/* * Support for LGDT3302 and LGDT3303 - VSB/QAM * * Copyright (C) 2005 Wilson Michaels * * 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. * */ /* * NOTES ABOUT THIS DRIVER * * This Linux driver supports: * DViCO FusionHDTV 3 Gold-Q * DViCO FusionHDTV 3 Gold-T * DViCO FusionHDTV 5 Gold * DViCO FusionHDTV 5 Lite * DViCO FusionHDTV 5 USB Gold * Air2PC/AirStar 2 ATSC 3rd generation (HD5000) * pcHDTV HD5500 * * TODO: * signal strength always returns 0. * */ #include #include #include #include #include #include #include #include #include "dvb_frontend.h" #include "lgdt330x_priv.h" #include "lgdt330x.h" static int debug = 0; module_param(debug, int, 0644); MODULE_PARM_DESC(debug,"Turn on/off lgdt330x frontend debugging (default:off)."); #define dprintk(args...) \ do { \ if (debug) printk(KERN_DEBUG "lgdt330x: " args); \ } while (0) struct lgdt330x_state { struct i2c_adapter* i2c; /* Configuration settings */ const struct lgdt330x_config* config; struct dvb_frontend frontend; /* Demodulator private data */ fe_modulation_t current_modulation; /* Tuner private data */ u32 current_frequency; }; static int i2c_write_demod_bytes (struct lgdt330x_state* state, u8 *buf, /* data bytes to send */ int len /* number of bytes to send */ ) { struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 }; int i; int err; for (i=0; ii2c, &msg, 1)) != 1) { printk(KERN_WARNING "lgdt330x: %s error (addr %02x <- %02x, err = %i)\n", __FUNCTION__, msg.buf[0], msg.buf[1], err); if (err < 0) return err; else return -EREMOTEIO; } msg.buf += 2; } return 0; } /* * This routine writes the register (reg) to the demod bus * then reads the data returned for (len) bytes. */ static u8 i2c_read_demod_bytes (struct lgdt330x_state* state, enum I2C_REG reg, u8* buf, int len) { u8 wr [] = { reg }; struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = wr, .len = 1 }, { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = buf, .len = len }, }; int ret; ret = i2c_transfer(state->i2c, msg, 2); if (ret != 2) { printk(KERN_WARNING "lgdt330x: %s: addr 0x%02x select 0x%02x error (ret == %i)\n", __FUNCTION__, state->config->demod_address, reg, ret); } else { ret = 0; } return ret; } /* Software reset */ static int lgdt3302_SwReset(struct lgdt330x_state* state) { u8 ret; u8 reset[] = { IRQ_MASK, 0x00 /* bit 6 is active low software reset * bits 5-0 are 1 to mask interrupts */ }; ret = i2c_write_demod_bytes(state, reset, sizeof(reset)); if (ret == 0) { /* force reset high (inactive) and unmask interrupts */ reset[1] = 0x7f; ret = i2c_write_demod_bytes(state, reset, sizeof(reset)); } return ret; } static int lgdt3303_SwReset(struct lgdt330x_state* state) { u8 ret; u8 reset[] = { 0x02, 0x00 /* bit 0 is active low software reset */ }; ret = i2c_write_demod_bytes(state, reset, sizeof(reset)); if (ret == 0) { /* force reset high (inactive) */ reset[1] = 0x01; ret = i2c_write_demod_bytes(state, reset, sizeof(reset)); } return ret; } static int lgdt330x_SwReset(struct lgdt330x_state* state) { switch (state->config->demod_chip) { case LGDT3302: return lgdt3302_SwReset(state); case LGDT3303: return lgdt3303_SwReset(state); default: return -ENODEV; } } static int lgdt330x_init(struct dvb_frontend* fe) { /* Hardware