![Rushikesh S Kadam](/assets/img/avatar_default.png)
This driver implements a slim layer to enable the ChromeOS EC kernel stack (cros_ec) to communicate with ChromeOS EC firmware running on the Intel Integrated Sensor Hub (ISH). The driver registers a ChromeOS EC MFD device to connect with cros_ec kernel stack (upper layer), and it registers a client with the ISH Transport Protocol bus (lower layer) to talk with the ISH firwmare. See description of the ISHTP protocol at Documentation/hid/intel-ish-hid.txt Signed-off-by: Rushikesh S Kadam <rushikesh.s.kadam@intel.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Jett Rink <jettrink@chromium.org> Tested-by: Jett Rink <jettrink@chromium.org> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
764 lines
20 KiB
C
764 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// ISHTP interface for ChromeOS Embedded Controller
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//
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// Copyright (c) 2019, Intel Corporation.
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//
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// ISHTP client driver for talking to the Chrome OS EC firmware running
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// on Intel Integrated Sensor Hub (ISH) using the ISH Transport protocol
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// (ISH-TP).
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#include <linux/delay.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/cros_ec.h>
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#include <linux/mfd/cros_ec_commands.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/intel-ish-client-if.h>
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/*
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* ISH TX/RX ring buffer pool size
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*
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* The AP->ISH messages and corresponding ISH->AP responses are
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* serialized. We need 1 TX and 1 RX buffer for these.
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*
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* The MKBP ISH->AP events are serialized. We need one additional RX
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* buffer for them.
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*/
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#define CROS_ISH_CL_TX_RING_SIZE 8
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#define CROS_ISH_CL_RX_RING_SIZE 8
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/* ISH CrOS EC Host Commands */
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enum cros_ec_ish_channel {
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CROS_EC_COMMAND = 1, /* AP->ISH message */
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CROS_MKBP_EVENT = 2, /* ISH->AP events */
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};
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/*
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* ISH firmware timeout for 1 message send failure is 1Hz, and the
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* firmware will retry 2 times, so 3Hz is used for timeout.
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*/
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#define ISHTP_SEND_TIMEOUT (3 * HZ)
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/* ISH Transport CrOS EC ISH client unique GUID */
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static const guid_t cros_ish_guid =
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GUID_INIT(0x7b7154d0, 0x56f4, 0x4bdc,
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0xb0, 0xd8, 0x9e, 0x7c, 0xda, 0xe0, 0xd6, 0xa0);
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struct header {
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u8 channel;
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u8 status;
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u8 reserved[2];
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} __packed;
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struct cros_ish_out_msg {
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struct header hdr;
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struct ec_host_request ec_request;
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} __packed;
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struct cros_ish_in_msg {
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struct header hdr;
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struct ec_host_response ec_response;
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} __packed;
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#define IN_MSG_EC_RESPONSE_PREAMBLE \
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offsetof(struct cros_ish_in_msg, ec_response)
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#define OUT_MSG_EC_REQUEST_PREAMBLE \
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offsetof(struct cros_ish_out_msg, ec_request)
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#define cl_data_to_dev(client_data) ishtp_device((client_data)->cl_device)
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/*
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* The Read-Write Semaphore is used to prevent message TX or RX while
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* the ishtp client is being initialized or undergoing reset.
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*
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* The readers are the kernel function calls responsible for IA->ISH
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* and ISH->AP messaging.
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*
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* The writers are .reset() and .probe() function.
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*/
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DECLARE_RWSEM(init_lock);
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/**
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* struct response_info - Encapsulate firmware response related
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* information for passing between function ish_send() and
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* process_recv() callback.
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*
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* @data: Copy the data received from firmware here.
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* @max_size: Max size allocated for the @data buffer. If the received
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* data exceeds this value, we log an error.
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* @size: Actual size of data received from firmware.
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* @error: 0 for success, negative error code for a failure in process_recv().
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* @received: Set to true on receiving a valid firmware response to host command
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* @wait_queue: Wait queue for host to wait for firmware response.
