From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/platform/chrome/cros_ec_ishtp.c | 798 ++++++++++++++++++++++++++++++++ 1 file changed, 798 insertions(+) create mode 100644 drivers/platform/chrome/cros_ec_ishtp.c (limited to 'drivers/platform/chrome/cros_ec_ishtp.c') diff --git a/drivers/platform/chrome/cros_ec_ishtp.c b/drivers/platform/chrome/cros_ec_ishtp.c new file mode 100644 index 000000000..cb2031cf7 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_ishtp.c @@ -0,0 +1,798 @@ +// SPDX-License-Identifier: GPL-2.0 +// ISHTP interface for ChromeOS Embedded Controller +// +// Copyright (c) 2019, Intel Corporation. +// +// ISHTP client driver for talking to the Chrome OS EC firmware running +// on Intel Integrated Sensor Hub (ISH) using the ISH Transport protocol +// (ISH-TP). + +#include +#include +#include +#include +#include +#include + +#include "cros_ec.h" + +/* + * ISH TX/RX ring buffer pool size + * + * The AP->ISH messages and corresponding ISH->AP responses are + * serialized. We need 1 TX and 1 RX buffer for these. + * + * The MKBP ISH->AP events are serialized. We need one additional RX + * buffer for them. + */ +#define CROS_ISH_CL_TX_RING_SIZE 8 +#define CROS_ISH_CL_RX_RING_SIZE 8 + +/* ISH CrOS EC Host Commands */ +enum cros_ec_ish_channel { + CROS_EC_COMMAND = 1, /* AP->ISH message */ + CROS_MKBP_EVENT = 2, /* ISH->AP events */ +}; + +/* + * ISH firmware timeout for 1 message send failure is 1Hz, and the + * firmware will retry 2 times, so 3Hz is used for timeout. + */ +#define ISHTP_SEND_TIMEOUT (3 * HZ) + +/* ISH Transport CrOS EC ISH client unique GUID */ +static const struct ishtp_device_id cros_ec_ishtp_id_table[] = { + { .guid = GUID_INIT(0x7b7154d0, 0x56f4, 0x4bdc, + 0xb0, 0xd8, 0x9e, 0x7c, 0xda, 0xe0, 0xd6, 0xa0), }, + { } +}; +MODULE_DEVICE_TABLE(ishtp, cros_ec_ishtp_id_table); + +struct header { + u8 channel; + u8 status; + u8 token; + u8 reserved; +} __packed; + +struct cros_ish_out_msg { + struct header hdr; + struct ec_host_request ec_request; +} __packed; + +struct cros_ish_in_msg { + struct header hdr; + struct ec_host_response ec_response; +} __packed; + +#define IN_MSG_EC_RESPONSE_PREAMBLE \ + offsetof(struct cros_ish_in_msg, ec_response) + +#define OUT_MSG_EC_REQUEST_PREAMBLE \ + offsetof(struct cros_ish_out_msg, ec_request) + +#define cl_data_to_dev(client_data) ishtp_device((client_data)->cl_device) + +/* + * The Read-Write Semaphore is used to prevent message TX or RX while + * the ishtp client is being initialized or undergoing reset. + * + * The readers are the kernel function calls responsible for IA->ISH + * and ISH->AP messaging. + * + * The writers are .reset() and .probe() function. + */ +static DECLARE_RWSEM(init_lock); + +/** + * struct response_info - Encapsulate firmware response related + * information for passing between function ish_send() and + * process_recv() callback. + * + * @data: Copy the data received from firmware here. + * @max_size: Max size allocated for the @data buffer. If the received + * data exceeds this value, we log an error. + * @size: Actual size of data received from firmware. + * @error: 0 for success, negative error code for a failure in process_recv(). + * @token: Expected token for response that we are waiting on. + * @received: Set to true on receiving a valid firmware response to host command + * @wait_queue: Wait queue for host to wait for firmware response. + */ +struct response_info { + void *data; + size_t max_size; + size_t size; + int error; + u8 token; + bool received; + wait_queue_head_t wait_queue; +}; + +/** + * struct ishtp_cl_data - Encapsulate per ISH TP Client. + * + * @cros_ish_cl: ISHTP firmware client instance. + * @cl_device: ISHTP client device instance. + * @response: Response info passing between ish_send() and process_recv(). + * @work_ishtp_reset: Work queue reset