Message-Id: <20210712180434.7789-1-sumesh.k.naduvalath@intel.com>
Date:   Mon, 12 Jul 2021 23:34:34 +0530
From:   sumesh.k.naduvalath@...el.com
To:     hdegoede@...hat.com, mgross@...ux.intel.com,
        srinivas.pandruvada@...ux.intel.com
Cc:     srinivas.pandruvada@...el.com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org, ganapathi.chinnu@...el.com,
        nachiketa.kumar@...el.com, sumesh.k.naduvalath@...el.com
Subject: [RESEND PATCH v2 1/1] ishtp: Add support for Intel ishtp eclite driver

From: "K Naduvalath, Sumesh" <sumesh.k.naduvalath@...el.com>

This driver is for accessing the PSE (Programmable Service Engine), an
Embedded Controller like IP, using ISHTP (Integratd Sensor Hub Transport
Protocol) to get battery, thermal and UCSI (USB Type-C Connector System
Software Interface) related data from the platform.

Signed-off-by: K Naduvalath, Sumesh <sumesh.k.naduvalath@...el.com>
Reviewed-by: Mark Gross <mgross@...ux.intel.com>
---
Changes:

v2:
-Decoupled ACPI device search with acpi_find_device() and cache adev
-Opregion context is protected with lock for both cmd and data handlers
-Opregion length check added in various functions
-ishtp_get_device and ishtp_put_device are removed
-acpi_walk_dep_device_list() changed to acpi_dev_clear_dependencies()
-Kconfig text, cosmetic and minor corrections

v1:
-Initial Version

 MAINTAINERS                               |   6 +
 drivers/platform/x86/Kconfig              |  16 +
 drivers/platform/x86/Makefile             |   1 +
 drivers/platform/x86/intel_ishtp_eclite.c | 699 ++++++++++++++++++++++
 4 files changed, 722 insertions(+)
 create mode 100644 drivers/platform/x86/intel_ishtp_eclite.c

diff --git a/MAINTAINERS b/MAINTAINERS
index a61f4f3b78a9..bb2b5be3c745 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9391,6 +9391,12 @@ L:	linux-crypto@...r.kernel.org
 S:	Maintained
 F:	drivers/crypto/ixp4xx_crypto.c
 
+INTEL ISHTP ECLITE DRIVER
+M:	Sumesh K Naduvalath <sumesh.k.naduvalath@...el.com>
+L:	platform-driver-x86@...r.kernel.org
+S:	Supported
+F:	drivers/platform/x86/intel_ishtp_eclite.c
+
 INTEL IXP4XX QMGR, NPE, ETHERNET and HSS SUPPORT
 M:	Krzysztof Halasa <khalasa@...p.pl>
 S:	Maintained
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 7d385c3b2239..ee5fe5e52033 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1173,6 +1173,22 @@ config INTEL_CHTDC_TI_PWRBTN
 	  To compile this driver as a module, choose M here: the module
 	  will be called intel_chtdc_ti_pwrbtn.
 
+config INTEL_ISHTP_ECLITE
+	tristate "Intel ISHTP eclite controller"
+	depends on INTEL_ISH_HID
+	depends on ACPI
+	help
+	  This driver is for accessing the PSE (Programmable Service Engine),
+	  an Embedded Controller like IP, using ISHTP (Integrated Sensor Hub
+	  Transport Protocol) to get battery, thermal and UCSI (USB Type-C
+          Connector System Software Interface) related data from the platform.
