1 files changed, 435 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/cx22700.c b/drivers/media/dvb/frontends/cx22700.c
new file mode 100644
index 000000000000..a212279042b8
--- /dev/null
+++ b/drivers/media/dvb/frontends/cx22700.c
@@ -0,0 +1,435 @@
+/*
+    Conexant cx22700 DVB OFDM demodulator driver
+
+    Copyright (C) 2001-2002 Convergence Integrated Media GmbH
+        Holger Waechtler <holger@convergence.de>
+
+    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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include "dvb_frontend.h"
+#include "cx22700.h"
+
+
+struct cx22700_state {
+
+        struct i2c_adapter* i2c;
+
+        struct dvb_frontend_ops ops;
+
+        const struct cx22700_config* config;
+
+        struct dvb_frontend frontend;
+};
+
+
+static int debug;
+#define dprintk(args...) \
+        do { \
+                if (debug) printk(KERN_DEBUG "cx22700: " args); \
+        } while (0)
+
+static u8 init_tab [] = {
+        0x04, 0x10,
+        0x05, 0x09,
+        0x06, 0x00,
+        0x08, 0x04,
+        0x09, 0x00,
+        0x0a, 0x01,
+        0x15, 0x40,
+        0x16, 0x10,
+        0x17, 0x87,
+        0x18, 0x17,
+        0x1a, 0x10,
+        0x25, 0x04,
+        0x2e, 0x00,
+        0x39, 0x00,
+        0x3a, 0x04,
+        0x45, 0x08,
+        0x46, 0x02,
+        0x47, 0x05,
+};
+
+
+static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
+{
+        int ret;
+        u8 buf [] = { reg, data };
+        struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
+
+        dprintk ("%s\n", __FUNCTION__);
+
+        ret = i2c_transfer (state->i2c, &msg, 1);
+
+        if (ret != 1)
+                printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
+                        __FUNCTION__, reg, data, ret);
+
+        return (ret != 1) ? -1 : 0;
+}
+
+static int cx22700_readreg (struct cx22700_state* state, u8 reg)
+{
+        int ret;
+        u8 b0 [] = { reg };
+        u8 b1 [] = { 0 };
+        struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
+                           { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
+
+        dprintk ("%s\n", __FUNCTION__);
+
+        ret = i2c_transfer (state->i2c, msg, 2);
+
+        if (ret != 2) return -EIO;
+
+        return b1[0];
+}
+
+static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
+{
+        u8 val;
+
+        dprintk ("%s\n", __FUNCTION__);
+
+        switch (inversion) {
+        case INVERSION_AUTO:
+                return -EOPNOTSUPP;
+        case INVERSION_ON:
+                val = cx22700_readreg (state, 0x09);
+                return cx22700_writereg (state, 0x09, val | 0x01);
+        case INVERSION_OFF:
+                val = cx22700_readreg (state, 0x09);
+                return cx22700_writereg (state, 0x09, val & 0xfe);
+        default:
+                return -EINVAL;
+        }
+}
+
+static int cx22700_set_tps (struct cx22700_state *state, struct dvb_ofdm_parameters *p)
+{
+        static const u8 qam_tab [4] = { 0, 1, 0, 2 };
+        static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
+        u8 val;
+
+        dprintk ("%s\n", __FUNCTION__);
+
+        if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
+                return -EINVAL;
+
+        if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
+
+        if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
+                return -EINVAL;
+
+        if (p->guard_interval < GUARD_INTERVAL_1_32 ||
+            p->guard_interval > GUARD_INTERVAL_1_4)
+                return -EINVAL;
+
+        if (p->transmission_mode != TRANSMISSION_MODE_2K &&
+            p->transmission_mode != TRANSMISSION_MODE_8K)
+                return -EINVAL;
+
+        if (p->constellation != QPSK &&
+            p->constellation != QAM_16 &&
+            p->constellation != QAM_64)
+                return -EINVAL;
+
+        if (p->hierarchy_information < HIERARCHY_NONE ||
+            p->hierarchy_information > HIERARCHY_4)
+                return -EINVAL;
+
+        if (p->bandwidth < BANDWIDTH_8_MHZ && p->bandwidth > BANDWIDTH_6_MHZ)
+                return -EINVAL;
+
+        if (p->bandwidth == BANDWIDTH_7_MHZ)
