1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * NXP TDA18218HN silicon tuner driver |
4 | * |
5 | * Copyright (C) 2010 Antti Palosaari <crope@iki.fi> |
6 | */ |
7 | |
8 | #include "tda18218_priv.h" |
9 | |
10 | /* Max transfer size done by I2C transfer functions */ |
11 | #define MAX_XFER_SIZE 64 |
12 | |
13 | /* write multiple registers */ |
14 | static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) |
15 | { |
16 | int ret = 0, len2, remaining; |
17 | u8 buf[MAX_XFER_SIZE]; |
18 | struct i2c_msg msg[1] = { |
19 | { |
20 | .addr = priv->cfg->i2c_address, |
21 | .flags = 0, |
22 | .buf = buf, |
23 | } |
24 | }; |
25 | |
26 | if (1 + len > sizeof(buf)) { |
27 | dev_warn(&priv->i2c->dev, |
28 | "%s: i2c wr reg=%04x: len=%d is too big!\n" , |
29 | KBUILD_MODNAME, reg, len); |
30 | return -EINVAL; |
31 | } |
32 | |
33 | for (remaining = len; remaining > 0; |
34 | remaining -= (priv->cfg->i2c_wr_max - 1)) { |
35 | len2 = remaining; |
36 | if (len2 > (priv->cfg->i2c_wr_max - 1)) |
37 | len2 = (priv->cfg->i2c_wr_max - 1); |
38 | |
39 | msg[0].len = 1 + len2; |
40 | buf[0] = reg + len - remaining; |
41 | memcpy(&buf[1], &val[len - remaining], len2); |
42 | |
43 | ret = i2c_transfer(adap: priv->i2c, msgs: msg, num: 1); |
44 | if (ret != 1) |
45 | break; |
46 | } |
47 | |
48 | if (ret == 1) { |
49 | ret = 0; |
50 | } else { |
51 | dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \ |
52 | "len=%d\n" , KBUILD_MODNAME, ret, reg, len); |
53 | ret = -EREMOTEIO; |
54 | } |
55 | |
56 | return ret; |
57 | } |
58 | |
59 | /* read multiple registers */ |
60 | static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) |
61 | { |
62 | int ret; |
63 | u8 buf[MAX_XFER_SIZE]; /* we must start read always from reg 0x00 */ |
64 | struct i2c_msg msg[2] = { |
65 | { |
66 | .addr = priv->cfg->i2c_address, |
67 | .flags = 0, |
68 | .len = 1, |
69 | .buf = "\x00" , |
70 | }, { |
71 | .addr = priv->cfg->i2c_address, |
72 | .flags = I2C_M_RD, |
73 | .len = reg + len, |
74 | .buf = buf, |
75 | } |
76 | }; |
77 | |
78 | if (reg + len > sizeof(buf)) { |
79 | dev_warn(&priv->i2c->dev, |
80 | "%s: i2c wr reg=%04x: len=%d is too big!\n" , |
81 | KBUILD_MODNAME, reg, len); |
82 | return -EINVAL; |
83 | } |
84 | |
85 | ret = i2c_transfer(adap: priv->i2c, msgs: msg, num: 2); |
86 | if (ret == 2) { |
87 | memcpy(val, &buf[reg], len); |
88 | ret = 0; |
89 | } else { |
90 | dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \ |
91 | "len=%d\n" , KBUILD_MODNAME, ret, reg, len); |
92 | ret = -EREMOTEIO; |
93 | } |
94 | |
95 | return ret; |
96 | } |
97 | |
98 | /* write single register */ |
99 | static int tda18218_wr_reg(struct tda18218_priv *priv, u8 reg, u8 val) |
100 | { |
101 | return tda18218_wr_regs(priv, reg, val: &val, len: 1); |
102 | } |
103 | |
104 | /* read single register */ |
105 | |
106 | static int tda18218_rd_reg(struct tda18218_priv *priv, u8 reg, u8 *val) |
107 | { |
108 | return tda18218_rd_regs(priv, reg, val, len: 1); |
109 | } |
110 | |
111 | static int tda18218_set_params(struct dvb_frontend *fe) |
112 | { |
113 | struct tda18218_priv *priv = fe->tuner_priv; |
114 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
115 | u32 bw = c->bandwidth_hz; |
116 | int ret; |
117 | u8 buf[3], i, BP_Filter, LP_Fc; |
118 | u32 LO_Frac; |
119 | /* TODO: find out correct AGC algorithm */ |
120 | u8 agc[][2] = { |
121 | { R20_AGC11, 0x60 }, |
122 | { R23_AGC21, 0x02 }, |
123 | { R20_AGC11, 0xa0 }, |
124 | { R23_AGC21, 0x09 }, |
125 | { R20_AGC11, 0xe0 }, |
