27 menuconfig SND_DRIVERS
28 bool "Generic sound devices"
31 Support for generic sound devices.
36 tristate "PC-Speaker support (READ HELP!)"
37 depends on PCSPKR_PLATFORM && X86 && HIGH_RES_TIMERS
41 If you don't have a sound card in your computer, you can include a
42 driver for the PC speaker which allows it to act like a primitive
44 This driver also replaces the pcspkr driver for beeps.
46 You can compile this as a module which will be called snd-pcsp.
48 WARNING: if you already have a soundcard, enabling this
49 driver may lead to a problem. Namely, it may get loaded
50 before the other sound driver of yours, making the
51 pc-speaker a default sound device. Which is likely not
52 what you want. To make this driver play nicely with other
53 sound driver, you can add this in a configuration file under
54 /etc/modprobe.d/ directory:
55 options snd-pcsp index=2
57 You don't need this driver if you only want your pc-speaker to beep.
58 You don't need this driver if you have a tablet piezo beeper
59 in your PC instead of the real speaker.
61 Say N if you have a sound card.
63 Say Y only if you really know what you do.
66 tristate "Dummy (/dev/null) soundcard"
69 Say Y here to include the dummy driver. This driver does
70 nothing, but emulates various mixer controls and PCM devices.
72 You don't need this unless you're testing the hardware support
73 of programs using the ALSA API.
75 To compile this driver as a module, choose M here: the module
76 will be called snd-dummy.
79 tristate "Generic loopback driver (PCM)"
82 Say 'Y' or 'M' to include support for the PCM loopback device.
83 This module returns played samples back to the user space using
84 the standard ALSA PCM device. The devices are routed 0->1 and
85 1->0, where first number is the playback PCM device and second
86 number is the capture device. Module creates two PCM devices and
87 configured number of substreams (see the pcm_substreams module
90 The loopback device allows time sychronization with an external
91 timing source using the time shift universal control (+-20%
94 To compile this driver as a module, choose M here: the module
95 will be called snd-aloop.
98 tristate "Virtual MIDI soundcard"
99 depends on SND_SEQUENCER
103 Say Y here to include the virtual MIDI driver. This driver
104 allows to connect applications using raw MIDI devices to
107 If you don't know what MIDI is, say N here.
109 To compile this driver as a module, choose M here: the module
110 will be called snd-virmidi.
113 tristate "MOTU MidiTimePiece AV multiport MIDI"
116 To use a MOTU MidiTimePiece AV multiport MIDI adapter
117 connected to the parallel port, say Y here and make sure that
118 the standard parallel port driver isn't used for the port.
120 To compile this driver as a module, choose M here: the module
121 will be called snd-mtpav.
124 tristate "ESI Miditerminal 4140 driver"
128 The ESI Miditerminal 4140 is a 4 In 4 Out MIDI Interface with
129 additional SMPTE Timecode capabilities for the parallel port.
131 Say 'Y' to include support for this device.
133 To compile this driver as a module, chose 'M' here: the module
134 will be called snd-mts64.
136 config SND_SERIAL_U16550
137 tristate "UART16550 serial MIDI driver"
140 To include support for MIDI serial port interfaces, say Y here
141 and read <file:Documentation/sound/alsa/serial-u16550.txt>.
142 This driver works with serial UARTs 16550 and better.
144 This driver accesses the serial port hardware directly, so
145 make sure that the standard serial driver isn't used or
146 deactivated with setserial before loading this driver.
148 To compile this driver as a module, choose M here: the module
149 will be called snd-serial-u16550.
152 tristate "Generic MPU-401 UART driver"
153 select SND_MPU401_UART
155 Say Y here to include support for MIDI ports compatible with
156 the Roland MPU-401 interface in UART mode.
158 To compile this driver as a module, choose M here: the module
159 will be called snd-mpu401.
161 config SND_PORTMAN2X4
162 tristate "Portman 2x4 driver"
166 Say Y here to include support for Midiman Portman 2x4 parallel
169 To compile this driver as a module, choose M here: the module
170 will be called snd-portman2x4.
172 config SND_ML403_AC97CR
173 tristate "Xilinx ML403 AC97 Controller Reference"
174 depends on XILINX_VIRTEX
175 select SND_AC97_CODEC
177 Say Y here to include support for the
178 opb_ac97_controller_ref_v1_00_a ip core found in Xilinx's ML403
181 To compile this driver as a module, choose M here: the module
182 will be called snd-ml403_ac97cr.
184 config SND_AC97_POWER_SAVE
185 bool "AC97 Power-Saving Mode"
186 depends on SND_AC97_CODEC
189 Say Y here to enable the aggressive power-saving support of
190 AC97 codecs. In this mode, the power-mode is dynamically
191 controlled at each open/close.
193 The mode is activated by passing 'power_save=X' to the
194 snd-ac97-codec driver module, where 'X' is the time-out
195 value, a nonnegative integer that specifies how many
196 seconds of idle time the driver must count before it may
197 put the AC97 into power-save mode; a value of 0 (zero)
198 disables the use of this power-save mode.
200 After the snd-ac97-codec driver module has been loaded,
201 the 'power_save' parameter can be set via sysfs as follows:
203 echo 10 > /sys/module/snd_ac97_codec/parameters/power_save
205 In this case, the time-out is set to 10 seconds; setting
206 the time-out to 1 second (the minimum activation value)
207 isn't recommended because many applications try to reopen
208 the device frequently. A value of 10 seconds would be a
209 good choice for normal operations.
211 See Documentation/sound/alsa/powersave.txt for more details.
213 config SND_AC97_POWER_SAVE_DEFAULT
214 int "Default time-out for AC97 power-save mode"
215 depends on SND_AC97_POWER_SAVE
218 The default time-out value in seconds for AC97 automatic
219 power-save mode. 0 means to disable the power-save mode.
221 See SND_AC97_POWER_SAVE for more details.