1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2d67c46b9STakashi Sakamoto #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED 3d67c46b9STakashi Sakamoto #define SOUND_FIREWIRE_AMDTP_H_INCLUDED 4d67c46b9STakashi Sakamoto 5d67c46b9STakashi Sakamoto #include <linux/err.h> 6d67c46b9STakashi Sakamoto #include <linux/interrupt.h> 7d67c46b9STakashi Sakamoto #include <linux/mutex.h> 85955815eSTakashi Sakamoto #include <linux/sched.h> 9d67c46b9STakashi Sakamoto #include <sound/asound.h> 10d67c46b9STakashi Sakamoto #include "packets-buffer.h" 11d67c46b9STakashi Sakamoto 12d67c46b9STakashi Sakamoto /** 13d67c46b9STakashi Sakamoto * enum cip_flags - describes details of the streaming protocol 14d67c46b9STakashi Sakamoto * @CIP_NONBLOCKING: In non-blocking mode, each packet contains 15d67c46b9STakashi Sakamoto * sample_rate/8000 samples, with rounding up or down to adjust 16d67c46b9STakashi Sakamoto * for clock skew and left-over fractional samples. This should 17d67c46b9STakashi Sakamoto * be used if supported by the device. 18d67c46b9STakashi Sakamoto * @CIP_BLOCKING: In blocking mode, each packet contains either zero or 19d67c46b9STakashi Sakamoto * SYT_INTERVAL samples, with these two types alternating so that 20d67c46b9STakashi Sakamoto * the overall sample rate comes out right. 21d67c46b9STakashi Sakamoto * @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0. 229dae017bSTakashi Sakamoto * @CIP_DBC_IS_END_EVENT: The value of dbc in an packet corresponds to the end 239dae017bSTakashi Sakamoto * of event in the packet. Out of IEC 61883. 24d67c46b9STakashi Sakamoto * @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets. 25d67c46b9STakashi Sakamoto * The value of data_block_quadlets is used instead of reported value. 26d67c46b9STakashi Sakamoto * @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is 27d67c46b9STakashi Sakamoto * skipped for detecting discontinuity. 28d67c46b9STakashi Sakamoto * @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty 29d67c46b9STakashi Sakamoto * packet is wrong but the others are correct. 30d67c46b9STakashi Sakamoto * @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an 31d67c46b9STakashi Sakamoto * packet is larger than IEC 61883-6 defines. Current implementation 32d67c46b9STakashi Sakamoto * allows 5 times as large as IEC 61883-6 defines. 332128f78fSTakashi Sakamoto * @CIP_HEADER_WITHOUT_EOH: Only for in-stream. CIP Header doesn't include 342128f78fSTakashi Sakamoto * valid EOH. 353b196c39STakashi Sakamoto * @CIP_NO_HEADERS: a lack of headers in packets 36588f2e2cSTakashi Sakamoto * @CIP_UNALIGHED_DBC: Only for in-stream. The value of dbc is not alighed to 37588f2e2cSTakashi Sakamoto * the value of current SYT_INTERVAL; e.g. initial value is not zero. 38*8070d265STakashi Sakamoto * @CIP_UNAWARE_SYT: For outgoing packet, the value in SYT field of CIP is 0xffff. 39*8070d265STakashi Sakamoto * For incoming packet, the value in SYT field of CIP is not handled. 