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authorAkihiro Tsukada <tskd08@gmail.com>2014-09-08 17:20:40 (GMT)
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2014-09-23 20:03:59 (GMT)
commitaff0c42a78ed2b6410a083dce59bb6c9fe85da27 (patch)
treebb02c55e40b14116945641846f51972c3ad5fd00
parent0f531e735651555568816b6cf7631816003dc1d2 (diff)
[media] mxl301rf: add driver for MaxLinear MxL301RF OFDM tuner
This patch adds driver for mxl301rf OFDM tuner chips. It is used as an ISDB-T tuner in earthsoft pt3 cards. Note that this driver does not initilize the chip, because the initilization sequence / register setting is not disclosed. Thus, the driver assumes that the chips are initilized externally by its parent board driver before tuner_ops->init() are called, like in PT3 driver where the bridge chip contains the init sequence in its private memory and provides a command to trigger the sequence. Signed-off-by: Akihiro Tsukada <tskd08@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
-rw-r--r--drivers/media/tuners/Kconfig7
-rw-r--r--drivers/media/tuners/Makefile1
-rw-r--r--drivers/media/tuners/mxl301rf.c349
-rw-r--r--drivers/media/tuners/mxl301rf.h26
4 files changed, 383 insertions, 0 deletions
diff --git a/drivers/media/tuners/Kconfig b/drivers/media/tuners/Kconfig
index 69a9fa5..b04356b 100644
--- a/drivers/media/tuners/Kconfig
+++ b/drivers/media/tuners/Kconfig
@@ -260,4 +260,11 @@ config MEDIA_TUNER_R820T
default m if !MEDIA_SUBDRV_AUTOSELECT
help
Rafael Micro R820T silicon tuner driver.
+
+config MEDIA_TUNER_MXL301RF
+ tristate "MaxLinear MxL301RF tuner"
+ depends on MEDIA_SUPPORT && I2C
+ default m if !MEDIA_SUBDRV_AUTOSELECT
+ help
+ MaxLinear MxL301RF OFDM tuner driver.
endmenu
diff --git a/drivers/media/tuners/Makefile b/drivers/media/tuners/Makefile
index 7eede5c..5c41a33 100644
--- a/drivers/media/tuners/Makefile
+++ b/drivers/media/tuners/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_MEDIA_TUNER_FC0012) += fc0012.o
obj-$(CONFIG_MEDIA_TUNER_FC0013) += fc0013.o
obj-$(CONFIG_MEDIA_TUNER_IT913X) += it913x.o
obj-$(CONFIG_MEDIA_TUNER_R820T) += r820t.o
+obj-$(CONFIG_MEDIA_TUNER_MXL301RF) += mxl301rf.o
ccflags-y += -I$(srctree)/drivers/media/dvb-core
ccflags-y += -I$(srctree)/drivers/media/dvb-frontends
diff --git a/drivers/media/tuners/mxl301rf.c b/drivers/media/tuners/mxl301rf.c
new file mode 100644
index 0000000..1575a5d
--- /dev/null
+++ b/drivers/media/tuners/mxl301rf.c
@@ -0,0 +1,349 @@
+/*
+ * MaxLinear MxL301RF OFDM tuner driver
+ *
+ * Copyright (C) 2014 Akihiro Tsukada <tskd08@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 version 2.
+ *
+ *
+ * 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.
+ */
+
+/*
+ * NOTICE:
+ * This driver is incomplete and lacks init/config of the chips,
+ * as the necessary info is not disclosed.
+ * Other features like get_if_frequency() are missing as well.
+ * It assumes that users of this driver (such as a PCI bridge of
+ * DTV receiver cards) properly init and configure the chip
+ * via I2C *before* calling this driver's init() function.
+ *
+ * Currently, PT3 driver is the only one that uses this driver,
+ * and contains init/config code in its firmware.
+ * Thus some part of the code might be dependent on PT3 specific config.
