mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
* CrOS EC: - Add new CrOS ISHTP transport protocol - Add proper documentation for debugfs entries and expose resume and uptime files - Select LPC transport protocol variant at runtime. - Add lid angle sensor driver - Fix oops on suspend/resume for lightbar driver - Set CrOS SPI transport protol in realtime * Wilco EC: - Add telemetry char device interface - Add support for event handling - Add new sysfs attributes * Misc: - Contains ib-mfd-cros-v5.3 immutable branch from mfd, with cros_ec_commands.h header freshly synced with Chrome OS's EC project. -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQQCtZK6p/AktxXfkOlzbaomhzOwwgUCXSbP3AAKCRBzbaomhzOw wjoNAP4lrY3UboMaQklHLOCxPTFXwIHjImXxJUCrezJj4eBRcwEAz+adSNKieVEY xNf/yetCkjVnQNMVjGaBJRUp3F+2LwQ= =/Xj3 -----END PGP SIGNATURE----- Merge tag 'tag-chrome-platform-for-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux Pull chrome platform updates from Benson Leung "CrOS EC: - Add new CrOS ISHTP transport protocol - Add proper documentation for debugfs entries and expose resume and uptime files - Select LPC transport protocol variant at runtime. - Add lid angle sensor driver - Fix oops on suspend/resume for lightbar driver - Set CrOS SPI transport protol in realtime Wilco EC: - Add telemetry char device interface - Add support for event handling - Add new sysfs attributes Misc: - Contains ib-mfd-cros-v5.3 immutable branch from mfd, with cros_ec_commands.h header freshly synced with Chrome OS's EC project" * tag 'tag-chrome-platform-for-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux: (54 commits) mfd / platform: cros_ec_debugfs: Expose resume result via debugfs platform/chrome: lightbar: Get drvdata from parent in suspend/resume iio: cros_ec: Add lid angle driver platform/chrome: wilco_ec: Add circular buffer as event queue platform/chrome: cros_ec_lpc_mec: Fix kernel-doc comment first line platform/chrome: cros_ec_lpc: Choose Microchip EC at runtime platform/chrome: cros_ec_lpc: Merge cros_ec_lpc and cros_ec_lpc_reg Input: cros_ec_keyb: mask out extra flags in event_type platform/chrome: wilco_ec: Fix unreleased lock in event_read() platform/chrome: cros_ec_debugfs: cros_ec_uptime_fops can be static platform/chrome: cros_ec_debugfs: Add debugfs ABI documentation platform/chrome: cros_ec_debugfs: Fix kernel-doc comment first line platform/chrome: cros_ec_debugfs: Add debugfs entry to retrieve EC uptime mfd: cros_ec: Update I2S API mfd: cros_ec: Add Management API entry points mfd: cros_ec: Add SKU ID and Secure storage API mfd: cros_ec: Add API for rwsig mfd: cros_ec: Add API for Fingerprint support mfd: cros_ec: Add API for Touchpad support mfd: cros_ec: Add API for EC-EC communication ...
279 lines
6.9 KiB
C
279 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ChromeOS EC multi-function device
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*
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* Copyright (C) 2012 Google, Inc
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*
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* The ChromeOS EC multi function device is used to mux all the requests
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* to the EC device for its multiple features: keyboard controller,
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* battery charging and regulator control, firmware update.
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*/
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#include <linux/of_platform.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/module.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/suspend.h>
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#include <asm/unaligned.h>
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#define CROS_EC_DEV_EC_INDEX 0
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#define CROS_EC_DEV_PD_INDEX 1
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static struct cros_ec_platform ec_p = {
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.ec_name = CROS_EC_DEV_NAME,
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.cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_EC_INDEX),
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};
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static struct cros_ec_platform pd_p = {
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.ec_name = CROS_EC_DEV_PD_NAME,
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.cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX),
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};
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static const struct mfd_cell ec_cell = {
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.name = "cros-ec-dev",
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.platform_data = &ec_p,
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.pdata_size = sizeof(ec_p),
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};
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static const struct mfd_cell ec_pd_cell = {
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.name = "cros-ec-dev",
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.platform_data = &pd_p,
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.pdata_size = sizeof(pd_p),
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};
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static irqreturn_t ec_irq_thread(int irq, void *data)
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{
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struct cros_ec_device *ec_dev = data;
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bool wake_event = true;
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int ret;
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ret = cros_ec_get_next_event(ec_dev, &wake_event);
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/*
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* Signal only if wake host events or any interrupt if
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* cros_ec_get_next_event() returned an error (default value for
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* wake_event is true)
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*/
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if (wake_event && device_may_wakeup(ec_dev->dev))
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pm_wakeup_event(ec_dev->dev, 0);
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if (ret > 0)
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blocking_notifier_call_chain(&ec_dev->event_notifier,
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0, ec_dev);
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return IRQ_HANDLED;
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}
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static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
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{
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int ret;
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struct {
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struct cros_ec_command msg;
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union {
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struct ec_params_host_sleep_event req0;
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struct ec_params_host_sleep_event_v1 req1;
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struct ec_response_host_sleep_event_v1 resp1;
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} u;
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} __packed buf;
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memset(&buf, 0, sizeof(buf));
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if (ec_dev->host_sleep_v1) {
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buf.u.req1.sleep_event = sleep_event;
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buf.u.req1.suspend_params.sleep_timeout_ms =
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EC_HOST_SLEEP_TIMEOUT_DEFAULT;
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buf.msg.outsize = sizeof(buf.u.req1);
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if ((sleep_event == HOST_SLEEP_EVENT_S3_RESUME) ||
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(sleep_event == HOST_SLEEP_EVENT_S0IX_RESUME))
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buf.msg.insize = sizeof(buf.u.resp1);
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buf.msg.version = 1;
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} else {
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buf.u.req0.sleep_event = sleep_event;
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buf.msg.outsize = sizeof(buf.u.req0);
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}
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buf.msg.command = EC_CMD_HOST_SLEEP_EVENT;
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ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
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/* For now, report failure to transition to S0ix with a warning. */
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if (ret >= 0 && ec_dev->host_sleep_v1 &&
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(sleep_event == HOST_SLEEP_EVENT_S0IX_RESUME)) {
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ec_dev->last_resume_result =
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buf.u.resp1.resume_response.sleep_transitions;
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WARN_ONCE(buf.u.resp1.resume_response.sleep_transitions &
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EC_HOST_RESUME_SLEEP_TIMEOUT,
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"EC detected sleep transition timeout. Total slp_s0 transitions: %d",
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buf.u.resp1.resume_response.sleep_transitions &
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EC_HOST_RESUME_SLEEP_TRANSITIONS_MASK);
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}
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return ret;
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}
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int cros_ec_register(struct cros_ec_device *ec_dev)
