Input: edt-ft5x06 - make distinction between m06/m09/generic more clear

Since the driver also is useful for some non-EDT touchscreens based on
the focaltec chips introduce the concept of a "generic" focaltec based
touch.

Use a better heuristics for model detection and be more specific in the
source.

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

1 files changed, 93 insertions, 29 deletions

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index f879d14f7ffc..56bfd0c14c91 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -70,8 +70,9 @@
 #define EDT_RAW_DATA_DELAY              1000 /* usec */
 
 enum edt_ver {
-        M06,
-        M09,
+        EDT_M06,
+        EDT_M09,
+        GENERIC_FT,
 };
 
 struct edt_reg_addr {
@@ -179,14 +180,15 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
         int error;
 
         switch (tsdata->version) {
-        case M06:
+        case EDT_M06:
                 cmd = 0xf9; /* tell the controller to send touch data */
                 offset = 5; /* where the actual touch data starts */
                 tplen = 4;  /* data comes in so called frames */
                 crclen = 1; /* length of the crc data */
                 break;
 
-        case M09:
+        case EDT_M09:
+        case GENERIC_FT:
                 cmd = 0x0;
                 offset = 3;
                 tplen = 6;
@@ -210,7 +212,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
         }
 
         /* M09 does not send header or CRC */
-        if (tsdata->version == M06) {
+        if (tsdata->version == EDT_M06) {
                 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
                         rdbuf[2] != datalen) {
                         dev_err_ratelimited(dev,
@@ -233,7 +235,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
                         continue;
 
                 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
-                if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
+                if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
                         continue;
 
                 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
@@ -264,14 +266,15 @@ static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
         u8 wrbuf[4];
 
         switch (tsdata->version) {
-        case M06:
+        case EDT_M06:
                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
                 wrbuf[2] = value;
                 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
                 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
                                         wrbuf, 0, NULL);
-        case M09:
+        case EDT_M09:
+        case GENERIC_FT:
                 wrbuf[0] = addr;
                 wrbuf[1] = value;
 
@@ -290,7 +293,7 @@ static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
         int error;
 
         switch (tsdata->version) {
-        case M06:
+        case EDT_M06:
                 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
                 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
                 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
@@ -309,7 +312,8 @@ static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
                 }
                 break;
 
-        case M09:
+        case EDT_M09:
+        case GENERIC_FT:
                 wrbuf[0] = addr;
                 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
                                                 wrbuf, 1, rdbuf);
@@ -368,11 +372,12 @@ static ssize_t edt_ft5x06_setting_show(struct device *dev,
         }
 
         switch (tsdata->version) {
-        case M06:
+        case EDT_M06:
                 addr = attr->addr_m06;
                 break;
 
-        case M09:
+        case EDT_M09:
+        case GENERIC_FT:
                 addr = attr->addr_m09;
                 break;
 
@@ -437,11 +442,12 @@ static ssize_t edt_ft5x06_setting_store(struct device *dev,
         }
 
         switch (tsdata->version) {
-        case M06:
+        case EDT_M06:
                 addr = attr->addr_m06;
                 break;
 
-        case M09:
+        case EDT_M09:
+        case GENERIC_FT:
                 addr = attr->addr_m09;
                 break;
 
@@ -508,7 +514,7 @@ static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
         }
 
         /* mode register is 0x3c when in the work mode */
-        if (tsdata->version == M09)
+        if (tsdata->version != EDT_M06)
                 goto m09_out;
 
         error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
@@ -545,7 +551,7 @@ err_out:
         return error;
 
 m09_out:
-        dev_err(&client->dev, "No factory mode support for M09\n");
+        dev_err(&client->dev, "No factory mode support for M09/GENERIC_FT\n");
         return -EINVAL;
 
 }
@@ -779,7 +785,7 @@ static int edt_ft5x06_ts_identify(struct i2c_client *client,
          * at least M09 won't send 3 bytes here
          */
         if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
-                tsdata->version = M06;
+                tsdata->version = EDT_M06;
 