+	  Users who don't want to use discrete Embedded Controller on Intel's
+	  Elkhartlake platform, can leverage this integrated solution of
+	  ECLite which is part of PSE subsystem.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called intel_ishtp_eclite
+
 config INTEL_MRFLD_PWRBTN
 	tristate "Intel Merrifield Basin Cove power button driver"
 	depends on INTEL_SOC_PMIC_MRFLD
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 7ee369aab10d..568c9c7d4173 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_INTEL_INT0002_VGPIO)	+= intel_int0002_vgpio.o
 obj-$(CONFIG_INTEL_MENLOW)		+= intel_menlow.o
 obj-$(CONFIG_INTEL_OAKTRAIL)		+= intel_oaktrail.o
 obj-$(CONFIG_INTEL_VBTN)		+= intel-vbtn.o
+obj-$(CONFIG_INTEL_ISHTP_ECLITE)	+= intel_ishtp_eclite.o
 
 # MSI
 obj-$(CONFIG_MSI_LAPTOP)	+= msi-laptop.o
diff --git a/drivers/platform/x86/intel_ishtp_eclite.c b/drivers/platform/x86/intel_ishtp_eclite.c
new file mode 100644
index 000000000000..d5611b1a13df
--- /dev/null
+++ b/drivers/platform/x86/intel_ishtp_eclite.c
@@ -0,0 +1,699 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel ECLite opregion driver for talking to ECLite firmware running on
+ * Intel Integrated Sensor Hub (ISH) using ISH Transport Protocol (ISHTP)
+ *
+ * Copyright (c) 2021, Intel Corporation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/intel-ish-client-if.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+#include <linux/types.h>
+#include <linux/uuid.h>
+#include <linux/uaccess.h>
+
+#define ECLITE_DATA_OPREGION_ID	0x9E
+#define ECLITE_CMD_OPREGION_ID	0x9F
+
+#define ECL_MSG_DATA	0x1
+#define ECL_MSG_EVENT	0x2
+
+#define ECL_ISH_READ	0x1
+#define ECL_ISH_WRITE	0x2
+#define ECL_ISH_HEADER_VERSION	0
+
+#define ECL_CL_RX_RING_SIZE	16
+#define ECL_CL_TX_RING_SIZE	8
+
+#define ECL_DATA_OPR_BUFLEN	384
+#define ECL_EVENTS_NOTIFY	333
+
+#define cmd_opr_offsetof(element)	offsetof(struct opregion_cmd, element)
+#define cl_data_to_dev(opr_dev)	ishtp_device((opr_dev)->cl_device)
+
+#ifndef BITS_TO_BYTES
+#define BITS_TO_BYTES(x) ((x) / 8)
+#endif
+
+struct opregion_cmd {
+	unsigned int command;
+	unsigned int offset;
+	unsigned int length;
+	unsigned int event_id;
+};
+
+struct opregion_data {
+	char data[ECL_DATA_OPR_BUFLEN];
+};
+
+struct opregion_context {
+	struct opregion_cmd cmd_area;
+	struct opregion_data data_area;
+};
+
+struct ecl_message_header {
+	unsigned int version:2;
+	unsigned int data_type:2;
+	unsigned int request_type:2;
+	unsigned int offset:9;
+	unsigned int data_len:9;
+	unsigned int event:8;
+};
+
+struct ecl_message {
+	struct ecl_message_header header;
+	char payload[ECL_DATA_OPR_BUFLEN];
+};
+
+struct ishtp_opregion_dev {
+	struct opregion_context opr_context;
+	struct ishtp_cl *ecl_ishtp_cl;
+	struct ishtp_cl_device *cl_device;
+	struct ishtp_fw_client *fw_client;
+	struct ishtp_cl_rb *rb;
+	struct acpi_device *adev;
+	unsigned int dsm_event_id;
+	unsigned int ish_link_ready;
+	unsigned int ish_read_done;
+	unsigned int acpi_init_done;
+	wait_queue_head_t read_wait;
+	struct work_struct event_work;
+	struct work_struct reset_work;
+	/* lock for opregion context */
+	struct mutex lock;
+
+};
+
+/* eclite ishtp client UUID: 6a19cc4b-d760-4de3-b14d-f25ebd0fbcd9 */
+static const guid_t ecl_ishtp_guid =
+	GUID_INIT(0x6a19cc4b, 0xd760, 0x4de3,
+		  0xb1, 0x4d, 0xf2, 0x5e, 0xbd, 0xf, 0xbc, 0xd9);
+
+/* ACPI DSM UUID: 91d936a7-1f01-49c6-a6b4-72f00ad8d8a5 */
+static const guid_t ecl_acpi_guid =
+	GUID_INIT(0x91d936a7, 0x1f01, 0x49c6, 0xa6,
+		  0xb4, 0x72, 0xf0, 0x0a, 0xd8, 0xd8, 0xa5);
+
+/**
+ * ecl_ish_cl_read() - Read data from eclite FW
+ *
+ * @opr_dev:  pointer to opregion device
+ *
+ * This function issues a read request to eclite FW and waits until it
+ * receives a response. When response is received the read data is copied to
+ * opregion buffer.
