[PATCH RFC 3/8] Input: atmel_mxt_ts - read touchscreen position in matrix

Nick Dyer
2015-12-02T20:51:22Z

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.

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 41 ++++++++++++++++++++++++++++----
1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index a96fec4..9bc42f4 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -100,6 +100,8 @@ 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

@@ -145,7 +147,9 @@ 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)
@@ -243,6 +247,8 @@ 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;
@@ -1688,6 +1694,18 @@ 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)
@@ -1737,6 +1755,18 @@ 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,
@@ -2077,7 +2107,7 @@ static u16 mxt_get_debug_value(struct mxt_data *data, unsigned int x,
struct mxt_dbg *dbg = &data->dbg;
unsigned int ofs, page;

- ofs = (y + (x * (data->info.matrix_ysize))) * sizeof(u16);
+ ofs = (y + (x * data->info.matrix_ysize)) * sizeof(u16);
page = ofs / MXT_DIAGNOSTIC_SIZE;
ofs %= MXT_DIAGNOSTIC_SIZE;

@@ -2095,7 +2125,7 @@ static void mxt_convert_debug_pages(struct mxt_data *data)
dbg->debug_buf[i] = mxt_get_debug_value(data, x, y);

/* Next value */
- if (++x >= data->info.matrix_xsize) {
+ if (++x >= data->xsize) {
x = 0;
y++;
}
@@ -2213,9 +2243,10 @@ static void mxt_debugfs_init(struct mxt_data *data)
}

/* Calculate size of data and allocate buffer */
- dbg->t37_nodes = data->info.matrix_xsize * data->info.matrix_ysize;
- dbg->t37_pages = dbg->t37_nodes * sizeof(u16)
- / sizeof(dbg->t37_buf->data) + 1;
+ dbg->t37_nodes = data->xsize * data->ysize;
+ dbg->t37_pages = ((data->xsize * data->info.matrix_ysize)
+ * sizeof(u16) / sizeof(dbg->t37_buf->data)) + 1;
+
dbg->debug_buf = devm_kzalloc(&data->client->dev,
dbg->t37_nodes * sizeof(u16),
GFP_KERNEL);
--
2.5.0