cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cx22700.c (10463B)


      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3    Conexant cx22700 DVB OFDM demodulator driver
      4
      5    Copyright (C) 2001-2002 Convergence Integrated Media GmbH
      6	Holger Waechtler <holger@convergence.de>
      7
      8
      9*/
     10
     11#include <linux/kernel.h>
     12#include <linux/init.h>
     13#include <linux/module.h>
     14#include <linux/string.h>
     15#include <linux/slab.h>
     16#include <media/dvb_frontend.h>
     17#include "cx22700.h"
     18
     19
     20struct cx22700_state {
     21
     22	struct i2c_adapter* i2c;
     23
     24	const struct cx22700_config* config;
     25
     26	struct dvb_frontend frontend;
     27};
     28
     29
     30static int debug;
     31#define dprintk(args...) \
     32	do { \
     33		if (debug) printk(KERN_DEBUG "cx22700: " args); \
     34	} while (0)
     35
     36static u8 init_tab [] = {
     37	0x04, 0x10,
     38	0x05, 0x09,
     39	0x06, 0x00,
     40	0x08, 0x04,
     41	0x09, 0x00,
     42	0x0a, 0x01,
     43	0x15, 0x40,
     44	0x16, 0x10,
     45	0x17, 0x87,
     46	0x18, 0x17,
     47	0x1a, 0x10,
     48	0x25, 0x04,
     49	0x2e, 0x00,
     50	0x39, 0x00,
     51	0x3a, 0x04,
     52	0x45, 0x08,
     53	0x46, 0x02,
     54	0x47, 0x05,
     55};
     56
     57
     58static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
     59{
     60	int ret;
     61	u8 buf [] = { reg, data };
     62	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
     63
     64	dprintk ("%s\n", __func__);
     65
     66	ret = i2c_transfer (state->i2c, &msg, 1);
     67
     68	if (ret != 1)
     69		printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
     70			__func__, reg, data, ret);
     71
     72	return (ret != 1) ? -1 : 0;
     73}
     74
     75static int cx22700_readreg (struct cx22700_state* state, u8 reg)
     76{
     77	int ret;
     78	u8 b0 [] = { reg };
     79	u8 b1 [] = { 0 };
     80	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
     81			   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
     82
     83	dprintk ("%s\n", __func__);
     84
     85	ret = i2c_transfer (state->i2c, msg, 2);
     86
     87	if (ret != 2) return -EIO;
     88
     89	return b1[0];
     90}
     91
     92static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
     93{
     94	u8 val;
     95
     96	dprintk ("%s\n", __func__);
     97
     98	switch (inversion) {
     99	case INVERSION_AUTO:
    100		return -EOPNOTSUPP;
    101	case INVERSION_ON:
    102		val = cx22700_readreg (state, 0x09);
    103		return cx22700_writereg (state, 0x09, val | 0x01);
    104	case INVERSION_OFF:
    105		val = cx22700_readreg (state, 0x09);
    106		return cx22700_writereg (state, 0x09, val & 0xfe);
    107	default:
    108		return -EINVAL;
    109	}
    110}
    111
    112static int cx22700_set_tps(struct cx22700_state *state,
    113			   struct dtv_frontend_properties *p)
    114{
    115	static const u8 qam_tab [4] = { 0, 1, 0, 2 };
    116	static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
    117	u8 val;
    118
    119	dprintk ("%s\n", __func__);
    120
    121	if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
    122		return -EINVAL;
    123
    124	if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
    125		return -EINVAL;
    126
    127	if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
    128		return -EINVAL;
    129
    130	if ((int)p->guard_interval < GUARD_INTERVAL_1_32 ||
    131	    p->guard_interval > GUARD_INTERVAL_1_4)
    132		return -EINVAL;
    133
    134	if (p->transmission_mode != TRANSMISSION_MODE_2K &&
    135	    p->transmission_mode != TRANSMISSION_MODE_8K)
    136		return -EINVAL;
    137
    138	if (p->modulation != QPSK &&
    139	    p->modulation != QAM_16 &&
    140	    p->modulation != QAM_64)
    141		return -EINVAL;
    142
    143	if ((int)p->hierarchy < HIERARCHY_NONE ||
    144	    p->hierarchy > HIERARCHY_4)
    145		return -EINVAL;
    146
    147	if (p->bandwidth_hz > 8000000 || p->bandwidth_hz < 6000000)
    148		return -EINVAL;
    149
    150	if (p->bandwidth_hz == 7000000)
    151		cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
    152	else
    153		cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
    154
    155	val = qam_tab[p->modulation - QPSK];