40d67c46b9STakashi Sakamoto */ 41d67c46b9STakashi Sakamoto enum cip_flags { 42d67c46b9STakashi Sakamoto CIP_NONBLOCKING = 0x00, 43d67c46b9STakashi Sakamoto CIP_BLOCKING = 0x01, 44dec63cc8STakashi Sakamoto CIP_EMPTY_WITH_TAG0 = 0x02, 45dec63cc8STakashi Sakamoto CIP_DBC_IS_END_EVENT = 0x04, 46dec63cc8STakashi Sakamoto CIP_WRONG_DBS = 0x08, 47dec63cc8STakashi Sakamoto CIP_SKIP_DBC_ZERO_CHECK = 0x10, 4862f00e40STakashi Sakamoto CIP_EMPTY_HAS_WRONG_DBC = 0x20, 4962f00e40STakashi Sakamoto CIP_JUMBO_PAYLOAD = 0x40, 502128f78fSTakashi Sakamoto CIP_HEADER_WITHOUT_EOH = 0x80, 513b196c39STakashi Sakamoto CIP_NO_HEADER = 0x100, 52588f2e2cSTakashi Sakamoto CIP_UNALIGHED_DBC = 0x200, 53*8070d265STakashi Sakamoto CIP_UNAWARE_SYT = 0x400, 54d67c46b9STakashi Sakamoto }; 55d67c46b9STakashi Sakamoto 56d67c46b9STakashi Sakamoto /** 57d67c46b9STakashi Sakamoto * enum cip_sfc - supported Sampling Frequency Codes (SFCs) 58d67c46b9STakashi Sakamoto * @CIP_SFC_32000: 32,000 data blocks 59d67c46b9STakashi Sakamoto * @CIP_SFC_44100: 44,100 data blocks 60d67c46b9STakashi Sakamoto * @CIP_SFC_48000: 48,000 data blocks 61d67c46b9STakashi Sakamoto * @CIP_SFC_88200: 88,200 data blocks 62d67c46b9STakashi Sakamoto * @CIP_SFC_96000: 96,000 data blocks 63d67c46b9STakashi Sakamoto * @CIP_SFC_176400: 176,400 data blocks 64d67c46b9STakashi Sakamoto * @CIP_SFC_192000: 192,000 data blocks 65d67c46b9STakashi Sakamoto * @CIP_SFC_COUNT: the number of supported SFCs 66d67c46b9STakashi Sakamoto * 67d67c46b9STakashi Sakamoto * These values are used to show nominal Sampling Frequency Code in 68d67c46b9STakashi Sakamoto * Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002, 69d67c46b9STakashi Sakamoto * this code means the number of events per second. Actually the code 70d67c46b9STakashi Sakamoto * represents the number of data blocks transferred per second in an AMDTP 71d67c46b9STakashi Sakamoto * stream. 72d67c46b9STakashi Sakamoto * 73d67c46b9STakashi Sakamoto * In IEC 61883-6:2005, some extensions were added to support more types of 74d67c46b9STakashi Sakamoto * data such as 'One Bit LInear Audio', therefore the meaning of SFC became 75d67c46b9STakashi Sakamoto * different depending on the types. 76d67c46b9STakashi Sakamoto * 77d67c46b9STakashi Sakamoto * Currently our implementation is compatible with IEC 61883-6:2002. 78d67c46b9STakashi Sakamoto */ 79d67c46b9STakashi Sakamoto enum cip_sfc { 80d67c46b9STakashi Sakamoto CIP_SFC_32000 = 0, 81d67c46b9STakashi Sakamoto CIP_SFC_44100 = 1, 82d67c46b9STakashi Sakamoto CIP_SFC_48000 = 2, 83d67c46b9STakashi Sakamoto CIP_SFC_88200 = 3, 84d67c46b9STakashi Sakamoto CIP_SFC_96000 = 4, 85d67c46b9STakashi Sakamoto CIP_SFC_176400 = 5, 86d67c46b9STakashi Sakamoto CIP_SFC_192000 = 6, 87d67c46b9STakashi Sakamoto CIP_SFC_COUNT 88d67c46b9STakashi Sakamoto }; 89d67c46b9STakashi Sakamoto 90d67c46b9STakashi Sakamoto struct fw_unit; 91d67c46b9STakashi Sakamoto struct fw_iso_context; 92d67c46b9STakashi Sakamoto struct snd_pcm_substream; 93d67c46b9STakashi Sakamoto struct snd_pcm_runtime; 94d67c46b9STakashi Sakamoto 95d67c46b9STakashi Sakamoto enum amdtp_stream_direction { 96d67c46b9STakashi Sakamoto AMDTP_OUT_STREAM = 0, 97d67c46b9STakashi Sakamoto AMDTP_IN_STREAM 98d67c46b9STakashi Sakamoto }; 99d67c46b9STakashi Sakamoto 10004130cf8STakashi Sakamoto struct pkt_desc { 10104130cf8STakashi Sakamoto u32 cycle; 10204130cf8STakashi Sakamoto u32 