+ */
+static int ecl_ish_cl_read(struct ishtp_opregion_dev *opr_dev)
+{
+	struct ecl_message_header header;
+	int len, rv;
+
+	if (!opr_dev->ish_link_ready)
+		return -EIO;
+
+	if ((opr_dev->opr_context.cmd_area.offset +
+	     opr_dev->opr_context.cmd_area.length) > ECL_DATA_OPR_BUFLEN) {
+		return -EINVAL;
+	}
+
+	header.version = ECL_ISH_HEADER_VERSION;
+	header.data_type = ECL_MSG_DATA;
+	header.request_type = ECL_ISH_READ;
+	header.offset = opr_dev->opr_context.cmd_area.offset;
+	header.data_len = opr_dev->opr_context.cmd_area.length;
+	header.event = opr_dev->opr_context.cmd_area.event_id;
+	len = sizeof(header);
+
+	opr_dev->ish_read_done = false;
+	rv = ishtp_cl_send(opr_dev->ecl_ishtp_cl, (uint8_t *)&header, len);
+	if (rv) {
+		dev_err(cl_data_to_dev(opr_dev), "ish-read : send failed\n");
+		return -EIO;
+	}
+
+	dev_dbg(cl_data_to_dev(opr_dev),
+		"[ish_rd] Req: off : %x, len : %x\n",
+		header.offset,
+		header.data_len);
+
+	rv = wait_event_interruptible_timeout(opr_dev->read_wait,
+					      opr_dev->ish_read_done,
+					      2 * HZ);
+	if (!rv) {
+		dev_err(cl_data_to_dev(opr_dev),
+			"[ish_rd] No response from firmware\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ * ecl_ish_cl_write() - This function writes data to eclite FW.
+ *
+ * @opr_dev:  pointer to opregion device
+ *
+ * This function writes data to eclite FW.
+ */
+static int ecl_ish_cl_write(struct ishtp_opregion_dev *opr_dev)
+{
+	struct ecl_message message;
+	int len;
+
+	if (!opr_dev->ish_link_ready)
+		return -EIO;
+
+	if ((opr_dev->opr_context.cmd_area.offset +
+	     opr_dev->opr_context.cmd_area.length) > ECL_DATA_OPR_BUFLEN) {
+		return -EINVAL;
+	}
+
+	message.header.version = ECL_ISH_HEADER_VERSION;
+	message.header.data_type = ECL_MSG_DATA;
+	message.header.request_type = ECL_ISH_WRITE;
+	message.header.offset = opr_dev->opr_context.cmd_area.offset;
+	message.header.data_len = opr_dev->opr_context.cmd_area.length;
+	message.header.event = opr_dev->opr_context.cmd_area.event_id;
+	len = sizeof(struct ecl_message_header) + message.header.data_len;
+
+	memcpy(message.payload,
+	       opr_dev->opr_context.data_area.data + message.header.offset,
+	       message.header.data_len);
+
+	dev_dbg(cl_data_to_dev(opr_dev),
+		"[ish_wr] off : %x, len : %x\n",
+		message.header.offset,
+		message.header.data_len);
+
+	return ishtp_cl_send(opr_dev->ecl_ishtp_cl, (uint8_t *)&message, len);
+}
+
+static acpi_status
+ecl_opregion_cmd_handler(u32 function, acpi_physical_address address,
+			 u32 bits, u64 *value64,
+			 void *handler_context, void *region_context)
+{
+	struct ishtp_opregion_dev *opr_dev;