    156	val |= p->hierarchy - HIERARCHY_NONE;
    157
    158	cx22700_writereg (state, 0x04, val);
    159
    160	if (p->code_rate_HP - FEC_1_2 >= sizeof(fec_tab) ||
    161	    p->code_rate_LP - FEC_1_2 >= sizeof(fec_tab))
    162		return -EINVAL;
    163	val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
    164	val |= fec_tab[p->code_rate_LP - FEC_1_2];
    165
    166	cx22700_writereg (state, 0x05, val);
    167
    168	val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
    169	val |= p->transmission_mode - TRANSMISSION_MODE_2K;
    170
    171	cx22700_writereg (state, 0x06, val);
    172
    173	cx22700_writereg (state, 0x08, 0x04 | 0x02);  /* use user tps parameters */
    174	cx22700_writereg (state, 0x08, 0x04);         /* restart acquisition */
    175
    176	return 0;
    177}
    178
    179static int cx22700_get_tps(struct cx22700_state *state,
    180			   struct dtv_frontend_properties *p)
    181{
    182	static const enum fe_modulation qam_tab[3] = { QPSK, QAM_16, QAM_64 };
    183	static const enum fe_code_rate fec_tab[5] = {
    184		FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8
    185	};
    186	u8 val;
    187
    188	dprintk ("%s\n", __func__);
    189
    190	if (!(cx22700_readreg(state, 0x07) & 0x20))  /*  tps valid? */
    191		return -EAGAIN;
    192
    193	val = cx22700_readreg (state, 0x01);
    194
    195	if ((val & 0x7) > 4)
    196		p->hierarchy = HIERARCHY_AUTO;
    197	else
    198		p->hierarchy = HIERARCHY_NONE + (val & 0x7);
    199
    200	if (((val >> 3) & 0x3) > 2)
    201		p->modulation = QAM_AUTO;
    202	else
    203		p->modulation = qam_tab[(val >> 3) & 0x3];
    204
    205	val = cx22700_readreg (state, 0x02);
    206
    207	if (((val >> 3) & 0x07) > 4)
    208		p->code_rate_HP = FEC_AUTO;
    209	else
    210		p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
    211
    212	if ((val & 0x07) > 4)
    213		p->code_rate_LP = FEC_AUTO;
    214	else
    215		p->code_rate_LP = fec_tab[val & 0x07];
    216
    217	val = cx22700_readreg (state, 0x03);
    218
    219	p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
    220	p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
    221
    222	return 0;
    223}
    224
    225static int cx22700_init (struct dvb_frontend* fe)
    226
    227{	struct cx22700_state* state = fe->demodulator_priv;
    228	int i;
    229
    230	dprintk("cx22700_init: init chip\n");
    231
    232	cx22700_writereg (state, 0x00, 0x02);   /*  soft reset */
    233	cx22700_writereg (state, 0x00, 0x00);
    234
    235	msleep(10);
    236
    237	for (i=0; i<sizeof(init_tab); i+=2)
    238		cx22700_writereg (state, init_tab[i], init_tab[i+1]);
    239
    240	cx22700_writereg (state, 0x00, 0x01);
    241
    242	return 0;
    243}
    244
    245static int cx22700_read_status(struct dvb_frontend *fe, enum fe_status *status)
    246{
    247	struct cx22700_state* state = fe->demodulator_priv;
    248
    249	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
    250		   | (cx22700_readreg (state, 0x0e) << 1);
    251	u8 sync = cx22700_readreg (state, 0x07);
    252
    253	*status = 0;
    254
    255	if (rs_ber < 0xff00)
    256		*status |= FE_HAS_SIGNAL;
    257
    258	if (sync & 0x20)
    259		*status |= FE_HAS_CARRIER;
    260
    261	if (sync & 0x10)
    262		*status |= FE_HAS_VITERBI;
    263
    264	if (sync & 0x10)
    265		*status |= FE_HAS_SYNC;
    266
    267	if (*status == 0x0f)
    268		*status |= FE_HAS_LOCK;
    269
    270	return 0;
    271}
    272
    273static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
    274{
    275	struct cx22700_state* state = fe->demodulator_priv;
    276
    277	*ber = cx22700_readreg (state, 0x0c) & 0x7f;
    278	cx22700_writereg (state, 0x0c, 0x00);
    279
    280	return 0;
    281}
    282
    283static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
    284{
    285	struct cx22700_state* state = fe->demodulator_priv;
    286
    287	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
    288		   | (cx22700_readreg (state, 0x0e) << 1);
    289	*signal_strength = ~rs_ber;
    290
    291	return 0;
    292}
    293
    294static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
    295{
    296	struct cx22700_state* state = fe->demodulator_priv;
    297
    298	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
    299		   | (cx22700_readreg (state, 0x0e) << 1);
