This is the Greybus SVC (a switch) driver. It includes a simple
watchdog that if it detects that there is no more network activity on
the Unipro system, userspace will be told to restart the system.
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/greybus/svc.c | 1486 +++++++++++++++++++++++++++++++++++++++++
drivers/greybus/svc.h | 109 +++
drivers/greybus/svc_watchdog.c | 198 +++++
3 files changed, 1793 insertions(+)
--- /dev/null
+++ b/drivers/greybus/svc.c
@@ -0,0 +1,1486 @@
+/*
+ * SVC Greybus driver.
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/workqueue.h>
+
+#include "greybus.h"
+
+#define SVC_INTF_EJECT_TIMEOUT 9000
+#define SVC_INTF_ACTIVATE_TIMEOUT 6000
+#define SVC_INTF_RESUME_TIMEOUT 3000
+
+struct gb_svc_deferred_request {
+ struct work_struct work;
+ struct gb_operation *operation;
+};
+
+
+static int gb_svc_queue_deferred_request(struct gb_operation *operation);
+
+static ssize_t endo_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_svc *svc = to_gb_svc(dev);
+
+ return sprintf(buf, "0x%04x\n", svc->endo_id);
+}
+static DEVICE_ATTR_RO(endo_id);
+
+static ssize_t ap_intf_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_svc *svc = to_gb_svc(dev);
+
+ return sprintf(buf, "%u\n", svc->ap_intf_id);
+}
+static DEVICE_ATTR_RO(ap_intf_id);
+
+// FIXME
+// This is a hack, we need to do this "right" and clean the interface up
+// properly, not just forcibly yank the thing out of the system and hope for
the
+// best. But for now, people want their modules to come out without having to
+// throw the thing to the ground or get out a screwdriver.
+static ssize_t intf_eject_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t len)
+{
+ struct gb_svc *svc = to_gb_svc(dev);
+ unsigned short intf_id;
+ int ret;
+
+ ret = kstrtou16(buf, 10, &intf_id);
+ if (ret < 0)
+ return ret;
+
+ dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
+
+ ret = gb_svc_intf_eject(svc, intf_id);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+static DEVICE_ATTR_WO(intf_eject);
+
+static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct gb_svc *svc = to_gb_svc(dev);
+
+ return sprintf(buf, "%s\n",
+ gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
+}
+
+static ssize_t watchdog_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t len)
+{
+ struct gb_svc *svc = to_gb_svc(dev);
+ int retval;
+ bool user_request;
+
+ retval = strtobool(buf, &user_request);
+ if (retval)
+ return retval;
+
+ if (user_request)
+ retval = gb_svc_watchdog_enable(svc);
+ else
+ retval = gb_svc_watchdog_disable(svc);
+ if (retval)
+ return retval;
+ return len;
+}
+static DEVICE_ATTR_RW(watchdog);
+
+static ssize_t watchdog_action_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_svc *svc = to_gb_svc(dev);
+
+ if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
+ return sprintf(buf, "panic\n");
+ else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
+ return sprintf(buf, "reset\n");
+
+ return -EINVAL;
+}
+
+static ssize_t watchdog_action_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct gb_svc *svc = to_gb_svc(dev);
+
+ if (sysfs_streq(buf, "panic"))
+ svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
+ else if (sysfs_streq(buf, "reset"))
+ svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
+ else
+ return -EINVAL;
+
+ return len;
+}
+static DEVICE_ATTR_RW(watchdog_action);
+
+static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
+{
+ struct gb_svc_pwrmon_rail_count_get_response response;
+ int ret;
+
+ ret = gb_operation_sync(svc->connection,
+ GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
+ return ret;
+ }
+
+ *value = response.rail_count;
+
+ return 0;
+}
+
+static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
+ struct gb_svc_pwrmon_rail_names_get_response *response,
+ size_t bufsize)
+{
+ int ret;
+
+ ret = gb_operation_sync(svc->connection,
+ GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
+ response, bufsize);
+ if (ret) {
+ dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
+ return ret;
+ }
+
+ if (response->status != GB_SVC_OP_SUCCESS) {
+ dev_err(&svc->dev,
+ "SVC error while getting rail names: %u\n",
+ response->status);
+ return -EREMOTEIO;
+ }
+
+ return 0;
+}
+
+static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
+ u8 measurement_type, u32 *value)
+{
+ struct gb_svc_pwrmon_sample_get_request request;
+ struct gb_svc_pwrmon_sample_get_response response;
+ int ret;
+
+ request.rail_id = rail_id;
+ request.measurement_type = measurement_type;
+
+ ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
+ return ret;
+ }
+
+ if (response.result) {
+ dev_err(&svc->dev,
+ "UniPro error while getting rail power sample (%d %d):
%d\n",
+ rail_id, measurement_type, response.result);
+ switch (response.result) {
+ case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
+ return -EINVAL;
+ case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
+ return -ENOMSG;
+ default:
+ return -EREMOTEIO;
+ }
+ }
+
+ *value = le32_to_cpu(response.measurement);
+
+ return 0;
+}
+
+int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
+ u8 measurement_type, u32 *value)
+{
+ struct gb_svc_pwrmon_intf_sample_get_request request;
+ struct gb_svc_pwrmon_intf_sample_get_response response;
+ int ret;
+
+ request.intf_id = intf_id;
+ request.measurement_type = measurement_type;
+
+ ret = gb_operation_sync(svc->connection,
+ GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
+ return ret;
+ }
+
+ if (response.result) {
+ dev_err(&svc->dev,
+ "UniPro error while getting intf power sample (%d %d):
%d\n",
+ intf_id, measurement_type, response.result);
+ switch (response.result) {
+ case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
+ return -EINVAL;
+ case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
+ return -ENOMSG;
+ default:
+ return -EREMOTEIO;
+ }
+ }
+
+ *value = le32_to_cpu(response.measurement);
+
+ return 0;
+}
+
+static struct attribute *svc_attrs[] = {
+ &dev_attr_endo_id.attr,
+ &dev_attr_ap_intf_id.attr,
+ &dev_attr_intf_eject.attr,
+ &dev_attr_watchdog.attr,
+ &dev_attr_watchdog_action.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(svc);
+
+int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
+{
+ struct gb_svc_intf_device_id_request request;
+
+ request.intf_id = intf_id;
+ request.device_id = device_id;
+
+ return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
+ &request, sizeof(request), NULL, 0);
+}
+
+int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
+{
+ struct gb_svc_intf_eject_request request;
+ int ret;
+
+ request.intf_id = intf_id;
+
+ /*
+ * The pulse width for module release in svc is long so we need to
+ * increase the timeout so the operation will not return to soon.
