Input: edt-ft5x06 - implement support for the EDT-M12 series

This adds support for the EDT M12 series of touchscreens.

Signed-off-by: Simon Budig <simon.budig@kernelconcepts.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 56bfd0c..c53a3d7 100644 (file)
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -72,6 +72,7 @@
 enum edt_ver {
        EDT_M06,
        EDT_M09,
+       EDT_M12,
        GENERIC_FT,
 };
 
@@ -188,6 +189,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
                break;
 
        case EDT_M09:
+       case EDT_M12:
        case GENERIC_FT:
                cmd = 0x0;
                offset = 3;
@@ -211,7 +213,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
                goto out;
        }
 
-       /* M09 does not send header or CRC */
+       /* M09/M12 does not send header or CRC */
        if (tsdata->version == EDT_M06) {
                if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
                        rdbuf[2] != datalen) {
@@ -274,6 +276,7 @@ static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
                return edt_ft5x06_ts_readwrite(tsdata->client, 4,
                                        wrbuf, 0, NULL);
        case EDT_M09:
+       case EDT_M12:
        case GENERIC_FT:
                wrbuf[0] = addr;
                wrbuf[1] = value;
@@ -313,6 +316,7 @@ static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
                break;
 
        case EDT_M09:
+       case EDT_M12:
        case GENERIC_FT:
                wrbuf[0] = addr;
                error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
@@ -377,6 +381,7 @@ static ssize_t edt_ft5x06_setting_show(struct device *dev,
                break;
 
        case EDT_M09:
+       case EDT_M12:
        case GENERIC_FT:
                addr = attr->addr_m09;
                break;
@@ -447,6 +452,7 @@ static ssize_t edt_ft5x06_setting_store(struct device *dev,
                break;
 
        case EDT_M09:
+       case EDT_M12:
        case GENERIC_FT:
                addr = attr->addr_m09;
                break;
@@ -472,14 +478,18 @@ out:
        return error ?: count;
 }
 
+/* m06, m09: range 0-31, m12: range 0-5 */
 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
                M09_REGISTER_GAIN, 0, 31);
+/* m06, m09: range 0-31, m12: range 0-16 */
 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
                M09_REGISTER_OFFSET, 0, 31);
+/* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */
 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
-               M09_REGISTER_THRESHOLD, 0, 80);
+               M09_REGISTER_THRESHOLD, 0, 255);
+/* m06: range 3 to 14, m12: (0x64: 100Hz) */
 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
-               NO_REGISTER, 3, 14);
+               NO_REGISTER, 0, 255);
 
 static struct attribute *edt_ft5x06_attrs[] = {
        &edt_ft5x06_attr_gain.dattr.attr,
@@ -551,7 +561,7 @@ err_out:
        return error;
 
 m09_out:
-       dev_err(&client->dev, "No factory mode support for M09/GENERIC_FT\n");
+       dev_err(&client->dev, "No factory mode support for M09/M12/GENERIC_FT\n");
        return -EINVAL;
 
 }
@@ -776,15 +786,16 @@ static int edt_ft5x06_ts_identify(struct i2c_client *client,
         * to have garbage in there
         */
        memset(rdbuf, 0, sizeof(rdbuf));
-       error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
+       error = edt_ft5x06_ts_readwrite(client, 1, "\xBB",
                                        EDT_NAME_LEN - 1, rdbuf);
        if (error)
                return error;
 
-       /* if we find something consistent, stay with that assumption
-        * at least M09 won't send 3 bytes here
+       /* Probe content for something consistent.
+        * M06 starts with a response byte, M12 gives the data directly.
+        * M09/Generic does not provide model number information.
         */
-       if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
+       if (!strncasecmp(rdbuf + 1, "EP0", 3)) {
                tsdata->version = EDT_M06;
 
                /* remove last '$' end marker */
@@ -798,8 +809,22 @@ static int edt_ft5x06_ts_identify(struct i2c_client *client,
                        *p++ = '\0';
                strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
                strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
+       } else if (!strncasecmp(rdbuf, "EP0", 3)) {
+               tsdata->version = EDT_M12;
+
+               /* remove last '$' end marker */
+               rdbuf[EDT_NAME_LEN - 2] = '\0';
+               if (rdbuf[EDT_NAME_LEN - 3] == '$')
+                       rdbuf[EDT_NAME_LEN - 3] = '\0';
+
+               /* look for Model/Version separator */
+               p = strchr(rdbuf, '*');
+               if (p)
+                       *p++ = '\0';
+               strlcpy(model_name, rdbuf, EDT_NAME_LEN);
+               strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
        } else {
-               /* If it is not an EDT M06 touchscreen, then the model
+               /* If it is not an EDT M06/M12 touchscreen, then the model
                 * detection is a bit hairy. The different ft5x06
                 * firmares around don't reliably implement the
                 * identification registers. Well, we'll take a shot.
@@ -894,7 +919,8 @@ edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
                tsdata->report_rate = edt_ft5x06_register_read(tsdata,
                                                reg_addr->reg_report_rate);
        if (tsdata->version == EDT_M06 ||
-           tsdata->version == EDT_M09) {
+           tsdata->version == EDT_M09 ||
+           tsdata->version == EDT_M12) {
                tsdata->num_x = edt_ft5x06_register_read(tsdata,
                                                         reg_addr->reg_num_x);
                tsdata->num_y = edt_ft5x06_register_read(tsdata,
@@ -921,6 +947,7 @@ edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
                break;
 
        case EDT_M09:
+       case EDT_M12:
                reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
                reg_addr->reg_report_rate = NO_REGISTER;
                reg_addr->reg_gain = M09_REGISTER_GAIN;
@@ -1025,7 +1052,8 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
        input->dev.parent = &client->dev;
 
        if (tsdata->version == EDT_M06 ||
-           tsdata->version == EDT_M09) {
+           tsdata->version == EDT_M09 ||
+           tsdata->version == EDT_M12) {
                input_set_abs_params(input, ABS_MT_POSITION_X,
                                     0, tsdata->num_x * 64 - 1, 0, 0);
                input_set_abs_params(input, ABS_MT_POSITION_Y,