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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Driver for Sharp IX2505V (marked B0017) DVB-S silicon tuner4 *5 * Copyright (C) 2010 Malcolm Priestley6 */7 8#include <linux/module.h>9#include <linux/dvb/frontend.h>10#include <linux/slab.h>11#include <linux/types.h>12 13#include "ix2505v.h"14 15static int ix2505v_debug;16#define dprintk(level, args...) do { \17 if (ix2505v_debug & level) \18 printk(KERN_DEBUG "ix2505v: " args); \19} while (0)20 21#define deb_info(args...) dprintk(0x01, args)22#define deb_i2c(args...) dprintk(0x02, args)23 24struct ix2505v_state {25 struct i2c_adapter *i2c;26 const struct ix2505v_config *config;27 u32 frequency;28};29 30/*31 * Data read format of the Sharp IX2505V B001732 *33 * byte1: 1 | 1 | 0 | 0 | 0 | MA1 | MA0 | 134 * byte2: POR | FL | RD2 | RD1 | RD0 | X | X | X35 *36 * byte1 = address37 * byte2;38 * POR = Power on Reset (VCC H=<2.2v L=>2.2v)39 * FL = Phase Lock (H=lock L=unlock)40 * RD0-2 = Reserved internal operations41 *42 * Only POR can be used to check the tuner is present43 *44 * Caution: after byte2 the I2C reverts to write mode continuing to read45 * may corrupt tuning data.46 *47 */48 49static int ix2505v_read_status_reg(struct ix2505v_state *state)50{51 u8 addr = state->config->tuner_address;52 u8 b2[] = {0};53 int ret;54 55 struct i2c_msg msg[1] = {56 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 }57 };58 59 ret = i2c_transfer(state->i2c, msg, 1);60 deb_i2c("Read %s ", __func__);61 62 return (ret == 1) ? (int) b2[0] : -1;63}64 65static int ix2505v_write(struct ix2505v_state *state, u8 buf[], u8 count)66{67 struct i2c_msg msg[1] = {68 { .addr = state->config->tuner_address, .flags = 0,69 .buf = buf, .len = count },70 };71 72 int ret;73 74 ret = i2c_transfer(state->i2c, msg, 1);75 76 if (ret != 1) {77 deb_i2c("%s: i2c error, ret=%d\n", __func__, ret);78 return -EIO;79 }80 81 return 0;82}83 84static void ix2505v_release(struct dvb_frontend *fe)85{86 struct ix2505v_state *state = fe->tuner_priv;87 88 fe->tuner_priv = NULL;89 kfree(state);90 91}92 93/*94 * Data write format of the Sharp IX2505V B001795 *96 * byte1: 1 | 1 | 0 | 0 | 0 | 0(MA1)| 0(MA0)| 097 * byte2: 0 | BG1 | BG2 | N8 | N7 | N6 | N5 | N498 * byte3: N3 | N2 | N1 | A5 | A4 | A3 | A2 | A199 * byte4: 1 | 1(C1) | 1(C0) | PD5 | PD4 | TM | 0(RTS)| 1(REF)100 * byte5: BA2 | BA1 | BA0 | PSC | PD3 |PD2/TS2|DIV/TS1|PD0/TS0101 *102 * byte1 = address103 *104 * Write order105 * 1) byte1 -> byte2 -> byte3 -> byte4 -> byte5106 * 2) byte1 -> byte4 -> byte5 -> byte2 -> byte3107 * 3) byte1 -> byte2 -> byte3 -> byte4108 * 4) byte1 -> byte4 -> byte5 -> byte2109 * 5) byte1 -> byte2 -> byte3110 * 6) byte1 -> byte4 -> byte5111 * 7) byte1 -> byte2112 * 8) byte1 -> byte4113 *114 * Recommended Setup115 * 1 -> 8 -> 6116 */117 118static int ix2505v_set_params(struct dvb_frontend *fe)119{120 struct dtv_frontend_properties *c = &fe->dtv_property_cache;121 struct ix2505v_state *state = fe->tuner_priv;122 u32 frequency = c->frequency;123 u32 b_w = (c->symbol_rate * 27) / 32000;124 u32 div_factor, N , A, x;125 int ret = 0, len;126 u8 gain, cc, ref, psc, local_osc, lpf;127 u8 data[4] = {0};128 129 if ((frequency < fe->ops.info.frequency_min_hz / kHz)130 || (frequency > fe->ops.info.frequency_max_hz / kHz))131 return -EINVAL;132 133 if (state->config->tuner_gain)134 gain = (state->config->tuner_gain < 4)135 ? state->config->tuner_gain : 0;136 else137 gain = 0x0;138 139 if (state->config->tuner_chargepump)140 cc = state->config->tuner_chargepump;141 else142 cc = 0x3;143 144 ref = 8; /* REF =1 */145 psc = 32; /* PSC = 0 */146 147 div_factor = (frequency * ref) / 40; /* local osc = 4Mhz */148 x = div_factor / psc;149 N = x/100;150 A = ((x - (N * 100)) * psc) / 100;151 152 data[0] = ((gain & 0x3) << 5) | (N >> 3);153 data[1] = (N << 