+ */
+ ret = gb_operation_sync_timeout(svc->connection,
+ GB_SVC_TYPE_INTF_EJECT, &request,
+ sizeof(request), NULL, 0,
+ SVC_INTF_EJECT_TIMEOUT);
+ if (ret) {
+ dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
+ return ret;
+ }
+
+ return 0;
+}
+
+int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
+{
+ struct gb_svc_intf_vsys_request request;
+ struct gb_svc_intf_vsys_response response;
+ int type, ret;
+
+ request.intf_id = intf_id;
+
+ if (enable)
+ type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
+ else
+ type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
+
+ ret = gb_operation_sync(svc->connection, type,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret < 0)
+ return ret;
+ if (response.result_code != GB_SVC_INTF_VSYS_OK)
+ return -EREMOTEIO;
+ return 0;
+}
+
+int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
+{
+ struct gb_svc_intf_refclk_request request;
+ struct gb_svc_intf_refclk_response response;
+ int type, ret;
+
+ request.intf_id = intf_id;
+
+ if (enable)
+ type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
+ else
+ type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
+
+ ret = gb_operation_sync(svc->connection, type,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret < 0)
+ return ret;
+ if (response.result_code != GB_SVC_INTF_REFCLK_OK)
+ return -EREMOTEIO;
+ return 0;
+}
+
+int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
+{
+ struct gb_svc_intf_unipro_request request;
+ struct gb_svc_intf_unipro_response response;
+ int type, ret;
+
+ request.intf_id = intf_id;
+
+ if (enable)
+ type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
+ else
+ type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
+
+ ret = gb_operation_sync(svc->connection, type,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret < 0)
+ return ret;
+ if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
+ return -EREMOTEIO;
+ return 0;
+}
+
+int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
+{
+ struct gb_svc_intf_activate_request request;
+ struct gb_svc_intf_activate_response response;
+ int ret;
+
+ request.intf_id = intf_id;
+
+ ret = gb_operation_sync_timeout(svc->connection,
+ GB_SVC_TYPE_INTF_ACTIVATE,
+ &request, sizeof(request),
+ &response, sizeof(response),
+ SVC_INTF_ACTIVATE_TIMEOUT);
+ if (ret < 0)
+ return ret;
+ if (response.status != GB_SVC_OP_SUCCESS) {
+ dev_err(&svc->dev, "failed to activate interface %u: %u\n",
+ intf_id, response.status);
+ return -EREMOTEIO;
+ }
+
+ *intf_type = response.intf_type;
+
+ return 0;
+}
+
+int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
+{
+ struct gb_svc_intf_resume_request request;
+ struct gb_svc_intf_resume_response response;
+ int ret;
+
+ request.intf_id = intf_id;
+
+ ret = gb_operation_sync_timeout(svc->connection,
+ GB_SVC_TYPE_INTF_RESUME,
+ &request, sizeof(request),
+ &response, sizeof(response),
+ SVC_INTF_RESUME_TIMEOUT);
+ if (ret < 0) {
+ dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
+ intf_id, ret);
+ return ret;
+ }
+
+ if (response.status != GB_SVC_OP_SUCCESS) {
+ dev_err(&svc->dev, "failed to resume interface %u: %u\n",
+ intf_id, response.status);
+ return -EREMOTEIO;
+ }
+
+ return 0;
+}
+
+int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
+ u32 *value)
+{
+ struct gb_svc_dme_peer_get_request request;
+ struct gb_svc_dme_peer_get_response response;
+ u16 result;
+ int ret;
+
+ request.intf_id = intf_id;
+ request.attr = cpu_to_le16(attr);
+ request.selector = cpu_to_le16(selector);
+
+ ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u):
%d\n",
+ intf_id, attr, selector, ret);
+ return ret;
+ }
+
+ result = le16_to_cpu(response.result_code);
+ if (result) {
+ dev_err(&svc->dev, "UniPro error while getting DME attribute
(%u 0x%04x %u): %u\n",
+ intf_id, attr, selector, result);
+ return -EREMOTEIO;
+ }
+
+ if (value)
+ *value = le32_to_cpu(response.attr_value);
+
+ return 0;
+}
+
+int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
+ u32 value)
+{
+ struct gb_svc_dme_peer_set_request request;
+ struct gb_svc_dme_peer_set_response response;
+ u16 result;
+ int ret;
+
+ request.intf_id = intf_id;
+ request.attr = cpu_to_le16(attr);
+ request.selector = cpu_to_le16(selector);
+ request.value = cpu_to_le32(value);
+
+ ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u
%u): %d\n",
+ intf_id, attr, selector, value, ret);
+ return ret;
+ }
+
+ result = le16_to_cpu(response.result_code);
+ if (result) {
+ dev_err(&svc->dev, "UniPro error while setting DME attribute
(%u 0x%04x %u %u): %u\n",
+ intf_id, attr, selector, value, result);
+ return -EREMOTEIO;
+ }
+
+ return 0;
+}
+
+int gb_svc_connection_create(struct gb_svc *svc,
+ u8 intf1_id, u16 cport1_id,
+ u8 intf2_id, u16 cport2_id,
+ u8 cport_flags)
+{
+ struct gb_svc_conn_create_request request;
+
+ request.intf1_id = intf1_id;
+ request.cport1_id = cpu_to_le16(cport1_id);
+ request.intf2_id = intf2_id;
+ request.cport2_id = cpu_to_le16(cport2_id);
+ request.tc = 0; /* TC0 */
+ request.flags = cport_flags;
+
+ return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
+ &request, sizeof(request), NULL, 0);
+}
+
+void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
+ u8 intf2_id, u16 cport2_id)
+{
+ struct gb_svc_conn_destroy_request request;
+ struct gb_connection *connection = svc->connection;
+ int ret;
+
+ request.intf1_id = intf1_id;
+ request.cport1_id = cpu_to_le16(cport1_id);
+ request.intf2_id = intf2_id;
+ request.cport2_id = cpu_to_le16(cport2_id);
+
+ ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
+ &request, sizeof(request), NULL, 0);
+ if (ret) {
+ dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u):
%d\n",
+ intf1_id, cport1_id, intf2_id, cport2_id, ret);
+ }
+}
+
+int gb_svc_timesync_enable(struct gb_svc *svc, u8 count, u64 frame_time,
+ u32 strobe_delay, u32 refclk)
+{
+ struct gb_connection *connection = svc->connection;
+ struct gb_svc_timesync_enable_request request;
+
+ request.count = count;
+ request.frame_time = cpu_to_le64(frame_time);
+ request.strobe_delay = cpu_to_le32(strobe_delay);
+ request.refclk = cpu_to_le32(refclk);
+ return gb_operation_sync(connection,
