[PATCH v3] media: dvb-frontends: add Socionext SC1501A ISDB-S/T demodulator driver

From: Katsuhiro Suzuki
Date: Wed Jun 20 2018 - 23:17:57 EST

This patch adds a frontend driver for the Socionext SC1501A series
and Socionext MN88443x ISDB-S/T demodulators.

The maximum and minimum frequency of Socionext SC1501A comes from
ISDB-S and ISDB-T so frequency range is the following:
- ISDB-S (BS/CS110 IF frequency in kHz, Local freq 10.678GHz)
- Min: BS-1: 1032000 => 1032.23MHz
- Max: ND24: 2701000 => 2070.25MHz
- ISDB-T (in Hz)
- Min: ch13: 470000000 => 470.357857MHz
- Max: ch62: 770000000 => 769.927857MHz

Signed-off-by: Katsuhiro Suzuki <suzuki.katsuhiro@xxxxxxxxxxxxx>

---

Changes since v2:
- Fix frequency max and min

Changes since v1:
- Fix sparse warning about type of constant
- Use div_s64() instead of divide operator
---
drivers/media/dvb-frontends/Kconfig | 10 +
drivers/media/dvb-frontends/Makefile | 1 +
drivers/media/dvb-frontends/sc1501a.c | 802 ++++++++++++++++++++++++++
drivers/media/dvb-frontends/sc1501a.h | 27 +
4 files changed, 840 insertions(+)
create mode 100644 drivers/media/dvb-frontends/sc1501a.c
create mode 100644 drivers/media/dvb-frontends/sc1501a.h

diff --git a/drivers/media/dvb-frontends/Kconfig b/drivers/media/dvb-frontends/Kconfig
index 9ecaa9d0744a..097ae3c834f2 100644
--- a/drivers/media/dvb-frontends/Kconfig
+++ b/drivers/media/dvb-frontends/Kconfig
@@ -739,6 +739,16 @@ config DVB_TC90522
Toshiba TC90522 2xISDB-S 8PSK + 2xISDB-T OFDM demodulator.
Say Y when you want to support this frontend.

+config DVB_SC1501A
+ tristate "Socionext SC1501A"
+ depends on DVB_CORE && I2C
+ select REGMAP_I2C
+ default m if !MEDIA_SUBDRV_AUTOSELECT
+ help
+ A driver for Socionext SC1501A and Panasonic MN88443x
+ ISDB-S + ISDB-T demodulator.
+ Say Y when you want to support this frontend.
+
comment "Digital terrestrial only tuners/PLL"
depends on DVB_CORE

diff --git a/drivers/media/dvb-frontends/Makefile b/drivers/media/dvb-frontends/Makefile
index 67a783fd5ed0..e204502347ed 100644
--- a/drivers/media/dvb-frontends/Makefile
+++ b/drivers/media/dvb-frontends/Makefile
@@ -125,6 +125,7 @@ obj-$(CONFIG_DVB_AF9033) += af9033.o
obj-$(CONFIG_DVB_AS102_FE) += as102_fe.o
obj-$(CONFIG_DVB_GP8PSK_FE) += gp8psk-fe.o
obj-$(CONFIG_DVB_TC90522) += tc90522.o
+obj-$(CONFIG_DVB_SC1501A) += sc1501a.o
obj-$(CONFIG_DVB_HORUS3A) += horus3a.o
obj-$(CONFIG_DVB_ASCOT2E) += ascot2e.o
obj-$(CONFIG_DVB_HELENE) += helene.o
diff --git a/drivers/media/dvb-frontends/sc1501a.c b/drivers/media/dvb-frontends/sc1501a.c
new file mode 100644
index 000000000000..705529007abe
--- /dev/null
+++ b/drivers/media/dvb-frontends/sc1501a.c
@@ -0,0 +1,802 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Socionext SC1501A series demodulator driver for ISDB-S/ISDB-T.
+//
+// Copyright (c) 2018 Socionext Inc.
