Merge branch 'next' into for-linus

Prepare input updates for 4.12 merge window.

10 files changed, 1296 insertions, 567 deletions

diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 096abb4ad5cd..89ebb8f39fee 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -78,6 +78,18 @@ config MOUSE_PS2_SYNAPTICS
 
 	  If unsure, say Y.
 
+config MOUSE_PS2_SYNAPTICS_SMBUS
+	bool "Synaptics PS/2 SMbus companion" if EXPERT
+	default y
+	depends on MOUSE_PS2
+	depends on I2C=y || I2C=MOUSE_PS2
+	select MOUSE_PS2_SMBUS
+	help
+	  Say Y here if you have a Synaptics RMI4 touchpad connected to
+	  to an SMBus, but enumerated through PS/2.
+
+	  If unsure, say Y.
+
 config MOUSE_PS2_CYPRESS
        bool "Cypress PS/2 mouse protocol extension" if EXPERT
        default y
@@ -171,6 +183,10 @@ config MOUSE_PS2_VMMOUSE
 
 	  If unsure, say N.
 
+config MOUSE_PS2_SMBUS
+	bool
+	depends on MOUSE_PS2
+
 config MOUSE_SERIAL
 	tristate "Serial mouse"
 	select SERIO
diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index 6168b134937b..56bf0ad877c6 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -39,6 +39,8 @@ psmouse-$(CONFIG_MOUSE_PS2_TOUCHKIT)	+= touchkit_ps2.o
 psmouse-$(CONFIG_MOUSE_PS2_CYPRESS)	+= cypress_ps2.o
 psmouse-$(CONFIG_MOUSE_PS2_VMMOUSE)	+= vmmouse.o
 
+psmouse-$(CONFIG_MOUSE_PS2_SMBUS)	+= psmouse-smbus.o
+
 elan_i2c-objs := elan_i2c_core.o
 elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_I2C)	+= elan_i2c_i2c.o
 elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_SMBUS)	+= elan_i2c_smbus.o
diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index f210e19ddba6..262d1057c1da 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -106,39 +106,36 @@ static const struct alps_nibble_commands alps_v6_nibble_commands[] = {
 #define ALPS_DUALPOINT_WITH_PRESSURE	0x400	/* device can report trackpoint pressure */
 
 static const struct alps_model_info alps_model_data[] = {
-	{ { 0x32, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },	/* Toshiba Salellite Pro M10 */
-	{ { 0x33, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V1, 0x88, 0xf8, 0 } },				/* UMAX-530T */
-	{ { 0x53, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
-	{ { 0x53, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
-	{ { 0x60, 0x03, 0xc8 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },				/* HP ze1115 */
-	{ { 0x63, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
-	{ { 0x63, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
-	{ { 0x63, 0x02, 0x28 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },		/* Fujitsu Siemens S6010 */
-	{ { 0x63, 0x02, 0x3c }, 0x00, { ALPS_PROTO_V2, 0x8f, 0x8f, ALPS_WHEEL } },		/* Toshiba Satellite S2400-103 */
-	{ { 0x63, 0x02, 0x50 }, 0x00, { ALPS_PROTO_V2, 0xef, 0xef, ALPS_FW_BK_1 } },		/* NEC Versa L320 */
-	{ { 0x63, 0x02, 0x64 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
-	{ { 0x63, 0x03, 0xc8 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },	/* Dell Latitude D800 */
-	{ { 0x73, 0x00, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_DUALPOINT } },		/* ThinkPad R61 8918-5QG */
-	{ { 0x73, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
-	{ { 0x73, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },		/* Ahtec Laptop */
-
 	/*
 	 * XXX This entry is suspicious. First byte has zero lower nibble,
 	 * which is what a normal mouse would report. Also, the value 0x0e
 	 * isn't valid per PS/2 spec.
 	 */
-	{ { 0x20, 0x02, 0x0e }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
-
-	{ { 0x22, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
-	{ { 0x22, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT } },	/* Dell Latitude D600 */
-	/* Dell Latitude E5500, E6400, E6500, Precision M4400 */
-	{ { 0x62, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xcf, 0xcf,
-		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },
-	{ { 0x73, 0x00, 0x14 }, 0x00, { ALPS_PROTO_V6, 0xff, 0xff, ALPS_DUALPOINT } },		/* Dell XT2 */
-	{ { 0x73, 0x02, 0x50 }, 0x00, { ALPS_PROTO_V2, 0xcf, 0xcf, ALPS_FOUR_BUTTONS } },	/* Dell Vostro 1400 */
-	{ { 0x52, 0x01, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xff, 0xff,
+	{ { 0x20, 0x02, 0x0e }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
+
+	{ { 0x22, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
+	{ { 0x22, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT } },	/* Dell Latitude D600 */
+	{ { 0x32, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },	/* Toshiba Salellite Pro M10 */
+	{ { 0x33, 0x02, 0x0a }, { ALPS_PROTO_V1, 0x88, 0xf8, 0 } },				/* UMAX-530T */
+	{ { 0x52, 0x01, 0x14 }, { ALPS_PROTO_V2, 0xff, 0xff,
 		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },				/* Toshiba Tecra A11-11L */
-	{ { 0x73, 0x02, 0x64 }, 0x8a, { ALPS_PROTO_V4, 0x8f, 0x8f, 0 } },
+	{ { 0x53, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x53, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x60, 0x03, 0xc8 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },				/* HP ze1115 */
+	{ { 0x62, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xcf, 0xcf,
+		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },				/* Dell Latitude E5500, E6400, E6500, Precision M4400 */
+	{ { 0x63, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x63, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x63, 0x02, 0x28 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },			/* Fujitsu Siemens S6010 */
+	{ { 0x63, 0x02, 0x3c }, { ALPS_PROTO_V2, 0x8f, 0x8f, ALPS_WHEEL } },			/* Toshiba Satellite S2400-103 */
+	{ { 0x63, 0x02, 0x50 }, { ALPS_PROTO_V2, 0xef, 0xef, ALPS_FW_BK_1 } },			/* NEC Versa L320 */
+	{ { 0x63, 0x02, 0x64 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x63, 0x03, 0xc8 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },	/* Dell Latitude D800 */
+	{ { 0x73, 0x00, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_DUALPOINT } },		/* ThinkPad R61 8918-5QG */
+	{ { 0x73, 0x00, 0x14 }, { ALPS_PROTO_V6, 0xff, 0xff, ALPS_DUALPOINT } },		/* Dell XT2 */
+	{ { 0x73, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x73, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },			/* Ahtec Laptop */
+	{ { 0x73, 0x02, 0x50 }, { ALPS_PROTO_V2, 0xcf, 0xcf, ALPS_FOUR_BUTTONS } },		/* Dell Vostro 1400 */
 };
 
