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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
3e978a82 MA |
2 | /* |
3 | TDA665x tuner driver | |
4 | Copyright (C) Manu Abraham (abraham.manu@gmail.com) | |
5 | ||
3e978a82 MA |
6 | */ |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
3e978a82 | 12 | |
fada1935 | 13 | #include <media/dvb_frontend.h> |
3e978a82 MA |
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(state->i2c, &msg, 1); | |
32 | if (err != 1) | |
33 | goto exit; | |
34 | ||
35 | return err; | |
36 | exit: | |
f5ae4f6f | 37 | printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err); |
3e978a82 MA |
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(state->i2c, &msg, 1); | |
48 | if (err != 1) | |
49 | goto exit; | |
50 | ||
51 | return err; | |
52 | exit: | |
f5ae4f6f | 53 | printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err); |
3e978a82 MA |
54 | return err; |
55 | } | |
56 | ||
8fdc25bf MCC |
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 | ||
3e978a82 MA |
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, &result); | |
75 | if (err < 0) | |
76 | goto exit; | |
77 | ||
78 | if ((result >> 6) & 0x01) { | |
f5ae4f6f | 79 | printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__); |
3e978a82 MA |
80 | *status = 1; |
81 | } | |
82 | ||
83 | return err; | |
84 | exit: | |
f5ae4f6f | 85 | printk(KERN_ERR "%s: I/O Error\n", __func__); |
3e978a82 MA |
86 | return err; |
87 | } | |
88 | ||
8e6c4be3 MCC |
89 | static int tda665x_set_frequency(struct dvb_frontend *fe, |
90 | u32 new_frequency) | |
3e978a82 MA |
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 | ||
8e6c4be3 MCC |
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); | |
3e978a82 MA |
102 | return -EINVAL; |
103 | } | |
104 | ||
8e6c4be3 MCC |
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, 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(20); | |
159 | /* check status */ | |
160 | err = tda665x_get_status(fe, &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 | ||
3e978a82 MA |
173 | return 0; |
174 | exit: | |
f5ae4f6f | 175 | printk(KERN_ERR "%s: I/O Error\n", __func__); |
3e978a82 MA |
176 | return err; |
177 | } | |
178 | ||
8fdc25bf MCC |
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, c->frequency); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
f2709c20 MCC |
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(state); | |
194 | } | |
195 | ||
14c4bf3c | 196 | static const struct dvb_tuner_ops tda665x_ops = { |
3e978a82 | 197 | .get_status = tda665x_get_status, |
8fdc25bf MCC |
198 | .set_params = tda665x_set_params, |
199 | .get_frequency = tda665x_get_frequency, | |
f2709c20 | 200 | .release = tda665x_release |
3e978a82 MA |
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 | ||
f5ae4f6f | 210 | state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL); |
0df10427 PST |
211 | if (!state) |
212 | return NULL; | |
3e978a82 MA |
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 | ||
f5ae4f6f | 221 | memcpy(info->name, config->name, sizeof(config->name)); |
a3f90c75 MCC |
222 | info->frequency_min_hz = config->frequency_min; |
223 | info->frequency_max_hz = config->frequency_max; | |
224 | info->frequency_step_hz = config->frequency_offst; | |
3e978a82 | 225 | |
f5ae4f6f | 226 | printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name); |
3e978a82 MA |
227 | |
228 | return fe; | |
3e978a82 MA |
229 | } |
230 | EXPORT_SYMBOL(tda665x_attach); | |
231 | ||
232 | MODULE_DESCRIPTION("TDA665x driver"); | |
233 | MODULE_AUTHOR("Manu Abraham"); | |
234 | MODULE_LICENSE("GPL"); |