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path: root/drivers/media/pci/cx18/cx18-audio.c
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Diffstat (limited to 'drivers/media/pci/cx18/cx18-audio.c')
-rw-r--r--drivers/media/pci/cx18/cx18-audio.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-audio.c b/drivers/media/pci/cx18/cx18-audio.c
new file mode 100644
index 00000000000..35268923911
--- /dev/null
+++ b/drivers/media/pci/cx18/cx18-audio.c
@@ -0,0 +1,92 @@
+/*
+ * cx18 audio-related functions
+ *
+ * Derived from ivtv-audio.c
+ *
+ * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA
+ */
+
+#include "cx18-driver.h"
+#include "cx18-io.h"
+#include "cx18-cards.h"
+#include "cx18-audio.h"
+
+#define CX18_AUDIO_ENABLE 0xc72014
+#define CX18_AI1_MUX_MASK 0x30
+#define CX18_AI1_MUX_I2S1 0x00
+#define CX18_AI1_MUX_I2S2 0x10
+#define CX18_AI1_MUX_843_I2S 0x20
+
+/* Selects the audio input and output according to the current
+ settings. */
+int cx18_audio_set_io(struct cx18 *cx)
+{
+ const struct cx18_card_audio_input *in;
+ u32 u, v;
+ int err;
+
+ /* Determine which input to use */
+ if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
+ in = &cx->card->radio_input;
+ else
+ in = &cx->card->audio_inputs[cx->audio_input];
+
+ /* handle muxer chips */
+ v4l2_subdev_call(cx->sd_extmux, audio, s_routing,
+ (u32) in->muxer_input, 0, 0);
+
+ err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl,
+ audio, s_routing, in->audio_input, 0, 0);
+ if (err)
+ return err;
+
+ /* FIXME - this internal mux should be abstracted to a subdev */
+ u = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
+ v = u & ~CX18_AI1_MUX_MASK;
+ switch (in->audio_input) {
+ case CX18_AV_AUDIO_SERIAL1:
+ v |= CX18_AI1_MUX_I2S1;
+ break;
+ case CX18_AV_AUDIO_SERIAL2:
+ v |= CX18_AI1_MUX_I2S2;
+ break;
+ default:
+ v |= CX18_AI1_MUX_843_I2S;
+ break;
+ }
+ if (v == u) {
+ /* force a toggle of some AI1 MUX control bits */
+ u &= ~CX18_AI1_MUX_MASK;
+ switch (in->audio_input) {
+ case CX18_AV_AUDIO_SERIAL1:
+ u |= CX18_AI1_MUX_843_I2S;
+ break;
+ case CX18_AV_AUDIO_SERIAL2:
+ u |= CX18_AI1_MUX_843_I2S;
+ break;
+ default:
+ u |= CX18_AI1_MUX_I2S1;
+ break;
+ }
+ cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE,
+ u, CX18_AI1_MUX_MASK);
+ }
+ cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE,
+ v, CX18_AI1_MUX_MASK);
+ return 0;
+}