Re: [PATCH v1 2/6] mfd: cros_ec: Add MKBP event support

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[Resend[We should not used kmalloc when get events, these functions
are called quite often.
Gwendal.

On Fri, Feb 5, 2016 at 5:32 AM, Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx> wrote:
> From: Vic Yang <victoryang@xxxxxxxxxx>
>
> Newer revisions of the ChromeOS EC add more events besides the keyboard
> ones. So handle interrupts in the MFD driver and let consumers register
> for notifications for the events they might care.
>
> To keep backward compatibility, if the EC doesn't support MKBP event, we
> fall back to the old MKBP key matrix host command.
>
> Signed-off-by: Vic Yang <victoryang@xxxxxxxxxxxx>
> [bleung: fixup some context changes going from v3.14 to v3.18]
> Signed-off-by: Benson Leung <bleung@xxxxxxxxxxxx>
> [tomeu: adapted to changes in mainline (in power-supply and platform/chrome)]
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
> Cc: Randall Spangler <rspangler@xxxxxxxxxxxx>
> Cc: Vincent Palatin <vpalatin@xxxxxxxxxxxx>
>
> ---
>
>  drivers/input/keyboard/cros_ec_keyb.c   | 135 ++++++++------------------------
>  drivers/mfd/cros_ec.c                   |  57 +++++++++++++-
>  drivers/platform/chrome/cros_ec_proto.c | 102 ++++++++++++++++++++++++
>  include/linux/mfd/cros_ec.h             |  44 +++++++++++
>  include/linux/mfd/cros_ec_commands.h    |  34 ++++++++
>  5 files changed, 265 insertions(+), 107 deletions(-)
>
> diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
> index b01966dc7eb3..b891503143dc 100644
> --- a/drivers/input/keyboard/cros_ec_keyb.c
> +++ b/drivers/input/keyboard/cros_ec_keyb.c
> @@ -27,6 +27,7 @@
>  #include <linux/input.h>
>  #include <linux/interrupt.h>
>  #include <linux/kernel.h>
> +#include <linux/notifier.h>
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
>  #include <linux/input/matrix_keypad.h>
> @@ -44,6 +45,7 @@
>   * @dev: Device pointer
>   * @idev: Input device
>   * @ec: Top level ChromeOS device to use to talk to EC
> + * @notifier: interrupt event notifier for transport devices
>   */
>  struct cros_ec_keyb {
>         unsigned int rows;
> @@ -57,6 +59,7 @@ struct cros_ec_keyb {
>         struct device *dev;
>         struct input_dev *idev;
>         struct cros_ec_device *ec;
> +       struct notifier_block notifier;
>  };
>
>
> @@ -146,67 +149,44 @@ static void cros_ec_keyb_process(struct cros_ec_keyb *ckdev,
>         input_sync(ckdev->idev);
>  }
>
> -static int cros_ec_keyb_get_state(struct cros_ec_keyb *ckdev, uint8_t *kb_state)
> -{
> -       int ret = 0;
> -       struct cros_ec_command *msg;
> -
> -       msg = kmalloc(sizeof(*msg) + ckdev->cols, GFP_KERNEL);
> -       if (!msg)
> -               return -ENOMEM;
> -
> -       msg->version = 0;
> -       msg->command = EC_CMD_MKBP_STATE;
> -       msg->insize = ckdev->cols;
> -       msg->outsize = 0;
> -
> -       ret = cros_ec_cmd_xfer(ckdev->ec, msg);
> -       if (ret < 0) {
> -               dev_err(ckdev->dev, "Error transferring EC message %d\n", ret);
> -               goto exit;
> -       }
> -
> -       memcpy(kb_state, msg->data, ckdev->cols);
> -exit:
> -       kfree(msg);
> -       return ret;
> -}
> -
> -static irqreturn_t cros_ec_keyb_irq(int irq, void *data)
> +static int cros_ec_keyb_open(struct input_dev *dev)
>  {
> -       struct cros_ec_keyb *ckdev = data;
> -       struct cros_ec_device *ec = ckdev->ec;
> -       int ret;
