V4L/DVB (13363): ec100: add new driver for E3C EC100 DVB-T demodulator

E3C EC100 DVB-T demodulator driver

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

5 files changed, 428 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/Kconfig b/drivers/media/dvb/frontends/Kconfig
index d7c4837fa71c..4f785f549d02 100644
--- a/drivers/media/dvb/frontends/Kconfig
+++ b/drivers/media/dvb/frontends/Kconfig
@@ -342,6 +342,13 @@ config DVB_AF9013
         help
           Say Y when you want to support this frontend.
 
+config DVB_EC100
+        tristate "E3C EC100"
+        depends on DVB_CORE && I2C
+        default m if DVB_FE_CUSTOMISE
+        help
+          Say Y when you want to support this frontend.
+
 comment "DVB-C (cable) frontends"
         depends on DVB_CORE
 
diff --git a/drivers/media/dvb/frontends/Makefile b/drivers/media/dvb/frontends/Makefile
index 3523767e7a76..1ca758eeff59 100644
--- a/drivers/media/dvb/frontends/Makefile
+++ b/drivers/media/dvb/frontends/Makefile
@@ -76,3 +76,4 @@ obj-$(CONFIG_DVB_STV0900) += stv0900.o
 obj-$(CONFIG_DVB_STV090x) += stv090x.o
 obj-$(CONFIG_DVB_STV6110x) += stv6110x.o
 obj-$(CONFIG_DVB_ISL6423) += isl6423.o
+obj-$(CONFIG_DVB_EC100) += ec100.o
diff --git a/drivers/media/dvb/frontends/ec100.c b/drivers/media/dvb/frontends/ec100.c
new file mode 100644
index 000000000000..2414dc6ee5d9
--- /dev/null
+++ b/drivers/media/dvb/frontends/ec100.c
@@ -0,0 +1,335 @@
+/*
+ * E3C EC100 demodulator driver
+ *
+ * Copyright (C) 2009 Antti Palosaari <crope@iki.fi>
+ *
+ *    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 "dvb_frontend.h"
+#include "ec100_priv.h"
+#include "ec100.h"
+
+int ec100_debug;
+module_param_named(debug, ec100_debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+struct ec100_state {
+        struct i2c_adapter *i2c;
+        struct dvb_frontend frontend;
+        struct ec100_config config;
+
+        u16 ber;
+};
+
+/* write single register */
+static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
+{
+        u8 buf[2] = {reg, val};
+        struct i2c_msg msg = {
+                .addr = state->config.demod_address,
+                .flags = 0,
+                .len = 2,
+                .buf = buf};
+
+        if (i2c_transfer(state->i2c, &msg, 1) != 1) {
+                warn("I2C write failed reg:%02x", reg);
+                return -EREMOTEIO;
+        }
+        return 0;
+}
+
+/* read single register */
+static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
+{
+        struct i2c_msg msg[2] = {
+                {
+                        .addr = state->config.demod_address,
+                        .flags = 0,
+                        .len = 1,
+                        .buf = &reg
+                }, {
+                        .addr = state->config.demod_address,
+                        .flags = I2C_M_RD,
+                        .len = 1,
+                        .buf = val
+                }
+        };
+
+        if (i2c_transfer(state->i2c, msg, 2) != 2) {
+                warn("I2C read failed reg:%02x", reg);
+                return -EREMOTEIO;
+        }
+        return 0;
+}
+
+static int ec100_set_frontend(struct dvb_frontend *fe,
+        struct dvb_frontend_parameters *params)
+{
+        struct ec100_state *state = fe->demodulator_priv;
+        int ret;
+        u8 tmp, tmp2;
+
+        deb_info("%s: freq:%d bw:%d\n", __func__, params->frequency,
+                params->u.ofdm.bandwidth);
+
+        /* program tuner */
+        if (fe->ops.tuner_ops.set_params)
+                fe->ops.tuner_ops.set_params(fe, params);
+
+        ret = ec100_write_reg(state, 0x04, 0x06);
+        if (ret)
+                goto error;
+        ret = ec100_write_reg(state, 0x67, 0x58);
+        if (ret)
+                goto error;
+        ret = ec100_write_reg(state, 0x05, 0x18);
+        if (ret)
+                goto error;
+
+        /* reg/bw |   6  |   7  |   8
+           -------+------+------+------
+           A 0x1b | 0xa1 | 0xe7 | 0x2c
+           A 0x1c | 0x55 | 0x63 | 0x72
+           -------+------+------+------
