[PATCH] [v1.1 1/3] driver: input :touchscreen : add Raydium crc touch function

jeffrey.lin
2016-07-07T16:39:19Z

add checksum for touch report points.

Signed-off-by: jeffrey.lin <jeffrey.lin@rad-ic.com>
---
drivers/input/touchscreen/raydium_i2c_ts.c | 86 +++++++++++++++++++-----------
1 file changed, 56 insertions(+), 30 deletions(-)

diff --git a/drivers/input/touchscreen/raydium_i2c_ts.c b/drivers/input/touchscreen/raydium_i2c_ts.c
index f3076d9..de31b41 100644
--- a/drivers/input/touchscreen/raydium_i2c_ts.c
+++ b/drivers/input/touchscreen/raydium_i2c_ts.c
@@ -70,6 +70,8 @@
#define RM_CONTACT_WIDTH_X_POS 6
#define RM_CONTACT_WIDTH_Y_POS 7

+#define RM_CONTACT_CRC_OFFSET 2
+
/* Bootloader relative info */
#define RM_BL_WRT_CMD_SIZE 3 /* bl flash wrt cmd size */
#define RM_BL_WRT_PKG_SIZE 32 /* bl wrt pkg size */
@@ -137,6 +139,7 @@ struct raydium_data {
u32 data_bank_addr;
u8 report_size;
u8 contact_size;
+ u8 pkg_size;

enum raydium_boot_mode boot_mode;

@@ -280,12 +283,14 @@ static int raydium_i2c_query_ts_info(struct raydium_data *ts)
* then the size changed (due to firmware update?) and keep
* old size instead.
*/
- if (ts->report_data && ts->report_size != data_info.pkg_size)
+ if (ts->report_data && ts->pkg_size != data_info.pkg_size)
dev_warn(&client->dev,
"report size changes, was: %d, new: %d\n",
- ts->report_size, data_info.pkg_size);
- else
- ts->report_size = data_info.pkg_size;
+ ts->pkg_size, data_info.pkg_size);
+ else {
+ ts->pkg_size = data_info.pkg_size;
+ ts->report_size = ts->pkg_size - RM_CONTACT_CRC_OFFSET;
+ }

ts->contact_size = data_info.tp_info_size;
ts->data_bank_addr = le32_to_cpu(data_info.data_bank_addr);
@@ -612,6 +617,17 @@ static int raydium_i2c_fw_write_page(struct i2c_client *client,
return error;
}

+static u16 raydium_calc_chksum(const u8 *buf, u16 len)
+{
+ u16 checksum = 0;
+ u16 i;
+
+ for (i = 0; i < len; i++)
+ checksum += buf[i];
+
+ return checksum;
+}
+
static int raydium_i2c_do_update_firmware(struct raydium_data *ts,
const struct firmware *fw)
{
@@ -724,9 +740,7 @@ static int raydium_i2c_do_update_firmware(struct raydium_data *ts,
return error;
}

- fw_checksum = 0;
- for (i = 0; i < fw->size; i++)
- fw_checksum += fw->data[i];
+ fw_checksum = raydium_calc_chksum(fw->data, fw->size);

error = raydium_i2c_write_checksum(client, fw->size, fw_checksum);
if (error)
@@ -780,15 +794,6 @@ out_enable_irq:
static void raydium_mt_event(struct raydium_data *ts)
{
int i;
- int error;
-
- error = raydium_i2c_read_message(ts->client, ts->data_bank_addr,
- ts->report_data, ts->report_size);
- if (error) {
- dev_err(&ts->client->dev, "%s: failed to read data: %d\n",
- __func__, error);
- return;
- }

for (i = 0; i < ts->report_size / ts->contact_size; i++) {
u8 *contact = &ts->report_data[ts->contact_size * i];
@@ -798,33 +803,54 @@ static void raydium_mt_event(struct raydium_data *ts)
input_mt_slot(ts->input, i);
input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, state);

- if (!state)
- continue;
-
- input_report_abs(ts->input, ABS_MT_POSITION_X,
+ if (state == 0x01) {
+ input_report_abs(ts->input, ABS_MT_POSITION_X,
get_unaligned_le16(&contact[RM_CONTACT_X_POS]));
- input_report_abs(ts->input, ABS_MT_POSITION_Y,
+ input_report_abs(ts->input, ABS_MT_POSITION_Y,
get_unaligned_le16(&contact[RM_CONTACT_Y_POS]));
- input_report_abs(ts->input, ABS_MT_PRESSURE,
- contact[RM_CONTACT_PRESSURE_POS]);
+ input_report_abs(ts->input, ABS_MT_PRESSURE,
+ contact[RM_CONTACT_PRESSURE_POS]);

- wx = contact[RM_CONTACT_WIDTH_X_POS];
- wy = contact[RM_CONTACT_WIDTH_Y_POS];
+ wx = contact[RM_CONTACT_WIDTH_X_POS];
+ wy = contact[RM_CONTACT_WIDTH_Y_POS];

- input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, max(wx, wy));
- input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, min(wx, wy));
+ input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
+ max(wx, wy));
+ input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
+ min(wx, wy));
+ }
}

input_mt_sync_frame(ts->input);
input_sync(ts->input);
}

+static void raydium_i2c_event(struct raydium_data *ts)
+{
+ u16 fw_crc;
+ u16 calc_crc = raydium_calc_chksum(ts->report_data, ts->report_size);
+
+ fw_crc = get_unaligned_le16(&ts->report_data[ts->report_size]);
+
+ if (unlikely(fw_crc != calc_crc))
+ dev_warn(&ts->client->dev,
+ "%s: invalid packet crc %04x &. %04x\n",
+ __func__, calc_crc, fw_crc);
+ else
+ raydium_mt_event(ts);
+}
+
static irqreturn_t raydium_i2c_irq(int irq, void *_dev)
{
struct raydium_data *ts = _dev;
+ int error;

- if (ts->boot_mode != RAYDIUM_TS_BLDR)
- raydium_mt_event(ts);
+ if (ts->boot_mode == RAYDIUM_TS_MAIN) {
+ error = raydium_i2c_read_message(ts->client, ts->data_bank_addr,
+ ts->report_data, ts->pkg_size);
+ if (!error)
+ raydium_i2c_event(ts);
+ }

return IRQ_HANDLED;
}
@@ -1050,7 +1076,7 @@ static int raydium_i2c_probe(struct i2c_client *client,
}

ts->report_data = devm_kmalloc(&client->dev,
- ts->report_size, GFP_KERNEL);
+ ts->pkg_size, GFP_KERNEL);
if (!ts->report_data)
return -ENOMEM;

--
2.1.2