* [PATCH v10 0/2] usb: typec: Implement UCSI driver for ChromeOS @ 2024-12-04 19:48 Łukasz Bartosik 2024-12-04 19:48 ` [PATCH v10 1/2] platform/chrome: Update ChromeOS EC header for UCSI Łukasz Bartosik 2024-12-04 19:49 ` [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver Łukasz Bartosik 0 siblings, 2 replies; 6+ messages in thread From: Łukasz Bartosik @ 2024-12-04 19:48 UTC (permalink / raw) To: Heikki Krogerus, Greg Kroah-Hartman, Benson Leung, Dmitry Baryshkov Cc: Abhishek Pandit-Subedi, Jameson Thies, Pavan Holla, Tzung-Bi Shih, linux-usb, chrome-platform This series implements a UCSI ChromeOS EC transport driver. The ChromeOS EC is expected to implement UCSI Platform Policy Manager (PPM). --- Changes in v10: - Added cancel_delayed_work() in the cros_ucsi_suspend() in order to prevent premature wake up during suspend. - Added cancel_delayed_work() in the cros_ucsi_destroy() as well. - Link to v9: https://lore.kernel.org/linux-usb/20241203142314.3892422-1-ukaszb@chromium.org/ Changes in v9: - Squash "usb: typec: cros_ec_ucsi: Recover from write timeouts" commit into "usb: typec: ucsi: Implement ChromeOS UCSI driver". - Replaced out label in cros_ucsi_sync_control() with switch statement. - Link to v8: https://lore.kernel.org/linux-usb/20241128232035.1525978-1-ukaszb@chromium.org/ Changes in v8: - Set .sync_control in cros_ucsi_ops struct to point to ucsi_sync_control_common(). - Added explanation why complete() is used instead of resume() in cros_ucsi_pm_ops struct. - Updated s/miliseconds/milliseconds/. - Link to v7: https://lore.kernel.org/linux-usb/20241115155234.1587589-1-ukaszb@chromium.org/ Changes in v7: - Dropped the following commits for now as I want to focus on upstreaming cros_ec_ucsi driver first. Then I will get back to the topic of trace events and netlink: "usb: typec: cros_ec_ucsi: Add trace events" "usb: typec: cros_ec_ucsi: Add netlink" - Squashed "usb: typec: cros_ec_ucsi: Use complete instead of resume" into "usb: typec: ucsi: Implement ChromeOS UCSI driver". - Added "usb: typec: cros_ec_ucsi: Recover from write timeouts" commmit. - Added usage of common functins ucsi_sync_control_common() and ucsi_notify_common(). - Commits: "platform/chrome: Update EC feature flags" "mfd: cros_ec: Load cros_ec_ucsi on supported ECs" "mfd: cros_ec: Don't load charger with UCSI" landed in the tree https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git/log/?h=for-mfd-next - Link to v6: https://lore.kernel.org/linux-usb/20240910101527.603452-1-ukaszb@chromium.org Changes in v6: - Reverted to type names uint*_t in cros_ec_commands.h in order to be consistent with type names used in other parts of the file. - Updated comments in cros_ec_commands.h related to UCSI. - Added missing sign-offs. - Fixed memory leak in cros_ucsi_async_control() by moving ec_params_ucsi_ppm_set request buffer to stack. - Replaced cros_ucsi_read with cros_ucsi_read_cci in cros_ucsi_work(). - Updated changes in v5, it was missing information related to commits addition: platform/chrome: Update EC feature flags usb: typec: cros_ec_ucsi: Use complete instead of resume mfd: cros_ec: Load cros_ec_ucsi on supported ECs mfd: cros_ec: Don't load charger with UCSI - Link to v5: https://lore.kernel.org/r/all/20240903163033.3170815-1-ukaszb@chromium.org/ Changes in v5: - Increased WRITE_TMO_MS to 5000. - Replaced DRV_NAME with KBUILD_MODNAME. - Added comments for WRITE_TMO_MS and MAX_EC_DATA_SIZE defines. - Refactored cros_ucsi_async_control() to dynamically allocate memory for a message to EC instead of allocating the message on stack. - Replaced type names uint*_t with u*. - Removed ret variable in cros_ucsi_work(). - Updated ucsi_operations interface to align with changes introduced in v6.11. - Replaced test_bit() with test_and_clear_bit() in cros_ucsi_work(). - Updated EC feature flags in commit "platform/chrome: Update EC feature flags". - Added new commit "usb: typec: cros_ec_ucsi: Use complete instead of resume". - Added trace events in commit "usb: typec: cros_ec_ucsi: Add trace events". - Added netlink in commit "usb: typec: cros_ec_ucsi: Add netlink" for debugging and testing puropses. - Added new commit "mfd: cros_ec: Load cros_ec_ucsi on supported ECs". - Added new commit "mfd: cros_ec: Don't load charger with UCSI". - Link to v4: https://lore.kernel.org/all/CAB2FV=6We88NrvN8NZYt8NkMFH9N_ZBGyUWVUpGwPdja2X_+NA@mail.gmail.com/T/ Changes in v4: - Setup notifications before calling ucsi_register. - Cancel work before destroying driver data. - Link to v3: https://lore.kernel.org/r/20240403-public-ucsi-h-v3-0-f848e18c8ed2@chromium.org Changes in v3: - Moved driver from platform/chrome to usb/typec/ucsi. - Used id_table instead of MODULE_ALIAS. - Split EC header changes into seperate commit. - Fixes from additional internal reviews and kernel bot warnings. - Link to v2: https://lore.kernel.org/r/20240325-public-ucsi-h-v2-0-a6d716968bb1@chromium.org Changes in v2: - No code or commit message changes. - Added drivers/platform/chrome maintainers for review. Pavan Holla (2): platform/chrome: Update ChromeOS EC header for UCSI usb: typec: ucsi: Implement ChromeOS UCSI driver MAINTAINERS | 7 + drivers/usb/typec/ucsi/Kconfig | 13 + drivers/usb/typec/ucsi/Makefile | 1 + drivers/usb/typec/ucsi/cros_ec_ucsi.c | 337 ++++++++++++++++++ .../linux/platform_data/cros_ec_commands.h | 28 +- 5 files changed, 385 insertions(+), 1 deletion(-) create mode 100644 drivers/usb/typec/ucsi/cros_ec_ucsi.c -- 2.47.0.338.g60cca15819-goog ^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v10 1/2] platform/chrome: Update ChromeOS EC header for UCSI 2024-12-04 19:48 [PATCH v10 0/2] usb: typec: Implement UCSI driver for ChromeOS Łukasz Bartosik @ 2024-12-04 19:48 ` Łukasz Bartosik 2024-12-04 19:49 ` [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver Łukasz Bartosik 1 sibling, 0 replies; 6+ messages in thread From: Łukasz Bartosik @ 2024-12-04 19:48 UTC (permalink / raw) To: Heikki Krogerus, Greg Kroah-Hartman, Benson Leung, Dmitry Baryshkov Cc: Abhishek Pandit-Subedi, Jameson Thies, Pavan Holla, Tzung-Bi Shih, linux-usb, chrome-platform From: Pavan Holla <pholla@chromium.org> Add EC host commands for reading and writing UCSI structures in the EC. The corresponding kernel driver is cros-ec-ucsi. Also update PD events supported by the EC. Acked-by: Tzung-Bi Shih <tzungbi@kernel.org> Signed-off-by: Pavan Holla <pholla@chromium.org> Signed-off-by: Łukasz Bartosik <ukaszb@chromium.org> --- .../linux/platform_data/cros_ec_commands.h | 28 ++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index b3c4993e656e..ecf290a0c98f 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -5044,8 +5044,11 @@ struct ec_response_pd_status { #define PD_EVENT_POWER_CHANGE BIT(1) #define PD_EVENT_IDENTITY_RECEIVED BIT(2) #define PD_EVENT_DATA_SWAP BIT(3) +#define PD_EVENT_TYPEC BIT(4) +#define PD_EVENT_PPM BIT(5) + struct ec_response_host_event_status { - uint32_t status; /* PD MCU host event status */ + uint32_t status; /* PD MCU host event status */ } __ec_align4; /* Set USB type-C port role and muxes */ @@ -6105,6 +6108,29 @@ struct ec_response_typec_vdm_response { #undef VDO_MAX_SIZE +/* + * UCSI OPM-PPM commands + * + * These commands are used for communication between OPM and PPM. + * Only UCSI3.0 is tested. + */ + +#define EC_CMD_UCSI_PPM_SET 0x0140 + +/* The data size is stored in the host command protocol header. */ +struct ec_params_ucsi_ppm_set { + uint16_t offset; + uint8_t data[]; +} __ec_align2; + +#define EC_CMD_UCSI_PPM_GET 0x0141 + +/* For 'GET' sub-commands, data will be