1 /** 2 * Driver for Sharp IX2505V (marked B0017) DVB-S silicon tuner 3 * 4 * Copyright (C) 2010 Malcolm Priestley 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License Version 2, as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 * 19 */ 20 21 #include <linux/module.h> 22 #include <linux/dvb/frontend.h> 23 #include <linux/slab.h> 24 #include <linux/types.h> 25 26 #include "ix2505v.h" 27 28 static int ix2505v_debug; 29 #define dprintk(level, args...) do { \ 30 if (ix2505v_debug & level) \ 31 printk(KERN_DEBUG "ix2505v: " args); \ 32 } while (0) 33 34 #define deb_info(args...) dprintk(0x01, args) 35 #define deb_i2c(args...) dprintk(0x02, args) 36 37 struct ix2505v_state { 38 struct i2c_adapter *i2c; 39 const struct ix2505v_config *config; 40 u32 frequency; 41 }; 42 43 /** 44 * Data read format of the Sharp IX2505V B0017 45 * 46 * byte1: 1 | 1 | 0 | 0 | 0 | MA1 | MA0 | 1 47 * byte2: POR | FL | RD2 | RD1 | RD0 | X | X | X 48 * 49 * byte1 = address 50 * byte2; 51 * POR = Power on Reset (VCC H=<2.2v L=>2.2v) 52 * FL = Phase Lock (H=lock L=unlock) 53 * RD0-2 = Reserved internal operations 54 * 55 * Only POR can be used to check the tuner is present 56 * 57 * Caution: after byte2 the I2C reverts to write mode continuing to read 58 * may corrupt tuning data. 59 * 60 */ 61 62 static int ix2505v_read_status_reg(struct ix2505v_state *state) 63 { 64 u8 addr = state->config->tuner_address; 65 u8 b2[] = {0}; 66 int ret; 67 68 struct i2c_msg msg[1] = { 69 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } 70 }; 71 72 ret = i2c_transfer(state->i2c, msg, 1); 73 deb_i2c("Read %s ", __func__); 74 75 return (ret == 1) ? (int) b2[0] : -1; 76 } 77 78 static int ix2505v_write(struct ix2505v_state *state, u8 buf[], u8 count) 79 { 80 struct i2c_msg msg[1] = { 81 { .addr = state->config->tuner_address, .flags = 0, 82 .buf = buf, .len = count }, 83 }; 84 85 int ret; 86 87 ret = i2c_transfer(state->i2c, msg, 1); 88 89 if (ret != 1) { 90 deb_i2c("%s: i2c error, ret=%d\n", __func__, ret); 91 return -EIO; 92 } 93 94 return 0; 95 } 96 97 static int ix2505v_release(struct dvb_frontend *fe) 98 { 99 struct ix2505v_state *state = fe->tuner_priv; 100 101 fe->tuner_priv = NULL; 102 kfree(state); 103 104 return 0; 105 } 106 107 /** 108 * Data write format of the Sharp IX2505V B0017 109 * 110 * byte1: 1 | 1 | 0 | 0 | 0 | 0(MA1)| 0(MA0)| 0 111 * byte2: 0 | BG1 | BG2 | N8 | N7 | N6 | N5 | N4 112 * byte3: N3 | N2 | N1 | A5 | A4 | A3 | A2 | A1 113 * byte4: 1 | 1(C1) | 1(C0) | PD5 | PD4 | TM | 0(RTS)| 1(REF) 114 * byte5: BA2 | BA1 | BA0 | PSC | PD3 |PD2/TS2|DIV/TS1|PD0/TS0 115 * 116 * byte1 = address 117 * 118 * Write order 119 * 1) byte1 -> byte2 -> byte3 -> byte4 -> byte5 120 * 2) byte1 -> byte4 -> byte5 -> byte2 -> byte3 121 * 3) byte1 -> byte2 -> byte3 -> byte4 122 * 4) byte1 -> byte4 -> byte5 -> byte2 123 * 5) byte1 -> byte2 -> byte3 124 * 6) byte1 -> byte4 -> byte5 125 * 7) byte1 -> byte2 126 * 8) byte1 -> byte4 127 * 128 * Recommended Setup 129 * 1 -> 8 -> 6 130 */ 131 132 static int ix2505v_set_params(struct dvb_frontend *fe) 133 { 134 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 135 struct ix2505v_state *state = fe->tuner_priv; 136 u32 frequency = c->frequency; 137 u32 b_w = (c->symbol_rate * 27) / 32000; 138 u32 div_factor, N , A, x; 139 int ret = 0, len; 140 u8 gain, cc, ref, psc, local_osc, lpf; 141 u8 data[4] = {0}; 142 143 if ((frequency < fe->ops.info.frequency_min) 144 || (frequency > fe->ops.info.frequency_max)) 145 return -EINVAL; 146 147 if (state->config->tuner_gain) 148 gain = (state->config->tuner_gain < 4) 149 ? state->config->tuner_gain : 0; 150 else 151 gain = 0x0; 152 153 if (state->config->tuner_chargepump) 154 cc = state->config->tuner_chargepump; 155 else 156 cc = 0x3; 157 158 ref = 8; /* REF =1 */ 159 psc = 32; /* PSC = 0 */ 160 161 div_factor = (frequency * ref) / 40; /* local osc = 4Mhz */ 162 x = div_factor / psc; 163 N = x/100; 164 A = ((x - (N * 100)) * psc) / 100; 165 166 data[0] = ((gain & 0x3) << 