+ GB_SVC_TYPE_TIMESYNC_ENABLE,
+ &request, sizeof(request), NULL, 0);
+}
+
+int gb_svc_timesync_disable(struct gb_svc *svc)
+{
+ struct gb_connection *connection = svc->connection;
+
+ return gb_operation_sync(connection,
+ GB_SVC_TYPE_TIMESYNC_DISABLE,
+ NULL, 0, NULL, 0);
+}
+
+int gb_svc_timesync_authoritative(struct gb_svc *svc, u64 *frame_time)
+{
+ struct gb_connection *connection = svc->connection;
+ struct gb_svc_timesync_authoritative_response response;
+ int ret, i;
+
+ ret = gb_operation_sync(connection,
+ GB_SVC_TYPE_TIMESYNC_AUTHORITATIVE, NULL, 0,
+ &response, sizeof(response));
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < GB_TIMESYNC_MAX_STROBES; i++)
+ frame_time[i] = le64_to_cpu(response.frame_time[i]);
+ return 0;
+}
+
+int gb_svc_timesync_ping(struct gb_svc *svc, u64 *frame_time)
+{
+ struct gb_connection *connection = svc->connection;
+ struct gb_svc_timesync_ping_response response;
+ int ret;
+
+ ret = gb_operation_sync(connection,
+ GB_SVC_TYPE_TIMESYNC_PING,
+ NULL, 0,
+ &response, sizeof(response));
+ if (ret < 0)
+ return ret;
+
+ *frame_time = le64_to_cpu(response.frame_time);
+ return 0;
+}
+
+int gb_svc_timesync_wake_pins_acquire(struct gb_svc *svc, u32 strobe_mask)
+{
+ struct gb_connection *connection = svc->connection;
+ struct gb_svc_timesync_wake_pins_acquire_request request;
+
+ request.strobe_mask = cpu_to_le32(strobe_mask);
+ return gb_operation_sync(connection,
+ GB_SVC_TYPE_TIMESYNC_WAKE_PINS_ACQUIRE,
+ &request, sizeof(request),
+ NULL, 0);
+}
+
+int gb_svc_timesync_wake_pins_release(struct gb_svc *svc)
+{
+ struct gb_connection *connection = svc->connection;
+
+ return gb_operation_sync(connection,
+ GB_SVC_TYPE_TIMESYNC_WAKE_PINS_RELEASE,
+ NULL, 0, NULL, 0);
+}
+
+/* Creates bi-directional routes between the devices */
+int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
+ u8 intf2_id, u8 dev2_id)
+{
+ struct gb_svc_route_create_request request;
+
+ request.intf1_id = intf1_id;
+ request.dev1_id = dev1_id;
+ request.intf2_id = intf2_id;
+ request.dev2_id = dev2_id;
+
+ return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
+ &request, sizeof(request), NULL, 0);
+}
+
+/* Destroys bi-directional routes between the devices */
+void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
+{
+ struct gb_svc_route_destroy_request request;
+ int ret;
+
+ request.intf1_id = intf1_id;
+ request.intf2_id = intf2_id;
+
+ ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
+ &request, sizeof(request), NULL, 0);
+ if (ret) {
+ dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
+ intf1_id, intf2_id, ret);
+ }
+}
+
+int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
+ u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
+ u8 tx_amplitude, u8 tx_hs_equalizer,
+ u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
+ u8 flags, u32 quirks,
+ struct gb_svc_l2_timer_cfg *local,
+ struct gb_svc_l2_timer_cfg *remote)
+{
+ struct gb_svc_intf_set_pwrm_request request;
+ struct gb_svc_intf_set_pwrm_response response;
+ int ret;
+ u16 result_code;
+
+ memset(&request, 0, sizeof(request));
+
+ request.intf_id = intf_id;
+ request.hs_series = hs_series;
+ request.tx_mode = tx_mode;
+ request.tx_gear = tx_gear;
+ request.tx_nlanes = tx_nlanes;
+ request.tx_amplitude = tx_amplitude;
+ request.tx_hs_equalizer = tx_hs_equalizer;
+ request.rx_mode = rx_mode;
+ request.rx_gear = rx_gear;
+ request.rx_nlanes = rx_nlanes;
+ request.flags = flags;
+ request.quirks = cpu_to_le32(quirks);
+ if (local)
+ request.local_l2timerdata = *local;
+ if (remote)
+ request.remote_l2timerdata = *remote;
+
+ ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret < 0)
+ return ret;
+
+ result_code = response.result_code;
+ if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
+ dev_err(&svc->dev, "set power mode = %d\n", result_code);
+ return -EIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
+
+int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
+{
+ struct gb_svc_intf_set_pwrm_request request;
+ struct gb_svc_intf_set_pwrm_response response;
+ int ret;
+ u16 result_code;
+
+ memset(&request, 0, sizeof(request));
+
+ request.intf_id = intf_id;
+ request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
+ request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
+ request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
+
+ ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret < 0) {
+ dev_err(&svc->dev,
+ "failed to send set power mode operation to interface
%u: %d\n",
+ intf_id, ret);
+ return ret;
+ }
+
+ result_code = response.result_code;
+ if (result_code != GB_SVC_SETPWRM_PWR_OK) {
+ dev_err(&svc->dev,
+ "failed to hibernate the link for interface %u: %u\n",
+ intf_id, result_code);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+int gb_svc_ping(struct gb_svc *svc)
+{
+ return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
+ NULL, 0, NULL, 0,
+ GB_OPERATION_TIMEOUT_DEFAULT * 2);
+}
+
+static int gb_svc_version_request(struct gb_operation *op)
+{
+ struct gb_connection *connection = op->connection;
+ struct gb_svc *svc = gb_connection_get_data(connection);
+ struct gb_svc_version_request *request;
+ struct gb_svc_version_response *response;
+
+ if (op->request->payload_size < sizeof(*request)) {
+ dev_err(&svc->dev, "short version request (%zu < %zu)\n",
+ op->request->payload_size,
+ sizeof(*request));
+ return -EINVAL;
+ }
+
+ request = op->request->payload;
+
+ if (request->major > GB_SVC_VERSION_MAJOR) {
+ dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
+ request->major, GB_SVC_VERSION_MAJOR);
+ return -ENOTSUPP;
+ }
+
+ svc->protocol_major = request->major;
+ svc->protocol_minor = request->minor;
+
+ if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
+ return -ENOMEM;
+
+ response = op->response->payload;
+ response->major = svc->protocol_major;
+ response->minor = svc->protocol_minor;
+
+ return 0;
+}
+
+static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
+ size_t len, loff_t *offset)
+{
+ struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
+ struct gb_svc *svc = pwrmon_rails->svc;
+ int ret, desc;
+ u32 value;
+ char buff[16];
+
+ ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
+ GB_SVC_PWRMON_TYPE_VOL, &value);
+ if (ret) {
+ dev_err(&svc->dev,
+ "failed to get voltage sample %u: %d\n",
+ pwrmon_rails->id, ret);
+ return ret;
+ }
+
+ desc = scnprintf(buff, sizeof(buff), "%u\n", value);
+
+ return simple_read_from_buffer(buf, len, offset, buff, desc);
+}
+
+static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
+ size_t len, loff_t *offset)
+{
+ struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
+ struct gb_svc *svc = pwrmon_rails->svc;
+ int ret, desc;
+ u32 value;
+ char buff[16];
+
+ ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
+ GB_SVC_PWRMON_TYPE_CURR, &value);
+ if (ret) {
+ dev_err(&svc->dev,
+ "failed to get current sample %u: %d\n",
+ pwrmon_rails->id, ret);
+ return ret;
+ }
+
+ desc = scnprintf(buff, sizeof(buff), "%u\n", value);
+
+ return simple_read_from_buffer(buf, len, offset, buff, desc);
+}
+
+static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
+ size_t len, loff_t *offset)
+{
+ struct svc_debugfs_pwrmon_rail *pwrmon_rails = file->f_inode->i_private;
+ struct gb_svc *svc = pwrmon_rails->svc;
+ int ret, desc;
+ u32 value;
+ char buff[16];
+
+ ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
+ GB_SVC_PWRMON_TYPE_PWR, &value);
+ if (ret) {
+ dev_err(&svc->dev, "failed to get power sample %u: %d\n",
+ pwrmon_rails->id, ret);
+ return ret;
+ }
+
+ desc = scnprintf(buff, sizeof(buff), "%u\n", value);
+
+ return simple_read_from_buffer(buf, len, offset, buff, desc);
+}
+
+static const struct file_operations pwrmon_debugfs_voltage_fops = {
+ .read = pwr_debugfs_voltage_read,
+};
+
+static const struct file_operations pwrmon_debugfs_current_fops = {
+ .read = pwr_debugfs_current_read,
+};
+
+static const struct file_operations pwrmon_debugfs_power_fops = {
+ .read = pwr_debugfs_power_read,
+};
+
+static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
+{
+ int i;
+ size_t bufsize;
+ struct dentry *dent;
+ struct gb_svc_pwrmon_rail_names_get_response *rail_names;
+ u8 rail_count;
+
+ dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
+ if (IS_ERR_OR_NULL(dent))
+ return;
+
+ if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
+ goto err_pwrmon_debugfs;
+
+ if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
+ goto err_pwrmon_debugfs;
+
+ bufsize = sizeof(*rail_names) +
+ GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
+
+ rail_names = kzalloc(bufsize, GFP_KERNEL);
+ if (!rail_names)
+ goto err_pwrmon_debugfs;
+
+ svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
+ GFP_KERNEL);
+ if (!svc->pwrmon_rails)
+ goto err_pwrmon_debugfs_free;
+
+ if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
+ goto err_pwrmon_debugfs_free;
+
+ for (i = 0; i < rail_count; i++) {
+ struct dentry *dir;
+ struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
+ char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
+
+ snprintf(fname, sizeof(fname), "%s",
+ (char *)&rail_names->name[i]);
+
+ rail->id = i;
+ rail->svc = svc;
+
+ dir = debugfs_create_dir(fname, dent);
+ debugfs_create_file("voltage_now", S_IRUGO, dir, rail,
+ &pwrmon_debugfs_voltage_fops);
+ debugfs_create_file("current_now", S_IRUGO, dir, rail,
+ &pwrmon_debugfs_current_fops);
+ debugfs_create_file("power_now", S_IRUGO, dir, rail,
+ &pwrmon_debugfs_power_fops);
+ }
+
+ kfree(rail_names);
+ return;
+
+err_pwrmon_debugfs_free:
+ kfree(rail_names);
+ kfree(svc->pwrmon_rails);
+ svc->pwrmon_rails = NULL;
+
+err_pwrmon_debugfs:
+ debugfs_remove(dent);
+}
+
+static void gb_svc_debugfs_init(struct gb_svc *svc)
+{
+ svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
+ gb_debugfs_get());
+ gb_svc_pwrmon_debugfs_init(svc);
+}
+
+static void gb_svc_debugfs_exit(struct gb_svc *svc)
+{
+ debugfs_remove_recursive(svc->debugfs_dentry);
+ kfree(svc->pwrmon_rails);
+ svc->pwrmon_rails = NULL;
+}
+
+static int gb_svc_hello(struct gb_operation *op)
+{
+ struct gb_connection *connection = op->connection;
+ struct gb_svc *svc = gb_connection_get_data(connection);
+ struct gb_svc_hello_request *hello_request;
+ int ret;
+
+ if (op->request->payload_size < sizeof(*hello_request)) {
+ dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
+ op->request->payload_size,
+ sizeof(*hello_request));
+ return -EINVAL;
+ }
+
+ hello_request = op->request->payload;
+ svc->endo_id = le16_to_cpu(hello_request->endo_id);
+ svc->ap_intf_id = hello_request->interface_id;
+
+ ret = device_add(&svc->dev);
+ if (ret) {
+ dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
+ return ret;
+ }
+
+ ret = gb_svc_watchdog_create(svc);
+ if (ret) {
+ dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
+ goto err_unregister_device;
+ }
+
+ gb_svc_debugfs_init(svc);
+
+ ret = gb_timesync_svc_add(svc);
+ if (ret) {
+ dev_err(&svc->dev, "failed to add SVC to timesync: %d\n", ret);
+ gb_svc_debugfs_exit(svc);
+ goto err_unregister_device;
+ }
+
+ return gb_svc_queue_deferred_request(op);
+
+err_unregister_device:
+ gb_svc_watchdog_destroy(svc);
+ device_del(&svc->dev);
+ return ret;
+}
+
+static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
+ u8 intf_id)
+{
+ struct gb_host_device *hd = svc->hd;
+ struct gb_module *module;
+ size_t num_interfaces;
+ u8 module_id;
+
+ list_for_each_entry(module, &hd->modules, hd_node) {
+ module_id = module->module_id;
+ num_interfaces = module->num_interfaces;
+
+ if (intf_id >= module_id &&
+ intf_id < module_id + num_interfaces) {
+ return module->interfaces[intf_id - module_id];
+ }
+ }
+
+ return NULL;
+}
+
+static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
+{
+ struct gb_host_device *hd = svc->hd;
+ struct gb_module *module;
+
+ list_for_each_entry(module, &hd->modules, hd_node) {
+ if (module->module_id == module_id)
+ return module;
+ }
+
+ return NULL;
+}
+
+static void gb_svc_process_hello_deferred(struct gb_operation *operation)
+{
+ struct gb_connection *connection = operation->connection;
+ struct gb_svc *svc = gb_connection_get_data(connection);
+ int ret;
+
+ /*
+ * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
+ * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
+ * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
+ * module.