 static const struct alps_protocol_info alps_v3_protocol_data = {
@@ -149,6 +146,10 @@ static const struct alps_protocol_info alps_v3_rushmore_data = {
 	ALPS_PROTO_V3_RUSHMORE, 0x8f, 0x8f, ALPS_DUALPOINT
 };
 
+static const struct alps_protocol_info alps_v4_protocol_data = {
+	ALPS_PROTO_V4, 0x8f, 0x8f, 0
+};
+
 static const struct alps_protocol_info alps_v5_protocol_data = {
 	ALPS_PROTO_V5, 0xc8, 0xd8, 0
 };
@@ -161,6 +162,10 @@ static const struct alps_protocol_info alps_v8_protocol_data = {
 	ALPS_PROTO_V8, 0x18, 0x18, 0
 };
 
+static const struct alps_protocol_info alps_v9_protocol_data = {
+	ALPS_PROTO_V9, 0xc8, 0xc8, 0
+};
+
 /*
  * Some v2 models report the stick buttons in separate bits
  */
@@ -2806,12 +2811,8 @@ static const struct alps_protocol_info *alps_match_table(unsigned char *e7,
 	for (i = 0; i < ARRAY_SIZE(alps_model_data); i++) {
 		model = &alps_model_data[i];
 
-		if (!memcmp(e7, model->signature, sizeof(model->signature)) &&
-		    (!model->command_mode_resp ||
-		     model->command_mode_resp == ec[2])) {
-
+		if (!memcmp(e7, model->signature, sizeof(model->signature)))
 			return &model->protocol_info;
-		}
 	}
 
 	return NULL;
@@ -2849,7 +2850,10 @@ static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
 
