1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | TDA665x tuner driver |
4 | Copyright (C) Manu Abraham (abraham.manu@gmail.com) |
5 | |
6 | */ |
7 | |
8 | #include <linux/init.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/module.h> |
11 | #include <linux/slab.h> |
12 | |
13 | #include <media/dvb_frontend.h> |
14 | #include "tda665x.h" |
15 | |
16 | struct tda665x_state { |
17 | struct dvb_frontend *fe; |
18 | struct i2c_adapter *i2c; |
19 | const struct tda665x_config *config; |
20 | |
21 | u32 frequency; |
22 | u32 bandwidth; |
23 | }; |
24 | |
25 | static int tda665x_read(struct tda665x_state *state, u8 *buf) |
26 | { |
27 | const struct tda665x_config *config = state->config; |
28 | int err = 0; |
29 | struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 }; |
30 | |
31 | err = i2c_transfer(adap: state->i2c, msgs: &msg, num: 1); |
32 | if (err != 1) |
33 | goto exit; |
34 | |
35 | return err; |
36 | exit: |
37 | printk(KERN_ERR "%s: I/O Error err=<%d>\n" , __func__, err); |
38 | return err; |
39 | } |
40 | |
41 | static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length) |
42 | { |
43 | const struct tda665x_config *config = state->config; |
44 | int err = 0; |
45 | struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length }; |
46 | |
47 | err = i2c_transfer(adap: state->i2c, msgs: &msg, num: 1); |
48 | if (err != 1) |
49 | goto exit; |
50 | |
51 | return err; |
52 | exit: |
53 | printk(KERN_ERR "%s: I/O Error err=<%d>\n" , __func__, err); |
54 | return err; |
55 | } |
56 | |
57 | static int tda665x_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
58 | { |
59 | struct tda665x_state *state = fe->tuner_priv; |
60 | |
61 | *frequency = state->frequency; |
62 | |
63 | return 0; |
64 | } |
65 | |
66 | static int tda665x_get_status(struct dvb_frontend *fe, u32 *status) |
67 | { |
68 | struct tda665x_state *state = fe->tuner_priv; |
69 | u8 result = 0; |
70 | int err = 0; |
71 | |
72 | *status = 0; |
73 | |
74 | err = tda665x_read(state, buf: &result); |
75 | if (err < 0) |
76 | goto exit; |
77 | |
78 | if ((result >> 6) & 0x01) { |
79 | printk(KERN_DEBUG "%s: Tuner Phase Locked\n" , __func__); |
80 | *status = 1; |
81 | } |
82 | |
83 | return err; |
84 | exit: |
85 | printk(KERN_ERR "%s: I/O Error\n" , __func__); |
86 | return err; |
87 | } |
88 | |
89 | static int tda665x_set_frequency(struct dvb_frontend *fe, |
90 | u32 new_frequency) |
91 | { |
92 | struct tda665x_state *state = fe->tuner_priv; |
93 | const struct tda665x_config *config = state->config; |
94 | u32 frequency, status = 0; |
95 | u8 buf[4]; |
96 | int err = 0; |
97 | |
98 | if ((new_frequency < config->frequency_max) |
99 | || (new_frequency > config->frequency_min)) { |
100 | printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n" , |
101 | __func__, new_frequency); |
102 | return -EINVAL; |
103 | } |
104 | |
105 | frequency = new_frequency; |
106 | |
107 | frequency += config->frequency_offst; |
108 | frequency *= config->ref_multiplier; |
109 | frequency += config->ref_divider >> 1; |
110 | frequency /= config->ref_divider; |
111 | |
112 | buf[0] = (u8) ((frequency & 0x7f00) >> 8); |
113 | buf[1] = (u8) (frequency & 0x00ff) >> 0; |
114 | buf[2] = 0x80 | 0x40 | 0x02; |
115 | buf[3] = 0x00; |
116 | |
117 | /* restore frequency */ |
118 | frequency = new_frequency; |
119 | |
120 | if (frequency < 153000000) { |
121 | /* VHF-L */ |
122 | buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */ |
123 | if (frequency < 68000000) |
124 | buf[3] |= 0x40; /* 83uA */ |
125 | if (frequency < 1040000000) |
126 | buf[3] |= 0x60; /* 122uA */ |
127 | if (frequency < 1250000000) |
128 | buf[3] |= 0x80; /* 163uA */ |
129 | else |
130 | buf[3] |= 0xa0; /* 254uA */ |
131 | } else if (frequency < 438000000) { |
132 | /* VHF-H */ |
133 | buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */ |
134 | if (frequency < 230000000) |
135 | buf[3] |= 0x40; |
136 | if (frequency < 300000000) |
137 | buf[3] |= 0x60; |
138 | else |
139 | buf[3] |= 0x80; |
140 | } else { |
141 | /* UHF */ |
142 | buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */ |
143 | if (frequency < 470000000) |
144 | buf[3] |= 0x60; |
145 | if (frequency < 526000000) |
146 | buf[3] |= 0x80; |
147 | else |
148 | buf[3] |= 0xa0; |
149 | } |
150 | |
151 | /* Set params */ |
152 | err = tda665x_write(state, buf, length: 5); |
153 | if (err < 0) |
154 | goto exit; |
155 | |
156 | /* sleep for some time */ |
157 | printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n" , __func__); |
158 | msleep(msecs: 20); |
159 | /* check status */ |
160 | err = tda665x_get_status(fe, status: &status); |
161 | if (err < 0) |
162 | goto exit; |
163 | |
164 | if (status == 1) { |
165 | printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n" , |
166 | __func__, status); |
167 | state->frequency = frequency; /* cache successful state */ |
168 | } else { |
169 | printk(KERN_ERR "%s: No Phase lock: status=%d\n" , |
170 | __func__, status); |
171 | } |
172 | |
173 | return 0; |
174 | exit: |
175 | printk(KERN_ERR "%s: I/O Error\n" , __func__); |
176 | return err; |
177 | } |
178 | |
179 | static int tda665x_set_params(struct dvb_frontend *fe) |
180 | { |
181 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
182 | |
183 | tda665x_set_frequency(fe, new_frequency: c->frequency); |
184 | |
185 | return 0; |
186 | } |
187 | |
188 | static void tda665x_release(struct dvb_frontend *fe) |
189 | { |
190 | struct tda665x_state *state = fe->tuner_priv; |
191 | |
192 | fe->tuner_priv = NULL; |
193 | kfree(objp: state); |
194 | } |
195 | |
196 | static const struct dvb_tuner_ops tda665x_ops = { |
197 | .get_status = tda665x_get_status, |
198 | .set_params = tda665x_set_params, |
199 | .get_frequency = tda665x_get_frequency, |
200 | .release = tda665x_release |
201 | }; |
202 | |
203 | struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe, |
204 | const struct tda665x_config *config, |
205 | struct i2c_adapter *i2c) |
206 | { |
207 | struct tda665x_state *state = NULL; |
208 | struct dvb_tuner_info *info; |
209 | |
210 | state = kzalloc(size: sizeof(struct tda665x_state), GFP_KERNEL); |
211 | if (!state) |
212 | return NULL; |
213 | |
214 | state->config = config; |
215 | state->i2c = i2c; |
216 | state->fe = fe; |
217 | fe->tuner_priv = state; |
218 | fe->ops.tuner_ops = tda665x_ops; |
219 | info = &fe->ops.tuner_ops.info; |
220 | |
221 | memcpy(info->name, config->name, sizeof(config->name)); |
222 | info->frequency_min_hz = config->frequency_min; |
223 | info->frequency_max_hz = config->frequency_max; |
224 | info->frequency_step_hz = config->frequency_offst; |
225 | |
226 | printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n" , __func__, info->name); |
227 | |
228 | return fe; |
229 | } |
230 | EXPORT_SYMBOL_GPL(tda665x_attach); |
231 | |
232 | MODULE_DESCRIPTION("TDA665x driver" ); |
233 | MODULE_AUTHOR("Manu Abraham" ); |
234 | MODULE_LICENSE("GPL" ); |
235 | |