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path: root/drivers/input/touchscreen/elants_i2c.c
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Diffstat (limited to 'drivers/input/touchscreen/elants_i2c.c')
-rw-r--r--drivers/input/touchscreen/elants_i2c.c151
1 files changed, 134 insertions, 17 deletions
diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index d51cb910fba1..4c2b579f6c8b 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -56,6 +56,7 @@
#define QUEUE_HEADER_SINGLE 0x62
#define QUEUE_HEADER_NORMAL 0X63
#define QUEUE_HEADER_WAIT 0x64
+#define QUEUE_HEADER_NORMAL2 0x66
/* Command header definition */
#define CMD_HEADER_WRITE 0x54
@@ -69,6 +70,7 @@
#define CMD_HEADER_REK 0x66
/* FW position data */
+#define PACKET_SIZE_OLD 40
#define PACKET_SIZE 55
#define MAX_CONTACT_NUM 10
#define FW_POS_HEADER 0
@@ -90,6 +92,8 @@
/* FW read command, 0x53 0x?? 0x0, 0x01 */
#define E_ELAN_INFO_FW_VER 0x00
#define E_ELAN_INFO_BC_VER 0x10
+#define E_ELAN_INFO_X_RES 0x60
+#define E_ELAN_INFO_Y_RES 0x63
#define E_ELAN_INFO_REK 0xD0
#define E_ELAN_INFO_TEST_VER 0xE0
#define E_ELAN_INFO_FW_ID 0xF0
@@ -112,6 +116,11 @@
#define ELAN_POWERON_DELAY_USEC 500
#define ELAN_RESET_DELAY_MSEC 20
+enum elants_chip_id {
+ EKTH3500,
+ EKTF3624,
+};
+
enum elants_state {
ELAN_STATE_NORMAL,
ELAN_WAIT_QUEUE_HEADER,
@@ -143,9 +152,12 @@ struct elants_data {
unsigned int y_res;
unsigned int x_max;
unsigned int y_max;
+ unsigned int phy_x;
+ unsigned int phy_y;
struct touchscreen_properties prop;
enum elants_state state;
+ enum elants_chip_id chip_id;
enum elants_iap_mode iap_mode;
/* Guards against concurrent access to the device via sysfs */
@@ -433,7 +445,51 @@ static int elants_i2c_query_bc_version(struct elants_data *ts)
return 0;
}
-static int elants_i2c_query_ts_info(struct elants_data *ts)
+static int elants_i2c_query_ts_info_ektf(struct elants_data *ts)
+{
+ struct i2c_client *client = ts->client;
+ int error;
+ u8 resp[4];
+ u16 phy_x, phy_y;
+ const u8 get_xres_cmd[] = {
+ CMD_HEADER_READ, E_ELAN_INFO_X_RES, 0x00, 0x00
+ };
+ const u8 get_yres_cmd[] = {
+ CMD_HEADER_READ, E_ELAN_INFO_Y_RES, 0x00, 0x00
+ };
+
+ /* Get X/Y size in mm */
+ error = elants_i2c_execute_command(client, get_xres_cmd,
+ sizeof(get_xres_cmd),
+ resp, sizeof(resp), 1,
+ "get X size");
+ if (error)
+ return error;
+
+ phy_x = resp[2] | ((resp[3] & 0xF0) << 4);
+
+ error = elants_i2c_execute_command(client, get_yres_cmd,
+ sizeof(get_yres_cmd),
+ resp, sizeof(resp), 1,
+ "get Y size");
+ if (error)
+ return error;
+
+ phy_y = resp[2] | ((resp[3] & 0xF0) << 4);
+
+ dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
+
+ ts->phy_x = phy_x;
+ ts->phy_y = phy_y;
+
+ /* eKTF doesn't report max size, set it to default values */
+ ts->x_max = 2240 - 1;
+ ts->y_max = 1408 - 1;
+
+ return 0;
+}
+
+static int elants_i2c_query_ts_info_ekth(struct elants_data *ts)
{
struct i2c_client *client = ts->client;
int error;
@@ -508,6 +564,8 @@ static int elants_i2c_query_ts_info(struct elants_data *ts)
ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x);
ts->y_max = ELAN_TS_RESOLUTION(cols, osr);
ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y);
+ ts->phy_x = phy_x;
+ ts->phy_y = phy_y;
}
return 0;
@@ -587,8 +645,19 @@ static int elants_i2c_initialize(struct elants_data *ts)
error = elants_i2c_query_fw_version(ts);
if (!error)
error = elants_i2c_query_test_version(ts);
- if (!error)
- error = elants_i2c_query_ts_info(ts);
+
+ switch (ts->chip_id) {
+ case EKTH3500:
+ if (!error)
+ error = elants_i2c_query_ts_info_ekth(ts);
+ break;
+ case EKTF3624:
+ if (!error)
+ error = elants_i2c_query_ts_info_ektf(ts);
+ break;
+ default:
+ BUG();
+ }
if (error)
ts->iap_mode = ELAN_IAP_RECOVERY;
@@ -853,7 +922,8 @@ out:
* Event reporting.
*/
-static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
+static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf,
+ size_t packet_size)
{
struct input_dev *input = ts->input;
unsigned int n_fingers;
@@ -880,8 +950,24 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
pos = &buf[FW_POS_XY + i * 3];
x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
- p = buf[FW_POS_PRESSURE + i];
- w = buf[FW_POS_WIDTH + i];
+
+ /*
+ * eKTF3624 may have use "old" touch-report format,
+ * depending on a device and TS firmware version.