reset is done using gpio[0] of cx23880x chip. * I'd like to do it here, but don't know how to find chip address. * cx88-cards.c arranges for the reset bit to be inactive (high). * Maybe there needs to be a callable function in cx88-core or * the caller of this function needs to do it. */ /* * Array of byte pairs * to initialize each different chip */ static u8 lgdt3302_init_data[] = { /* Use 50MHz parameter values from spec sheet since xtal is 50 */ /* Change the value of NCOCTFV[25:0] of carrier recovery center frequency register */ VSB_CARRIER_FREQ0, 0x00, VSB_CARRIER_FREQ1, 0x87, VSB_CARRIER_FREQ2, 0x8e, VSB_CARRIER_FREQ3, 0x01, /* Change the TPCLK pin polarity data is valid on falling clock */ DEMUX_CONTROL, 0xfb, /* Change the value of IFBW[11:0] of AGC IF/RF loop filter bandwidth register */ AGC_RF_BANDWIDTH0, 0x40, AGC_RF_BANDWIDTH1, 0x93, AGC_RF_BANDWIDTH2, 0x00, /* Change the value of bit 6, 'nINAGCBY' and 'NSSEL[1:0] of ACG function control register 2 */ AGC_FUNC_CTRL2, 0xc6, /* Change the value of bit 6 'RFFIX' of AGC function control register 3 */ AGC_FUNC_CTRL3, 0x40, /* Set the value of 'INLVTHD' register 0x2a/0x2c to 0x7fe */ AGC_DELAY0, 0x07, AGC_DELAY2, 0xfe, /* Change the value of IAGCBW[15:8] of inner AGC loop filter bandwidth */ AGC_LOOP_BANDWIDTH0, 0x08, AGC_LOOP_BANDWIDTH1, 0x9a }; static u8 lgdt3303_init_data[] = { 0x4c, 0x14 }; static u8 flip_lgdt3303_init_data[] = { 0x4c, 0x14, 0x87, 0xf3 }; struct lgdt330x_state* state = fe->demodulator_priv; char *chip_name; int err; switch (state->config->demod_chip) { case LGDT3302: chip_name = "LGDT3302"; err = i2c_write_demod_bytes(state, lgdt3302_init_data, sizeof(lgdt3302_init_data)); break; case LGDT3303: chip_name = "LGDT3303"; if (state->config->clock_polarity_flip) { err = i2c_write_demod_bytes(state, flip_lgdt3303_init_data, sizeof(flip_lgdt3303_init_data)); } else { err = i2c_write_demod_bytes(state, lgdt3303_init_data, sizeof(lgdt3303_init_data)); } break; default: chip_name = "undefined"; printk (KERN_WARNING "Only LGDT3302 and LGDT3303 are supported chips.\n"); err = -ENODEV; } dprintk("%s entered as %s\n", __FUNCTION__, chip_name); if (err < 0) return err; return lgdt330x_SwReset(state); } static int lgdt330x_read_ber(struct dvb_frontend* fe, u32* ber) { *ber = 0; /* Not supplied by the demod chips */ return 0; } static int lgdt330x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) { struct lgdt330x_state* state = fe->demodulator_priv; int err; u8 buf[2]; switch (state->config->demod_chip) { case LGDT3302: err = i2c_read_demod_bytes(state, LGDT3302_PACKET_ERR_COUNTER1, buf, sizeof(buf)); break; case LGDT3303: err = i2c_read_demod_bytes(state, LGDT3303_PACKET_ERR_COUNTER1, buf, sizeof(buf)); break; default: printk(KERN_WARNING "Only LGDT3302 and LGDT3303 are supported chips.