+ */
+
+#include <linux/kernel.h>
+#include "mxl301rf.h"
+
+struct mxl301rf_state {
+ struct mxl301rf_config cfg;
+ struct i2c_client *i2c;
+};
+
+static struct mxl301rf_state *cfg_to_state(struct mxl301rf_config *c)
+{
+ return container_of(c, struct mxl301rf_state, cfg);
+}
+
+static int raw_write(struct mxl301rf_state *state, const u8 *buf, int len)
+{
+ int ret;
+
+ ret = i2c_master_send(state->i2c, buf, len);
+ if (ret >= 0 && ret < len)
+ ret = -EIO;
+ return (ret == len) ? 0 : ret;
+}
+
+static int reg_write(struct mxl301rf_state *state, u8 reg, u8 val)
+{
+ u8 buf[2] = { reg, val };
+
+ return raw_write(state, buf, 2);
+}
+
+static int reg_read(struct mxl301rf_state *state, u8 reg, u8 *val)
+{
+ u8 wbuf[2] = { 0xfb, reg };
+ int ret;
+
+ ret = raw_write(state, wbuf, sizeof(wbuf));
+ if (ret == 0)
+ ret = i2c_master_recv(state->i2c, val, 1);
+ if (ret >= 0 && ret < 1)
+ ret = -EIO;
+ return (ret == 1) ? 0 : ret;
+}
+
+/* tuner_ops */
+
+/* get RSSI and update propery cache, set to *out in % */
+static int mxl301rf_get_rf_strength(struct dvb_frontend *fe, u16 *out)
+{
+ struct mxl301rf_state *state;
+ int ret;
+ u8 rf_in1, rf_in2, rf_off1, rf_off2;
+ u16 rf_in, rf_off;
+ s64 level;
+ struct dtv_fe_stats *rssi;
+
+ rssi = &fe->dtv_property_cache.strength;
+ rssi->len = 1;
+ rssi->stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ *out = 0;
+
+ state = fe->tuner_priv;
+ ret = reg_write(state, 0x14, 0x01);
+ if (ret < 0)
+ return ret;
+ usleep_range(1000, 2000);
+
+ ret = reg_read(state, 0x18, &rf_in1);
+ if (ret == 0)
+ ret = reg_read(state, 0x19, &rf_in2);
+ if (ret == 0)
+ ret = reg_read(state, 0xd6, &rf_off1);
+ if (ret == 0)
+ ret = reg_read(state, 0xd7, &rf_off2);
+ if (ret != 0)
+ return ret;
+
+ rf_in = (rf_in2 & 0x07) << 8 | rf_in1;
+ rf_off = (rf_off2 & 0x0f) << 5 | (rf_off1 >> 3);
+ level = rf_in - rf_off - (113 << 3); /* x8 dBm */
+ level = level * 1000 / 8;
+ rssi->stat[0].svalue = level;
+ rssi->stat[0].scale = FE_SCALE_DECIBEL;
+ /* *out = (level - min) * 100 / (max - min) */
+ *out = (rf_in - rf_off + (1 << 9) - 1) * 100 / ((5 << 9) - 2);
+ return 0;
+}
+
+/* spur shift parameters */
+struct shf {
+ u32 freq; /* Channel center frequency */
+ u32 ofst_th; /* Offset frequency threshold */
+ u8 shf_val; /* Spur shift value */
+ u8 shf_dir; /* Spur shift direction */
+};
+
+static const struct shf shf_tab[] = {
+ { 64500, 500, 0x92, 0x07 },
+ { 191500, 300, 0xe2, 0x07 },
+ { 205500, 500, 0x2c, 0x04 },
+ { 212500, 500, 0x1e, 0x04 },
+ { 226500, 500, 0xd4, 0x07 },
+ { 99143, 500, 0x9c, 0x07 },
+ { 173143, 500, 0xd4, 0x07 },
+ { 191143, 300, 0xd4, 0x07 },
+ { 207143, 500, 0xce, 0x07 },
+ { 225143, 500, 0xce, 0x07 },
+ { 243143, 500, 0xd4, 0x07 },
+ { 261143, 500, 0xd4, 0x07 },
+ { 291143, 500, 0xd4, 0x07 },
+ { 339143, 500, 0x2c, 0x04 },
+ { 117143, 500, 0x7a, 0x07 },
+ { 135143, 300, 0x7a, 0x07 },
+ { 153143, 500, 0x01, 0x07 }
+};
+
+struct reg_val {
+ u8 reg;
+ u8 val;
+} __attribute__ ((__packed__));
+
+static const struct reg_val set_idac[] = {
+ { 0x0d, 0x00 },
+ { 0x0c, 0x67 },
+ { 0x6f, 0x89 },
+ { 0x70, 0x0c },
+ { 0x6f, 0x8a },
+ { 0x70, 0x0e },
+ { 0x6f, 0x8b },
+ { 0x70, 0x1c },
+};
+
+static int mxl301rf_set_params(struct dvb_frontend *fe)
+{
+ struct reg_val tune0[] = {
+ { 0x13, 0x00 }, /* abort tuning */
+ { 0x3b, 0xc0 },
+ { 0x3b, 0x80 },
+ { 0x10, 0x95 }, /* BW */
+ { 0x1a, 0x05 },
+ { 0x61, 0x00 }, /* spur shift value (placeholder) */
+ { 0x62, 0xa0 } /* spur shift direction (placeholder) */
+ };
+
+ struct reg_val tune1[] = {
+ { 0x11, 0x40 }, /* RF frequency L (placeholder) */
+ { 0x12, 0x0e }, /* RF frequency H (placeholder) */
+ { 0x13, 0x01 } /* start tune */
+ };
+
+ struct mxl301rf_state *state;
+ u32 freq;
+ u16 f;
+ u32 tmp, div;
+ int i, ret;
+
+ state = fe->tuner_priv;
+ freq = fe->dtv_property_cache.frequency;
+
+ /* spur shift function (for analog) */
+ for (i = 0; i < ARRAY_SIZE(shf_tab); i++) {
+ if (freq >= (shf_tab[i].freq - shf_tab[i].ofst_th) * 1000 &&
