[PATCH v11 10/56] Input: atmel_mxt_ts - implement support for T107 active stylus

Jiada Wang
2020-05-08T05:57:45Z

From: Nick Dyer <nick.dyer@itdev.co.uk>

This patch implements support for T107 active stylus

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
(cherry picked from ndyer/linux/for-upstream commit 20e357dd9acf8c2040068c8b22d6bc1401a1893f)
[gdavis: Forward port and fix conflicts due to applying upstream commit
96a938aa214e ("Input: atmel_mxt_ts - remove platform data
support").]
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 117 ++++++++++++++++++++++-
1 file changed, 113 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index ba58cdd5b76d..63db8b66eb67 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -72,6 +72,7 @@
#define MXT_SPT_CTECONFIG_T46 46
#define MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71 71
#define MXT_TOUCH_MULTITOUCHSCREEN_T100 100
+#define MXT_PROCI_ACTIVESTYLUS_T107 107

/* MXT_GEN_MESSAGE_T5 object */
#define MXT_RPTID_NOMSG 0xff
@@ -181,6 +182,7 @@ struct t37_debug {
enum t100_type {
MXT_T100_TYPE_FINGER = 1,
MXT_T100_TYPE_PASSIVE_STYLUS = 2,
+ MXT_T100_TYPE_ACTIVE_STYLUS = 3,
MXT_T100_TYPE_HOVERING_FINGER = 4,
MXT_T100_TYPE_GLOVE = 5,
MXT_T100_TYPE_LARGE_TOUCH = 6,
@@ -192,6 +194,16 @@ enum t100_type {
#define MXT_TOUCH_MAJOR_DEFAULT 1
#define MXT_PRESSURE_DEFAULT 1

+/* Gen2 Active Stylus */
+#define MXT_T107_STYLUS_STYAUX 42
+#define MXT_T107_STYLUS_STYAUX_PRESSURE BIT(0)
+#define MXT_T107_STYLUS_STYAUX_PEAK BIT(4)
+
+#define MXT_T107_STYLUS_HOVER BIT(0)
+#define MXT_T107_STYLUS_TIPSWITCH BIT(1)
+#define MXT_T107_STYLUS_BUTTON0 BIT(2)
+#define MXT_T107_STYLUS_BUTTON1 BIT(3)
+
/* Delay times */
#define MXT_BACKUP_TIME 50 /* msec */
#define MXT_RESET_GPIO_TIME 20 /* msec */
@@ -313,10 +325,12 @@ struct mxt_data {
struct t7_config t7_cfg;
struct mxt_dbg dbg;
struct gpio_desc *reset_gpio;
- bool use_retrigen_workaround;
unsigned long t15_keystatus;
int t15_num_keys;
const unsigned int *t15_keymap;
+ u8 stylus_aux_pressure;
+ u8 stylus_aux_peak;
+ bool use_retrigen_workaround;

/* Cached parameters from object table */
u16 T5_address;
@@ -337,6 +351,7 @@ struct mxt_data {
u8 T48_reportid;
u8 T100_reportid_min;
u8 T100_reportid_max;
+ u16 T107_address;

/* for fw update in bootloader */
struct completion bl_completion;
@@ -908,6 +923,8 @@ static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
u8 major = 0;
u8 pressure = 0;
u8 orientation = 0;
+ bool active = false;
+ bool hover = false;

id = message[0] - data->T100_reportid_min - 2;

@@ -926,6 +943,8 @@ static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
case MXT_T100_TYPE_HOVERING_FINGER:
tool = MT_TOOL_FINGER;
distance = MXT_DISTANCE_HOVERING;
+ hover = true;
+ active = true;

if (data->t100_aux_vect)
orientation = message[data->t100_aux_vect];
@@ -936,6 +955,8 @@ static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
case MXT_T100_TYPE_GLOVE:
tool = MT_TOOL_FINGER;
distance = MXT_DISTANCE_ACTIVE_TOUCH;
+ hover = false;
+ active = true;

if (data->t100_aux_area)
major = message[data->t100_aux_area];
@@ -950,6 +971,9 @@ static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)

case MXT_T100_TYPE_PASSIVE_STYLUS:
tool = MT_TOOL_PEN;
+ distance = MXT_DISTANCE_ACTIVE_TOUCH;
+ hover = false;
+ active = true;

/*
* Passive stylus is reported with size zero so
@@ -962,6 +986,31 @@ static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)

break;