    300	*snr = ~rs_ber;
    301
    302	return 0;
    303}
    304
    305static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
    306{
    307	struct cx22700_state* state = fe->demodulator_priv;
    308
    309	*ucblocks = cx22700_readreg (state, 0x0f);
    310	cx22700_writereg (state, 0x0f, 0x00);
    311
    312	return 0;
    313}
    314
    315static int cx22700_set_frontend(struct dvb_frontend *fe)
    316{
    317	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
    318	struct cx22700_state* state = fe->demodulator_priv;
    319
    320	cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
    321	cx22700_writereg (state, 0x00, 0x00);
    322
    323	if (fe->ops.tuner_ops.set_params) {
    324		fe->ops.tuner_ops.set_params(fe);
    325		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
    326	}
    327
    328	cx22700_set_inversion(state, c->inversion);
    329	cx22700_set_tps(state, c);
    330	cx22700_writereg (state, 0x37, 0x01);  /* PAL loop filter off */
    331	cx22700_writereg (state, 0x00, 0x01);  /* restart acquire */
    332
    333	return 0;
    334}
    335
    336static int cx22700_get_frontend(struct dvb_frontend *fe,
    337				struct dtv_frontend_properties *c)
    338{
    339	struct cx22700_state* state = fe->demodulator_priv;
    340	u8 reg09 = cx22700_readreg (state, 0x09);
    341
    342	c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
    343	return cx22700_get_tps(state, c);
    344}
    345
    346static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
    347{
    348	struct cx22700_state* state = fe->demodulator_priv;
    349
    350	if (enable) {
    351		return cx22700_writereg(state, 0x0a, 0x00);
    352	} else {
    353		return cx22700_writereg(state, 0x0a, 0x01);
    354	}
    355}
    356
    357static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
    358{
    359	fesettings->min_delay_ms = 150;
    360	fesettings->step_size = 166667;
    361	fesettings->max_drift = 166667*2;
    362	return 0;
    363}
    364
    365static void cx22700_release(struct dvb_frontend* fe)
    366{
    367	struct cx22700_state* state = fe->demodulator_priv;
    368	kfree(state);
    369}
    370
    371static const struct dvb_frontend_ops cx22700_ops;
    372
    373struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
    374				    struct i2c_adapter* i2c)
    375{
    376	struct cx22700_state* state = NULL;
    377
    378	/* allocate memory for the internal state */
    379	state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);
    380	if (state == NULL) goto error;
    381
    382	/* setup the state */
    383	state->config = config;
    384	state->i2c = i2c;
    385
    386	/* check if the demod is there */
    387	if (cx22700_readreg(state, 0x07) < 0) goto error;
    388
    389	/* create dvb_frontend */
    390	memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
    391	state->frontend.demodulator_priv = state;
    392	return &state->frontend;
    393
    394error:
    395	kfree(state);
    396	return NULL;
    397}
    398
    399static const struct dvb_frontend_ops cx22700_ops = {
    400	.delsys = { SYS_DVBT },
    401	.info = {
    402		.name			= "Conexant CX22700 DVB-T",
    403		.frequency_min_hz	= 470 * MHz,
    404		.frequency_max_hz	= 860 * MHz,
    405		.frequency_stepsize_hz	= 166667,
    406		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
    407		      FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
    408		      FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
    409		      FE_CAN_RECOVER
    410	},
    411
    412	.release = cx22700_release,
    413
    414	.init = cx22700_init,
    415	.i2c_gate_ctrl = cx22700_i2c_gate_ctrl,
    416
    417	.set_frontend = cx22700_set_frontend,
    418	.get_frontend = cx22700_get_frontend,
    419	.get_tune_settings = cx22700_get_tune_settings,
    420
    421	.read_status = cx22700_read_status,
    422	.read_ber = cx22700_read_ber,
    423	.read_signal_strength = cx22700_read_signal_strength,
    424	.read_snr = cx22700_read_snr,
    425	.read_ucblocks = cx22700_read_ucblocks,
    426};
    427
    428module_param(debug, int, 0644);
    429MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
    430
    431MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
    432MODULE_AUTHOR("Holger Waechtler");
    433MODULE_LICENSE("GPL");
    434
    435EXPORT_SYMBOL(cx22700_attach);