                 /* remove last '$' end marker */
                 rdbuf[EDT_NAME_LEN - 1] = '\0';
@@ -793,8 +799,16 @@ static int edt_ft5x06_ts_identify(struct i2c_client *client,
                 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
                 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
         } else {
-                /* since there are only two versions around (M06, M09) */
-                tsdata->version = M09;
+                /* If it is not an EDT M06 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.
+                 *
+                 * The main difference between generic focaltec based
+                 * touches and EDT M09 is that we know how to retrieve
+                 * the max coordinates for the latter.
+                 */
+                tsdata->version = GENERIC_FT;
 
                 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
                                                 2, rdbuf);
@@ -808,8 +822,34 @@ static int edt_ft5x06_ts_identify(struct i2c_client *client,
                 if (error)
                         return error;
 
-                snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
-                        rdbuf[0] >> 4, rdbuf[0] & 0x0F);
+                /* This "model identification" is not exact. Unfortunately
+                 * not all firmwares for the ft5x06 put useful values in
+                 * the identification registers.
+                 */
+                switch (rdbuf[0]) {
+                case 0x35:   /* EDT EP0350M09 */
+                case 0x43:   /* EDT EP0430M09 */
+                case 0x50:   /* EDT EP0500M09 */
+                case 0x57:   /* EDT EP0570M09 */
+                case 0x70:   /* EDT EP0700M09 */
+                        tsdata->version = EDT_M09;
+                        snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
+                                rdbuf[0] >> 4, rdbuf[0] & 0x0F);
+                        break;
+                case 0xa1:   /* EDT EP1010ML00 */
+                        tsdata->version = EDT_M09;
+                        snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00",
+                                rdbuf[0] >> 4, rdbuf[0] & 0x0F);
+                        break;
+                case 0x5a:   /* Solomon Goldentek Display */
+                        snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0");
+                        break;
+                default:
+                        snprintf(model_name, EDT_NAME_LEN,
+                                 "generic ft5x06 (%02x)",
+                                 rdbuf[0]);
+                        break;
+                }
         }
 
         return 0;
@@ -853,8 +893,16 @@ edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
         if (reg_addr->reg_report_rate != NO_REGISTER)
                 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
                                                 reg_addr->reg_report_rate);
-        tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
-        tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
+        if (tsdata->version == EDT_M06 ||
+            tsdata->version == EDT_M09) {
+                tsdata->num_x = edt_ft5x06_register_read(tsdata,
+                                                         reg_addr->reg_num_x);
+                tsdata->num_y = edt_ft5x06_register_read(tsdata,
+                                                         reg_addr->reg_num_y);
+        } else {
+                tsdata->num_x = -1;
+                tsdata->num_y = -1;
+        }
 }
 
 static void
@@ -863,7 +911,7 @@ edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
         struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
 
         switch (tsdata->version) {
-        case M06:
+        case EDT_M06:
                 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
                 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
                 reg_addr->reg_gain = WORK_REGISTER_GAIN;
@@ -872,7 +920,7 @@ edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
                 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
                 break;
 
-        case M09:
+        case EDT_M09:
                 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
                 reg_addr->reg_report_rate = NO_REGISTER;
                 reg_addr->reg_gain = M09_REGISTER_GAIN;
@@ -880,6 +928,13 @@ edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
                 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
                 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
                 break;
+
+        case GENERIC_FT:
+                /* this is a guesswork */
+                reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
+                reg_addr->reg_gain = M09_REGISTER_GAIN;
+                reg_addr->reg_offset = M09_REGISTER_OFFSET;
+                break;
         }
 }
 
@@ -969,10 +1024,19 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
         input->id.bustype = BUS_I2C;
         input->dev.parent = &client->dev;
 
-        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,
-                             0, tsdata->num_y * 64 - 1, 0, 0);
+        if (tsdata->version == EDT_M06 ||
+            tsdata->version == EDT_M09) {
+                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,
+                                     0, tsdata->num_y * 64 - 1, 0, 0);
+        } else {
+                /* Unknown maximum values. Specify via devicetree */
+                input_set_abs_params(input, ABS_MT_POSITION_X,
+                                     0, 65535, 0, 0);
+                input_set_abs_params(input, ABS_MT_POSITION_Y,
+                                     0, 65535, 0, 0);
+        }
 
         touchscreen_parse_properties(input, true, &tsdata->prop);