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path: root/drivers/media/dvb-frontends/tda665x.c
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Diffstat (limited to 'drivers/media/dvb-frontends/tda665x.c')
-rw-r--r--drivers/media/dvb-frontends/tda665x.c246
1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/tda665x.c b/drivers/media/dvb-frontends/tda665x.c
new file mode 100644
index 000000000..8766c9ff6
--- /dev/null
+++ b/drivers/media/dvb-frontends/tda665x.c
@@ -0,0 +1,246 @@
+/*
+ TDA665x 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 <media/dvb_frontend.h>
+#include "tda665x.h"
+
+struct tda665x_state {
+ struct dvb_frontend *fe;
+ struct i2c_adapter *i2c;
+ const struct tda665x_config *config;
+
+ u32 frequency;
+ u32 bandwidth;
+};
+
+static int tda665x_read(struct tda665x_state *state, u8 *buf)
+{
+ const struct tda665x_config *config = state->config;
+ int err = 0;
+ struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 };
+
+ err = i2c_transfer(state->i2c, &msg, 1);
+ if (err != 1)
+ goto exit;
+
+ return err;
+exit:
+ printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
+ return err;
+}
+
+static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length)
+{
+ const struct tda665x_config *config = state->config;
+ int err = 0;
+ struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length };
+
+ err = i2c_transfer(state->i2c, &msg, 1);
+ if (err != 1)
+ goto exit;
+
+ return err;
+exit:
+ printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
+ return err;
+}
+
+static int tda665x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
+{
+ struct tda665x_state *state = fe->tuner_priv;
+
+ *frequency = state->frequency;
+
+ return 0;
+}
+
+static int tda665x_get_status(struct dvb_frontend *fe, u32 *status)
+{
+ struct tda665x_state *state = fe->tuner_priv;
+ u8 result = 0;
+ int err = 0;
+
+ *status = 0;
+
+ err = tda665x_read(state, &result);
+ if (err < 0)
+ goto exit;
+
+ if ((result >> 6) & 0x01) {
+ printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__);
+ *status = 1;
+ }
+
+ return err;
+exit:
+ printk(KERN_ERR "%s: I/O Error\n", __func__);
+ return err;
+}
+
+static int tda665x_set_frequency(struct dvb_frontend *fe,
+ u32 new_frequency)
+{
+ struct tda665x_state *state = fe->tuner_priv;
+ const struct tda665x_config *config = state->config;
+ u32 frequency, status = 0;
+ u8 buf[4];
+ int err = 0;
+
+ if ((new_frequency < config->frequency_max)
+ || (new_frequency > config->frequency_min)) {
+ printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n",
+ __func__, new_frequency);
+ return -EINVAL;
+ }
+
+ frequency = new_frequency;
+
+ frequency += config->frequency_offst;
+ frequency *= config->ref_multiplier;
+ frequency += config->ref_divider >> 1;
+ frequency /= config->ref_divider;
+
+ buf[0] = (u8) ((frequency & 0x7f00) >> 8);
+ buf[1] = (u8) (frequency & 0x00ff) >> 0;
+ buf[2] = 0x80 | 0x40 | 0x02;
+ buf[3] = 0x00;
+
+ /* restore frequency */
+ frequency = new_frequency;
+
+ if (frequency < 153000000) {
+ /* VHF-L */
+ buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */
+ if (frequency < 68000000)
+ buf[3] |= 0x40; /* 83uA */
+ if (frequency < 1040000000)
+ buf[3] |= 0x60; /* 122uA */
+ if (frequency < 1250000000)
+ buf[3] |= 0x80; /* 163uA */
+ else
+ buf[3] |= 0xa0; /* 254uA */
+ } else if (frequency < 438000000) {
+ /* VHF-H */
+ buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */
+ if (frequency < 230000000)
+ buf[3] |= 0x40;
+ if (frequency < 300000000)
+ buf[3] |= 0x60;
+ else
+ buf[3] |= 0x80;
+ } else {
+ /* UHF */
+ buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */
+ if (frequency < 470000000)
+ buf[3] |= 0x60;
+ if (frequency < 526000000)
+ buf[3] |= 0x80;
+ else
+ buf[3] |= 0xa0;
+ }
+
+ /* Set params */
+ err = tda665x_write(state, buf, 5);
+ if (err < 0)
+ goto exit;
+
+ /* sleep for some time */
+ printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__);
+ msleep(20);
+ /* check status */
+ err = tda665x_get_status(fe, &status);
+ if (err < 0)
+ goto exit;
+
+ if (status == 1) {
+ printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n",
+ __func__, status);
+ state->frequency = frequency; /* cache successful state */
+ } else {
+ printk(KERN_ERR "%s: No Phase lock: status=%d\n",
+ __func__, status);
+ }
+
+ return 0;
+exit:
+ printk(KERN_ERR "%s: I/O Error\n", __func__);
+ return err;
+}
+
+static int tda665x_set_params(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+ tda665x_set_frequency(fe, c->frequency);
+
+ return 0;
+}
+
+static void tda665x_release(struct dvb_frontend *fe)
+{
+ struct tda665x_state *state = fe->tuner_priv;
+
+ fe->tuner_priv = NULL;
+ kfree(state);
+}
+
+static const struct dvb_tuner_ops tda665x_ops = {
+ .get_status = tda665x_get_status,
+ .set_params = tda665x_set_params,
+ .get_frequency = tda665x_get_frequency,
+ .release = tda665x_release
+};
+
+struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe,
+ const struct tda665x_config *config,
+ struct i2c_adapter *i2c)
+{
+ struct tda665x_state *state = NULL;
+ struct dvb_tuner_info *info;
+
+ state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL);
+ if (!state)
+ return NULL;
+
+ state->config = config;
+ state->i2c = i2c;
+ state->fe = fe;
+ fe->tuner_priv = state;
+ fe->ops.tuner_ops = tda665x_ops;
+ info = &fe->ops.tuner_ops.info;
+
+ memcpy(info->name, config->name, sizeof(config->name));
+ info->frequency_min_hz = config->frequency_min;
+ info->frequency_max_hz = config->frequency_max;
+ info->frequency_step_hz = config->frequency_offst;
+
+ printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name);
+
+ return fe;
+}
+EXPORT_SYMBOL(tda665x_attach);
+
+MODULE_DESCRIPTION("TDA665x driver");
+MODULE_AUTHOR("Manu Abraham");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 11:01:26 +0000