handling. + * @work_ec_evt: Work queue for EC events. + * @ec_dev: CrOS EC MFD device. + * + * This structure is used to store per client data. + */ +struct ishtp_cl_data { + struct ishtp_cl *cros_ish_cl; + struct ishtp_cl_device *cl_device; + + /* + * Used for passing firmware response information between + * ish_send() and process_recv() callback. + */ + struct response_info response; + + struct work_struct work_ishtp_reset; + struct work_struct work_ec_evt; + struct cros_ec_device *ec_dev; +}; + +/** + * ish_evt_handler - ISH to AP event handler + * @work: Work struct + */ +static void ish_evt_handler(struct work_struct *work) +{ + struct ishtp_cl_data *client_data = + container_of(work, struct ishtp_cl_data, work_ec_evt); + + cros_ec_irq_thread(0, client_data->ec_dev); +} + +/** + * ish_send() - Send message from host to firmware + * + * @client_data: Client data instance + * @out_msg: Message buffer to be sent to firmware + * @out_size: Size of out going message + * @in_msg: Message buffer where the incoming data is copied. This buffer + * is allocated by calling + * @in_size: Max size of incoming message + * + * Return: Number of bytes copied in the in_msg on success, negative + * error code on failure. + */ +static int ish_send(struct ishtp_cl_data *client_data, + u8 *out_msg, size_t out_size, + u8 *in_msg, size_t in_size) +{ + static u8 next_token; + int rv; + struct header *out_hdr = (struct header *)out_msg; + struct ishtp_cl *cros_ish_cl = client_data->cros_ish_cl; + + dev_dbg(cl_data_to_dev(client_data), + "%s: channel=%02u status=%02u\n", + __func__, out_hdr->channel, out_hdr->status); + + /* Setup for incoming response */ + client_data->response.data = in_msg; + client_data->response.max_size = in_size; + client_data->response.error = 0; + client_data->response.token = next_token++; + client_data->response.received = false; + + out_hdr->token = client_data->response.token; + + rv = ishtp_cl_send(cros_ish_cl, out_msg, out_size); + if (rv) { + dev_err(cl_data_to_dev(client_data), + "ishtp_cl_send error %d\n", rv); + return rv; + } + + wait_event_interruptible_timeout(client_data->response.wait_queue, + client_data->response.received, + ISHTP_SEND_TIMEOUT); + if (!client_data->response.received) { + dev_err(cl_data_to_dev(client_data), + "Timed out for response to host message\n"); + return -ETIMEDOUT; + } + + if (client_data->response.error < 0) + return client_data->response.error; + + return client_data->response.size; +} + +/** + * process_recv() - Received and parse incoming packet + * @cros_ish_cl: Client instance to get stats + * @rb_in_proc: Host interface message buffer + * @timestamp: Timestamp of when parent callback started + * + * Parse the incoming packet. If it is a response packet then it will + * update per instance flags and wake up the caller waiting to for the + * response. If it is an event packet then it will schedule event work. + */ +static void process_recv(struct ishtp_cl *cros_ish_cl, + struct ishtp_cl_rb *rb_in_proc, ktime_t timestamp) +{ + size_t data_len = rb_in_proc->buf_idx; + struct ishtp_cl_data *client_data = + ishtp_get_client_data(cros_ish_cl); + struct device *dev = cl_data_to_dev(client_data); + struct cros_ish_in_msg *in_msg = + (struct cros_ish_in_msg *)rb_in_proc->buffer.data; + + /* Proceed only if reset or init is not in progress */ + if (!down_read_trylock(&init_lock)) { + /* Free the buffer */ + ishtp_cl_io_rb_recycle(rb_in_proc); + dev_warn(dev, + "Host is not ready to receive incoming messages\n"); + return; + } + + /* + * All firmware messages contain a header. Check the buffer size + * before accessing elements inside. + */ + if (!rb_in_proc->buffer.data) { + dev_warn(dev, "rb_in_proc->buffer.data returned null"); + client_data->response.error = -EBADMSG; + goto end_error; + } + + if (data_len < sizeof(struct header)) { + dev_err(dev, "data