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <media/dvb_math.h>
+
+#include "sc1501a.h"
+
+/* ISDB-S registers */
+#define ATSIDU_S 0x2f
+#define ATSIDL_S 0x30
+#define TSSET_S 0x31
+#define AGCREAD_S 0x5a
+#define CPMON1_S 0x5e
+#define CPMON1_S_FSYNC BIT(5)
+#define CPMON1_S_ERRMON BIT(4)
+#define CPMON1_S_SIGOFF BIT(3)
+#define CPMON1_S_W2LOCK BIT(2)
+#define CPMON1_S_W1LOCK BIT(1)
+#define CPMON1_S_DW1LOCK BIT(0)
+#define TRMON_S 0x60
+#define BERCNFLG_S 0x68
+#define BERCNFLG_S_BERVRDY BIT(5)
+#define BERCNFLG_S_BERVCHK BIT(4)
+#define BERCNFLG_S_BERDRDY BIT(3)
+#define BERCNFLG_S_BERDCHK BIT(2)
+#define CNRDXU_S 0x69
+#define CNRDXL_S 0x6a
+#define CNRDYU_S 0x6b
+#define CNRDYL_S 0x6c
+#define BERVRDU_S 0x71
+#define BERVRDL_S 0x72
+#define DOSET1_S 0x73
+
+/* Primary ISDB-T */
+#define PLLASET1 0x00
+#define PLLASET2 0x01
+#define PLLBSET1 0x02
+#define PLLBSET2 0x03
+#define PLLSET 0x04
+#define OUTCSET 0x08
+#define OUTCSET_CHDRV_8MA 0xff
+#define OUTCSET_CHDRV_4MA 0x00
+#define PLDWSET 0x09
+#define PLDWSET_NORMAL 0x00
+#define PLDWSET_PULLDOWN 0xff
+#define HIZSET1 0x0a
+#define HIZSET2 0x0b
+
+/* Secondary ISDB-T (for MN884434 only) */
+#define RCVSET 0x00
+#define TSSET1_M 0x01
+#define TSSET2_M 0x02
+#define TSSET3_M 0x03
+#define INTACSET 0x08
+#define HIZSET3 0x0b
+
+/* ISDB-T registers */
+#define TSSET1 0x05
+#define TSSET1_TSASEL_MASK GENMASK(4, 3)
+#define TSSET1_TSASEL_ISDBT (0x0 << 3)
+#define TSSET1_TSASEL_ISDBS (0x1 << 3)
+#define TSSET1_TSASEL_NONE (0x2 << 3)
+#define TSSET1_TSBSEL_MASK GENMASK(2, 1)
+#define TSSET1_TSBSEL_ISDBS (0x0 << 1)
+#define TSSET1_TSBSEL_ISDBT (0x1 << 1)
+#define TSSET1_TSBSEL_NONE (0x2 << 1)
+#define TSSET2 0x06
+#define TSSET3 0x07
+#define TSSET3_INTASEL_MASK GENMASK(7, 6)
+#define TSSET3_INTASEL_T (0x0 << 6)
+#define TSSET3_INTASEL_S (0x1 << 6)
+#define TSSET3_INTASEL_NONE (0x2 << 6)
+#define TSSET3_INTBSEL_MASK GENMASK(5, 4)
+#define TSSET3_INTBSEL_S (0x0 << 4)
+#define TSSET3_INTBSEL_T (0x1 << 4)
+#define TSSET3_INTBSEL_NONE (0x2 << 4)
+#define OUTSET2 0x0d
+#define PWDSET 0x0f
+#define PWDSET_OFDMPD_MASK GENMASK(3, 2)
+#define PWDSET_OFDMPD_DOWN BIT(3)
+#define PWDSET_PSKPD_MASK GENMASK(1, 0)
+#define PWDSET_PSKPD_DOWN BIT(1)
+#define CLKSET1_T 0x11
+#define MDSET_T 0x13
+#define MDSET_T_MDAUTO_MASK GENMASK(7, 4)
+#define MDSET_T_MDAUTO_AUTO (0xf << 4)
+#define MDSET_T_MDAUTO_MANUAL (0x0 << 4)
+#define MDSET_T_FFTS_MASK GENMASK(3, 2)
+#define MDSET_T_FFTS_MODE1 (0x0 << 2)
+#define MDSET_T_FFTS_MODE2 (0x1 << 2)
+#define MDSET_T_FFTS_MODE3 (0x2 << 2)
+#define MDSET_T_GI_MASK GENMASK(1, 0)
+#define MDSET_T_GI_1_32 (0x0 << 0)
+#define MDSET_T_GI_1_16 (0x1 << 0)
+#define MDSET_T_GI_1_8 (0x2 << 0)
+#define MDSET_T_GI_1_4 (0x3 << 0)
+#define MDASET_T 0x14
+#define ADCSET1_T 0x20
+#define ADCSET1_T_REFSEL_MASK GENMASK(1, 0)
+#define ADCSET1_T_REFSEL_2V (0x3 << 0)
+#define ADCSET1_T_REFSEL_1_5V (0x2 << 0)
+#define ADCSET1_T_REFSEL_1V (0x1 << 0)
+#define NCOFREQU_T 0x24
+#define NCOFREQM_T 0x25
+#define NCOFREQL_T 0x26
+#define FADU_T 0x27
+#define FADM_T 0x28
