1 files changed, 223 insertions, 130 deletions

diff --git a/drivers/input/touchscreen/elo.c b/drivers/input/touchscreen/elo.c
index c86a2eb310f..8051a4b704e 100644
--- a/drivers/input/touchscreen/elo.c
+++ b/drivers/input/touchscreen/elo.c
@@ -22,7 +22,7 @@
 #include <linux/slab.h>
 #include <linux/input.h>
 #include <linux/serio.h>
-#include <linux/init.h>
+#include <linux/ctype.h>
 
 #define DRIVER_DESC	"Elo serial touchscreen driver"
 
@@ -34,7 +34,19 @@ MODULE_LICENSE("GPL");
  * Definitions & global arrays.
  */
 
-#define	ELO_MAX_LENGTH	10
+#define ELO_MAX_LENGTH		10
+
+#define ELO10_PACKET_LEN	8
+#define ELO10_TOUCH		0x03
+#define ELO10_PRESSURE		0x80
+
+#define ELO10_LEAD_BYTE		'U'
+
+#define ELO10_ID_CMD		'i'
+
+#define ELO10_TOUCH_PACKET	'T'
+#define ELO10_ACK_PACKET	'A'
+#define ELI10_ID_PACKET		'I'
 
 /*
  * Per-touchscreen data.
@@ -43,51 +55,70 @@ MODULE_LICENSE("GPL");
 struct elo {
 	struct input_dev *dev;
 	struct serio *serio;
+	struct mutex cmd_mutex;
+	struct completion cmd_done;
 	int id;
 	int idx;
+	unsigned char expected_packet;
 	unsigned char csum;
 	unsigned char data[ELO_MAX_LENGTH];
+	unsigned char response[ELO10_PACKET_LEN];
 	char phys[32];
 };
 
-static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
+static void elo_process_data_10(struct elo *elo, unsigned char data)
 {
 	struct input_dev *dev = elo->dev;
 
-	elo->csum += elo->data[elo->idx] = data;
+	elo->data[elo->idx] = data;
 
 	switch (elo->idx++) {
-
-		case 0:
-			if (data != 'U') {
-				elo->idx = 0;
-				elo->csum = 0;
-			}
-			break;
-
-		case 1:
-			if (data != 'T') {
-				elo->idx = 0;
-				elo->csum = 0;
-			}
-			break;
-
-		case 9:
-			if (elo->csum) {
-				input_regs(dev, regs);
-				input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
-				input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
-				input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]);
-				input_report_key(dev, BTN_TOUCH, elo->data[8] || elo->data[7]);
-				input_sync(dev);
-			}
+	case 0:
+		elo->csum = 0xaa;
+		if (data != ELO10_LEAD_BYTE) {
+			dev_dbg(&elo->serio->dev,
+				"unsynchronized data: 0x%02x\n", data);
 			elo->idx = 0;
-			elo->csum = 0;
+		}
+		break;
+
+	case 9:
+		elo->idx = 0;
+		if (data != elo->csum) {
+			dev_dbg(&elo->serio->dev,
+				"bad checksum: 0x%02x, expected 0x%02x\n",
+				 data, elo->csum);
 			break;
+		}
+		if (elo->data[1] != elo->expected_packet) {
+			if (elo->data[1] != ELO10_TOUCH_PACKET)
+				dev_dbg(&elo->serio->dev,
+					"unexpected packet: 0x%02x\n",
+					 elo->data[1]);
+			break;
+		}
+		if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) {
+			input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
+			input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
+			if (elo->data[2] & ELO10_PRESSURE)
+				input_report_abs(dev, ABS_PRESSURE,
+						(elo->data[8] << 8) | elo->data[7]);
+			input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH);
+			input_sync(dev);
+		} else if (elo->data[1] == ELO10_ACK_PACKET) {
+			if (elo->data[2] == '0')
+				elo->expected_packet = ELO10_TOUCH_PACKET;
+			complete(&elo->cmd_done);
+		} else {
+			memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN);
+			elo->expected_packet = ELO10_ACK_PACKET;
+		}
+		break;
 	}
+	elo->csum += data;
 }
 
-static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
+static void elo_process_data_6(struct elo *elo, unsigned char data)
 {
 	struct input_dev *dev = elo->dev;
 
@@ -95,47 +126,57 @@ static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_re
 
 	switch (elo->idx++) {
 
-		case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
-		case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
-		case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;
-
-		case 3:
-			if (data & 0xc0) {
-				elo->idx = 0;
-				break;
-			}
+	case 0:
+		if ((data & 0xc0) != 0xc0)
+			elo->idx = 0;
+		break;
 
