This patch add Remark ID check flow to firmware update function of elan
touchscreen driver.
It avoids firmware update with mismatched Remark ID.
This function is supported by our latest version of boot code, but it
cooperates well with earlier versions.
Our driver will decide if enable Remark ID check with boot code version.
Signed-off-by: Johnny Chuang <johnny.chuang@xxxxxxxxxx>
---
drivers/input/touchscreen/elants_i2c.c | 108
++++++++++++++++++++++++++++++---
1 file changed, 100 insertions(+), 8 deletions(-)
diff --git a/drivers/input/touchscreen/elants_i2c.c
b/drivers/input/touchscreen/elants_i2c.c
index d4ad24e..9a17af6 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -59,8 +59,10 @@
#define CMD_HEADER_WRITE 0x54
#define CMD_HEADER_READ 0x53
#define CMD_HEADER_6B_READ 0x5B
+#define CMD_HEADER_ROM_READ 0x96
#define CMD_HEADER_RESP 0x52
#define CMD_HEADER_6B_RESP 0x9B
+#define CMD_HEADER_ROM_RESP 0x95
#define CMD_HEADER_HELLO 0x55
#define CMD_HEADER_REK 0x66
@@ -128,6 +130,7 @@ struct elants_data {
u8 bc_version;
u8 iap_version;
u16 hw_version;
+ u16 remark_id;
unsigned int x_res; /* resolution in units/mm */
unsigned int y_res;
unsigned int x_max;
@@ -200,6 +203,10 @@ static int elants_i2c_execute_command(struct i2c_client
*client,
expected_response = CMD_HEADER_6B_RESP;
break;
+ case CMD_HEADER_ROM_READ:
+ expected_response = CMD_HEADER_ROM_RESP;
+ break;
+
default:
dev_err(&client->dev, "%s: invalid command %*ph\n",
__func__, (int)cmd_size, cmd);
@@ -556,6 +563,8 @@ static int elants_i2c_initialize(struct elants_data *ts)
/* hw version is available even if device in recovery state */
error2 = elants_i2c_query_hw_version(ts);
+ if (!error2)
+ error2 = elants_i2c_query_bc_version(ts);
if (!error)
error = error2;
@@ -564,8 +573,6 @@ static int elants_i2c_initialize(struct elants_data *ts)
if (!error)
error = elants_i2c_query_test_version(ts);
if (!error)
- error = elants_i2c_query_bc_version(ts);
- if (!error)
error = elants_i2c_query_ts_info(ts);
if (error)
@@ -613,39 +620,124 @@ static int elants_i2c_fw_write_page(struct i2c_client
*client,
return error;
}
+static int elants_i2c_query_remark_id(struct elants_data *ts) {
+ struct i2c_client *client = ts->client;
+ int error;
+ const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21
};
+ u8 resp[6] = { 0 };
+
+ error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
+ resp, sizeof(resp));
+ if (error) {
+ dev_err(&client->dev, "get Remark ID failed: %d.\n", error);
+ return error;
+ }
+
+ ts->remark_id = get_unaligned_be16(&resp[3]);
+ dev_info(&client->dev, "remark_id=0x%04x.\n", ts->remark_id);
+
+ return 0;
+}
+
+static int elants_i2c_validate_remark_id(struct elants_data *ts,
+ const struct firmware *fw)
+{
+ struct i2c_client *client = ts->client;
+ int error;
+ u16 fw_remark_id = 0;
+
+ /* Compare TS Remark ID and FW Remark ID */
+ error = elants_i2c_query_remark_id(ts);
+ if (error) {
+ dev_err(&client->dev, "failed to query Remark ID: %d\n",
error);
+ return error;
+ }
+
+ fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]);
+ dev_info(&client->dev, "fw_remark_id=0x%04x.\n", fw_remark_id);
+ if (fw_remark_id != ts->remark_id) {
+ dev_err(&client->dev,
+ "Remark ID Mismatched: ts_remark_id=0x%04x,
fw_remark_id=0x%x.\n",
+ ts->remark_id, fw_remark_id);
+ return -ENODATA;
+ }
+
+ return 0;
+}
+
static int elants_i2c_do_update_firmware(struct i2c_client *client,
const struct firmware *fw,
bool force)
{
+ struct elants_data *ts = i2c_get_clientdata(client);
+ static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 };
const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 };
const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc };
- const u8 close_idle[] = {0x54, 0x2c, 0x01, 0x01};
+ const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 };
u8 buf[HEADER_SIZE];
u16 send_id;
int page, n_fw_pages;
int error;
+ bool check_remark_id = ts->iap_version >= 0x60;
/* Recovery mode detection! */
if (force) {
dev_dbg(&client->dev, "Recovery mode procedure\n");
+
+ if (check_remark_id == true) {
+ /* Validate Remark ID */
+ error = elants_i2c_validate_remark_id(ts, fw);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to validate Remark ID:
%d\n",
+ error);
+ return error;
+ }
+ }
+
+ error = elants_i2c_send(client, w_flashkey,
sizeof(w_flashkey));
+ if (error)
+ dev_err(&client->dev, "failed to write flash key:
%d\n",
+ error);
+
error = elants_i2c_send(client, enter_iap2,
sizeof(enter_iap2));
+ if (error) {
+ dev_err(&client->dev, "failed to enter IAP mode:
%d\n",
+ error);
+ return error;
+ }
+ msleep(20);
} else {
/* Start IAP Procedure */
dev_dbg(&client->dev, "Normal IAP procedure\n");
+
/* Close idle mode */
error = elants_i2c_send(client, close_idle,
sizeof(close_idle));
if (error)
dev_err(&client->dev, "Failed close idle: %d\n",
error);
msleep(60);
+
elants_i2c_sw_reset(client);
msleep(20);
- error = elants_i2c_send(client, enter_iap,
sizeof(enter_iap));
- }
- if (error) {
- dev_err(&client->dev, "failed to enter IAP mode: %d\n",
error);
- return error;
+ if (check_remark_id == true) {
+ /* Validate Remark ID */
+ error = elants_i2c_validate_remark_id(ts, fw);
+ if (error) {
+ dev_err(&client->dev, "failed to validate
Remark ID: %d\n",
+ error);
+ return error;
+ }
+ }
+
+ error = elants_i2c_send(client, enter_iap,
sizeof(enter_iap));
+ if (error) {
+ dev_err(&client->dev, "failed to enter IAP mode:
%d\n",
+ error);
+ return error;
+ }
}
msleep(20);
--
2.7.4
