--- /dev/null
+/*
+ * Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator
+ * ATBM8830, ATBM8831
+ *
+ * Copyright (C) 2009 David T.L. Wong <davidtlwong@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; 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 <asm/div64.h>
+#include "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 = &fe->dtv_property_cache;
+ 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, fe_status_t *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 struct dvb_frontend_ops atbm8830_ops = {
+ .delsys = { SYS_DTMB },
+ .info = {
+ .name = "AltoBeam ATBM8830/8831 DMB-TH",
+ .frequency_min = 474000000,
+ .frequency_max = 858000000,
+ .frequency_stepsize = 10000,
+ .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(atbm8830_attach);
+
+MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
+MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff