[media] sony-btf-mpx: the MPX driver for the sony BTF PAL/SECAM tuner

The Sony BTF PG472Z has an internal MPX to deal with mono/stereo/bilingual
audio. This is split off from the wis-sony-tuner driver that is part of
the go7007 driver as it should be a separate i2c sub-device driver.
The wis-sony-tuner is really three i2c devices: a standard tuner, a tda9887
compatible demodulator and this mpx. After this patch the wis-sony-tuner
can be replaced by this driver and the standard tuner driver.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/i2c/Kconfig

@@ -133,7 +133,7 @@ config VIDEO_WM8739
 	  module will be called wm8739.
 
 config VIDEO_VP27SMPX
-	tristate "Panasonic VP27s internal MPX"
+	tristate "Panasonic VP27's internal MPX"
 	depends on VIDEO_V4L2 && I2C
 	---help---
 	  Support for the internal MPX of the Panasonic VP27s tuner.
@@ -141,6 +141,15 @@ config VIDEO_VP27SMPX
 	  To compile this driver as a module, choose M here: the
 	  module will be called vp27smpx.
 
+config VIDEO_SONY_BTF_MPX
+	tristate "Sony BTF's internal MPX"
+	depends on VIDEO_V4L2 && I2C
+	help
+	  Support for the internal MPX of the Sony BTF-PG472Z tuner.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called sony-btf-mpx.
+
 comment "RDS decoders"
 
 config VIDEO_SAA6588

drivers/media/i2c/Makefile

@@ -44,6 +44,7 @@ obj-$(CONFIG_VIDEO_TLV320AIC23B) += tlv320aic23b.o
 obj-$(CONFIG_VIDEO_WM8775) += wm8775.o
 obj-$(CONFIG_VIDEO_WM8739) += wm8739.o
 obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
+obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
 obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
 obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
 obj-$(CONFIG_VIDEO_OV7670) 	+= ov7670.o

