blob: 19c488814e5c78e5b7e87e78419190d8e40faa11 [file] [log] [blame]
Manu Abraham00360202007-09-22 13:30:09 -03001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Manu Abraham00360202007-09-22 13:30:09 -030025
26#include "dvb_frontend.h"
27#include "tda8261.h"
28
29struct tda8261_state {
Manu Abraham41e11512007-09-22 21:28:11 -030030 struct dvb_frontend *fe;
31 struct i2c_adapter *i2c;
32 const struct tda8261_config *config;
Manu Abraham00360202007-09-22 13:30:09 -030033
34 /* state cache */
35 u32 frequency;
36 u32 bandwidth;
37};
38
39static int tda8261_read(struct tda8261_state *state, u8 *buf)
40{
Manu Abraham41e11512007-09-22 21:28:11 -030041 const struct tda8261_config *config = state->config;
Manu Abraham00360202007-09-22 13:30:09 -030042 int err = 0;
Arvo Järve225ee0c2010-01-10 17:15:57 -030043 struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 1 };
Manu Abraham00360202007-09-22 13:30:09 -030044
Manu Abrahamc7d85a22007-09-24 13:27:06 -030045 if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
Alan Coxeb2e2652012-09-02 03:30:15 -030046 pr_err("%s: read error, err=%d\n", __func__, err);
Manu Abraham00360202007-09-22 13:30:09 -030047
48 return err;
49}
50
51static int tda8261_write(struct tda8261_state *state, u8 *buf)
52{
Manu Abraham41e11512007-09-22 21:28:11 -030053 const struct tda8261_config *config = state->config;
Manu Abraham00360202007-09-22 13:30:09 -030054 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)
Alan Coxeb2e2652012-09-02 03:30:15 -030058 pr_err("%s: write error, err=%d\n", __func__, err);
Manu Abraham00360202007-09-22 13:30:09 -030059
60 return err;
61}
62
63static 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
Manu Abrahamf6e63822007-09-28 19:06:06 -030069 *status = 0;
70
Manu Abraham00360202007-09-22 13:30:09 -030071 if ((err = tda8261_read(state, &result)) < 0) {
Alan Coxeb2e2652012-09-02 03:30:15 -030072 pr_err("%s: I/O Error\n", __func__);
Manu Abraham00360202007-09-22 13:30:09 -030073 return err;
74 }
75 if ((result >> 6) & 0x01) {
Alan Coxeb2e2652012-09-02 03:30:15 -030076 pr_debug("%s: Tuner Phase Locked\n", __func__);
Manu Abraham00360202007-09-22 13:30:09 -030077 *status = 1;
78 }
79
80 return err;
81}
82
83static const u32 div_tab[] = { 2000, 1000, 500, 250, 125 }; /* kHz */
84static const u8 ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 };
85
86static 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:
Arvo Jarve1e3d8ab2007-10-30 10:21:33 -030098 tstate->bandwidth = 40000000; /* FIXME! need to calculate Bandwidth */
Manu Abraham00360202007-09-22 13:30:09 -030099 break;
100 default:
Alan Coxeb2e2652012-09-02 03:30:15 -0300101 pr_err("%s: Unknown parameter (param=%d)\n", __func__, param);
Manu Abraham00360202007-09-22 13:30:09 -0300102 err = -EINVAL;
103 break;
104 }
105
106 return err;
107}
108
109static 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;
Manu Abraham41e11512007-09-22 21:28:11 -0300114 const struct tda8261_config *config = state->config;
Manu Abraham00360202007-09-22 13:30:09 -0300115 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;
Manu Abrahamcf6efeb2007-10-08 19:04:03 -0300126 if ((frequency < 950000) || (frequency > 2150000)) {
Alan Coxeb2e2652012-09-02 03:30:15 -0300127 pr_warn("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
Manu Abrahamcf6efeb2007-10-08 19:04:03 -0300128 return -EINVAL;
129 }
