// SPDX-License-Identifier: GPL-2.0 // 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. #define pr_fmt(fmt) … #include <linux/videodev2.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/bitrev.h> #include "tuner-i2c.h" #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 … #define NUM_REGS … #define NUM_IMR … #define IMR_TRIAL … #define VER_NUM … static int debug; module_param(debug, int, 0644); MODULE_PARM_DESC(…) …; static int no_imr_cal; module_param(no_imr_cal, int, 0444); MODULE_PARM_DESC(…) …; /* * enums and structures */ enum xtal_cap_value { … }; struct r820t_sect_type { … }; struct r820t_priv { … }; struct r820t_freq_range { … }; #define VCO_POWER_REF … #define DIP_FREQ … /* * 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] = …; /* Tuner frequency ranges */ static const struct r820t_freq_range freq_ranges[] = …; static int r820t_xtal_capacitor[][2] = …; static const char *r820t_chip_enum_to_str(enum r820t_chip chip) { … } /* * I2C read/write code and shadow registers logic */ static void shadow_store(struct r820t_priv *priv, u8 reg, const u8 *val, int len) { … } static int r820t_write(struct r820t_priv *priv, u8 reg, const u8 *val, int len) { … } static inline int r820t_write_reg(struct r820t_priv *priv, u8 reg, u8 val) { … } static int r820t_read_cache_reg(struct r820t_priv *priv, int reg) { … } static inline int r820t_write_reg_mask(struct r820t_priv *priv, u8 reg, u8 val, u8 bit_mask) { … } static int r820t_read(struct r820t_priv *priv, u8 reg, u8 *val, int len) { … } /* * r820t tuning logic */ static int r820t_set_mux(struct r820t_priv *priv, u32 freq) { … } static int r820t_set_pll(struct r820t_priv *priv, enum v4l2_tuner_type type, u32 freq) { … } static int r820t_sysfreq_sel(struct r820t_priv *priv, u32 freq, enum v4l2_tuner_type type, v4l2_std_id std, u32 delsys) { … } static int r820t_set_tv_standard(struct r820t_priv *priv, unsigned bw, enum v4l2_tuner_type type, v4l2_std_id std, u32 delsys) { … } static int r820t_read_gain(struct r820t_priv *priv) { … } #if 0 /* FIXME: This routine requires more testing */ /* * 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 }; 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 = r820t_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, 0x10); if (rc < 0) return rc; /* Mixer */ rc = r820t_write_reg_mask(priv, 0x07, 0x10, 0x10); 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; } #endif 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) { … } /* * r820t standby logic */ static int r820t_standby(struct r820t_priv *priv) { … } /* * r820t device init logic */ static int r820t_xtal_check(struct r820t_priv *priv) { … } static int r820t_imr_prepare(struct r820t_priv *priv) { … } static int r820t_multi_read(struct r820t_priv *priv) { … } static int r820t_imr_cross(struct r820t_priv *priv, struct r820t_sect_type iq_point[3], u8 *x_direct) { … } static void r820t_compre_cor(struct r820t_sect_type iq[3]) { … } static int r820t_compre_step(struct r820t_priv *priv, struct r820t_sect_type iq[3], u8 reg) { … } static int r820t_iq_tree(struct r820t_priv *priv, struct r820t_sect_type iq[3], u8 fix_val, u8 var_val, u8 fix_reg) { … } static int r820t_section(struct r820t_priv *priv, struct r820t_sect_type *iq_point) { … } static int r820t_vga_adjust(struct r820t_priv *priv) { … } static int r820t_iq(struct r820t_priv *priv, struct r820t_sect_type *iq_pont) { … } static int r820t_f_imr(struct r820t_priv *priv, struct r820t_sect_type *iq_pont) { … } static int r820t_imr(struct r820t_priv *priv, unsigned imr_mem, bool im_flag) { … } static int r820t_imr_callibrate(struct r820t_priv *priv) { … } #if 0 /* Not used, for now */ static int r820t_gpio(struct r820t_priv *priv, bool enable) { return r820t_write_reg_mask(priv, 0x0f, enable ? 1 : 0, 0x01); } #endif /* * 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) { … } static int r820t_sleep(struct dvb_frontend *fe) { … } static int r820t_set_analog_freq(struct dvb_frontend *fe, struct analog_parameters *p) { … } static int r820t_set_params(struct dvb_frontend *fe) { … } static int r820t_signal(struct dvb_frontend *fe, u16 *strength) { … } static int r820t_get_if_frequency(struct dvb_frontend *fe, u32 *frequency) { … } static void r820t_release(struct dvb_frontend *fe) { … } static const struct dvb_tuner_ops r820t_tuner_ops = …; struct dvb_frontend *r820t_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, const struct r820t_config *cfg) { … } EXPORT_SYMBOL_GPL(…); MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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