+#define FADL_T 0x29
+#define AGCSET2_T 0x2c
+#define AGCSET2_T_IFPOLINV_INC BIT(0)
+#define AGCSET2_T_RFPOLINV_INC BIT(1)
+#define AGCV3_T 0x3e
+#define MDRD_T 0xa2
+#define MDRD_T_SEGID_MASK GENMASK(5, 4)
+#define MDRD_T_SEGID_13 (0x0 << 4)
+#define MDRD_T_SEGID_1 (0x1 << 4)
+#define MDRD_T_SEGID_3 (0x2 << 4)
+#define MDRD_T_FFTS_MASK GENMASK(3, 2)
+#define MDRD_T_FFTS_MODE1 (0x0 << 2)
+#define MDRD_T_FFTS_MODE2 (0x1 << 2)
+#define MDRD_T_FFTS_MODE3 (0x2 << 2)
+#define MDRD_T_GI_MASK GENMASK(1, 0)
+#define MDRD_T_GI_1_32 (0x0 << 0)
+#define MDRD_T_GI_1_16 (0x1 << 0)
+#define MDRD_T_GI_1_8 (0x2 << 0)
+#define MDRD_T_GI_1_4 (0x3 << 0)
+#define SSEQRD_T 0xa3
+#define SSEQRD_T_SSEQSTRD_MASK GENMASK(3, 0)
+#define SSEQRD_T_SSEQSTRD_RESET (0x0 << 0)
+#define SSEQRD_T_SSEQSTRD_TUNING (0x1 << 0)
+#define SSEQRD_T_SSEQSTRD_AGC (0x2 << 0)
+#define SSEQRD_T_SSEQSTRD_SEARCH (0x3 << 0)
+#define SSEQRD_T_SSEQSTRD_CLOCK_SYNC (0x4 << 0)
+#define SSEQRD_T_SSEQSTRD_FREQ_SYNC (0x8 << 0)
+#define SSEQRD_T_SSEQSTRD_FRAME_SYNC (0x9 << 0)
+#define SSEQRD_T_SSEQSTRD_SYNC (0xa << 0)
+#define SSEQRD_T_SSEQSTRD_LOCK (0xb << 0)
+#define AGCRDU_T 0xa8
+#define AGCRDL_T 0xa9
+#define CNRDU_T 0xbe
+#define CNRDL_T 0xbf
+#define BERFLG_T 0xc0
+#define BERFLG_T_BERDRDY BIT(7)
+#define BERFLG_T_BERDCHK BIT(6)
+#define BERFLG_T_BERVRDYA BIT(5)
+#define BERFLG_T_BERVCHKA BIT(4)
+#define BERFLG_T_BERVRDYB BIT(3)
+#define BERFLG_T_BERVCHKB BIT(2)
+#define BERFLG_T_BERVRDYC BIT(1)
+#define BERFLG_T_BERVCHKC BIT(0)
+#define BERRDU_T 0xc1
+#define BERRDM_T 0xc2
+#define BERRDL_T 0xc3
+#define BERLENRDU_T 0xc4
+#define BERLENRDL_T 0xc5
+#define ERRFLG_T 0xc6
+#define ERRFLG_T_BERDOVF BIT(7)
+#define ERRFLG_T_BERVOVFA BIT(6)
+#define ERRFLG_T_BERVOVFB BIT(5)
+#define ERRFLG_T_BERVOVFC BIT(4)
+#define ERRFLG_T_NERRFA BIT(3)
+#define ERRFLG_T_NERRFB BIT(2)
+#define ERRFLG_T_NERRFC BIT(1)
+#define ERRFLG_T_NERRF BIT(0)
+#define DOSET1_T 0xcf
+
+#define CLK_LOW 4000000
+#define CLK_DIRECT 20200000
+#define CLK_MAX 25410000
+
+#define S_T_FREQ 8126984 /* 512 / 63 MHz */
+
+struct sc1501a_spec {
+ bool primary;
+};
+
+struct sc1501a_priv {
+ const struct sc1501a_spec *spec;
+
+ struct dvb_frontend fe;
+ struct clk *mclk;
+ struct gpio_desc *reset_gpio;
+ u32 clk_freq;
+ u32 if_freq;
+
+ /* Common */
+ bool use_clkbuf;
+
+ /* ISDB-S */
+ struct i2c_client *client_s;
+ struct regmap *regmap_s;
+
+ /* ISDB-T */
+ struct i2c_client *client_t;
+ struct regmap *regmap_t;
+};
+
+static void sc1501a_cmn_power_on(struct sc1501a_priv *chip)
+{
+ struct regmap *r_t = chip->regmap_t;
+
+ clk_prepare_enable(chip->mclk);
+
+ gpiod_set_value_cansleep(chip->reset_gpio, 1);
+ usleep_range(100, 1000);
+ gpiod_set_value_cansleep(chip->reset_gpio, 0);
+
+ if (chip->spec->primary) {
+ regmap_write(r_t, OUTCSET, OUTCSET_CHDRV_8MA);
+ regmap_write(r_t, PLDWSET, PLDWSET_NORMAL);
+ regmap_write(r_t, HIZSET1, 0x80);
+ regmap_write(r_t, HIZSET2, 0xe0);
+ } else {
+ regmap_write(r_t, HIZSET3, 0x8f);
+ }
+}
+
+static void sc1501a_cmn_power_off(struct sc1501a_priv *chip)
+{
+ gpiod_set_value_cansleep(chip->reset_gpio, 1);