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*/
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struct response_info {
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void *data;
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size_t max_size;
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size_t size;
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int error;
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bool received;
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wait_queue_head_t wait_queue;
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};
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/**
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* struct ishtp_cl_data - Encapsulate per ISH TP Client.
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*
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* @cros_ish_cl: ISHTP firmware client instance.
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* @cl_device: ISHTP client device instance.
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* @response: Response info passing between ish_send() and process_recv().
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* @work_ishtp_reset: Work queue reset handling.
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* @work_ec_evt: Work queue for EC events.
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* @ec_dev: CrOS EC MFD device.
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*
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* This structure is used to store per client data.
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*/
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struct ishtp_cl_data {
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struct ishtp_cl *cros_ish_cl;
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struct ishtp_cl_device *cl_device;
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/*
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* Used for passing firmware response information between
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* ish_send() and process_recv() callback.
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*/
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struct response_info response;
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struct work_struct work_ishtp_reset;
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struct work_struct work_ec_evt;
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struct cros_ec_device *ec_dev;
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};
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/**
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* ish_evt_handler - ISH to AP event handler
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* @work: Work struct
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*/
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static void ish_evt_handler(struct work_struct *work)
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{
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struct ishtp_cl_data *client_data =
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container_of(work, struct ishtp_cl_data, work_ec_evt);
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struct cros_ec_device *ec_dev = client_data->ec_dev;
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if (cros_ec_get_next_event(ec_dev, NULL) > 0) {
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blocking_notifier_call_chain(&ec_dev->event_notifier,
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0, ec_dev);
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}
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}
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/**
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* ish_send() - Send message from host to firmware
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*
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* @client_data: Client data instance
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* @out_msg: Message buffer to be sent to firmware
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* @out_size: Size of out going message
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* @in_msg: Message buffer where the incoming data is copied. This buffer
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* is allocated by calling
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* @in_size: Max size of incoming message
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*
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* Return: Number of bytes copied in the in_msg on success, negative
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* error code on failure.
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*/
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static int ish_send(struct ishtp_cl_data *client_data,
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u8 *out_msg, size_t out_size,
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u8 *in_msg, size_t in_size)
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{
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int rv;
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struct header *out_hdr = (struct header *)out_msg;
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struct ishtp_cl *cros_ish_cl = client_data->cros_ish_cl;
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dev_dbg(cl_data_to_dev(client_data),
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"%s: channel=%02u status=%02u\n",
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__func__, out_hdr->channel, out_hdr->status);
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/* Setup for incoming response */
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client_data->response.data = in_msg;
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client_data->response.max_size = in_size;
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client_data->response.error = 0;
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client_data->response.received = false;
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rv = ishtp_cl_send(cros_ish_cl, out_msg, out_size);
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if (rv) {
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dev_err(cl_data_to_dev(client_data),
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"ishtp_cl_send error %d\n", rv);
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return rv;
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}
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wait_event_interruptible_timeout(client_data->response.wait_queue,
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client_data->response.received,
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ISHTP_SEND_TIMEOUT);
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if (!client_data->response.received) {
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dev_err(cl_data_to_dev(client_data),
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"Timed out for response to host message\n");
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return -ETIMEDOUT;
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}
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if (client_data->response.error < 0)
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return client_data->response.error;
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return client_data->response.size;
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}
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/**
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* process_recv() - Received and parse incoming packet
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* @cros_ish_cl: Client instance to get stats
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* @rb_in_proc: Host interface message buffer
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*
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* Parse the incoming packet. If it is a response packet then it will
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* update per instance flags and wake up the caller waiting to for the
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* response. If it is an event packet then it will schedule event work.
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*/
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static void process_recv(struct ishtp_cl *cros_ish_cl,
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struct ishtp_cl_rb *rb_in_proc)
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{
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size_t data_len = rb_in_proc->buf_idx;
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struct ishtp_cl_data *client_data =
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ishtp_get_client_data(cros_ish_cl);
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struct device *dev = cl_data_to_dev(client_data);
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struct cros_ish_in_msg *in_msg =
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(struct cros_ish_in_msg *)rb_in_proc->buffer.data;
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/* Proceed only if reset or init is not in progress */
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if (!down_read_trylock(&init_lock)) {
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/* Free the buffer */
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ishtp_cl_io_rb_recycle(rb_in_proc);
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dev_warn(dev,
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"Host is not ready to receive incoming messages\n");
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return;
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}
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/*
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* All firmware messages contain a header. Check the buffer size
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* before accessing elements inside.
