[PATCH] v4l: (946) adds support for cx25840 video decoder

Adds support for cx25840 video decoder.

Driver authors: Hans Verkuil, Chris Kennedy, Tyler Trafford, Ulf Eklund.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Chris Kennedy <c@groovy.org>
Signed-off-by: Tyler Trafford <tatrafford@comcast.net>
Thanks-to: Ulf Eklund <ivtv@eklund.to>.
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 369 insertions, 0 deletions

diff --git a/drivers/media/video/cx25840/cx25840-audio.c b/drivers/media/video/cx25840/cx25840-audio.c
new file mode 100644
index 000000000000..3905580b1946
--- /dev/null
+++ b/drivers/media/video/cx25840/cx25840-audio.c
@@ -0,0 +1,369 @@
+/* cx25840 audio functions
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+#include <linux/videodev2.h>
+#include <linux/i2c.h>
+#include <media/audiochip.h>
+#include <media/i2c-compat.h>
+#include <media/v4l2-common.h>
+
+#include "cx25840.h"
+
+inline static int set_audclk_freq(struct i2c_client *client,
+				 enum v4l2_audio_clock_freq freq)
+{
+	struct cx25840_state *state = i2c_get_clientdata(client);
+
+	/* assert soft reset */
+	cx25840_and_or(client, 0x810, ~0x1, 0x01);
+
+	/* common for all inputs and rates */
+	/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
+	cx25840_write(client, 0x127, 0x50);
+
+	switch (state->audio_input) {
+	case AUDIO_TUNER:
+		switch (freq) {
+		case V4L2_AUDCLK_32_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040610);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xee39bb01);
+
+			/* src3/4/6_ctl = 0x0801f77f */
+			cx25840_write4(client, 0x900, 0x7ff70108);
+			cx25840_write4(client, 0x904, 0x7ff70108);
+			cx25840_write4(client, 0x90c, 0x7ff70108);
+			break;
+
+		case V4L2_AUDCLK_441_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040910);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xd66bec00);
+
+			/* src3/4/6_ctl = 0x08016d59 */
+			cx25840_write4(client, 0x900, 0x596d0108);
+			cx25840_write4(client, 0x904, 0x596d0108);
+			cx25840_write4(client, 0x90c, 0x596d0108);
+			break;
+
+		case V4L2_AUDCLK_48_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040a10);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xe5d69800);
+
+			/* src3/4/6_ctl = 0x08014faa */
+			cx25840_write4(client, 0x900, 0xaa4f0108);
+			cx25840_write4(client, 0x904, 0xaa4f0108);
+			cx25840_write4(client, 0x90c, 0xaa4f0108);
+			break;
+		}
+		break;
+
+	case AUDIO_EXTERN_1:
+	case AUDIO_EXTERN_2:
+	case AUDIO_INTERN:
+	case AUDIO_RADIO:
+		switch (freq) {
+		case V4L2_AUDCLK_32_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f04081e);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0x69082a01);
+
+			/* src1_ctl = 0x08010000 */
+			cx25840_write4(client, 0x8f8, 0x00000108);
+
+			/* src3/4/6_ctl = 0x08020000 */
+			cx25840_write4(client, 0x900, 0x00000208);
+			cx25840_write4(client, 0x904, 0x00000208);
+			cx25840_write4(client, 0x90c, 0x00000208);
+
+			/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
+			cx25840_write(client, 0x127, 0x54);
+			break;
+
+		case V4L2_AUDCLK_441_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040918);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xd66bec00);
+
+			/* src1_ctl = 0x08010000 */