> -       uint8_t kb_state[ckdev->cols];
> -
> -       if (device_may_wakeup(ec->dev))
> -               pm_wakeup_event(ec->dev, 0);
> -
> -       ret = cros_ec_keyb_get_state(ckdev, kb_state);
> -       if (ret >= 0)
> -               cros_ec_keyb_process(ckdev, kb_state, ret);
> -       else
> -               dev_err(ec->dev, "failed to get keyboard state: %d\n", ret);
> +       struct cros_ec_keyb *ckdev = input_get_drvdata(dev);
>
> -       return IRQ_HANDLED;
> +       return blocking_notifier_chain_register(&ckdev->ec->event_notifier,
> +                                               &ckdev->notifier);
>  }
>
> -static int cros_ec_keyb_open(struct input_dev *dev)
> +static void cros_ec_keyb_close(struct input_dev *dev)
>  {
>         struct cros_ec_keyb *ckdev = input_get_drvdata(dev);
> -       struct cros_ec_device *ec = ckdev->ec;
>
> -       return request_threaded_irq(ec->irq, NULL, cros_ec_keyb_irq,
> -                                       IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> -                                       "cros_ec_keyb", ckdev);
> +       blocking_notifier_chain_unregister(&ckdev->ec->event_notifier,
> +                                          &ckdev->notifier);
>  }
>
> -static void cros_ec_keyb_close(struct input_dev *dev)
> +static int cros_ec_keyb_work(struct notifier_block *nb,
> +                            unsigned long queued_during_suspend, void *_notify)
>  {
> -       struct cros_ec_keyb *ckdev = input_get_drvdata(dev);
> -       struct cros_ec_device *ec = ckdev->ec;
> +       struct cros_ec_keyb *ckdev = container_of(nb, struct cros_ec_keyb,
> +                                                 notifier);
>
> -       free_irq(ec->irq, ckdev);
> +       if (ckdev->ec->event_data.event_type != EC_MKBP_EVENT_KEY_MATRIX)
> +               return NOTIFY_DONE;
> +       /*
> +        * If EC is not the wake source, discard key state changes during
> +        * suspend.
> +        */
> +       if (queued_during_suspend)
> +               return NOTIFY_OK;
> +       if (ckdev->ec->event_size != ckdev->cols) {
> +               dev_err(ckdev->dev,
> +                       "Discarded incomplete key matrix event.\n");
> +               return NOTIFY_OK;
> +       }
> +       cros_ec_keyb_process(ckdev, ckdev->ec->event_data.data.key_matrix,
> +                            ckdev->ec->event_size);
> +       return NOTIFY_OK;
>  }
>
>  /*
> @@ -266,12 +246,8 @@ static int cros_ec_keyb_probe(struct platform_device *pdev)
>         if (!idev)
>                 return -ENOMEM;
>
> -       if (!ec->irq) {
> -               dev_err(dev, "no EC IRQ specified\n");
> -               return -EINVAL;
> -       }
> -
>         ckdev->ec = ec;
> +       ckdev->notifier.notifier_call = cros_ec_keyb_work;
>         ckdev->dev = dev;
>         dev_set_drvdata(&pdev->dev, ckdev);
>
> @@ -312,54 +288,6 @@ static int cros_ec_keyb_probe(struct platform_device *pdev)
>         return 0;
>  }
>
> -#ifdef CONFIG_PM_SLEEP
> -/* Clear any keys in the buffer */
> -static void cros_ec_keyb_clear_keyboard(struct cros_ec_keyb *ckdev)
> -{
> -       uint8_t old_state[ckdev->cols];
> -       uint8_t new_state[ckdev->cols];
> -       unsigned long duration;
> -       int i, ret;
> -
> -       /*
> -        * Keep reading until we see that the scan state does not change.
> -        * That indicates that we are done.
> -        *
> -        * Assume that the EC keyscan buffer is at most 32 deep.
