1 files changed, 496 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/atbm8830.c b/drivers/media/dvb-frontends/atbm8830.c
new file mode 100644
index 0000000000..778c865085
--- /dev/null
+++ b/drivers/media/dvb-frontends/atbm8830.c
@@ -0,0 +1,496 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *    Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator
+ *    ATBM8830, ATBM8831
+ *
+ *    Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.com>
+ */
+
+#include <asm/div64.h>
+#include <media/dvb_frontend.h>
+
+#include "atbm8830.h"
+#include "atbm8830_priv.h"
+
+#define dprintk(args...) \
+	do { \
+		if (debug) \
+			printk(KERN_DEBUG "atbm8830: " args); \
+	} while (0)
+
+static int debug;
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data)
+{
+	int ret = 0;
+	u8 dev_addr;
+	u8 buf1[] = { reg >> 8, reg & 0xFF };
+	u8 buf2[] = { data };
+	struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
+	struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 };
+
+	dev_addr = priv->config->demod_address;
+	msg1.addr = dev_addr;
+	msg2.addr = dev_addr;
+
+	if (debug >= 2)
+		dprintk("%s: reg=0x%04X, data=0x%02X\n", __func__, reg, data);
+
+	ret = i2c_transfer(priv->i2c, &msg1, 1);
+	if (ret != 1)
+		return -EIO;
+
+	ret = i2c_transfer(priv->i2c, &msg2, 1);
+	return (ret != 1) ? -EIO : 0;
+}
+
+static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data)
+{
+	int ret;
+	u8 dev_addr;
+
+	u8 buf1[] = { reg >> 8, reg & 0xFF };
+	u8 buf2[] = { 0 };
+	struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
+	struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 };
+
+	dev_addr = priv->config->demod_address;
+	msg1.addr = dev_addr;
+	msg2.addr = dev_addr;
+
+	ret = i2c_transfer(priv->i2c, &msg1, 1);
+	if (ret != 1) {
+		dprintk("%s: error reg=0x%04x, ret=%i\n", __func__, reg, ret);
+		return -EIO;
+	}
+
+	ret = i2c_transfer(priv->i2c, &msg2, 1);
+	if (ret != 1)
+		return -EIO;
+
+	*p_data = buf2[0];
+	if (debug >= 2)
+		dprintk("%s: reg=0x%04X, data=0x%02X\n",
+			__func__, reg, buf2[0]);
+
+	return 0;
+}
+
+/* Lock register latch so that multi-register read is atomic */
+static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)
+{
+	return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0);
+}
+
+static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
+{
+	u32 val;
+	u64 t;
+
+	/* 0x100000 * freq / 30.4MHz */
+	t = (u64)0x100000 * freq;
+	do_div(t, 30400);
+	val = t;
+
+	atbm8830_write_reg(priv, REG_OSC_CLK, val);
+	atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);
+	atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16);
+
+	return 0;
+}
+
+static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
+{
+
+	u32 fs = priv->config->osc_clk_freq;
+	u64 t;
+	u32 val;
+	u8 dat;
+
+	if (freq != 0) {
+		/* 2 * PI * (freq - fs) / fs * (2 ^ 22) */
+		t = (u64) 2 * 31416 * (freq - fs);
+		t <<= 22;
+		do_div(t, fs);
+		do_div(t, 1000);
+		val = t;
+
+		atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);
+		atbm8830_write_reg(priv, REG_IF_FREQ, val);
+		atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);
+		atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16);
+
+		atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
+		dat &= 0xFC;
+		atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
+	} else {
+		/* Zero IF */
+		atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0);
+
+		atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
+		dat &= 0xFC;
+		dat |= 0x02;
+		atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
+
+		if (priv->config->zif_swap_iq)
+			atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03);
+		else
+			atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01);
+	}
+
+	return 0;
+}
+
+static int is_locked(struct atbm_state *priv, u8 *locked)
+{
+	u8 status;
+
+	atbm8830_read_reg(priv, REG_LOCK_STATUS, &status);
+
+	if (locked != NULL)
+		*locked = (status == 1);