returned as a raw payload. */ +struct ec_params_ucsi_ppm_get { + uint16_t offset; + uint8_t size; +} __ec_align2; + /*****************************************************************************/ /* The command range 0x200-0x2FF is reserved for Rotor. */ -- 2.47.0.338.g60cca15819-goog ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver 2024-12-04 19:48 [PATCH v10 0/2] usb: typec: Implement UCSI driver for ChromeOS Łukasz Bartosik 2024-12-04 19:48 ` [PATCH v10 1/2] platform/chrome: Update ChromeOS EC header for UCSI Łukasz Bartosik @ 2024-12-04 19:49 ` Łukasz Bartosik 2024-12-05 14:48 ` Heikki Krogerus 2024-12-09 16:48 ` Abhishek Pandit-Subedi 1 sibling, 2 replies; 6+ messages in thread From: Łukasz Bartosik @ 2024-12-04 19:49 UTC (permalink / raw) To: Heikki Krogerus, Greg Kroah-Hartman, Benson Leung, Dmitry Baryshkov Cc: Abhishek Pandit-Subedi, Jameson Thies, Pavan Holla, Tzung-Bi Shih, linux-usb, chrome-platform From: Pavan Holla <pholla@chromium.org> Implementation of a UCSI transport driver for ChromeOS. This driver will be loaded if the ChromeOS EC implements a PPM. Signed-off-by: Pavan Holla <pholla@chromium.org> Co-developed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> Co-developed-by: Łukasz Bartosik <ukaszb@chromium.org> Signed-off-by: Łukasz Bartosik <ukaszb@chromium.org> --- MAINTAINERS | 7 + drivers/usb/typec/ucsi/Kconfig | 13 + drivers/usb/typec/ucsi/Makefile | 1 + drivers/usb/typec/ucsi/cros_ec_ucsi.c | 337 ++++++++++++++++++++++++++ 4 files changed, 358 insertions(+) create mode 100644 drivers/usb/typec/ucsi/cros_ec_ucsi.c diff --git a/MAINTAINERS b/MAINTAINERS index 1e930c7a58b1..36eebe1ad078 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5452,6 +5452,13 @@ L: chrome-platform@lists.linux.dev S: Maintained F: drivers/watchdog/cros_ec_wdt.c +CHROMEOS UCSI DRIVER +M: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> +M: Łukasz Bartosik <ukaszb@chromium.org> +L: chrome-platform@lists.linux.dev +S: Maintained +F: drivers/usb/typec/ucsi/cros_ec_ucsi.c + CHRONTEL CH7322 CEC DRIVER M: Joe Tessler <jrt@google.com> L: linux-media@vger.kernel.org diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig index 680e1b87b152..75559601fe8f 100644 --- a/drivers/usb/typec/ucsi/Kconfig +++ b/drivers/usb/typec/ucsi/Kconfig @@ -69,6 +69,19 @@ config UCSI_PMIC_GLINK To compile the driver as a module, choose M here: the module will be called ucsi_glink. +config CROS_EC_UCSI + tristate "UCSI Driver for ChromeOS EC" + depends on MFD_CROS_EC_DEV + depends on CROS_USBPD_NOTIFY + depends on !EXTCON_TCSS_CROS_EC + default MFD_CROS_EC_DEV + help + This driver enables UCSI support for a ChromeOS EC. The EC is + expected to implement a PPM. + + To compile the driver as a module, choose M here: the module + will be called cros_ec_ucsi. + config UCSI_LENOVO_YOGA_C630 tristate "UCSI Interface Driver for Lenovo Yoga C630" depends on EC_LENOVO_YOGA_C630 diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile index aed41d23887b..be98a879104d 100644 --- a/drivers/usb/typec/ucsi/Makefile +++ b/drivers/usb/typec/ucsi/Makefile @@ -21,4 +21,5 @@ obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o obj-$(CONFIG_UCSI_CCG) += ucsi_ccg.o obj-$(CONFIG_UCSI_STM32G0) += ucsi_stm32g0.o obj-$(CONFIG_UCSI_PMIC_GLINK) += ucsi_glink.o +obj-$(CONFIG_CROS_EC_UCSI) += cros_ec_ucsi.o obj-$(CONFIG_UCSI_LENOVO_YOGA_C630) += ucsi_yoga_c630.o diff --git a/drivers/usb/typec/ucsi/cros_ec_ucsi.c b/drivers/usb/typec/ucsi/cros_ec_ucsi.c new file mode 100644 index 000000000000..cd2231d6a0ea --- /dev/null +++ b/drivers/usb/typec/ucsi/cros_ec_ucsi.c @@ -0,0 +1,337 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * UCSI driver for ChromeOS EC + * + * Copyright 2024 Google LLC. + */ + +#include <linux/container_of.h> +#include <linux/dev_printk.h> +#include <linux/jiffies.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_data/cros_ec_commands.h> +#include <linux/platform_data/cros_usbpd_notify.h> +#include <linux/platform_data/cros_ec_proto.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/wait.h> + +#include "ucsi.h" + +/* + * Maximum size in bytes of a UCSI message between AP and EC + */ +#define MAX_EC_DATA_SIZE 256 + +/* + * Maximum time in milliseconds the cros_ec_ucsi driver + * will wait for a response to a command or and ack. + */ +#define WRITE_TMO_MS 5000 + +/* Number of times to attempt recovery from a write timeout before giving up. */ +#define WRITE_TMO_CTR_MAX 5 + +struct cros_ucsi_data { + struct device *dev; + struct ucsi *ucsi; + + struct cros_ec_device *ec; + struct notifier_block nb; + struct work_struct work; + struct delayed_work write_tmo; + int tmo_counter; + + struct completion complete; + unsigned long flags; +}; + +static int cros_ucsi_read(struct ucsi *ucsi, unsigned int offset, void *val, + size_t val_len) +{ + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); + struct ec_params_ucsi_ppm_get req = { + .offset = offset, + .size = val_len, + }; + int ret; + + if (val_len > MAX_EC_DATA_SIZE) { + dev_err(udata->dev, "Can't read %zu bytes. Too big.", val_len); + return -EINVAL; + } + + ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_GET, + &req, sizeof(req), val, val_len); + if (ret < 0) { + dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_GET: error=%d", ret); + return ret; + } + return 0; +} + +static int cros_ucsi_read_version(struct ucsi *ucsi, u16 *version) +{ + return cros_ucsi_read(ucsi, UCSI_VERSION, version, sizeof(*version)); +} + +static int cros_ucsi_read_cci(struct ucsi *ucsi, u32 *cci) +{ + return cros_ucsi_read(ucsi, UCSI_CCI, cci, sizeof(*cci)); +} + +static int cros_ucsi_read_message_in(struct ucsi *ucsi, void *val, + size_t val_len) +{ + return cros_ucsi_read(ucsi, UCSI_MESSAGE_IN, val, val_len); +} + +static int cros_ucsi_async_control(struct ucsi *ucsi, u64 cmd) +{ + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); + u8 ec_buf[sizeof(struct ec_params_ucsi_ppm_set) + sizeof(cmd)]; + struct ec_params_ucsi_ppm_set *req = (struct ec_params_ucsi_ppm_set *) ec_buf; + int ret; + + req->offset = UCSI_CONTROL; + memcpy(req->data, &cmd, sizeof(cmd)); + ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_SET, + req, sizeof(ec_buf), NULL, 0); + if (ret < 0) { + dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_SET: error=%d", ret); + return ret; + } + return 0; +} + +static int cros_ucsi_sync_control(struct ucsi *ucsi, u64 cmd) +{ + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); + int ret; + + ret = ucsi_sync_control_common(ucsi, cmd); + switch (ret) { + case -EBUSY: + /* EC may return -EBUSY if CCI.busy is set. + * Convert this to a timeout. + */ + case -ETIMEDOUT: + /* Schedule recovery attempt when we timeout + * or tried to send a command while still busy. + */ + cancel_delayed_work_sync(&udata->write_tmo); + schedule_delayed_work(&udata->write_tmo, + msecs_to_jiffies(WRITE_TMO_MS)); + break; + case 0: + /* Successful write. Cancel any pending recovery work. */ + cancel_delayed_work_sync(&udata->write_tmo); + break; + } + + return ret; +} + +struct ucsi_operations cros_ucsi_ops = { + .read_version = cros_ucsi_read_version, + .read_cci = cros_ucsi_read_cci, + .read_message_in = cros_ucsi_read_message_in, + .async_control = cros_ucsi_async_control, + .sync_control = cros_ucsi_sync_control, +}; + +static void cros_ucsi_work(struct work_struct *work) +{ + struct cros_ucsi_data *udata = container_of(work, struct cros_ucsi_data, work); + u32 cci; + + if (cros_ucsi_read_cci(udata->ucsi, &cci)) + return; + + ucsi_notify_common(udata->ucsi, cci); +} + +static void cros_ucsi_write_timeout(struct