/* * Greybus Camera protocol driver. * * Copyright 2015 Google Inc. * Copyright 2015 Linaro Ltd. * * Released under the GPLv2 only. */ #include #include #include #include #include #include #include #include #include "gb-camera.h" #include "greybus.h" #include "greybus_protocols.h" enum gb_camera_debugs_buffer_id { GB_CAMERA_DEBUGFS_BUFFER_CAPABILITIES, GB_CAMERA_DEBUGFS_BUFFER_STREAMS, GB_CAMERA_DEBUGFS_BUFFER_CAPTURE, GB_CAMERA_DEBUGFS_BUFFER_FLUSH, GB_CAMERA_DEBUGFS_BUFFER_MAX, }; struct gb_camera_debugfs_buffer { char data[PAGE_SIZE]; size_t length; }; enum gb_camera_state { GB_CAMERA_STATE_UNCONFIGURED, GB_CAMERA_STATE_CONFIGURED, }; /** * struct gb_camera - A Greybus Camera Device * @connection: the greybus connection for camera management * @data_connection: the greybus connection for camera data * @data_cport_id: the data CPort ID on the module side * @mutex: protects the connection and state fields * @state: the current module state * @debugfs: debugfs entries for camera protocol operations testing * @module: Greybus camera module registered to HOST processor. */ struct gb_camera { struct gb_bundle *bundle; struct gb_connection *connection; struct gb_connection *data_connection; u16 data_cport_id; struct mutex mutex; enum gb_camera_state state; struct { struct dentry *root; struct gb_camera_debugfs_buffer *buffers; } debugfs; struct gb_camera_module module; }; struct gb_camera_stream_config { unsigned int width; unsigned int height; unsigned int format; unsigned int vc; unsigned int dt[2]; unsigned int max_size; }; struct gb_camera_fmt_info { enum v4l2_mbus_pixelcode mbus_code; unsigned int gb_format; unsigned int bpp; }; /* GB format to media code map */ static const struct gb_camera_fmt_info gb_fmt_info[] = { { .mbus_code = V4L2_MBUS_FMT_UYVY8_1X16, .gb_format = 0x01, .bpp = 16, }, { .mbus_code = V4L2_MBUS_FMT_NV12_1x8, .gb_format = 0x12, .bpp = 12, }, { .mbus_code = V4L2_MBUS_FMT_NV21_1x8, .gb_format = 0x13, .bpp = 12, }, { .mbus_code = V4L2_MBUS_FMT_YU12_1x8, .gb_format = 0x16, .bpp = 12, }, { .mbus_code = V4L2_MBUS_FMT_YV12_1x8, .gb_format = 0x17, .bpp = 12, }, { .mbus_code = V4L2_MBUS_FMT_JPEG_1X8, .gb_format = 0x40, .bpp = 0, }, { .mbus_code = V4L2_MBUS_FMT_GB_CAM_METADATA_1X8, .gb_format = 0x41, .bpp = 0, }, { .mbus_code = V4L2_MBUS_FMT_GB_CAM_DEBUG_DATA_1X8, .gb_format = 0x42, .bpp = 0, }, { .mbus_code = V4L2_MBUS_FMT_SBGGR10_1X10, .gb_format = 0x80, .bpp = 10, }, { .mbus_code = V4L2_MBUS_FMT_SGBRG10_1X10, .gb_format = 0x81, .bpp = 10, }, { .mbus_code = V4L2_MBUS_FMT_SGRBG10_1X10, .gb_format = 0x82, .bpp = 10, }, { .mbus_code = V4L2_MBUS_FMT_SRGGB10_1X10, .gb_format = 0x83, .bpp = 10, }, { .mbus_code = V4L2_MBUS_FMT_SBGGR12_1X12, .gb_format = 0x84, .bpp = 12, }, { .mbus_code = V4L2_MBUS_FMT_SGBRG12_1X12, .gb_format = 0x85, .bpp = 12, }, { .mbus_code = V4L2_MBUS_FMT_SGRBG12_1X12, .gb_format = 0x86, .bpp = 12, }, { .mbus_code = V4L2_MBUS_FMT_SRGGB12_1X12, .gb_format = 0x87, .bpp = 12, }, }; static const struct gb_camera_fmt_info *gb_camera_get_format_info(u16 gb_fmt) { unsigned int i; for (i = 0; i < ARRAY_SIZE(gb_fmt_info); i++) { if (gb_fmt_info[i].gb_format == gb_fmt) return &gb_fmt_info[i]; } return NULL; } #define ES2_APB_CDSI0_CPORT 16 #define ES2_APB_CDSI1_CPORT 17 #define GB_CAMERA_MAX_SETTINGS_SIZE 8192 #define gcam_dbg(gcam, format...) dev_dbg(&gcam->bundle->dev, format) #define gcam_info(gcam, format...) dev_info(&gcam->bundle->dev, format) #define gcam_err(gcam, format...) dev_err(&gcam->bundle->dev, format) static int gb_camera_operation_sync_flags(struct gb_connection *connection, int type, unsigned int flags, void *request, size_t request_size, void *response, size_t *response_size) { struct gb_operation *operation; int ret; operation = gb_operation_create_flags(connection, type, request_size, *response_size, flags, GFP_KERNEL); if (!operation) return -ENOMEM; if (request_size) memcpy(operation->request->payload, request, request_size); ret = gb_operation_request_send_sync(operation); if (ret) { dev_err(&connection->hd->dev, "%s: synchronous operation of type 0x%02x failed: %d\n", connection->name, type, ret); } else { *response_size = operation->response->payload_size; if (operation->response->payload_size) memcpy(response, operation->response->payload, operation->response->payload_size); } gb_operation_put(operation); return ret; } static int gb_camera_get_max_pkt_size(struct gb_camera *gcam, struct gb_camera_configure_streams_response *resp) { unsigned int max_pkt_size = 0; unsigned int i; for (i = 0; i < resp->num_streams; i++) { struct gb_camera_stream_config_response *cfg = &resp->config[i]; const struct gb_camera_fmt_info *fmt_info; unsigned int pkt_size; fmt_info = gb_camera_get_format_info(cfg->format); if (!fmt_info) { gcam_err(gcam, "unsupported greybus image format: %d\n", cfg->format); return -EIO; } if (fmt_info->bpp == 0) { pkt_size = le32_to_cpu(cfg->max_pkt_size); if (pkt_size == 0) { gcam_err(gcam, "Stream %u: invalid zero maximum packet size\n", i); return -EIO; } } else { pkt_size = le16_to_cpu(cfg->width) * fmt_info->bpp / 8; if (pkt_size != le32_to_cpu(cfg->max_pkt_size)) { gcam_err(gcam, "Stream %u: maximum packet size mismatch (%u/%u)\n", i, pkt_size, cfg->max_pkt_size); return -EIO; } } max_pkt_size = max(pkt_size, max_pkt_size); } return max_pkt_size; } /* * Validate the stream configuration response verifying padding is correctly * set and the returned number of streams is supported */ static const int gb_camera_configure_streams_validate_response( struct gb_camera *gcam, struct gb_camera_configure_streams_response *resp, unsigned int nstreams) { unsigned int i; /* Validate the returned response structure */ if (resp->padding[0] || resp->padding[1]) { gcam_err(gcam, "response padding != 0\n"); return -EIO; } if (resp->num_streams > nstreams) { gcam_err(gcam, "got #streams %u > request %u\n", resp->num_streams, nstreams); return -EIO; } for (i = 0; i < resp->num_streams; i++) { struct gb_camera_stream_config_response *cfg = &resp->config[i]; if (cfg->padding) { gcam_err(gcam, "stream #%u padding != 0\n", i); return -EIO; } } return 0; } /* ----------------------------------------------------------------------------- * Hardware Configuration */ static int gb_camera_set_intf_power_mode(struct gb_camera *gcam, u8 intf_id, bool hs) { struct gb_svc *svc = gcam->connection->hd->svc; int ret; if (hs) ret = gb_svc_intf_set_power_mode(svc, intf_id, GB_SVC_UNIPRO_HS_SERIES_A, GB_SVC_UNIPRO_FAST_MODE, 2, 2, GB_SVC_SMALL_AMPLITUDE, GB_SVC_NO_DE_EMPHASIS, GB_SVC_UNIPRO_FAST_MODE, 2, 2, GB_SVC_PWRM_RXTERMINATION | GB_SVC_PWRM_TXTERMINATION, 0, NULL, NULL); else ret = gb_svc_intf_set_power_mode(svc, 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); return ret; } static int gb_camera_set_power_mode(struct gb_camera *gcam, bool hs) { struct gb_interface *intf = gcam->connection->intf; struct gb_svc *svc = gcam->connection->hd->svc; int ret; ret = gb_camera_set_intf_power_mode(gcam, intf->interface_id, hs); if (ret < 0) { gcam_err(gcam, "failed to set module interface to %s (%d)\n", hs ? "HS" : "PWM", ret); return ret; } ret = gb_camera_set_intf_power_mode(gcam, svc->ap_intf_id, hs); if (ret < 0) { gb_camera_set_intf_power_mode(gcam, intf->interface_id, !hs); gcam_err(gcam, "failed to set AP interface to %s (%d)\n", hs ? "HS" : "PWM", ret); return ret; } return 0; } struct ap_csi_config_request { __u8 csi_id; __u8 flags; #define GB_CAMERA_CSI_FLAG_CLOCK_CONTINUOUS 0x01 __u8 num_lanes; __u8 padding; __le32 csi_clk_freq; __le32 max_pkt_size; } __packed; /* * TODO: Compute the number of lanes dynamically based on bandwidth * requirements. */ #define GB_CAMERA_CSI_NUM_DATA_LANES 4 #define GB_CAMERA_CSI_CLK_FREQ_MAX 999000000U #define GB_CAMERA_CSI_CLK_FREQ_MIN 100000000U #define GB_CAMERA_CSI_CLK_FREQ_MARGIN 150000000U static int gb_camera_setup_data_connection(struct gb_camera *gcam, struct gb_camera_configure_streams_response *resp, struct gb_camera_csi_params *csi_params) { struct ap_csi_config_request csi_cfg; struct gb_connection *conn; unsigned int clk_freq; int ret; /* * Create the data connection between the camera module data CPort and * APB CDSI1. The CDSI1 CPort ID is hardcoded by the ES2 bridge. */ conn = gb_connection_create_offloaded(gcam->bundle, gcam->data_cport_id, GB_CONNECTION_FLAG_NO_FLOWCTRL | GB_CONNECTION_FLAG_CDSI1); if (IS_ERR(conn)) return PTR_ERR(conn); gcam->data_connection = conn; gb_connection_set_data(conn, gcam); ret = gb_connection_enable(conn); if (ret) goto error_conn_destroy; /* Set the UniPro link to high speed mode. */ ret = gb_camera_set_power_mode(gcam, true); if (ret < 0) goto error_conn_disable; /* * Configure the APB-A CSI-2 transmitter. * * Hardcode the number of lanes to 4 and compute the bus clock frequency * based on the module bandwidth requirements with a safety margin. */ memset(&csi_cfg, 0, sizeof(csi_cfg)); csi_cfg.csi_id = 1; csi_cfg.flags = 0; csi_cfg.num_lanes = GB_CAMERA_CSI_NUM_DATA_LANES; clk_freq = resp->data_rate / 2 / GB_CAMERA_CSI_NUM_DATA_LANES; clk_freq = clamp(clk_freq + GB_CAMERA_CSI_CLK_FREQ_MARGIN, GB_CAMERA_CSI_CLK_FREQ_MIN, GB_CAMERA_CSI_CLK_FREQ_MAX); csi_cfg.csi_clk_freq = clk_freq; ret = gb_camera_get_max_pkt_size(gcam, resp); if (ret < 0) { ret = -EIO; goto error_power; } csi_cfg.max_pkt_size = ret; ret = gb_hd_output(gcam->connection->hd, &csi_cfg, sizeof(csi_cfg), GB_APB_REQUEST_CSI_TX_CONTROL, false); if (ret < 0) { gcam_err(gcam, "failed to start the CSI transmitter\n"); goto error_power; } if (csi_params) { csi_params->clk_freq = csi_cfg.csi_clk_freq; csi_params->num_lanes = csi_cfg.num_lanes; } return 0; error_power: gb_camera_set_power_mode(gcam, false); error_conn_disable: gb_connection_disable(gcam->data_connection); error_conn_destroy: gb_connection_destroy(gcam->data_connection); gcam->data_connection = NULL; return ret; } static void gb_camera_teardown_data_connection(struct gb_camera *gcam) { struct ap_csi_config_request csi_cfg; int ret; /* Stop the APB1 CSI transmitter. */ memset(&csi_cfg, 0, sizeof(csi_cfg)); csi_cfg.csi_id = 1; ret = gb_hd_output(gcam->connection->hd, &csi_cfg, sizeof(csi_cfg), GB_APB_REQUEST_CSI_TX_CONTROL, false); if (ret < 0) gcam_err(gcam, "failed to stop the CSI transmitter\n"); /* Set the UniPro link to low speed mode. */ gb_camera_set_power_mode(gcam, false); /* Destroy the data connection. */ gb_connection_disable(gcam->data_connection); gb_connection_destroy(gcam->data_connection); gcam->data_connection = NULL; } /* ----------------------------------------------------------------------------- * Camera Protocol Operations */ static int gb_camera_capabilities(struct gb_camera *gcam, u8 *capabilities, size_t *size) { int ret; ret = gb_pm_runtime_get_sync(gcam->bundle); if (ret) return ret; mutex_lock(&gcam->mutex); if (!gcam->connection) { ret = -EINVAL; goto done; } ret = gb_camera_operation_sync_flags(gcam->connection, GB_CAMERA_TYPE_CAPABILITIES, GB_OPERATION_FLAG_SHORT_RESPONSE, NULL, 0, (void *)capabilities, size); if (ret) gcam_err(gcam, "failed to retrieve capabilities: %d\n", ret); done: mutex_unlock(&gcam->mutex); gb_pm_runtime_put_autosuspend(gcam->bundle); return ret; } static int gb_camera_configure_streams(struct gb_camera *gcam, unsigned int *num_streams, unsigned int *flags, struct gb_camera_stream_config *streams, struct gb_camera_csi_params *csi_params) { struct gb_camera_configure_streams_request *req; struct gb_camera_configure_streams_response *resp; unsigned int nstreams = *num_streams; unsigned int i; size_t