+	return 0;
+}
+
+static int set_agc_config(struct atbm_state *priv,
+	u8 min, u8 max, u8 hold_loop)
+{
+	/* no effect if both min and max are zero */
+	if (!min && !max)
+	    return 0;
+
+	atbm8830_write_reg(priv, REG_AGC_MIN, min);
+	atbm8830_write_reg(priv, REG_AGC_MAX, max);
+	atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop);
+
+	return 0;
+}
+
+static int set_static_channel_mode(struct atbm_state *priv)
+{
+	int i;
+
+	for (i = 0; i < 5; i++)
+		atbm8830_write_reg(priv, 0x099B + i, 0x08);
+
+	atbm8830_write_reg(priv, 0x095B, 0x7F);
+	atbm8830_write_reg(priv, 0x09CB, 0x01);
+	atbm8830_write_reg(priv, 0x09CC, 0x7F);
+	atbm8830_write_reg(priv, 0x09CD, 0x7F);
+	atbm8830_write_reg(priv, 0x0E01, 0x20);
+
+	/* For single carrier */
+	atbm8830_write_reg(priv, 0x0B03, 0x0A);
+	atbm8830_write_reg(priv, 0x0935, 0x10);
+	atbm8830_write_reg(priv, 0x0936, 0x08);
+	atbm8830_write_reg(priv, 0x093E, 0x08);
+	atbm8830_write_reg(priv, 0x096E, 0x06);
+
+	/* frame_count_max0 */
+	atbm8830_write_reg(priv, 0x0B09, 0x00);
+	/* frame_count_max1 */
+	atbm8830_write_reg(priv, 0x0B0A, 0x08);
+
+	return 0;
+}
+
+static int set_ts_config(struct atbm_state *priv)
+{
+	const struct atbm8830_config *cfg = priv->config;
+
+	/*Set parallel/serial ts mode*/
+	atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0);
+	atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0);
+	/*Set ts sampling edge*/
+	atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE,
+		cfg->ts_sampling_edge ? 1 : 0);
+	/*Set ts clock freerun*/
+	atbm8830_write_reg(priv, REG_TS_CLK_FREERUN,
+		cfg->ts_clk_gated ? 0 : 1);
+
+	return 0;
+}
+
+static int atbm8830_init(struct dvb_frontend *fe)
+{
+	struct atbm_state *priv = fe->demodulator_priv;
+	const struct atbm8830_config *cfg = priv->config;
+
+	/*Set oscillator frequency*/
+	set_osc_freq(priv, cfg->osc_clk_freq);
+
+	/*Set IF frequency*/
+	set_if_freq(priv, cfg->if_freq);
+
+	/*Set AGC Config*/
+	set_agc_config(priv, cfg->agc_min, cfg->agc_max,
+		cfg->agc_hold_loop);
+
+	/*Set static channel mode*/
+	set_static_channel_mode(priv);
+
+	set_ts_config(priv);
+	/*Turn off DSP reset*/
+	atbm8830_write_reg(priv, 0x000A, 0);
+
+	/*SW version test*/
+	atbm8830_write_reg(priv, 0x020C, 11);
+
+	/* Run */
+	atbm8830_write_reg(priv, REG_DEMOD_RUN, 1);
+
+	return 0;
+}
+
+
+static void atbm8830_release(struct dvb_frontend *fe)
+{
+	struct atbm_state *state = fe->demodulator_priv;
+	dprintk("%s\n", __func__);
+
+	kfree(state);
+}
+
+static int atbm8830_set_fe(struct dvb_frontend *fe)
+{
+	struct atbm_state *priv = fe->demodulator_priv;
+	int i;
+	u8 locked = 0;
+	dprintk("%s\n", __func__);
+
+	/* set frequency */
+	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);
+	}
+
+	/* start auto lock */
+	for (i = 0; i < 10; i++) {
+		mdelay(100);
+		dprintk("Try %d\n", i);
+		is_locked(priv, &locked);
+		if (locked != 0) {
+			dprintk("ATBM8830 locked!\n");
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int atbm8830_get_fe(struct dvb_frontend *fe,
+			   struct dtv_frontend_properties *c)
+{
+	dprintk("%s\n", __func__);
+
+	/* TODO: get real readings from device */
+	/* inversion status */
+	c->inversion = INVERSION_OFF;
+
+	/* bandwidth */
+	c->bandwidth_hz = 8000000;
+
+	c->code_rate_HP = FEC_AUTO;
+	c->code_rate_LP = FEC_AUTO;
+
+	c->modulation = QAM_AUTO;
+
+	/* transmission mode */
+	c->transmission_mode = TRANSMISSION_MODE_AUTO;
+
+	/* guard interval */
+	c->guard_interval = GUARD_INTERVAL_AUTO;
+
+	/* hierarchy */
+	c->hierarchy = HIERARCHY_NONE;
+
+	return 0;
+}
+
+static int atbm8830_get_tune_settings(struct dvb_frontend *fe,
+	struct dvb_frontend_tune_settings *fesettings)
+{
+	fesettings->min_delay_ms = 0;
+	fesettings->step_size = 0;
+	fesettings->max_drift = 0;
+	return 0;
+}
+
+static int atbm8830_read_status(struct dvb_frontend *fe,
+				enum fe_status *fe_status)
+{
+	struct atbm_state *priv = fe->demodulator_priv;