work_struct *work) +{ + struct cros_ucsi_data *udata = + container_of(work, struct cros_ucsi_data, write_tmo.work); + u32 cci; + u64 cmd; + + if (cros_ucsi_read(udata->ucsi, UCSI_CCI, &cci, sizeof(cci))) { + dev_err(udata->dev, + "Reading CCI failed; no write timeout recovery possible."); + return; + } + + if (cci & UCSI_CCI_BUSY) { + udata->tmo_counter++; + + if (udata->tmo_counter <= WRITE_TMO_CTR_MAX) + schedule_delayed_work(&udata->write_tmo, + msecs_to_jiffies(WRITE_TMO_MS)); + else + dev_err(udata->dev, + "PPM unresponsive - too many write timeouts."); + + return; + } + + /* No longer busy means we can reset our timeout counter. */ + udata->tmo_counter = 0; + + /* Need to ack previous command which may have timed out. */ + if (cci & UCSI_CCI_COMMAND_COMPLETE) { + cmd = UCSI_ACK_CC_CI | UCSI_ACK_COMMAND_COMPLETE; + cros_ucsi_async_control(udata->ucsi, &cmd); + + /* Check again after a few seconds that the system has + * recovered to make sure our async write above was successful. + */ + schedule_delayed_work(&udata->write_tmo, + msecs_to_jiffies(WRITE_TMO_MS)); + return; + } + + /* We recovered from a previous timeout. Treat this as a recovery from + * suspend and call resume. + */ + ucsi_resume(udata->ucsi); +} + +static int cros_ucsi_event(struct notifier_block *nb, + unsigned long host_event, void *_notify) +{ + struct cros_ucsi_data *udata = container_of(nb, struct cros_ucsi_data, nb); + + if (!(host_event & PD_EVENT_PPM)) + return NOTIFY_OK; + + dev_dbg(udata->dev, "UCSI notification received"); + flush_work(&udata->work); + schedule_work(&udata->work); + + return NOTIFY_OK; +} + +static void cros_ucsi_destroy(struct cros_ucsi_data *udata) +{ + cros_usbpd_unregister_notify(&udata->nb); + cancel_delayed_work(&udata->write_tmo); + cancel_work_sync(&udata->work); + ucsi_destroy(udata->ucsi); +} + +static int cros_ucsi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_dev *ec_data = dev_get_drvdata(dev->parent); + struct cros_ucsi_data *udata; + int ret; + + udata = devm_kzalloc(dev, sizeof(*udata), GFP_KERNEL); + if (!udata) + return -ENOMEM; + + udata->dev = dev; + + udata->ec = ec_data->ec_dev; + if (!udata->ec) { + dev_err(dev, "couldn't find parent EC device"); + return -ENODEV; + } + + platform_set_drvdata(pdev, udata); + + INIT_WORK(&udata->work, cros_ucsi_work); + INIT_DELAYED_WORK(&udata->write_tmo, cros_ucsi_write_timeout); + init_completion(&udata->complete); + + udata->ucsi = ucsi_create(dev, &cros_ucsi_ops); + if (IS_ERR(udata->ucsi)) { + dev_err(dev, "failed to allocate UCSI instance"); + return PTR_ERR(udata->ucsi); + } + + ucsi_set_drvdata(udata->ucsi, udata); + + udata->nb.notifier_call = cros_ucsi_event; + ret = cros_usbpd_register_notify(&udata->nb); + if (ret) { + dev_err(dev, "failed to register notifier: error=%d", ret); + ucsi_destroy(udata->ucsi); + return ret; + } + + ret = ucsi_register(udata->ucsi); + if (ret) { + dev_err(dev, "failed to register UCSI: error=%d", ret); + cros_ucsi_destroy(udata); + return ret; + } + + return 0; +} + +static void cros_ucsi_remove(struct platform_device *dev) +{ + struct cros_ucsi_data *udata = platform_get_drvdata(dev); + + ucsi_unregister(udata->ucsi); + cros_ucsi_destroy(udata); +} + +static int __maybe_unused cros_ucsi_suspend(struct device *dev) +{ + struct cros_ucsi_data *udata = dev_get_drvdata(dev); + + cancel_delayed_work(&udata->write_tmo); + cancel_work_sync(&udata->work); + + return 0; +} + +static void __maybe_unused cros_ucsi_complete(struct device *dev) +{ + struct cros_ucsi_data *udata = dev_get_drvdata(dev); + + ucsi_resume(udata->ucsi); +} + +/* + * UCSI protocol is also used on ChromeOS platforms which reply on + * cros_ec_lpc.c driver for communication with embedded controller (EC). + * On such platforms communication with the EC is not available until + * the .complete() callback of the cros_ec_lpc driver is executed. + * For this reason we delay ucsi_resume() until the .complete() stage + * otherwise UCSI SET_NOTIFICATION_ENABLE command will fail and we won't + * receive any UCSI notifications from the EC where PPM is implemented. + */ +static const struct dev_pm_ops cros_ucsi_pm_ops = { +#ifdef CONFIG_PM_SLEEP + .suspend = cros_ucsi_suspend, + .complete = cros_ucsi_complete, +#endif +}; + +static const struct platform_device_id cros_ucsi_id[] = { + { KBUILD_MODNAME, 0 }, + {} +}; +MODULE_DEVICE_TABLE(platform, cros_ucsi_id); + +static struct platform_driver cros_ucsi_driver = { + .driver = { + .name = KBUILD_MODNAME, + .pm = &cros_ucsi_pm_ops, + }, + .id_table = cros_ucsi_id, + .probe = cros_ucsi_probe, + .remove = cros_ucsi_remove, +}; + +module_platform_driver(cros_ucsi_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("UCSI driver for ChromeOS EC"); -- 2.47.0.338.g60cca15819-goog ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver 2024-12-04 19:49 ` [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver Łukasz Bartosik @ 2024-12-05 14:48 ` Heikki Krogerus 2024-12-09 16:48 ` Abhishek Pandit-Subedi 1 sibling, 0 replies; 6+ messages in thread From: Heikki Krogerus @ 2024-12-05 14:48 UTC (permalink / raw) To: Łukasz Bartosik Cc: Greg Kroah-Hartman, Benson Leung, Dmitry Baryshkov, Abhishek Pandit-Subedi, Jameson Thies, Pavan Holla, Tzung-Bi Shih, linux-usb, chrome-platform On Wed, Dec 04, 2024 at 07:49:00PM +0000, Łukasz Bartosik wrote: > From: Pavan Holla <pholla@chromium.org> > > Implementation of a UCSI transport driver for ChromeOS. > This driver will be loaded if the ChromeOS EC implements a PPM. > > Signed-off-by: Pavan Holla <pholla@chromium.org> > Co-developed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > Co-developed-by: Łukasz Bartosik <ukaszb@chromium.org> > Signed-off-by: Łukasz Bartosik <ukaszb@chromium.org> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > --- > MAINTAINERS | 7 + > drivers/usb/typec/ucsi/Kconfig | 13 + > drivers/usb/typec/ucsi/Makefile | 1 + > drivers/usb/typec/ucsi/cros_ec_ucsi.c | 337 ++++++++++++++++++++++++++ > 4 files changed, 358 insertions(+) > create mode 100644 drivers/usb/typec/ucsi/cros_ec_ucsi.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 1e930c7a58b1..36eebe1ad078 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -5452,6 +5452,13 @@ L: chrome-platform@lists.linux.dev > S: Maintained > F: drivers/watchdog/cros_ec_wdt.c > > +CHROMEOS UCSI DRIVER > +M: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > +M: Łukasz Bartosik <ukaszb@chromium.org> > +L: chrome-platform@lists.linux.dev > +S: Maintained > +F: drivers/usb/typec/ucsi/cros_ec_ucsi.c > + > CHRONTEL CH7322 CEC DRIVER > M: Joe Tessler <jrt@google.com> > L: linux-media@vger.kernel.org > diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig > index 680e1b87b152..75559601fe8f 100644 > --- a/drivers/usb/typec/ucsi/Kconfig > +++ b/drivers/usb/typec/ucsi/Kconfig > @@ -69,6 +69,19 @@ config UCSI_PMIC_GLINK > To compile the driver as a module, choose M here: the module will be > called ucsi_glink. > > +config CROS_EC_UCSI > + tristate "UCSI Driver for ChromeOS EC" > + depends on MFD_CROS_EC_DEV > + depends on CROS_USBPD_NOTIFY > + depends on !EXTCON_TCSS_CROS_EC > + default MFD_CROS_EC_DEV > + help > + This driver enables UCSI support for a ChromeOS EC. The EC is > + expected to implement a PPM. > + > + To compile the driver as a module, choose M here: the module > + will be called cros_ec_ucsi. > + > config UCSI_LENOVO_YOGA_C630 > tristate "UCSI Interface Driver for Lenovo Yoga C630" > depends on EC_LENOVO_YOGA_C630 > diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile > index aed41d23887b..be98a879104d 100644 > --- a/drivers/usb/typec/ucsi/Makefile > +++ b/drivers/usb/typec/ucsi/Makefile > @@ -21,4 +21,5 @@ obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o > obj-$(CONFIG_UCSI_CCG) += ucsi_ccg.o > obj-$(CONFIG_UCSI_STM32G0) += ucsi_stm32g0.o > obj-$(CONFIG_UCSI_PMIC_GLINK) += ucsi_glink.o > +obj-$(CONFIG_CROS_EC_UCSI) += cros_ec_ucsi.o > obj-$(CONFIG_UCSI_LENOVO_YOGA_C630) += ucsi_yoga_c630.o > diff --git a/drivers/usb/typec/ucsi/cros_ec_ucsi.c b/drivers/usb/typec/ucsi/cros_ec_ucsi.c > new file mode 100644 > index 000000000000..cd2231d6a0ea > --- /dev/null > +++ b/drivers/usb/typec/ucsi/cros_ec_ucsi.c > @@ -0,0 +1,337 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * UCSI driver for ChromeOS EC > + * > + * Copyright 2024 Google LLC. > + */ > + > +#include <linux/container_of.h> > +#include <linux/dev_printk.h> > +#include <linux/jiffies.h> > +#include <linux/mod_devicetable.h> > +#include <linux/module.h> > +#include <linux/platform_data/cros_ec_commands.h> > +#include <linux/platform_data/cros_usbpd_notify.h> > +#include <linux/platform_data/cros_ec_proto.