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{
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struct device *dev = ec_dev->dev;
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int err = 0;
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BLOCKING_INIT_NOTIFIER_HEAD(&ec_dev->event_notifier);
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ec_dev->max_request = sizeof(struct ec_params_hello);
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ec_dev->max_response = sizeof(struct ec_response_get_protocol_info);
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ec_dev->max_passthru = 0;
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ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
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if (!ec_dev->din)
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return -ENOMEM;
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ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);
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if (!ec_dev->dout)
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return -ENOMEM;
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mutex_init(&ec_dev->lock);
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err = cros_ec_query_all(ec_dev);
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if (err) {
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dev_err(dev, "Cannot identify the EC: error %d\n", err);
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return err;
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}
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if (ec_dev->irq) {
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err = devm_request_threaded_irq(dev, ec_dev->irq, NULL,
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ec_irq_thread, IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"chromeos-ec", ec_dev);
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if (err) {
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dev_err(dev, "Failed to request IRQ %d: %d",
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ec_dev->irq, err);
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return err;
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}
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}
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err = devm_mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, &ec_cell,
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1, NULL, ec_dev->irq, NULL);
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if (err) {
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dev_err(dev,
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"Failed to register Embedded Controller subdevice %d\n",
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err);
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return err;
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}
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if (ec_dev->max_passthru) {
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/*
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* Register a PD device as well on top of this device.
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* We make the following assumptions:
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* - behind an EC, we have a pd
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* - only one device added.
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* - the EC is responsive at init time (it is not true for a
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* sensor hub.
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*/
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err = devm_mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO,
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&ec_pd_cell, 1, NULL, ec_dev->irq, NULL);
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if (err) {
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dev_err(dev,
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"Failed to register Power Delivery subdevice %d\n",
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err);
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return err;
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}
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}
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if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
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err = devm_of_platform_populate(dev);
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if (err) {
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mfd_remove_devices(dev);
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dev_err(dev, "Failed to register sub-devices\n");
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return err;
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}
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}
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/*
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* Clear sleep event - this will fail harmlessly on platforms that
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* don't implement the sleep event host command.
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*/
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err = cros_ec_sleep_event(ec_dev, 0);
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if (err < 0)
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dev_dbg(ec_dev->dev, "Error %d clearing sleep event to ec",
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err);
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dev_info(dev, "Chrome EC device registered\n");
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return 0;
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}
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EXPORT_SYMBOL(cros_ec_register);
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#ifdef CONFIG_PM_SLEEP
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int cros_ec_suspend(struct cros_ec_device *ec_dev)
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{
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struct device *dev = ec_dev->dev;
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int ret;
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u8 sleep_event;
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sleep_event = (!IS_ENABLED(CONFIG_ACPI) || pm_suspend_via_firmware()) ?
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HOST_SLEEP_EVENT_S3_SUSPEND :
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HOST_SLEEP_EVENT_S0IX_SUSPEND;
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ret = cros_ec_sleep_event(ec_dev, sleep_event);
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if (ret < 0)
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dev_dbg(ec_dev->dev, "Error %d sending suspend event to ec",
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ret);
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if (device_may_wakeup(dev))
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ec_dev->wake_enabled = !enable_irq_wake(ec_dev->irq);
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disable_irq(ec_dev->irq);
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ec_dev->was_wake_device = ec_dev->wake_enabled;
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ec_dev->suspended = true;
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return 0;
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}
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EXPORT_SYMBOL(cros_ec_suspend);
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static void cros_ec_report_events_during_suspend(struct cros_ec_device *ec_dev)
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{
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while (ec_dev->mkbp_event_supported &&
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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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1, ec_dev);
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}
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int cros_ec_resume(struct cros_ec_device *ec_dev)
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{
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int ret;
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u8 sleep_event;
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ec_dev->suspended = false;
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enable_irq(ec_dev->irq);
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sleep_event = (!IS_ENABLED(CONFIG_ACPI) || pm_suspend_via_firmware()) ?
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HOST_SLEEP_EVENT_S3_RESUME :
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HOST_SLEEP_EVENT_S0IX_RESUME;
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ret = cros_ec_sleep_event(ec_dev, sleep_event);
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if (ret < 0)
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dev_dbg(ec_dev->dev, "Error %d sending resume event to ec",
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ret);
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if (ec_dev->wake_enabled) {
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disable_irq_wake(ec_dev->irq);
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ec_dev->wake_enabled = 0;
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}
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/*
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* Let the mfd devices know about events that occur during
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* suspend. This way the clients know what to do with them.
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*/
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cros_ec_report_events_during_suspend(ec_dev);
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return 0;
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}
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EXPORT_SYMBOL(cros_ec_resume);
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#endif
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ChromeOS EC core driver");
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