+	u8 locked = 0;
+	u8 agc_locked = 0;
+
+	dprintk("%s\n", __func__);
+	*fe_status = 0;
+
+	is_locked(priv, &locked);
+	if (locked) {
+		*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
+			FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
+	}
+	dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
+
+	atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked);
+	dprintk("AGC Lock: %d\n", agc_locked);
+
+	return 0;
+}
+
+static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+	struct atbm_state *priv = fe->demodulator_priv;
+	u32 frame_err;
+	u8 t;
+
+	dprintk("%s\n", __func__);
+
+	atbm8830_reglatch_lock(priv, 1);
+
+	atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t);
+	frame_err = t & 0x7F;
+	frame_err <<= 8;
+	atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t);
+	frame_err |= t;
+
+	atbm8830_reglatch_lock(priv, 0);
+
+	*ber = frame_err * 100 / 32767;
+
+	dprintk("%s: ber=0x%x\n", __func__, *ber);
+	return 0;
+}
+
+static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
+{
+	struct atbm_state *priv = fe->demodulator_priv;
+	u32 pwm;
+	u8 t;
+
+	dprintk("%s\n", __func__);
+	atbm8830_reglatch_lock(priv, 1);
+
+	atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t);
+	pwm = t & 0x03;
+	pwm <<= 8;
+	atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t);
+	pwm |= t;
+
+	atbm8830_reglatch_lock(priv, 0);
+
+	dprintk("AGC PWM = 0x%02X\n", pwm);
+	pwm = 0x400 - pwm;
+
+	*signal = pwm * 0x10000 / 0x400;
+
+	return 0;
+}
+
+static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+	dprintk("%s\n", __func__);
+	*snr = 0;
+	return 0;
+}
+
+static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+	dprintk("%s\n", __func__);
+	*ucblocks = 0;
+	return 0;
+}
+
+static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
+{
+	struct atbm_state *priv = fe->demodulator_priv;
+
+	return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0);
+}
+
+static const struct dvb_frontend_ops atbm8830_ops = {
+	.delsys = { SYS_DTMB },
+	.info = {
+		.name = "AltoBeam ATBM8830/8831 DMB-TH",
+		.frequency_min_hz = 474 * MHz,
+		.frequency_max_hz = 858 * MHz,
+		.frequency_stepsize_hz = 10 * kHz,
+		.caps =
+			FE_CAN_FEC_AUTO |
+			FE_CAN_QAM_AUTO |
+			FE_CAN_TRANSMISSION_MODE_AUTO |
+			FE_CAN_GUARD_INTERVAL_AUTO
+	},
+
+	.release = atbm8830_release,
+
+	.init = atbm8830_init,
+	.sleep = NULL,
+	.write = NULL,
+	.i2c_gate_ctrl = atbm8830_i2c_gate_ctrl,
+
+	.set_frontend = atbm8830_set_fe,
+	.get_frontend = atbm8830_get_fe,
+	.get_tune_settings = atbm8830_get_tune_settings,
+
+	.read_status = atbm8830_read_status,
+	.read_ber = atbm8830_read_ber,
+	.read_signal_strength = atbm8830_read_signal_strength,
+	.read_snr = atbm8830_read_snr,
+	.read_ucblocks = atbm8830_read_ucblocks,
+};
+
+struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config,
+	struct i2c_adapter *i2c)
+{
+	struct atbm_state *priv = NULL;
+	u8 data = 0;
+
+	dprintk("%s()\n", __func__);
+
+	if (config == NULL || i2c == NULL)
+		return NULL;
+
+	priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL);
+	if (priv == NULL)
+		goto error_out;
+
+	priv->config = config;
+	priv->i2c = i2c;
+
+	/* check if the demod is there */
+	if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) {
+		dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n",
+			__func__, priv->config->demod_address);
+		goto error_out;
+	}
+	dprintk("atbm8830 chip id: 0x%02X\n", data);
+
+	memcpy(&priv->frontend.ops, &atbm8830_ops,
+	       sizeof(struct dvb_frontend_ops));
+	priv->frontend.demodulator_priv = priv;
+
+	atbm8830_init(&priv->frontend);
+
+	atbm8830_i2c_gate_ctrl(&priv->frontend, 1);
+
+	return &priv->frontend;
+
+error_out:
+	dprintk("%s() error_out\n", __func__);
+	kfree(priv);
+	return NULL;
+
+}
+EXPORT_SYMBOL_GPL(atbm8830_attach);
+
+MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
+MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
+MODULE_LICENSE("GPL");