-			input_regs(dev, regs);
-			input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
-			input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
+	case 1:
+		if ((data & 0xc0) != 0x80)
+			elo->idx = 0;
+		break;
 
-			if (elo->id == 2) {
-				input_report_key(dev, BTN_TOUCH, 1);
-				input_sync(dev);
-				elo->idx = 0;
-			}
+	case 2:
+		if ((data & 0xc0) != 0x40)
+			elo->idx = 0;
+		break;
 
+	case 3:
+		if (data & 0xc0) {
+			elo->idx = 0;
 			break;
+		}
 
-		case 4:
-			if (data) {
-				input_sync(dev);
-				elo->idx = 0;
-			}
-			break;
+		input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
+		input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
 
-		case 5:
-			if ((data & 0xf0) == 0) {
-				input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
-				input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
-			}
+		if (elo->id == 2) {
+			input_report_key(dev, BTN_TOUCH, 1);
 			input_sync(dev);
 			elo->idx = 0;
-			break;
+		}
+
+		break;
+
+	case 4:
+		if (data) {
+			input_sync(dev);
+			elo->idx = 0;
+		}
+		break;
+
+	case 5:
+		if ((data & 0xf0) == 0) {
+			input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
+			input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
+		}
+		input_sync(dev);
+		elo->idx = 0;
+		break;
 	}
 }
 
-static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
+static void elo_process_data_3(struct elo *elo, unsigned char data)
 {
 	struct input_dev *dev = elo->dev;
 
@@ -143,42 +184,103 @@ static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_re
 
 	switch (elo->idx++) {
 
-		case 0:
-			if ((data & 0x7f) != 0x01)
-				elo->idx = 0;
-			break;
-		case 2:
-			input_regs(dev, regs);
-			input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
-			input_report_abs(dev, ABS_X, elo->data[1]);
-			input_report_abs(dev, ABS_Y, elo->data[2]);
-			input_sync(dev);
+	case 0:
+		if ((data & 0x7f) != 0x01)
 			elo->idx = 0;
-			break;
+		break;
+	case 2:
+		input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
+		input_report_abs(dev, ABS_X, elo->data[1]);
+		input_report_abs(dev, ABS_Y, elo->data[2]);
+		input_sync(dev);
+		elo->idx = 0;
+		break;
 	}
 }
 
 static irqreturn_t elo_interrupt(struct serio *serio,
-		unsigned char data, unsigned int flags, struct pt_regs *regs)
+		unsigned char data, unsigned int flags)
 {
-	struct elo* elo = serio_get_drvdata(serio);
+	struct elo *elo = serio_get_drvdata(serio);
 
-	switch(elo->id) {
-		case 0:
-			elo_process_data_10(elo, data, regs);
-			break;
+	switch (elo->id) {
+	case 0:
+		elo_process_data_10(elo, data);
+		break;
+
+	case 1:
+	case 2:
+		elo_process_data_6(elo, data);
+		break;
+
+	case 3:
+		elo_process_data_3(elo, data);
+		break;
+	}
 
-		case 1:
-		case 2:
-			elo_process_data_6(elo, data, regs);
-			break;
+	return IRQ_HANDLED;
+}
 
-		case 3:
-			elo_process_data_3(elo, data, regs);
-			break;
+static int elo_command_10(struct elo *elo, unsigned char *packet)
+{
+	int rc = -1;
+	int i;
+	unsigned char csum = 0xaa + ELO10_LEAD_BYTE;
+
+	mutex_lock(&elo->cmd_mutex);
+
+	serio_pause_rx(elo->serio);
+	elo->expected_packet = toupper(packet[0]);
+	init_completion(&elo->cmd_done);
+	serio_continue_rx(elo->serio);
+
+	if (serio_write(elo->serio, ELO10_LEAD_BYTE))
+		goto out;
+
+	for (i = 0; i < ELO10_PACKET_LEN; i++) {
+		csum += packet[i];
+		if (serio_write(elo->serio, packet[i]))
+			goto out;
 	}
 