syt; 10304130cf8STakashi Sakamoto unsigned int data_blocks; 10404130cf8STakashi Sakamoto unsigned int data_block_counter; 10504130cf8STakashi Sakamoto __be32 *ctx_payload; 10604130cf8STakashi Sakamoto }; 10704130cf8STakashi Sakamoto 108df075feeSTakashi Sakamoto struct amdtp_stream; 1099a738ad1STakashi Sakamoto typedef unsigned int (*amdtp_stream_process_ctx_payloads_t)( 110df075feeSTakashi Sakamoto struct amdtp_stream *s, 111d2c104a3STakashi Sakamoto const struct pkt_desc *desc, 1129a738ad1STakashi Sakamoto unsigned int packets, 113d2c104a3STakashi Sakamoto struct snd_pcm_substream *pcm); 1142472cfb3STakashi Sakamoto 1152472cfb3STakashi Sakamoto struct amdtp_domain; 116d67c46b9STakashi Sakamoto struct amdtp_stream { 117d67c46b9STakashi Sakamoto struct fw_unit *unit; 118ffe66bbeSTakashi Sakamoto // The combination of cip_flags enumeration-constants. 119ffe66bbeSTakashi Sakamoto unsigned int flags; 120d67c46b9STakashi Sakamoto enum amdtp_stream_direction direction; 121d67c46b9STakashi Sakamoto struct mutex mutex; 122d67c46b9STakashi Sakamoto 123d67c46b9STakashi Sakamoto /* For packet processing. */ 124d67c46b9STakashi Sakamoto struct fw_iso_context *context; 125d67c46b9STakashi Sakamoto struct iso_packets_buffer buffer; 126a0e02331STakashi Sakamoto unsigned int queue_size; 127d67c46b9STakashi Sakamoto int packet_index; 12804130cf8STakashi Sakamoto struct pkt_desc *pkt_descs; 1293b196c39STakashi Sakamoto int tag; 130d3d10a4aSTakashi Sakamoto union { 131d3d10a4aSTakashi Sakamoto struct { 132d3d10a4aSTakashi Sakamoto unsigned int ctx_header_size; 133d3d10a4aSTakashi Sakamoto 134d3d10a4aSTakashi Sakamoto // limit for payload of iso packet. 135f11453c7STakashi Sakamoto unsigned int max_ctx_payload_length; 136d67c46b9STakashi Sakamoto 137d3d10a4aSTakashi Sakamoto // For quirks of CIP headers. 138d3d10a4aSTakashi Sakamoto // Fixed interval of dbc between previos/current 139d3d10a4aSTakashi Sakamoto // packets. 140d3d10a4aSTakashi Sakamoto unsigned int dbc_interval; 141d3d10a4aSTakashi Sakamoto } tx; 142d3d10a4aSTakashi Sakamoto struct { 143d3d10a4aSTakashi Sakamoto // To calculate CIP data blocks and tstamp. 144d3d10a4aSTakashi Sakamoto unsigned int transfer_delay; 1451a4be183STakashi Sakamoto unsigned int seq_index; 1461a4be183STakashi Sakamoto 147d3d10a4aSTakashi Sakamoto // To generate CIP header. 148d3d10a4aSTakashi Sakamoto unsigned int fdf; 14960dd4929STakashi Sakamoto 15060dd4929STakashi Sakamoto // To generate constant hardware IRQ. 151e229853dSTakashi Sakamoto unsigned int event_count; 15260dd4929STakashi Sakamoto } rx; 15360dd4929STakashi Sakamoto } ctx_data; 154d3d10a4aSTakashi Sakamoto 155d67c46b9STakashi Sakamoto /* For CIP headers. */ 156d67c46b9STakashi Sakamoto unsigned int source_node_id_field; 157d67c46b9STakashi Sakamoto unsigned int data_block_quadlets; 158d67c46b9STakashi Sakamoto unsigned int data_block_counter; 1599863874fSTakashi Sakamoto unsigned int sph; 160d67c46b9STakashi Sakamoto unsigned int fmt; 161d67c46b9STakashi Sakamoto 162d67c46b9STakashi Sakamoto /* Internal flags. */ 163d67c46b9STakashi Sakamoto enum cip_sfc sfc; 164d67c46b9STakashi Sakamoto unsigned int syt_interval; 165d67c46b9STakashi