+                cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
+        else
+                cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
+
+        val = qam_tab[p->constellation - QPSK];
+        val |= p->hierarchy_information - HIERARCHY_NONE;
+
+        cx22700_writereg (state, 0x04, val);
+
+        val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
+        val |= fec_tab[p->code_rate_LP - FEC_1_2];
+
+        cx22700_writereg (state, 0x05, val);
+
+        val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
+        val |= p->transmission_mode - TRANSMISSION_MODE_2K;
+
+        cx22700_writereg (state, 0x06, val);
+
+        cx22700_writereg (state, 0x08, 0x04 | 0x02);  /* use user tps parameters */
+        cx22700_writereg (state, 0x08, 0x04);         /* restart aquisition */
+
+        return 0;
+}
+
+static int cx22700_get_tps (struct cx22700_state* state, struct dvb_ofdm_parameters *p)
+{
+        static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
+        static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
+                                                    FEC_5_6, FEC_7_8 };
+        u8 val;
+
+        dprintk ("%s\n", __FUNCTION__);
+
+        if (!(cx22700_readreg(state, 0x07) & 0x20))  /*  tps valid? */
+                return -EAGAIN;
+
+        val = cx22700_readreg (state, 0x01);
+
+        if ((val & 0x7) > 4)
+                p->hierarchy_information = HIERARCHY_AUTO;
+        else
+                p->hierarchy_information = HIERARCHY_NONE + (val & 0x7);
+
+        if (((val >> 3) & 0x3) > 2)
+                p->constellation = QAM_AUTO;
+        else
+                p->constellation = qam_tab[(val >> 3) & 0x3];
+
+        val = cx22700_readreg (state, 0x02);
+
+        if (((val >> 3) & 0x07) > 4)
+                p->code_rate_HP = FEC_AUTO;
+        else
+                p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
+
+        if ((val & 0x07) > 4)
+                p->code_rate_LP = FEC_AUTO;
+        else
+                p->code_rate_LP = fec_tab[val & 0x07];
+
+        val = cx22700_readreg (state, 0x03);
+
+        p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
+        p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
+
+        return 0;
+}
+
+static int cx22700_init (struct dvb_frontend* fe)
+
+{       struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+        int i;
+
+        dprintk("cx22700_init: init chip\n");
+
+        cx22700_writereg (state, 0x00, 0x02);   /*  soft reset */
+        cx22700_writereg (state, 0x00, 0x00);
+
+        msleep(10);
+
+        for (i=0; i<sizeof(init_tab); i+=2)
+                cx22700_writereg (state, init_tab[i], init_tab[i+1]);
+
+        cx22700_writereg (state, 0x00, 0x01);
+
+        if (state->config->pll_init) {
+                cx22700_writereg (state, 0x0a, 0x00);  /* open i2c bus switch */
+                state->config->pll_init(fe);
+                cx22700_writereg (state, 0x0a, 0x01);  /* close i2c bus switch */
+        }
+
+        return 0;
+}
+
+static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+        struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+
+        u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
+                   | (cx22700_readreg (state, 0x0e) << 1);
+        u8 sync = cx22700_readreg (state, 0x07);
+
+        *status = 0;
+
+        if (rs_ber < 0xff00)
+                *status |= FE_HAS_SIGNAL;
+
+        if (sync & 0x20)
+                *status |= FE_HAS_CARRIER;
+
+        if (sync & 0x10)
+                *status |= FE_HAS_VITERBI;
+
+        if (sync & 0x10)
+                *status |= FE_HAS_SYNC;
+
+        if (*status == 0x0f)
+                *status |= FE_HAS_LOCK;
+
+        return 0;
+}
+
+static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
+{
+        struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+
+        *ber = cx22700_readreg (state, 0x0c) & 0x7f;
+        cx22700_writereg (state, 0x0c, 0x00);
+
+        return 0;
+}
+
+static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
+{
+        struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+
+        u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
