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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 | ||
e417668d | 86 | static int tda8261_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
00360205 MA |
87 | { |
88 | struct tda8261_state *state = fe->tuner_priv; | |
00360205 | 89 | |
e417668d | 90 | *frequency = state->frequency; |
00360205 | 91 | |
e417668d | 92 | return 0; |
00360205 MA |
93 | } |
94 | ||
e417668d | 95 | static int tda8261_set_params(struct dvb_frontend *fe) |
00360205 | 96 | { |
e417668d | 97 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
00360205 | 98 | struct tda8261_state *state = fe->tuner_priv; |
41e1151b | 99 | const struct tda8261_config *config = state->config; |
00360205 MA |
100 | u32 frequency, N, status = 0; |
101 | u8 buf[4]; | |
102 | int err = 0; | |
103 | ||
e417668d MCC |
104 | /* |
105 | * N = Max VCO Frequency / Channel Spacing | |
106 | * Max VCO Frequency = VCO frequency + (channel spacing - 1) | |
107 | * (to account for half channel spacing on either side) | |
108 | */ | |
109 | frequency = c->frequency; | |
110 | if ((frequency < 950000) || (frequency > 2150000)) { | |
111 | pr_warn("%s: Frequency beyond limits, frequency=%d\n", | |
112 | __func__, frequency); | |
00360205 MA |
113 | return -EINVAL; |
114 | } | |
e417668d MCC |
115 | N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size]; |
116 | pr_debug("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n", | |
117 | __func__, config->step_size, div_tab[config->step_size], N, N); | |
118 | ||
119 | buf[0] = (N >> 8) & 0xff; | |
120 | buf[1] = N & 0xff; | |
121 | buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1); | |
122 | ||
123 | if (frequency < 1450000) | |
124 | buf[3] = 0x00; | |
125 | else if (frequency < 2000000) | |
126 | buf[3] = 0x40; | |
127 | else if (frequency < 2150000) | |
128 | buf[3] = 0x80; | |
129 | ||
130 | /* Set params */ | |
131 | err = tda8261_write(state, buf); | |
132 | if (err < 0) { | |
133 | pr_err("%s: I/O Error\n", __func__); | |
134 | return err; | |
135 | } | |
136 | /* sleep for some time */ | |
137 | pr_debug("%s: Waiting to Phase LOCK\n", __func__); | |
138 | msleep(20); | |
139 | /* check status */ | |
140 | if ((err = tda8261_get_status(fe, &status)) < 0) { | |
141 | pr_err("%s: I/O Error\n", __func__); | |
142 | return err; | |
143 | } | |
144 | if (status == 1) { | |
145 | pr_debug("%s: Tuner Phase locked: status=%d\n", __func__, | |
146 | status); | |
147 | state->frequency = frequency; /* cache successful state */ | |
148 | } else { | |
149 | pr_debug("%s: No Phase lock: status=%d\n", __func__, status); | |
150 | } | |
00360205 MA |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static int tda8261_release(struct dvb_frontend *fe) | |
156 | { | |
157 | struct tda8261_state *state = fe->tuner_priv; | |
158 | ||
159 | fe->tuner_priv = NULL; | |
160 | kfree(state); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static struct dvb_tuner_ops tda8261_ops = { | |
165 | ||
166 | .info = { | |
167 | .name = "TDA8261", | |
00360205 MA |
168 | .frequency_min = 950000, |
169 | .frequency_max = 2150000, | |
170 | .frequency_step = 0 | |
171 | }, | |
172 | ||
e417668d MCC |
173 | .set_params = tda8261_set_params, |
174 | .get_frequency = tda8261_get_frequency, | |
f6e63827 | 175 | .get_status = tda8261_get_status, |
00360205 MA |
176 | .release = tda8261_release |
177 | }; | |
178 | ||
179 | struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe, | |
41e1151b | 180 | const struct tda8261_config *config, |
00360205 MA |
181 | struct i2c_adapter *i2c) |
182 | { | |
183 | struct tda8261_state *state = NULL; | |
184 | ||
185 | if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL) | |
186 | goto exit; | |
187 | ||
188 | state->config = config; | |
189 | state->i2c = i2c; | |
190 | state->fe = fe; | |
191 | fe->tuner_priv = state; | |
192 | fe->ops.tuner_ops = tda8261_ops; | |
193 | ||
194 | fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size]; | |
00360205 | 195 | |
eb2e2652 | 196 | pr_info("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__); |
00360205 | 197 | |
00360205 MA |
198 | return fe; |
199 | ||
200 | exit: | |
201 | kfree(state); | |
202 | return NULL; | |
203 | } | |
204 | ||
205 | EXPORT_SYMBOL(tda8261_attach); | |
00360205 MA |
206 | |
207 | MODULE_AUTHOR("Manu Abraham"); | |
208 | MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner"); | |
209 | MODULE_LICENSE("GPL"); |