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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | // SPDX-License-Identifier: GPL-2.0-or-later /* TDA8261 8PSK/QPSK tuner driver Copyright (C) Manu Abraham (abraham.manu@gmail.com) */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <media/dvb_frontend.h> #include "tda8261.h" struct tda8261_state { struct dvb_frontend *fe; struct i2c_adapter *i2c; const struct tda8261_config *config; /* state cache */ u32 frequency; u32 bandwidth; }; static int tda8261_read(struct tda8261_state *state, u8 *buf) { const struct tda8261_config *config = state->config; int err = 0; struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 1 }; if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) pr_err("%s: read error, err=%d\n", __func__, err); return err; } static int tda8261_write(struct tda8261_state *state, u8 *buf) { const struct tda8261_config *config = state->config; int err = 0; struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 }; if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) pr_err("%s: write error, err=%d\n", __func__, err); return err; } static int tda8261_get_status(struct dvb_frontend *fe, u32 *status) { struct tda8261_state *state = fe->tuner_priv; u8 result = 0; int err = 0; *status = 0; if ((err = tda8261_read(state, &result)) < 0) { pr_err("%s: I/O Error\n", __func__); return err; } if ((result >> 6) & 0x01) { pr_debug("%s: Tuner Phase Locked\n", __func__); *status = 1; } return err; } static const u32 div_tab[] = { 2000, 1000, 500, 250, 125 }; /* kHz */ static const u8 ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 }; static int tda8261_get_frequency(struct dvb_frontend *fe, u32 *frequency) { struct tda8261_state *state = fe->tuner_priv; *frequency = state->frequency; return 0; } static int tda8261_set_params(struct dvb_frontend *fe) { struct dtv_frontend_properties *c = &fe->dtv_property_cache; struct tda8261_state *state = fe->tuner_priv; const struct tda8261_config *config = state->config; u32 frequency, N, status = 0; u8 buf[4]; int err = 0; /* * N = Max VCO Frequency / Channel Spacing * Max VCO Frequency = VCO frequency + (channel spacing - 1) * (to account for half channel spacing on either side) */ frequency = c->frequency; if ((frequency < 950000) || (frequency > 2150000)) { pr_warn("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency); return -EINVAL; } N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size]; pr_debug("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n", __func__, config->step_size, div_tab[config->step_size], N, N); buf[0] = (N >> 8) & 0xff; buf[1] = N & 0xff; buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1); if (frequency < 1450000) buf[3] = 0x00; else if (frequency < 2000000) buf[3] = 0x40; else if (frequency < 2150000) buf[3] = 0x80; /* Set params */ err = tda8261_write(state, buf); if (err < 0) { pr_err("%s: I/O Error\n", __func__); return err; } /* sleep for some time */ pr_debug("%s: Waiting to Phase LOCK\n", __func__); msleep(20); /* check status */ if ((err = tda8261_get_status(fe, &status)) < 0) { pr_err("%s: I/O Error\n", __func__); return err; } if (status == 1) { pr_debug("%s: Tuner Phase locked: status=%d\n", __func__, status); state->frequency = frequency; /* cache successful state */ } else { pr_debug("%s: No Phase lock: status=%d\n", __func__, status); } return 0; } static void tda8261_release(struct dvb_frontend *fe) { struct tda8261_state *state = fe->tuner_priv; fe->tuner_priv = NULL; kfree(state); } static const struct dvb_tuner_ops tda8261_ops = { .info = { .name = "TDA8261", .frequency_min_hz = 950 * MHz, .frequency_max_hz = 2150 * MHz, }, .set_params = tda8261_set_params, .get_frequency = tda8261_get_frequency, .get_status = tda8261_get_status, .release = tda8261_release }; struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe, const struct tda8261_config *config, struct i2c_adapter *i2c) { struct tda8261_state *state = NULL; if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL) goto exit; state->config = config; state->i2c = i2c; state->fe = fe; fe->tuner_priv = state; fe->ops.tuner_ops = tda8261_ops; fe->ops.tuner_ops.info.frequency_step_hz = div_tab[config->step_size] * kHz; pr_info("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__); return fe; exit: kfree(state); return NULL; } EXPORT_SYMBOL_GPL(tda8261_attach); MODULE_AUTHOR("Manu Abraham"); MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner"); MODULE_LICENSE("GPL"); |