+
+ clk_disable_unprepare(chip->mclk);
+}
+
+static void sc1501a_s_sleep(struct sc1501a_priv *chip)
+{
+ struct regmap *r_t = chip->regmap_t;
+
+ regmap_update_bits(r_t, PWDSET, PWDSET_PSKPD_MASK,
+ PWDSET_PSKPD_DOWN);
+}
+
+static void sc1501a_s_wake(struct sc1501a_priv *chip)
+{
+ struct regmap *r_t = chip->regmap_t;
+
+ regmap_update_bits(r_t, PWDSET, PWDSET_PSKPD_MASK, 0);
+}
+
+static void sc1501a_s_tune(struct sc1501a_priv *chip,
+ struct dtv_frontend_properties *c)
+{
+ struct regmap *r_s = chip->regmap_s;
+
+ regmap_write(r_s, ATSIDU_S, c->stream_id >> 8);
+ regmap_write(r_s, ATSIDL_S, c->stream_id);
+ regmap_write(r_s, TSSET_S, 0);
+}
+
+static int sc1501a_s_read_status(struct sc1501a_priv *chip,
+ struct dtv_frontend_properties *c,
+ enum fe_status *status)
+{
+ struct regmap *r_s = chip->regmap_s;
+ u32 cpmon, tmpu, tmpl, flg;
+ u64 tmp;
+
+ /* Sync detection */
+ regmap_read(r_s, CPMON1_S, &cpmon);
+
+ *status = 0;
+ if (cpmon & CPMON1_S_FSYNC)
+ *status |= FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
+ if (cpmon & CPMON1_S_W2LOCK)
+ *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
+
+ /* Signal strength */
+ c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
+ if (*status & FE_HAS_SIGNAL) {
+ u32 agc;
+
+ regmap_read(r_s, AGCREAD_S, &tmpu);
+ agc = tmpu << 8;
+
+ c->strength.len = 1;
+ c->strength.stat[0].scale = FE_SCALE_RELATIVE;
+ c->strength.stat[0].uvalue = agc;
+ }
+
+ /* C/N rate */
+ c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
+ if (*status & FE_HAS_VITERBI) {
+ u32 cnr = 0, x, y, d;
+ u64 d_3 = 0;
+
+ regmap_read(r_s, CNRDXU_S, &tmpu);
+ regmap_read(r_s, CNRDXL_S, &tmpl);
+ x = (tmpu << 8) | tmpl;
+ regmap_read(r_s, CNRDYU_S, &tmpu);
+ regmap_read(r_s, CNRDYL_S, &tmpl);
+ y = (tmpu << 8) | tmpl;
+
+ /* CNR[dB]: 10 * log10(D) - 30.74 / D^3 - 3 */
+ /* D = x^2 / (2^15 * y - x^2) */
+ d = (y << 15) - x * x;
+ if (d > 0) {
+ /* (2^4 * D)^3 = 2^12 * D^3 */
+ /* 3.074 * 2^(12 + 24) = 211243671486 */
+ d_3 = div_u64(16 * x * x, d);
+ d_3 = d_3 * d_3 * d_3;
+ if (d_3)
+ d_3 = div_u64(211243671486ULL, d_3);
+ }
+
+ if (d_3) {
+ /* 0.3 * 2^24 = 5033164 */
+ tmp = (s64)2 * intlog10(x) - intlog10(abs(d)) - d_3
+ - 5033164;
+ cnr = div_u64(tmp * 10000, 1 << 24);
+ }
+
+ if (cnr) {
+ c->cnr.len = 1;
+ c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+ c->cnr.stat[0].uvalue = cnr;
+ }
+ }
+
+ /* BER */
+ c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
+ regmap_read(r_s, BERCNFLG_S, &flg);
+
+ if ((*status & FE_HAS_VITERBI) && (flg & BERCNFLG_S_BERVRDY)) {
+ u32 bit_err, bit_cnt;
+
+ regmap_read(r_s, BERVRDU_S, &tmpu);
+ regmap_read(r_s, BERVRDL_S, &tmpl);
+ bit_err = (tmpu << 8) | tmpl;
+ bit_cnt = (1 << 13) * 204;
+
+ if (bit_cnt) {
+ c->post_bit_error.len = 1;
+ c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+ c->post_bit_error.stat[0].uvalue = bit_err;
+ c->post_bit_count.len = 1;
+ c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
+ c->post_bit_count.stat[0].uvalue = bit_cnt;
+ }
+ }
+
+ return 0;
+}
+
+static void sc1501a_t_sleep(struct sc1501a_priv *chip)