+ case MXT_T100_TYPE_ACTIVE_STYLUS:
+ /* Report input buttons */
+ input_report_key(input_dev, BTN_STYLUS,
+ message[6] & MXT_T107_STYLUS_BUTTON0);
+ input_report_key(input_dev, BTN_STYLUS2,
+ message[6] & MXT_T107_STYLUS_BUTTON1);
+
+ /* stylus in range, but position unavailable */
+ if (!(message[6] & MXT_T107_STYLUS_HOVER))
+ break;
+
+ tool = MT_TOOL_PEN;
+ distance = MXT_DISTANCE_ACTIVE_TOUCH;
+ active = true;
+ major = MXT_TOUCH_MAJOR_DEFAULT;
+
+ if (!(message[6] & MXT_T107_STYLUS_TIPSWITCH)) {
+ hover = true;
+ distance = MXT_DISTANCE_HOVERING;
+ } else if (data->stylus_aux_pressure) {
+ pressure = message[data->stylus_aux_pressure];
+ }
+
+ break;
+
case MXT_T100_TYPE_LARGE_TOUCH:
/* Ignore suppressed touch */
break;
@@ -976,12 +1025,12 @@ static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
* Values reported should be non-zero if tool is touching the
* device
*/
- if (!pressure && type != MXT_T100_TYPE_HOVERING_FINGER)
+ if (!pressure && !hover)
pressure = MXT_PRESSURE_DEFAULT;

input_mt_slot(input_dev, id);

- if (status & MXT_T100_DETECT) {
+ if (active) {
dev_dbg(dev, "[%u] type:%u x:%u y:%u a:%02X p:%02X v:%02X\n",
id, type, x, y, major, pressure, orientation);

@@ -992,6 +1041,7 @@ static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
input_report_abs(input_dev, ABS_MT_PRESSURE, pressure);
input_report_abs(input_dev, ABS_MT_DISTANCE, distance);
input_report_abs(input_dev, ABS_MT_ORIENTATION, orientation);
+
} else {
dev_dbg(dev, "[%u] release\n", id);

@@ -1863,6 +1913,9 @@ static int mxt_parse_object_table(struct mxt_data *data,
/* first two report IDs reserved */
data->num_touchids = object->num_report_ids - 2;
break;
+ case MXT_PROCI_ACTIVESTYLUS_T107:
+ data->T107_address = object->start_address;
+ break;
}

end_address = object->start_address
@@ -2023,6 +2076,54 @@ static int mxt_read_t9_resolution(struct mxt_data *data)
return 0;
}

+static int mxt_set_up_active_stylus(struct input_dev *input_dev,
+ struct mxt_data *data)
+{
+ struct i2c_client *client = data->client;
+ int error;
+ struct mxt_object *object;
+ u8 styaux;
+ int aux;
+ u8 ctrl;
+
+ object = mxt_get_object(data, MXT_PROCI_ACTIVESTYLUS_T107);
+ if (!object)
+ return 0;
+
+ error = __mxt_read_reg(client, object->start_address, 1, &ctrl);
+ if (error)
+ return error;
+
+ /* Check enable bit */
+ if (!(ctrl & 0x01))
+ return 0;
+
+ error = __mxt_read_reg(client,
+ object->start_address + MXT_T107_STYLUS_STYAUX,
+ 1, &styaux);
+ if (error)
+ return error;
+
+ /* map aux bits */
+ aux = 7;
+
+ if (styaux & MXT_T107_STYLUS_STYAUX_PRESSURE)
+ data->stylus_aux_pressure = aux++;
+
+ if (styaux & MXT_T107_STYLUS_STYAUX_PEAK)
+ data->stylus_aux_peak = aux++;
+
+ input_set_capability(input_dev, EV_KEY, BTN_STYLUS);
+ input_set_capability(input_dev, EV_KEY, BTN_STYLUS2);
+ input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE, 0, MT_TOOL_MAX, 0, 0);
+
+ dev_dbg(&client->dev,
+ "T107 active stylus, aux map pressure:%u peak:%u\n",
+ data->stylus_aux_pressure, data->stylus_aux_peak);
+
+ return 0;
+}
+
static int mxt_read_t100_config(struct mxt_data *data)
{
struct i2c_client *client = data->client;
@@ -2229,7 +2330,7 @@ static int mxt_initialize_input_device(struct mxt_data *data)

if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
- data->t100_aux_ampl)) {
+ (data->t100_aux_ampl || data->stylus_aux_pressure))) {
input_set_abs_params(input_dev, ABS_MT_PRESSURE,
0, 255, 0, 0);
}
@@ -2247,6 +2348,14 @@ static int mxt_initialize_input_device(struct mxt_data *data)
0, 255, 0, 0);
}

+ /* For T107 Active Stylus */
+ if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
+ data->T107_address) {
+ error = mxt_set_up_active_stylus(input_dev, data);
+ if (error)
+ dev_warn(dev, "Failed to read T107 config\n");
+ }
+
/* For T15 Key Array */
if (data->T15_reportid_min) {
data->t15_keystatus = 0;
--
2.17.1