 	protocol = alps_match_table(e7, ec);
 	if (!protocol) {
-		if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
+		if (e7[0] == 0x73 && e7[1] == 0x02 && e7[2] == 0x64 &&
+			   ec[2] == 0x8a) {
+			protocol = &alps_v4_protocol_data;
+		} else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
 			   ec[0] == 0x73 && (ec[1] == 0x01 || ec[1] == 0x02)) {
 			protocol = &alps_v5_protocol_data;
 		} else if (ec[0] == 0x88 &&
@@ -2863,6 +2867,12 @@ static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
 		} else if (e7[0] == 0x73 && e7[1] == 0x03 &&
 			   (e7[2] == 0x14 || e7[2] == 0x28)) {
 			protocol = &alps_v8_protocol_data;
+		} else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0xc8) {
+			protocol = &alps_v9_protocol_data;
+			psmouse_warn(psmouse,
+				     "Unsupported ALPS V9 touchpad: E7=%3ph, EC=%3ph\n",
+				     e7, ec);
+			return -EINVAL;
 		} else {
 			psmouse_dbg(psmouse,
 				    "Likely not an ALPS touchpad: E7=%3ph, EC=%3ph\n", e7, ec);
diff --git a/drivers/input/mouse/alps.h b/drivers/input/mouse/alps.h
index 4334f2805d93..ed2d6879fa52 100644
--- a/drivers/input/mouse/alps.h
+++ b/drivers/input/mouse/alps.h
@@ -23,6 +23,7 @@
 #define ALPS_PROTO_V6		0x600
 #define ALPS_PROTO_V7		0x700	/* t3btl t4s */
 #define ALPS_PROTO_V8		0x800	/* SS4btl SS4s */
+#define ALPS_PROTO_V9		0x900	/* ss3btl */
 
 #define MAX_TOUCHES	4
 
@@ -172,10 +173,6 @@ struct alps_protocol_info {
 /**
  * struct alps_model_info - touchpad ID table
  * @signature: E7 response string to match.
- * @command_mode_resp: For V3/V4 touchpads, the final byte of the EC response
- *   (aka command mode response) identifies the firmware minor version.  This
- *   can be used to distinguish different hardware models which are not
- *   uniquely identifiable through their E7 responses.
  * @protocol_info: information about protocol used by the device.
  *
  * Many (but not all) ALPS touchpads can be identified by looking at the
@@ -184,7 +181,6 @@ struct alps_protocol_info {
  */
 struct alps_model_info {
 	u8 signature[3];
-	u8 command_mode_resp;
 	struct alps_protocol_info protocol_info;
 };
 
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index a598b7223cef..f73b47b8c578 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -116,17 +116,6 @@ static DEFINE_MUTEX(psmouse_mutex);
 
 static struct workqueue_struct *kpsmoused_wq;
 
-struct psmouse_protocol {
-	enum psmouse_type type;
-	bool maxproto;
-	bool ignore_parity; /* Protocol should ignore parity errors from KBC */
-	bool try_passthru; /* Try protocol also on passthrough ports */
-	const char *name;
-	const char *alias;
-	int (*detect)(struct psmouse *, bool);
-	int (*init)(struct psmouse *);
-};
-
 static void psmouse_report_standard_buttons(struct input_dev *dev, u8 buttons)
 {
 	input_report_key(dev, BTN_LEFT,   buttons & BIT(0));
@@ -148,7 +137,7 @@ psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
 
 	/* Full packet accumulated, process it */
 
-	switch (psmouse->type) {
+	switch (psmouse->protocol->type) {
 	case PSMOUSE_IMPS:
 		/* IntelliMouse has scroll wheel */
 		input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
@@ -325,7 +314,8 @@ static irqreturn_t psmouse_interrupt(struct serio *serio,
 		goto out;
 
 	if (unlikely((flags & SERIO_TIMEOUT) ||
-		     ((flags & SERIO_PARITY) && !psmouse->ignore_parity))) {
+		     ((flags & SERIO_PARITY) &&
+		      !psmouse->protocol->ignore_parity))) {
 
 		if (psmouse->state == PSMOUSE_ACTIVATED)
 			psmouse_warn(psmouse,
@@ -372,7 +362,7 @@ static irqreturn_t psmouse_interrupt(struct serio *serio,
 		}
 
 		if (psmouse->packet[1] == PSMOUSE_RET_ID ||
-		    (psmouse->type == PSMOUSE_HGPK &&
+		    (psmouse->protocol->type == PSMOUSE_HGPK &&
 		     psmouse->packet[1] == PSMOUSE_RET_BAT)) {
 			__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 			serio_reconnect(serio);
@@ -783,7 +773,7 @@ static const struct psmouse_protocol psmouse_protocols[] = {
 		.name		= "SynPS/2",
 		.alias		= "synaptics",
 		.detect		= synaptics_detect,
-		.init		= synaptics_init,
+		.init		= synaptics_init_absolute,
 	},
 	{
 		.type		= PSMOUSE_SYNAPTICS_RELATIVE,
@@ -793,6 +783,16 @@ static const struct psmouse_protocol psmouse_protocols[] = {
 		.init		= synaptics_init_relative,
 	},
 #endif
+#ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
+	{
+		.type		= PSMOUSE_SYNAPTICS_SMBUS,
+		.name		= "SynSMBus",
+		.alias		= "synaptics-smbus",
+		.detect		= synaptics_detect,
+		.init		= synaptics_init_smbus,
+		.smbus_companion = true,
+	},
+#endif
 #ifdef CONFIG_MOUSE_PS2_ALPS
 	{
 		.type		= PSMOUSE_ALPS,
@@ -959,6 +959,8 @@ static void psmouse_apply_defaults(struct psmouse *psmouse)
 
 	__set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 
+	psmouse->protocol = &psmouse_protocols[0];
+
 	psmouse->set_rate = psmouse_set_rate;
 	psmouse->set_resolution = psmouse_set_resolution;
 	psmouse->set_scale = psmouse_set_scale;
@@ -966,6 +968,7 @@ static void psmouse_apply_defaults(struct psmouse *psmouse)
 	psmouse->protocol_handler = psmouse_process_byte;
 	psmouse->pktsize = 3;
 	psmouse->reconnect = NULL;
+	psmouse->fast_reconnect = NULL;
 	psmouse->disconnect = NULL;
 	psmouse->cleanup = NULL;
 	psmouse->pt_activate = NULL;
@@ -1018,6 +1021,7 @@ static int psmouse_extensions(struct psmouse *psmouse,
 			      unsigned int max_proto, bool set_properties)
 {
 	bool synaptics_hardware = false;
+	int ret;
 
 	/*
 	 * Always check for focaltech, this is safe as it uses pnp-id
@@ -1080,9 +1084,14 @@ static int psmouse_extensions(struct psmouse *psmouse,
 			 * enabled first, since we try detecting Synaptics
 			 * even when protocol is disabled.
 			 */
-			if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) &&
-			    (!set_properties || synaptics_init(psmouse) == 0)) {
-				return PSMOUSE_SYNAPTICS;
+			if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) ||
+			    IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) {
+				if (!set_properties)
+					return PSMOUSE_SYNAPTICS;
+
+				ret = synaptics_init(psmouse);
+				if (ret >= 0)
+					return ret;
 			}
 
 			/*
@@ -1431,9 +1440,8 @@ static void psmouse_cleanup(struct serio *serio)
  */
 static void psmouse_disconnect(struct serio *serio)
 {
-	struct psmouse *psmouse, *parent = NULL;
-
-	psmouse = serio_get_drvdata(serio);
+	struct psmouse *psmouse = serio_get_drvdata(serio);
+	struct psmouse *parent = NULL;
 
 	sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
 
@@ -1461,7 +1469,10 @@ static void psmouse_disconnect(struct serio *serio)
 
 	serio_close(serio);
 	serio_set_drvdata(serio, NULL);
-	input_unregister_device(psmouse->dev);
+
+	if (psmouse->dev)
+		input_unregister_device(psmouse->dev);
+
 	kfree(psmouse);
 
 	if (parent)
@@ -1475,6 +1486,7 @@ static int psmouse_switch_protocol(struct psmouse *psmouse,
 {
 	const struct psmouse_protocol *selected_proto;
 	struct input_dev *input_dev = psmouse->dev;
+	enum psmouse_type type;
 
 	input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
 
@@ -1487,15 +1499,13 @@ static int psmouse_switch_protocol(struct psmouse *psmouse,
 		if (proto->init && proto->init(psmouse) < 0)
 			return -1;
 
-		psmouse->type = proto->type;
 		selected_proto = proto;
 	} else {
-		psmouse->type = psmouse_extensions(psmouse,
-						   psmouse_max_proto, true);
-		selected_proto = psmouse_protocol_by_type(psmouse->type);
+		type = psmouse_extensions(psmouse, psmouse_max_proto, true);
+		selected_proto = psmouse_protocol_by_type(type);
 	}
 
-	psmouse->ignore_parity = selected_proto->ignore_parity;
+	psmouse->protocol = selected_proto;
 
 	/*
 	 * If mouse's packet size is 3 there is no point in polling the
@@ -1521,7 +1531,7 @@ static int psmouse_switch_protocol(struct psmouse *psmouse,
 	input_dev->phys = psmouse->phys;
 	input_dev->id.bustype = BUS_I8042;
 	input_dev->id.vendor = 0x0002;
-	input_dev->id.product = psmouse->type;
+	input_dev->id.product = psmouse->protocol->type;
 	input_dev->id.version = psmouse->model;
 
 	return 0;
@@ -1583,12 +1593,18 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
 
 	psmouse_switch_protocol(psmouse, NULL);
 
-	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
-	psmouse_initialize(psmouse);
+	if (!psmouse->protocol->smbus_companion) {
+		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+		psmouse_initialize(psmouse);
 
