1/*
2 * Allegro A8293 SEC driver
3 *
4 * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
5 *
6 *    This program is free software; you can redistribute it and/or modify
7 *    it under the terms of the GNU General Public License as published by
8 *    the Free Software Foundation; either version 2 of the License, or
9 *    (at your option) any later version.
10 *
11 *    This program is distributed in the hope that it will be useful,
12 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *    GNU General Public License for more details.
15 *
16 *    You should have received a copy of the GNU General Public License along
17 *    with this program; if not, write to the Free Software Foundation, Inc.,
18 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21#include "dvb_frontend.h"
22#include "a8293.h"
23
24static int debug;
25module_param(debug, int, 0644);
26MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
27
28#define LOG_PREFIX "a8293"
29
30#undef dbg
31#define dbg(f, arg...) \
32	if (debug) \
33		printk(KERN_INFO   LOG_PREFIX": " f "\n" , ## arg)
34#undef err
35#define err(f, arg...)  printk(KERN_ERR     LOG_PREFIX": " f "\n" , ## arg)
36#undef info
37#define info(f, arg...) printk(KERN_INFO    LOG_PREFIX": " f "\n" , ## arg)
38#undef warn
39#define warn(f, arg...) printk(KERN_WARNING LOG_PREFIX": " f "\n" , ## arg)
40
41
42struct a8293_priv {
43	struct i2c_adapter *i2c;
44	const struct a8293_config *cfg;
45	u8 reg[2];
46};
47
48static int a8293_i2c(struct a8293_priv *priv, u8 *val, int len, bool rd)
49{
50	int ret;
51	struct i2c_msg msg[1] = {
52		{
53			.addr = priv->cfg->i2c_addr,
54			.len = len,
55			.buf = val,
56		}
57	};
58
59	if (rd)
60		msg[0].flags = I2C_M_RD;
61	else
62		msg[0].flags = 0;
63
64	ret = i2c_transfer(priv->i2c, msg, 1);
65	if (ret == 1) {
66		ret = 0;
67	} else {
68		warn("i2c failed=%d rd=%d", ret, rd);
69		ret = -EREMOTEIO;
70	}
71
72	return ret;
73}
74
75static int a8293_wr(struct a8293_priv *priv, u8 *val, int len)
76{
77	return a8293_i2c(priv, val, len, 0);
78}
79
80static int a8293_rd(struct a8293_priv *priv, u8 *val, int len)
81{
82	return a8293_i2c(priv, val, len, 1);
83}
84
85static int a8293_set_voltage(struct dvb_frontend *fe,
86	fe_sec_voltage_t fe_sec_voltage)
87{
88	struct a8293_priv *priv = fe->sec_priv;
89	int ret;
90
91	dbg("%s: fe_sec_voltage=%d", __func__, fe_sec_voltage);
92
93	switch (fe_sec_voltage) {
94	case SEC_VOLTAGE_OFF:
95		/* ENB=0 */
96		priv->reg[0] = 0x10;
97		break;
98	case SEC_VOLTAGE_13:
99		/* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
100		priv->reg[0] = 0x31;
101		break;
102	case SEC_VOLTAGE_18:
103		/* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
104		priv->reg[0] = 0x38;
105		break;
106	default:
107		ret = -EINVAL;
108		goto err;
109	};
110
111	ret = a8293_wr(priv, &priv->reg[0], 1);
112	if (ret)
113		goto err;
114
115	return ret;
116err:
117	dbg("%s: failed=%d", __func__, ret);
118	return ret;
119}
120
121static void a8293_release_sec(struct dvb_frontend *fe)
122{
123	dbg("%s:", __func__);
124
125	a8293_set_voltage(fe, SEC_VOLTAGE_OFF);
126
127	kfree(fe->sec_priv);
128	fe->sec_priv = NULL;
129}
130
131struct dvb_frontend *a8293_attach(struct dvb_frontend *fe,
132	struct i2c_adapter *i2c, const struct a8293_config *cfg)
133{
134	int ret;
135	struct a8293_priv *priv = NULL;
136	u8 buf[2];
137
138	/* allocate memory for the internal priv */
139	priv = kzalloc(sizeof(struct a8293_priv), GFP_KERNEL);
140	if (priv == NULL) {
141		ret = -ENOMEM;
142		goto err;
143	}
144
145	/* setup the priv */
146	priv->i2c = i2c;
147	priv->cfg = cfg;
148	fe->sec_priv = priv;
149
150	/* check if the SEC is there */
151	ret = a8293_rd(priv, buf, 2);
152	if (ret)
153		goto err;
154
155	/* ENB=0 */
156	priv->reg[0] = 0x10;
157	ret = a8293_wr(priv, &priv->reg[1], 1);
158	if (ret)
159		goto err;
160
161	/* TMODE=0, TGATE=1 */
162	priv->reg[1] = 0x82;
163	ret = a8293_wr(priv, &priv->reg[1], 1);
164	if (ret)
165		goto err;
166
167	info("Allegro A8293 SEC attached.");
168
169	fe->ops.release_sec = a8293_release_sec;
170
171	/* override frontend ops */
172	fe->ops.set_voltage = a8293_set_voltage;
173
174	return fe;
175err:
176	dbg("%s: failed=%d", __func__, ret);
177	kfree(priv);
178	return NULL;
179}
180EXPORT_SYMBOL(a8293_attach);
181
182MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
183MODULE_DESCRIPTION("Allegro A8293 SEC driver");
184MODULE_LICENSE("GPL");
185