5) | (N >> 3); 167 data[1] = (N << 5) | (A & 0x1f); 168 data[2] = 0x81 | ((cc & 0x3) << 5) ; /*PD5,PD4 & TM = 0|C1,C0|REF=1*/ 169 170 deb_info("Frq=%d x=%d N=%d A=%d\n", frequency, x, N, A); 171 172 if (frequency <= 1065000) 173 local_osc = (6 << 5) | 2; 174 else if (frequency <= 1170000) 175 local_osc = (7 << 5) | 2; 176 else if (frequency <= 1300000) 177 local_osc = (1 << 5); 178 else if (frequency <= 1445000) 179 local_osc = (2 << 5); 180 else if (frequency <= 1607000) 181 local_osc = (3 << 5); 182 else if (frequency <= 1778000) 183 local_osc = (4 << 5); 184 else if (frequency <= 1942000) 185 local_osc = (5 << 5); 186 else /*frequency up to 2150000*/ 187 local_osc = (6 << 5); 188 189 data[3] = local_osc; /* all other bits set 0 */ 190 191 if (b_w <= 10000) 192 lpf = 0xc; 193 else if (b_w <= 12000) 194 lpf = 0x2; 195 else if (b_w <= 14000) 196 lpf = 0xa; 197 else if (b_w <= 16000) 198 lpf = 0x6; 199 else if (b_w <= 18000) 200 lpf = 0xe; 201 else if (b_w <= 20000) 202 lpf = 0x1; 203 else if (b_w <= 22000) 204 lpf = 0x9; 205 else if (b_w <= 24000) 206 lpf = 0x5; 207 else if (b_w <= 26000) 208 lpf = 0xd; 209 else if (b_w <= 28000) 210 lpf = 0x3; 211 else 212 lpf = 0xb; 213 214 deb_info("Osc=%x b_w=%x lpf=%x\n", local_osc, b_w, lpf); 215 deb_info("Data 0=[%4phN]\n", data); 216 217 if (fe->ops.i2c_gate_ctrl) 218 fe->ops.i2c_gate_ctrl(fe, 1); 219 220 len = sizeof(data); 221 ret |= ix2505v_write(state, data, len); 222 223 data[2] |= 0x4; /* set TM = 1 other bits same */ 224 225 if (fe->ops.i2c_gate_ctrl) 226 fe->ops.i2c_gate_ctrl(fe, 1); 227 228 len = 1; 229 ret |= ix2505v_write(state, &data[2], len); /* write byte 4 only */ 230 231 msleep(10); 232 233 data[2] |= ((lpf >> 2) & 0x3) << 3; /* lpf */ 234 data[3] |= (lpf & 0x3) << 2; 235 236 deb_info("Data 2=[%x%x]\n", data[2], data[3]); 237 238 if (fe->ops.i2c_gate_ctrl) 239 fe->ops.i2c_gate_ctrl(fe, 1); 240 241 len = 2; 242 ret |= ix2505v_write(state, &data[2], len); /* write byte 4 & 5 */ 243 244 if (state->config->min_delay_ms) 245 msleep(state->config->min_delay_ms); 246 247 state->frequency = frequency; 248 249 return ret; 250 } 251 252 static int ix2505v_get_frequency(struct dvb_frontend *fe, u32 *frequency) 253 { 254 struct ix2505v_state *state = fe->tuner_priv; 255 256 *frequency = state->frequency; 257 258 return 0; 259 } 260 261 static struct dvb_tuner_ops ix2505v_tuner_ops = { 262 .info = { 263 .name = "Sharp IX2505V (B0017)", 264 .frequency_min = 950000, 265 .frequency_max = 2175000 266 }, 267 .release = ix2505v_release, 268 .set_params = ix2505v_set_params, 269 .get_frequency = ix2505v_get_frequency, 270 }; 271 272 struct dvb_frontend *ix2505v_attach(struct dvb_frontend *fe, 273 const struct ix2505v_config *config, 274 struct i2c_adapter *i2c) 275 { 276 struct ix2505v_state *state = NULL; 277 int ret; 278 279 if (NULL == config) { 280 deb_i2c("%s: no config ", __func__); 281 goto error; 282 } 283 284 state = kzalloc(sizeof(struct ix2505v_state), GFP_KERNEL); 285 if (NULL == state) 286 return NULL; 287 288 state->config = config; 289 state->i2c = i2c; 290 291 if (state->config->tuner_write_only) { 292 if (fe->ops.i2c_gate_ctrl) 293 fe->ops.i2c_gate_ctrl(fe, 1); 294 295 ret = ix2505v_read_status_reg(state); 296 297 if (ret & 0x80) { 298 deb_i2c("%s: No IX2505V found\n", __func__); 299 goto error; 300 } 301 302 if (fe->ops.i2c_gate_ctrl) 303 fe->ops.i2c_gate_ctrl(fe, 0); 304 } 305 306 fe->tuner_priv = state; 307 308 memcpy(&fe->ops.tuner_ops, &ix2505v_tuner_ops, 309 sizeof(struct dvb_tuner_ops)); 310 deb_i2c("%s: initialization (%s addr=0x%02x) ok\n", 311 __func__, fe->ops.tuner_ops.info.name, config->tuner_address); 312 313 return fe; 314 315 error: 316 kfree(state); 317 return NULL; 318 } 319 EXPORT_SYMBOL(ix2505v_attach); 320 321 module_param_named(debug, ix2505v_debug, int, 0644); 322 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); 323 MODULE_DESCRIPTION("DVB IX2505V tuner driver"); 324 MODULE_AUTHOR("Malcolm Priestley"); 325 MODULE_LICENSE("GPL"); 326