\n"); err = -ENODEV; } *ucblocks = (buf[0] << 8) | buf[1]; return 0; } static int lgdt330x_set_parameters(struct dvb_frontend* fe, struct dvb_frontend_parameters *param) { /* * Array of byte pairs * to initialize 8VSB for lgdt3303 chip 50 MHz IF */ static u8 lgdt3303_8vsb_44_data[] = { 0x04, 0x00, 0x0d, 0x40, 0x0e, 0x87, 0x0f, 0x8e, 0x10, 0x01, 0x47, 0x8b }; /* * Array of byte pairs * to initialize QAM for lgdt3303 chip */ static u8 lgdt3303_qam_data[] = { 0x04, 0x00, 0x0d, 0x00, 0x0e, 0x00, 0x0f, 0x00, 0x10, 0x00, 0x51, 0x63, 0x47, 0x66, 0x48, 0x66, 0x4d, 0x1a, 0x49, 0x08, 0x4a, 0x9b }; struct lgdt330x_state* state = fe->demodulator_priv; static u8 top_ctrl_cfg[] = { TOP_CONTROL, 0x03 }; int err; /* Change only if we are actually changing the modulation */ if (state->current_modulation != param->u.vsb.modulation) { switch(param->u.vsb.modulation) { case VSB_8: dprintk("%s: VSB_8 MODE\n", __FUNCTION__); /* Select VSB mode */ top_ctrl_cfg[1] = 0x03; /* Select ANT connector if supported by card */ if (state->config->pll_rf_set) state->config->pll_rf_set(fe, 1); if (state->config->demod_chip == LGDT3303) { err = i2c_write_demod_bytes(state, lgdt3303_8vsb_44_data, sizeof(lgdt3303_8vsb_44_data)); } break; case QAM_64: dprintk("%s: QAM_64 MODE\n", __FUNCTION__); /* Select QAM_64 mode */ top_ctrl_cfg[1] = 0x00; /* Select CABLE connector if supported by card */ if (state->config->pll_rf_set) state->config->pll_rf_set(fe, 0); if (state->config->demod_chip == LGDT3303) { err = i2c_write_demod_bytes(state, lgdt3303_qam_data, sizeof(lgdt3303_qam_data)); } break; case QAM_256: dprintk("%s: QAM_256 MODE\n", __FUNCTION__); /* Select QAM_256 mode */ top_ctrl_cfg[1] = 0x01; /* Select CABLE connector if supported by card */ if (state->config->pll_rf_set) state->config->pll_rf_set(fe, 0); if (state->config->demod_chip == LGDT3303) { err = i2c_write_demod_bytes(state, lgdt3303_qam_data, sizeof(lgdt3303_qam_data)); } break; default: printk(KERN_WARNING "lgdt330x: %s: Modulation type(%d) UNSUPPORTED\n", __FUNCTION__, param->u.vsb.modulation); return -1; } /* * select serial or parallel MPEG harware interface * Serial: 0x04 for LGDT3302 or 0x40 for LGDT3303 * Parallel: 0x00 */ top_ctrl_cfg[1] |= state->config->serial_mpeg; /* Select the requested mode */ i2c_write_demod_bytes(state, top_ctrl_cfg, sizeof(top_ctrl_cfg)); if (state->config->set_ts_params) state->config->set_ts_params(fe, 0); state->current_modulation = param->u.vsb.modulation; } /* Tune to the specified frequency */ if (fe->ops.tuner_ops.set_params) { fe->ops.tuner_ops.set_params(fe, param); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); } /* Keep track of the new frequency */ /* FIXME this is the wrong way to do this... */ /* The tuner is shared with the video4linux analog API */ state->current_frequency = param->frequency; lgdt330x_SwReset(state); return 0; } static int lgdt330x_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters* param) { struct lgdt330x_state *state = fe->demodulator_priv; param->frequency = state->current_frequency; return 0; } static int lgdt3302_read_status(struct dvb_frontend* fe, fe_status_t* status) { struct lgdt330x_state* state = fe->demodulator_priv; u8 buf[3]; *status = 0; /* Reset status result */ /* AGC status register */ i2c_read_demod_bytes(state, AGC_STATUS, buf, 1); dprintk("%s: AGC_STATUS = 0x%02x\n", __FUNCTION__, buf[0]); if ((buf[0] & 0x0c) == 0x8){ /* Test signal does not exist flag */ /* as well as the AGC lock flag. */ *status |= FE_HAS_SIGNAL; } /* * You must set the Mask bits to 1 in the IRQ_MASK in order * to see that status bit in the IRQ_STATUS