-	return IRQ_HANDLED;
+	if (serio_write(elo->serio, csum))
+		goto out;
+
+	wait_for_completion_timeout(&elo->cmd_done, HZ);
+
+	if (elo->expected_packet == ELO10_TOUCH_PACKET) {
+		/* We are back in reporting mode, the command was ACKed */
+		memcpy(packet, elo->response, ELO10_PACKET_LEN);
+		rc = 0;
+	}
+
+ out:
+	mutex_unlock(&elo->cmd_mutex);
+	return rc;
+}
+
+static int elo_setup_10(struct elo *elo)
+{
+	static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" };
+	struct input_dev *dev = elo->dev;
+	unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD };
+
+	if (elo_command_10(elo, packet))
+		return -1;
+
+	dev->id.version = (packet[5] << 8) | packet[4];
+
+	input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0);
+	input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0);
+	if (packet[3] & ELO10_PRESSURE)
+		input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
+
+	dev_info(&elo->serio->dev,
+		 "%sTouch touchscreen, fw: %02x.%02x, features: 0x%02x, controller: 0x%02x\n",
+		 elo_types[(packet[1] -'0') & 0x03],
+		 packet[5], packet[4], packet[3], packet[7]);
+
+	return 0;
 }
 
 /*
@@ -187,11 +289,13 @@ static irqreturn_t elo_interrupt(struct serio *serio,
 
 static void elo_disconnect(struct serio *serio)
 {
-	struct elo* elo = serio_get_drvdata(serio);
+	struct elo *elo = serio_get_drvdata(serio);
 
+	input_get_device(elo->dev);
 	input_unregister_device(elo->dev);
 	serio_close(serio);
 	serio_set_drvdata(serio, NULL);
+	input_put_device(elo->dev);
 	kfree(elo);
 }
 
@@ -211,59 +315,64 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv)
 	input_dev = input_allocate_device();
 	if (!elo || !input_dev) {
 		err = -ENOMEM;
-		goto fail;
+		goto fail1;
 	}
 
 	elo->serio = serio;
 	elo->id = serio->id.id;
 	elo->dev = input_dev;
+	elo->expected_packet = ELO10_TOUCH_PACKET;
+	mutex_init(&elo->cmd_mutex);
+	init_completion(&elo->cmd_done);
 	snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
 
-	input_dev->private = elo;
 	input_dev->name = "Elo Serial TouchScreen";
 	input_dev->phys = elo->phys;
 	input_dev->id.bustype = BUS_RS232;
 	input_dev->id.vendor = SERIO_ELO;
 	input_dev->id.product = elo->id;
 	input_dev->id.version = 0x0100;
-	input_dev->cdev.dev = &serio->dev;
+	input_dev->dev.parent = &serio->dev;
 
-	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
-	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+	serio_set_drvdata(serio, elo);
+	err = serio_open(serio, drv);
+	if (err)
+		goto fail2;
 
 	switch (elo->id) {
 
-		case 0: /* 10-byte protocol */
-			input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
-			input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
-			input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
-			break;
+	case 0: /* 10-byte protocol */
+		if (elo_setup_10(elo))
+			goto fail3;
 
-		case 1: /* 6-byte protocol */
-			input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
+		break;
 
-		case 2: /* 4-byte protocol */
-			input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
-			input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
-			break;
+	case 1: /* 6-byte protocol */
+		input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
 
-		case 3: /* 3-byte protocol */
-			input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
-			input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
-			break;
-	}
+	case 2: /* 4-byte protocol */
+		input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
+		input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
+		break;
 
-	serio_set_drvdata(serio, elo);
+	case 3: /* 3-byte protocol */
+		input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
+		input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
+		break;
+	}
 
-	err = serio_open(serio, drv);
+	err = input_register_device(elo->dev);
 	if (err)
-		goto fail;
+		goto fail3;
 
-	input_register_device(elo->dev);
 	return 0;
 
- fail:	serio_set_drvdata(serio, NULL);
-	input_free_device(input_dev);
+ fail3: serio_close(serio);
+ fail2:	serio_set_drvdata(serio, NULL);
+ fail1:	input_free_device(input_dev);
 	kfree(elo);
 	return err;
 }
@@ -295,20 +404,4 @@ static struct serio_driver elo_drv = {
 	.disconnect	= elo_disconnect,
 };
 
-/*
- * The functions for inserting/removing us as a module.
- */
-
-static int __init elo_init(void)
-{
-	serio_register_driver(&elo_drv);
-	return 0;
-}
-
-static void __exit elo_exit(void)
-{
-	serio_unregister_driver(&elo_drv);
-}
-
-module_init(elo_init);
-module_exit(elo_exit);
+module_serio_driver(elo_drv);