Sakamoto 166d67c46b9STakashi Sakamoto /* For a PCM substream processing. */ 167d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm; 1682b3d2987STakashi Iwai struct work_struct period_work; 1694a9bfafcSTakashi Sakamoto snd_pcm_uframes_t pcm_buffer_pointer; 170d67c46b9STakashi Sakamoto unsigned int pcm_period_pointer; 171d67c46b9STakashi Sakamoto 172bdaedca7STakashi Sakamoto // To start processing content of packets at the same cycle in several contexts for 173bdaedca7STakashi Sakamoto // each direction. 174bdaedca7STakashi Sakamoto bool callbacked:1; 175bdaedca7STakashi Sakamoto bool ready_processing:1; 176bdaedca7STakashi Sakamoto wait_queue_head_t ready_wait; 177705794c5STakashi Sakamoto unsigned int next_cycle; 178d67c46b9STakashi Sakamoto 179df075feeSTakashi Sakamoto /* For backends to process data blocks. */ 180df075feeSTakashi Sakamoto void *protocol; 1819a738ad1STakashi Sakamoto amdtp_stream_process_ctx_payloads_t process_ctx_payloads; 1826261f90bSTakashi Sakamoto 1836261f90bSTakashi Sakamoto // For domain. 184157a53eeSTakashi Sakamoto int channel; 185157a53eeSTakashi Sakamoto int speed; 1866261f90bSTakashi Sakamoto struct list_head list; 1872472cfb3STakashi Sakamoto struct amdtp_domain *domain; 188d67c46b9STakashi Sakamoto }; 189d67c46b9STakashi Sakamoto 190d67c46b9STakashi Sakamoto int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit, 191ffe66bbeSTakashi Sakamoto enum amdtp_stream_direction dir, unsigned int flags, 192df075feeSTakashi Sakamoto unsigned int fmt, 1939a738ad1STakashi Sakamoto amdtp_stream_process_ctx_payloads_t process_ctx_payloads, 194df075feeSTakashi Sakamoto unsigned int protocol_size); 195d67c46b9STakashi Sakamoto void amdtp_stream_destroy(struct amdtp_stream *s); 196d67c46b9STakashi Sakamoto 197df075feeSTakashi Sakamoto int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, 198df075feeSTakashi Sakamoto unsigned int data_block_quadlets); 199d67c46b9STakashi Sakamoto unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s); 200d67c46b9STakashi Sakamoto 201d67c46b9STakashi Sakamoto void amdtp_stream_update(struct amdtp_stream *s); 202d67c46b9STakashi Sakamoto 203d67c46b9STakashi Sakamoto int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, 204d67c46b9STakashi Sakamoto struct snd_pcm_runtime *runtime); 205df075feeSTakashi Sakamoto 206d67c46b9STakashi Sakamoto void amdtp_stream_pcm_prepare(struct amdtp_stream *s); 207d67c46b9STakashi Sakamoto void amdtp_stream_pcm_abort(struct amdtp_stream *s); 208d67c46b9STakashi Sakamoto 209d67c46b9STakashi Sakamoto extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT]; 210d67c46b9STakashi Sakamoto extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT]; 211d67c46b9STakashi Sakamoto 212d67c46b9STakashi Sakamoto /** 213d67c46b9STakashi Sakamoto * amdtp_stream_running - check stream is running or not 214d67c46b9STakashi Sakamoto * @s: the AMDTP stream 215d67c46b9STakashi Sakamoto * 216d67c46b9STakashi Sakamoto * If this function returns true, the stream is running. 