+	struct opregion_cmd *cmd;
+	acpi_status status = AE_OK;
+
+	if (!region_context || !value64)
+		return AE_BAD_PARAMETER;
+
+	if (function == ACPI_READ)
+		return AE_ERROR;
+
+	opr_dev = (struct ishtp_opregion_dev *)region_context;
+
+	mutex_lock(&opr_dev->lock);
+
+	cmd = &opr_dev->opr_context.cmd_area;
+
+	switch (address) {
+	case cmd_opr_offsetof(command):
+		cmd->command = (u32)*value64;
+
+		if (cmd->command == ECL_ISH_READ)
+			status =  ecl_ish_cl_read(opr_dev);
+		else if (cmd->command == ECL_ISH_WRITE)
+			status = ecl_ish_cl_write(opr_dev);
+		else
+			status = AE_ERROR;
+		break;
+	case cmd_opr_offsetof(offset):
+		cmd->offset = (u32)*value64;
+		break;
+	case cmd_opr_offsetof(length):
+		cmd->length = (u32)*value64;
+		break;
+	case cmd_opr_offsetof(event_id):
+		cmd->event_id = (u32)*value64;
+		break;
+	default:
+		status = AE_ERROR;
+	}
+
+	mutex_unlock(&opr_dev->lock);
+
+	return status;
+}
+
+static acpi_status
+ecl_opregion_data_handler(u32 function, acpi_physical_address address,
+			  u32 bits, u64 *value64,
+			  void *handler_context, void *region_context)
+{
+	struct ishtp_opregion_dev *opr_dev;
+	unsigned int bytes = BITS_TO_BYTES(bits);
+	void *data_addr;
+
+	if (!region_context || !value64)
+		return AE_BAD_PARAMETER;
+
+	if (address + bytes > ECL_DATA_OPR_BUFLEN)
+		return AE_BAD_PARAMETER;
+
+	opr_dev = (struct ishtp_opregion_dev *)region_context;
+
+	mutex_lock(&opr_dev->lock);
+
+	data_addr = &opr_dev->opr_context.data_area.data[address];
+
+	if (function == ACPI_READ) {
+		memcpy(value64, data_addr, bytes);
+	} else if (function == ACPI_WRITE) {
+		memcpy(data_addr, value64, bytes);
+	} else {
+		mutex_unlock(&opr_dev->lock);
+		return AE_BAD_PARAMETER;
+	}
+
+	mutex_unlock(&opr_dev->lock);
+
+	return AE_OK;
+}
+
+static int acpi_find_eclite_device(struct ishtp_opregion_dev *opr_dev)
+{
+	struct acpi_device *adev;
+
+	/* Find ECLite device and install opregion handlers */
+	adev = acpi_dev_get_first_match_dev("INTC1035", NULL, -1);
+	if (!adev) {
+		dev_err(cl_data_to_dev(opr_dev), "eclite ACPI device not found\n");
+		return -ENODEV;
+	}
+
+	opr_dev->adev = adev;
+	acpi_dev_put(adev);
+
+	return 0;
+}
+
+static int acpi_opregion_init(struct ishtp_opregion_dev *opr_dev)
+{
+	acpi_status status;
+
+	status = acpi_install_address_space_handler(opr_dev->adev->handle,
+						    ECLITE_CMD_OPREGION_ID,
+						    ecl_opregion_cmd_handler,
+						    NULL, opr_dev);
+	if (ACPI_FAILURE(status)) {
+		dev_err(cl_data_to_dev(opr_dev),
+			"cmd space handler install failed\n");
+		return -ENODEV;
+	}
+
+	status = acpi_install_address_space_handler(opr_dev->adev->handle,
+						    ECLITE_DATA_OPREGION_ID,
+						    ecl_opregion_data_handler,
+						    NULL, opr_dev);
+	if (ACPI_FAILURE(status)) {
+		dev_err(cl_data_to_dev(opr_dev),
+			"data space handler install failed\n");
+
+		acpi_remove_address_space_handler(opr_dev->adev->handle,
+						  ECLITE_CMD_OPREGION_ID,
+						  ecl_opregion_cmd_handler);
+		return -ENODEV;
+	}
+	opr_dev->acpi_init_done = true;
+
+	dev_dbg(cl_data_to_dev(opr_dev), "Opregion handlers are installed\n");
+
+	return 0;
+}
+
+static void acpi_opregion_deinit(struct ishtp_opregion_dev *opr_dev)
+{
+	acpi_remove_address_space_handler(opr_dev->adev->handle,
+					  ECLITE_CMD_OPREGION_ID,
+					  ecl_opregion_cmd_handler);
+
+	acpi_remove_address_space_handler(opr_dev->adev->handle,
+					  ECLITE_DATA_OPREGION_ID,
+					  ecl_opregion_data_handler);
+	opr_dev->acpi_init_done = false;
+}
+
+static void ecl_acpi_invoke_dsm(struct work_struct *work)
+{
+	struct ishtp_opregion_dev *opr_dev;
+	union acpi_object *obj;
+
+	opr_dev = container_of(work, struct ishtp_opregion_dev, event_work);
+	if (!opr_dev->acpi_init_done)
+		return;
+
+	obj = acpi_evaluate_dsm(opr_dev->adev->handle, &ecl_acpi_guid, 0,
+				opr_dev->dsm_event_id, NULL);
+	if (!obj) {
+		dev_warn(cl_data_to_dev(opr_dev), "_DSM fn call failed\n");
+		return;
+	}
+
+	dev_dbg(cl_data_to_dev(opr_dev), "Exec DSM function code: %d success\n",
+		opr_dev->dsm_event_id);
+
+	ACPI_FREE(obj);
+}
+
+static void ecl_ish_process_rx_data(struct ishtp_opregion_dev *opr_dev)
+{
+	struct ecl_message *message =
+		(struct ecl_message *)opr_dev->rb->buffer.data;
+
+	dev_dbg(cl_data_to_dev(opr_dev),
+		"[ish_rd] Resp: off : %x, len : %x\n",
+		message->header.offset,
+		message->header.data_len);
+
+	if ((message->header.offset + message->header.data_len) >
+			ECL_DATA_OPR_BUFLEN) {
+		return;
+	}
+
+	memcpy(opr_dev->opr_context.data_area.data + message->header.offset,
+	       message->payload, message->header.data_len);
+
+	opr_dev->ish_read_done = true;
+	wake_up_interruptible(&opr_dev->read_wait);
+}
+
+static void ecl_ish_process_rx_event(struct ishtp_opregion_dev *opr_dev)
+{
+	struct ecl_message_header *header =
+		(struct ecl_message_header *)opr_dev->rb->buffer.data;
+
+	dev_dbg(cl_data_to_dev(opr_dev),
+		"[ish_ev] Evt received: %8x\n", header->event);
+
+	opr_dev->dsm_event_id = header->event;
+	schedule_work(&opr_dev->event_work);
+}
+
+static int ecl_ish_cl_enable_events(struct ishtp_opregion_dev *opr_dev,
+				    bool config_enable)
+{
+	struct ecl_message message;
+	int len;
+
+	message.header.version = ECL_ISH_HEADER_VERSION;
+	message.header.data_type = ECL_MSG_DATA;