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > +#include <linux/wait.h> > + > +#include "ucsi.h" > + > +/* > + * Maximum size in bytes of a UCSI message between AP and EC > + */ > +#define MAX_EC_DATA_SIZE 256 > + > +/* > + * Maximum time in milliseconds the cros_ec_ucsi driver > + * will wait for a response to a command or and ack. > + */ > +#define WRITE_TMO_MS 5000 > + > +/* Number of times to attempt recovery from a write timeout before giving up. */ > +#define WRITE_TMO_CTR_MAX 5 > + > +struct cros_ucsi_data { > + struct device *dev; > + struct ucsi *ucsi; > + > + struct cros_ec_device *ec; > + struct notifier_block nb; > + struct work_struct work; > + struct delayed_work write_tmo; > + int tmo_counter; > + > + struct completion complete; > + unsigned long flags; > +}; > + > +static int cros_ucsi_read(struct ucsi *ucsi, unsigned int offset, void *val, > + size_t val_len) > +{ > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > + struct ec_params_ucsi_ppm_get req = { > + .offset = offset, > + .size = val_len, > + }; > + int ret; > + > + if (val_len > MAX_EC_DATA_SIZE) { > + dev_err(udata->dev, "Can't read %zu bytes. Too big.", val_len); > + return -EINVAL; > + } > + > + ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_GET, > + &req, sizeof(req), val, val_len); > + if (ret < 0) { > + dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_GET: error=%d", ret); > + return ret; > + } > + return 0; > +} > + > +static int cros_ucsi_read_version(struct ucsi *ucsi, u16 *version) > +{ > + return cros_ucsi_read(ucsi, UCSI_VERSION, version, sizeof(*version)); > +} > + > +static int cros_ucsi_read_cci(struct ucsi *ucsi, u32 *cci) > +{ > + return cros_ucsi_read(ucsi, UCSI_CCI, cci, sizeof(*cci)); > +} > + > +static int cros_ucsi_read_message_in(struct ucsi *ucsi, void *val, > + size_t val_len) > +{ > + return cros_ucsi_read(ucsi, UCSI_MESSAGE_IN, val, val_len); > +} > + > +static int cros_ucsi_async_control(struct ucsi *ucsi, u64 cmd) > +{ > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > + u8 ec_buf[sizeof(struct ec_params_ucsi_ppm_set) + sizeof(cmd)]; > + struct ec_params_ucsi_ppm_set *req = (struct ec_params_ucsi_ppm_set *) ec_buf; > + int ret; > + > + req->offset = UCSI_CONTROL; > + memcpy(req->data, &cmd, sizeof(cmd)); > + ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_SET, > + req, sizeof(ec_buf), NULL, 0); > + if (ret < 0) { > + dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_SET: error=%d", ret); > + return ret; > + } > + return 0; > +} > + > +static int cros_ucsi_sync_control(struct ucsi *ucsi, u64 cmd) > +{ > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > + int ret; > + > + ret = ucsi_sync_control_common(ucsi, cmd); > + switch (ret) { > + case -EBUSY: > + /* EC may return -EBUSY if CCI.busy is set. > + * Convert this to a timeout. > + */ > + case -ETIMEDOUT: > + /* Schedule recovery attempt when we timeout > + * or tried to send a command while still busy. > + */ > + cancel_delayed_work_sync(&udata->write_tmo); > + schedule_delayed_work(&udata->write_tmo, > + msecs_to_jiffies(WRITE_TMO_MS)); > + break; > + case 0: > + /* Successful write. Cancel any pending recovery work. */ > + cancel_delayed_work_sync(&udata->write_tmo); > + break; > + } > + > + return ret; > +} > + > +struct ucsi_operations cros_ucsi_ops = { > + .read_version = cros_ucsi_read_version, > + .read_cci = cros_ucsi_read_cci, > + .read_message_in = cros_ucsi_read_message_in, > + .async_control = cros_ucsi_async_control, > + .sync_control = cros_ucsi_sync_control, > +}; > + > +static void cros_ucsi_work(struct work_struct *work) > +{ > + struct cros_ucsi_data *udata = container_of(work, struct cros_ucsi_data, work); > + u32 cci; > + > + if (cros_ucsi_read_cci(udata->ucsi, &cci)) > + return; > + > + ucsi_notify_common(udata->ucsi, cci); > +} > + > +static void cros_ucsi_write_timeout(struct work_struct *work) > +{ > + struct cros_ucsi_data *udata = > + container_of(work, struct cros_ucsi_data, write_tmo.work); > + u32 cci; > + u64 cmd; > + > + if (cros_ucsi_read(udata->ucsi, UCSI_CCI, &cci, sizeof(cci))) { > + dev_err(udata->dev, > + "Reading CCI failed; no write timeout recovery possible."); > + return; > + } > + > + if (cci & UCSI_CCI_BUSY) { > + udata->tmo_counter++; > + > + if (udata->tmo_counter <= WRITE_TMO_CTR_MAX) > + schedule_delayed_work(&udata->write_tmo, > + msecs_to_jiffies(WRITE_TMO_MS)); > + else > + dev_err(udata->dev, > + "PPM unresponsive - too many write timeouts."); > + > + return; > + } > + > + /* No longer busy means we can reset our timeout counter. */ > + udata->tmo_counter = 0; > + > + /* Need to ack previous command which may have timed out. */ > + if (cci & UCSI_CCI_COMMAND_COMPLETE) { > + cmd = UCSI_ACK_CC_CI | UCSI_ACK_COMMAND_COMPLETE; > + cros_ucsi_async_control(udata->ucsi, &cmd); > + > + /* Check again after a few seconds that the system has > + * recovered to make sure our async write above was successful. > + */ > + schedule_delayed_work(&udata->write_tmo, > + msecs_to_jiffies(WRITE_TMO_MS)); > + return; > + } > + > + /* We recovered from a previous timeout. Treat this as a recovery from > + * suspend and call resume. > + */ > + ucsi_resume(udata->ucsi); > +} > + > +static int cros_ucsi_event(struct notifier_block *nb, > + unsigned long host_event, void *_notify) > +{ > + struct cros_ucsi_data *udata = container_of(nb, struct cros_ucsi_data, nb); > + > + if (!