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    Subject[patch 06/32] greybus: svc driver/watchdog
    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 <gregkh@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;
    +}

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     \ /
      Last update: 2016-09-17 09:59    [W:4.839 / U:0.324 seconds]
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