5) | (A & 0x1f);154 data[2] = 0x81 | ((cc & 0x3) << 5) ; /*PD5,PD4 & TM = 0|C1,C0|REF=1*/155 156 deb_info("Frq=%d x=%d N=%d A=%d\n", frequency, x, N, A);157 158 if (frequency <= 1065000)159 local_osc = (6 << 5) | 2;160 else if (frequency <= 1170000)161 local_osc = (7 << 5) | 2;162 else if (frequency <= 1300000)163 local_osc = (1 << 5);164 else if (frequency <= 1445000)165 local_osc = (2 << 5);166 else if (frequency <= 1607000)167 local_osc = (3 << 5);168 else if (frequency <= 1778000)169 local_osc = (4 << 5);170 else if (frequency <= 1942000)171 local_osc = (5 << 5);172 else /*frequency up to 2150000*/173 local_osc = (6 << 5);174 175 data[3] = local_osc; /* all other bits set 0 */176 177 if (b_w <= 10000)178 lpf = 0xc;179 else if (b_w <= 12000)180 lpf = 0x2;181 else if (b_w <= 14000)182 lpf = 0xa;183 else if (b_w <= 16000)184 lpf = 0x6;185 else if (b_w <= 18000)186 lpf = 0xe;187 else if (b_w <= 20000)188 lpf = 0x1;189 else if (b_w <= 22000)190 lpf = 0x9;191 else if (b_w <= 24000)192 lpf = 0x5;193 else if (b_w <= 26000)194 lpf = 0xd;195 else if (b_w <= 28000)196 lpf = 0x3;197 else198 lpf = 0xb;199 200 deb_info("Osc=%x b_w=%x lpf=%x\n", local_osc, b_w, lpf);201 deb_info("Data 0=[%4phN]\n", data);202 203 if (fe->ops.i2c_gate_ctrl)204 fe->ops.i2c_gate_ctrl(fe, 1);205 206 len = sizeof(data);207 ret |= ix2505v_write(state, data, len);208 209 data[2] |= 0x4; /* set TM = 1 other bits same */210 211 if (fe->ops.i2c_gate_ctrl)212 fe->ops.i2c_gate_ctrl(fe, 1);213 214 len = 1;215 ret |= ix2505v_write(state, &data[2], len); /* write byte 4 only */216 217 msleep(10);218 219 data[2] |= ((lpf >> 2) & 0x3) << 3; /* lpf */220 data[3] |= (lpf & 0x3) << 2;221 222 deb_info("Data 2=[%x%x]\n", data[2], data[3]);223 224 if (fe->ops.i2c_gate_ctrl)225 fe->ops.i2c_gate_ctrl(fe, 1);226 227 len = 2;228 ret |= ix2505v_write(state, &data[2], len); /* write byte 4 & 5 */229 230 if (state->config->min_delay_ms)231 msleep(state->config->min_delay_ms);232 233 state->frequency = frequency;234 235 return ret;236}237 238static int ix2505v_get_frequency(struct dvb_frontend *fe, u32 *frequency)239{240 struct ix2505v_state *state = fe->tuner_priv;241 242 *frequency = state->frequency;243 244 return 0;245}246 247static const struct dvb_tuner_ops ix2505v_tuner_ops = {248 .info = {249 .name = "Sharp IX2505V (B0017)",250 .frequency_min_hz = 950 * MHz,251 .frequency_max_hz = 2175 * MHz252 },253 .release = ix2505v_release,254 .set_params = ix2505v_set_params,255 .get_frequency = ix2505v_get_frequency,256};257 258struct dvb_frontend *ix2505v_attach(struct dvb_frontend *fe,259 const struct ix2505v_config *config,260 struct i2c_adapter *i2c)261{262 struct ix2505v_state *state = NULL;263 int ret;264 265 if (NULL == config) {266 deb_i2c("%s: no config ", __func__);267 goto error;268 }269 270 state = kzalloc(sizeof(struct ix2505v_state), GFP_KERNEL);271 if (NULL == state)272 return NULL;273 274 state->config = config;275 state->i2c = i2c;276 277 if (state->config->tuner_write_only) {278 if (fe->ops.i2c_gate_ctrl)279 fe->ops.i2c_gate_ctrl(fe, 1);280 281 ret = ix2505v_read_status_reg(state);282 283 if (ret & 0x80) {284 deb_i2c("%s: No IX2505V found\n", __func__);285 goto error;286 }287 288 if (fe->ops.i2c_gate_ctrl)289 fe->ops.i2c_gate_ctrl(fe, 0);290 }291 292 fe->tuner_priv = state;293 294 memcpy(&fe->ops.tuner_ops, &ix2505v_tuner_ops,295 sizeof(struct dvb_tuner_ops));296 deb_i2c("%s: initialization (%s addr=0x%02x) ok\n",297 __func__, fe->ops.tuner_ops.info.name, config->tuner_address);298 299 return fe;300 301error:302 kfree(state);303 return NULL;304}305EXPORT_SYMBOL_GPL(ix2505v_attach);306 307module_param_named(debug, ix2505v_debug, int, 0644);308MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");309MODULE_DESCRIPTION("DVB IX2505V tuner driver");310MODULE_AUTHOR("Malcolm Priestley");311MODULE_LICENSE("GPL");312