+ freq <= (shf_tab[i].freq + shf_tab[i].ofst_th) * 1000) {
+ tune0[5].val = shf_tab[i].shf_val;
+ tune0[6].val = 0xa0 | shf_tab[i].shf_dir;
+ break;
+ }
+ }
+ ret = raw_write(state, (u8 *) tune0, sizeof(tune0));
+ if (ret < 0)
+ goto failed;
+ usleep_range(3000, 4000);
+
+ /* convert freq to 10.6 fixed point float [MHz] */
+ f = freq / 1000000;
+ tmp = freq % 1000000;
+ div = 1000000;
+ for (i = 0; i < 6; i++) {
+ f <<= 1;
+ div >>= 1;
+ if (tmp > div) {
+ tmp -= div;
+ f |= 1;
+ }
+ }
+ if (tmp > 7812)
+ f++;
+ tune1[0].val = f & 0xff;
+ tune1[1].val = f >> 8;
+ ret = raw_write(state, (u8 *) tune1, sizeof(tune1));
+ if (ret < 0)
+ goto failed;
+ msleep(31);
+
+ ret = reg_write(state, 0x1a, 0x0d);
+ if (ret < 0)
+ goto failed;
+ ret = raw_write(state, (u8 *) set_idac, sizeof(set_idac));
+ if (ret < 0)
+ goto failed;
+ return 0;
+
+failed:
+ dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
+ __func__, fe->dvb->num, fe->id);
+ return ret;
+}
+
+static const struct reg_val standby_data[] = {
+ { 0x01, 0x00 },
+ { 0x13, 0x00 }
+};
+
+static int mxl301rf_sleep(struct dvb_frontend *fe)
+{
+ struct mxl301rf_state *state;
+ int ret;
+
+ state = fe->tuner_priv;
+ ret = raw_write(state, (u8 *)standby_data, sizeof(standby_data));
+ if (ret < 0)
+ dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
+ __func__, fe->dvb->num, fe->id);
+ return ret;
+}
+
+
+/* init sequence is not public.
+ * the parent must have init'ed the device.
+ * just wake up here.
+ */
+static int mxl301rf_init(struct dvb_frontend *fe)
+{
+ struct mxl301rf_state *state;
+ int ret;
+
+ state = fe->tuner_priv;
+
+ ret = reg_write(state, 0x01, 0x01);
+ if (ret < 0) {
+ dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
+ __func__, fe->dvb->num, fe->id);
+ return ret;
+ }
+ return 0;
+}
+
+/* I2C driver functions */
+
+static const struct dvb_tuner_ops mxl301rf_ops = {
+ .info = {
+ .name = "MaxLinear MxL301RF",
+
+ .frequency_min = 93000000,
+ .frequency_max = 803142857,
+ },
+
+ .init = mxl301rf_init,
+ .sleep = mxl301rf_sleep,
+
+ .set_params = mxl301rf_set_params,
+ .get_rf_strength = mxl301rf_get_rf_strength,
+};
+
+
+static int mxl301rf_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct mxl301rf_state *state;
+ struct mxl301rf_config *cfg;
+ struct dvb_frontend *fe;
+
+ state = kzalloc(sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+
+ state->i2c = client;
+ cfg = client->dev.platform_data;
+
+ memcpy(&state->cfg, cfg, sizeof(state->cfg));
+ fe = cfg->fe;
+ fe->tuner_priv = state;
+ memcpy(&fe->ops.tuner_ops, &mxl301rf_ops, sizeof(mxl301rf_ops));
+
+ i2c_set_clientdata(client, &state->cfg);
+ dev_info(&client->dev, "MaxLinear MxL301RF attached.\n");
+ return 0;
+}
+
+static int mxl301rf_remove(struct i2c_client *client)
+{
+ struct mxl301rf_state *state;
+
+ state = cfg_to_state(i2c_get_clientdata(client));
+ state->cfg.fe->tuner_priv = NULL;
+ kfree(state);
+ return 0;
+}
+
+
+static const struct i2c_device_id mxl301rf_id[] = {
+ {"mxl301rf", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, mxl301rf_id);
+
+static struct i2c_driver mxl301rf_driver = {
+ .driver = {
+ .name = "mxl301rf",
+ },
+ .probe = mxl301rf_probe,
+ .remove = mxl301rf_remove,
+ .id_table = mxl301rf_id,
+};
+
+module_i2c_driver(mxl301rf_driver);
+
+MODULE_DESCRIPTION("MaxLinear MXL301RF tuner");
+MODULE_AUTHOR("Akihiro TSUKADA");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/tuners/mxl301rf.h b/drivers/media/tuners/mxl301rf.h
new file mode 100644
index 0000000..19e6840
--- /dev/null
+++ b/drivers/media/tuners/mxl301rf.h
@@ -0,0 +1,26 @@
+/*
+ * MaxLinear MxL301RF OFDM tuner driver
+ *
+ * Copyright (C) 2014 Akihiro Tsukada <tskd08@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 version 2.
+ *
+ *
+ * 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.
+ */
+
+#ifndef MXL301RF_H
+#define MXL301RF_H
+
+#include "dvb_frontend.h"
+
+struct mxl301rf_config {
+ struct dvb_frontend *fe;
+};
+
+#endif /* MXL301RF_H */

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