(host_event & PD_EVENT_PPM)) > + return NOTIFY_OK; > + > + dev_dbg(udata->dev, "UCSI notification received"); > + flush_work(&udata->work); > + schedule_work(&udata->work); > + > + return NOTIFY_OK; > +} > + > +static void cros_ucsi_destroy(struct cros_ucsi_data *udata) > +{ > + cros_usbpd_unregister_notify(&udata->nb); > + cancel_delayed_work(&udata->write_tmo); > + cancel_work_sync(&udata->work); > + ucsi_destroy(udata->ucsi); > +} > + > +static int cros_ucsi_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct cros_ec_dev *ec_data = dev_get_drvdata(dev->parent); > + struct cros_ucsi_data *udata; > + int ret; > + > + udata = devm_kzalloc(dev, sizeof(*udata), GFP_KERNEL); > + if (!udata) > + return -ENOMEM; > + > + udata->dev = dev; > + > + udata->ec = ec_data->ec_dev; > + if (!udata->ec) { > + dev_err(dev, "couldn't find parent EC device"); > + return -ENODEV; > + } > + > + platform_set_drvdata(pdev, udata); > + > + INIT_WORK(&udata->work, cros_ucsi_work); > + INIT_DELAYED_WORK(&udata->write_tmo, cros_ucsi_write_timeout); > + init_completion(&udata->complete); > + > + udata->ucsi = ucsi_create(dev, &cros_ucsi_ops); > + if (IS_ERR(udata->ucsi)) { > + dev_err(dev, "failed to allocate UCSI instance"); > + return PTR_ERR(udata->ucsi); > + } > + > + ucsi_set_drvdata(udata->ucsi, udata); > + > + udata->nb.notifier_call = cros_ucsi_event; > + ret = cros_usbpd_register_notify(&udata->nb); > + if (ret) { > + dev_err(dev, "failed to register notifier: error=%d", ret); > + ucsi_destroy(udata->ucsi); > + return ret; > + } > + > + ret = ucsi_register(udata->ucsi); > + if (ret) { > + dev_err(dev, "failed to register UCSI: error=%d", ret); > + cros_ucsi_destroy(udata); > + return ret; > + } > + > + return 0; > +} > + > +static void cros_ucsi_remove(struct platform_device *dev) > +{ > + struct cros_ucsi_data *udata = platform_get_drvdata(dev); > + > + ucsi_unregister(udata->ucsi); > + cros_ucsi_destroy(udata); > +} > + > +static int __maybe_unused cros_ucsi_suspend(struct device *dev) > +{ > + struct cros_ucsi_data *udata = dev_get_drvdata(dev); > + > + cancel_delayed_work(&udata->write_tmo); > + cancel_work_sync(&udata->work); > + > + return 0; > +} > + > +static void __maybe_unused cros_ucsi_complete(struct device *dev) > +{ > + struct cros_ucsi_data *udata = dev_get_drvdata(dev); > + > + ucsi_resume(udata->ucsi); > +} > + > +/* > + * UCSI protocol is also used on ChromeOS platforms which reply on > + * cros_ec_lpc.c driver for communication with embedded controller (EC). > + * On such platforms communication with the EC is not available until > + * the .complete() callback of the cros_ec_lpc driver is executed. > + * For this reason we delay ucsi_resume() until the .complete() stage > + * otherwise UCSI SET_NOTIFICATION_ENABLE command will fail and we won't > + * receive any UCSI notifications from the EC where PPM is implemented. > + */ > +static const struct dev_pm_ops cros_ucsi_pm_ops = { > +#ifdef CONFIG_PM_SLEEP > + .suspend = cros_ucsi_suspend, > + .complete = cros_ucsi_complete, > +#endif > +}; > + > +static const struct platform_device_id cros_ucsi_id[] = { > + { KBUILD_MODNAME, 0 }, > + {} > +}; > +MODULE_DEVICE_TABLE(platform, cros_ucsi_id); > + > +static struct platform_driver cros_ucsi_driver = { > + .driver = { > + .name = KBUILD_MODNAME, > + .pm = &cros_ucsi_pm_ops, > + }, > + .id_table = cros_ucsi_id, > + .probe = cros_ucsi_probe, > + .remove = cros_ucsi_remove, > +}; > + > +module_platform_driver(cros_ucsi_driver); > + > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("UCSI driver for ChromeOS EC"); > -- > 2.47.0.338.g60cca15819-goog -- heikki ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver 2024-12-04 19:49 ` [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver Łukasz Bartosik 2024-12-05 14:48 ` Heikki Krogerus @ 2024-12-09 16:48 ` Abhishek Pandit-Subedi 2024-12-10 10:35 ` Łukasz Bartosik 1 sibling, 1 reply; 6+ messages in thread From: Abhishek Pandit-Subedi @ 2024-12-09 16:48 UTC (permalink / raw) To: Łukasz Bartosik Cc: Heikki Krogerus, Greg Kroah-Hartman, Benson Leung, Dmitry Baryshkov, Jameson Thies, Pavan Holla, Tzung-Bi Shih, linux-usb, chrome-platform On Wed, Dec 4, 2024 at 11:49 AM Łukasz Bartosik <ukaszb@chromium.org> wrote: > > From: Pavan Holla <pholla@chromium.org> > > Implementation of a UCSI transport driver for ChromeOS. > This driver will be loaded if the ChromeOS EC implements a PPM. > > Signed-off-by: Pavan Holla <pholla@chromium.org> > Co-developed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > Co-developed-by: Łukasz Bartosik <ukaszb@chromium.org> > Signed-off-by: Łukasz Bartosik <ukaszb@chromium.org> > --- > MAINTAINERS | 7 + > drivers/usb/typec/ucsi/Kconfig | 13 + > drivers/usb/typec/ucsi/Makefile | 1 + > drivers/usb/typec/ucsi/cros_ec_ucsi.c | 337 ++++++++++++++++++++++++++ > 4 files changed, 358 insertions(+) > create mode 100644 drivers/usb/typec/ucsi/cros_ec_ucsi.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 1e930c7a58b1..36eebe1ad078 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -5452,6 +5452,13 @@ L: chrome-platform@lists.linux.dev > S: Maintained > F: drivers/watchdog/cros_ec_wdt.c > > +CHROMEOS UCSI DRIVER > +M: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > +M: Łukasz Bartosik <ukaszb@chromium.org> > +L: chrome-platform@lists.linux.dev > +S: Maintained > +F: drivers/usb/typec/ucsi/cros_ec_ucsi.c > + > CHRONTEL CH7322 CEC DRIVER > M: Joe Tessler <jrt@google.com> > L: linux-media@vger.kernel.org > diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig > index 680e1b87b152..75559601fe8f 100644 > --- a/drivers/usb/typec/ucsi/Kconfig > +++ b/drivers/usb/typec/ucsi/Kconfig > @@ -69,6 +69,19 @@ config UCSI_PMIC_GLINK > To compile the driver as a module, choose M here: the module will be > called ucsi_glink. > > +config CROS_EC_UCSI > + tristate "UCSI Driver for ChromeOS EC" > + depends on MFD_CROS_EC_DEV > + depends on CROS_USBPD_NOTIFY > + depends on !EXTCON_TCSS_CROS_EC > + default MFD_CROS_EC_DEV > + help > + This driver enables UCSI support for a ChromeOS EC. The EC is > + expected to implement a PPM. > + > + To compile the driver as a module, choose M here: the module > + will be called cros_ec_ucsi. > + > config UCSI_LENOVO_YOGA_C630 > tristate "UCSI Interface Driver for Lenovo Yoga C630" > depends on EC_LENOVO_YOGA_C630 > diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile > index aed41d23887b..be98a879104d 100644 > --- a/drivers/usb/typec/ucsi/Makefile > +++ b/drivers/usb/typec/ucsi/Makefile > @@ -21,4 +21,5 @@ obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o > obj-$(CONFIG_UCSI_CCG) += ucsi_ccg.o > obj-$(CONFIG_UCSI_STM32G0) += ucsi_stm32g0.o > obj-$(CONFIG_UCSI_PMIC_GLINK) += ucsi_glink.o > +obj-$(CONFIG_CROS_EC_UCSI) += cros_ec_ucsi.o > obj-$(CONFIG_UCSI_LENOVO_YOGA_C630) += ucsi_yoga_c630.o > diff --git a/drivers/usb/typec/ucsi/cros_ec_ucsi.c b/drivers/usb/typec/ucsi/cros_ec_ucsi.c > new file mode 100644 > index 000000000000..cd2231d6a0ea > --- /dev/null > +++ b/drivers/usb/typec/ucsi/cros_ec_ucsi.c > @@ -0,0 +1,337 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * UCSI driver for ChromeOS EC > + * > + * Copyright 2024 Google LLC. > + */ > + > +#include <linux/container_of.h> > +#include <linux/dev_printk.h> > +#include <linux/jiffies.h> > +#include <linux/mod_devicetable.h> > +#include <linux/module.h> > +#include <linux/platform_data/cros_ec_commands.h> > +#include <linux/platform_data/cros_usbpd_notify.h> > +#include <linux/platform_data/cros_ec_proto.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > +#include <linux/wait.h> > + > +#include "ucsi.h" > + > +/* > + * Maximum size in bytes of a UCSI message between AP and EC > + */ > +#define MAX_EC_DATA_SIZE 256 > + > +/* > + * Maximum time in milliseconds the cros_ec_ucsi driver > + * will wait for a response to a command or and ack. > + */ > +#define WRITE_TMO_MS 5000 > + > +/* Number of times to attempt recovery from a write timeout before giving up. */ > +#define WRITE_TMO_CTR_MAX 5 > + > +struct cros_ucsi_data { > + struct device *dev; > + struct ucsi *ucsi; > + > + struct cros_ec_device *ec; > + struct notifier_block nb; > + struct work_struct work; > + struct delayed_work write_tmo; > + int tmo_counter; > + > + struct completion complete; > + unsigned long flags; > +}; > + > +static int cros_ucsi_read(struct ucsi *ucsi, unsigned int offset, void *val, > + size_t val_len) > +{ > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > + struct ec_params_ucsi_ppm_get req = { > + .offset = offset, > + .size = val_len, > + }; > + int ret; > + > + if (val_len > MAX_EC_DATA_SIZE) { > + dev_err(udata->dev, "Can't read %zu bytes. Too