+           B 0x1b | 0xb7 | 0x00 | 0x49
+           B 0x1c | 0x55 | 0x64 | 0x72 */
+
+        switch (params->u.ofdm.bandwidth) {
+        case BANDWIDTH_6_MHZ:
+                tmp = 0xb7;
+                tmp2 = 0x55;
+                break;
+        case BANDWIDTH_7_MHZ:
+                tmp = 0x00;
+                tmp2 = 0x64;
+                break;
+        case BANDWIDTH_8_MHZ:
+        default:
+                tmp = 0x49;
+                tmp2 = 0x72;
+        }
+
+        ret = ec100_write_reg(state, 0x1b, tmp);
+        if (ret)
+                goto error;
+        ret = ec100_write_reg(state, 0x1c, tmp2);
+        if (ret)
+                goto error;
+
+        ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */
+        if (ret)
+                goto error;
+        ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */
+        if (ret)
+                goto error;
+
+        ret = ec100_write_reg(state, 0x08, 0x24);
+        if (ret)
+                goto error;
+
+        ret = ec100_write_reg(state, 0x00, 0x00); /* go */
+        if (ret)
+                goto error;
+        ret = ec100_write_reg(state, 0x00, 0x20); /* go */
+        if (ret)
+                goto error;
+
+        return ret;
+error:
+        deb_info("%s: failed:%d\n", __func__, ret);
+        return ret;
+}
+
+static int ec100_get_tune_settings(struct dvb_frontend *fe,
+        struct dvb_frontend_tune_settings *fesettings)
+{
+        fesettings->min_delay_ms = 300;
+        fesettings->step_size = 0;
+        fesettings->max_drift = 0;
+
+        return 0;
+}
+
+static int ec100_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+        struct ec100_state *state = fe->demodulator_priv;
+        int ret;
+        u8 tmp;
+        *status = 0;
+
+        ret = ec100_read_reg(state, 0x42, &tmp);
+        if (ret)
+                goto error;
+
+        if (tmp & 0x80) {
+                /* bit7 set - have lock */
+                *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
+                        FE_HAS_SYNC | FE_HAS_LOCK;
+        } else {
+                ret = ec100_read_reg(state, 0x01, &tmp);
+                if (ret)
+                        goto error;
+
+                if (tmp & 0x10) {
+                        /* bit4 set - have signal */
+                        *status |= FE_HAS_SIGNAL;
+                        if (!(tmp & 0x01)) {
+                                /* bit0 clear - have ~valid signal */
+                                *status |= FE_HAS_CARRIER |  FE_HAS_VITERBI;
+                        }
+                }
+        }
+
+        return ret;
+error:
+        deb_info("%s: failed:%d\n", __func__, ret);
+        return ret;
+}
+
+static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+        struct ec100_state *state = fe->demodulator_priv;
+        int ret;
+        u8 tmp, tmp2;
+        u16 ber2;
+
+        *ber = 0;
+
+        ret = ec100_read_reg(state, 0x65, &tmp);
+        if (ret)
+                goto error;
+        ret = ec100_read_reg(state, 0x66, &tmp2);
+        if (ret)
+                goto error;
+
+        ber2 = (tmp2 << 8) | tmp;
+
+        /* if counter overflow or clear */
+        if (ber2 < state->ber)
+                *ber = ber2;
+        else
+                *ber = ber2 - state->ber;
+
+        state->ber = ber2;
+
+        return ret;
+error:
+        deb_info("%s: failed:%d\n", __func__, ret);
+        return ret;
+}
+
+static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
+{
+        struct ec100_state *state = fe->demodulator_priv;
+        int ret;
+        u8 tmp;
+
+        ret = ec100_read_reg(state, 0x24, &tmp);
+        if (ret) {
+                *strength = 0;
+                goto error;
+        }
+
+        *strength = ((tmp << 8) | tmp);
+
+        return ret;
+error:
+        deb_info("%s: failed:%d\n", __func__, ret);
+        return ret;
+}
+
+static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+        *snr = 0;
+        return 0;
+}
+