+                   | (cx22700_readreg (state, 0x0e) << 1);
+        *signal_strength = ~rs_ber;
+
+        return 0;
+}
+
+static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+        struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+
+        u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
+                   | (cx22700_readreg (state, 0x0e) << 1);
+        *snr = ~rs_ber;
+
+        return 0;
+}
+
+static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
+{
+        struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+
+        *ucblocks = cx22700_readreg (state, 0x0f);
+        cx22700_writereg (state, 0x0f, 0x00);
+
+        return 0;
+}
+
+static int cx22700_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
+{
+        struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+
+        cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
+        cx22700_writereg (state, 0x00, 0x00);
+
+        cx22700_writereg (state, 0x0a, 0x00);  /* open i2c bus switch */
+        state->config->pll_set(fe, p);
+        cx22700_writereg (state, 0x0a, 0x01);  /* close i2c bus switch */
+        cx22700_set_inversion (state, p->inversion);
+        cx22700_set_tps (state, &p->u.ofdm);
+        cx22700_writereg (state, 0x37, 0x01);  /* PAL loop filter off */
+        cx22700_writereg (state, 0x00, 0x01);  /* restart acquire */
+
+        return 0;
+}
+
+static int cx22700_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
+{
+        struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+        u8 reg09 = cx22700_readreg (state, 0x09);
+
+        p->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
+        return cx22700_get_tps (state, &p->u.ofdm);
+}
+
+static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
+{
+        fesettings->min_delay_ms = 150;
+        fesettings->step_size = 166667;
+        fesettings->max_drift = 166667*2;
+        return 0;
+}
+
+static void cx22700_release(struct dvb_frontend* fe)
+{
+        struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
+        kfree(state);
+}
+
+static struct dvb_frontend_ops cx22700_ops;
+
+struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
+                                    struct i2c_adapter* i2c)
+{
+        struct cx22700_state* state = NULL;
+
+        /* allocate memory for the internal state */
+        state = (struct cx22700_state*) kmalloc(sizeof(struct cx22700_state), GFP_KERNEL);
+        if (state == NULL) goto error;
+
+        /* setup the state */
+        state->config = config;
+        state->i2c = i2c;
+        memcpy(&state->ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
+
+        /* check if the demod is there */
+        if (cx22700_readreg(state, 0x07) < 0) goto error;
+
+        /* create dvb_frontend */
+        state->frontend.ops = &state->ops;
+        state->frontend.demodulator_priv = state;
+        return &state->frontend;
+
+error:
+        kfree(state);
+        return NULL;
+}
+
+static struct dvb_frontend_ops cx22700_ops = {
+
+        .info = {
+                .name                   = "Conexant CX22700 DVB-T",
+                .type                   = FE_OFDM,
+                .frequency_min          = 470000000,
+                .frequency_max          = 860000000,
+                .frequency_stepsize     = 166667,
+                .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
+                      FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
+                      FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
+                      FE_CAN_RECOVER
+        },
+
+        .release = cx22700_release,
+
+        .init = cx22700_init,
+
+        .set_frontend = cx22700_set_frontend,
+        .get_frontend = cx22700_get_frontend,
+        .get_tune_settings = cx22700_get_tune_settings,
+
+        .read_status = cx22700_read_status,
+        .read_ber = cx22700_read_ber,
+        .read_signal_strength = cx22700_read_signal_strength,
+        .read_snr = cx22700_read_snr,
+        .read_ucblocks = cx22700_read_ucblocks,
+};
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
+MODULE_AUTHOR("Holger Waechtler");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(cx22700_attach);