big.", val_len); > + return -EINVAL; > + } > + > + ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_GET, > + &req, sizeof(req), val, val_len); > + if (ret < 0) { > + dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_GET: error=%d", ret); > + return ret; > + } > + return 0; > +} > + > +static int cros_ucsi_read_version(struct ucsi *ucsi, u16 *version) > +{ > + return cros_ucsi_read(ucsi, UCSI_VERSION, version, sizeof(*version)); > +} > + > +static int cros_ucsi_read_cci(struct ucsi *ucsi, u32 *cci) > +{ > + return cros_ucsi_read(ucsi, UCSI_CCI, cci, sizeof(*cci)); > +} > + > +static int cros_ucsi_read_message_in(struct ucsi *ucsi, void *val, > + size_t val_len) > +{ > + return cros_ucsi_read(ucsi, UCSI_MESSAGE_IN, val, val_len); > +} > + > +static int cros_ucsi_async_control(struct ucsi *ucsi, u64 cmd) > +{ > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > + u8 ec_buf[sizeof(struct ec_params_ucsi_ppm_set) + sizeof(cmd)]; > + struct ec_params_ucsi_ppm_set *req = (struct ec_params_ucsi_ppm_set *) ec_buf; > + int ret; > + > + req->offset = UCSI_CONTROL; > + memcpy(req->data, &cmd, sizeof(cmd)); > + ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_SET, > + req, sizeof(ec_buf), NULL, 0); > + if (ret < 0) { > + dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_SET: error=%d", ret); > + return ret; > + } > + return 0; > +} > + > +static int cros_ucsi_sync_control(struct ucsi *ucsi, u64 cmd) > +{ > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > + int ret; > + > + ret = ucsi_sync_control_common(ucsi, cmd); > + switch (ret) { > + case -EBUSY: > + /* EC may return -EBUSY if CCI.busy is set. > + * Convert this to a timeout. > + */ > + case -ETIMEDOUT: > + /* Schedule recovery attempt when we timeout > + * or tried to send a command while still busy. > + */ > + cancel_delayed_work_sync(&udata->write_tmo); > + schedule_delayed_work(&udata->write_tmo, > + msecs_to_jiffies(WRITE_TMO_MS)); > + break; > + case 0: > + /* Successful write. Cancel any pending recovery work. */ > + cancel_delayed_work_sync(&udata->write_tmo); > + break; > + } > + > + return ret; > +} > + > +struct ucsi_operations cros_ucsi_ops = { > + .read_version = cros_ucsi_read_version, > + .read_cci = cros_ucsi_read_cci, > + .read_message_in = cros_ucsi_read_message_in, > + .async_control = cros_ucsi_async_control, > + .sync_control = cros_ucsi_sync_control, > +}; > + > +static void cros_ucsi_work(struct work_struct *work) > +{ > + struct cros_ucsi_data *udata = container_of(work, struct cros_ucsi_data, work); > + u32 cci; > + > + if (cros_ucsi_read_cci(udata->ucsi, &cci)) > + return; > + > + ucsi_notify_common(udata->ucsi, cci); > +} > + > +static void cros_ucsi_write_timeout(struct work_struct *work) > +{ > + struct cros_ucsi_data *udata = > + container_of(work, struct cros_ucsi_data, write_tmo.work); > + u32 cci; > + u64 cmd; > + > + if (cros_ucsi_read(udata->ucsi, UCSI_CCI, &cci, sizeof(cci))) { > + dev_err(udata->dev, > + "Reading CCI failed; no write timeout recovery possible."); > + return; > + } > + > + if (cci & UCSI_CCI_BUSY) { > + udata->tmo_counter++; > + > + if (udata->tmo_counter <= WRITE_TMO_CTR_MAX) > + schedule_delayed_work(&udata->write_tmo, > + msecs_to_jiffies(WRITE_TMO_MS)); > + else > + dev_err(udata->dev, > + "PPM unresponsive - too many write timeouts."); > + > + return; > + } > + > + /* No longer busy means we can reset our timeout counter. */ > + udata->tmo_counter = 0; > + > + /* Need to ack previous command which may have timed out. */ > + if (cci & UCSI_CCI_COMMAND_COMPLETE) { > + cmd = UCSI_ACK_CC_CI | UCSI_ACK_COMMAND_COMPLETE; > + cros_ucsi_async_control(udata->ucsi, &cmd); > + > + /* Check again after a few seconds that the system has > + * recovered to make sure our async write above was successful. > + */ > + schedule_delayed_work(&udata->write_tmo, > + msecs_to_jiffies(WRITE_TMO_MS)); > + return; > + } > + > + /* We recovered from a previous timeout. Treat this as a recovery from > + * suspend and call resume. > + */ > + ucsi_resume(udata->ucsi); > +} > + > +static int cros_ucsi_event(struct notifier_block *nb, > + unsigned long host_event, void *_notify) > +{ > + struct cros_ucsi_data *udata = container_of(nb, struct cros_ucsi_data, nb); > + > + if (!(host_event & PD_EVENT_PPM)) > + return NOTIFY_OK; > + > + dev_dbg(udata->dev, "UCSI notification received"); > + flush_work(&udata->work); > + schedule_work(&udata->work); > + > + return NOTIFY_OK; > +} > + > +static void cros_ucsi_destroy(struct cros_ucsi_data *udata) > +{ > + cros_usbpd_unregister_notify(&udata->nb); > + cancel_delayed_work(&udata->write_tmo); Prefer cancel_delayed_work_sync. > + cancel_work_sync(&udata->work); > + ucsi_destroy(udata->ucsi); > +} > + > +static int cros_ucsi_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct cros_ec_dev *ec_data = dev_get_drvdata(dev->parent); > + struct cros_ucsi_data *udata; > + int ret; > + > + udata = devm_kzalloc(dev, sizeof(*udata), GFP_KERNEL); > + if (!udata) > + return -ENOMEM; > + > + udata->dev = dev; > + > + udata->ec = ec_data->ec_dev; > + if (!udata->ec) { > + dev_err(dev, "couldn't find parent EC device"); > + return -ENODEV; > + } > + > + platform_set_drvdata(pdev, udata); > + > + INIT_WORK(&udata->work, cros_ucsi_work); > + INIT_DELAYED_WORK(&udata->write_tmo, cros_ucsi_write_timeout); > + init_completion(&udata->complete); > + > + udata->ucsi = ucsi_create(dev, &cros_ucsi_ops); > + if (IS_ERR(udata->ucsi)) { > + dev_err(dev, "failed to allocate UCSI instance"); > + return PTR_ERR(udata->ucsi); > + } > + > + ucsi_set_drvdata(udata->ucsi, udata); > + > + udata->nb.notifier_call = cros_ucsi_event; > + ret = cros_usbpd_register_notify(&udata->nb); > + if (ret) { > + dev_err(dev, "failed to register notifier: error=%d", ret); > + ucsi_destroy(udata->ucsi); > + return ret; > + } > + > + ret = ucsi_register(udata->ucsi); > + if (ret) { > + dev_err(dev, "failed to register UCSI: error=%d", ret); > + cros_ucsi_destroy(udata); > + return ret; > + } > + > + return 0; > +} > + > +static void cros_ucsi_remove(struct platform_device *dev) > +{ > + struct cros_ucsi_data *udata = platform_get_drvdata(dev); > + > + ucsi_unregister(udata->ucsi); > + cros_ucsi_destroy(udata); > +} > + > +static int __maybe_unused cros_ucsi_suspend(struct device *dev) > +{ > + struct cros_ucsi_data *udata = dev_get_drvdata(dev); > + > + cancel_delayed_work(&udata->write_tmo); This should probably be cancel_delayed_work_sync. Otherwise, the writes coming from that work item may cause an interrupt after this suspend method completes. > + cancel_work_sync(&udata->work); > + > + return 0; > +} > + > +static void __maybe_unused cros_ucsi_complete(struct device *dev) > +{ > + struct cros_ucsi_data *udata = dev_get_drvdata(dev); > + > + ucsi_resume(udata->ucsi); > +} > + > +/* > + * UCSI protocol is also used on ChromeOS platforms which reply on > + * cros_ec_lpc.c driver for communication with embedded controller (EC). > + * On such platforms communication with the EC is not available until > + * the .complete() callback of the cros_ec_lpc driver is executed. > + * For this reason we delay ucsi_resume() until the .complete() stage > + * otherwise UCSI SET_NOTIFICATION_ENABLE command will fail and we won't > + * receive any UCSI notifications from the EC where PPM is implemented. > + */ > +static const struct dev_pm_ops cros_ucsi_pm_ops = { > +#ifdef CONFIG_PM_SLEEP > + .suspend = cros_ucsi_suspend, > + .complete = cros_ucsi_complete, > +#endif > +}; > + > +static const struct platform_device_id cros_ucsi_id[] = { > + { KBUILD_MODNAME, 0 }, > + {} > +}; > +MODULE_DEVICE_TABLE(platform, cros_ucsi_id); > + > +static struct platform_driver cros_ucsi_driver = { > + .driver = { > + .name = KBUILD_MODNAME, > + .pm = &cros_ucsi_pm_ops, > + }, > + .id_table = cros_ucsi_id, > + .probe = cros_ucsi_probe, > + .remove = cros_ucsi_remove, > +}; > + > +module_platform_driver(cros_ucsi_driver); > + > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("UCSI driver for ChromeOS EC"); > -- > 2.47.0.338.g60cca15819-goog > ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver 2024-12-09 16:48 ` Abhishek Pandit-Subedi @ 2024-12-10 10:35 ` Łukasz Bartosik 0 siblings, 0 replies; 6+ messages in thread From: Łukasz Bartosik @ 2024-12-10 10:35 UTC (permalink / raw) To: Abhishek Pandit-Subedi, Heikki Krogerus Cc: Greg Kroah-Hartman, Benson Leung, Dmitry Baryshkov, Jameson Thies, Pavan Holla, Tzung-Bi Shih, linux-usb, chrome-platform On Mon, Dec 9, 2024 at 5:48 PM Abhishek Pandit-Subedi <abhishekpandit@chromium.org> wrote: > > On Wed, Dec 4, 2024 at 11:49 AM Łukasz Bartosik <ukaszb@chromium.org> wrote: > > > > From: Pavan Holla <pholla@chromium.org> > > > > Implementation of a UCSI transport driver for ChromeOS. > > This driver will be loaded if the ChromeOS EC implements a PPM. > > > > Signed-off-by: Pavan Holla <pholla@chromium.org> > > Co-developed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > > Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > > Co-developed-by: Łukasz Bartosik <ukaszb@chromium.org> > > Signed-off-by: Łukasz Bartosik <ukaszb@chromium.org> > > --- > > MAINTAINERS | 7 + > > drivers/usb/typec/ucsi/Kconfig | 13 + > > drivers/usb/typec/ucsi/Makefile | 1 + > > drivers/usb/typec/ucsi/cros_ec_ucsi.c | 337 ++++++++++++++++++++++++++ > > 4 files changed, 358 insertions(+) > > create mode 100644 drivers/usb/typec/ucsi/cros_ec_ucsi.c > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index 1e930c7a58b1..36eebe1ad078 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -5452,6 +5452,13 @@ L: chrome-platform@lists.linux.dev > > S: Maintained > > F: drivers/watchdog/cros_ec_wdt.c > > > > +CHROMEOS UCSI DRIVER > > +M: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> > > +M: Łukasz Bartosik <ukaszb@chromium.org> > > +L: chrome-platform@lists.linux.dev > > +S: Maintained > > +F: drivers/usb/typec/ucsi/cros_ec_ucsi.c > > + > > CHRONTEL CH7322 CEC DRIVER > > M: Joe Tessler <jrt@google.com> > > L: linux-media@vger.kernel.org > > diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig > > index 680e1b87b152..75559601fe8f 100644 > > --- a/drivers/usb/typec/ucsi/Kconfig > > +++ b/drivers/usb/typec/ucsi/Kconfig > > @@ -69,6 +69,19 @@ config UCSI_PMIC_GLINK > > To compile the driver as a module, choose M here: the module will be > > called ucsi_glink. > > > > +config CROS_EC_UCSI > > + tristate "UCSI Driver for ChromeOS EC" > > + depends on MFD_CROS_EC_DEV > > + depends on CROS_USBPD_NOTIFY > > + depends on !EXTCON_TCSS_CROS_EC > > + default MFD_CROS_EC_DEV > > + help > > + This driver enables UCSI support for a ChromeOS EC. The EC is > > + expected to implement a PPM. > > + > > + To compile the driver as a module, choose M here: the module > > + will be called cros_ec_ucsi. > > + > > config UCSI_LENOVO_YOGA_C630 > > tristate "UCSI Interface Driver for Lenovo Yoga C630" > > depends on EC_LENOVO_YOGA_C630 > > diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile > > index aed41d23887b..be98a879104d 100644 > > --- a/drivers/usb/typec/ucsi/Makefile > > +++ b/drivers/usb/typec/ucsi/Makefile > > @@ -21,4 +21,5 @@ obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o > > obj-$(CONFIG_UCSI_CCG) += ucsi_ccg.o > > obj-$(CONFIG_UCSI_STM32G0) += ucsi_stm32g0.o > > obj-$(CONFIG_UCSI_PMIC_GLINK) += ucsi_glink.o > > +obj-$(CONFIG_CROS_EC_UCSI) += cros_ec_ucsi.o > > obj-$(CONFIG_UCSI_LENOVO_YOGA_C630) += ucsi_yoga_c630.o > > diff --git a/drivers/usb/typec/ucsi/cros_ec_ucsi.c b/drivers/usb/typec/ucsi/cros_ec_ucsi.c > > new file mode 100644 > > index 000000000000..cd2231d6a0ea > > --- /dev/null > > +++ b/drivers/usb/typec/ucsi/cros_ec_ucsi.c > > @@ -0,0 +1,337 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * UCSI driver for ChromeOS EC > > + * > > + * Copyright 2024 Google LLC. > > + */ > > + > > +#include <linux/container_of.h> > > +#include <linux/dev_printk.h> > > +#include <linux/jiffies.h> > > +#include <linux/mod_devicetable.h> > > +#include <linux/module.h> > > +#include <linux/platform_data/cros_ec_commands.h> > > +#include <linux/platform_data/cros_usbpd_notify.h> > > +#include <linux/platform_data/cros_ec_proto.h> > > +#include <linux/platform_device.h> > > +#include <linux/slab.h> > > +#include <linux/wait.h> > > + > > +#include "ucsi.h" > > + > > +/* > > + * Maximum size in bytes of a UCSI message between AP and EC > > + */ > > +#define MAX_EC_DATA_SIZE 256 > > + > > +/* > > + * Maximum time in milliseconds the cros_ec_ucsi driver > > + * will wait for a response to a command or and ack. > > + */ > > +#define WRITE_TMO_MS 5000 > > + > > +/* Number of times to attempt recovery from a write timeout before giving up. */ > > +#define WRITE_TMO_CTR_MAX 5 > > + > > +struct cros_ucsi_data { > > + struct device *dev; > > + struct ucsi *ucsi; > > + > > + struct cros_ec_device *ec; > > + struct notifier_block nb; > > + struct work_struct work; > > + struct delayed_work write_tmo; > > + int tmo_counter; > > + > > + struct completion complete; > > + unsigned long flags; > > +}; > > + > > +static int cros_ucsi_read(struct ucsi *ucsi, unsigned int offset, void *val, > > + size_t val_len) > > +{ > > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > > + struct ec_params_ucsi_ppm_get req = { > > + .offset = offset, > > + .size = val_len, > > + }; > > + int ret; > > + > > + if (val_len > MAX_EC_DATA_SIZE) { > > + dev_err(udata->dev, "Can't read %zu bytes. Too big.", val_len); > > + return -EINVAL; > > + } > > + > > + ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_GET, > > + &req, sizeof(req), val, val_len); > > + if (ret < 0) { > > + dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_GET: error=%d", ret); > > + return ret; > > + } > > + return 0; > > +} > > + > > +static int cros_ucsi_read_version(struct ucsi *ucsi, u16 *version) > > +{ > > + return cros_ucsi_read(ucsi, UCSI_VERSION, version, sizeof(*version)); > > +} > > + > > +static int cros_ucsi_read_cci(struct ucsi *ucsi, u32 *cci) > > +{ > > + return cros_ucsi_read(ucsi, UCSI_CCI, cci, sizeof(*cci)); > > +} > > + > > +static int cros_ucsi_read_message_in(struct ucsi *ucsi, void *val, > > + size_t val_len) > > +{ > > + return cros_ucsi_read(ucsi, UCSI_MESSAGE_IN, val, val_len); > > +} > > + > > +static int cros_ucsi_async_control(struct ucsi *ucsi, u64 cmd) > > +{ > > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > > + u8 ec_buf[sizeof(struct ec_params_ucsi_ppm_set) + sizeof(cmd)]; > > + struct ec_params_ucsi_ppm_set *req = (struct ec_params_ucsi_ppm_set *) ec_buf; > > + int ret; > > + > > + req->offset = UCSI_CONTROL; > > + memcpy(req->data, &cmd, sizeof(cmd)); > > + ret = cros_ec_cmd(udata->ec, 0, EC_CMD_UCSI_PPM_SET, > > + req, sizeof(ec_buf), NULL, 0); > > + if (ret < 0) { > > + dev_warn(udata->dev, "Failed to send EC message UCSI_PPM_SET: error=%d", ret); > > + return ret; > > + } > > + return 0; > > +} > > + > > +static int cros_ucsi_sync_control(struct ucsi *ucsi, u64 cmd) > > +{ > > + struct cros_ucsi_data *udata = ucsi_get_drvdata(ucsi); > > + int ret; > > + > > + ret = ucsi_sync_control_common(ucsi, cmd); > > + switch (ret) { > > + case -EBUSY: > > + /* EC may return -EBUSY if CCI.busy is