126 | { R23_AGC21, 0x0c }, |
127 | { R20_AGC11, 0x40 }, |
128 | { R23_AGC21, 0x01 }, |
129 | { R20_AGC11, 0x80 }, |
130 | { R23_AGC21, 0x08 }, |
131 | { R20_AGC11, 0xc0 }, |
132 | { R23_AGC21, 0x0b }, |
133 | { R24_AGC22, 0x1c }, |
134 | { R24_AGC22, 0x0c }, |
135 | }; |
136 | |
137 | if (fe->ops.i2c_gate_ctrl) |
138 | fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
139 | |
140 | /* low-pass filter cut-off frequency */ |
141 | if (bw <= 6000000) { |
142 | LP_Fc = 0; |
143 | priv->if_frequency = 3000000; |
144 | } else if (bw <= 7000000) { |
145 | LP_Fc = 1; |
146 | priv->if_frequency = 3500000; |
147 | } else { |
148 | LP_Fc = 2; |
149 | priv->if_frequency = 4000000; |
150 | } |
151 | |
152 | LO_Frac = c->frequency + priv->if_frequency; |
153 | |
154 | /* band-pass filter */ |
155 | if (LO_Frac < 188000000) |
156 | BP_Filter = 3; |
157 | else if (LO_Frac < 253000000) |
158 | BP_Filter = 4; |
159 | else if (LO_Frac < 343000000) |
160 | BP_Filter = 5; |
161 | else |
162 | BP_Filter = 6; |
163 | |
164 | buf[0] = (priv->regs[R1A_IF1] & ~7) | BP_Filter; /* BP_Filter */ |
165 | buf[1] = (priv->regs[R1B_IF2] & ~3) | LP_Fc; /* LP_Fc */ |
166 | buf[2] = priv->regs[R1C_AGC2B]; |
167 | ret = tda18218_wr_regs(priv, R1A_IF1, val: buf, len: 3); |
168 | if (ret) |
169 | goto error; |
170 | |
171 | buf[0] = (LO_Frac / 1000) >> 12; /* LO_Frac_0 */ |
172 | buf[1] = (LO_Frac / 1000) >> 4; /* LO_Frac_1 */ |
173 | buf[2] = (LO_Frac / 1000) << 4 | |
174 | (priv->regs[R0C_MD5] & 0x0f); /* LO_Frac_2 */ |
175 | ret = tda18218_wr_regs(priv, R0A_MD3, val: buf, len: 3); |
176 | if (ret) |
177 | goto error; |
178 | |
179 | buf[0] = priv->regs[R0F_MD8] | (1 << 6); /* Freq_prog_Start */ |
180 | ret = tda18218_wr_regs(priv, R0F_MD8, val: buf, len: 1); |
181 | if (ret) |
182 | goto error; |
183 | |
184 | buf[0] = priv->regs[R0F_MD8] & ~(1 << 6); /* Freq_prog_Start */ |
185 | ret = tda18218_wr_regs(priv, R0F_MD8, val: buf, len: 1); |
186 | if (ret) |
187 | goto error; |
188 | |
189 | /* trigger AGC */ |
190 | for (i = 0; i < ARRAY_SIZE(agc); i++) { |
191 | ret = tda18218_wr_reg(priv, reg: agc[i][0], val: agc[i][1]); |
192 | if (ret) |
193 | goto error; |
194 | } |
195 | |
196 | error: |
197 | if (fe->ops.i2c_gate_ctrl) |
198 | fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
199 | |
200 | if (ret) |
201 | dev_dbg(&priv->i2c->dev, "%s: failed=%d\n" , __func__, ret); |
202 | |
203 | return ret; |
204 | } |
205 | |
206 | static int tda18218_get_if_frequency(struct dvb_frontend *fe, u32 *frequency) |
207 | { |
208 | struct tda18218_priv *priv = fe->tuner_priv; |
209 | *frequency = priv->if_frequency; |
210 | dev_dbg(&priv->i2c->dev, "%s: if_frequency=%d\n" , __func__, *frequency); |
211 | return 0; |
212 | } |
213 | |
214 | static int tda18218_sleep(struct dvb_frontend *fe) |
215 | { |
216 | struct tda18218_priv *priv = fe->tuner_priv; |
217 | int ret; |
218 | |
219 | if (fe->ops.i2c_gate_ctrl) |
220 | fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
221 | |
222 | /* standby */ |
223 | ret = tda18218_wr_reg(priv, R17_PD1, val: priv->regs[R17_PD1] | (1 << 0)); |
224 | |
225 | if (fe->ops.i2c_gate_ctrl) |
226 | fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
227 | |
228 | if (ret) |
229 | dev_dbg(&priv->i2c->dev, "%s: failed=%d\n" , __func__, ret); |
230 | |
231 | return ret; |
232 | } |
233 | |
234 | static int tda18218_init(struct dvb_frontend *fe) |
235 | { |
236 | struct tda18218_priv *priv = fe->tuner_priv; |
237 | int ret; |
238 | |