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*/
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if (!rb_in_proc->buffer.data) {
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dev_warn(dev, "rb_in_proc->buffer.data returned null");
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client_data->response.error = -EBADMSG;
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goto end_error;
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}
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if (data_len < sizeof(struct header)) {
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dev_err(dev, "data size %zu is less than header %zu\n",
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data_len, sizeof(struct header));
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client_data->response.error = -EMSGSIZE;
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goto end_error;
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}
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dev_dbg(dev, "channel=%02u status=%02u\n",
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in_msg->hdr.channel, in_msg->hdr.status);
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switch (in_msg->hdr.channel) {
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case CROS_EC_COMMAND:
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/* Sanity check */
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if (!client_data->response.data) {
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dev_err(dev,
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"Receiving buffer is null. Should be allocated by calling function\n");
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client_data->response.error = -EINVAL;
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goto error_wake_up;
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}
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if (client_data->response.received) {
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dev_err(dev,
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"Previous firmware message not yet processed\n");
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client_data->response.error = -EINVAL;
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goto error_wake_up;
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}
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if (data_len > client_data->response.max_size) {
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dev_err(dev,
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"Received buffer size %zu is larger than allocated buffer %zu\n",
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data_len, client_data->response.max_size);
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client_data->response.error = -EMSGSIZE;
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goto error_wake_up;
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}
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if (in_msg->hdr.status) {
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dev_err(dev, "firmware returned status %d\n",
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in_msg->hdr.status);
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client_data->response.error = -EIO;
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goto error_wake_up;
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}
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/* Update the actual received buffer size */
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client_data->response.size = data_len;
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/*
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* Copy the buffer received in firmware response for the
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* calling thread.
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*/
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memcpy(client_data->response.data,
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rb_in_proc->buffer.data, data_len);
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/* Set flag before waking up the caller */
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client_data->response.received = true;
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error_wake_up:
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/* Wake the calling thread */
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wake_up_interruptible(&client_data->response.wait_queue);
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break;
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case CROS_MKBP_EVENT:
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/* The event system doesn't send any data in buffer */
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schedule_work(&client_data->work_ec_evt);
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break;
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default:
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dev_err(dev, "Invalid channel=%02d\n", in_msg->hdr.channel);
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}
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end_error:
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/* Free the buffer */
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ishtp_cl_io_rb_recycle(rb_in_proc);
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up_read(&init_lock);
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}
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/**
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* ish_event_cb() - bus driver callback for incoming message
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* @cl_device: ISHTP client device for which this message is targeted.
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*
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* Remove the packet from the list and process the message by calling
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* process_recv.
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*/
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static void ish_event_cb(struct ishtp_cl_device *cl_device)
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{
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struct ishtp_cl_rb *rb_in_proc;
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struct ishtp_cl *cros_ish_cl = ishtp_get_drvdata(cl_device);
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while ((rb_in_proc = ishtp_cl_rx_get_rb(cros_ish_cl)) != NULL) {
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/* Decide what to do with received data */
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process_recv(cros_ish_cl, rb_in_proc);
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}
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}
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/**
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* cros_ish_init() - Init function for ISHTP client
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* @cros_ish_cl: ISHTP client instance
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*
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* This function complete the initializtion of the client.
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*
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* Return: 0 for success, negative error code for failure.
