#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
.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;
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, "Failed to request IRQ %d: %d",
+ 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) {
dev_err(dev,
"Failed to register Power Delivery subdevice %d\n",
err);
- return err;
+ goto fail_mfd;
}
}
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);
}
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 cases, we need to distinguish between 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;
#include <linux/device.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <asm/unaligned.h>
#define EC_COMMAND_RETRIES 50
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);
+ 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),
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;
return ret;
}
EXPORT_SYMBOL(cros_ec_cmd_xfer_status);
+
+static int get_next_event(struct cros_ec_device *ec_dev)
+{
+ u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)];
+ struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
+ int ret;
+
+ 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));
+ }
+
+ return ret;
+}
+
+static int get_keyboard_state_event(struct cros_ec_device *ec_dev)
+{
+ u8 buffer[sizeof(struct cros_ec_command) +
+ sizeof(ec_dev->event_data.data)];
+ struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
+
+ 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));
+
+ 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);
* 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
+ * @mkbp_event_supported: true if this EC supports the MKBP event protocol.
+ * @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 {
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
*/
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
+ *
+ * Returns: 0 on success, Linux error number on failure
+ */
+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;
};
} __packed;
+/*
+ * Command for retrieving the next pending MKBP event from the EC device
+ *
+ * The device replies with UNAVAILABLE if there aren't any pending events.
+ */
+#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 */
projects / users / willy / xarray.git / commitdiff