> -        */
> -       duration = jiffies;
> -       ret = cros_ec_keyb_get_state(ckdev, new_state);
> -       for (i = 1; !ret && i < 32; i++) {
> -               memcpy(old_state, new_state, sizeof(old_state));
> -               ret = cros_ec_keyb_get_state(ckdev, new_state);
> -               if (0 == memcmp(old_state, new_state, sizeof(old_state)))
> -                       break;
> -       }
> -       duration = jiffies - duration;
> -       dev_info(ckdev->dev, "Discarded %d keyscan(s) in %dus\n", i,
> -               jiffies_to_usecs(duration));
> -}
> -
> -static int cros_ec_keyb_resume(struct device *dev)
> -{
> -       struct cros_ec_keyb *ckdev = dev_get_drvdata(dev);
> -
> -       /*
> -        * When the EC is not a wake source, then it could not have caused the
> -        * resume, so we clear the EC's key scan buffer. If the EC was a
> -        * wake source (e.g. the lid is open and the user might press a key to
> -        * wake) then the key scan buffer should be preserved.
> -        */
> -       if (!ckdev->ec->was_wake_device)
> -               cros_ec_keyb_clear_keyboard(ckdev);
> -
> -       return 0;
> -}
> -
> -#endif
> -
> -static SIMPLE_DEV_PM_OPS(cros_ec_keyb_pm_ops, NULL, cros_ec_keyb_resume);
> -
>  #ifdef CONFIG_OF
>  static const struct of_device_id cros_ec_keyb_of_match[] = {
>         { .compatible = "google,cros-ec-keyb" },
> @@ -373,7 +301,6 @@ static struct platform_driver cros_ec_keyb_driver = {
>         .driver = {
>                 .name = "cros-ec-keyb",
>                 .of_match_table = of_match_ptr(cros_ec_keyb_of_match),
> -               .pm     = &cros_ec_keyb_pm_ops,
>         },
>  };
>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index 0eee63542038..fbe78b819fdd 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -23,6 +23,7 @@
>  #include <linux/module.h>
>  #include <linux/mfd/core.h>
>  #include <linux/mfd/cros_ec.h>
> +#include <asm/unaligned.h>
>
>  #define CROS_EC_DEV_EC_INDEX 0
>  #define CROS_EC_DEV_PD_INDEX 1
> @@ -49,11 +50,28 @@ static const struct mfd_cell ec_pd_cell = {
>         .pdata_size = sizeof(pd_p),
>  };
>
> +static irqreturn_t ec_irq_thread(int irq, void *data)
> +{
> +       struct cros_ec_device *ec_dev = data;
> +       int ret;
> +
> +       if (device_may_wakeup(ec_dev->dev))
> +               pm_wakeup_event(ec_dev->dev, 0);
> +
> +       ret = cros_ec_get_next_event(ec_dev);
> +       if (ret > 0)
> +               blocking_notifier_call_chain(&ec_dev->event_notifier,
> +                                            0, ec_dev);
> +       return IRQ_HANDLED;
> +}
> +
>  int cros_ec_register(struct cros_ec_device *ec_dev)
>  {
>         struct device *dev = ec_dev->dev;
>         int err = 0;
>
> +       BLOCKING_INIT_NOTIFIER_HEAD(&ec_dev->event_notifier);
> +
>         ec_dev->max_request = sizeof(struct ec_params_hello);
>         ec_dev->max_response = sizeof(struct ec_response_get_protocol_info);
>         ec_dev->max_passthru = 0;
> @@ -70,13 +88,24 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>
>         cros_ec_query_all(ec_dev);
>
> +       if (ec_dev->irq) {
> +               err = request_threaded_irq(ec_dev->irq, NULL, ec_irq_thread,
> +                                          IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> +                                          "chromeos-ec", ec_dev);
> +               if (err) {
> +                       dev_err(dev, "request irq %d: error %d\n",
