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path: root/drivers/media/dvb/frontends/tda8261.c
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Diffstat (limited to 'drivers/media/dvb/frontends/tda8261.c')
-rw-r--r--drivers/media/dvb/frontends/tda8261.c230
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 00000000..53c7d8f1
--- /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)
+ printk("%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)
+ printk("%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) {
+ printk("%s: I/O Error\n", __func__);
+ return err;
+ }
+ if ((result >> 6) & 0x01) {
+ printk("%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:
+ printk("%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)) {
+ printk("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
+ return -EINVAL;
+ }
+ N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
+ printk("%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) {
+ printk("%s: I/O Error\n", __func__);
+ return err;
+ }
+ /* sleep for some time */
+ printk("%s: Waiting to Phase LOCK\n", __func__);
+ msleep(20);
+ /* check status */
+ if ((err = tda8261_get_status(fe, &status)) < 0) {
+ printk("%s: I/O Error\n", __func__);
+ return err;
+ }
+ if (status == 1) {
+ printk("%s: Tuner Phase locked: status=%d\n", __func__, status);
+ state->frequency = frequency; /* cache successful state */
+ } else {
+ printk("%s: No Phase lock: status=%d\n", __func__, status);
+ }
+ } else {
+ printk("%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);
+ printk("%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");
generated by cgit (git 2.34.1) at 2024-12-23 01:06:54 +0000