register. * This is done in SwReset(); */ /* signal status */ i2c_read_demod_bytes(state, TOP_CONTROL, buf, sizeof(buf)); dprintk("%s: TOP_CONTROL = 0x%02x, IRO_MASK = 0x%02x, IRQ_STATUS = 0x%02x\n", __FUNCTION__, buf[0], buf[1], buf[2]); /* sync status */ if ((buf[2] & 0x03) == 0x01) { *status |= FE_HAS_SYNC; } /* FEC error status */ if ((buf[2] & 0x0c) == 0x08) { *status |= FE_HAS_LOCK; *status |= FE_HAS_VITERBI; } /* Carrier Recovery Lock Status Register */ i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1); dprintk("%s: CARRIER_LOCK = 0x%02x\n", __FUNCTION__, buf[0]); switch (state->current_modulation) { case QAM_256: case QAM_64: /* Need to undestand why there are 3 lock levels here */ if ((buf[0] & 0x07) == 0x07) *status |= FE_HAS_CARRIER; break; case VSB_8: if ((buf[0] & 0x80) == 0x80) *status |= FE_HAS_CARRIER; break; default: printk("KERN_WARNING lgdt330x: %s: Modulation set to unsupported value\n", __FUNCTION__); } return 0; } static int lgdt3303_read_status(struct dvb_frontend* fe, fe_status_t* status) { struct lgdt330x_state* state = fe->demodulator_priv; int err; u8 buf[3]; *status = 0; /* Reset status result */ /* lgdt3303 AGC status register */ err = i2c_read_demod_bytes(state, 0x58, buf, 1); if (err < 0) return err; dprintk("%s: AGC_STATUS = 0x%02x\n", __FUNCTION__, buf[0]); if ((buf[0] & 0x21) == 0x01){ /* Test input signal does not exist flag */ /* as well as the AGC lock flag. */ *status |= FE_HAS_SIGNAL; } /* Carrier Recovery Lock Status Register */ i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1); dprintk("%s: CARRIER_LOCK = 0x%02x\n", __FUNCTION__, buf[0]); switch (state->current_modulation) { case QAM_256: case QAM_64: /* Need to undestand why there are 3 lock levels here */ if ((buf[0] & 0x07) == 0x07) *status |= FE_HAS_CARRIER; else break; i2c_read_demod_bytes(state, 0x8a, buf, 1); if ((buf[0] & 0x04) == 0x04) *status |= FE_HAS_SYNC; if ((buf[0] & 0x01) == 0x01) *status |= FE_HAS_LOCK; if ((buf[0] & 0x08) == 0x08) *status |= FE_HAS_VITERBI; break; case VSB_8: if ((buf[0] & 0x80) == 0x80) *status |= FE_HAS_CARRIER; else break; i2c_read_demod_bytes(state, 0x38, buf, 1); if ((buf[0] & 0x02) == 0x00) *status |= FE_HAS_SYNC; if ((buf[0] & 0x01) == 0x01) { *status |= FE_HAS_LOCK; *status |= FE_HAS_VITERBI; } break; default: printk("KERN_WARNING lgdt330x: %s: Modulation set to unsupported value\n", __FUNCTION__); } return 0; } static int lgdt330x_read_signal_strength(struct dvb_frontend* fe, u16* strength) { /* not directly available. */ *strength = 0; return 0; } static int lgdt3302_read_snr(struct dvb_frontend* fe, u16* snr) { #ifdef SNR_IN_DB /* * Spec sheet shows formula for SNR_EQ = 10 log10(25 * 24**2 / noise) * and SNR_PH = 10 log10(25 * 32**2 / noise) for equalizer and phase tracker * respectively. The following tables are built on these formulas. * The usual definition is SNR = 20 log10(signal/noise) * If the specification is wrong the value retuned is 1/2 the actual SNR in db. * * This table is a an ordered list of noise values computed by the * formula from the spec sheet such that the index into the table * starting at 43 or 45 is the SNR value in db. There are duplicate noise * value entries at the beginning