diff options
Diffstat (limited to 'drivers/media/dvb/frontends/atbm8830.c')
| -rw-r--r-- | drivers/media/dvb/frontends/atbm8830.c | 495 |
1 files changed, 495 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/atbm8830.c b/drivers/media/dvb/frontends/atbm8830.c new file mode 100644 index 00000000000..59881a5944e --- /dev/null +++ b/drivers/media/dvb/frontends/atbm8830.c @@ -0,0 +1,495 @@ +/* + * 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) + printk(KERN_DEBUG "%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(KERN_DEBUG "%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) + printk(KERN_DEBUG "%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_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 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 dvb_frontend_parameters *fe_params) +{ + 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, fe_params); + 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 dvb_frontend_parameters *fe_params) +{ + dprintk("%s\n", __func__); + + /* TODO: get real readings from device */ + /* inversion status */ + fe_params->inversion = INVERSION_OFF; + + /* bandwidth */ + fe_params->u.ofdm.bandwidth = BANDWIDTH_8_MHZ; + + fe_params->u.ofdm.code_rate_HP = FEC_AUTO; + fe_params->u.ofdm.code_rate_LP = FEC_AUTO; + + fe_params->u.ofdm.constellation = QAM_AUTO; + + /* transmission mode */ + fe_params->u.ofdm.transmission_mode = TRANSMISSION_MODE_AUTO; + + /* guard interval */ + fe_params->u.ofdm.guard_interval = GUARD_INTERVAL_AUTO; + + /* hierarchy */ + fe_params->u.ofdm.hierarchy_information = 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 = { + .info = { + .name = "AltoBeam ATBM8830/8831 DMB-TH", + .type = FE_OFDM, + .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"); |