[PATCH v2 1/1] ishtp: Add support for Intel ishtp eclite driver
From: sumesh . k . naduvalath
Date: Thu Jul 08 2021 - 07:18:50 EST
From: "K Naduvalath, Sumesh" <sumesh.k.naduvalath@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Mark Gross <mgross@xxxxxxxxxxxxxxx>
---
Changes:
v2:
-Decoupled ACPI device search with acpi_find_device and cache acpi_handler
-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
-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 | 703 ++++++++++++++++++++++
4 files changed, 726 insertions(+)
create mode 100644 drivers/platform/x86/intel_ishtp_eclite.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 3298f4592ce7..d2bdb20c416f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9361,6 +9361,12 @@ L: linux-crypto@xxxxxxxxxxxxxxx
S: Maintained
F: drivers/crypto/ixp4xx_crypto.c
+INTEL ISHTP ECLITE DRIVER
+M: Sumesh K Naduvalath <sumesh.k.naduvalath@xxxxxxxxx>
+L: platform-driver-x86@xxxxxxxxxxxxxxx
+S: Supported
+F: drivers/platform/x86/intel_ishtp_eclite.c
+
INTEL IXP4XX QMGR, NPE, ETHERNET and HSS SUPPORT
M: Krzysztof Halasa <khalasa@xxxxxxx>
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..8e7c390f5116
--- /dev/null
+++ b/drivers/platform/x86/intel_ishtp_eclite.c
@@ -0,0 +1,703 @@
+// 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_handle *acpi_handle;
+ 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->acpi_handle = adev->handle;
+ 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->acpi_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->acpi_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->acpi_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->acpi_handle,
+ ECLITE_CMD_OPREGION_ID,
+ ecl_opregion_cmd_handler);
+
+ acpi_remove_address_space_handler(opr_dev->acpi_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->acpi_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_walk_dep_device_list(opr_dev->acpi_handle);
+
+ 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 int 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);
+
+ return 0;
+}
+
+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@xxxxxxxxx>");
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("ishtp:*");
--
2.31.1