-	error = input_register_device(psmouse->dev);
-	if (error)
-		goto err_protocol_disconnect;
+		error = input_register_device(input_dev);
+		if (error)
+			goto err_protocol_disconnect;
+	} else {
+		/* Smbus companion will be reporting events, not us. */
+		input_free_device(input_dev);
+		psmouse->dev = input_dev = NULL;
+	}
 
 	if (parent && parent->pt_activate)
 		parent->pt_activate(parent);
@@ -1597,7 +1613,12 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
 	if (error)
 		goto err_pt_deactivate;
 
-	psmouse_activate(psmouse);
+	/*
+	 * PS/2 devices having SMBus companions should stay disabled
+	 * on PS/2 side, in order to have SMBus part operable.
+	 */
+	if (!psmouse->protocol->smbus_companion)
+		psmouse_activate(psmouse);
 
  out:
 	/* If this is a pass-through port the parent needs to be re-activated */
@@ -1610,8 +1631,10 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
  err_pt_deactivate:
 	if (parent && parent->pt_deactivate)
 		parent->pt_deactivate(parent);
-	input_unregister_device(psmouse->dev);
-	input_dev = NULL; /* so we don't try to free it below */
+	if (input_dev) {
+		input_unregister_device(input_dev);
+		input_dev = NULL; /* so we don't try to free it below */
+	}
  err_protocol_disconnect:
 	if (psmouse->disconnect)
 		psmouse->disconnect(psmouse);
@@ -1628,15 +1651,26 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
 	goto out;
 }
 
-static int psmouse_reconnect(struct serio *serio)
+static int __psmouse_reconnect(struct serio *serio, bool fast_reconnect)
 {
 	struct psmouse *psmouse = serio_get_drvdata(serio);
 	struct psmouse *parent = NULL;
-	unsigned char type;
+	int (*reconnect_handler)(struct psmouse *);
+	enum psmouse_type type;
 	int rc = -1;
 
 	mutex_lock(&psmouse_mutex);
 
+	if (fast_reconnect) {
+		reconnect_handler = psmouse->fast_reconnect;
+		if (!reconnect_handler) {
+			rc = -ENOENT;
+			goto out_unlock;
+		}
+	} else {
+		reconnect_handler = psmouse->reconnect;
+	}
+
 	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
 		parent = serio_get_drvdata(serio->parent);
 		psmouse_deactivate(parent);
@@ -1644,8 +1678,8 @@ static int psmouse_reconnect(struct serio *serio)
 
 	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
 
-	if (psmouse->reconnect) {
-		if (psmouse->reconnect(psmouse))
+	if (reconnect_handler) {
+		if (reconnect_handler(psmouse))
 			goto out;
 	} else {
 		psmouse_reset(psmouse);
@@ -1654,7 +1688,7 @@ static int psmouse_reconnect(struct serio *serio)
 			goto out;
 
 		type = psmouse_extensions(psmouse, psmouse_max_proto, false);
-		if (psmouse->type != type)
+		if (psmouse->protocol->type != type)
 			goto out;
 	}
 
@@ -1662,14 +1696,21 @@ static int psmouse_reconnect(struct serio *serio)
 	 * OK, the device type (and capabilities) match the old one,
 	 * we can continue using it, complete initialization
 	 */
-	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
-
-	psmouse_initialize(psmouse);
+	if (!psmouse->protocol->smbus_companion) {
+		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+		psmouse_initialize(psmouse);
+	}
 
 	if (parent && parent->pt_activate)
 		parent->pt_activate(parent);
 
-	psmouse_activate(psmouse);
+	/*
+	 * PS/2 devices having SMBus companions should stay disabled
+	 * on PS/2 side, in order to have SMBus part operable.
+	 */
+	if (!psmouse->protocol->smbus_companion)
+		psmouse_activate(psmouse);
+
 	rc = 0;
 
 out:
@@ -1677,10 +1718,21 @@ out:
 	if (parent)
 		psmouse_activate(parent);
 
