloc_array(&data->client->dev, dbg->t37_pages,
                                           sizeof(struct t37_debug), GFP_KERNEL);