drivers/media/i2c/sony-btf-mpx.c

@@ -0,0 +1,399 @@
+/*
+ * Copyright (C) 2005-2006 Micronas USA Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * 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 <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <media/tuner.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-device.h>
+#include <linux/slab.h>
+
+MODULE_DESCRIPTION("sony-btf-mpx driver");
+MODULE_LICENSE("GPL v2");
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "debug level 0=off(default) 1=on\n");
+
+/* #define MPX_DEBUG */
+
+/*
+ * Note:
+ *
+ * AS(IF/MPX) pin:      LOW      HIGH/OPEN
+ * IF/MPX address:   0x42/0x40   0x43/0x44
+ */
+
+
+static int force_mpx_mode = -1;
+module_param(force_mpx_mode, int, 0644);
+
+struct sony_btf_mpx {
+	struct v4l2_subdev sd;
+	int mpxmode;
+	u32 audmode;
+};
+
+static inline struct sony_btf_mpx *to_state(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct sony_btf_mpx, sd);
+}
+
+static int mpx_write(struct i2c_client *client, int dev, int addr, int val)
+{
+	u8 buffer[5];
+	struct i2c_msg msg;
+
+	buffer[0] = dev;
+	buffer[1] = addr >> 8;
+	buffer[2] = addr & 0xff;
+	buffer[3] = val >> 8;
+	buffer[4] = val & 0xff;
+	msg.addr = client->addr;
+	msg.flags = 0;
+	msg.len = 5;
+	msg.buf = buffer;
+	i2c_transfer(client->adapter, &msg, 1);
+	return 0;
+}
+
+/*
+ * MPX register values for the BTF-PG472Z:
+ *
+ *                                 FM_     NICAM_  SCART_
+ *          MODUS  SOURCE    ACB   PRESCAL PRESCAL PRESCAL SYSTEM  VOLUME
+ *         10/0030 12/0008 12/0013 12/000E 12/0010 12/0000 10/0020 12/0000
+ *         ---------------------------------------------------------------
+ * Auto     1003    0020    0100    2603    5000    XXXX    0001    7500
+ *
+ * B/G
+ *  Mono    1003    0020    0100    2603    5000    XXXX    0003    7500
+ *  A2      1003    0020    0100    2601    5000    XXXX    0003    7500
+ *  NICAM   1003    0120    0100    2603    5000    XXXX    0008    7500
+ *
+ * I
+ *  Mono    1003    0020    0100    2603    7900    XXXX    000A    7500
+ *  NICAM   1003    0120    0100    2603    7900    XXXX    000A    7500
+ *
+ * D/K
+ *  Mono    1003    0020    0100    2603    5000    XXXX    0004    7500
+ *  A2-1    1003    0020    0100    2601    5000    XXXX    0004    7500
+ *  A2-2    1003    0020    0100    2601    5000    XXXX    0005    7500
+ *  A2-3    1003    0020    0100    2601    5000    XXXX    0007    7500
+ *  NICAM   1003    0120    0100    2603    5000    XXXX    000B    7500
+ *
+ * L/L'
+ *  Mono    0003    0200    0100    7C03    5000    2200    0009    7500
+ *  NICAM   0003    0120    0100    7C03    5000    XXXX    0009    7500
+ *
+ * M
+ *  Mono    1003    0200    0100    2B03    5000    2B00    0002    7500
+ *
+ * For Asia, replace the 0x26XX in FM_PRESCALE with 0x14XX.
+ *
+ * Bilingual selection in A2/NICAM:
+ *
+ *         High byte of SOURCE     Left chan   Right chan
+ *                 0x01              MAIN         SUB
+ *                 0x03              MAIN         MAIN
+ *                 0x04              SUB          SUB
+ *
+ * Force mono in NICAM by setting the high byte of SOURCE to 0x02 (L/L') or
+ * 0x00 (all other bands).  Force mono in A2 with FMONO_A2:
+ *
+ *                      FMONO_A2
+ *                      10/0022
+ *                      --------
+ *     Forced mono ON     07F0
+ *     Forced mono OFF    0190
+ */
+
+static const struct {
+	enum { AUD_MONO, AUD_A2, AUD_NICAM, AUD_NICAM_L } audio_mode;
+	u16 modus;
+	u16 source;
+	u16 acb;
+	u16 fm_prescale;
+	u16 nicam_prescale;
+	u16 scart_prescale;