+ *
+ * The code should be removed once SW-2217, Heuristic for UniPro
+ * Power Mode Changes is resolved.
+ */
+ ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
+ GB_SVC_UNIPRO_HS_SERIES_A,
+ GB_SVC_UNIPRO_SLOW_AUTO_MODE,
+ 2, 1,
+ GB_SVC_SMALL_AMPLITUDE,
GB_SVC_NO_DE_EMPHASIS,
+ GB_SVC_UNIPRO_SLOW_AUTO_MODE,
+ 2, 1,
+ 0, 0,
+ NULL, NULL);
+
+ if (ret)
+ dev_warn(&svc->dev,
+ "power mode change failed on AP to switch link: %d\n",
+ ret);
+}
+
+static void gb_svc_process_module_inserted(struct gb_operation *operation)
+{
+ struct gb_svc_module_inserted_request *request;
+ struct gb_connection *connection = operation->connection;
+ struct gb_svc *svc = gb_connection_get_data(connection);
+ struct gb_host_device *hd = svc->hd;
+ struct gb_module *module;
+ size_t num_interfaces;
+ u8 module_id;
+ u16 flags;
+ int ret;
+
+ /* The request message size has already been verified. */
+ request = operation->request->payload;
+ module_id = request->primary_intf_id;
+ num_interfaces = request->intf_count;
+ flags = le16_to_cpu(request->flags);
+
+ dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags =
0x%04x\n",
+ __func__, module_id, num_interfaces, flags);
+
+ if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
+ dev_warn(&svc->dev, "no primary interface detected on module
%u\n",
+ module_id);
+ }
+
+ module = gb_svc_module_lookup(svc, module_id);
+ if (module) {
+ dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
+ module_id);
+ return;
+ }
+
+ module = gb_module_create(hd, module_id, num_interfaces);
+ if (!module) {
+ dev_err(&svc->dev, "failed to create module\n");
+ return;
+ }
+
+ ret = gb_module_add(module);
+ if (ret) {
+ gb_module_put(module);
+ return;
+ }
+
+ list_add(&module->hd_node, &hd->modules);
+}
+
+static void gb_svc_process_module_removed(struct gb_operation *operation)
+{
+ struct gb_svc_module_removed_request *request;
+ struct gb_connection *connection = operation->connection;
+ struct gb_svc *svc = gb_connection_get_data(connection);
+ struct gb_module *module;
+ u8 module_id;
+
+ /* The request message size has already been verified. */
+ request = operation->request->payload;
+ module_id = request->primary_intf_id;
+
+ dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
+
+ module = gb_svc_module_lookup(svc, module_id);
+ if (!module) {
+ dev_warn(&svc->dev, "unexpected module-removed event %u\n",
+ module_id);
+ return;
+ }
+
+ module->disconnected = true;
+
+ gb_module_del(module);
+ list_del(&module->hd_node);
+ gb_module_put(module);
+}
+
+static void gb_svc_process_intf_oops(struct gb_operation *operation)
+{
+ struct gb_svc_intf_oops_request *request;
+ struct gb_connection *connection = operation->connection;
+ struct gb_svc *svc = gb_connection_get_data(connection);
+ struct gb_interface *intf;
+ u8 intf_id;
+ u8 reason;
+
+ /* The request message size has already been verified. */
+ request = operation->request->payload;
+ intf_id = request->intf_id;
+ reason = request->reason;
+
+ intf = gb_svc_interface_lookup(svc, intf_id);
+ if (!intf) {
+ dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
+ intf_id);
+ return;
+ }
+
+ dev_info(&svc->dev, "Deactivating interface %u, interface oops reason =
%u\n",
+ intf_id, reason);
+
+ mutex_lock(&intf->mutex);
+ intf->disconnected = true;
+ gb_interface_disable(intf);
+ gb_interface_deactivate(intf);
+ mutex_unlock(&intf->mutex);
+}
+
+static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
+{
+ struct gb_svc_intf_mailbox_event_request *request;
+ struct gb_connection *connection = operation->connection;
+ struct gb_svc *svc = gb_connection_get_data(connection);
+ struct gb_interface *intf;
+ u8 intf_id;
+ u16 result_code;
+ u32 mailbox;
+
+ /* The request message size has already been verified. */
+ request = operation->request->payload;
+ intf_id = request->intf_id;
+ result_code = le16_to_cpu(request->result_code);
+ mailbox = le32_to_cpu(request->mailbox);
+
+ dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
+ __func__, intf_id, result_code, mailbox);
+
+ intf = gb_svc_interface_lookup(svc, intf_id);
+ if (!intf) {
+ dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
+ return;
+ }
+
+ gb_interface_mailbox_event(intf, result_code, mailbox);
+}
+
+static void gb_svc_process_deferred_request(struct work_struct *work)
+{
+ struct gb_svc_deferred_request *dr;
+ struct gb_operation *operation;
+ struct gb_svc *svc;
