/* * Rafael Micro R820T driver * * Copyright (C) 2013 Mauro Carvalho Chehab * * This driver was written from scratch, based on an existing driver * that it is part of rtl-sdr git tree, released under GPLv2: * https://groups.google.com/forum/#!topic/ultra-cheap-sdr/Y3rBEOFtHug * https://github.com/n1gp/gr-baz * * From what I understood from the threads, the original driver was converted * to userspace from a Realtek tree. I couldn't find the original tree. * However, the original driver look awkward on my eyes. So, I decided to * write a new version from it from the scratch, while trying to reproduce * everything found there. * * TODO: * After locking, the original driver seems to have some routines to * improve reception. This was not implemented here yet. * * RF Gain set/get is not implemented. * * 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. * */ #include #include #include #include "tuner-i2c.h" #include #include "r820t.h" /* * FIXME: I think that there are only 32 registers, but better safe than * sorry. After finishing the driver, we may review it. */ #define REG_SHADOW_START 5 #define NUM_REGS 27 #define VER_NUM 49 static int debug; module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "enable verbose debug messages"); /* * enums and structures */ enum xtal_cap_value { XTAL_LOW_CAP_30P = 0, XTAL_LOW_CAP_20P, XTAL_LOW_CAP_10P, XTAL_LOW_CAP_0P, XTAL_HIGH_CAP_0P }; struct r820t_priv { struct list_head hybrid_tuner_instance_list; const struct r820t_config *cfg; struct tuner_i2c_props i2c_props; struct mutex lock; u8 regs[NUM_REGS]; u8 buf[NUM_REGS + 1]; enum xtal_cap_value xtal_cap_sel; u16 pll; /* kHz */ u32 int_freq; u8 fil_cal_code; bool imr_done; /* Store current mode */ u32 delsys; enum v4l2_tuner_type type; v4l2_std_id std; u32 bw; /* in MHz */ bool has_lock; }; struct r820t_freq_range { u32 freq; u8 open_d; u8 rf_mux_ploy; u8 tf_c; u8 xtal_cap20p; u8 xtal_cap10p; u8 xtal_cap0p; u8 imr_mem; /* Not used, currently */ }; #define VCO_POWER_REF 0x02 /* * Static constants */ static LIST_HEAD(hybrid_tuner_instance_list); static DEFINE_MUTEX(r820t_list_mutex); /* Those initial values start from REG_SHADOW_START */ static const u8 r820t_init_array[NUM_REGS] = { 0x83, 0x32, 0x75, /* 05 to 07 */ 0xc0, 0x40, 0xd6, 0x6c, /* 08 to 0b */ 0xf5, 0x63, 0x75, 0x68, /* 0c to 0f */ 0x6c, 0x83, 0x80, 0x00, /* 10 to 13 */ 0x0f, 0x00, 0xc0, 0x30, /* 14 to 17 */ 0x48, 0xcc, 0x60, 0x00, /* 18 to 1b */ 0x54, 0xae, 0x4a, 0xc0 /* 1c to 1f */ }; /* Tuner frequency ranges */ static const struct r820t_freq_range freq_ranges[] = { { .freq = 0, .open_d = 0x08, /* low */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0xdf, /* R27[7:0] band2,band0 */ .xtal_cap20p = 0x02, /* R16[1:0] 20pF (10) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 50, /* Start freq, in MHz */ .open_d = 0x08, /* low */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0xbe, /* R27[7:0] band4,band1 */ .xtal_cap20p = 0x02, /* R16[1:0] 20pF (10) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 55, /* Start freq, in MHz */ .open_d = 0x08, /* low */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x8b, /* R27[7:0] band7,band4 */ .xtal_cap20p = 0x02, /* R16[1:0] 20pF (10) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 60, /* Start freq, in MHz */ .open_d = 0x08, /* low */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x7b, /* R27[7:0] band8,band4 */ .xtal_cap20p = 0x02, /* R16[1:0] 20pF (10) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 65, /* Start freq, in MHz */ .open_d = 0x08, /* low */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x69, /* R27[7:0] band9,band6 */ .xtal_cap20p = 0x02, /* R16[1:0] 20pF (10) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 70, /* Start freq, in MHz */ .open_d = 0x08, /* low */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x58, /* R27[7:0] band10,band7 */ .xtal_cap20p = 0x02, /* R16[1:0] 20pF (10) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 75, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x44, /* R27[7:0] band11,band11 */ .xtal_cap20p = 0x02, /* R16[1:0] 20pF (10) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 80, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x44, /* R27[7:0] band11,band11 */ .xtal_cap20p = 0x02, /* R16[1:0] 20pF (10) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 90, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x34, /* R27[7:0] band12,band11 */ .xtal_cap20p = 0x01, /* R16[1:0] 10pF (01) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 100, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x34, /* R27[7:0] band12,band11 */ .xtal_cap20p = 0x01, /* R16[1:0] 10pF (01) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 0, }, { .freq = 110, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x24, /* R27[7:0] band13,band11 */ .xtal_cap20p = 0x01, /* R16[1:0] 10pF (01) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 1, }, { .freq = 120, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x24, /* R27[7:0] band13,band11 */ .xtal_cap20p = 0x01, /* R16[1:0] 10pF (01) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 1, }, { .freq = 140, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x14, /* R27[7:0] band14,band11 */ .xtal_cap20p = 0x01, /* R16[1:0] 10pF (01) */ .xtal_cap10p = 0x01, .xtal_cap0p = 0x00, .imr_mem = 1, }, { .freq = 180, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x13, /* R27[7:0] band14,band12 */ .xtal_cap20p = 0x00, /* R16[1:0] 0pF (00) */ .xtal_cap10p = 0x00, .xtal_cap0p = 0x00, .imr_mem = 1, }, { .freq = 220, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x13, /* R27[7:0] band14,band12 */ .xtal_cap20p = 0x00, /* R16[1:0] 0pF (00) */ .xtal_cap10p = 0x00, .xtal_cap0p = 0x00, .imr_mem = 2, }, { .freq = 250, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x11, /* R27[7:0] highest,highest */ .xtal_cap20p = 0x00, /* R16[1:0] 0pF (00) */ .xtal_cap10p = 0x00, .xtal_cap0p = 0x00, .imr_mem = 2, }, { .freq = 280, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x02, /* R26[7:6]=0 (LPF) R26[1:0]=2 (low) */ .tf_c = 0x00, /* R27[7:0] highest,highest */ .xtal_cap20p = 0x00, /* R16[1:0] 0pF (00) */ .xtal_cap10p = 0x00, .xtal_cap0p = 0x00, .imr_mem = 2, }, { .freq = 310, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x41, /* R26[7:6]=1 (bypass) R26[1:0]=1 (middle) */ .tf_c = 0x00, /* R27[7:0] highest,highest */ .xtal_cap20p = 0x00, /* R16[1:0] 0pF (00) */ .xtal_cap10p = 0x00, .xtal_cap0p = 0x00, .imr_mem = 2, }, { .freq = 450, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x41, /* R26[7:6]=1 (bypass) R26[1:0]=1 (middle) */ .tf_c = 0x00, /* R27[7:0] highest,highest */ .xtal_cap20p = 0x00, /* R16[1:0] 0pF (00) */ .xtal_cap10p = 0x00, .xtal_cap0p = 0x00, .imr_mem = 3, }, { .freq = 588, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x40, /* R26[7:6]=1 (bypass) R26[1:0]=0 (highest) */ .tf_c = 0x00, /* R27[7:0] highest,highest */ .xtal_cap20p = 0x00, /* R16[1:0] 0pF (00) */ .xtal_cap10p = 0x00, .xtal_cap0p = 0x00, .imr_mem = 3, }, { .freq = 650, /* Start freq, in MHz */ .open_d = 0x00, /* high */ .rf_mux_ploy = 0x40, /* R26[7:6]=1 (bypass) R26[1:0]=0 (highest) */ .tf_c = 0x00, /* R27[7:0] highest,highest */ .xtal_cap20p = 0x00, /* R16[1:0] 0pF (00) */ .xtal_cap10p = 0x00, .xtal_cap0p = 0x00, .imr_mem = 4, } }; static int r820t_xtal_capacitor[][2] = { { 0x0b, XTAL_LOW_CAP_30P }, { 0x02, XTAL_LOW_CAP_20P }, { 0x01, XTAL_LOW_CAP_10P }, { 0x00, XTAL_LOW_CAP_0P }, { 0x10, XTAL_HIGH_CAP_0P }, }; /* * measured with a Racal 6103E GSM test set at 928 MHz with -60 dBm * input power, for raw results see: * http://steve-m.de/projects/rtl-sdr/gain_measurement/r820t/ */ static const int r820t_lna_gain_steps[] = { 0, 9, 13, 40, 38, 13, 31, 22, 26, 31, 26, 14, 19, 5, 35, 13 }; static const int r820t_mixer_gain_steps[] = { 0, 5, 10, 10, 19, 9, 10, 25, 17, 10, 8, 16, 13, 6, 3, -8 }; /* * I2C read/write code and shadow registers logic */ static void shadow_store(struct r820t_priv *priv, u8 reg, const u8 *val, int len) { int r = reg - REG_SHADOW_START; if (r < 0) { len += r; r = 0; } if (len <= 0) return; if (len > NUM_REGS) len = NUM_REGS; tuner_dbg("%s: prev reg=%02x len=%d: %*ph\n", __func__, r + REG_SHADOW_START, len, len, val); memcpy(&priv->regs[r], val, len); } static int r820t_write(struct r820t_priv *priv, u8 reg, const u8 *val, int len) { int rc, size, pos = 0; /* Store the shadow registers */ shadow_store(priv, reg, val, len); do { if (len > priv->cfg->max_i2c_msg_len - 1) size = priv->cfg->max_i2c_msg_len - 1; else size = len; /* Fill I2C buffer */ priv->buf[0] = reg; memcpy(&priv->buf[1], &val[pos], size); rc = tuner_i2c_xfer_send(&priv->i2c_props, priv->buf, size + 1); if (rc != size + 1) { tuner_info("%s: i2c wr failed=%d reg=%02x len=%d: %*ph\n", __func__, rc, reg, size, size, &priv->buf[1]); if (rc < 0) return rc; return -EREMOTEIO; } tuner_dbg("%s: i2c wr reg=%02x len=%d: %*ph\n", __func__, reg, size, size, &priv->buf[1]); reg += size; len -= size; pos += size; } while (len > 0); return 0; } static int r820t_write_reg(struct r820t_priv *priv, u8 reg, u8 val) { return r820t_write(priv, reg, &val, 1); } static int r820t_write_reg_mask(struct r820t_priv *priv, u8 reg, u8 val, u8 bit_mask) { int r = reg - REG_SHADOW_START; if (r >= 0 && r < NUM_REGS) val = (priv->regs[r] & ~bit_mask) | (val & bit_mask); else return -EINVAL; return r820t_write(priv, reg, &val, 1); } static int r820_read(struct r820t_priv *priv, u8 reg, u8 *val, int len) { int rc; u8 *p = &priv->buf[1]; priv->buf[0] = reg; rc = tuner_i2c_xfer_send_recv(&priv->i2c_props, priv->buf, 1, p, len); if (rc != len) { tuner_info("%s: i2c rd failed=%d reg=%02x len=%d: %*ph\n", __func__, rc, reg, len, len, p); if (rc < 0) return rc; return -EREMOTEIO; } tuner_dbg("%s: i2c rd reg=%02x len=%d: %*ph\n", __func__, reg, len, len, p); /* Copy data to the output buffer */ memcpy(val, p, len); return 0; } /* * r820t tuning logic */ static int r820t_set_mux(struct r820t_priv *priv, u32 freq) { const struct r820t_freq_range *range; int i, rc; u8 val; /* Get the proper frequency range */ freq = freq / 1000000; for (i = 0; i < ARRAY_SIZE(freq_ranges) - 1; i++) { if (freq < freq_ranges[i + 1].freq) break; } range = &freq_ranges[i]; tuner_dbg("set r820t range#%d for frequency %d MHz\n", i, freq); /* Open Drain */ rc = r820t_write_reg_mask(priv, 0x17, range->open_d, 0x08); if (rc < 0) return rc; /* RF_MUX,Polymux */ rc = r820t_write_reg_mask(priv, 0x1a, range->rf_mux_ploy, 0xc3); if (rc < 0) return rc; /* TF BAND */ rc = r820t_write_reg(priv, 0x1b, range->tf_c); if (rc < 0) return rc; /* XTAL CAP & Drive */ switch (priv->xtal_cap_sel) { case XTAL_LOW_CAP_30P: case XTAL_LOW_CAP_20P: val = range->xtal_cap20p | 0x08; break; case XTAL_LOW_CAP_10P: val = range->xtal_cap10p | 0x08; break; case XTAL_HIGH_CAP_0P: val = range->xtal_cap0p | 0x00; break; default: case XTAL_LOW_CAP_0P: val = range->xtal_cap0p | 0x08; break; } rc = r820t_write_reg_mask(priv, 0x10, val, 0x0b); if (rc < 0) return rc; /* * FIXME: the original driver has a logic there with preserves * gain/phase from registers 8 and 9 reading the data from the * registers before writing, if "IMF done". That code was sort of * commented there, as the flag is always false. */ rc = r820t_write_reg_mask(priv, 0x08, 0, 0x3f); if (rc < 0) return rc; rc = r820t_write_reg_mask(priv, 0x09, 0, 0x3f); return rc; } static int r820t_set_pll(struct r820t_priv *priv, u32 freq) { u64 tmp64, vco_freq; int rc, i; u32 vco_fra; /* VCO contribution by SDM (kHz) */ u32 vco_min = 1770000; u32 vco_max = vco_min * 2; u32 pll_ref; u16 n_sdm = 2; u16 sdm = 0; u8 mix_div = 2; u8 div_buf = 0; u8 div_num = 0; u8 ni, si, nint, vco_fine_tune, val; u8 data[5]; freq = freq / 1000; /* Frequency in kHz */ pll_ref = priv->cfg->xtal / 1000; tuner_dbg("set r820t pll for frequency %d kHz = %d\n", freq, pll_ref); /* FIXME: this seems to be a hack - probably it can be removed */ rc = r820t_write_reg_mask(priv, 0x10, 0x00, 0x00); if (rc < 0) return rc; /* set pll autotune = 128kHz */ rc = r820t_write_reg_mask(priv, 0x1a, 0x00, 0x0c); if (rc < 0) return rc; /* set VCO current = 100 */ rc = r820t_write_reg_mask(priv, 0x12, 0x80, 0xe0); if (rc < 0) return rc; /* Calculate divider */ while (mix_div <= 64) { if (((freq * mix_div) >= vco_min) && ((freq * mix_div) < vco_max)) { div_buf = mix_div; while (div_buf > 2) { div_buf = div_buf >> 1; div_num++; } break; } mix_div = mix_div << 1; } rc = r820_read(priv, 0x00, data, sizeof(data)); if (rc < 0) return rc; vco_fine_tune = (data[4] & 0x30) >> 4; if (vco_fine_tune > VCO_POWER_REF) div_num = div_num - 1; else if (vco_fine_tune < VCO_POWER_REF) div_num = div_num + 1; rc = r820t_write_reg_mask(priv, 0x10, div_num << 5, 0xe0); if (rc < 0) return rc; vco_freq = (u64)(freq * (u64)mix_div); tmp64 = vco_freq; do_div(tmp64, 2 * pll_ref); nint = (u8)tmp64; tmp64 = vco_freq - ((u64)2) * pll_ref * nint; do_div(tmp64, 1000); vco_fra = (u16)(tmp64); pll_ref /= 1000; /* boundary spur prevention */ if (vco_fra < pll_ref / 64) { vco_fra = 0; } else if (vco_fra > pll_ref * 127 / 64) { vco_fra = 0; nint++; } else if ((vco_fra > pll_ref * 127 / 128) && (vco_fra < pll_ref)) { vco_fra = pll_ref * 127 / 128; } else if ((vco_fra > pll_ref) && (vco_fra < pll_ref * 129 / 128)) { vco_fra = pll_ref * 129 / 128; } if (nint > 63) { tuner_info("No valid PLL values for %u kHz!