+ * For example, ASUS Transformer devices use the "old"
+ * format, while ASUS Nexus 7 uses the "new" formant.
+ */
+ if (packet_size == PACKET_SIZE_OLD &&
+ ts->chip_id == EKTF3624) {
+ w = buf[FW_POS_WIDTH + i / 2];
+ w >>= 4 * (~i & 1);
+ w |= w << 4;
+ w |= !w;
+ p = w;
+ } else {
+ p = buf[FW_POS_PRESSURE + i];
+ w = buf[FW_POS_WIDTH + i];
+ }
dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
i, x, y, p, w);
@@ -913,7 +999,8 @@ static u8 elants_i2c_calculate_checksum(u8 *buf)
return checksum;
}
-static void elants_i2c_event(struct elants_data *ts, u8 *buf)
+static void elants_i2c_event(struct elants_data *ts, u8 *buf,
+ size_t packet_size)
{
u8 checksum = elants_i2c_calculate_checksum(buf);
@@ -927,7 +1014,7 @@ static void elants_i2c_event(struct elants_data *ts, u8 *buf)
"%s: unknown packet type: %02x\n",
__func__, buf[FW_POS_HEADER]);
else
- elants_i2c_mt_event(ts, buf);
+ elants_i2c_mt_event(ts, buf, packet_size);
}
static irqreturn_t elants_i2c_irq(int irq, void *_dev)
@@ -970,7 +1057,6 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
switch (ts->buf[FW_HDR_TYPE]) {
case CMD_HEADER_HELLO:
case CMD_HEADER_RESP:
- case CMD_HEADER_REK:
break;
case QUEUE_HEADER_WAIT:
@@ -985,9 +1071,24 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
break;
case QUEUE_HEADER_SINGLE:
- elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
+ elants_i2c_event(ts, &ts->buf[HEADER_SIZE],
+ ts->buf[FW_HDR_LENGTH]);
break;
+ case QUEUE_HEADER_NORMAL2: /* CMD_HEADER_REK */
+ /*
+ * Depending on firmware version, eKTF3624 touchscreens
+ * may utilize one of these opcodes for the touch events:
+ * 0x63 (NORMAL) and 0x66 (NORMAL2). The 0x63 is used by
+ * older firmware version and differs from 0x66 such that
+ * touch pressure value needs to be adjusted. The 0x66
+ * opcode of newer firmware is equal to 0x63 of eKTH3500.
+ */
+ if (ts->chip_id != EKTF3624)
+ break;
+
+ fallthrough;
+
case QUEUE_HEADER_NORMAL:
report_count = ts->buf[FW_HDR_COUNT];
if (report_count == 0 || report_count > 3) {
@@ -998,7 +1099,12 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
}
report_len = ts->buf[FW_HDR_LENGTH] / report_count;
- if (report_len != PACKET_SIZE) {
+
+ if (report_len == PACKET_SIZE_OLD &&
+ ts->chip_id == EKTF3624) {
+ dev_dbg_once(&client->dev,
+ "using old report format\n");
+ } else if (report_len != PACKET_SIZE) {
dev_err(&client->dev,
"mismatching report length: %*ph\n",
HEADER_SIZE, ts->buf);
@@ -1007,8 +1113,8 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
for (i = 0; i < report_count; i++) {
u8 *buf = ts->buf + HEADER_SIZE +
- i * PACKET_SIZE;
- elants_i2c_event(ts, buf);
+ i * report_len;
+ elants_i2c_event(ts, buf, report_len);
}
break;
@@ -1250,6 +1356,7 @@ static int elants_i2c_probe(struct i2c_client *client,
init_completion(&ts->cmd_done);
ts->client = client;
+ ts->chip_id = (enum elants_chip_id)id->driver_data;
i2c_set_clientdata(client, ts);
ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
@@ -1331,13 +1438,20 @@ static int elants_i2c_probe(struct i2c_client *client,
input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE,
0, MT_TOOL_PALM, 0, 0);
+
+ touchscreen_parse_properties(ts->input, true, &ts->prop);
+
+ if (ts->chip_id == EKTF3624) {
+ /* calculate resolution from size */
+ ts->x_res = DIV_ROUND_CLOSEST(ts->prop.max_x, ts->phy_x);
+ ts->y_res = DIV_ROUND_CLOSEST(ts->prop.max_y, ts->phy_y);
+ }
+
input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res);
input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
if (ts->major_res > 0)
input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, ts->major_res);
- touchscreen_parse_properties(ts->input, true, &ts->prop);
-
error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
if (error) {
@@ -1466,14 +1580,16 @@ static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops,
elants_i2c_suspend, elants_i2c_resume);
static const struct i2c_device_id elants_i2c_id[] = {
- { DEVICE_NAME, 0 },
+ { DEVICE_NAME, EKTH3500 },
+ { "ekth3500", EKTH3500 },
+ { "ektf3624", EKTF3624 },
{ }
};
MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
#ifdef CONFIG_ACPI
static const struct acpi_device_id elants_acpi_id[] = {
- { "ELAN0001", 0 },
+ { "ELAN0001", EKTH3500 },
{ }
};
MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
@@ -1482,6 +1598,7 @@ MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
#ifdef CONFIG_OF
static const struct of_device_id elants_of_match[] = {
{ .compatible = "elan,ekth3500" },
+ { .compatible = "elan,ektf3624" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, elants_of_match);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.