+out_unlock:
 	mutex_unlock(&psmouse_mutex);
 	return rc;
 }
 
+static int psmouse_reconnect(struct serio *serio)
+{
+	return __psmouse_reconnect(serio, false);
+}
+
+static int psmouse_fast_reconnect(struct serio *serio)
+{
+	return __psmouse_reconnect(serio, true);
+}
+
 static struct serio_device_id psmouse_serio_ids[] = {
 	{
 		.type	= SERIO_8042,
@@ -1708,6 +1760,7 @@ static struct serio_driver psmouse_drv = {
 	.interrupt	= psmouse_interrupt,
 	.connect	= psmouse_connect,
 	.reconnect	= psmouse_reconnect,
+	.fast_reconnect	= psmouse_fast_reconnect,
 	.disconnect	= psmouse_disconnect,
 	.cleanup	= psmouse_cleanup,
 };
@@ -1717,9 +1770,11 @@ ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *de
 {
 	struct serio *serio = to_serio_port(dev);
 	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
-	struct psmouse *psmouse;
+	struct psmouse *psmouse = serio_get_drvdata(serio);
 
-	psmouse = serio_get_drvdata(serio);
+	if (psmouse->protocol->smbus_companion &&
+			devattr != &psmouse_attr_protocol.dattr)
+		return -ENOENT;
 
 	return attr->show(psmouse, attr->data, buf);
 }
@@ -1738,6 +1793,12 @@ ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *dev
 
 	psmouse = serio_get_drvdata(serio);
 
+	if (psmouse->protocol->smbus_companion &&
+			devattr != &psmouse_attr_protocol.dattr) {
+		retval = -ENOENT;
+		goto out_unlock;
+	}
+
 	if (attr->protect) {
 		if (psmouse->state == PSMOUSE_IGNORE) {
 			retval = -ENODEV;
@@ -1749,13 +1810,14 @@ ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *dev
 			psmouse_deactivate(parent);
 		}
 
-		psmouse_deactivate(psmouse);
+		if (!psmouse->protocol->smbus_companion)
+			psmouse_deactivate(psmouse);
 	}
 
 	retval = attr->set(psmouse, attr->data, buf, count);
 
 	if (attr->protect) {
-		if (retval != -ENODEV)
+		if (retval != -ENODEV && !psmouse->protocol->smbus_companion)
 			psmouse_activate(psmouse);
 
 		if (parent)
@@ -1792,7 +1854,7 @@ static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const
 
 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
 {
-	return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
+	return sprintf(buf, "%s\n", psmouse->protocol->name);
 }
 
 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
@@ -1808,7 +1870,7 @@ static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, co
 	if (!proto)
 		return -EINVAL;
 
-	if (psmouse->type == proto->type)
+	if (psmouse->protocol == proto)
 		return count;
 
 	new_dev = input_allocate_device();
@@ -1832,7 +1894,7 @@ static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, co
 			return -ENODEV;
 		}
 
-		if (psmouse->type == proto->type) {
+		if (psmouse->protocol == proto) {
 			input_free_device(new_dev);
 			return count; /* switched by other thread */
 		}
@@ -1845,7 +1907,7 @@ static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, co
 	}
 
 	old_dev = psmouse->dev;
-	old_proto = psmouse_protocol_by_type(psmouse->type);
+	old_proto = psmouse->protocol;
 
 	if (psmouse->disconnect)
 		psmouse->disconnect(psmouse);
@@ -1864,23 +1926,29 @@ static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, co
 	psmouse_initialize(psmouse);
 	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
 
-	error = input_register_device(psmouse->dev);
-	if (error) {
-		if (psmouse->disconnect)
-			psmouse->disconnect(psmouse);
+	if (psmouse->protocol->smbus_companion) {
+		input_free_device(psmouse->dev);
+		psmouse->dev = NULL;
+	} else {
+		error = input_register_device(psmouse->dev);
+		if (error) {
+			if (psmouse->disconnect)
+				psmouse->disconnect(psmouse);
 
-		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
-		input_free_device(new_dev);
-		psmouse->dev = old_dev;
-		psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
-		psmouse_switch_protocol(psmouse, old_proto);
-		psmouse_initialize(psmouse);
-		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+			psmouse_set_state(psmouse, PSMOUSE_IGNORE);
+			input_free_device(new_dev);
+			psmouse->dev = old_dev;
+			psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
+			psmouse_switch_protocol(psmouse, old_proto);
+			psmouse_initialize(psmouse);
+			psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
 
-		return error;
+			return error;
+		}
 	}
 
-	input_unregister_device(old_dev);
+	if (old_dev)
+		input_unregister_device(old_dev);
 
 	if (parent && parent->pt_activate)
 		parent->pt_activate(parent);
@@ -1947,16 +2015,27 @@ static int __init psmouse_init(void)
 	synaptics_module_init();
 	hgpk_module_init();
 
+	err = psmouse_smbus_module_init();
+	if (err)
+		return err;
+
 	kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
 	if (!kpsmoused_wq) {
 		pr_err("failed to create kpsmoused workqueue\n");
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto err_smbus_exit;
 	}
 
 	err = serio_register_driver(&psmouse_drv);
 	if (err)
-		destroy_workqueue(kpsmoused_wq);
+		goto err_destroy_wq;
+
+	return 0;
 
