V4L/DVB (4606): Add driver for TUA6100

This driver was originally in budget-av.c, however I have extracted it into
a seperate file to permit reuse.
I also reworked the code to make it maintainable. I then examined the KNC1
windows drivers and rewrote the code in order to configure the PLL as they
do. This solves a lot of reported tuning problems.

Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 205 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/tua6100.c b/drivers/media/dvb/frontends/tua6100.c
new file mode 100644
index 000000000000..88554393a9bf
--- /dev/null
+++ b/drivers/media/dvb/frontends/tua6100.c
@@ -0,0 +1,205 @@
+/**
+ * Driver for Infineon tua6100 pll.
+ *
+ * (c) 2006 Andrew de Quincey
+ *
+ * Based on code found in budget-av.c, which has the following:
+ * Compiled from various sources by Michael Hunold <michael@mihu.de>
+ *
+ * CI interface support (c) 2004 Olivier Gournet <ogournet@anevia.com> &
+ *                               Andrew de Quincey <adq_dvb@lidskialf.net>
+ *
+ * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
+ *
+ * Copyright (C) 1999-2002 Ralph  Metzler
+ *                       & Marcus Metzler for convergence integrated media GmbH
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/dvb/frontend.h>
+#include <asm/types.h>
+
+#include "tua6100.h"
+
+struct tua6100_priv {
+	/* i2c details */
+	int i2c_address;
+	struct i2c_adapter *i2c;
+	u32 frequency;
+};
+
+static int tua6100_release(struct dvb_frontend *fe)
+{
+	if (fe->tuner_priv)
+		kfree(fe->tuner_priv);
+	fe->tuner_priv = NULL;
+	return 0;
+}
+
+static int tua6100_sleep(struct dvb_frontend *fe)
+{
+	struct tua6100_priv *priv = fe->tuner_priv;
+	int ret;
+	u8 reg0[] = { 0x00, 0x00 };
+	struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 1);
+	if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
+		printk("%s: i2c error\n", __FUNCTION__);
+	}
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 0);
+
+	return (ret == 1) ? 0 : ret;
+}
+
+static int tua6100_set_params(struct dvb_frontend *fe,
+			      struct dvb_frontend_parameters *params)
+{
+	struct tua6100_priv *priv = fe->tuner_priv;
+	u32 div;
+	u32 prediv;
+	u8 reg0[] = { 0x00, 0x00 };
+	u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 };
+	u8 reg2[] = { 0x02, 0x00, 0x00 };
+	struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
+	struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 };
+	struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 };
+
+#define _R 4
+#define _P 32
+#define _ri 4000000
+
+	// setup register 0
+	if (params->frequency < 2000000) {
+		reg0[1] = 0x03;
+	} else {
+		reg0[1] = 0x07;
+	}
+
+	// setup register 1
+	if (params->frequency < 1630000) {
+		reg1[1] = 0x2c;
+	} else {
+		reg1[1] = 0x0c;
+	}
+	if (_P == 64)
+		reg1[1] |= 0x40;
+	if (params->frequency >= 1525000)
+		reg1[1] |= 0x80;
+
+	// register 2
+	reg2[1] = (_R >> 8) & 0x03;
+	reg2[2] = _R;
+	if (params->frequency < 1455000) {
+		reg2[1] |= 0x1c;
+	} else if (params->frequency < 1630000) {
+		reg2[1] |= 0x0c;
+	} else {
+		reg2[1] |= 0x1c;
+	}
+
+	// The N divisor ratio (note: params->frequency is in kHz, but we need it in Hz)
+	prediv = (params->frequency * _R) / (_ri / 1000);
+	div = prediv / _P;
+	reg1[1] |= (div >> 9) & 0x03;
+	reg1[2] = div >> 1;
+	reg1[3] = (div << 7);
+	priv->frequency = ((div * _P) * (_ri / 1000)) / _R;
+
+	// Finally, calculate and store the value for A
+	reg1[3] |= (prediv - (div*_P)) & 0x7f;
+
+#undef _R
+#undef _P
+#undef _ri
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 1);
+	if (i2c_transfer(priv->i2c, &msg0, 1) != 1)
+		return -EIO;
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 1);
+	if (i2c_transfer(priv->i2c, &msg2, 1) != 1)
+		return -EIO;
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 1);
+	if (i2c_transfer(priv->i2c, &msg1, 1) != 1)
+		return -EIO;
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 0);
+
+	return 0;
+}
+
+static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
+{
+	struct tua6100_priv *priv = fe->tuner_priv;
+	*frequency = priv->frequency;
+	return 0;
+}
+
+static struct dvb_tuner_ops tua6100_tuner_ops = {
+	.info = {
+		.name = "Infineon TUA6100",
+		.frequency_min = 950000,
+		.frequency_max = 2150000,
+		.frequency_step = 1000,
+	},
+	.release = tua6100_release,
+	.sleep = tua6100_sleep,
+	.set_params = tua6100_set_params,
+	.get_frequency = tua6100_get_frequency,
+};
+
+struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c)
+{
+	struct tua6100_priv *priv = NULL;
+	u8 b1 [] = { 0x80 };
+	u8 b2 [] = { 0x00 };
+	struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 },
+				  { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } };
+	int ret;
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 1);
+	ret = i2c_transfer (i2c, msg, 2);
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 0);
+
+	if (ret != 2)
+		return NULL;
+
+	priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL);
+	if (priv == NULL)
+		return NULL;
+
+	priv->i2c_address = addr;
+	priv->i2c = i2c;
+
+	memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops));
+	fe->tuner_priv = priv;
+	return fe;
+}
+EXPORT_SYMBOL(tua6100_attach);
+
+MODULE_DESCRIPTION("DVB tua6100 driver");
+MODULE_AUTHOR("Andrew de Quincey");
+MODULE_LICENSE("GPL");