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00360205 MA |
1 | /* |
2 | TDA8261 8PSK/QPSK tuner driver | |
3 | Copyright (C) Manu Abraham (abraham.manu@gmail.com) | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
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/init.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
00360205 MA |
25 | |
26 | #include "dvb_frontend.h" | |
27 | #include "tda8261.h" | |
28 | ||
29 | struct tda8261_state { | |
41e1151b MA |
30 | struct dvb_frontend *fe; |
31 | struct i2c_adapter *i2c; | |
32 | const struct tda8261_config *config; | |
00360205 MA |
33 | |
34 | /* state cache */ | |
35 | u32 frequency; | |
36 | u32 bandwidth; | |
37 | }; | |
38 | ||
39 | static int tda8261_read(struct tda8261_state *state, u8 *buf) | |
40 | { | |
41e1151b | 41 | const struct tda8261_config *config = state->config; |
00360205 | 42 | int err = 0; |
225ee0ca | 43 | struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 1 }; |
00360205 | 44 | |
c7d85a2d | 45 | if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) |
eb2e2652 | 46 | pr_err("%s: read error, err=%d\n", __func__, err); |
00360205 MA |
47 | |
48 | return err; | |
49 | } | |
50 | ||
51 | static int tda8261_write(struct tda8261_state *state, u8 *buf) | |
52 | { | |
41e1151b | 53 | const struct tda8261_config *config = state->config; |
00360205 MA |
54 | int err = 0; |
55 | struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 }; | |
56 | ||
57 | if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) | |
eb2e2652 | 58 | pr_err("%s: write error, err=%d\n", __func__, err); |
00360205 MA |
59 | |
60 | return err; | |
61 | } | |
62 | ||
63 | static int tda8261_get_status(struct dvb_frontend *fe, u32 *status) | |
64 | { | |
65 | struct tda8261_state *state = fe->tuner_priv; | |
66 | u8 result = 0; | |
67 | int err = 0; | |
68 | ||
f6e63827 MA |
69 | *status = 0; |
70 | ||
00360205 | 71 | if ((err = tda8261_read(state, &result)) < 0) { |
eb2e2652 | 72 | pr_err("%s: I/O Error\n", __func__); |
00360205 MA |
73 | return err; |
74 | } | |
75 | if ((result >> 6) & 0x01) { | |
eb2e2652 | 76 | pr_debug("%s: Tuner Phase Locked\n", __func__); |
00360205 MA |
77 | *status = 1; |
78 | } | |
79 | ||
80 | return err; | |
81 | } | |
82 | ||
83 | static const u32 div_tab[] = { 2000, 1000, 500, 250, 125 }; /* kHz */ | |
84 | static const u8 ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 }; | |
85 | ||
86 | static int tda8261_get_state(struct dvb_frontend *fe, | |
87 | enum tuner_param param, | |
88 | struct tuner_state *tstate) | |
89 | { | |
90 | struct tda8261_state *state = fe->tuner_priv; | |
91 | int err = 0; | |
92 | ||
93 | switch (param) { | |
94 | case DVBFE_TUNER_FREQUENCY: | |
95 | tstate->frequency = state->frequency; | |
96 | break; | |
97 | case DVBFE_TUNER_BANDWIDTH: | |
1e3d8abe | 98 | tstate->bandwidth = 40000000; /* FIXME! need to calculate Bandwidth */ |
00360205 MA |
99 | break; |
100 | default: | |
eb2e2652 | 101 | pr_err("%s: Unknown parameter (param=%d)\n", __func__, param); |
00360205 MA |
102 | err = -EINVAL; |
103 | break; | |
104 | } | |
105 | ||
106 | return err; | |
107 | } | |
108 | ||
109 | static int tda8261_set_state(struct dvb_frontend *fe, | |
110 | enum tuner_param param, | |
111 | struct tuner_state *tstate) | |
112 | { | |
113 | struct tda8261_state *state = fe->tuner_priv; | |
41e1151b | 114 | const struct tda8261_config *config = state->config; |
00360205 MA |
115 | u32 frequency, N, status = 0; |
116 | u8 buf[4]; | |
117 | int err = 0; | |
118 | ||
119 | if (param & DVBFE_TUNER_FREQUENCY) { | |
120 | /** | |
121 | * N = Max VCO Frequency / Channel Spacing | |
122 | * Max VCO Frequency = VCO frequency + (channel spacing - 1) | |
123 | * (to account for half channel spacing on either side) | |
124 | */ | |
125 | frequency = tstate->frequency; | |
