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
24struct a8293_priv {
25	struct i2c_adapter *i2c;
26	const struct a8293_config *cfg;
27	u8 reg[2];
28};
29
30static int a8293_i2c(struct a8293_priv *priv, u8 *val, int len, bool rd)
31{
32	int ret;
33	struct i2c_msg msg[1] = {
34		{
35			.addr = priv->cfg->i2c_addr,
36			.len = len,
37			.buf = val,
38		}
39	};
40
41	if (rd)
42		msg[0].flags = I2C_M_RD;
43	else
44		msg[0].flags = 0;
45
46	ret = i2c_transfer(priv->i2c, msg, 1);
47	if (ret == 1) {
48		ret = 0;
49	} else {
50		dev_warn(&priv->i2c->dev, "%s: i2c failed=%d rd=%d\n",
51				KBUILD_MODNAME, ret, rd);
52		ret = -EREMOTEIO;
53	}
54
55	return ret;
56}
57
58static int a8293_wr(struct a8293_priv *priv, u8 *val, int len)
59{
60	return a8293_i2c(priv, val, len, 0);
61}
62
63static int a8293_rd(struct a8293_priv *priv, u8 *val, int len)
64{
65	return a8293_i2c(priv, val, len, 1);
66}
67
68static int a8293_set_voltage(struct dvb_frontend *fe,
69	fe_sec_voltage_t fe_sec_voltage)
70{
71	struct a8293_priv *priv = fe->sec_priv;
72	int ret;
73
74	dev_dbg(&priv->i2c->dev, "%s: fe_sec_voltage=%d\n", __func__,
75			fe_sec_voltage);
76
77	switch (fe_sec_voltage) {
78	case SEC_VOLTAGE_OFF:
79		/* ENB=0 */
80		priv->reg[0] = 0x10;
81		break;
82	case SEC_VOLTAGE_13:
83		/* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
84		priv->reg[0] = 0x31;
85		break;
86	case SEC_VOLTAGE_18:
87		/* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
88		priv->reg[0] = 0x38;
89		break;
90	default:
91		ret = -EINVAL;
92		goto err;
93	}
94
95	ret = a8293_wr(priv, &priv->reg[0], 1);
96	if (ret)
97		goto err;
98
99	usleep_range(1500, 50000);
100
101	return ret;
102err:
103	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
104	return ret;
105}
106
107static void a8293_release_sec(struct dvb_frontend *fe)
108{
109	a8293_set_voltage(fe, SEC_VOLTAGE_OFF);
110
111	kfree(fe->sec_priv);
112	fe->sec_priv = NULL;
113}
114
115struct dvb_frontend *a8293_attach(struct dvb_frontend *fe,
116	struct i2c_adapter *i2c, const struct a8293_config *cfg)
117{
118	int ret;
119	struct a8293_priv *priv = NULL;
120	u8 buf[2];
121
122	/* allocate memory for the internal priv */
123	priv = kzalloc(sizeof(struct a8293_priv), GFP_KERNEL);
124	if (priv == NULL) {
125		ret = -ENOMEM;
126		goto err;
127	}
128
129	/* setup the priv */
130	priv->i2c = i2c;
131	priv->cfg = cfg;
132	fe->sec_priv = priv;
133
134	/* check if the SEC is there */
135	ret = a8293_rd(priv, buf, 2);
136	if (ret)
137		goto err;
138
139	/* ENB=0 */
140	priv->reg[0] = 0x10;
141	ret = a8293_wr(priv, &priv->reg[0], 1);
142	if (ret)
143		goto err;
144
145	/* TMODE=0, TGATE=1 */
146	priv->reg[1] = 0x82;
147	ret = a8293_wr(priv, &priv->reg[1], 1);
148	if (ret)
149		goto err;
150
151	fe->ops.release_sec = a8293_release_sec;
152
153	/* override frontend ops */
154	fe->ops.set_voltage = a8293_set_voltage;
155
156	dev_info(&priv->i2c->dev, "%s: Allegro A8293 SEC attached\n",
157			KBUILD_MODNAME);
158
159	return fe;
160err:
161	dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
162	kfree(priv);
163	return NULL;
164}
165EXPORT_SYMBOL(a8293_attach);
166
167MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
168MODULE_DESCRIPTION("Allegro A8293 SEC driver");
169MODULE_LICENSE("GPL");
170