> +                               ec_dev->irq, err);
> +                       return err;
> +               }
> +       }
> +
>         err = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, &ec_cell, 1,
>                               NULL, ec_dev->irq, NULL);
>         if (err) {
>                 dev_err(dev,
>                         "Failed to register Embedded Controller subdevice %d\n",
>                         err);
> -               return err;
> +               goto fail_mfd;
>         }
>
>         if (ec_dev->max_passthru) {
> @@ -94,7 +123,7 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>                         dev_err(dev,
>                                 "Failed to register Power Delivery subdevice %d\n",
>                                 err);
> -                       return err;
> +                       goto fail_mfd;
>                 }
>         }
>
> @@ -103,13 +132,18 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>                 if (err) {
>                         mfd_remove_devices(dev);
>                         dev_err(dev, "Failed to register sub-devices\n");
> -                       return err;
> +                       goto fail_mfd;
>                 }
>         }
>
>         dev_info(dev, "Chrome EC device registered\n");
>
>         return 0;
> +
> +fail_mfd:
> +       if (ec_dev->irq)
> +               free_irq(ec_dev->irq, ec_dev);
> +       return err;
>  }
>  EXPORT_SYMBOL(cros_ec_register);
>
> @@ -136,13 +170,30 @@ int cros_ec_suspend(struct cros_ec_device *ec_dev)
>  }
>  EXPORT_SYMBOL(cros_ec_suspend);
>
> +static void cros_ec_drain_events(struct cros_ec_device *ec_dev)
> +{
> +       while (cros_ec_get_next_event(ec_dev) > 0)
> +               blocking_notifier_call_chain(&ec_dev->event_notifier,
> +                                            1, ec_dev);
> +}
> +
>  int cros_ec_resume(struct cros_ec_device *ec_dev)
>  {
>         enable_irq(ec_dev->irq);
>
> +       /*
> +        * In some case, we need to distinguish events that occur during
> +        * suspend if the EC is not a wake source. For example, keypresses
> +        * during suspend should be discarded if it does not wake the system.
> +        *
> +        * If the EC is not a wake source, drain the event queue and mark them
> +        * as "queued during suspend".
> +        */
>         if (ec_dev->wake_enabled) {
>                 disable_irq_wake(ec_dev->irq);
>                 ec_dev->wake_enabled = 0;
> +       } else {
> +               cros_ec_drain_events(ec_dev);
>         }
>
>         return 0;
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index 990308ca384f..6e138e2333f3 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -19,6 +19,7 @@
>  #include <linux/device.h>
>  #include <linux/module.h>
>  #include <linux/slab.h>
> +#include <asm/unaligned.h>
>
>  #define EC_COMMAND_RETRIES     50
>
> @@ -234,11 +235,44 @@ static int cros_ec_host_command_proto_query_v2(struct cros_ec_device *ec_dev)
>         return ret;
>  }
>
> +static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
> +       u16 cmd, u32 *mask)
> +{
> +       struct ec_params_get_cmd_versions *pver;
> +       struct ec_response_get_cmd_versions *rver;
> +       struct cros_ec_command *msg;
> +       int ret;
> +
> +       msg = kmalloc(sizeof(*msg) + max(sizeof(rver), sizeof(pver)),
> +                     GFP_KERNEL);
Victor's version in https://chromium-review.googlesource.com/272954
looks cleaner: no malloc, no need to cast rver.
