1 files changed, 187 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/tda826x.c b/drivers/media/dvb/frontends/tda826x.c
new file mode 100644
index 00000000000..06c94800b94
--- /dev/null
+++ b/drivers/media/dvb/frontends/tda826x.c
@@ -0,0 +1,187 @@
+  /*
+     Driver for Philips tda8262/tda8263 DVBS Silicon tuners
+
+     (c) 2006 Andrew de Quincey
+
+     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/slab.h>
+#include <linux/module.h>
+#include <linux/dvb/frontend.h>
+#include <asm/types.h>
+
+#include "tda826x.h"
+
+static int debug;
+#define dprintk(args...) \
+        do { \
+                if (debug) printk(KERN_DEBUG "tda826x: " args); \
+        } while (0)
+
+struct tda826x_priv {
+        /* i2c details */
+        int i2c_address;
+        struct i2c_adapter *i2c;
+        u8 has_loopthrough:1;
+        u32 frequency;
+};
+
+static int tda826x_release(struct dvb_frontend *fe)
+{
+        kfree(fe->tuner_priv);
+        fe->tuner_priv = NULL;
+        return 0;
+}
+
+static int tda826x_sleep(struct dvb_frontend *fe)
+{
+        struct tda826x_priv *priv = fe->tuner_priv;
+        int ret;
+        u8 buf [] = { 0x00, 0x8d };
+        struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 };
+
+        dprintk("%s:\n", __func__);
+
+        if (!priv->has_loopthrough)
+                buf[1] = 0xad;
+
+        if (fe->ops.i2c_gate_ctrl)
+                fe->ops.i2c_gate_ctrl(fe, 1);
+        if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
+                dprintk("%s: i2c error\n", __func__);
+        }
+        if (fe->ops.i2c_gate_ctrl)
+                fe->ops.i2c_gate_ctrl(fe, 0);
+
+        return (ret == 1) ? 0 : ret;
+}
+
+static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
+{
+        struct tda826x_priv *priv = fe->tuner_priv;
+        int ret;
+        u32 div;
+        u32 ksyms;
+        u32 bandwidth;
+        u8 buf [11];
+        struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 };
+
+        dprintk("%s:\n", __func__);
+
+        div = (params->frequency + (1000-1)) / 1000;
+
+        /* BW = ((1 + RO) * SR/2 + 5) * 1.3      [SR in MSPS, BW in MHz] */
+        /* with R0 = 0.35 and some transformations: */
+        ksyms = params->u.qpsk.symbol_rate / 1000;
+        bandwidth = (878 * ksyms + 6500000) / 1000000 + 1;
+        if (bandwidth < 5)
+                bandwidth = 5;
+        else if (bandwidth > 36)
+                bandwidth = 36;
+
+        buf[0] = 0x00; // subaddress
+        buf[1] = 0x09; // powerdown RSSI + the magic value 1
+        if (!priv->has_loopthrough)
+                buf[1] |= 0x20; // power down loopthrough if not needed
+        buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO
+        buf[3] = div >> 7;
+        buf[4] = div << 1;
+        buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */
+        buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation
+        buf[7] = 0x83; // charge pumps at high, tests off
+        buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.
+        buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL
+        buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on
+
+        if (fe->ops.i2c_gate_ctrl)
+                fe->ops.i2c_gate_ctrl(fe, 1);
+        if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
+                dprintk("%s: i2c error\n", __func__);
+        }
+        if (fe->ops.i2c_gate_ctrl)
+                fe->ops.i2c_gate_ctrl(fe, 0);
+
+        priv->frequency = div * 1000;
+
+        return (ret == 1) ? 0 : ret;
+}
+
+static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
+{
+        struct tda826x_priv *priv = fe->tuner_priv;
+        *frequency = priv->frequency;
+        return 0;
+}
+
+static struct dvb_tuner_ops tda826x_tuner_ops = {
+        .info = {
+                .name = "Philips TDA826X",
+                .frequency_min = 950000,
+                .frequency_max = 2175000
+        },
+        .release = tda826x_release,
+        .sleep = tda826x_sleep,
+        .set_params = tda826x_set_params,
+        .get_frequency = tda826x_get_frequency,
+};
+
+struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough)
+{
+        struct tda826x_priv *priv = NULL;
+        u8 b1 [] = { 0, 0 };
+        struct i2c_msg msg[2] = {
+                { .addr = addr, .flags = 0,        .buf = NULL, .len = 0 },
+                { .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 }
+        };
+        int ret;
+
+        dprintk("%s:\n", __func__);
+
+        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;
+        if (!(b1[1] & 0x80))
+                return NULL;
+
+        priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL);
+        if (priv == NULL)
+                return NULL;
+
+        priv->i2c_address = addr;
+        priv->i2c = i2c;
+        priv->has_loopthrough = has_loopthrough;
+
+        memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops));
+
+        fe->tuner_priv = priv;
+
+        return fe;
+}
+EXPORT_SYMBOL(tda826x_attach);
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+MODULE_DESCRIPTION("DVB TDA826x driver");
+MODULE_AUTHOR("Andrew de Quincey");
+MODULE_LICENSE("GPL");