+ u8 type;
+
+ dr = container_of(work, struct gb_svc_deferred_request, work);
+ operation = dr->operation;
+ svc = gb_connection_get_data(operation->connection);
+ type = operation->request->header->type;
+
+ switch (type) {
+ case GB_SVC_TYPE_SVC_HELLO:
+ gb_svc_process_hello_deferred(operation);
+ break;
+ case GB_SVC_TYPE_MODULE_INSERTED:
+ gb_svc_process_module_inserted(operation);
+ break;
+ case GB_SVC_TYPE_MODULE_REMOVED:
+ gb_svc_process_module_removed(operation);
+ break;
+ case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
+ gb_svc_process_intf_mailbox_event(operation);
+ break;
+ case GB_SVC_TYPE_INTF_OOPS:
+ gb_svc_process_intf_oops(operation);
+ break;
+ default:
+ dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
+ }
+
+ gb_operation_put(operation);
+ kfree(dr);
+}
+
+static int gb_svc_queue_deferred_request(struct gb_operation *operation)
+{
+ struct gb_svc *svc = gb_connection_get_data(operation->connection);
+ struct gb_svc_deferred_request *dr;
+
+ dr = kmalloc(sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ gb_operation_get(operation);
+
+ dr->operation = operation;
+ INIT_WORK(&dr->work, gb_svc_process_deferred_request);
+
+ queue_work(svc->wq, &dr->work);
+
+ return 0;
+}
+
+static int gb_svc_intf_reset_recv(struct gb_operation *op)
+{
+ struct gb_svc *svc = gb_connection_get_data(op->connection);
+ struct gb_message *request = op->request;
+ struct gb_svc_intf_reset_request *reset;
+ u8 intf_id;
+
+ if (request->payload_size < sizeof(*reset)) {
+ dev_warn(&svc->dev, "short reset request received (%zu <
%zu)\n",
+ request->payload_size, sizeof(*reset));
+ return -EINVAL;
+ }
+ reset = request->payload;
+
+ intf_id = reset->intf_id;
+
+ /* FIXME Reset the interface here */
+
+ return 0;
+}
+
+static int gb_svc_module_inserted_recv(struct gb_operation *op)
+{
+ struct gb_svc *svc = gb_connection_get_data(op->connection);
+ struct gb_svc_module_inserted_request *request;
+
+ if (op->request->payload_size < sizeof(*request)) {
+ dev_warn(&svc->dev, "short module-inserted request received
(%zu < %zu)\n",
+ op->request->payload_size, sizeof(*request));
+ return -EINVAL;
+ }
+
+ request = op->request->payload;
+
+ dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
+ request->primary_intf_id);
+
+ return gb_svc_queue_deferred_request(op);
+}
+
+static int gb_svc_module_removed_recv(struct gb_operation *op)
+{
+ struct gb_svc *svc = gb_connection_get_data(op->connection);
+ struct gb_svc_module_removed_request *request;
+
+ if (op->request->payload_size < sizeof(*request)) {
+ dev_warn(&svc->dev, "short module-removed request received (%zu
< %zu)\n",
+ op->request->payload_size, sizeof(*request));
+ return -EINVAL;
+ }
+
+ request = op->request->payload;
+
+ dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
+ request->primary_intf_id);
+
+ return gb_svc_queue_deferred_request(op);
+}
+
+static int gb_svc_intf_oops_recv(struct gb_operation *op)
+{
+ struct gb_svc *svc = gb_connection_get_data(op->connection);
+ struct gb_svc_intf_oops_request *request;
+
+ if (op->request->payload_size < sizeof(*request)) {
+ dev_warn(&svc->dev, "short intf-oops request received (%zu <
%zu)\n",
+ op->request->payload_size, sizeof(*request));
+ return -EINVAL;
+ }
+
+ return gb_svc_queue_deferred_request(op);
+}
+
+static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
+{
+ struct gb_svc *svc = gb_connection_get_data(op->connection);
+ struct gb_svc_intf_mailbox_event_request *request;
+
+ if (op->request->payload_size < sizeof(*request)) {
+ dev_warn(&svc->dev, "short mailbox request received (%zu <
%zu)\n",
+ op->request->payload_size, sizeof(*request));
+ return -EINVAL;
+ }
+
+ request = op->request->payload;
+
+ dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
+
+ return gb_svc_queue_deferred_request(op);
+}
+
+static int gb_svc_request_handler(struct gb_operation *op)
+{
+ struct gb_connection *connection = op->connection;
+ struct gb_svc *svc = gb_connection_get_data(connection);
+ u8 type = op->type;
+ int ret = 0;
+
+ /*
+ * SVC requests need to follow a specific order (at least initially) and
+ * below code takes care of enforcing that. The expected order is:
+ * - PROTOCOL_VERSION
+ * - SVC_HELLO
+ * - Any other request, but the earlier two.
+ *
+ * Incoming requests are guaranteed to be serialized and so we don't
+ * need to protect 'state' for any races.