+	u16 system;
+	u16 volume;
+} mpx_audio_modes[] = {
+	/* Auto */	{ AUD_MONO,	0x1003, 0x0020, 0x0100, 0x2603,
+					0x5000, 0x0000, 0x0001, 0x7500 },
+	/* B/G Mono */	{ AUD_MONO,	0x1003, 0x0020, 0x0100, 0x2603,
+					0x5000, 0x0000, 0x0003, 0x7500 },
+	/* B/G A2 */	{ AUD_A2,	0x1003, 0x0020, 0x0100, 0x2601,
+					0x5000, 0x0000, 0x0003, 0x7500 },
+	/* B/G NICAM */ { AUD_NICAM,	0x1003, 0x0120, 0x0100, 0x2603,
+					0x5000, 0x0000, 0x0008, 0x7500 },
+	/* I Mono */	{ AUD_MONO,	0x1003, 0x0020, 0x0100, 0x2603,
+					0x7900, 0x0000, 0x000A, 0x7500 },
+	/* I NICAM */	{ AUD_NICAM,	0x1003, 0x0120, 0x0100, 0x2603,
+					0x7900, 0x0000, 0x000A, 0x7500 },
+	/* D/K Mono */	{ AUD_MONO,	0x1003, 0x0020, 0x0100, 0x2603,
+					0x5000, 0x0000, 0x0004, 0x7500 },
+	/* D/K A2-1 */	{ AUD_A2,	0x1003, 0x0020, 0x0100, 0x2601,
+					0x5000, 0x0000, 0x0004, 0x7500 },
+	/* D/K A2-2 */	{ AUD_A2,	0x1003, 0x0020, 0x0100, 0x2601,
+					0x5000, 0x0000, 0x0005, 0x7500 },
+	/* D/K A2-3 */	{ AUD_A2,	0x1003, 0x0020, 0x0100, 0x2601,
+					0x5000, 0x0000, 0x0007, 0x7500 },
+	/* D/K NICAM */	{ AUD_NICAM,	0x1003, 0x0120, 0x0100, 0x2603,
+					0x5000, 0x0000, 0x000B, 0x7500 },
+	/* L/L' Mono */	{ AUD_MONO,	0x0003, 0x0200, 0x0100, 0x7C03,
+					0x5000, 0x2200, 0x0009, 0x7500 },
+	/* L/L' NICAM */{ AUD_NICAM_L,	0x0003, 0x0120, 0x0100, 0x7C03,
+					0x5000, 0x0000, 0x0009, 0x7500 },
+};
+
+#define MPX_NUM_MODES	ARRAY_SIZE(mpx_audio_modes)
+
+static int mpx_setup(struct sony_btf_mpx *t)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
+	u16 source = 0;
+	u8 buffer[3];
+	struct i2c_msg msg;
+	int mode = t->mpxmode;
+
+	/* reset MPX */
+	buffer[0] = 0x00;
+	buffer[1] = 0x80;
+	buffer[2] = 0x00;
+	msg.addr = client->addr;
+	msg.flags = 0;
+	msg.len = 3;
+	msg.buf = buffer;
+	i2c_transfer(client->adapter, &msg, 1);
+	buffer[1] = 0x00;
+	i2c_transfer(client->adapter, &msg, 1);
+
+	if (t->audmode != V4L2_TUNER_MODE_MONO)
+		mode++;
+
+	if (mpx_audio_modes[mode].audio_mode != AUD_MONO) {
+		switch (t->audmode) {
+		case V4L2_TUNER_MODE_MONO:
+			switch (mpx_audio_modes[mode].audio_mode) {
+			case AUD_A2:
+				source = mpx_audio_modes[mode].source;
+				break;
+			case AUD_NICAM:
+				source = 0x0000;
+				break;
+			case AUD_NICAM_L:
+				source = 0x0200;
+				break;
+			default:
+				break;
+			}
+			break;
+		case V4L2_TUNER_MODE_STEREO:
+			source = mpx_audio_modes[mode].source;
+			break;
+		case V4L2_TUNER_MODE_LANG1:
+			source = 0x0300;
+			break;
+		case V4L2_TUNER_MODE_LANG2:
+			source = 0x0400;
+			break;
+		}
+		source |= mpx_audio_modes[mode].source & 0x00ff;
+	} else
+		source = mpx_audio_modes[mode].source;
+
+	mpx_write(client, 0x10, 0x0030, mpx_audio_modes[mode].modus);
+	mpx_write(client, 0x12, 0x0008, source);
+	mpx_write(client, 0x12, 0x0013, mpx_audio_modes[mode].acb);
+	mpx_write(client, 0x12, 0x000e,
+			mpx_audio_modes[mode].fm_prescale);
+	mpx_write(client, 0x12, 0x0010,
+			mpx_audio_modes[mode].nicam_prescale);
+	mpx_write(client, 0x12, 0x000d,
+			mpx_audio_modes[mode].scart_prescale);
+	mpx_write(client, 0x10, 0x0020, mpx_audio_modes[mode].system);
+	mpx_write(client, 0x12, 0x0000, mpx_audio_modes[mode].volume);
+	if (mpx_audio_modes[mode].audio_mode == AUD_A2)
+		mpx_write(client, 0x10, 0x0022,
+			t->audmode == V4L2_TUNER_MODE_MONO ? 0x07f0 : 0x0190);
+
+#ifdef MPX_DEBUG
+	{
+		u8 buf1[3], buf2[2];
+		struct i2c_msg msgs[2];
+
+		v4l2_info(client,
+			"MPX registers: %04x %04x %04x %04x %04x %04x %04x %04x\n",
+			mpx_audio_modes[mode].modus,
+			source,
+			mpx_audio_modes[mode].acb,
+			mpx_audio_modes[mode].fm_prescale,
+			mpx_audio_modes[mode].nicam_prescale,