+{
+ struct regmap *r_t = chip->regmap_t;
+
+ regmap_update_bits(r_t, PWDSET, PWDSET_OFDMPD_MASK,
+ PWDSET_OFDMPD_DOWN);
+}
+
+static void sc1501a_t_wake(struct sc1501a_priv *chip)
+{
+ struct regmap *r_t = chip->regmap_t;
+
+ regmap_update_bits(r_t, PWDSET, PWDSET_OFDMPD_MASK, 0);
+}
+
+static bool sc1501a_t_is_valid_clk(u32 adckt, u32 if_freq)
+{
+ if (if_freq == DIRECT_IF_57MHZ) {
+ if (adckt >= CLK_DIRECT && adckt <= 21000000)
+ return true;
+ if (adckt >= 25300000 && adckt <= CLK_MAX)
+ return true;
+ } else if (if_freq == DIRECT_IF_44MHZ) {
+ if (adckt >= 25000000 && adckt <= CLK_MAX)
+ return true;
+ } else if (if_freq >= LOW_IF_4MHZ && if_freq < DIRECT_IF_44MHZ) {
+ if (adckt >= CLK_DIRECT && adckt <= CLK_MAX)
+ return true;
+ }
+
+ return false;
+}
+
+static int sc1501a_t_set_freq(struct sc1501a_priv *chip)
+{
+ struct device *dev = &chip->client_s->dev;
+ struct regmap *r_t = chip->regmap_t;
+ s64 adckt, nco, ad_t;
+ u32 m, v;
+
+ /* Clock buffer (but not supported) or XTAL */
+ if (chip->clk_freq >= CLK_LOW && chip->clk_freq < CLK_DIRECT) {
+ chip->use_clkbuf = true;
+ regmap_write(r_t, CLKSET1_T, 0x07);
+
+ adckt = 0;
+ } else {
+ chip->use_clkbuf = false;
+ regmap_write(r_t, CLKSET1_T, 0x00);
+
+ adckt = chip->clk_freq;
+ }
+ if (!sc1501a_t_is_valid_clk(adckt, chip->if_freq)) {
+ dev_err(dev, "Invalid clock, CLK:%d, ADCKT:%lld, IF:%d\n",
+ chip->clk_freq, adckt, chip->if_freq);
+ return -EINVAL;
+ }
+
+ /* Direct IF or Low IF */
+ if (chip->if_freq == DIRECT_IF_57MHZ ||
+ chip->if_freq == DIRECT_IF_44MHZ)
+ nco = adckt * 2 - chip->if_freq;
+ else
+ nco = -((s64)chip->if_freq);
+ nco = div_s64(nco << 24, adckt);
+ ad_t = div_s64(adckt << 22, S_T_FREQ);
+
+ regmap_write(r_t, NCOFREQU_T, nco >> 16);
+ regmap_write(r_t, NCOFREQM_T, nco >> 8);
+ regmap_write(r_t, NCOFREQL_T, nco);
+ regmap_write(r_t, FADU_T, ad_t >> 16);
+ regmap_write(r_t, FADM_T, ad_t >> 8);
+ regmap_write(r_t, FADL_T, ad_t);
+
+ /* Level of IF */
+ m = ADCSET1_T_REFSEL_MASK;
+ v = ADCSET1_T_REFSEL_1_5V;
+ regmap_update_bits(r_t, ADCSET1_T, m, v);
+
+ /* Polarity of AGC */
+ v = AGCSET2_T_IFPOLINV_INC | AGCSET2_T_RFPOLINV_INC;
+ regmap_update_bits(r_t, AGCSET2_T, v, v);
+
+ /* Lower output level of AGC */
+ regmap_write(r_t, AGCV3_T, 0x00);
+
+ regmap_write(r_t, MDSET_T, 0xfa);
+
+ return 0;
+}
+
+static void sc1501a_t_tune(struct sc1501a_priv *chip,
+ struct dtv_frontend_properties *c)
+{
+ struct regmap *r_t = chip->regmap_t;
+ u32 m, v;
+
+ m = MDSET_T_MDAUTO_MASK | MDSET_T_FFTS_MASK | MDSET_T_GI_MASK;
+ v = MDSET_T_MDAUTO_AUTO | MDSET_T_FFTS_MODE3 | MDSET_T_GI_1_8;
+ regmap_update_bits(r_t, MDSET_T, m, v);
+
+ regmap_write(r_t, MDASET_T, 0);
+}
+
+static int sc1501a_t_read_status(struct sc1501a_priv *chip,
+ struct dtv_frontend_properties *c,
+ enum fe_status *status)
+{
+ struct regmap *r_t = chip->regmap_t;
+ u32 seqrd, st, flg, tmpu, tmpm, tmpl;
+ u64 tmp;
+
+ /* Sync detection */
+ regmap_read(r_t, SSEQRD_T, &seqrd);
+ st = seqrd & SSEQRD_T_SSEQSTRD_MASK;
+
+ *status = 0;
+ if (st >= SSEQRD_T_SSEQSTRD_SYNC)
