[mirror_ubuntu-artful-kernel.git] / drivers / media / dvb-frontends / a8293.c

/*
 * Allegro A8293 SEC driver
 *
 * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "dvb_frontend.h"
#include "a8293.h"

struct a8293_priv {
	struct i2c_adapter *i2c;
	const struct a8293_config *cfg;
	u8 reg[2];
};

static int a8293_i2c(struct a8293_priv *priv, u8 *val, int len, bool rd)
{
	int ret;
	struct i2c_msg msg[1] = {
		{
			.addr = priv->cfg->i2c_addr,
			.len = len,
			.buf = val,
		}
	};

	if (rd)
		msg[0].flags = I2C_M_RD;
	else
		msg[0].flags = 0;

	ret = i2c_transfer(priv->i2c, msg, 1);
	if (ret == 1) {
		ret = 0;
	} else {
		dev_warn(&priv->i2c->dev, "%s: i2c failed=%d rd=%d\n",
				KBUILD_MODNAME, ret, rd);
		ret = -EREMOTEIO;
	}

	return ret;
}

static int a8293_wr(struct a8293_priv *priv, u8 *val, int len)
{
	return a8293_i2c(priv, val, len, 0);
}

static int a8293_rd(struct a8293_priv *priv, u8 *val, int len)
{
	return a8293_i2c(priv, val, len, 1);
}

static int a8293_set_voltage(struct dvb_frontend *fe,
	fe_sec_voltage_t fe_sec_voltage)
{
	struct a8293_priv *priv = fe->sec_priv;
	int ret;

	dev_dbg(&priv->i2c->dev, "%s: fe_sec_voltage=%d\n", __func__,
			fe_sec_voltage);

	switch (fe_sec_voltage) {
	case SEC_VOLTAGE_OFF:
		/* ENB=0 */
		priv->reg[0] = 0x10;
		break;
	case SEC_VOLTAGE_13:
		/* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
		priv->reg[0] = 0x31;
		break;
	case SEC_VOLTAGE_18:
		/* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
		priv->reg[0] = 0x38;
		break;
	default:
		ret = -EINVAL;
		goto err;
	}

	ret = a8293_wr(priv, &priv->reg[0], 1);
	if (ret)
		goto err;

	usleep_range(1500, 50000);

	return ret;
err:
	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
	return ret;
}

static void a8293_release_sec(struct dvb_frontend *fe)
{
	a8293_set_voltage(fe, SEC_VOLTAGE_OFF);

	kfree(fe->sec_priv);
	fe->sec_priv = NULL;
}

struct dvb_frontend *a8293_attach(struct dvb_frontend *fe,
	struct i2c_adapter *i2c, const struct a8293_config *cfg)
{
	int ret;
	struct a8293_priv *priv = NULL;
	u8 buf[2];

	/* allocate memory for the internal priv */
	priv = kzalloc(sizeof(struct a8293_priv), GFP_KERNEL);
	if (priv == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	/* setup the priv */
	priv->i2c = i2c;
	priv->cfg = cfg;
	fe->sec_priv = priv;

	/* check if the SEC is there */
	ret = a8293_rd(priv, buf, 2);
	if (ret)
		goto err;

	/* ENB=0 */
	priv->reg[0] = 0x10;
	ret = a8293_wr(priv, &priv->reg[0], 1);
	if (ret)
		goto err;

	/* TMODE=0, TGATE=1 */
	priv->reg[1] = 0x82;
	ret = a8293_wr(priv, &priv->reg[1], 1);
	if (ret)
		goto err;

	fe->ops.release_sec = a8293_release_sec;

	/* override frontend ops */
	fe->ops.set_voltage = a8293_set_voltage;

	dev_info(&priv->i2c->dev, "%s: Allegro A8293 SEC attached\n",
			KBUILD_MODNAME);

	return fe;
err:
	dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
	kfree(priv);
	return NULL;
}
EXPORT_SYMBOL(a8293_attach);

MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("Allegro A8293 SEC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
85bc9b51 AP	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
85bc9b51 AP	24	struct a8293_priv {
	25	struct i2c_adapter *i2c;
	26	const struct a8293_config *cfg;
	27	u8 reg[2];
	28	};
	29
	30	static 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 {
acc4e826 AP	50	dev_warn(&priv->i2c->dev, "%s: i2c failed=%d rd=%d\n",
acc4e826 AP	51	KBUILD_MODNAME, ret, rd);
85bc9b51 AP	52	ret = -EREMOTEIO;
	53	}
	54
	55	return ret;
	56	}
	57
	58	static int a8293_wr(struct a8293_priv priv, u8 val, int len)
	59	{
	60	return a8293_i2c(priv, val, len, 0);
	61	}
	62
	63	static int a8293_rd(struct a8293_priv priv, u8 val, int len)
	64	{
	65	return a8293_i2c(priv, val, len, 1);
	66	}
	67
	68	static 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
acc4e826 AP	74	dev_dbg(&priv->i2c->dev, "%s: fe_sec_voltage=%d\n", __func__,
acc4e826 AP	75	fe_sec_voltage);
85bc9b51 AP	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;
c2c1b415	93	}
85bc9b51 AP	94
	95	ret = a8293_wr(priv, &priv->reg[0], 1);
	96	if (ret)
	97	goto err;
	98
c0ec1c4d AP	99	usleep_range(1500, 50000);
c0ec1c4d AP	100
85bc9b51 AP	101	return ret;
85bc9b51 AP	102	err:
acc4e826	103	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
85bc9b51 AP	104	return ret;
	105	}
	106
	107	static void a8293_release_sec(struct dvb_frontend *fe)
	108	{
85bc9b51 AP	109	a8293_set_voltage(fe, SEC_VOLTAGE_OFF);
	110
	111	kfree(fe->sec_priv);
	112	fe->sec_priv = NULL;
	113	}
	114
	115	struct 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;
f3e16df6	141	ret = a8293_wr(priv, &priv->reg[0], 1);
85bc9b51 AP	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
85bc9b51 AP	151	fe->ops.release_sec = a8293_release_sec;
	152
	153	/* override frontend ops */
	154	fe->ops.set_voltage = a8293_set_voltage;
	155
acc4e826 AP	156	dev_info(&priv->i2c->dev, "%s: Allegro A8293 SEC attached\n",
	157	KBUILD_MODNAME);
	158
85bc9b51 AP	159	return fe;
85bc9b51 AP	160	err:
acc4e826	161	dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
85bc9b51 AP	162	kfree(priv);
	163	return NULL;
	164	}
	165	EXPORT_SYMBOL(a8293_attach);
	166
	167	MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
	168	MODULE_DESCRIPTION("Allegro A8293 SEC driver");
	169	MODULE_LICENSE("GPL");