Manu Abraham00360202007-09-22 13:30:09 -0300130 N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
Alan Coxeb2e2652012-09-02 03:30:15 -0300131 pr_debug("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n",
Manu Abrahamc7d85a22007-09-24 13:27:06 -0300132 __func__, config->step_size, div_tab[config->step_size], N, N);
133
Manu Abraham00360202007-09-22 13:30:09 -0300134 buf[0] = (N >> 8) & 0xff;
135 buf[1] = N & 0xff;
Manu Abrahamc7d85a22007-09-24 13:27:06 -0300136 buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1);
Manu Abrahamcf6efeb2007-10-08 19:04:03 -0300137
138 if (frequency < 1450000)
139 buf[3] = 0x00;
Julian Scheel114323e2009-07-31 13:40:43 -0300140 else if (frequency < 2000000)
Manu Abrahamcf6efeb2007-10-08 19:04:03 -0300141 buf[3] = 0x40;
Julian Scheel114323e2009-07-31 13:40:43 -0300142 else if (frequency < 2150000)
Manu Abrahamcf6efeb2007-10-08 19:04:03 -0300143 buf[3] = 0x80;
144
Manu Abraham00360202007-09-22 13:30:09 -0300145 /* Set params */
Manu Abraham00360202007-09-22 13:30:09 -0300146 if ((err = tda8261_write(state, buf)) < 0) {
Alan Coxeb2e2652012-09-02 03:30:15 -0300147 pr_err("%s: I/O Error\n", __func__);
Manu Abraham00360202007-09-22 13:30:09 -0300148 return err;
149 }
150 /* sleep for some time */
Alan Coxeb2e2652012-09-02 03:30:15 -0300151 pr_debug("%s: Waiting to Phase LOCK\n", __func__);
Manu Abrahamc7d85a22007-09-24 13:27:06 -0300152 msleep(20);
Manu Abraham00360202007-09-22 13:30:09 -0300153 /* check status */
154 if ((err = tda8261_get_status(fe, &status)) < 0) {
Alan Coxeb2e2652012-09-02 03:30:15 -0300155 pr_err("%s: I/O Error\n", __func__);
Manu Abraham00360202007-09-22 13:30:09 -0300156 return err;
157 }
Manu Abraham0b8f15d2007-09-22 13:36:34 -0300158 if (status == 1) {
Alan Coxeb2e2652012-09-02 03:30:15 -0300159 pr_debug("%s: Tuner Phase locked: status=%d\n", __func__, status);
Manu Abrahamc7d85a22007-09-24 13:27:06 -0300160 state->frequency = frequency; /* cache successful state */
Manu Abraham0b8f15d2007-09-22 13:36:34 -0300161 } else {
Alan Coxeb2e2652012-09-02 03:30:15 -0300162 pr_debug("%s: No Phase lock: status=%d\n", __func__, status);
Manu Abraham0b8f15d2007-09-22 13:36:34 -0300163 }
Manu Abraham00360202007-09-22 13:30:09 -0300164 } else {
Alan Coxeb2e2652012-09-02 03:30:15 -0300165 pr_err("%s: Unknown parameter (param=%d)\n", __func__, param);
Manu Abraham00360202007-09-22 13:30:09 -0300166 return -EINVAL;
167 }
168
169 return 0;
170}
171
172static 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
181static 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,
Manu Abrahamf6e63822007-09-28 19:06:06 -0300193 .get_status = tda8261_get_status,
Manu Abraham00360202007-09-22 13:30:09 -0300194 .release = tda8261_release
195};
196
197struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
Manu Abraham41e11512007-09-22 21:28:11 -0300198 const struct tda8261_config *config,
Manu Abraham00360202007-09-22 13:30:09 -0300199 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);
Alan Coxeb2e2652012-09-02 03:30:15 -0300217 pr_info("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
Manu Abraham00360202007-09-22 13:30:09 -0300218
Manu Abraham00360202007-09-22 13:30:09 -0300219 return fe;
220
221exit:
222 kfree(state);
223 return NULL;
224}
225
226EXPORT_SYMBOL(tda8261_attach);
Manu Abraham00360202007-09-22 13:30:09 -0300227
228MODULE_AUTHOR("Manu Abraham");
229MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
230MODULE_LICENSE("GPL");