239 | /* TODO: calibrations */ |
240 | |
241 | if (fe->ops.i2c_gate_ctrl) |
242 | fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
243 | |
244 | ret = tda18218_wr_regs(priv, R00_ID, val: priv->regs, TDA18218_NUM_REGS); |
245 | |
246 | if (fe->ops.i2c_gate_ctrl) |
247 | fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
248 | |
249 | if (ret) |
250 | dev_dbg(&priv->i2c->dev, "%s: failed=%d\n" , __func__, ret); |
251 | |
252 | return ret; |
253 | } |
254 | |
255 | static void tda18218_release(struct dvb_frontend *fe) |
256 | { |
257 | kfree(objp: fe->tuner_priv); |
258 | fe->tuner_priv = NULL; |
259 | } |
260 | |
261 | static const struct dvb_tuner_ops tda18218_tuner_ops = { |
262 | .info = { |
263 | .name = "NXP TDA18218" , |
264 | |
265 | .frequency_min_hz = 174 * MHz, |
266 | .frequency_max_hz = 864 * MHz, |
267 | .frequency_step_hz = 1 * kHz, |
268 | }, |
269 | |
270 | .release = tda18218_release, |
271 | .init = tda18218_init, |
272 | .sleep = tda18218_sleep, |
273 | |
274 | .set_params = tda18218_set_params, |
275 | |
276 | .get_if_frequency = tda18218_get_if_frequency, |
277 | }; |
278 | |
279 | struct dvb_frontend *tda18218_attach(struct dvb_frontend *fe, |
280 | struct i2c_adapter *i2c, struct tda18218_config *cfg) |
281 | { |
282 | struct tda18218_priv *priv = NULL; |
283 | u8 val; |
284 | int ret; |
285 | /* chip default registers values */ |
286 | static u8 def_regs[] = { |
287 | 0xc0, 0x88, 0x00, 0x8e, 0x03, 0x00, 0x00, 0xd0, 0x00, 0x40, |
288 | 0x00, 0x00, 0x07, 0xff, 0x84, 0x09, 0x00, 0x13, 0x00, 0x00, |
289 | 0x01, 0x84, 0x09, 0xf0, 0x19, 0x0a, 0x8e, 0x69, 0x98, 0x01, |
290 | 0x00, 0x58, 0x10, 0x40, 0x8c, 0x00, 0x0c, 0x48, 0x85, 0xc9, |
291 | 0xa7, 0x00, 0x00, 0x00, 0x30, 0x81, 0x80, 0x00, 0x39, 0x00, |
292 | 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf6, 0xf6 |
293 | }; |
294 | |
295 | priv = kzalloc(size: sizeof(struct tda18218_priv), GFP_KERNEL); |
296 | if (priv == NULL) |
297 | return NULL; |
298 | |
299 | priv->cfg = cfg; |
300 | priv->i2c = i2c; |
301 | fe->tuner_priv = priv; |
302 | |
303 | if (fe->ops.i2c_gate_ctrl) |
304 | fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
305 | |
306 | /* check if the tuner is there */ |
307 | ret = tda18218_rd_reg(priv, R00_ID, val: &val); |
308 | if (!ret) |
309 | dev_dbg(&priv->i2c->dev, "%s: chip id=%02x\n" , __func__, val); |
310 | if (ret || val != def_regs[R00_ID]) { |
311 | kfree(objp: priv); |
312 | return NULL; |
313 | } |
314 | |
315 | dev_info(&priv->i2c->dev, |
316 | "%s: NXP TDA18218HN successfully identified\n" , |
317 | KBUILD_MODNAME); |
318 | |
319 | memcpy(&fe->ops.tuner_ops, &tda18218_tuner_ops, |
320 | sizeof(struct dvb_tuner_ops)); |
321 | memcpy(priv->regs, def_regs, sizeof(def_regs)); |
322 | |
323 | /* loop-through enabled chip default register values */ |
324 | if (priv->cfg->loop_through) { |
325 | priv->regs[R17_PD1] = 0xb0; |
326 | priv->regs[R18_PD2] = 0x59; |
327 | } |
328 | |
329 | /* standby */ |
330 | ret = tda18218_wr_reg(priv, R17_PD1, val: priv->regs[R17_PD1] | (1 << 0)); |
331 | if (ret) |
332 | dev_dbg(&priv->i2c->dev, "%s: failed=%d\n" , __func__, ret); |
333 | |
334 | if (fe->ops.i2c_gate_ctrl) |
335 | fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
336 | |
337 | return fe; |
338 | } |
339 | EXPORT_SYMBOL_GPL(tda18218_attach); |
340 | |
341 | MODULE_DESCRIPTION("NXP TDA18218HN silicon tuner driver" ); |
342 | MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>" ); |
343 | MODULE_LICENSE("GPL" ); |
344 | |