set. > > + * Convert this to a timeout. > > + */ > > + case -ETIMEDOUT: > > + /* Schedule recovery attempt when we timeout > > + * or tried to send a command while still busy. > > + */ > > + cancel_delayed_work_sync(&udata->write_tmo); > > + schedule_delayed_work(&udata->write_tmo, > > + msecs_to_jiffies(WRITE_TMO_MS)); > > + break; > > + case 0: > > + /* Successful write. Cancel any pending recovery work. */ > > + cancel_delayed_work_sync(&udata->write_tmo); > > + break; > > + } > > + > > + return ret; > > +} > > + > > +struct ucsi_operations cros_ucsi_ops = { > > + .read_version = cros_ucsi_read_version, > > + .read_cci = cros_ucsi_read_cci, > > + .read_message_in = cros_ucsi_read_message_in, > > + .async_control = cros_ucsi_async_control, > > + .sync_control = cros_ucsi_sync_control, > > +}; > > + > > +static void cros_ucsi_work(struct work_struct *work) > > +{ > > + struct cros_ucsi_data *udata = container_of(work, struct cros_ucsi_data, work); > > + u32 cci; > > + > > + if (cros_ucsi_read_cci(udata->ucsi, &cci)) > > + return; > > + > > + ucsi_notify_common(udata->ucsi, cci); > > +} > > + > > +static void cros_ucsi_write_timeout(struct work_struct *work) > > +{ > > + struct cros_ucsi_data *udata = > > + container_of(work, struct cros_ucsi_data, write_tmo.work); > > + u32 cci; > > + u64 cmd; > > + > > + if (cros_ucsi_read(udata->ucsi, UCSI_CCI, &cci, sizeof(cci))) { > > + dev_err(udata->dev, > > + "Reading CCI failed; no write timeout recovery possible."); > > + return; > > + } > > + > > + if (cci & UCSI_CCI_BUSY) { > > + udata->tmo_counter++; > > + > > + if (udata->tmo_counter <= WRITE_TMO_CTR_MAX) > > + schedule_delayed_work(&udata->write_tmo, > > + msecs_to_jiffies(WRITE_TMO_MS)); > > + else > > + dev_err(udata->dev, > > + "PPM unresponsive - too many write timeouts."); > > + > > + return; > > + } > > + > > + /* No longer busy means we can reset our timeout counter. */ > > + udata->tmo_counter = 0; > > + > > + /* Need to ack previous command which may have timed out. */ > > + if (cci & UCSI_CCI_COMMAND_COMPLETE) { > > + cmd = UCSI_ACK_CC_CI | UCSI_ACK_COMMAND_COMPLETE; > > + cros_ucsi_async_control(udata->ucsi, &cmd); > > + > > + /* Check again after a few seconds that the system has > > + * recovered to make sure our async write above was successful. > > + */ > > + schedule_delayed_work(&udata->write_tmo, > > + msecs_to_jiffies(WRITE_TMO_MS)); > > + return; > > + } > > + > > + /* We recovered from a previous timeout. Treat this as a recovery from > > + * suspend and call resume. > > + */ > > + ucsi_resume(udata->ucsi); > > +} > > + > > +static int cros_ucsi_event(struct notifier_block *nb, > > + unsigned long host_event, void *_notify) > > +{ > > + struct cros_ucsi_data *udata = container_of(nb, struct cros_ucsi_data, nb); > > + > > + if (!(host_event & PD_EVENT_PPM)) > > + return NOTIFY_OK; > > + > > + dev_dbg(udata->dev, "UCSI notification received"); > > + flush_work(&udata->work); > > + schedule_work(&udata->work); > > + > > + return NOTIFY_OK; > > +} > > + > > +static void cros_ucsi_destroy(struct cros_ucsi_data *udata) > > +{ > > + cros_usbpd_unregister_notify(&udata->nb); > > + cancel_delayed_work(&udata->write_tmo); > > Prefer cancel_delayed_work_sync. > > > + cancel_work_sync(&udata->work); > > + ucsi_destroy(udata->ucsi); > > +} > > + > > +static int cros_ucsi_probe(struct platform_device *pdev) > > +{ > > + struct device *dev = &pdev->dev; > > + struct cros_ec_dev *ec_data = dev_get_drvdata(dev->parent); > > + struct cros_ucsi_data *udata; > > + int ret; > > + > > + udata = devm_kzalloc(dev, sizeof(*udata), GFP_KERNEL); > > + if (!udata) > > + return -ENOMEM; > > + > > + udata->dev = dev; > > + > > + udata->ec = ec_data->ec_dev; > > + if (!udata->ec) { > > + dev_err(dev, "couldn't find parent EC device"); > > + return -ENODEV; > > + } > > + > > + platform_set_drvdata(pdev, udata); > > + > > + INIT_WORK(&udata->work, cros_ucsi_work); > > + INIT_DELAYED_WORK(&udata->write_tmo, cros_ucsi_write_timeout); > > + init_completion(&udata->complete); > > + > > + udata->ucsi = ucsi_create(dev, &cros_ucsi_ops); > > + if (IS_ERR(udata->ucsi)) { > > + dev_err(dev, "failed to allocate UCSI instance"); > > + return PTR_ERR(udata->ucsi); > > + } > > + > > + ucsi_set_drvdata(udata->ucsi, udata); > > + > > + udata->nb.notifier_call = cros_ucsi_event; > > + ret = cros_usbpd_register_notify(&udata->nb); > > + if (ret) { > > + dev_err(dev, "failed to register notifier: error=%d", ret); > > + ucsi_destroy(udata->ucsi); > > + return ret; > > + } > > + > > + ret = ucsi_register(udata->ucsi); > > + if (ret) { > > + dev_err(dev, "failed to register UCSI: error=%d", ret); > > + cros_ucsi_destroy(udata); > > + return ret; > > + } > > + > > + return 0; > > +} > > + > > +static void cros_ucsi_remove(struct platform_device *dev) > > +{ > > + struct cros_ucsi_data *udata = platform_get_drvdata(dev); > > + > > + ucsi_unregister(udata->ucsi); > > + cros_ucsi_destroy(udata); > > +} > > + > > +static int __maybe_unused cros_ucsi_suspend(struct device *dev) > > +{ > > + struct cros_ucsi_data *udata = dev_get_drvdata(dev); > > + > > + cancel_delayed_work(&udata->write_tmo); > > This should probably be cancel_delayed_work_sync. Otherwise, the > writes coming from that work item may cause an interrupt after this > suspend method completes. > You're right. I need to send the next patchset version then. Stay tuned ;). Thanks, Lukasz > > + cancel_work_sync(&udata->work); > > + > > + return 0; > > +} > > + > > +static void __maybe_unused cros_ucsi_complete(struct device *dev) > > +{ > > + struct cros_ucsi_data *udata = dev_get_drvdata(dev); > > + > > + ucsi_resume(udata->ucsi); > > +} > > + > > +/* > > + * UCSI protocol is also used on ChromeOS platforms which reply on > > + * cros_ec_lpc.c driver for communication with embedded controller (EC). > > + * On such platforms communication with the EC is not available until > > + * the .complete() callback of the cros_ec_lpc driver is executed. > > + * For this reason we delay ucsi_resume() until the .complete() stage > > + * otherwise UCSI SET_NOTIFICATION_ENABLE command will fail and we won't > > + * receive any UCSI notifications from the EC where PPM is implemented. > > + */ > > +static const struct dev_pm_ops cros_ucsi_pm_ops = { > > +#ifdef CONFIG_PM_SLEEP > > + .suspend = cros_ucsi_suspend, > > + .complete = cros_ucsi_complete, > > +#endif > > +}; > > + > > +static const struct platform_device_id cros_ucsi_id[] = { > > + { KBUILD_MODNAME, 0 }, > > + {} > > +}; > > +MODULE_DEVICE_TABLE(platform, cros_ucsi_id); > > + > > +static struct platform_driver cros_ucsi_driver = { > > + .driver = { > > + .name = KBUILD_MODNAME, > > + .pm = &cros_ucsi_pm_ops, > > + }, > > + .id_table = cros_ucsi_id, > > + .probe = cros_ucsi_probe, > > + .remove = cros_ucsi_remove, > > +}; > > + > > +module_platform_driver(cros_ucsi_driver); > > + > > +MODULE_LICENSE("GPL"); > > +MODULE_DESCRIPTION("UCSI driver for ChromeOS EC"); > > -- > > 2.47.0.338.g60cca15819-goog > > ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2024-12-10 10:36 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2024-12-04 19:48 [PATCH v10 0/2] usb: typec: Implement UCSI driver for ChromeOS Łukasz Bartosik 2024-12-04 19:48 ` [PATCH v10 1/2] platform/chrome: Update ChromeOS EC header for UCSI Łukasz Bartosik 2024-12-04 19:49 ` [PATCH v10 2/2] usb: typec: ucsi: Implement ChromeOS UCSI driver Łukasz Bartosik 2024-12-05 14:48 ` Heikki Krogerus 2024-12-09 16:48 ` Abhishek Pandit-Subedi 2024-12-10 10:35 ` Łukasz Bartosik
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