+ */
+ switch (type) {
+ case GB_SVC_TYPE_PROTOCOL_VERSION:
+ if (svc->state != GB_SVC_STATE_RESET)
+ ret = -EINVAL;
+ break;
+ case GB_SVC_TYPE_SVC_HELLO:
+ if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
+ ret = -EINVAL;
+ break;
+ default:
+ if (svc->state != GB_SVC_STATE_SVC_HELLO)
+ ret = -EINVAL;
+ break;
+ }
+
+ if (ret) {
+ dev_warn(&svc->dev, "unexpected request 0x%02x received (state
%u)\n",
+ type, svc->state);
+ return ret;
+ }
+
+ switch (type) {
+ case GB_SVC_TYPE_PROTOCOL_VERSION:
+ ret = gb_svc_version_request(op);
+ if (!ret)
+ svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
+ return ret;
+ case GB_SVC_TYPE_SVC_HELLO:
+ ret = gb_svc_hello(op);
+ if (!ret)
+ svc->state = GB_SVC_STATE_SVC_HELLO;
+ return ret;
+ case GB_SVC_TYPE_INTF_RESET:
+ return gb_svc_intf_reset_recv(op);
+ case GB_SVC_TYPE_MODULE_INSERTED:
+ return gb_svc_module_inserted_recv(op);
+ case GB_SVC_TYPE_MODULE_REMOVED:
+ return gb_svc_module_removed_recv(op);
+ case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
+ return gb_svc_intf_mailbox_event_recv(op);
+ case GB_SVC_TYPE_INTF_OOPS:
+ return gb_svc_intf_oops_recv(op);
+ default:
+ dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
+ return -EINVAL;
+ }
+}
+
+static void gb_svc_release(struct device *dev)
+{
+ struct gb_svc *svc = to_gb_svc(dev);
+
+ if (svc->connection)
+ gb_connection_destroy(svc->connection);
+ ida_destroy(&svc->device_id_map);
+ destroy_workqueue(svc->wq);
+ kfree(svc);
+}
+
+struct device_type greybus_svc_type = {
+ .name = "greybus_svc",
+ .release = gb_svc_release,
+};
+
+struct gb_svc *gb_svc_create(struct gb_host_device *hd)
+{
+ struct gb_svc *svc;
+
+ svc = kzalloc(sizeof(*svc), GFP_KERNEL);
+ if (!svc)
+ return NULL;
+
+ svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
+ if (!svc->wq) {
+ kfree(svc);
+ return NULL;
+ }
+
+ svc->dev.parent = &hd->dev;
+ svc->dev.bus = &greybus_bus_type;
+ svc->dev.type = &greybus_svc_type;
+ svc->dev.groups = svc_groups;
+ svc->dev.dma_mask = svc->dev.parent->dma_mask;
+ device_initialize(&svc->dev);
+
+ dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
+
+ ida_init(&svc->device_id_map);
+ svc->state = GB_SVC_STATE_RESET;
+ svc->hd = hd;
+
+ svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
+ gb_svc_request_handler);
+ if (IS_ERR(svc->connection)) {
+ dev_err(&svc->dev, "failed to create connection: %ld\n",
+ PTR_ERR(svc->connection));
+ goto err_put_device;
+ }
+
+ gb_connection_set_data(svc->connection, svc);
+
+ return svc;
+
+err_put_device:
+ put_device(&svc->dev);
+ return NULL;
+}
+
+int gb_svc_add(struct gb_svc *svc)
+{
+ int ret;
+
+ /*
+ * The SVC protocol is currently driven by the SVC, so the SVC device
+ * is added from the connection request handler when enough
+ * information has been received.
+ */
+ ret = gb_connection_enable(svc->connection);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void gb_svc_remove_modules(struct gb_svc *svc)
+{
+ struct gb_host_device *hd = svc->hd;
+ struct gb_module *module, *tmp;
+
+ list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
+ gb_module_del(module);
+ list_del(&module->hd_node);
+ gb_module_put(module);
+ }
+}
+
+void gb_svc_del(struct gb_svc *svc)
+{
+ gb_connection_disable_rx(svc->connection);
+
+ /*
+ * The SVC device may have been registered from the request handler.
+ */
+ if (device_is_registered(&svc->dev)) {
+ gb_timesync_svc_remove(svc);
+ gb_svc_debugfs_exit(svc);
+ gb_svc_watchdog_destroy(svc);
+ device_del(&svc->dev);
+ }
+
+ flush_workqueue(svc->wq);
+
+ gb_svc_remove_modules(svc);
+
+ gb_connection_disable(svc->connection);
+}
+
+void gb_svc_put(struct gb_svc *svc)
+{
+ put_device(&svc->dev);
+}
--- /dev/null
+++ b/drivers/greybus/svc.h
@@ -0,0 +1,109 @@
+/*
+ * Greybus SVC code
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __SVC_H
+#define __SVC_H
+
+#define GB_SVC_CPORT_FLAG_E2EFC BIT(0)
+#define GB_SVC_CPORT_FLAG_CSD_N BIT(1)
+#define GB_SVC_CPORT_FLAG_CSV_N BIT(2)
+
+enum gb_svc_state {
+ GB_SVC_STATE_RESET,
+ GB_SVC_STATE_PROTOCOL_VERSION,
+ GB_SVC_STATE_SVC_HELLO,
+};
+
+enum gb_svc_watchdog_bite {
+ GB_SVC_WATCHDOG_BITE_RESET_UNIPRO = 0,
+ GB_SVC_WATCHDOG_BITE_PANIC_KERNEL,
+};
+
+struct gb_svc_watchdog;
+
+struct svc_debugfs_pwrmon_rail {
+ u8 id;
+ struct gb_svc *svc;
+};
+
+struct gb_svc {
+ struct device dev;
+
+ struct gb_host_device *hd;
+ struct gb_connection *connection;
+ enum gb_svc_state state;
+ struct ida device_id_map;
+ struct workqueue_struct *wq;
+
+ u16 endo_id;
+ u8 ap_intf_id;
+
+ u8 protocol_major;
+ u8 protocol_minor;
+
+ struct gb_svc_watchdog *watchdog;
+ enum gb_svc_watchdog_bite action;
+
+ struct dentry *debugfs_dentry;
+ struct svc_debugfs_pwrmon_rail *pwrmon_rails;
+};
+#define to_gb_svc(d) container_of(d, struct gb_svc, dev)
+
+struct gb_svc *gb_svc_create(struct gb_host_device *hd);
+int gb_svc_add(struct gb_svc *svc);
+void gb_svc_del(struct gb_svc *svc);
+void gb_svc_put(struct gb_svc *svc);
+
+int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
+ u8 measurement_type, u32 *value);
+int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id);
+int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
+ u8 intf2_id, u8 dev2_id);
+void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id);
+int gb_svc_connection_create(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
+ u8 intf2_id, u16 cport2_id, u8 cport_flags);
+void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
+ u8 intf2_id, u16 cport2_id);
+int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id);
+int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable);
+int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable);
+int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable);
+int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type);
+int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id);
+
+int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
