diff options
Diffstat (limited to 'drivers/staging/greybus/svc.c')
| -rw-r--r-- | drivers/staging/greybus/svc.c | 1398 |
1 files changed, 0 insertions, 1398 deletions
diff --git a/drivers/staging/greybus/svc.c b/drivers/staging/greybus/svc.c deleted file mode 100644 index 05bc45287b87..000000000000 --- a/drivers/staging/greybus/svc.c +++ /dev/null @@ -1,1398 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * SVC Greybus driver. - * - * Copyright 2015 Google Inc. - * Copyright 2015 Linaro Ltd. - */ - -#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); - } -} - -/* 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_inode(file)->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_inode(file)->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_inode(file)->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", 0444, dir, rail, - &pwrmon_debugfs_voltage_fops); - debugfs_create_file("current_now", 0444, dir, rail, - &pwrmon_debugfs_current_fops); - debugfs_create_file("power_now", 0444, 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); - - 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; - - 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; - - /* 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_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); -} |