+err_destroy_wq:
+	destroy_workqueue(kpsmoused_wq);
+err_smbus_exit:
+	psmouse_smbus_module_exit();
 	return err;
 }
 
@@ -1964,6 +2043,7 @@ static void __exit psmouse_exit(void)
 {
 	serio_unregister_driver(&psmouse_drv);
 	destroy_workqueue(kpsmoused_wq);
+	psmouse_smbus_module_exit();
 }
 
 module_init(psmouse_init);
diff --git a/drivers/input/mouse/psmouse-smbus.c b/drivers/input/mouse/psmouse-smbus.c
new file mode 100644
index 000000000000..c7ac24d119c1
--- /dev/null
+++ b/drivers/input/mouse/psmouse-smbus.c
@@ -0,0 +1,302 @@
+/*
+ * Copyright (c) 2017 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/libps2.h>
+#include <linux/i2c.h>
+#include <linux/serio.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include "psmouse.h"
+
+struct psmouse_smbus_dev {
+	struct i2c_board_info board;
+	struct psmouse *psmouse;
+	struct i2c_client *client;
+	struct list_head node;
+	bool dead;
+};
+
+static LIST_HEAD(psmouse_smbus_list);
+static DEFINE_MUTEX(psmouse_smbus_mutex);
+
+static void psmouse_smbus_check_adapter(struct i2c_adapter *adapter)
+{
+	struct psmouse_smbus_dev *smbdev;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_HOST_NOTIFY))
+		return;
+
+	mutex_lock(&psmouse_smbus_mutex);
+
+	list_for_each_entry(smbdev, &psmouse_smbus_list, node) {
+		if (smbdev->dead)
+			continue;
+
+		if (smbdev->client)
+			continue;
+
+		/*
+		 * Here would be a good place to check if device is actually
+		 * present, but it seems that SMBus will not respond unless we
+		 * fully reset PS/2 connection.  So cross our fingers, and try
+		 * to switch over, hopefully our system will not have too many
+		 * "host notify" I2C adapters.
+		 */
+		psmouse_dbg(smbdev->psmouse,
+			    "SMBus candidate adapter appeared, triggering rescan\n");
+		serio_rescan(smbdev->psmouse->ps2dev.serio);
+	}
+
+	mutex_unlock(&psmouse_smbus_mutex);
+}
+
+static void psmouse_smbus_detach_i2c_client(struct i2c_client *client)
+{
+	struct psmouse_smbus_dev *smbdev, *tmp;
+
+	mutex_lock(&psmouse_smbus_mutex);
+
+	list_for_each_entry_safe(smbdev, tmp, &psmouse_smbus_list, node) {
+		if (smbdev->client != client)
+			continue;
+
+		kfree(client->dev.platform_data);
+		client->dev.platform_data = NULL;
+
+		if (!smbdev->dead) {
+			psmouse_dbg(smbdev->psmouse,
+				    "Marking SMBus companion %s as gone\n",
+				    dev_name(&smbdev->client->dev));
+			smbdev->dead = true;
+			serio_rescan(smbdev->psmouse->ps2dev.serio);
+		} else {
+			list_del(&smbdev->node);
+			kfree(smbdev);
+		}
+	}
+
+	mutex_unlock(&psmouse_smbus_mutex);
+}
+
+static int psmouse_smbus_notifier_call(struct notifier_block *nb,
+				       unsigned long action, void *data)
+{
+	struct device *dev = data;
+
+	switch (action) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (dev->type == &i2c_adapter_type)
+			psmouse_smbus_check_adapter(to_i2c_adapter(dev));
+		break;
+
+	case BUS_NOTIFY_REMOVED_DEVICE:
+		if (dev->type == &i2c_client_type)
+			psmouse_smbus_detach_i2c_client(to_i2c_client(dev));
+		break;
+	}
+
+	return 0;
+}
+
+static struct notifier_block psmouse_smbus_notifier = {
+	.notifier_call = psmouse_smbus_notifier_call,
+};
+
+static psmouse_ret_t psmouse_smbus_process_byte(struct psmouse *psmouse)
+{
+	return PSMOUSE_FULL_PACKET;
+}
+
+static int psmouse_smbus_reconnect(struct psmouse *psmouse)
+{
+	psmouse_deactivate(psmouse);
+
+	return 0;
+}
+
+struct psmouse_smbus_removal_work {
+	struct work_struct work;
+	struct i2c_client *client;
+};
+