cf6efeb6 | 126 | if ((frequency < 950000) || (frequency > 2150000)) { |
eb2e2652 | 127 | pr_warn("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency); |
cf6efeb6 MA |
128 | return -EINVAL; |
129 | } | |
00360205 | 130 | N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size]; |
eb2e2652 | 131 | pr_debug("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n", |
c7d85a2d MA |
132 | __func__, config->step_size, div_tab[config->step_size], N, N); |
133 | ||
00360205 MA |
134 | buf[0] = (N >> 8) & 0xff; |
135 | buf[1] = N & 0xff; | |
c7d85a2d | 136 | buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1); |
cf6efeb6 MA |
137 | |
138 | if (frequency < 1450000) | |
139 | buf[3] = 0x00; | |
114323ed | 140 | else if (frequency < 2000000) |
cf6efeb6 | 141 | buf[3] = 0x40; |
114323ed | 142 | else if (frequency < 2150000) |
cf6efeb6 MA |
143 | buf[3] = 0x80; |
144 | ||
00360205 | 145 | /* Set params */ |
00360205 | 146 | if ((err = tda8261_write(state, buf)) < 0) { |
eb2e2652 | 147 | pr_err("%s: I/O Error\n", __func__); |
00360205 MA |
148 | return err; |
149 | } | |
150 | /* sleep for some time */ | |
eb2e2652 | 151 | pr_debug("%s: Waiting to Phase LOCK\n", __func__); |
c7d85a2d | 152 | msleep(20); |
00360205 MA |
153 | /* check status */ |
154 | if ((err = tda8261_get_status(fe, &status)) < 0) { | |
eb2e2652 | 155 | pr_err("%s: I/O Error\n", __func__); |
00360205 MA |
156 | return err; |
157 | } | |
0b8f15dc | 158 | if (status == 1) { |
eb2e2652 | 159 | pr_debug("%s: Tuner Phase locked: status=%d\n", __func__, status); |
c7d85a2d | 160 | state->frequency = frequency; /* cache successful state */ |
0b8f15dc | 161 | } else { |
eb2e2652 | 162 | pr_debug("%s: No Phase lock: status=%d\n", __func__, status); |
0b8f15dc | 163 | } |
00360205 | 164 | } else { |
eb2e2652 | 165 | pr_err("%s: Unknown parameter (param=%d)\n", __func__, param); |
00360205 MA |
166 | return -EINVAL; |
167 | } | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static int tda8261_release(struct dvb_frontend *fe) | |
173 | { | |
174 | struct tda8261_state *state = fe->tuner_priv; | |
175 | ||
176 | fe->tuner_priv = NULL; | |
177 | kfree(state); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static struct dvb_tuner_ops tda8261_ops = { | |
182 | ||
183 | .info = { | |
184 | .name = "TDA8261", | |
185 | // .tuner_name = NULL, | |
186 | .frequency_min = 950000, | |
187 | .frequency_max = 2150000, | |
188 | .frequency_step = 0 | |
189 | }, | |
190 | ||
191 | .set_state = tda8261_set_state, | |
192 | .get_state = tda8261_get_state, | |
f6e63827 | 193 | .get_status = tda8261_get_status, |
00360205 MA |
194 | .release = tda8261_release |
195 | }; | |
196 | ||
197 | struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe, | |
41e1151b | 198 | const struct tda8261_config *config, |
00360205 MA |
199 | struct i2c_adapter *i2c) |
200 | { | |
201 | struct tda8261_state *state = NULL; | |
202 | ||
203 | if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL) | |
204 | goto exit; | |
205 | ||
206 | state->config = config; | |
207 | state->i2c = i2c; | |
208 | state->fe = fe; | |
209 | fe->tuner_priv = state; | |
210 | fe->ops.tuner_ops = tda8261_ops; | |
211 | ||
212 | fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size]; | |
213 | // fe->ops.tuner_ops.tuner_name = &config->buf; | |
214 | ||
215 | // printk("%s: Attaching %s TDA8261 8PSK/QPSK tuner\n", | |
216 | // __func__, fe->ops.tuner_ops.tuner_name); | |
eb2e2652 | 217 | pr_info("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__); |
00360205 | 218 | |
00360205 MA |
219 | return fe; |
220 | ||
221 | exit: | |
222 | kfree(state); | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | EXPORT_SYMBOL(tda8261_attach); | |
00360205 MA |
227 | |
228 | MODULE_AUTHOR("Manu Abraham"); | |
229 | MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner"); | |
230 | MODULE_LICENSE("GPL"); |