1/*
2	TDA665x 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#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24
25#include "dvb_frontend.h"
26#include "tda665x.h"
27
28struct tda665x_state {
29	struct dvb_frontend		*fe;
30	struct i2c_adapter		*i2c;
31	const struct tda665x_config	*config;
32
33	u32 frequency;
34	u32 bandwidth;
35};
36
37static int tda665x_read(struct tda665x_state *state, u8 *buf)
38{
39	const struct tda665x_config *config = state->config;
40	int err = 0;
41	struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 };
42
43	err = i2c_transfer(state->i2c, &msg, 1);
44	if (err != 1)
45		goto exit;
46
47	return err;
48exit:
49	printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
50	return err;
51}
52
53static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length)
54{
55	const struct tda665x_config *config = state->config;
56	int err = 0;
57	struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length };
58
59	err = i2c_transfer(state->i2c, &msg, 1);
60	if (err != 1)
61		goto exit;
62
63	return err;
64exit:
65	printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
66	return err;
67}
68
69static int tda665x_get_state(struct dvb_frontend *fe,
70			     enum tuner_param param,
71			     struct tuner_state *tstate)
72{
73	struct tda665x_state *state = fe->tuner_priv;
74	int err = 0;
75
76	switch (param) {
77	case DVBFE_TUNER_FREQUENCY:
78		tstate->frequency = state->frequency;
79		break;
80	case DVBFE_TUNER_BANDWIDTH:
81		break;
82	default:
83		printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
84		err = -EINVAL;
85		break;
86	}
87
88	return err;
89}
90
91static int tda665x_get_status(struct dvb_frontend *fe, u32 *status)
92{
93	struct tda665x_state *state = fe->tuner_priv;
94	u8 result = 0;
95	int err = 0;
96
97	*status = 0;
98
99	err = tda665x_read(state, &result);
100	if (err < 0)
101		goto exit;
102
103	if ((result >> 6) & 0x01) {
104		printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__);
105		*status = 1;
106	}
107
108	return err;
109exit:
110	printk(KERN_ERR "%s: I/O Error\n", __func__);
111	return err;
112}
113
114static int tda665x_set_state(struct dvb_frontend *fe,
115			     enum tuner_param param,
116			     struct tuner_state *tstate)
117{
118	struct tda665x_state *state = fe->tuner_priv;
119	const struct tda665x_config *config = state->config;
120	u32 frequency, status = 0;
121	u8 buf[4];
122	int err = 0;
123
124	if (param & DVBFE_TUNER_FREQUENCY) {
125
126		frequency = tstate->frequency;
127		if ((frequency < config->frequency_max) || (frequency > config->frequency_min)) {
128			printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
129			return -EINVAL;
130		}
131
132		frequency += config->frequency_offst;
133		frequency *= config->ref_multiplier;
134		frequency += config->ref_divider >> 1;
135		frequency /= config->ref_divider;
136
137		buf[0] = (u8) ((frequency & 0x7f00) >> 8);
138		buf[1] = (u8) (frequency & 0x00ff) >> 0;
139		buf[2] = 0x80 | 0x40 | 0x02;
140		buf[3] = 0x00;
141
142		/* restore frequency */
143		frequency = tstate->frequency;
144
145		if (frequency < 153000000) {
146			/* VHF-L */
147			buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */
148			if (frequency < 68000000)
149				buf[3] |= 0x40; /* 83uA */
150			if (frequency < 1040000000)
151				buf[3] |= 0x60; /* 122uA */
152			if (frequency < 1250000000)
153				buf[3] |= 0x80; /* 163uA */
154			else
155				buf[3] |= 0xa0; /* 254uA */
156		} else if (frequency < 438000000) {
157			/* VHF-H */
158			buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */
159			if (frequency < 230000000)
160				buf[3] |= 0x40;
161			if (frequency < 300000000)
162				buf[3] |= 0x60;
163			else
164				buf[3] |= 0x80;
165		} else {
166			/* UHF */
167			buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */
168			if (frequency < 470000000)
169				buf[3] |= 0x60;
170			if (frequency < 526000000)
171				buf[3] |= 0x80;
172			else
173				buf[3] |= 0xa0;
174		}
175
176		/* Set params */
177		err = tda665x_write(state, buf, 5);
178		if (err < 0)
179			goto exit;
180
181		/* sleep for some time */
182		printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__);
183		msleep(20);
184		/* check status */
185		err = tda665x_get_status(fe, &status);
186		if (err < 0)
187			goto exit;
188
189		if (status == 1) {
190			printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n", __func__, status);
191			state->frequency = frequency; /* cache successful state */
192		} else {
193			printk(KERN_ERR "%s: No Phase lock: status=%d\n", __func__, status);
194		}
195	} else {
196		printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
197		return -EINVAL;
198	}
199
200	return 0;
201exit:
202	printk(KERN_ERR "%s: I/O Error\n", __func__);
203	return err;
204}
205
206static int tda665x_release(struct dvb_frontend *fe)
207{
208	struct tda665x_state *state = fe->tuner_priv;
209
210	fe->tuner_priv = NULL;
211	kfree(state);
212	return 0;
213}
214
215static struct dvb_tuner_ops tda665x_ops = {
216
217	.set_state	= tda665x_set_state,
218	.get_state	= tda665x_get_state,
219	.get_status	= tda665x_get_status,
220	.release	= tda665x_release
221};
222
223struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe,
224				    const struct tda665x_config *config,
225				    struct i2c_adapter *i2c)
226{
227	struct tda665x_state *state = NULL;
228	struct dvb_tuner_info *info;
229
230	state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL);
231	if (!state)
232		return NULL;
233
234	state->config		= config;
235	state->i2c		= i2c;
236	state->fe		= fe;
237	fe->tuner_priv		= state;
238	fe->ops.tuner_ops	= tda665x_ops;
239	info			 = &fe->ops.tuner_ops.info;
240
241	memcpy(info->name, config->name, sizeof(config->name));
242	info->frequency_min	= config->frequency_min;
243	info->frequency_max	= config->frequency_max;
244	info->frequency_step	= config->frequency_offst;
245
246	printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name);
247
248	return fe;
249}
250EXPORT_SYMBOL(tda665x_attach);
251
252MODULE_DESCRIPTION("TDA665x driver");
253MODULE_AUTHOR("Manu Abraham");
254MODULE_LICENSE("GPL");
255