because the SNR varies more than * 1 db for a change of 1 digit in noise at very small values of noise. * * Examples from SNR_EQ table: * noise SNR * 0 43 * 1 42 * 2 39 * 3 37 * 4 36 * 5 35 * 6 34 * 7 33 * 8 33 * 9 32 * 10 32 * 11 31 * 12 31 * 13 30 */ static const u32 SNR_EQ[] = { 1, 2, 2, 2, 3, 3, 4, 4, 5, 7, 9, 11, 13, 17, 21, 26, 33, 41, 52, 65, 81, 102, 129, 162, 204, 257, 323, 406, 511, 644, 810, 1020, 1284, 1616, 2035, 2561, 3224, 4059, 5110, 6433, 8098, 10195, 12835, 16158, 20341, 25608, 32238, 40585, 51094, 64323, 80978, 101945, 128341, 161571, 203406, 256073, 0x40000 }; static const u32 SNR_PH[] = { 1, 2, 2, 2, 3, 3, 4, 5, 6, 8, 10, 12, 15, 19, 23, 29, 37, 46, 58, 73, 91, 115, 144, 182, 229, 288, 362, 456, 574, 722, 909, 1144, 1440, 1813, 2282, 2873, 3617, 4553, 5732, 7216, 9084, 11436, 14396, 18124, 22817, 28724, 36161, 45524, 57312, 72151, 90833, 114351, 143960, 181235, 228161, 0x080000 }; static u8 buf[5];/* read data buffer */ static u32 noise; /* noise value */ static u32 snr_db; /* index into SNR_EQ[] */ struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv; /* read both equalizer and phase tracker noise data */ i2c_read_demod_bytes(state, EQPH_ERR0, buf, sizeof(buf)); if (state->current_modulation == VSB_8) { /* Equalizer Mean-Square Error Register for VSB */ noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2]; /* * Look up noise value in table. * A better search algorithm could be used... * watch out there are duplicate entries. */ for (snr_db = 0; snr_db < sizeof(SNR_EQ); snr_db++) { if (noise < SNR_EQ[snr_db]) { *snr = 43 - snr_db; break; } } } else { /* Phase Tracker Mean-Square Error Register for QAM */ noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4]; /* Look up noise value in table. */ for (snr_db = 0; snr_db < sizeof(SNR_PH); snr_db++) { if (noise < SNR_PH[snr_db]) { *snr = 45 - snr_db; break; } } } #else /* Return the raw noise value */ static u8 buf[5];/* read data buffer */ static u32 noise; /* noise value */ struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv; /* read both equalizer and pase tracker noise data */ i2c_read_demod_bytes(state, EQPH_ERR0, buf, sizeof(buf)); if (state->current_modulation == VSB_8) { /* Phase Tracker Mean-Square Error Register for VSB */ noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4]; } else { /* Carrier Recovery Mean-Square Error for QAM */ i2c_read_demod_bytes(state, 0x1a, buf, 2); noise = ((buf[0] & 3) << 8) | buf[1]; } /* Small values for noise mean signal is better so invert noise */ *snr = ~noise; #endif dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr); return 0; } static int lgdt3303_read_snr(struct dvb_frontend* fe, u16* snr) { /* Return the raw noise value */ static u8 buf[5];/* read data buffer */ static u32 noise; /* noise value */ struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv; if (state->current_modulation == VSB_8) { i2c_read_demod_bytes(state, 0x6e, buf, 5); /* Phase Tracker Mean-Square Error Register for VSB */ noise = ((buf[0] & 7) << 16) | (buf[3] << 8) | buf[4]; } else { /* Carrier Recovery Mean-Square Error for QAM */ i2c_read_demod_bytes(state, 0x1a, buf, 2); noise = (buf[0] << 8) | buf[1]; } /* Small values for noise