217d67c46b9STakashi Sakamoto */ 218d67c46b9STakashi Sakamoto static inline bool amdtp_stream_running(struct amdtp_stream *s) 219d67c46b9STakashi Sakamoto { 220d67c46b9STakashi Sakamoto return !IS_ERR(s->context); 221d67c46b9STakashi Sakamoto } 222d67c46b9STakashi Sakamoto 223d67c46b9STakashi Sakamoto /** 224d67c46b9STakashi Sakamoto * amdtp_streaming_error - check for streaming error 225d67c46b9STakashi Sakamoto * @s: the AMDTP stream 226d67c46b9STakashi Sakamoto * 227d67c46b9STakashi Sakamoto * If this function returns true, the stream's packet queue has stopped due to 228d67c46b9STakashi Sakamoto * an asynchronous error. 229d67c46b9STakashi Sakamoto */ 230d67c46b9STakashi Sakamoto static inline bool amdtp_streaming_error(struct amdtp_stream *s) 231d67c46b9STakashi Sakamoto { 232d67c46b9STakashi Sakamoto return s->packet_index < 0; 233d67c46b9STakashi Sakamoto } 234d67c46b9STakashi Sakamoto 235d67c46b9STakashi Sakamoto /** 236d67c46b9STakashi Sakamoto * amdtp_stream_pcm_running - check PCM substream is running or not 237d67c46b9STakashi Sakamoto * @s: the AMDTP stream 238d67c46b9STakashi Sakamoto * 239d67c46b9STakashi Sakamoto * If this function returns true, PCM substream in the AMDTP stream is running. 240d67c46b9STakashi Sakamoto */ 241d67c46b9STakashi Sakamoto static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s) 242d67c46b9STakashi Sakamoto { 243d67c46b9STakashi Sakamoto return !!s->pcm; 244d67c46b9STakashi Sakamoto } 245d67c46b9STakashi Sakamoto 246d67c46b9STakashi Sakamoto /** 247d67c46b9STakashi Sakamoto * amdtp_stream_pcm_trigger - start/stop playback from a PCM device 248d67c46b9STakashi Sakamoto * @s: the AMDTP stream 249d67c46b9STakashi Sakamoto * @pcm: the PCM device to be started, or %NULL to stop the current device 250d67c46b9STakashi Sakamoto * 251d67c46b9STakashi Sakamoto * Call this function on a running isochronous stream to enable the actual 252d67c46b9STakashi Sakamoto * transmission of PCM data. This function should be called from the PCM 253d67c46b9STakashi Sakamoto * device's .trigger callback. 254d67c46b9STakashi Sakamoto */ 255d67c46b9STakashi Sakamoto static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s, 256d67c46b9STakashi Sakamoto struct snd_pcm_substream *pcm) 257d67c46b9STakashi Sakamoto { 2586aa7de05SMark Rutland WRITE_ONCE(s->pcm, pcm); 259d67c46b9STakashi Sakamoto } 260d67c46b9STakashi Sakamoto 261d67c46b9STakashi Sakamoto static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) 262d67c46b9STakashi Sakamoto { 263d67c46b9STakashi Sakamoto return sfc & 1; 264d67c46b9STakashi Sakamoto } 265d67c46b9STakashi Sakamoto 26625babf29STakashi Sakamoto struct seq_desc { 26725babf29STakashi Sakamoto unsigned int syt_offset; 26825babf29STakashi Sakamoto unsigned int data_blocks; 26925babf29STakashi Sakamoto }; 27025babf29STakashi Sakamoto 2713ec3d7a3STakashi Sakamoto struct amdtp_domain { 2723ec3d7a3STakashi Sakamoto struct list_head streams; 273d68c3123STakashi Sakamoto 274d68c3123STakashi Sakamoto unsigned int events_per_period; 275a0e02331STakashi Sakamoto unsigned int events_per_buffer; 27603b4816dSTakashi Sakamoto 27703b4816dSTakashi Sakamoto struct amdtp_stream *irq_target; 27825babf29STakashi Sakamoto 279d32872f3STakashi Sakamoto struct { 28026541cb1STakashi Sakamoto unsigned int tx_init_skip; 281da3623abSTakashi Sakamoto unsigned int