+	message.header.request_type = ECL_ISH_WRITE;
+	message.header.offset = ECL_EVENTS_NOTIFY;
+	message.header.data_len = 1;
+	message.payload[0] = config_enable;
+
+	len = sizeof(struct ecl_message_header) + message.header.data_len;
+
+	return ishtp_cl_send(opr_dev->ecl_ishtp_cl, (uint8_t *)&message, len);
+}
+
+static void ecl_ishtp_cl_event_cb(struct ishtp_cl_device *cl_device)
+{
+	struct ishtp_cl *ecl_ishtp_cl = ishtp_get_drvdata(cl_device);
+	struct ishtp_opregion_dev *opr_dev;
+	struct ecl_message_header *header;
+	struct ishtp_cl_rb *rb;
+
+	opr_dev = ishtp_get_client_data(ecl_ishtp_cl);
+	while ((rb = ishtp_cl_rx_get_rb(opr_dev->ecl_ishtp_cl)) != NULL) {
+		opr_dev->rb = rb;
+		header = (struct ecl_message_header *)rb->buffer.data;
+
+		if (header->data_type == ECL_MSG_DATA)
+			ecl_ish_process_rx_data(opr_dev);
+		else if (header->data_type == ECL_MSG_EVENT)
+			ecl_ish_process_rx_event(opr_dev);
+		else
+			/* Got an event with wrong data_type, ignore it */
+			dev_err(cl_data_to_dev(opr_dev),
+				"[ish_cb] Received wrong data_type\n");
+
+		ishtp_cl_io_rb_recycle(rb);
+	}
+}
+
+static int ecl_ishtp_cl_init(struct ishtp_cl *ecl_ishtp_cl)
+{
+	struct ishtp_opregion_dev *opr_dev =
+		ishtp_get_client_data(ecl_ishtp_cl);
+	struct ishtp_fw_client *fw_client;
+	struct ishtp_device *dev;
+	int rv;
+
+	rv = ishtp_cl_link(ecl_ishtp_cl);
+	if (rv) {
+		dev_err(cl_data_to_dev(opr_dev), "ishtp_cl_link failed\n");
+		return	rv;
+	}
+
+	dev = ishtp_get_ishtp_device(ecl_ishtp_cl);
+
+	/* Connect to FW client */
+	ishtp_set_tx_ring_size(ecl_ishtp_cl, ECL_CL_TX_RING_SIZE);
+	ishtp_set_rx_ring_size(ecl_ishtp_cl, ECL_CL_RX_RING_SIZE);
+
+	fw_client = ishtp_fw_cl_get_client(dev, &ecl_ishtp_guid);
+	if (!fw_client) {
+		dev_err(cl_data_to_dev(opr_dev), "fw client not found\n");
+		return -ENOENT;
+	}
+
+	ishtp_cl_set_fw_client_id(ecl_ishtp_cl,
+				  ishtp_get_fw_client_id(fw_client));
+
+	ishtp_set_connection_state(ecl_ishtp_cl, ISHTP_CL_CONNECTING);
+
+	rv = ishtp_cl_connect(ecl_ishtp_cl);
+	if (rv) {
+		dev_err(cl_data_to_dev(opr_dev), "client connect failed\n");
+
+		ishtp_cl_unlink(ecl_ishtp_cl);
+		return rv;
+	}
+
+	dev_dbg(cl_data_to_dev(opr_dev), "Host connected to fw client\n");
+
+	return 0;
+}
+
+static void ecl_ishtp_cl_deinit(struct ishtp_cl *ecl_ishtp_cl)
+{
+	ishtp_cl_unlink(ecl_ishtp_cl);
+	ishtp_cl_flush_queues(ecl_ishtp_cl);
+	ishtp_cl_free(ecl_ishtp_cl);
+}
+
+static void ecl_ishtp_cl_reset_handler(struct work_struct *work)
+{
+	struct ishtp_opregion_dev *opr_dev;
+	struct ishtp_cl_device *cl_device;
+	struct ishtp_cl *ecl_ishtp_cl;
+	int rv;
+	int retry;