mean signal is better so invert noise */ *snr = ~noise; dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr); return 0; } static int lgdt330x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings) { /* I have no idea about this - it may not be needed */ fe_tune_settings->min_delay_ms = 500; fe_tune_settings->step_size = 0; fe_tune_settings->max_drift = 0; return 0; } static void lgdt330x_release(struct dvb_frontend* fe) { struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv; kfree(state); } static struct dvb_frontend_ops lgdt3302_ops; static struct dvb_frontend_ops lgdt3303_ops; struct dvb_frontend* lgdt330x_attach(const struct lgdt330x_config* config, struct i2c_adapter* i2c) { struct lgdt330x_state* state = NULL; u8 buf[1]; /* Allocate memory for the internal state */ state = kzalloc(sizeof(struct lgdt330x_state), GFP_KERNEL); if (state == NULL) goto error; /* Setup the state */ state->config = config; state->i2c = i2c; /* Create dvb_frontend */ switch (config->demod_chip) { case LGDT3302: memcpy(&state->frontend.ops, &lgdt3302_ops, sizeof(struct dvb_frontend_ops)); break; case LGDT3303: memcpy(&state->frontend.ops, &lgdt3303_ops, sizeof(struct dvb_frontend_ops)); break; default: goto error; } state->frontend.demodulator_priv = state; /* Verify communication with demod chip */ if (i2c_read_demod_bytes(state, 2, buf, 1)) goto error; state->current_frequency = -1; state->current_modulation = -1; return &state->frontend; error: kfree(state); dprintk("%s: ERROR\n",__FUNCTION__); return NULL; } static struct dvb_frontend_ops lgdt3302_ops = { .info = { .name= "LG Electronics LGDT3302 VSB/QAM Frontend", .type = FE_ATSC, .frequency_min= 54000000, .frequency_max= 858000000, .frequency_stepsize= 62500, .symbol_rate_min = 5056941, /* QAM 64 */ .symbol_rate_max = 10762000, /* VSB 8 */ .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB }, .init = lgdt330x_init, .set_frontend = lgdt330x_set_parameters, .get_frontend = lgdt330x_get_frontend, .get_tune_settings = lgdt330x_get_tune_settings, .read_status = lgdt3302_read_status, .read_ber = lgdt330x_read_ber, .read_signal_strength = lgdt330x_read_signal_strength, .read_snr = lgdt3302_read_snr, .read_ucblocks = lgdt330x_read_ucblocks, .release = lgdt330x_release, }; static struct dvb_frontend_ops lgdt3303_ops = { .info = { .name= "LG Electronics LGDT3303 VSB/QAM Frontend", .type = FE_ATSC, .frequency_min= 54000000, .frequency_max= 858000000, .frequency_stepsize= 62500, .symbol_rate_min = 5056941, /* QAM 64 */ .symbol_rate_max = 10762000, /* VSB 8 */ .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB }, .init = lgdt330x_init, .set_frontend = lgdt330x_set_parameters, .get_frontend = lgdt330x_get_frontend, .get_tune_settings = lgdt330x_get_tune_settings, .read_status = lgdt3303_read_status, .read_ber = lgdt330x_read_ber, .read_signal_strength = lgdt330x_read_signal_strength, .read_snr = lgdt3303_read_snr, .read_ucblocks = lgdt330x_read_ucblocks, .release = lgdt330x_release, }; MODULE_DESCRIPTION("LGDT330X (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver"); MODULE_AUTHOR("Wilson Michaels"); MODULE_LICENSE("GPL"); EXPORT_SYMBOL(lgdt330x_attach); /* * Local variables: * c-basic-offset: 8 * End: */