> +       if (!msg)
> +               return -ENOMEM;
> +
> +       msg->version = 0;
> +       msg->command = EC_CMD_GET_CMD_VERSIONS;
> +       msg->insize = sizeof(rver);
> +       msg->outsize = sizeof(pver);
> +
> +       pver = (struct ec_params_get_cmd_versions *)msg->data;
> +       pver->cmd = cmd;
> +
> +       ret = cros_ec_cmd_xfer(ec_dev, msg);
> +       if (ret > 0) {
> +               rver = (struct ec_response_get_cmd_versions *)msg->data;
> +               *mask = rver->version_mask;
> +       }
> +
> +       kfree(msg);
> +
> +       return ret;
> +}
> +
>  int cros_ec_query_all(struct cros_ec_device *ec_dev)
>  {
>         struct device *dev = ec_dev->dev;
>         struct cros_ec_command *proto_msg;
>         struct ec_response_get_protocol_info *proto_info;
> +       u32 ver_mask = 0;
>         int ret;
>
>         proto_msg = kzalloc(sizeof(*proto_msg) + sizeof(*proto_info),
> @@ -328,6 +362,15 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev)
>                 goto exit;
>         }
>
> +       /* Probe if MKBP event is supported */
> +       ret = cros_ec_get_host_command_version_mask(ec_dev,
> +                                                   EC_CMD_GET_NEXT_EVENT,
> +                                                   &ver_mask);
> +       if (ret < 0 || ver_mask == 0)
> +               ec_dev->mkbp_event_supported = 0;
> +       else
> +               ec_dev->mkbp_event_supported = 1;
> +
>  exit:
>         kfree(proto_msg);
>         return ret;
> @@ -380,3 +423,62 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
>         return ret;
>  }
>  EXPORT_SYMBOL(cros_ec_cmd_xfer);
> +
> +static int get_next_event(struct cros_ec_device *ec_dev)
> +{
> +       struct cros_ec_command *msg;
> +       int ret;
> +
> +       msg = kmalloc(sizeof(*msg) + sizeof(ec_dev->event_data), GFP_KERNEL);
Same grip about malloc(). This function will be called very often when
sensors are used.
> +       if (!msg)
> +               return -ENOMEM;
> +
> +       msg->version = 0;
> +       msg->command = EC_CMD_GET_NEXT_EVENT;
> +       msg->insize = sizeof(ec_dev->event_data);
> +       msg->outsize = 0;
> +
> +       ret = cros_ec_cmd_xfer(ec_dev, msg);
> +       if (ret > 0) {
> +               ec_dev->event_size = ret - 1;
> +               memcpy(&ec_dev->event_data, msg->data,
> +                      sizeof(ec_dev->event_data));
> +       }
> +
> +       kfree(msg);
> +
> +       return ret;
> +}
> +
> +static int get_keyboard_state_event(struct cros_ec_device *ec_dev)
> +{
> +       struct cros_ec_command *msg;
> +
> +       msg = kmalloc(sizeof(*msg) + sizeof(ec_dev->event_data.data),
Given this command will be used on every key press, it is better to
pre-allocate data (like in
https://chromium-review.googlesource.com/276768) and use msg on the
stack like Victor's changes.
> +                     GFP_KERNEL);
> +       if (!msg)
> +               return -ENOMEM;
> +
> +       msg->version = 0;
> +       msg->command = EC_CMD_MKBP_STATE;
> +       msg->insize = sizeof(ec_dev->event_data.data);
> +       msg->outsize = 0;
> +
> +       ec_dev->event_size = cros_ec_cmd_xfer(ec_dev, msg);
> +       ec_dev->event_data.event_type = EC_MKBP_EVENT_KEY_MATRIX;
> +       memcpy(&ec_dev->event_data.data, msg->data,
> +              sizeof(ec_dev->event_data.data));
> +
> +       kfree(msg);
> +
> +       return ec_dev->event_size;
> +}
> +
> +int cros_ec_get_next_event(struct cros_ec_device *ec_dev)
> +{
> +       if (ec_dev->mkbp_event_supported)
> +               return get_next_event(ec_dev);
> +       else
> +               return get_keyboard_state_event(ec_dev);
> +}
> +EXPORT_SYMBOL(cros_ec_get_next_event);
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index a677c2bd485c..8a8fa75178c6 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -72,6 +72,24 @@ struct cros_ec_command {
>         uint8_t data[0];
>  };
>
> +/*
> + * event_data is used by keyboard or event notifier:
> + * event_data format:
> + * If MKBP protocol is supported:
> + * 0           1
> + * +-----------+--------------------------------
> + * | type      | payload
> + * +-----------+--------------------------------
> + * |HOST_EVENT | EVENT (32 bit)
> + * |KEY_MATRIX | Keyboard keys pressed.