+			mpx_audio_modes[mode].scart_prescale,
+			mpx_audio_modes[mode].system,
+			mpx_audio_modes[mode].volume);
+		buf1[0] = 0x11;
+		buf1[1] = 0x00;
+		buf1[2] = 0x7e;
+		msgs[0].addr = client->addr;
+		msgs[0].flags = 0;
+		msgs[0].len = 3;
+		msgs[0].buf = buf1;
+		msgs[1].addr = client->addr;
+		msgs[1].flags = I2C_M_RD;
+		msgs[1].len = 2;
+		msgs[1].buf = buf2;
+		i2c_transfer(client->adapter, msgs, 2);
+		v4l2_info(client, "MPX system: %02x%02x\n",
+				buf2[0], buf2[1]);
+		buf1[0] = 0x11;
+		buf1[1] = 0x02;
+		buf1[2] = 0x00;
+		i2c_transfer(client->adapter, msgs, 2);
+		v4l2_info(client, "MPX status: %02x%02x\n",
+				buf2[0], buf2[1]);
+	}
+#endif
+	return 0;
+}
+
+
+static int sony_btf_mpx_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
+{
+	struct sony_btf_mpx *t = to_state(sd);
+	int default_mpx_mode = 0;
+
+	if (std & V4L2_STD_PAL_BG)
+		default_mpx_mode = 1;
+	else if (std & V4L2_STD_PAL_I)
+		default_mpx_mode = 4;
+	else if (std & V4L2_STD_PAL_DK)
+		default_mpx_mode = 6;
+	else if (std & V4L2_STD_SECAM_L)
+		default_mpx_mode = 11;
+
+	if (default_mpx_mode != t->mpxmode) {
+		t->mpxmode = default_mpx_mode;
+		mpx_setup(t);
+	}
+	return 0;
+}
+
+static int sony_btf_mpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
+{
+	struct sony_btf_mpx *t = to_state(sd);
+
+	vt->capability = V4L2_TUNER_CAP_NORM |
+		V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LANG1 |
+		V4L2_TUNER_CAP_LANG2;
+	vt->rxsubchans = V4L2_TUNER_SUB_MONO |
+		V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_LANG1 |
+		V4L2_TUNER_SUB_LANG2;
+	vt->audmode = t->audmode;
+	return 0;
+}
+
+static int sony_btf_mpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
+{
+	struct sony_btf_mpx *t = to_state(sd);
+
+	if (vt->type != V4L2_TUNER_ANALOG_TV)
+		return -EINVAL;
+
+	if (vt->audmode != t->audmode) {
+		t->audmode = vt->audmode;
+		mpx_setup(t);
+	}
+	return 0;
+}
+
+/* --------------------------------------------------------------------------*/
+
+static const struct v4l2_subdev_core_ops sony_btf_mpx_core_ops = {
+	.s_std = sony_btf_mpx_s_std,
+};
+
+static const struct v4l2_subdev_tuner_ops sony_btf_mpx_tuner_ops = {
+	.s_tuner = sony_btf_mpx_s_tuner,
+	.g_tuner = sony_btf_mpx_g_tuner,
+};
+
+static const struct v4l2_subdev_ops sony_btf_mpx_ops = {
+	.core = &sony_btf_mpx_core_ops,
+	.tuner = &sony_btf_mpx_tuner_ops,
+};
+
+/* --------------------------------------------------------------------------*/
+
+static int sony_btf_mpx_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct sony_btf_mpx *t;
+	struct v4l2_subdev *sd;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
+		return -ENODEV;
+
+	v4l_info(client, "chip found @ 0x%x (%s)\n",
+			client->addr << 1, client->adapter->name);
+
+	t = kzalloc(sizeof(struct sony_btf_mpx), GFP_KERNEL);
+	if (t == NULL)
+		return -ENOMEM;
+
+	sd = &t->sd;
+	v4l2_i2c_subdev_init(sd, client, &sony_btf_mpx_ops);
+
+	/* Initialize sony_btf_mpx */
+	t->mpxmode = 0;
+	t->audmode = V4L2_TUNER_MODE_STEREO;
+
+	return 0;
+}
+
+static int sony_btf_mpx_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+	v4l2_device_unregister_subdev(sd);
+	kfree(to_state(sd));
+
+	return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct i2c_device_id sony_btf_mpx_id[] = {
+	{ "sony-btf-mpx", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sony_btf_mpx_id);
+
+static struct i2c_driver sony_btf_mpx_driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= "sony-btf-mpx",
+	},
+	.probe = sony_btf_mpx_probe,
+	.remove = sony_btf_mpx_remove,
+	.id_table = sony_btf_mpx_id,
+};
+module_i2c_driver(sony_btf_mpx_driver);