+static void psmouse_smbus_remove_i2c_device(struct work_struct *work)
+{
+	struct psmouse_smbus_removal_work *rwork =
+		container_of(work, struct psmouse_smbus_removal_work, work);
+
+	dev_dbg(&rwork->client->dev, "destroying SMBus companion device\n");
+	i2c_unregister_device(rwork->client);
+
+	kfree(rwork);
+}
+
+/*
+ * This schedules removal of SMBus companion device. We have to do
+ * it in a separate tread to avoid deadlocking on psmouse_mutex in
+ * case the device has a trackstick (which is also driven by psmouse).
+ *
+ * Note that this may be racing with i2c adapter removal, but we
+ * can't do anything about that: i2c automatically destroys clients
+ * attached to an adapter that is being removed. This has to be
+ * fixed in i2c core.
+ */
+static void psmouse_smbus_schedule_remove(struct i2c_client *client)
+{
+	struct psmouse_smbus_removal_work *rwork;
+
+	rwork = kzalloc(sizeof(*rwork), GFP_KERNEL);
+	if (rwork) {
+		INIT_WORK(&rwork->work, psmouse_smbus_remove_i2c_device);
+		rwork->client = client;
+
+		schedule_work(&rwork->work);
+	}
+}
+
+static void psmouse_smbus_disconnect(struct psmouse *psmouse)
+{
+	struct psmouse_smbus_dev *smbdev = psmouse->private;
+
+	mutex_lock(&psmouse_smbus_mutex);
+
+	if (smbdev->dead) {
+		list_del(&smbdev->node);
+		kfree(smbdev);
+	} else {
+		smbdev->dead = true;
+		psmouse_dbg(smbdev->psmouse,
+			    "posting removal request for SMBus companion %s\n",
+			    dev_name(&smbdev->client->dev));
+		psmouse_smbus_schedule_remove(smbdev->client);
+	}
+
+	mutex_unlock(&psmouse_smbus_mutex);
+
+	psmouse->private = NULL;
+}
+
+static int psmouse_smbus_create_companion(struct device *dev, void *data)
+{
+	struct psmouse_smbus_dev *smbdev = data;
+	unsigned short addr_list[] = { smbdev->board.addr, I2C_CLIENT_END };
+	struct i2c_adapter *adapter;
+
+	adapter = i2c_verify_adapter(dev);
+	if (!adapter)
+		return 0;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_HOST_NOTIFY))
+		return 0;
+
+	smbdev->client = i2c_new_probed_device(adapter, &smbdev->board,
+					       addr_list, NULL);
+	if (!smbdev->client)
+		return 0;
+
+	/* We have our(?) device, stop iterating i2c bus. */
+	return 1;
+}
+
+void psmouse_smbus_cleanup(struct psmouse *psmouse)
+{
+	struct psmouse_smbus_dev *smbdev, *tmp;
+
+	mutex_lock(&psmouse_smbus_mutex);
+
+	list_for_each_entry_safe(smbdev, tmp, &psmouse_smbus_list, node) {
+		if (psmouse == smbdev->psmouse) {
+			list_del(&smbdev->node);
+			kfree(smbdev);
+		}
+	}
+
+	mutex_unlock(&psmouse_smbus_mutex);
+}
+
+int psmouse_smbus_init(struct psmouse *psmouse,
+		       const struct i2c_board_info *board,
+		       const void *pdata, size_t pdata_size,
+		       bool leave_breadcrumbs)
+{
+	struct psmouse_smbus_dev *smbdev;
+	int error;
+
+	smbdev = kzalloc(sizeof(*smbdev), GFP_KERNEL);
+	if (!smbdev)
+		return -ENOMEM;
+
+	smbdev->psmouse = psmouse;
+	smbdev->board = *board;
+
+	smbdev->board.platform_data = kmemdup(pdata, pdata_size, GFP_KERNEL);
+	if (!smbdev->board.platform_data) {
+		kfree(smbdev);
+		return -ENOMEM;
+	}
+
+	psmouse->private = smbdev;
+	psmouse->protocol_handler = psmouse_smbus_process_byte;
+	psmouse->reconnect = psmouse_smbus_reconnect;
+	psmouse->fast_reconnect = psmouse_smbus_reconnect;
+	psmouse->disconnect = psmouse_smbus_disconnect;
+	psmouse->resync_time = 0;
+
+	psmouse_deactivate(psmouse);
+
+	mutex_lock(&psmouse_smbus_mutex);
+	list_add_tail(&smbdev->node, &psmouse_smbus_list);
+	mutex_unlock(&psmouse_smbus_mutex);