+ *status |= FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
+ if (st >= SSEQRD_T_SSEQSTRD_FRAME_SYNC)
+ *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
+
+ /* Signal strength */
+ c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
+ if (*status & FE_HAS_SIGNAL) {
+ u32 agc;
+
+ regmap_read(r_t, AGCRDU_T, &tmpu);
+ regmap_read(r_t, AGCRDL_T, &tmpl);
+ agc = (tmpu << 8) | tmpl;
+
+ c->strength.len = 1;
+ c->strength.stat[0].scale = FE_SCALE_RELATIVE;
+ c->strength.stat[0].uvalue = agc;
+ }
+
+ /* C/N rate */
+ c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
+ if (*status & FE_HAS_VITERBI) {
+ u32 cnr;
+
+ regmap_read(r_t, CNRDU_T, &tmpu);
+ regmap_read(r_t, CNRDL_T, &tmpl);
+
+ if (tmpu || tmpl) {
+ /* CNR[dB]: 10 * (log10(65536 / value) + 0.2) */
+ /* intlog10(65536) = 80807124, 0.2 * 2^24 = 3355443 */
+ tmp = (u64)80807124 - intlog10((tmpu << 8) | tmpl)
+ + 3355443;
+ cnr = div_u64(tmp * 10000, 1 << 24);
+ } else {
+ cnr = 0;
+ }
+
+ c->cnr.len = 1;
+ c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+ c->cnr.stat[0].uvalue = cnr;
+ }
+
+ /* BER */
+ c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
+ regmap_read(r_t, BERFLG_T, &flg);
+
+ if ((*status & FE_HAS_VITERBI) && (flg & BERFLG_T_BERVRDYA)) {
+ u32 bit_err, bit_cnt;
+
+ regmap_read(r_t, BERRDU_T, &tmpu);
+ regmap_read(r_t, BERRDM_T, &tmpm);
+ regmap_read(r_t, BERRDL_T, &tmpl);
+ bit_err = (tmpu << 16) | (tmpm << 8) | tmpl;
+
+ regmap_read(r_t, BERLENRDU_T, &tmpu);
+ regmap_read(r_t, BERLENRDL_T, &tmpl);
+ bit_cnt = ((tmpu << 8) | tmpl) * 203 * 8;
+
+ if (bit_cnt) {
+ c->post_bit_error.len = 1;
+ c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+ c->post_bit_error.stat[0].uvalue = bit_err;
+ c->post_bit_count.len = 1;
+ c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
+ c->post_bit_count.stat[0].uvalue = bit_cnt;
+ }
+ }
+
+ return 0;
+}
+
+static int sc1501a_sleep(struct dvb_frontend *fe)
+{
+ struct sc1501a_priv *chip = fe->demodulator_priv;
+
+ sc1501a_s_sleep(chip);
+ sc1501a_t_sleep(chip);
+
+ return 0;
+}
+
+static int sc1501a_set_frontend(struct dvb_frontend *fe)
+{
+ struct sc1501a_priv *chip = fe->demodulator_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct regmap *r_s = chip->regmap_s;
+ struct regmap *r_t = chip->regmap_t;
+ u8 tssel = 0, intsel = 0;
+
+ if (c->delivery_system == SYS_ISDBS) {
+ sc1501a_s_wake(chip);
+ sc1501a_t_sleep(chip);
+
+ tssel = TSSET1_TSASEL_ISDBS;
+ intsel = TSSET3_INTASEL_S;
+ } else if (c->delivery_system == SYS_ISDBT) {
+ sc1501a_s_sleep(chip);
+ sc1501a_t_wake(chip);
+
+ sc1501a_t_set_freq(chip);
+
+ tssel = TSSET1_TSASEL_ISDBT;
+ intsel = TSSET3_INTASEL_T;
+ }
+
+ regmap_update_bits(r_t, TSSET1,
+ TSSET1_TSASEL_MASK | TSSET1_TSBSEL_MASK,
+ tssel | TSSET1_TSBSEL_NONE);
+ regmap_write(r_t, TSSET2, 0);
+ regmap_update_bits(r_t, TSSET3,
+ TSSET3_INTASEL_MASK | TSSET3_INTBSEL_MASK,
+ intsel | TSSET3_INTBSEL_NONE);
+
+ regmap_write(r_t, DOSET1_T, 0x95);
+ regmap_write(r_s, DOSET1_S, 0x80);
+
+ if (c->delivery_system == SYS_ISDBS)
+ sc1501a_s_tune(chip, c);
+ else if (c->delivery_system == SYS_ISDBT)