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*/
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static int cros_ish_init(struct ishtp_cl *cros_ish_cl)
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{
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int rv;
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struct ishtp_device *dev;
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struct ishtp_fw_client *fw_client;
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struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl);
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rv = ishtp_cl_link(cros_ish_cl);
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if (rv) {
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dev_err(cl_data_to_dev(client_data),
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"ishtp_cl_link failed\n");
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return rv;
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}
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dev = ishtp_get_ishtp_device(cros_ish_cl);
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/* Connect to firmware client */
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ishtp_set_tx_ring_size(cros_ish_cl, CROS_ISH_CL_TX_RING_SIZE);
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ishtp_set_rx_ring_size(cros_ish_cl, CROS_ISH_CL_RX_RING_SIZE);
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fw_client = ishtp_fw_cl_get_client(dev, &cros_ish_guid);
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if (!fw_client) {
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dev_err(cl_data_to_dev(client_data),
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"ish client uuid not found\n");
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rv = -ENOENT;
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goto err_cl_unlink;
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}
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ishtp_cl_set_fw_client_id(cros_ish_cl,
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ishtp_get_fw_client_id(fw_client));
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ishtp_set_connection_state(cros_ish_cl, ISHTP_CL_CONNECTING);
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rv = ishtp_cl_connect(cros_ish_cl);
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if (rv) {
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dev_err(cl_data_to_dev(client_data),
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"client connect fail\n");
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goto err_cl_unlink;
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}
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ishtp_register_event_cb(client_data->cl_device, ish_event_cb);
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return 0;
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err_cl_unlink:
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ishtp_cl_unlink(cros_ish_cl);
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return rv;
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}
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/**
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* cros_ish_deinit() - Deinit function for ISHTP client
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* @cros_ish_cl: ISHTP client instance
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*
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* Unlink and free cros_ec client
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*/
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static void cros_ish_deinit(struct ishtp_cl *cros_ish_cl)
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{
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ishtp_set_connection_state(cros_ish_cl, ISHTP_CL_DISCONNECTING);
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ishtp_cl_disconnect(cros_ish_cl);
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ishtp_cl_unlink(cros_ish_cl);
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ishtp_cl_flush_queues(cros_ish_cl);
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/* Disband and free all Tx and Rx client-level rings */
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ishtp_cl_free(cros_ish_cl);
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}
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/**
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* prepare_cros_ec_rx() - Check & prepare receive buffer