size %zu is less than header %zu\n", + data_len, sizeof(struct header)); + client_data->response.error = -EMSGSIZE; + goto end_error; + } + + dev_dbg(dev, "channel=%02u status=%02u\n", + in_msg->hdr.channel, in_msg->hdr.status); + + switch (in_msg->hdr.channel) { + case CROS_EC_COMMAND: + if (client_data->response.received) { + dev_err(dev, + "Previous firmware message not yet processed\n"); + goto end_error; + } + + if (client_data->response.token != in_msg->hdr.token) { + dev_err_ratelimited(dev, + "Dropping old response token %d\n", + in_msg->hdr.token); + goto end_error; + } + + /* Sanity check */ + if (!client_data->response.data) { + dev_err(dev, + "Receiving buffer is null. Should be allocated by calling function\n"); + client_data->response.error = -EINVAL; + goto error_wake_up; + } + + if (data_len > client_data->response.max_size) { + dev_err(dev, + "Received buffer size %zu is larger than allocated buffer %zu\n", + data_len, client_data->response.max_size); + client_data->response.error = -EMSGSIZE; + goto error_wake_up; + } + + if (in_msg->hdr.status) { + dev_err(dev, "firmware returned status %d\n", + in_msg->hdr.status); + client_data->response.error = -EIO; + goto error_wake_up; + } + + /* Update the actual received buffer size */ + client_data->response.size = data_len; + + /* + * Copy the buffer received in firmware response for the + * calling thread. + */ + memcpy(client_data->response.data, + rb_in_proc->buffer.data, data_len); + +error_wake_up: + /* Free the buffer since we copied data or didn't need it */ + ishtp_cl_io_rb_recycle(rb_in_proc); + rb_in_proc = NULL; + + /* Set flag before waking up the caller */ + client_data->response.received = true; + + /* Wake the calling thread */ + wake_up_interruptible(&client_data->response.wait_queue); + + break; + + case CROS_MKBP_EVENT: + /* Free the buffer. This is just an event without data */ + ishtp_cl_io_rb_recycle(rb_in_proc); + rb_in_proc = NULL; + /* + * Set timestamp from beginning of function since we actually + * got an incoming MKBP event + */ + client_data->ec_dev->last_event_time = timestamp; + schedule_work(&client_data->work_ec_evt); + + break; + + default: + dev_err(dev, "Invalid channel=%02d\n", in_msg->hdr.channel); + } + +end_error: + /* Free the buffer if we already haven't */ + if (rb_in_proc) + ishtp_cl_io_rb_recycle(rb_in_proc); + + up_read(&init_lock); +} + +/** + * ish_event_cb() - bus driver callback for incoming message + * @cl_device: ISHTP client device for which this message is targeted. + * + * Remove the packet from the list and process the message by calling + * process_recv. + */ +static void ish_event_cb(struct ishtp_cl_device *cl_device) +{ + struct ishtp_cl_rb *rb_in_proc; + struct ishtp_cl *cros_ish_cl = ishtp_get_drvdata(cl_device); + ktime_t timestamp; + + /* + * Take timestamp as close to hardware interrupt as possible for sensor + * timestamps. + */ + timestamp = cros_ec_get_time_ns(); + + while ((rb_in_proc = ishtp_cl_rx_get_rb(cros_ish_cl)) != NULL) { + /* Decide what to do with received data */ + process_recv(cros_ish_cl, rb_in_proc, timestamp); + } +} + +/** + * cros_ish_init() - Init function for ISHTP client + * @cros_ish_cl: ISHTP client instance + * + * This function complete the initializtion of the client. + * + * Return: 0 for success, negative error code for failure. + */ +static int cros_ish_init(struct ishtp_cl *cros_ish_cl) +{ + int rv; + struct ishtp_device *dev; + struct ishtp_fw_client *fw_client; + struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl); + + rv = ishtp_cl_link(cros_ish_cl); + if (rv) { + dev_err(cl_data_to_dev(client_data), + "ishtp_cl_link failed\n"); + return rv; + } + + dev = ishtp_get_ishtp_device(cros_ish_cl); + + /* Connect to firmware client */ + ishtp_set_tx_ring_size(cros_ish_cl, CROS_ISH_CL_TX_RING_SIZE); + ishtp_set_rx_ring_size(cros_ish_cl, CROS_ISH_CL_RX_RING_SIZE); + + fw_client = ishtp_fw_cl_get_client(dev, &cros_ec_ishtp_id_table[0].guid); + if (!fw_client) { + dev_err(cl_data_to_dev(client_data), + "ish client uuid not found\n"); + rv = -ENOENT; + goto err_cl_unlink; + } + + ishtp_cl_set_fw_client_id(cros_ish_cl, + ishtp_get_fw_client_id(fw_client)); + ishtp_set_connection_state(cros_ish_cl, ISHTP_CL_CONNECTING); + + rv = ishtp_cl_connect(cros_ish_cl); + if (rv) { + dev_err(cl_data_to_dev(client_data), + "client connect fail\n"); + goto err_cl_unlink; + } + + ishtp_register_event_cb(client_data->cl_device, ish_event_cb); + return 0; + +err_cl_unlink: + ishtp_cl_unlink(cros_ish_cl); + return rv; +} + +/** + * cros_ish_deinit() - Deinit function for ISHTP client + * @cros_ish_cl: ISHTP client instance + * + * Unlink and free cros_ec client + */ +static void cros_ish_deinit(struct ishtp_cl *cros_ish_cl) +{ + 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); + + /* Disband and free all Tx and Rx client-level rings */ + ishtp_cl_free(cros_ish_cl); +} + +/** + * prepare_cros_ec_rx() - Check & prepare receive buffer + * @ec_dev: CrOS EC MFD device. + * @in_msg: Incoming message buffer + * @msg: cros_ec command used to send & receive data + * + * Return: 0 for success, negative error code for failure. + * + * Check the received buffer. Convert to cros_ec_command format. + */ +static int prepare_cros_ec_rx(struct cros_ec_device *ec_dev, + const struct cros_ish_in_msg *in_msg, + struct cros_ec_command *msg) +{ + u8 sum = 0; + int i, rv, offset; + + /* Check response error code */ + msg->result = in_msg->ec_response.result; + rv = cros_ec_check_result(ec_dev, msg); + if (rv < 0) + return rv; + + if (in_msg->ec_response.data_len > msg->insize) { + dev_err(ec_dev->dev, "Packet too long (%d bytes, expected %d)", + in_msg->ec_response.data_len, msg->insize); + return -ENOSPC; + } + + /* Copy response packet payload and compute checksum */ + for (i = 0; i < sizeof(struct ec_host_response); i++) + sum += ((u8 *)in_msg)[IN_MSG_EC_RESPONSE_PREAMBLE + i]; + + offset = sizeof(struct cros_ish_in_msg); + for (i = 0; i < in_msg->ec_response.data_len; i++) + sum += msg->data[i] = ((u8 *)in_msg)[offset + i]; + + if (sum) { + dev_dbg(ec_dev->dev, "Bad received packet checksum %d\n", sum); + return -EBADMSG; + } + + return 0; +} + +static int cros_ec_pkt_xfer_ish(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + int rv; + struct ishtp_cl *cros_ish_cl = ec_dev->priv; + struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl); + struct device *dev = cl_data_to_dev(client_data); + struct cros_ish_in_msg *in_msg = (struct cros_ish_in_msg *)ec_dev->din; + struct cros_ish_out_msg *out_msg = + (struct cros_ish_out_msg *)ec_dev->dout; + size_t in_size = sizeof(struct cros_ish_in_msg) + msg->insize; + size_t out_size = sizeof(struct cros_ish_out_msg) + msg->outsize; + + /* Sanity checks */ + if (in_size > ec_dev->din_size) { + dev_err(dev, + "Incoming payload size %zu is too large for ec_dev->din_size %d\n", + in_size, ec_dev->din_size); + return -EMSGSIZE; + } + + if (out_size > ec_dev->dout_size) { + dev_err(dev, + "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; + rv = cros_ec_prepare_tx(ec_dev, msg); + if (rv < 0) + goto end_error; + 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) { + down_write(&init_lock); + 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 void 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); +} + +/** + * 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 = ishtp_dev_to_cl_device(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 = ishtp_dev_to_cl_device(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", + .id = cros_ec_ishtp_id_table, + .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 "); + +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3