+ sc1501a_t_tune(chip, c);
+
+ if (fe->ops.tuner_ops.set_params) {
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+ fe->ops.tuner_ops.set_params(fe);
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+ }
+
+ return 0;
+}
+
+static int sc1501a_get_tune_settings(struct dvb_frontend *fe,
+ struct dvb_frontend_tune_settings *s)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+ s->min_delay_ms = 850;
+
+ if (c->delivery_system == SYS_ISDBS) {
+ s->max_drift = 30000 * 2 + 1;
+ s->step_size = 30000;
+ } else if (c->delivery_system == SYS_ISDBT) {
+ s->max_drift = 142857 * 2 + 1;
+ s->step_size = 142857 * 2;
+ }
+
+ return 0;
+}
+
+static int sc1501a_read_status(struct dvb_frontend *fe, enum fe_status *status)
+{
+ struct sc1501a_priv *chip = fe->demodulator_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+ if (c->delivery_system == SYS_ISDBS)
+ return sc1501a_s_read_status(chip, c, status);
+
+ if (c->delivery_system == SYS_ISDBT)
+ return sc1501a_t_read_status(chip, c, status);
+
+ return -EINVAL;
+}
+
+static const struct dvb_frontend_ops sc1501a_ops = {
+ .delsys = { SYS_ISDBS, SYS_ISDBT },
+ .info = {
+ .name = "Socionext SC1501A",
+ .frequency_min = 1032000,
+ .frequency_max = 770000000,
+ .caps = FE_CAN_INVERSION_AUTO | FE_CAN_FEC_AUTO |
+ FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
+ FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_HIERARCHY_AUTO,
+ },
+
+ .sleep = sc1501a_sleep,
+ .set_frontend = sc1501a_set_frontend,
+ .get_tune_settings = sc1501a_get_tune_settings,
+ .read_status = sc1501a_read_status,
+};
+
+static const struct regmap_config regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .cache_type = REGCACHE_NONE,
+};
+
+static int sc1501a_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct sc1501a_config *conf = client->dev.platform_data;
+ struct sc1501a_priv *chip;
+ struct device *dev = &client->dev;
+ int ret;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ if (dev->of_node)
+ chip->spec = of_device_get_match_data(dev);
+ else
+ chip->spec = (struct sc1501a_spec *)id->driver_data;
+ if (!chip->spec)
+ return -EINVAL;
+
+ chip->mclk = devm_clk_get(dev, "mclk");
+ if (IS_ERR(chip->mclk) && !conf) {
+ dev_err(dev, "Failed to request mclk: %ld\n",
+ PTR_ERR(chip->mclk));
+ return PTR_ERR(chip->mclk);
+ }
+
+ ret = of_property_read_u32(dev->of_node, "if-frequency",
+ &chip->if_freq);
+ if (ret && !conf) {
+ dev_err(dev, "Failed to load IF frequency: %d.\n", ret);
+ return ret;
+ }
+
+ chip->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(chip->reset_gpio)) {
+ dev_err(dev, "Failed to request reset_gpio: %ld\n",
+ PTR_ERR(chip->reset_gpio));
+ return PTR_ERR(chip->reset_gpio);
+ }
+
+ if (conf) {
+ chip->mclk = conf->mclk;
+ chip->if_freq = conf->if_freq;
+ chip->reset_gpio = conf->reset_gpio;
+
+ *conf->fe = &chip->fe;
+ }
+
+ chip->client_s = client;
+ chip->regmap_s = devm_regmap_init_i2c(chip->client_s, &regmap_config);
+ if (IS_ERR(chip->regmap_s))
+ return PTR_ERR(chip->regmap_s);
+
+ /*
+ * Chip has two I2C addresses for each satellite/terrestrial system.
