Initial import

1 files changed, 230 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/tda8261.c b/drivers/media/dvb-frontends/tda8261.c
new file mode 100644
index 000000000..19c488814
--- /dev/null
+++ b/drivers/media/dvb-frontends/tda8261.c
@@ -0,0 +1,230 @@
+/*
+	TDA8261 8PSK/QPSK tuner driver
+	Copyright (C) Manu Abraham (abraham.manu@gmail.com)
+
+	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/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "dvb_frontend.h"
+#include "tda8261.h"
+
+struct tda8261_state {
+	struct dvb_frontend		*fe;
+	struct i2c_adapter		*i2c;
+	const struct tda8261_config	*config;
+
+	/* state cache */
+	u32 frequency;
+	u32 bandwidth;
+};
+
+static int tda8261_read(struct tda8261_state *state, u8 *buf)
+{
+	const struct tda8261_config *config = state->config;
+	int err = 0;
+	struct i2c_msg msg = { .addr	= config->addr, .flags = I2C_M_RD,.buf = buf,  .len = 1 };
+
+	if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
+		pr_err("%s: read error, err=%d\n", __func__, err);
+
+	return err;
+}
+
+static int tda8261_write(struct tda8261_state *state, u8 *buf)
+{
+	const struct tda8261_config *config = state->config;
+	int err = 0;
+	struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 };
+
+	if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
+		pr_err("%s: write error, err=%d\n", __func__, err);
+
+	return err;
+}
+
+static int tda8261_get_status(struct dvb_frontend *fe, u32 *status)
+{
+	struct tda8261_state *state = fe->tuner_priv;
+	u8 result = 0;
+	int err = 0;
+
+	*status = 0;
+
+	if ((err = tda8261_read(state, &result)) < 0) {
+		pr_err("%s: I/O Error\n", __func__);
+		return err;
+	}
+	if ((result >> 6) & 0x01) {
+		pr_debug("%s: Tuner Phase Locked\n", __func__);
+		*status = 1;
+	}
+
+	return err;
+}
+
+static const u32 div_tab[] = { 2000, 1000,  500,  250,  125 }; /* kHz */
+static const u8  ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 };
+
+static int tda8261_get_state(struct dvb_frontend *fe,
+			     enum tuner_param param,
+			     struct tuner_state *tstate)
+{
+	struct tda8261_state *state = fe->tuner_priv;
+	int err = 0;
+
+	switch (param) {
+	case DVBFE_TUNER_FREQUENCY:
+		tstate->frequency = state->frequency;
+		break;
+	case DVBFE_TUNER_BANDWIDTH:
+		tstate->bandwidth = 40000000; /* FIXME! need to calculate Bandwidth */
+		break;
+	default:
+		pr_err("%s: Unknown parameter (param=%d)\n", __func__, param);
+		err = -EINVAL;
+		break;
+	}
+
+	return err;
+}
+
+static int tda8261_set_state(struct dvb_frontend *fe,
+			     enum tuner_param param,
+			     struct tuner_state *tstate)
+{
+	struct tda8261_state *state = fe->tuner_priv;
+	const struct tda8261_config *config = state->config;
+	u32 frequency, N, status = 0;
+	u8 buf[4];
+	int err = 0;
+
+	if (param & DVBFE_TUNER_FREQUENCY) {
+		/**
+		 * N = Max VCO Frequency / Channel Spacing
+		 * Max VCO Frequency = VCO frequency + (channel spacing - 1)
+		 * (to account for half channel spacing on either side)
+		 */
+		frequency = tstate->frequency;
+		if ((frequency < 950000) || (frequency > 2150000)) {
+			pr_warn("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
+			return -EINVAL;
+		}
+		N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
+		pr_debug("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n",
+			__func__, config->step_size, div_tab[config->step_size], N, N);
+
+		buf[0] = (N >> 8) & 0xff;
+		buf[1] = N & 0xff;
+		buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1);
+
+		if (frequency < 1450000)
+			buf[3] = 0x00;
+		else if (frequency < 2000000)
+			buf[3] = 0x40;
+		else if (frequency < 2150000)
+			buf[3] = 0x80;
+
+		/* Set params */
+		if ((err = tda8261_write(state, buf)) < 0) {
+			pr_err("%s: I/O Error\n", __func__);
+			return err;
+		}
+		/* sleep for some time */
+		pr_debug("%s: Waiting to Phase LOCK\n", __func__);
+		msleep(20);
+		/* check status */
+		if ((err = tda8261_get_status(fe, &status)) < 0) {
+			pr_err("%s: I/O Error\n", __func__);
+			return err;
+		}
+		if (status == 1) {
+			pr_debug("%s: Tuner Phase locked: status=%d\n", __func__, status);
+			state->frequency = frequency; /* cache successful state */
+		} else {
+			pr_debug("%s: No Phase lock: status=%d\n", __func__, status);
+		}
+	} else {
+		pr_err("%s: Unknown parameter (param=%d)\n", __func__, param);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int tda8261_release(struct dvb_frontend *fe)
+{
+	struct tda8261_state *state = fe->tuner_priv;
+
+	fe->tuner_priv = NULL;
+	kfree(state);
+	return 0;
+}
+
+static struct dvb_tuner_ops tda8261_ops = {
+
+	.info = {
+		.name		= "TDA8261",
+//		.tuner_name	= NULL,
+		.frequency_min	=  950000,
+		.frequency_max	= 2150000,
+		.frequency_step = 0
+	},
+
+	.set_state	= tda8261_set_state,
+	.get_state	= tda8261_get_state,
+	.get_status	= tda8261_get_status,
+	.release	= tda8261_release
+};
+
+struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
+				    const struct tda8261_config *config,
+				    struct i2c_adapter *i2c)
+{
+	struct tda8261_state *state = NULL;
+
+	if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL)
+		goto exit;
+
+	state->config		= config;
+	state->i2c		= i2c;
+	state->fe		= fe;
+	fe->tuner_priv		= state;
+	fe->ops.tuner_ops	= tda8261_ops;
+
+	fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size];
+//	fe->ops.tuner_ops.tuner_name	 = &config->buf;
+
+//	printk("%s: Attaching %s TDA8261 8PSK/QPSK tuner\n",
+//		__func__, fe->ops.tuner_ops.tuner_name);
+	pr_info("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
+
+	return fe;
+
+exit:
+	kfree(state);
+	return NULL;
+}
+
+EXPORT_SYMBOL(tda8261_attach);
+
+MODULE_AUTHOR("Manu Abraham");
+MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
+MODULE_LICENSE("GPL");