+			cx25840_write4(client, 0x8f8, 0xcd600108);
+
+			/* src3/4/6_ctl = 0x08020000 */
+			cx25840_write4(client, 0x900, 0x85730108);
+			cx25840_write4(client, 0x904, 0x85730108);
+			cx25840_write4(client, 0x90c, 0x85730108);
+			break;
+
+		case V4L2_AUDCLK_48_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040a18);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xe5d69800);
+
+			/* src1_ctl = 0x08010000 */
+			cx25840_write4(client, 0x8f8, 0x00800108);
+
+			/* src3/4/6_ctl = 0x08020000 */
+			cx25840_write4(client, 0x900, 0x55550108);
+			cx25840_write4(client, 0x904, 0x55550108);
+			cx25840_write4(client, 0x90c, 0x55550108);
+			break;
+		}
+		break;
+	}
+
+	/* deassert soft reset */
+	cx25840_and_or(client, 0x810, ~0x1, 0x00);
+
+	state->audclk_freq = freq;
+
+	return 0;
+}
+
+static int set_input(struct i2c_client *client, int audio_input)
+{
+	struct cx25840_state *state = i2c_get_clientdata(client);
+
+	cx25840_dbg("set audio input (%d)\n", audio_input);
+
+	/* stop microcontroller */
+	cx25840_and_or(client, 0x803, ~0x10, 0);
+
+	/* Mute everything to prevent the PFFT! */
+	cx25840_write(client, 0x8d3, 0x1f);
+
+	switch (audio_input) {
+	case AUDIO_TUNER:
+		/* Set Path1 to Analog Demod Main Channel */
+		cx25840_write4(client, 0x8d0, 0x7038061f);
+
+		/* When the microcontroller detects the
+		 * audio format, it will unmute the lines */
+		cx25840_and_or(client, 0x803, ~0x10, 0x10);
+		break;
+
+	case AUDIO_EXTERN_1:
+	case AUDIO_EXTERN_2:
+	case AUDIO_INTERN:
+	case AUDIO_RADIO:
+		/* Set Path1 to Serial Audio Input */
+		cx25840_write4(client, 0x8d0, 0x12100101);
+
+		/* The microcontroller should not be started for the
+		 * non-tuner inputs: autodetection is specific for
+		 * TV audio. */
+		break;
+
+	default:
+		cx25840_dbg("Invalid audio input selection %d\n", audio_input);
+		return -EINVAL;
+	}
+
+	state->audio_input = audio_input;
+
+	return set_audclk_freq(client, state->audclk_freq);
+}
+
+inline static int get_volume(struct i2c_client *client)
+{
+	/* Volume runs +18dB to -96dB in 1/2dB steps
+	 * change to fit the msp3400 -114dB to +12dB range */
+
+	/* check PATH1_VOLUME */
+	int vol = 228 - cx25840_read(client, 0x8d4);
+	vol = (vol / 2) + 23;
+	return vol << 9;
+}
+
+inline static void set_volume(struct i2c_client *client, int volume)
+{
+	/* First convert the volume to msp3400 values (0-127) */
+	int vol = volume >> 9;
+	/* now scale it up to cx25840 values
+	 * -114dB to -96dB maps to 0
+	 * this should be 19, but in my testing that was 4dB too loud */
+	if (vol <= 23) {
+		vol = 0;
+	} else {
+		vol -= 23;
+	}
+
+	/* PATH1_VOLUME */
+	cx25840_write(client, 0x8d4, 228 - (vol * 2));
+}
+
+inline static int get_bass(struct i2c_client *client)
+{
+	/* bass is 49 steps +12dB to -12dB */
+
+	/* check PATH1_EQ_BASS_VOL */
+	int bass = cx25840_read(client, 0x8d9) & 0x3f;
+	bass = (((48 - bass) * 0xffff) + 47) / 48;
+	return bass;
+}
+
+inline static void set_bass(struct i2c_client *client, int bass)
+{
+	/* PATH1_EQ_BASS_VOL */
+	cx25840_and_or(client, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
+}
+
+inline static int get_treble(struct i2c_client *client)
+{
+	/* treble is 49 steps +12dB to -12dB */
+
+	/* check PATH1_EQ_TREBLE_VOL */