+ u32 *value);
+int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
+ u32 value);
+int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
+ u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
+ u8 tx_amplitude, u8 tx_hs_equalizer,
+ u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
+ u8 flags, u32 quirks,
+ struct gb_svc_l2_timer_cfg *local,
+ struct gb_svc_l2_timer_cfg *remote);
+int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id);
+int gb_svc_ping(struct gb_svc *svc);
+int gb_svc_watchdog_create(struct gb_svc *svc);
+void gb_svc_watchdog_destroy(struct gb_svc *svc);
+bool gb_svc_watchdog_enabled(struct gb_svc *svc);
+int gb_svc_watchdog_enable(struct gb_svc *svc);
+int gb_svc_watchdog_disable(struct gb_svc *svc);
+int gb_svc_timesync_enable(struct gb_svc *svc, u8 count, u64 frame_time,
+ u32 strobe_delay, u32 refclk);
+int gb_svc_timesync_disable(struct gb_svc *svc);
+int gb_svc_timesync_authoritative(struct gb_svc *svc, u64 *frame_time);
+int gb_svc_timesync_ping(struct gb_svc *svc, u64 *frame_time);
+int gb_svc_timesync_wake_pins_acquire(struct gb_svc *svc, u32 strobe_mask);
+int gb_svc_timesync_wake_pins_release(struct gb_svc *svc);
+
+int gb_svc_protocol_init(void);
+void gb_svc_protocol_exit(void);
+
+#endif /* __SVC_H */
--- /dev/null
+++ b/drivers/greybus/svc_watchdog.c
@@ -0,0 +1,198 @@
+/*
+ * SVC Greybus "watchdog" driver.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/delay.h>
+#include <linux/suspend.h>
+#include <linux/workqueue.h>
+#include "greybus.h"
+
+#define SVC_WATCHDOG_PERIOD (2*HZ)
+
+struct gb_svc_watchdog {
+ struct delayed_work work;
+ struct gb_svc *svc;
+ bool enabled;
+ struct notifier_block pm_notifier;
+};
+
+static struct delayed_work reset_work;
+
+static int svc_watchdog_pm_notifier(struct notifier_block *notifier,
+ unsigned long pm_event, void *unused)
+{
+ struct gb_svc_watchdog *watchdog =
+ container_of(notifier, struct gb_svc_watchdog, pm_notifier);
+
+ switch (pm_event) {
+ case PM_SUSPEND_PREPARE:
+ gb_svc_watchdog_disable(watchdog->svc);
+ break;
+ case PM_POST_SUSPEND:
+ gb_svc_watchdog_enable(watchdog->svc);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static void greybus_reset(struct work_struct *work)
+{
+ static char start_path[256] = "/system/bin/start";
+ static char *envp[] = {
+ "HOME=/",
+ "PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin",
+ NULL,
+ };
+ static char *argv[] = {
+ start_path,
+ "unipro_reset",
+ NULL,
+ };
+
+ printk(KERN_ERR "svc_watchdog: calling \"%s %s\" to reset greybus
network!\n",
+ argv[0], argv[1]);
+ call_usermodehelper(start_path, argv, envp, UMH_WAIT_EXEC);
+}
+
+static void do_work(struct work_struct *work)
+{
+ struct gb_svc_watchdog *watchdog;
+ struct gb_svc *svc;
+ int retval;
+
+ watchdog = container_of(work, struct gb_svc_watchdog, work.work);
+ svc = watchdog->svc;
+
+ dev_dbg(&svc->dev, "%s: ping.\n", __func__);
+ retval = gb_svc_ping(svc);
+ if (retval) {
+ /*
+ * Something went really wrong, let's warn userspace and then
+ * pull the plug and reset the whole greybus network.
+ * We need to do this outside of this workqueue as we will be
+ * tearing down the svc device itself. So queue up
+ * yet-another-callback to do that.
+ */
+ dev_err(&svc->dev,
+ "SVC ping has returned %d, something is wrong!!!\n",
+ retval);
+
+ if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL) {
+ panic("SVC is not responding\n");
+ } else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO) {
+ dev_err(&svc->dev, "Resetting the greybus network,
watch out!!!\n");
+
+ INIT_DELAYED_WORK(&reset_work, greybus_reset);
+ schedule_delayed_work(&reset_work, HZ / 2);
+
+ /*
+ * Disable ourselves, we don't want to trip again unless
+ * userspace wants us to.
+ */
+ watchdog->enabled = false;
+ }
+ }
+
+ /* resubmit our work to happen again, if we are still "alive" */
+ if (watchdog->enabled)
+ schedule_delayed_work(&watchdog->work, SVC_WATCHDOG_PERIOD);
+}
+
+int gb_svc_watchdog_create(struct gb_svc *svc)
+{
+ struct gb_svc_watchdog *watchdog;
+ int retval;
+
+ if (svc->watchdog)
+ return 0;
+
+ watchdog = kmalloc(sizeof(*watchdog), GFP_KERNEL);
+ if (!watchdog)
+ return -ENOMEM;
+
+ watchdog->enabled = false;
+ watchdog->svc = svc;
+ INIT_DELAYED_WORK(&watchdog->work, do_work);
+ svc->watchdog = watchdog;
+
+ watchdog->pm_notifier.notifier_call = svc_watchdog_pm_notifier;
+ retval = register_pm_notifier(&watchdog->pm_notifier);
+ if (retval) {
+ dev_err(&svc->dev, "error registering pm notifier(%d)\n",
+ retval);
+ goto svc_watchdog_create_err;
+ }
+
+ retval = gb_svc_watchdog_enable(svc);
+ if (retval) {
+ dev_err(&svc->dev, "error enabling watchdog (%d)\n", retval);
+ unregister_pm_notifier(&watchdog->pm_notifier);
+ goto svc_watchdog_create_err;
+ }
+ return retval;
+
+svc_watchdog_create_err:
+ svc->watchdog = NULL;
+ kfree(watchdog);
+
+ return retval;
+}
+
+void gb_svc_watchdog_destroy(struct gb_svc *svc)
+{
+ struct gb_svc_watchdog *watchdog = svc->watchdog;
+
+ if (!watchdog)
+ return;
+
+ unregister_pm_notifier(&watchdog->pm_notifier);
+ gb_svc_watchdog_disable(svc);
+ svc->watchdog = NULL;
+ kfree(watchdog);
+}
+
+bool gb_svc_watchdog_enabled(struct gb_svc *svc)
+{
+ if (!svc || !svc->watchdog)
+ return false;
+ return svc->watchdog->enabled;
+}
+
+int gb_svc_watchdog_enable(struct gb_svc *svc)
+{
+ struct gb_svc_watchdog *watchdog;
+
+ if (!svc->watchdog)
+ return -ENODEV;
+
+ watchdog = svc->watchdog;
+ if (watchdog->enabled)
+ return 0;
+
+ watchdog->enabled = true;
+ schedule_delayed_work(&watchdog->work, SVC_WATCHDOG_PERIOD);
+ return 0;
+}
+
+int gb_svc_watchdog_disable(struct gb_svc *svc)
+{
+ struct gb_svc_watchdog *watchdog;
+
+ if (!svc->watchdog)
+ return -ENODEV;
+
+ watchdog = svc->watchdog;
+ if (!watchdog->enabled)
+ return 0;
+
+ watchdog->enabled = false;
+ cancel_delayed_work_sync(&watchdog->work);
+ return 0;
+}