tx_start; 2829b1fcd9bSTakashi Sakamoto unsigned int rx_start; 283da3623abSTakashi Sakamoto } processing_cycle; 284da3623abSTakashi Sakamoto 285da3623abSTakashi Sakamoto struct { 286d32872f3STakashi Sakamoto struct seq_desc *descs; 287d32872f3STakashi Sakamoto unsigned int size; 288d32872f3STakashi Sakamoto unsigned int tail; 289d32872f3STakashi Sakamoto } seq; 2901a4be183STakashi Sakamoto 2911a4be183STakashi Sakamoto unsigned int data_block_state; 2921a4be183STakashi Sakamoto unsigned int syt_offset_state; 2931a4be183STakashi Sakamoto unsigned int last_syt_offset; 2943ec3d7a3STakashi Sakamoto }; 2953ec3d7a3STakashi Sakamoto 2963ec3d7a3STakashi Sakamoto int amdtp_domain_init(struct amdtp_domain *d); 2973ec3d7a3STakashi Sakamoto void amdtp_domain_destroy(struct amdtp_domain *d); 2983ec3d7a3STakashi Sakamoto 299157a53eeSTakashi Sakamoto int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s, 300157a53eeSTakashi Sakamoto int channel, int speed); 301157a53eeSTakashi Sakamoto 30226541cb1STakashi Sakamoto int amdtp_domain_start(struct amdtp_domain *d, unsigned int tx_init_skip_cycles); 3036261f90bSTakashi Sakamoto void amdtp_domain_stop(struct amdtp_domain *d); 3046261f90bSTakashi Sakamoto 305d68c3123STakashi Sakamoto static inline int amdtp_domain_set_events_per_period(struct amdtp_domain *d, 306a0e02331STakashi Sakamoto unsigned int events_per_period, 307a0e02331STakashi Sakamoto unsigned int events_per_buffer) 308d68c3123STakashi Sakamoto { 309d68c3123STakashi Sakamoto d->events_per_period = events_per_period; 310a0e02331STakashi Sakamoto d->events_per_buffer = events_per_buffer; 311d68c3123STakashi Sakamoto 312d68c3123STakashi Sakamoto return 0; 313d68c3123STakashi Sakamoto } 314d68c3123STakashi Sakamoto 315f890f9a0STakashi Sakamoto unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d, 316f890f9a0STakashi Sakamoto struct amdtp_stream *s); 317e6dcc92fSTakashi Sakamoto int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s); 318e6dcc92fSTakashi Sakamoto 319bdaedca7STakashi Sakamoto /** 320bdaedca7STakashi Sakamoto * amdtp_domain_wait_ready - sleep till being ready to process packets or timeout 321bdaedca7STakashi Sakamoto * @d: the AMDTP domain 322bdaedca7STakashi Sakamoto * @timeout_ms: msec till timeout 323bdaedca7STakashi Sakamoto * 324bdaedca7STakashi Sakamoto * If this function return false, the AMDTP domain should be stopped. 325bdaedca7STakashi Sakamoto */ 326bdaedca7STakashi Sakamoto static inline bool amdtp_domain_wait_ready(struct amdtp_domain *d, unsigned int timeout_ms) 327bdaedca7STakashi Sakamoto { 328bdaedca7STakashi Sakamoto struct amdtp_stream *s; 329bdaedca7STakashi Sakamoto 330bdaedca7STakashi Sakamoto list_for_each_entry(s, &d->streams, list) { 331bdaedca7STakashi Sakamoto unsigned int j = msecs_to_jiffies(timeout_ms); 332bdaedca7STakashi Sakamoto 333bdaedca7STakashi Sakamoto if (wait_event_interruptible_timeout(s->ready_wait, s->ready_processing, j) <= 0) 334bdaedca7STakashi Sakamoto return false; 335bdaedca7STakashi Sakamoto } 336bdaedca7STakashi Sakamoto 337bdaedca7STakashi Sakamoto return true; 338bdaedca7STakashi Sakamoto } 339bdaedca7STakashi Sakamoto 340d67c46b9STakashi Sakamoto #endif 341