+static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+        *ucblocks = 0;
+        return 0;
+}
+
+static void ec100_release(struct dvb_frontend *fe)
+{
+        struct ec100_state *state = fe->demodulator_priv;
+        kfree(state);
+}
+
+static struct dvb_frontend_ops ec100_ops;
+
+struct dvb_frontend *ec100_attach(const struct ec100_config *config,
+        struct i2c_adapter *i2c)
+{
+        int ret;
+        struct ec100_state *state = NULL;
+        u8 tmp;
+
+        /* allocate memory for the internal state */
+        state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);
+        if (state == NULL)
+                goto error;
+
+        /* setup the state */
+        state->i2c = i2c;
+        memcpy(&state->config, config, sizeof(struct ec100_config));
+
+        /* check if the demod is there */
+        ret = ec100_read_reg(state, 0x33, &tmp);
+        if (ret || tmp != 0x0b)
+                goto error;
+
+        /* create dvb_frontend */
+        memcpy(&state->frontend.ops, &ec100_ops,
+                sizeof(struct dvb_frontend_ops));
+        state->frontend.demodulator_priv = state;
+
+        return &state->frontend;
+error:
+        kfree(state);
+        return NULL;
+}
+EXPORT_SYMBOL(ec100_attach);
+
+static struct dvb_frontend_ops ec100_ops = {
+        .info = {
+                .name = "E3C EC100 DVB-T",
+                .type = FE_OFDM,
+                .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_QAM_AUTO |
+                        FE_CAN_TRANSMISSION_MODE_AUTO |
+                        FE_CAN_GUARD_INTERVAL_AUTO |
+                        FE_CAN_HIERARCHY_AUTO |
+                        FE_CAN_MUTE_TS
+        },
+
+        .release = ec100_release,
+        .set_frontend = ec100_set_frontend,
+        .get_tune_settings = ec100_get_tune_settings,
+        .read_status = ec100_read_status,
+        .read_ber = ec100_read_ber,
+        .read_signal_strength = ec100_read_signal_strength,
+        .read_snr = ec100_read_snr,
+        .read_ucblocks = ec100_read_ucblocks,
+};
+
+MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
+MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/dvb/frontends/ec100.h b/drivers/media/dvb/frontends/ec100.h
new file mode 100644
index 000000000000..ee8e52417958
--- /dev/null
+++ b/drivers/media/dvb/frontends/ec100.h
@@ -0,0 +1,46 @@
+/*
+ * E3C EC100 demodulator driver
+ *
+ * Copyright (C) 2009 Antti Palosaari <crope@iki.fi>
+ *
+ *    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.
+ *
+ */
+
+#ifndef EC100_H
+#define EC100_H
+
+#include <linux/dvb/frontend.h>
+
+struct ec100_config {
+        /* demodulator's I2C address */
+        u8 demod_address;
+};
+
+
+#if defined(CONFIG_DVB_EC100) || \
+        (defined(CONFIG_DVB_EC100_MODULE) && defined(MODULE))
+extern struct dvb_frontend *ec100_attach(const struct ec100_config *config,
+        struct i2c_adapter *i2c);
+#else
+static inline struct dvb_frontend *ec100_attach(
+        const struct ec100_config *config, struct i2c_adapter *i2c)
+{
+        printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+        return NULL;
+}
+#endif
+
+#endif /* EC100_H */
diff --git a/drivers/media/dvb/frontends/ec100_priv.h b/drivers/media/dvb/frontends/ec100_priv.h
new file mode 100644
index 000000000000..5c990144bc47
--- /dev/null
+++ b/drivers/media/dvb/frontends/ec100_priv.h
@@ -0,0 +1,39 @@
+/*
+ * E3C EC100 demodulator driver
+ *
+ * Copyright (C) 2009 Antti Palosaari <crope@iki.fi>
+ *
+ *    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.
+ *
+ */
+
+#ifndef EC100_PRIV
+#define EC100_PRIV
+
+#define LOG_PREFIX "ec100"
+
+#define dprintk(var, level, args...) \
+        do { if ((var & level)) printk(args); } while (0)
+
+#define deb_info(args...) dprintk(ec100_debug, 0x01, args)
+
+#undef err
+#define err(f, arg...)  printk(KERN_ERR     LOG_PREFIX": " f "\n" , ## arg)
+#undef info
+#define info(f, arg...) printk(KERN_INFO    LOG_PREFIX": " f "\n" , ## arg)
+#undef warn
+#define warn(f, arg...) printk(KERN_WARNING LOG_PREFIX": " f "\n" , ## arg)
+
+#endif /* EC100_PRIV */