\n", freq); return -EINVAL; } ni = (nint - 13) / 4; si = nint - 4 * ni - 13; rc = r820t_write_reg(priv, 0x14, ni + (si << 6)); if (rc < 0) return rc; /* pw_sdm */ if (!vco_fra) val = 0x08; else val = 0x00; rc = r820t_write_reg_mask(priv, 0x12, val, 0x08); if (rc < 0) return rc; /* sdm calculator */ while (vco_fra > 1) { if (vco_fra > (2 * pll_ref / n_sdm)) { sdm = sdm + 32768 / (n_sdm / 2); vco_fra = vco_fra - 2 * pll_ref / n_sdm; if (n_sdm >= 0x8000) break; } n_sdm = n_sdm << 1; } rc = r820t_write_reg_mask(priv, 0x16, sdm >> 8, 0x08); if (rc < 0) return rc; rc = r820t_write_reg_mask(priv, 0x15, sdm & 0xff, 0x08); if (rc < 0) return rc; for (i = 0; i < 2; i++) { /* * FIXME: Rafael chips R620D, R828D and R828 seems to * need 20 ms for analog TV */ msleep(10); /* Check if PLL has locked */ rc = r820_read(priv, 0x00, data, 3); if (rc < 0) return rc; if (data[2] & 0x40) break; if (!i) { /* Didn't lock. Increase VCO current */ rc = r820t_write_reg_mask(priv, 0x12, 0x60, 0xe0); if (rc < 0) return rc; } } if (!(data[2] & 0x40)) { priv->has_lock = false; return 0; } priv->has_lock = true; tuner_dbg("tuner has lock at frequency %d kHz\n", freq); /* set pll autotune = 8kHz */ rc = r820t_write_reg_mask(priv, 0x1a, 0x08, 0x08); return rc; } static int r820t_sysfreq_sel(struct r820t_priv *priv, u32 freq, enum v4l2_tuner_type type, v4l2_std_id std, u32 delsys) { int rc; u8 mixer_top, lna_top, cp_cur, div_buf_cur, lna_vth_l, mixer_vth_l; u8 air_cable1_in, cable2_in, pre_dect, lna_discharge, filter_cur; tuner_dbg("adjusting tuner parameters for the standard\n"); switch (delsys) { case SYS_DVBT: if ((freq == 506000000) || (freq == 666000000) || (freq == 818000000)) { mixer_top = 0x14; /* mixer top:14 , top-1, low-discharge */ lna_top = 0xe5; /* detect bw 3, lna top:4, predet top:2 */ cp_cur = 0x28; /* 101, 0.2 */ div_buf_cur = 0x20; /* 10, 200u */ } else { mixer_top = 0x24; /* mixer top:13 , top-1, low-discharge */ lna_top = 0xe5; /* detect bw 3, lna top:4, predet top:2 */ cp_cur = 0x38; /* 111, auto */ div_buf_cur = 0x30; /* 11, 150u */ } lna_vth_l = 0x53; /* lna vth 0.84 , vtl 0.64 */ mixer_vth_l = 0x75; /* mixer vth 1.04, vtl 0.84 */ air_cable1_in = 0x00; cable2_in = 0x00; pre_dect = 0x40; lna_discharge = 14; filter_cur = 0x40; /* 10, low */ break; case SYS_DVBT2: mixer_top = 0x24; /* mixer top:13 , top-1, low-discharge */ lna_top = 0xe5; /* detect bw 3, lna top:4, predet top:2 */ lna_vth_l = 0x53; /* lna vth 0.84 , vtl 0.64 */ mixer_vth_l = 0x75; /* mixer vth 1.04, vtl 0.84 */ air_cable1_in = 0x00; cable2_in = 0x00; pre_dect = 0x40; lna_discharge = 14; cp_cur = 0x38; /* 111, auto */ div_buf_cur = 0x30; /* 11, 150u */ filter_cur = 0x40; /* 10, low */ break; case SYS_ISDBT: mixer_top = 0x24; /* mixer top:13 , top-1, low-discharge */ lna_top = 0xe5; /* detect bw 3, lna top:4, predet top:2 */ lna_vth_l = 0x75; /* lna vth 1.04 , vtl 0.84 */ mixer_vth_l = 0x75; /* mixer vth 1.04, vtl 0.84 */ air_cable1_in = 0x00; cable2_in = 0x00; pre_dect = 0x40; lna_discharge = 14; cp_cur = 0x38; /* 111, auto */ div_buf_cur = 0x30; /* 11, 150u */ filter_cur = 0x40; /* 10, low */ break; default: /* DVB-T 8M */ mixer_top = 0x24; /* mixer top:13 , top-1, low-discharge */ lna_top = 0xe5; /* detect bw 3, lna top:4, predet top:2 */ lna_vth_l = 0x53; /* lna vth 0.84 , vtl 0.64 */ mixer_vth_l = 0x75; /* mixer vth 1.04, vtl 0.84 */ air_cable1_in = 0x00; cable2_in = 0x00; pre_dect = 0x40; lna_discharge = 14; cp_cur = 0x38; /* 111, auto */ div_buf_cur = 0x30; /* 11, 150u */ filter_cur = 0x40; /* 10, low */ break; } rc = r820t_write_reg_mask(priv, 0x1d, lna_top, 0xc7); if (rc < 0) return rc; rc = r820t_write_reg_mask(priv, 0x1c, mixer_top, 0xf8); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x0d, lna_vth_l); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x0e, mixer_vth_l); if (rc < 0) return rc; /* Air-IN only for Astrometa */ rc = r820t_write_reg_mask(priv, 0x05, air_cable1_in, 0x60); if (rc < 0) return rc; rc = r820t_write_reg_mask(priv, 0x06, cable2_in, 0x08); if (rc < 0) return rc; rc = r820t_write_reg_mask(priv, 0x11, cp_cur, 0x38); if (rc < 0) return rc; rc = r820t_write_reg_mask(priv, 0x17, div_buf_cur, 0x30); if (rc < 0) return rc; rc = r820t_write_reg_mask(priv, 0x0a, filter_cur, 0x60); if (rc < 0) return rc; /* * Original driver initializes regs 0x05 and 0x06 with the * same value again on this point. Probably, it is just an * error there */ /* * Set LNA */ tuner_dbg("adjusting LNA parameters\n"); if (type != V4L2_TUNER_ANALOG_TV) { /* LNA TOP: lowest */ rc = r820t_write_reg_mask(priv, 0x1d, 0, 0x38); if (rc < 0) return rc; /* 0: normal mode */ rc = r820t_write_reg_mask(priv, 0x1c, 0, 0x04); if (rc < 0) return rc; /* 0: PRE_DECT off */ rc = r820t_write_reg_mask(priv, 0x06, 0, 0x40); if (rc < 0) return rc; /* agc clk 250hz */ rc = r820t_write_reg_mask(priv, 0x1a, 0x30, 0x30); if (rc < 0) return rc; msleep(250); /* write LNA TOP = 3 */ rc = r820t_write_reg_mask(priv, 0x1d, 0x18, 0x38); if (rc < 0) return rc; /* * write discharge mode * FIXME: IMHO, the mask here is wrong, but it matches * what's there at the original driver */ rc = r820t_write_reg_mask(priv, 0x1c, mixer_top, 0x04); if (rc < 0) return rc; /* LNA discharge current */ rc = r820t_write_reg_mask(priv, 0x1e, lna_discharge, 0x1f); if (rc < 0) return rc; /* agc clk 60hz */ rc = r820t_write_reg_mask(priv, 0x1a, 0x20, 0x30); if (rc < 0) return rc; } else { /* PRE_DECT off */ rc = r820t_write_reg_mask(priv, 0x06, 0, 0x40); if (rc < 0) return rc; /* write LNA TOP */ rc = r820t_write_reg_mask(priv, 0x1d, lna_top, 0x38); if (rc < 0) return rc; /* * write discharge mode * FIXME: IMHO, the mask here is wrong, but it matches * what's there at the original driver */ rc = r820t_write_reg_mask(priv, 0x1c, mixer_top, 0x04); if (rc < 0) return rc; /* LNA discharge current */ rc = r820t_write_reg_mask(priv, 0x1e, lna_discharge, 0x1f); if (rc < 0) return rc; /* agc clk 1Khz, external det1 cap 1u */ rc = r820t_write_reg_mask(priv, 0x1a, 0x00, 0x30); if (rc < 0) return rc; rc = r820t_write_reg_mask(priv, 0x10, 0x00, 0x04); if (rc < 0) return rc; } return 0; } static int r820t_set_tv_standard(struct r820t_priv *priv, unsigned bw, enum v4l2_tuner_type type, v4l2_std_id std, u32 delsys) { int rc, i; u32 if_khz, filt_cal_lo; u8 data[5], val; u8 filt_gain, img_r, filt_q, hp_cor, ext_enable, loop_through; u8 lt_att, flt_ext_widest, polyfil_cur; bool need_calibration; tuner_dbg("selecting the delivery system\n"); if (delsys == SYS_ISDBT) { if_khz = 4063; filt_cal_lo = 59000; filt_gain = 0x10; /* +3db, 6mhz on */ img_r = 0x00; /* image negative */ filt_q = 0x10; /* r10[4]:low q(1'b1) */ hp_cor = 0x6a; /* 1.7m disable, +2cap, 1.25mhz */ ext_enable = 0x40; /* r30[6], ext enable; r30[5]:0 ext at lna max */ loop_through = 0x00; /* r5[7], lt on */ lt_att = 0x00; /* r31[7], lt att enable */ flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */ polyfil_cur = 0x60; /* r25[6:5]:min */ } else { if (bw <= 6) { if_khz = 3570; filt_cal_lo = 56000; /* 52000->56000 */ filt_gain = 0x10; /* +3db, 6mhz on */ img_r = 0x00; /* image negative */ filt_q = 0x10; /* r10[4]:low q(1'b1) */ hp_cor = 0x6b; /* 1.7m disable, +2cap, 1.0mhz */ ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */ loop_through = 0x00; /* r5[7], lt on */ lt_att = 0x00; /* r31[7], lt att enable */ flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */ polyfil_cur = 0x60; /* r25[6:5]:min */ } else if (bw == 7) { if_khz = 4070; filt_cal_lo = 60000; filt_gain = 0x10; /* +3db, 6mhz on */ img_r = 0x00; /* image negative */ filt_q = 0x10; /* r10[4]:low q(1'b1) */ hp_cor = 0x2b; /* 1.7m disable, +1cap, 1.0mhz */ ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */ loop_through = 0x00; /* r5[7], lt on */ lt_att = 0x00; /* r31[7], lt att enable */ flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */ polyfil_cur = 0x60; /* r25[6:5]:min */ #if 0 /* 7 MHz type 2 - nor sure why/where this is used - Perhaps Australia? */ if_khz = 4570; filt_cal_lo = 63000; filt_gain = 0x10; /* +3db, 6mhz on */ img_r = 0x00; /* image negative */ filt_q = 0x10; /* r10[4]:low q(1'b1) */ hp_cor = 0x2a; /* 1.7m disable, +1cap, 1.25mhz */ ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */ loop_through = 0x00; /* r5[7], lt on */ lt_att = 0x00; /* r31[7], lt att enable */ flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */ polyfil_cur = 0x60; /* r25[6:5]:min */ #endif } else { if_khz = 4570; filt_cal_lo = 68500; filt_gain = 0x10; /* +3db, 6mhz on */ img_r = 0x00; /* image negative */ filt_q = 0x10; /* r10[4]:low q(1'b1) */ hp_cor = 0x0b; /* 1.7m disable, +0cap, 1.0mhz */ ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */ loop_through = 0x00; /* r5[7], lt on */ lt_att = 0x00; /* r31[7], lt att enable */ flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */ polyfil_cur = 0x60; /* r25[6:5]:min */ } } /* Initialize the shadow registers */ memcpy(priv->regs, r820t_init_array, sizeof(r820t_init_array)); /* Init Flag & Xtal_check Result */ if (priv->imr_done) val = 1 | priv->xtal_cap_sel << 1; else val = 0; rc = r820t_write_reg_mask(priv, 0x0c, val, 0x0f); if (rc < 0) return rc; /* version */ rc = r820t_write_reg_mask(priv, 0x13, VER_NUM, 0x3f); if (rc < 0) return rc; /* for LT Gain test */ if (type != V4L2_TUNER_ANALOG_TV) { rc = r820t_write_reg_mask(priv, 0x1d, 0x00, 0x38); if (rc < 0) return rc; msleep(1); } priv->int_freq = if_khz; /* Check if standard changed. If so, filter calibration is needed */ if (type != priv->type) need_calibration = true; else if ((type == V4L2_TUNER_ANALOG_TV) && (std != priv->std)) need_calibration = true; else if ((type == V4L2_TUNER_DIGITAL_TV) && ((delsys != priv->delsys) || bw != priv->bw)) need_calibration = true; else need_calibration = false; if (need_calibration) { tuner_dbg("calibrating the tuner\n"); for (i = 0; i < 2; i++) { /* Set filt_cap */ rc = r820t_write_reg_mask(priv, 0x0b, hp_cor, 0x60); if (rc < 0) return rc; /* set cali clk =on */ rc = r820t_write_reg_mask(priv, 0x0f, 0x04, 0x04); if (rc < 0) return rc; /* X'tal cap 0pF for PLL */ rc = r820t_write_reg_mask(priv, 0x10, 0x00, 0x03); if (rc < 0) return rc; rc = r820t_set_pll(priv, filt_cal_lo); if (rc < 0 || !priv->has_lock) return rc; /* Start Trigger */ rc = r820t_write_reg_mask(priv, 0x0b, 0x10, 0x10); if (rc < 0) return rc; msleep(1); /* Stop Trigger */ rc = r820t_write_reg_mask(priv, 0x0b, 0x00, 0x10); if (rc < 0) return rc; /* set cali clk =off */ rc = r820t_write_reg_mask(priv, 0x0f, 0x00, 0x04); if (rc < 0) return rc; /* Check if calibration worked */ rc = r820_read(priv, 0x00, data, sizeof(data)); if (rc < 0) return rc; priv->fil_cal_code = data[4] & 0x0f; if (priv->fil_cal_code && priv->fil_cal_code != 0x0f) break; } /* narrowest */ if (priv->fil_cal_code == 0x0f) priv->fil_cal_code = 0; } rc = r820t_write_reg_mask(priv, 0x0a, filt_q | priv->fil_cal_code, 0x1f); if (rc < 0) return rc; /* Set BW, Filter_gain, & HP corner */ rc = r820t_write_reg_mask(priv, 0x0b, hp_cor, 0x10); if (rc < 0) return rc; /* Set Img_R */ rc = r820t_write_reg_mask(priv, 0x07, img_r, 0x80); if (rc < 0) return rc; /* Set filt_3dB, V6MHz */ rc = r820t_write_reg_mask(priv, 0x06, filt_gain, 0x30); if (rc < 0) return rc; /* channel filter extension */ rc = r820t_write_reg_mask(priv, 0x1e, ext_enable, 0x60); if (rc < 0) return rc; /* Loop through */ rc = r820t_write_reg_mask(priv, 0x05, loop_through, 0x80); if (rc < 0) return rc; /* Loop through attenuation */ rc = r820t_write_reg_mask(priv, 0x1f, lt_att, 0x80); if (rc < 0) return rc; /* filter extension widest */ rc = r820t_write_reg_mask(priv, 0x0f, flt_ext_widest, 0x80); if (rc < 0) return rc; /* RF poly filter current */ rc = r820t_write_reg_mask(priv, 0x19, polyfil_cur, 0x60); if (rc < 0) return rc; /* Store current standard. If it changes, re-calibrate the tuner */ priv->delsys = delsys; priv->type = type; priv->std = std; priv->bw = bw; return 0; } static int r820t_read_gain(struct r820t_priv *priv) { u8 data[4]; int rc; rc = r820_read(priv, 0x00, data, sizeof(data)); if (rc < 0) return rc; return ((data[3] & 0x0f) << 1) + ((data[3] & 0xf0) >> 4); } static int r820t_set_gain_mode(struct r820t_priv *priv, bool set_manual_gain, int gain) { int rc; if (set_manual_gain) { int i, total_gain = 0; uint8_t mix_index = 0, lna_index = 0; u8 data[4]; /* LNA auto off */ rc = r820t_write_reg_mask(priv, 0x05, 0x10, 0x10); if (rc < 0) return rc; /* Mixer auto off */ rc = r820t_write_reg_mask(priv, 0x07, 0, 0x10); if (rc < 0) return rc; rc = r820_read(priv, 0x00, data, sizeof(data)); if (rc < 0) return rc; /* set fixed VGA gain for now (16.3 dB) */ rc = r820t_write_reg_mask(priv, 0x0c, 0x08, 0x9f); if (rc < 0) return rc; for (i = 0; i < 15; i++) { if (total_gain >= gain) break; total_gain += r820t_lna_gain_steps[++lna_index]; if (total_gain >= gain) break; total_gain += r820t_mixer_gain_steps[++mix_index]; } /* set LNA gain */ rc = r820t_write_reg_mask(priv, 0x05, lna_index, 0x0f); if (rc < 0) return rc; /* set Mixer gain */ rc = r820t_write_reg_mask(priv, 0x07, mix_index, 0x0f); if (rc < 0) return rc; } else { /* LNA */ rc = r820t_write_reg_mask(priv, 0x05, 0, 0xef); if (rc < 0) return rc; /* Mixer */ rc = r820t_write_reg_mask(priv, 0x07, 0x10, 0xef); if (rc < 0) return rc; /* set fixed VGA gain for now (26.5 dB) */ rc = r820t_write_reg_mask(priv, 0x0c, 0x0b, 0x9f); if (rc < 0) return rc; } return 0; } static int generic_set_freq(struct dvb_frontend *fe, u32 freq /* in HZ */, unsigned bw, enum v4l2_tuner_type type, v4l2_std_id std, u32 delsys) { struct r820t_priv *priv = fe->tuner_priv; int rc = -EINVAL; u32 lo_freq; tuner_dbg("should set frequency to %d kHz, bw %d MHz\n", freq / 1000, bw); if ((type == V4L2_TUNER_ANALOG_TV) && (std == V4L2_STD_SECAM_LC)) lo_freq = freq - priv->int_freq; else lo_freq = freq + priv->int_freq; rc = r820t_set_tv_standard(priv, bw, type, std, delsys); if (rc < 0) goto err; rc = r820t_set_mux(priv, lo_freq); if (rc < 0) goto err; rc = r820t_set_gain_mode(priv, true, 0); if (rc < 0) goto err; rc = r820t_set_pll(priv, lo_freq); if (rc < 0 || !priv->has_lock) goto err; rc = r820t_sysfreq_sel(priv, freq, type, std, delsys); if (rc < 0) goto err; tuner_dbg("%s: PLL locked on frequency %d Hz, gain=%d\n", __func__, freq, r820t_read_gain(priv)); err: if (rc < 0) tuner_dbg("%s: failed=%d\n", __func__, rc); return rc; } /* * r820t standby logic */ static int r820t_standby(struct r820t_priv *priv) { int rc; rc = r820t_write_reg(priv, 0x06, 0xb1); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x05, 0x03); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x07, 0x3a); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x08, 0x40); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x09, 0xc0); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x0a, 0x36); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x0c, 0x35); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x0f, 0x68); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x11, 0x03); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x17, 0xf4); if (rc < 0) return rc; rc = r820t_write_reg(priv, 0x19, 0x0c); /* Force initial calibration */ priv->type = -1; return rc; } /* * r820t device init logic */ static int r820t_xtal_check(struct r820t_priv *priv) { int rc, i; u8 data[3], val; /* Initialize the shadow registers */ memcpy(priv->regs, r820t_init_array, sizeof(r820t_init_array)); /* cap 30pF & Drive Low */ rc = r820t_write_reg_mask(priv, 0x10, 0x0b, 0x0b); if (rc < 0) return rc; /* set pll autotune = 128kHz */ rc = r820t_write_reg_mask(priv, 0x1a, 0x00, 0x0c); if (rc < 0) return rc; /* set manual initial reg = 111111; */ rc = r820t_write_reg_mask(priv, 0x13, 0x7f, 0x7f); if (rc < 0) return rc; /* set auto */ rc = r820t_write_reg_mask(priv, 0x13, 0x00, 0x40); if (rc < 0) return rc; /* Try several xtal capacitor alternatives */ for (i = 0; i < ARRAY_SIZE(r820t_xtal_capacitor); i++) { rc = r820t_write_reg_mask(priv, 0x10, r820t_xtal_capacitor[i][0], 0x1b); if (rc < 0) return rc; msleep(5); rc = r820_read(priv, 0x00, data, sizeof(data)); if (rc < 0) return rc; if ((!data[2]) & 0x40) continue; val = data[2] & 0x3f; if (priv->cfg->xtal == 16000000 && (val > 29 || val < 23)) break; if (val != 0x3f) break; } if (i == ARRAY_SIZE(r820t_xtal_capacitor)) return -EINVAL; return r820t_xtal_capacitor[i][1]; } /* * r820t frontend operations and tuner attach code * * All driver locks and i2c control are only in this part of the code */ static int r820t_init(struct dvb_frontend *fe) { struct r820t_priv *priv = fe->tuner_priv; int rc, i; int xtal_cap = 0; tuner_dbg("%s:\n", __func__); mutex_lock(&priv->lock); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); if ((priv->cfg->rafael_chip == CHIP_R820T) || (priv->cfg->rafael_chip == CHIP_R828S) || (priv->cfg->rafael_chip == CHIP_R820C)) { priv->xtal_cap_sel = XTAL_HIGH_CAP_0P; } else { for (i = 0; i < 3; i++) { rc = r820t_xtal_check(priv); if (rc < 0) goto err; if (!i || rc > xtal_cap) xtal_cap = rc; } priv->xtal_cap_sel = xtal_cap; } /* Initialize registers */ rc = r820t_write(priv, 0x05, r820t_init_array, sizeof(r820t_init_array)); err: if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); mutex_unlock(&priv->lock); if (rc < 0) tuner_dbg("%s: failed=%d\n", __func__, rc); return rc; } static int r820t_sleep(struct dvb_frontend *fe) { struct r820t_priv *priv = fe->tuner_priv; int rc; tuner_dbg("%s:\n", __func__); mutex_lock(&priv->lock); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); rc = r820t_standby(priv); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); mutex_unlock(&priv->lock); tuner_dbg("%s: failed=%d\n", __func__, rc); return rc; } static int r820t_set_analog_freq(struct dvb_frontend *fe, struct analog_parameters *p) { struct r820t_priv *priv = fe->tuner_priv; unsigned bw; int rc; tuner_dbg("%s called\n", __func__); /* if std is not defined, choose one */ if (!p->std) p->std = V4L2_STD_MN; if ((p->std == V4L2_STD_PAL_M) || (p->std == V4L2_STD_NTSC)) bw = 6; else bw = 8; mutex_lock(&priv->lock); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); rc = generic_set_freq(fe, 62500l * p->frequency, bw, V4L2_TUNER_ANALOG_TV, p->std, SYS_UNDEFINED); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); mutex_unlock(&priv->lock); return rc; } static int r820t_set_params(struct dvb_frontend *fe) { struct r820t_priv *priv = fe->tuner_priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; int rc; unsigned bw; tuner_dbg("%s: delivery_system=%d frequency=%d bandwidth_hz=%d\n", __func__, c->delivery_system, c->frequency, c->bandwidth_hz); mutex_lock(&priv->lock); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); bw = (c->bandwidth_hz + 500000) / 1000000; if (!bw) bw = 8; rc = generic_set_freq(fe, c->frequency, bw, V4L2_TUNER_DIGITAL_TV, 0, c->delivery_system); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); mutex_unlock(&priv->lock); if (rc) tuner_dbg("%s: failed=%d\n", __func__, rc); return rc; } static int r820t_signal(struct dvb_frontend *fe, u16 *strength) { struct r820t_priv *priv = fe->tuner_priv; int rc = 0; mutex_lock(&priv->lock); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); if (priv->has_lock) { rc = r820t_read_gain(priv); if (rc < 0) goto err; /* A higher gain at LNA means a lower signal strength */ *strength = (45 - rc) << 4 | 0xff; } else { *strength = 0; } err: if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); mutex_unlock(&priv->lock); tuner_dbg("%s: %s, gain=%d strength=%d\n", __func__, priv->has_lock ? "PLL locked" : "no signal", rc, *strength); return 0; } static int r820t_get_if_frequency(struct dvb_frontend *fe, u32 *frequency) { struct r820t_priv *priv = fe->tuner_priv; tuner_dbg("%s:\n", __func__); *frequency = priv->int_freq; return 0; } static int r820t_release(struct dvb_frontend *fe) { struct r820t_priv *priv = fe->tuner_priv; tuner_dbg("%s:\n", __func__); mutex_lock(&r820t_list_mutex); if (priv) hybrid_tuner_release_state(priv); mutex_unlock(&r820t_list_mutex); fe->tuner_priv = NULL; kfree(fe->tuner_priv); return 0; } static const struct dvb_tuner_ops r820t_tuner_ops = { .info = { .name = "Rafael Micro R820T", .frequency_min = 42000000, .frequency_max = 1002000000, }, .init = r820t_init, .release = r820t_release, .sleep = r820t_sleep, .set_params = r820t_set_params, .set_analog_params = r820t_set_analog_freq, .get_if_frequency = r820t_get_if_frequency, .get_rf_strength = r820t_signal, }; struct dvb_frontend *r820t_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, const struct r820t_config *cfg) { struct r820t_priv *priv; int rc = -ENODEV; u8 data[5]; int instance; mutex_lock(&r820t_list_mutex); instance = hybrid_tuner_request_state(struct r820t_priv, priv, hybrid_tuner_instance_list, i2c, cfg->i2c_addr, "r820t"); switch (instance) { case 0: /* memory allocation failure */ goto err_no_gate; break; case 1: /* new tuner instance */ priv->cfg = cfg; mutex_init(&priv->lock); fe->tuner_priv = priv; break; case 2: /* existing tuner instance */ fe->tuner_priv = priv; break; } memcpy(&fe->ops.tuner_ops, &r820t_tuner_ops, sizeof(r820t_tuner_ops)); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); /* check if the tuner is there */ rc = r820_read(priv, 0x00, data, sizeof(data)); if (rc < 0) goto err; rc = r820t_sleep(fe); if (rc < 0) goto err; tuner_info("Rafael Micro r820t successfully identified\n"); fe->tuner_priv = priv; memcpy(&fe->ops.tuner_ops, &r820t_tuner_ops, sizeof(struct dvb_tuner_ops)); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); mutex_unlock(&r820t_list_mutex); return fe; err: if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); err_no_gate: mutex_unlock(&r820t_list_mutex); tuner_info("%s: failed=%d\n", __func__, rc); r820t_release(fe); return NULL; } EXPORT_SYMBOL_GPL(r820t_attach); MODULE_DESCRIPTION("Rafael Micro r820t silicon tuner driver"); MODULE_AUTHOR("Mauro Carvalho Chehab "); MODULE_LICENSE("GPL");