> + * |SENSOR_FIFO| Sensors FIFO information.
> + *
> + * Otherwise:
> + * 0           1
> + * +-----------+--------------------------------
> + * |Unused     | Keyboard keys pressed.
> + */
> +
>  /**
>   * struct cros_ec_device - Information about a ChromeOS EC device
>   *
> @@ -107,6 +125,9 @@ struct cros_ec_command {
>   *     should check msg.result for the EC's result code.
>   * @pkt_xfer: send packet to EC and get response
>   * @lock: one transaction at a time
> + * @event_notifier: interrupt event notifier for transport devices.
> + * @event_data: raw payload transferred with the MKBP event.
> + * @event_size: size in bytes of the event data.
>   */
>  struct cros_ec_device {
>
> @@ -135,6 +156,11 @@ struct cros_ec_device {
>         int (*pkt_xfer)(struct cros_ec_device *ec,
>                         struct cros_ec_command *msg);
>         struct mutex lock;
> +       bool mkbp_event_supported;
> +       struct blocking_notifier_head event_notifier;
> +
> +       struct ec_response_get_next_event event_data;
> +       int event_size;
>  };
>
>  /* struct cros_ec_platform - ChromeOS EC platform information
> @@ -252,9 +278,27 @@ int cros_ec_register(struct cros_ec_device *ec_dev);
>   */
>  int cros_ec_query_all(struct cros_ec_device *ec_dev);
>
> +/**
> + * cros_ec_get_next_event -  Fetch next event from the ChromeOS EC
> + *
> + * @ec_dev: Device to fetch event from
> + * @return 0 if ok, -ve on error
> + */
> +int cros_ec_get_next_event(struct cros_ec_device *ec_dev);
> +
>  /* sysfs stuff */
>  extern struct attribute_group cros_ec_attr_group;
>  extern struct attribute_group cros_ec_lightbar_attr_group;
>  extern struct attribute_group cros_ec_vbc_attr_group;
>
> +/**
> + * cros_ec_get_host_event - Return a mask of event set by the EC.
> + *
> + * When MKBP is supported, when the EC raises an interrupt,
> + * We collect the events raised and call the functions in the ec notifier.
> + *
> + * This function is a helper to know which events are raised.
> + */
> +uint32_t cros_ec_get_host_event(struct cros_ec_device *ec_dev);
> +
>  #endif /* __LINUX_MFD_CROS_EC_H */
> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
> index 13b630c10d4c..d86526f0bd8e 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -1762,6 +1762,40 @@ struct ec_result_keyscan_seq_ctrl {
>         };
>  } __packed;
>
> +/*
> + * Get the next pending MKBP event.
> + *
> + * Returns EC_RES_UNAVAILABLE if there is no event pending.
> + */
> +#define EC_CMD_GET_NEXT_EVENT 0x67
> +
> +enum ec_mkbp_event {
> +       /* Keyboard matrix changed. The event data is the new matrix state. */
> +       EC_MKBP_EVENT_KEY_MATRIX = 0,
> +
> +       /* New host event. The event data is 4 bytes of host event flags. */
> +       EC_MKBP_EVENT_HOST_EVENT = 1,
> +
> +       /* New Sensor FIFO data. The event data is fifo_info structure. */
> +       EC_MKBP_EVENT_SENSOR_FIFO = 2,
> +
> +       /* Number of MKBP events */
> +       EC_MKBP_EVENT_COUNT,
> +};
> +
> +union ec_response_get_next_data {
> +       uint8_t   key_matrix[13];
> +
> +       /* Unaligned */
> +       uint32_t  host_event;
> +} __packed;
> +
> +struct ec_response_get_next_event {
> +       uint8_t event_type;
> +       /* Followed by event data if any */
> +       union ec_response_get_next_data data;
> +} __packed;
> +
>  /*****************************************************************************/
>  /* Temperature sensor commands */
>
> --
> 2.5.0
>
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