+ * ISDB-T uses address ISDB-S + 4, so we register a dummy client.
+ */
+ chip->client_t = i2c_new_dummy(client->adapter, client->addr + 4);
+ if (!chip->client_t)
+ return -ENODEV;
+
+ chip->regmap_t = devm_regmap_init_i2c(chip->client_t, &regmap_config);
+ if (IS_ERR(chip->regmap_t)) {
+ ret = PTR_ERR(chip->regmap_t);
+ goto err_i2c_t;
+ }
+
+ chip->clk_freq = clk_get_rate(chip->mclk);
+
+ memcpy(&chip->fe.ops, &sc1501a_ops, sizeof(sc1501a_ops));
+ chip->fe.demodulator_priv = chip;
+ i2c_set_clientdata(client, chip);
+
+ sc1501a_cmn_power_on(chip);
+ sc1501a_s_sleep(chip);
+ sc1501a_t_sleep(chip);
+
+ return 0;
+
+err_i2c_t:
+ i2c_unregister_device(chip->client_t);
+
+ return ret;
+}
+
+static int sc1501a_remove(struct i2c_client *client)
+{
+ struct sc1501a_priv *chip = i2c_get_clientdata(client);
+
+ sc1501a_cmn_power_off(chip);
+
+ i2c_unregister_device(chip->client_t);
+
+ return 0;
+}
+
+static const struct sc1501a_spec sc1501a_spec_pri = {
+ .primary = true,
+};
+
+static const struct sc1501a_spec sc1501a_spec_sec = {
+ .primary = false,
+};
+
+static const struct of_device_id sc1501a_of_match[] = {
+ { .compatible = "socionext,mn884433", .data = &sc1501a_spec_pri, },
+ { .compatible = "socionext,mn884434-0", .data = &sc1501a_spec_pri, },
+ { .compatible = "socionext,mn884434-1", .data = &sc1501a_spec_sec, },
+ { .compatible = "socionext,sc1501a", .data = &sc1501a_spec_pri, },
+ {}
+};
+MODULE_DEVICE_TABLE(of, sc1501a_of_match);
+
+static const struct i2c_device_id sc1501a_i2c_id[] = {
+ { "mn884433", (kernel_ulong_t)&sc1501a_spec_pri },
+ { "mn884434-0", (kernel_ulong_t)&sc1501a_spec_pri },
+ { "mn884434-1", (kernel_ulong_t)&sc1501a_spec_sec },
+ { "sc1501a", (kernel_ulong_t)&sc1501a_spec_pri },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, sc1501a_i2c_id);
+
+static struct i2c_driver sc1501a_driver = {
+ .driver = {
+ .name = "sc1501a",
+ .of_match_table = of_match_ptr(sc1501a_of_match),
+ },
+ .probe = sc1501a_probe,
+ .remove = sc1501a_remove,
+ .id_table = sc1501a_i2c_id,
+};
+
+module_i2c_driver(sc1501a_driver);
+
+MODULE_AUTHOR("Katsuhiro Suzuki <suzuki.katsuhiro@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Socionext SC1501A series demodulator driver.");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/media/dvb-frontends/sc1501a.h b/drivers/media/dvb-frontends/sc1501a.h
new file mode 100644
index 000000000000..7e247d44e4ac
--- /dev/null
+++ b/drivers/media/dvb-frontends/sc1501a.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Socionext SC1501A series demodulator driver for ISDB-S/ISDB-T.
+ *
+ * Copyright (c) 2018 Socionext Inc.
+ */
+
+#ifndef SC1501A_H
+#define SC1501A_H
+
+#include <media/dvb_frontend.h>
+
+/* ISDB-T IF frequency */
+#define DIRECT_IF_57MHZ 57000000
+#define DIRECT_IF_44MHZ 44000000
+#define LOW_IF_4MHZ 4000000
+
+struct sc1501a_config {
+ struct clk *mclk;
+ u32 if_freq;
+ struct gpio_desc *reset_gpio;
+
+ /* Everything after that is returned by the driver. */
+ struct dvb_frontend **fe;
+};
+
+#endif /* SC1501A_H */
--
2.17.1