+
+	opr_dev = container_of(work, struct ishtp_opregion_dev, reset_work);
+
+	opr_dev->ish_link_ready = false;
+
+	cl_device = opr_dev->cl_device;
+	ecl_ishtp_cl = opr_dev->ecl_ishtp_cl;
+
+	ecl_ishtp_cl_deinit(ecl_ishtp_cl);
+
+	ecl_ishtp_cl = ishtp_cl_allocate(cl_device);
+	if (!ecl_ishtp_cl)
+		return;
+
+	ishtp_set_drvdata(cl_device, ecl_ishtp_cl);
+	ishtp_set_client_data(ecl_ishtp_cl, opr_dev);
+
+	opr_dev->ecl_ishtp_cl = ecl_ishtp_cl;
+
+	for (retry = 0; retry < 3; ++retry) {
+		rv = ecl_ishtp_cl_init(ecl_ishtp_cl);
+		if (!rv)
+			break;
+	}
+	if (rv) {
+		ishtp_cl_free(ecl_ishtp_cl);
+		opr_dev->ecl_ishtp_cl = NULL;
+		dev_err(cl_data_to_dev(opr_dev),
+			"[ish_rst] Reset failed. Link not ready.\n");
+		return;
+	}
+
+	ishtp_register_event_cb(cl_device, ecl_ishtp_cl_event_cb);
+	dev_info(cl_data_to_dev(opr_dev),
+		 "[ish_rst] Reset Success. Link ready.\n");
+
+	opr_dev->ish_link_ready = true;
+
+	if (opr_dev->acpi_init_done)
+		return;
+
+	rv = acpi_opregion_init(opr_dev);
+	if (rv) {
+		dev_err(cl_data_to_dev(opr_dev),
+			"ACPI opregion init failed\n");
+	}
+}
+
+static int ecl_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
+{
+	struct ishtp_cl *ecl_ishtp_cl;
+	struct ishtp_opregion_dev *opr_dev;
+	int rv;
+
+	opr_dev = devm_kzalloc(ishtp_device(cl_device), sizeof(*opr_dev),
+			       GFP_KERNEL);
+	if (!opr_dev)
+		return -ENOMEM;
+
+	ecl_ishtp_cl = ishtp_cl_allocate(cl_device);
+	if (!ecl_ishtp_cl)
+		return -ENOMEM;
+
+	ishtp_set_drvdata(cl_device, ecl_ishtp_cl);
+	ishtp_set_client_data(ecl_ishtp_cl, opr_dev);
+	opr_dev->ecl_ishtp_cl = ecl_ishtp_cl;
+	opr_dev->cl_device = cl_device;
+
+	init_waitqueue_head(&opr_dev->read_wait);
+	INIT_WORK(&opr_dev->event_work, ecl_acpi_invoke_dsm);
+	INIT_WORK(&opr_dev->reset_work, ecl_ishtp_cl_reset_handler);
+
+	/* Initialize ish client device */
+	rv = ecl_ishtp_cl_init(ecl_ishtp_cl);
+	if (rv) {
+		dev_err(cl_data_to_dev(opr_dev), "Client init failed\n");
+		goto err_exit;
+	}
+
+	dev_dbg(cl_data_to_dev(opr_dev), "eclite-ishtp client initialised\n");
+
+	/* Register a handler for eclite fw events */
+	ishtp_register_event_cb(cl_device, ecl_ishtp_cl_event_cb);
+
+	opr_dev->ish_link_ready = true;
+	mutex_init(&opr_dev->lock);
+
+	/* Now find ACPI device and init opregion handlers */
+	rv = acpi_find_eclite_device(opr_dev);
+	if (rv) {
+		dev_err(cl_data_to_dev(opr_dev), "ECLite ACPI ID not found\n");
+		goto err_exit;
+	}
+	rv = acpi_opregion_init(opr_dev);
+	if (rv) {
+		dev_err(cl_data_to_dev(opr_dev), "ACPI opregion init failed\n");
+		goto err_exit;
+	}
+
+	/* Reprobe devices depending on ECLite - battery, fan, etc. */