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* @ec_dev: CrOS EC MFD device.
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* @in_msg: Incoming message buffer
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* @msg: cros_ec command used to send & receive data
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*
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* Return: 0 for success, negative error code for failure.
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*
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* Check the received buffer. Convert to cros_ec_command format.
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*/
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static int prepare_cros_ec_rx(struct cros_ec_device *ec_dev,
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const struct cros_ish_in_msg *in_msg,
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struct cros_ec_command *msg)
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{
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u8 sum = 0;
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int i, rv, offset;
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/* Check response error code */
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msg->result = in_msg->ec_response.result;
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rv = cros_ec_check_result(ec_dev, msg);
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if (rv < 0)
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return rv;
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if (in_msg->ec_response.data_len > msg->insize) {
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dev_err(ec_dev->dev, "Packet too long (%d bytes, expected %d)",
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in_msg->ec_response.data_len, msg->insize);
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return -ENOSPC;
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}
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|
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/* Copy response packet payload and compute checksum */
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for (i = 0; i < sizeof(struct ec_host_response); i++)
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sum += ((u8 *)in_msg)[IN_MSG_EC_RESPONSE_PREAMBLE + i];
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offset = sizeof(struct cros_ish_in_msg);
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for (i = 0; i < in_msg->ec_response.data_len; i++)
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sum += msg->data[i] = ((u8 *)in_msg)[offset + i];
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if (sum) {
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dev_dbg(ec_dev->dev, "Bad received packet checksum %d\n", sum);
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return -EBADMSG;
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}
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return 0;
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}
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|
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static int cros_ec_pkt_xfer_ish(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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int rv;
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struct ishtp_cl *cros_ish_cl = ec_dev->priv;
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struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl);
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struct device *dev = cl_data_to_dev(client_data);
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struct cros_ish_in_msg *in_msg = (struct cros_ish_in_msg *)ec_dev->din;
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struct cros_ish_out_msg *out_msg =
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(struct cros_ish_out_msg *)ec_dev->dout;
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size_t in_size = sizeof(struct cros_ish_in_msg) + msg->insize;
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size_t out_size = sizeof(struct cros_ish_out_msg) + msg->outsize;
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/* Sanity checks */
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if (in_size > ec_dev->din_size) {
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dev_err(dev,