req_size; size_t resp_size; int ret; if (nstreams > GB_CAMERA_MAX_STREAMS) return -EINVAL; req_size = sizeof(*req) + nstreams * sizeof(req->config[0]); resp_size = sizeof(*resp) + nstreams * sizeof(resp->config[0]); req = kmalloc(req_size, GFP_KERNEL); resp = kmalloc(resp_size, GFP_KERNEL); if (!req || !resp) { kfree(req); kfree(resp); return -ENOMEM; } req->num_streams = nstreams; req->flags = *flags; req->padding = 0; for (i = 0; i < nstreams; ++i) { struct gb_camera_stream_config_request *cfg = &req->config[i]; cfg->width = cpu_to_le16(streams[i].width); cfg->height = cpu_to_le16(streams[i].height); cfg->format = cpu_to_le16(streams[i].format); cfg->padding = 0; } mutex_lock(&gcam->mutex); ret = gb_pm_runtime_get_sync(gcam->bundle); if (ret) goto done_skip_pm_put; if (!gcam->connection) { ret = -EINVAL; goto done; } ret = gb_camera_operation_sync_flags(gcam->connection, GB_CAMERA_TYPE_CONFIGURE_STREAMS, GB_OPERATION_FLAG_SHORT_RESPONSE, req, req_size, resp, &resp_size); if (ret < 0) goto done; ret = gb_camera_configure_streams_validate_response(gcam, resp, nstreams); if (ret < 0) goto done; *flags = resp->flags; *num_streams = resp->num_streams; for (i = 0; i < resp->num_streams; ++i) { struct gb_camera_stream_config_response *cfg = &resp->config[i]; streams[i].width = le16_to_cpu(cfg->width); streams[i].height = le16_to_cpu(cfg->height); streams[i].format = le16_to_cpu(cfg->format); streams[i].vc = cfg->virtual_channel; streams[i].dt[0] = cfg->data_type[0]; streams[i].dt[1] = cfg->data_type[1]; streams[i].max_size = le32_to_cpu(cfg->max_size); } if ((resp->flags & GB_CAMERA_CONFIGURE_STREAMS_ADJUSTED) || (req->flags & GB_CAMERA_CONFIGURE_STREAMS_TEST_ONLY)) goto done; if (gcam->state == GB_CAMERA_STATE_CONFIGURED) { gb_camera_teardown_data_connection(gcam); gcam->state = GB_CAMERA_STATE_UNCONFIGURED; /* * When unconfiguring streams release the PM runtime reference * that was acquired when streams were configured. The bundle * won't be suspended until the PM runtime reference acquired at * the beginning of this function gets released right before * returning. */ gb_pm_runtime_put_noidle(gcam->bundle); } if (resp->num_streams == 0) goto done; /* * Make sure the bundle won't be suspended until streams get * unconfigured after the stream is configured successfully */ gb_pm_runtime_get_noresume(gcam->bundle); /* Setup CSI-2 connection from APB-A to AP */ ret = gb_camera_setup_data_connection(gcam, resp, csi_params); if (ret < 0) { memset(req, 0, sizeof(*req)); gb_operation_sync(gcam->connection, GB_CAMERA_TYPE_CONFIGURE_STREAMS, req, sizeof(*req), resp, sizeof(*resp)); *flags = 0; *num_streams = 0; gb_pm_runtime_put_noidle(gcam->bundle); goto done; } gcam->state = GB_CAMERA_STATE_CONFIGURED; done: gb_pm_runtime_put_autosuspend(gcam->bundle); done_skip_pm_put: mutex_unlock(&gcam->mutex); kfree(req); kfree(resp); return ret; } static int gb_camera_capture(struct gb_camera *gcam, u32 request_id, unsigned int streams, unsigned int num_frames, size_t settings_size, const void *settings) { struct gb_camera_capture_request *req; size_t req_size; int ret; if (settings_size > GB_CAMERA_MAX_SETTINGS_SIZE) return -EINVAL; req_size = sizeof(*req) + settings_size; req = kmalloc(req_size, GFP_KERNEL); if (!req) return -ENOMEM; req->request_id = cpu_to_le32(request_id); req->streams = streams; req->padding = 0; req->num_frames = cpu_to_le16(num_frames); memcpy(req->settings, settings, settings_size); mutex_lock(&gcam->mutex); if (!gcam->connection) { ret = -EINVAL; goto done; } ret = gb_operation_sync(gcam->connection, GB_CAMERA_TYPE_CAPTURE, req, req_size, NULL, 0); done: mutex_unlock(&gcam->mutex); kfree(req); return ret; } static int gb_camera_flush(struct gb_camera *gcam, u32 *request_id) { struct gb_camera_flush_response resp; int ret; mutex_lock(&gcam->mutex); if (!gcam->connection) { ret = -EINVAL; goto done; } ret = gb_operation_sync(gcam->connection, GB_CAMERA_TYPE_FLUSH, NULL, 0, &resp, sizeof(resp)); if (ret < 0) goto done; if (request_id) *request_id = le32_to_cpu(resp.request_id); done: mutex_unlock(&gcam->mutex); return ret; } static int gb_camera_request_handler(struct gb_operation *op) { struct gb_camera *gcam = gb_connection_get_data(op->connection); struct gb_camera_metadata_request *payload; struct gb_message *request; if (op->type != GB_CAMERA_TYPE_METADATA) { gcam_err(gcam, "Unsupported unsolicited event: %u\n", op->type); return -EINVAL; } request = op->request; if (request->payload_size < sizeof(*payload)) { gcam_err(gcam, "Wrong event size received (%zu < %zu)\n", request->payload_size, sizeof(*payload)); return -EINVAL; } payload = request->payload; gcam_dbg(gcam, "received metadata for request %u, frame %u, stream %u\n", payload->request_id, payload->frame_number, payload->stream); return 0; } /* ----------------------------------------------------------------------------- * Interface with HOST gmp camera. */ static unsigned int gb_camera_mbus_to_gb(enum v4l2_mbus_pixelcode mbus_code) { unsigned int i; for (i = 0; i < ARRAY_SIZE(gb_fmt_info); i++) { if (gb_fmt_info[i].mbus_code == mbus_code) return gb_fmt_info[i].gb_format; } return gb_fmt_info[0].gb_format; } static enum v4l2_mbus_pixelcode gb_camera_gb_to_mbus(u16 gb_fmt) { unsigned int i; for (i = 0; i < ARRAY_SIZE(gb_fmt_info); i++) { if (gb_fmt_info[i].gb_format == gb_fmt) return gb_fmt_info[i].mbus_code; } return gb_fmt_info[0].mbus_code; } static ssize_t gb_camera_op_capabilities(void *priv, char *data, size_t len) { struct gb_camera *gcam = priv; size_t capabilities_len = len; int ret; ret = gb_camera_capabilities(gcam, data, &capabilities_len); if (ret) return ret; return capabilities_len; } static int gb_camera_op_configure_streams(void *priv, unsigned int *nstreams, unsigned int *flags, struct gb_camera_stream *streams, struct gb_camera_csi_params *csi_params) { struct gb_camera *gcam = priv; struct gb_camera_stream_config *gb_streams; unsigned int gb_flags = 0; unsigned int gb_nstreams = *nstreams; unsigned int i; int ret; if (gb_nstreams > GB_CAMERA_MAX_STREAMS) return -EINVAL; gb_streams = kcalloc(gb_nstreams, sizeof(*gb_streams), GFP_KERNEL); if (!gb_streams) return -ENOMEM; for (i = 0; i < gb_nstreams; i++) { gb_streams[i].width = streams[i].width; gb_streams[i].height = streams[i].height; gb_streams[i].format = gb_camera_mbus_to_gb(streams[i].pixel_code); } if (*flags & GB_CAMERA_IN_FLAG_TEST) gb_flags |= GB_CAMERA_CONFIGURE_STREAMS_TEST_ONLY; ret = gb_camera_configure_streams(gcam, &gb_nstreams, &gb_flags, gb_streams, csi_params); if (ret < 0) goto done; if (gb_nstreams > *nstreams) { ret = -EINVAL; goto done; } *flags = 0; if (gb_flags & GB_CAMERA_CONFIGURE_STREAMS_ADJUSTED) *flags |= GB_CAMERA_OUT_FLAG_ADJUSTED; for (i = 0; i < gb_nstreams; i++) { streams[i].width = gb_streams[i].width; streams[i].height = gb_streams[i].height; streams[i].vc = gb_streams[i].vc; streams[i].dt[0] = gb_streams[i].dt[0]; streams[i].dt[1] = gb_streams[i].dt[1]; streams[i].max_size = gb_streams[i].max_size; streams[i].pixel_code = gb_camera_gb_to_mbus(gb_streams[i].format); } *nstreams = gb_nstreams; done: kfree(gb_streams); return ret; } static int gb_camera_op_capture(void *priv, u32 request_id, unsigned int streams, unsigned int num_frames, size_t settings_size, const void *settings) { struct gb_camera *gcam = priv; return gb_camera_capture(gcam, request_id, streams, num_frames, settings_size, settings); } static int gb_camera_op_flush(void *priv, u32 *request_id) { struct gb_camera *gcam = priv; return gb_camera_flush(gcam, request_id); } static const struct gb_camera_ops gb_cam_ops = { .capabilities = gb_camera_op_capabilities, .configure_streams = gb_camera_op_configure_streams, .capture = gb_camera_op_capture, .flush = gb_camera_op_flush, }; /* ----------------------------------------------------------------------------- * DebugFS */ static ssize_t gb_camera_debugfs_capabilities(struct gb_camera *gcam, char *buf, size_t len) { struct gb_camera_debugfs_buffer *buffer = &gcam->debugfs.buffers[GB_CAMERA_DEBUGFS_BUFFER_CAPABILITIES]; size_t size = 1024; unsigned int i; u8 *caps; int ret; caps = kmalloc(size, GFP_KERNEL); if (!caps) return -ENOMEM; ret = gb_camera_capabilities(gcam, caps, &size); if (ret < 0) goto done; /* * hex_dump_to_buffer() doesn't return the number of bytes dumped prior * to v4.0, we need our own implementation :-( */ buffer->length = 0; for (i = 0; i < size; i += 16) { unsigned int nbytes = min_t(unsigned int, size - i, 16); buffer->length += sprintf(buffer->data + buffer->length, "%*ph\n", nbytes, caps + i); } done: kfree(caps); return ret; } static ssize_t gb_camera_debugfs_configure_streams(struct gb_camera *gcam, char *buf, size_t len) { struct gb_camera_debugfs_buffer *buffer = &gcam->debugfs.buffers[GB_CAMERA_DEBUGFS_BUFFER_STREAMS]; struct gb_camera_stream_config *streams; unsigned int nstreams; unsigned int flags; unsigned int i; char *token; int ret; /* Retrieve number of streams to configure */ token = strsep(&buf, ";"); if (token == NULL) return -EINVAL; ret = kstrtouint(token, 10, &nstreams); if (ret < 0) return ret; if (nstreams > GB_CAMERA_MAX_STREAMS) return -EINVAL; token = strsep(&buf, ";"); if (token == NULL) return -EINVAL; ret = kstrtouint(token, 10, &flags); if (ret < 0) return ret; /* For each stream to configure parse width, height and format */ streams = kcalloc(nstreams, sizeof(*streams), GFP_KERNEL); if (!streams) return -ENOMEM; for (i = 0; i < nstreams; ++i) { struct gb_camera_stream_config *stream = &streams[i]; /* width */ token = strsep(&buf, ";"); if (token == NULL) { ret = -EINVAL; goto done; } ret = kstrtouint(token, 10, &stream->width); if (ret < 0) goto done; /* height */ token = strsep(&buf, ";"); if (token == NULL) goto done; ret = kstrtouint(token, 10, &stream->height); if (ret < 0) goto done; /* Image format code */ token = strsep(&buf, ";"); if (token == NULL) goto done; ret = kstrtouint(token, 16, &stream->format); if (ret < 0) goto done; } ret = gb_camera_configure_streams(gcam, &nstreams, &flags, streams, NULL); if (ret < 0) goto done; buffer->length = sprintf(buffer->data, "%u;%u;", nstreams, flags); for (i = 0; i < nstreams; ++i) { struct gb_camera_stream_config *stream = &streams[i]; buffer->length += sprintf(buffer->data + buffer->length, "%u;%u;%u;%u;%u;%u;%u;", stream->width, stream->height, stream->format, stream->vc, stream->dt[0], stream->dt[1], stream->max_size); } ret = len; done: kfree(streams); return ret; }; static ssize_t gb_camera_debugfs_capture(struct gb_camera *gcam, char *buf, size_t len) { unsigned int request_id; unsigned int streams_mask; unsigned int num_frames; char *token; int ret; /* Request id */ token = strsep(&buf, ";"); if (token == NULL) return -EINVAL; ret = kstrtouint(token, 10, &request_id); if (ret < 0) return ret; /* Stream mask */ token = strsep(&buf, ";"); if (token == NULL) return -EINVAL; ret = kstrtouint(token, 16, &streams_mask); if (ret < 0) return ret; /* number of frames */ token = strsep(&buf, ";"); if (token == NULL) return -EINVAL; ret = kstrtouint(token, 10, &num_frames); if (ret < 0) return ret; ret = gb_camera_capture(gcam, request_id, streams_mask, num_frames, 0, NULL); if (ret < 0) return ret; return len; } static ssize_t gb_camera_debugfs_flush(struct gb_camera *gcam, char *buf, size_t len) { struct gb_camera_debugfs_buffer *buffer = &gcam->debugfs.buffers[GB_CAMERA_DEBUGFS_BUFFER_FLUSH]; unsigned int req_id; int ret; ret = gb_camera_flush(gcam, &req_id); if (ret < 0) return ret; buffer->length = sprintf(buffer->data, "%u", req_id); return len; } struct gb_camera_debugfs_entry { const char *name; unsigned int mask; unsigned int buffer; ssize_t (*execute)(struct gb_camera *gcam, char *buf, size_t len); }; static const struct gb_camera_debugfs_entry gb_camera_debugfs_entries[] = { { .name = "capabilities", .mask = S_IFREG | S_IRUGO, .buffer = GB_CAMERA_DEBUGFS_BUFFER_CAPABILITIES, .execute = gb_camera_debugfs_capabilities, }, { .name = "configure_streams", .mask = S_IFREG | S_IRUGO | S_IWUGO, .buffer = GB_CAMERA_DEBUGFS_BUFFER_STREAMS, .execute = gb_camera_debugfs_configure_streams, }, { .name = "capture", .mask = S_IFREG | S_IRUGO | S_IWUGO, .buffer = GB_CAMERA_DEBUGFS_BUFFER_CAPTURE, .execute = gb_camera_debugfs_capture, }, { .name = "flush", .mask = S_IFREG | S_IRUGO | S_IWUGO, .buffer = GB_CAMERA_DEBUGFS_BUFFER_FLUSH, .execute = gb_camera_debugfs_flush, }, }; static ssize_t gb_camera_debugfs_read(struct file *file, char __user *buf, size_t len, loff_t *offset) { const struct gb_camera_debugfs_entry *op = file->private_data; struct gb_camera *gcam = file_inode(file)->i_private; struct gb_camera_debugfs_buffer *buffer; ssize_t ret; /* For read-only entries the operation is triggered by a read. */ if (!(op->mask & S_IWUGO)) { ret = op->execute(gcam, NULL, 0); if (ret < 0) return ret; } buffer = &gcam->debugfs.buffers[op->buffer]; return simple_read_from_buffer(buf, len, offset, buffer->data, buffer->length); } static ssize_t gb_camera_debugfs_write(struct file *file, const char __user *buf, size_t len, loff_t *offset) { const struct gb_camera_debugfs_entry *op = file->private_data; struct gb_camera *gcam = file_inode(file)->i_private; ssize_t ret; char *kbuf; if (len > 1024) return -EINVAL; kbuf = kmalloc(len + 1, GFP_KERNEL); if (!kbuf) return -ENOMEM; if (copy_from_user(kbuf, buf, len)) { ret = -EFAULT; goto done; } kbuf[len] = '\0'; ret = op->execute(gcam, kbuf, len); done: kfree(kbuf); return ret; } static int gb_camera_debugfs_open(struct inode *inode, struct file *file) { unsigned int i; for (i = 0; i < ARRAY_SIZE(gb_camera_debugfs_entries); ++i) { const struct gb_camera_debugfs_entry *entry = &gb_camera_debugfs_entries[i]; if (!strcmp(file->f_path.dentry->d_iname, entry->name)) { file->private_data = (void *)entry; break; } } return 0; } static const struct file_operations gb_camera_debugfs_ops = { .open = gb_camera_debugfs_open, .read = gb_camera_debugfs_read, .write = gb_camera_debugfs_write, }; static int gb_camera_debugfs_init(struct gb_camera *gcam) { struct gb_connection *connection = gcam->connection; char dirname[27]; unsigned int i; /* * Create root debugfs entry and a file entry for each camera operation. */ snprintf(dirname, 27, "camera-%u.%u", connection->intf->interface_id, gcam->bundle->id); gcam->debugfs.root = debugfs_create_dir(dirname, gb_debugfs_get()); if (IS_ERR(gcam->debugfs.root)) { gcam_err(gcam, "debugfs root create failed (%ld)\n", PTR_ERR(gcam->debugfs.root)); return PTR_ERR(gcam->debugfs.root); } gcam->debugfs.buffers = vmalloc(sizeof(*gcam->debugfs.buffers) * GB_CAMERA_DEBUGFS_BUFFER_MAX); if (!gcam->debugfs.buffers) return -ENOMEM; for (i = 0; i < ARRAY_SIZE(gb_camera_debugfs_entries); ++i) { const struct gb_camera_debugfs_entry *entry = &gb_camera_debugfs_entries[i]; struct dentry *dentry; gcam->debugfs.buffers[i].length = 0; dentry = debugfs_create_file(entry->name, entry->mask, gcam->debugfs.root, gcam, &gb_camera_debugfs_ops); if (IS_ERR(dentry)) { gcam_err(gcam, "debugfs operation %s create failed (%ld)\n", entry->name, PTR_ERR(dentry)); return PTR_ERR(dentry); } } return 0; } static void gb_camera_debugfs_cleanup(struct gb_camera *gcam) { debugfs_remove_recursive(gcam->debugfs.root); vfree(gcam->debugfs.buffers); } /* ----------------------------------------------------------------------------- * Init & Cleanup */ static void gb_camera_cleanup(struct gb_camera *gcam) { gb_camera_debugfs_cleanup(gcam); mutex_lock(&gcam->mutex); if (gcam->data_connection) { gb_connection_disable(gcam->data_connection); gb_connection_destroy(gcam->data_connection); gcam->data_connection = NULL; } if (gcam->connection) { gb_connection_disable(gcam->connection); gb_connection_destroy(gcam->connection); gcam->connection = NULL; } mutex_unlock(&gcam->mutex); } static void gb_camera_release_module(struct kref *ref) { struct gb_camera_module *cam_mod = container_of(ref, struct gb_camera_module, refcount); kfree(cam_mod->priv); } static int gb_camera_probe(struct gb_bundle *bundle, const struct greybus_bundle_id *id) { struct gb_connection *conn; struct gb_camera *gcam; u16 mgmt_cport_id = 0; u16 data_cport_id = 0; unsigned int i; int ret; /* * The camera bundle must contain exactly two CPorts, one for the * camera management protocol and one for the camera data protocol. */ if (bundle->num_cports != 2) return -ENODEV; for (i = 0; i < bundle->num_cports; ++i) { struct greybus_descriptor_cport *desc = &bundle->cport_desc[i]; switch (desc->protocol_id) { case GREYBUS_PROTOCOL_CAMERA_MGMT: mgmt_cport_id = le16_to_cpu(desc->id); break; case GREYBUS_PROTOCOL_CAMERA_DATA: data_cport_id = le16_to_cpu(desc->id); break; default: return -ENODEV; } } if (!mgmt_cport_id || !data_cport_id) return -ENODEV; gcam = kzalloc(sizeof(*gcam), GFP_KERNEL); if (!gcam) return -ENOMEM; mutex_init(&gcam->mutex); gcam->bundle = bundle; gcam->state = GB_CAMERA_STATE_UNCONFIGURED; gcam->data_cport_id = data_cport_id; conn = gb_connection_create(bundle, mgmt_cport_id, gb_camera_request_handler); if (IS_ERR(conn)) { ret = PTR_ERR(conn); goto error; } gcam->connection = conn; gb_connection_set_data(conn, gcam); ret = gb_connection_enable(conn); if (ret) goto error; ret = gb_camera_debugfs_init(gcam); if (ret < 0) goto error; gcam->module.priv = gcam; gcam->module.ops = &gb_cam_ops; gcam->module.interface_id = gcam->connection->intf->interface_id; gcam->module.release = gb_camera_release_module; ret = gb_camera_register(&gcam->module); if (ret < 0) goto error; greybus_set_drvdata(bundle, gcam); gb_pm_runtime_put_autosuspend(gcam->bundle); return 0; error: gb_camera_cleanup(gcam); kfree(gcam); return ret; } static void gb_camera_disconnect(struct gb_bundle *bundle) { struct gb_camera *gcam = greybus_get_drvdata(bundle); int ret; ret = gb_pm_runtime_get_sync(bundle); if (ret) gb_pm_runtime_get_noresume(bundle); gb_camera_cleanup(gcam); gb_camera_unregister(&gcam->module); } static const struct greybus_bundle_id gb_camera_id_table[] = { { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_CAMERA) }, { }, }; #ifdef CONFIG_PM static int gb_camera_suspend(struct device *dev) { struct gb_bundle *bundle = to_gb_bundle(dev); struct gb_camera *gcam = greybus_get_drvdata(bundle); if (gcam->data_connection) gb_connection_disable(gcam->data_connection); gb_connection_disable(gcam->connection); return 0; } static int gb_camera_resume(struct device *dev) { struct gb_bundle *bundle = to_gb_bundle(dev); struct gb_camera *gcam = greybus_get_drvdata(bundle); int ret; ret = gb_connection_enable(gcam->connection); if (ret) { gcam_err(gcam, "failed to enable connection: %d\n", ret); return ret; } if (gcam->data_connection) { ret = gb_connection_enable(gcam->data_connection); if (ret) { gcam_err(gcam, "failed to enable data connection: %d\n", ret); return ret; } } return 0; } #endif static const struct dev_pm_ops gb_camera_pm_ops = { SET_RUNTIME_PM_OPS(gb_camera_suspend, gb_camera_resume, NULL) }; static struct greybus_driver gb_camera_driver = { .name = "camera", .probe = gb_camera_probe, .disconnect = gb_camera_disconnect, .id_table = gb_camera_id_table, .driver.pm = &gb_camera_pm_ops, }; module_greybus_driver(gb_camera_driver); MODULE_LICENSE("GPL v2");