+	int treble = cx25840_read(client, 0x8db) & 0x3f;
+	treble = (((48 - treble) * 0xffff) + 47) / 48;
+	return treble;
+}
+
+inline static void set_treble(struct i2c_client *client, int treble)
+{
+	/* PATH1_EQ_TREBLE_VOL */
+	cx25840_and_or(client, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
+}
+
+inline static int get_balance(struct i2c_client *client)
+{
+	/* balance is 7 bit, 0 to -96dB */
+
+	/* check PATH1_BAL_LEVEL */
+	int balance = cx25840_read(client, 0x8d5) & 0x7f;
+	/* check PATH1_BAL_LEFT */
+	if ((cx25840_read(client, 0x8d5) & 0x80) == 0)
+		balance = 0x80 - balance;
+	else
+		balance = 0x80 + balance;
+	return balance << 8;
+}
+
+inline static void set_balance(struct i2c_client *client, int balance)
+{
+	int bal = balance >> 8;
+	if (bal > 0x80) {
+		/* PATH1_BAL_LEFT */
+		cx25840_and_or(client, 0x8d5, 0x7f, 0x80);
+		/* PATH1_BAL_LEVEL */
+		cx25840_and_or(client, 0x8d5, ~0x7f, bal & 0x7f);
+	} else {
+		/* PATH1_BAL_LEFT */
+		cx25840_and_or(client, 0x8d5, 0x7f, 0x00);
+		/* PATH1_BAL_LEVEL */
+		cx25840_and_or(client, 0x8d5, ~0x7f, 0x80 - bal);
+	}
+}
+
+inline static int get_mute(struct i2c_client *client)
+{
+	/* check SRC1_MUTE_EN */
+	return cx25840_read(client, 0x8d3) & 0x2 ? 1 : 0;
+}
+
+inline static void set_mute(struct i2c_client *client, int mute)
+{
+	struct cx25840_state *state = i2c_get_clientdata(client);
+
+	if (state->audio_input == AUDIO_TUNER) {
+		/* Must turn off microcontroller in order to mute sound.
+		 * Not sure if this is the best method, but it does work.
+		 * If the microcontroller is running, then it will undo any
+		 * changes to the mute register. */
+		if (mute) {
+			/* disable microcontroller */
+			cx25840_and_or(client, 0x803, ~0x10, 0x00);
+			cx25840_write(client, 0x8d3, 0x1f);
+		} else {
+			/* enable microcontroller */
+			cx25840_and_or(client, 0x803, ~0x10, 0x10);
+		}
+	} else {
+		/* SRC1_MUTE_EN */
+		cx25840_and_or(client, 0x8d3, ~0x2, mute ? 0x02 : 0x00);
+	}
+}
+
+int cx25840_audio(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+	struct v4l2_control *ctrl = arg;
+
+	switch (cmd) {
+	case AUDC_SET_INPUT:
+		return set_input(client, *(int *)arg);
+	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
+		return set_audclk_freq(client, *(enum v4l2_audio_clock_freq *)arg);
+	case VIDIOC_G_CTRL:
+		switch (ctrl->id) {
+		case V4L2_CID_AUDIO_VOLUME:
+			ctrl->value = get_volume(client);
+			break;
+		case V4L2_CID_AUDIO_BASS:
+			ctrl->value = get_bass(client);
+			break;
+		case V4L2_CID_AUDIO_TREBLE:
+			ctrl->value = get_treble(client);
+			break;
+		case V4L2_CID_AUDIO_BALANCE:
+			ctrl->value = get_balance(client);
+			break;
+		case V4L2_CID_AUDIO_MUTE:
+			ctrl->value = get_mute(client);
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case VIDIOC_S_CTRL:
+		switch (ctrl->id) {
+		case V4L2_CID_AUDIO_VOLUME:
+			set_volume(client, ctrl->value);
+			break;
+		case V4L2_CID_AUDIO_BASS:
+			set_bass(client, ctrl->value);
+			break;
+		case V4L2_CID_AUDIO_TREBLE:
+			set_treble(client, ctrl->value);
+			break;
+		case V4L2_CID_AUDIO_BALANCE:
+			set_balance(client, ctrl->value);
+			break;
+		case V4L2_CID_AUDIO_MUTE:
+			set_mute(client, ctrl->value);
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}