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"Incoming payload size %zu is too large for ec_dev->din_size %d\n",
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in_size, ec_dev->din_size);
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return -EMSGSIZE;
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}
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if (out_size > ec_dev->dout_size) {
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dev_err(dev,
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"Outgoing payload size %zu is too large for ec_dev->dout_size %d\n",
|
|
out_size, ec_dev->dout_size);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* Proceed only if reset-init is not in progress */
|
|
if (!down_read_trylock(&init_lock)) {
|
|
dev_warn(dev,
|
|
"Host is not ready to send messages to ISH. Try again\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* Prepare the package to be sent over ISH TP */
|
|
out_msg->hdr.channel = CROS_EC_COMMAND;
|
|
out_msg->hdr.status = 0;
|
|
|
|
ec_dev->dout += OUT_MSG_EC_REQUEST_PREAMBLE;
|
|
cros_ec_prepare_tx(ec_dev, msg);
|
|
ec_dev->dout -= OUT_MSG_EC_REQUEST_PREAMBLE;
|
|
|
|
dev_dbg(dev,
|
|
"out_msg: struct_ver=0x%x checksum=0x%x command=0x%x command_ver=0x%x data_len=0x%x\n",
|
|
out_msg->ec_request.struct_version,
|
|
out_msg->ec_request.checksum,
|
|
out_msg->ec_request.command,
|
|
out_msg->ec_request.command_version,
|
|
out_msg->ec_request.data_len);
|
|
|
|
/* Send command to ISH EC firmware and read response */
|
|
rv = ish_send(client_data,
|
|
(u8 *)out_msg, out_size,
|
|
(u8 *)in_msg, in_size);
|
|
if (rv < 0)
|
|
goto end_error;
|
|
|
|
rv = prepare_cros_ec_rx(ec_dev, in_msg, msg);
|
|
if (rv)
|
|
goto end_error;
|
|
|
|
rv = in_msg->ec_response.data_len;
|
|
|
|
dev_dbg(dev,
|
|
"in_msg: struct_ver=0x%x checksum=0x%x result=0x%x data_len=0x%x\n",
|
|
in_msg->ec_response.struct_version,
|
|
in_msg->ec_response.checksum,
|
|
in_msg->ec_response.result,
|
|
in_msg->ec_response.data_len);
|
|
|
|
end_error:
|
|
if (msg->command == EC_CMD_REBOOT_EC)
|
|
msleep(EC_REBOOT_DELAY_MS);
|
|
|
|
up_read(&init_lock);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int cros_ec_dev_init(struct ishtp_cl_data *client_data)
|
|
{
|
|
struct cros_ec_device *ec_dev;
|
|
struct device *dev = cl_data_to_dev(client_data);
|
|
|
|
ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL);
|
|
if (!ec_dev)
|
|
return -ENOMEM;
|
|
|
|
client_data->ec_dev = ec_dev;
|
|
dev->driver_data = ec_dev;
|
|
|
|
ec_dev->dev = dev;
|
|
ec_dev->priv = client_data->cros_ish_cl;
|
|
ec_dev->cmd_xfer = NULL;
|
|
ec_dev->pkt_xfer = cros_ec_pkt_xfer_ish;
|
|
ec_dev->phys_name = dev_name(dev);
|
|
ec_dev->din_size = sizeof(struct cros_ish_in_msg) +
|
|
sizeof(struct ec_response_get_protocol_info);
|
|
ec_dev->dout_size = sizeof(struct cros_ish_out_msg);
|
|
|
|
return cros_ec_register(ec_dev);
|
|
}
|
|
|
|
static void reset_handler(struct work_struct *work)
|
|
{
|
|
int rv;
|
|
struct device *dev;
|
|
struct ishtp_cl *cros_ish_cl;
|
|
struct ishtp_cl_device *cl_device;
|
|
struct ishtp_cl_data *client_data =
|
|
container_of(work, struct ishtp_cl_data, work_ishtp_reset);
|
|
|
|
/* Lock for reset to complete */
|
|
down_write(&init_lock);
|
|
|
|
cros_ish_cl = client_data->cros_ish_cl;
|
|
cl_device = client_data->cl_device;
|
|
|
|
/* Unlink, flush queues & start again */
|
|
ishtp_cl_unlink(cros_ish_cl);
|
|
ishtp_cl_flush_queues(cros_ish_cl);
|
|
ishtp_cl_free(cros_ish_cl);
|
|
|
|
cros_ish_cl = ishtp_cl_allocate(cl_device);
|
|
if (!cros_ish_cl) {
|
|
up_write(&init_lock);
|
|
return;
|
|
}
|
|
|
|
ishtp_set_drvdata(cl_device, cros_ish_cl);
|
|
ishtp_set_client_data(cros_ish_cl, client_data);
|
|
client_data->cros_ish_cl = cros_ish_cl;
|
|
|
|
rv = cros_ish_init(cros_ish_cl);
|
|
if (rv) {
|
|
ishtp_cl_free(cros_ish_cl);
|
|
dev_err(cl_data_to_dev(client_data), "Reset Failed\n");
|
|
up_write(&init_lock);
|
|
return;
|
|
}
|
|
|
|
/* Refresh ec_dev device pointers */
|
|
client_data->ec_dev->priv = client_data->cros_ish_cl;
|
|
dev = cl_data_to_dev(client_data);
|
|
dev->driver_data = client_data->ec_dev;
|
|
|
|
dev_info(cl_data_to_dev(client_data), "Chrome EC ISH reset done\n");
|
|
|
|
up_write(&init_lock);
|
|
}
|
|
|
|
/**
|
|
* cros_ec_ishtp_probe() - ISHTP client driver probe callback
|
|
* @cl_device: ISHTP client device instance
|
|
*
|
|
* Return: 0 for success, negative error code for failure.
|
|
*/
|
|
static int cros_ec_ishtp_probe(struct ishtp_cl_device *cl_device)
|
|
{
|
|
int rv;