+	acpi_dev_clear_dependencies(opr_dev->adev);
+
+	return 0;
+err_exit:
+	ishtp_set_connection_state(ecl_ishtp_cl, ISHTP_CL_DISCONNECTING);
+	ishtp_cl_disconnect(ecl_ishtp_cl);
+	ecl_ishtp_cl_deinit(ecl_ishtp_cl);
+
+	return rv;
+}
+
+static void ecl_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
+{
+	struct ishtp_cl *ecl_ishtp_cl = ishtp_get_drvdata(cl_device);
+	struct ishtp_opregion_dev *opr_dev =
+		ishtp_get_client_data(ecl_ishtp_cl);
+
+	if (opr_dev->acpi_init_done)
+		acpi_opregion_deinit(opr_dev);
+
+	cancel_work_sync(&opr_dev->reset_work);
+	cancel_work_sync(&opr_dev->event_work);
+
+	ishtp_set_connection_state(ecl_ishtp_cl, ISHTP_CL_DISCONNECTING);
+	ishtp_cl_disconnect(ecl_ishtp_cl);
+	ecl_ishtp_cl_deinit(ecl_ishtp_cl);
+}
+
+static int ecl_ishtp_cl_reset(struct ishtp_cl_device *cl_device)
+{
+	struct ishtp_cl *ecl_ishtp_cl = ishtp_get_drvdata(cl_device);
+	struct ishtp_opregion_dev *opr_dev =
+		ishtp_get_client_data(ecl_ishtp_cl);
+
+	schedule_work(&opr_dev->reset_work);
+
+	return 0;
+}
+
+static int ecl_ishtp_cl_suspend(struct device *device)
+{
+	struct ishtp_cl_device *cl_device = ishtp_dev_to_cl_device(device);
+	struct ishtp_cl *ecl_ishtp_cl = ishtp_get_drvdata(cl_device);
+	struct ishtp_opregion_dev *opr_dev =
+		ishtp_get_client_data(ecl_ishtp_cl);
+
+	if (acpi_target_system_state() == ACPI_STATE_S0)
+		return 0;
+
+	acpi_opregion_deinit(opr_dev);
+	ecl_ish_cl_enable_events(opr_dev, false);
+
+	return 0;
+}
+
+static int ecl_ishtp_cl_resume(struct device *device)
+{
+	/* A reset is expected to call after an Sx. At this point
+	 * we are not sure if the link is up or not to restore anything,
+	 * so do nothing in resume path
+	 */
+	return 0;
+}
+
+static const struct dev_pm_ops ecl_ishtp_pm_ops = {
+	.suspend = ecl_ishtp_cl_suspend,
+	.resume = ecl_ishtp_cl_resume,
+};
+
+static struct ishtp_cl_driver ecl_ishtp_cl_driver = {
+	.name = "ishtp-eclite",
+	.guid = &ecl_ishtp_guid,
+	.probe = ecl_ishtp_cl_probe,
+	.remove = ecl_ishtp_cl_remove,
+	.reset = ecl_ishtp_cl_reset,
+	.driver.pm = &ecl_ishtp_pm_ops,
+};
+
+static int __init ecl_ishtp_init(void)
+{
+	return ishtp_cl_driver_register(&ecl_ishtp_cl_driver, THIS_MODULE);
+}
+
+static void __exit ecl_ishtp_exit(void)
+{
+	return ishtp_cl_driver_unregister(&ecl_ishtp_cl_driver);
+}
+
+late_initcall(ecl_ishtp_init);
+module_exit(ecl_ishtp_exit);
+
+MODULE_DESCRIPTION("ISH ISHTP eclite client opregion driver");
+MODULE_AUTHOR("K Naduvalath, Sumesh <sumesh.k.naduvalath@...el.com>");
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("ishtp:*");
-- 
2.31.1

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