|
|
struct ishtp_cl *cros_ish_cl;
|
|
struct ishtp_cl_data *client_data =
|
|
devm_kzalloc(ishtp_device(cl_device),
|
|
sizeof(*client_data), GFP_KERNEL);
|
|
if (!client_data)
|
|
return -ENOMEM;
|
|
|
|
/* Lock for initialization to complete */
|
|
down_write(&init_lock);
|
|
|
|
cros_ish_cl = ishtp_cl_allocate(cl_device);
|
|
if (!cros_ish_cl) {
|
|
rv = -ENOMEM;
|
|
goto end_ishtp_cl_alloc_error;
|
|
}
|
|
|
|
ishtp_set_drvdata(cl_device, cros_ish_cl);
|
|
ishtp_set_client_data(cros_ish_cl, client_data);
|
|
client_data->cros_ish_cl = cros_ish_cl;
|
|
client_data->cl_device = cl_device;
|
|
|
|
init_waitqueue_head(&client_data->response.wait_queue);
|
|
|
|
INIT_WORK(&client_data->work_ishtp_reset,
|
|
reset_handler);
|
|
INIT_WORK(&client_data->work_ec_evt,
|
|
ish_evt_handler);
|
|
|
|
rv = cros_ish_init(cros_ish_cl);
|
|
if (rv)
|
|
goto end_ishtp_cl_init_error;
|
|
|
|
ishtp_get_device(cl_device);
|
|
|
|
up_write(&init_lock);
|
|
|
|
/* Register croc_ec_dev mfd */
|
|
rv = cros_ec_dev_init(client_data);
|
|
if (rv)
|
|
goto end_cros_ec_dev_init_error;
|
|
|
|
return 0;
|
|
|
|
end_cros_ec_dev_init_error:
|
|
ishtp_set_connection_state(cros_ish_cl, ISHTP_CL_DISCONNECTING);
|
|
ishtp_cl_disconnect(cros_ish_cl);
|
|
ishtp_cl_unlink(cros_ish_cl);
|
|
ishtp_cl_flush_queues(cros_ish_cl);
|
|
ishtp_put_device(cl_device);
|
|
end_ishtp_cl_init_error:
|
|
ishtp_cl_free(cros_ish_cl);
|
|
end_ishtp_cl_alloc_error:
|
|
up_write(&init_lock);
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* cros_ec_ishtp_remove() - ISHTP client driver remove callback
|
|
* @cl_device: ISHTP client device instance
|
|
*
|
|
* Return: 0
|
|
*/
|
|
static int cros_ec_ishtp_remove(struct ishtp_cl_device *cl_device)
|
|
{
|
|
struct ishtp_cl *cros_ish_cl = ishtp_get_drvdata(cl_device);
|
|
struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl);
|
|
|
|
cancel_work_sync(&client_data->work_ishtp_reset);
|
|
cancel_work_sync(&client_data->work_ec_evt);
|
|
cros_ish_deinit(cros_ish_cl);
|
|
ishtp_put_device(cl_device);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cros_ec_ishtp_reset() - ISHTP client driver reset callback
|
|
* @cl_device: ISHTP client device instance
|
|
*
|
|
* Return: 0
|
|
*/
|
|
static int cros_ec_ishtp_reset(struct ishtp_cl_device *cl_device)
|
|
{
|
|
struct ishtp_cl *cros_ish_cl = ishtp_get_drvdata(cl_device);
|
|
struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl);
|
|
|
|
schedule_work(&client_data->work_ishtp_reset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cros_ec_ishtp_suspend() - ISHTP client driver suspend callback
|
|
* @device: device instance
|
|
*
|
|
* Return: 0 for success, negative error code for failure.
|
|
*/
|
|
static int __maybe_unused cros_ec_ishtp_suspend(struct device *device)
|
|
{
|
|
struct ishtp_cl_device *cl_device = dev_get_drvdata(device);
|
|
struct ishtp_cl *cros_ish_cl = ishtp_get_drvdata(cl_device);
|
|
struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl);
|
|
|
|
return cros_ec_suspend(client_data->ec_dev);
|
|
}
|
|
|
|
/**
|
|
* cros_ec_ishtp_resume() - ISHTP client driver resume callback
|
|
* @device: device instance
|
|
*
|
|
* Return: 0 for success, negative error code for failure.
|
|
*/
|
|
static int __maybe_unused cros_ec_ishtp_resume(struct device *device)
|
|
{
|
|
struct ishtp_cl_device *cl_device = dev_get_drvdata(device);
|
|
struct ishtp_cl *cros_ish_cl = ishtp_get_drvdata(cl_device);
|
|
struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl);
|
|
|
|
return cros_ec_resume(client_data->ec_dev);
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(cros_ec_ishtp_pm_ops, cros_ec_ishtp_suspend,
|
|
cros_ec_ishtp_resume);
|
|
|
|
static struct ishtp_cl_driver cros_ec_ishtp_driver = {
|
|
.name = "cros_ec_ishtp",
|
|
.guid = &cros_ish_guid,
|
|
.probe = cros_ec_ishtp_probe,
|
|
.remove = cros_ec_ishtp_remove,
|
|
.reset = cros_ec_ishtp_reset,
|
|
.driver = {
|
|
.pm = &cros_ec_ishtp_pm_ops,
|
|
},
|
|
};
|
|
|
|
static int __init cros_ec_ishtp_mod_init(void)
|
|
{
|
|
return ishtp_cl_driver_register(&cros_ec_ishtp_driver, THIS_MODULE);
|
|
}
|
|
|
|
static void __exit cros_ec_ishtp_mod_exit(void)
|
|
{
|
|
ishtp_cl_driver_unregister(&cros_ec_ishtp_driver);
|
|
}
|
|
|
|
module_init(cros_ec_ishtp_mod_init);
|
|
module_exit(cros_ec_ishtp_mod_exit);
|
|
|
|
MODULE_DESCRIPTION("ChromeOS EC ISHTP Client Driver");
|
|
MODULE_AUTHOR("Rushikesh S Kadam <rushikesh.s.kadam@intel.com>");
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("ishtp:*");
|