[media] a8293: Allegro A8293 SEC driver

Signed-off-by: Antti Palosaari <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb/frontends/Kconfig

···
 	help
 	  A SEC controller chip from Intersil
 
+config DVB_A8293
+	tristate "Allegro A8293"
+	depends on DVB_CORE && I2C
+	default m if DVB_FE_CUSTOMISE
+
 config DVB_LGS8GL5
 	tristate "Silicon Legend LGS-8GL5 demodulator (OFDM)"
 	depends on DVB_CORE && I2C

drivers/media/dvb/frontends/Makefile

···
 obj-$(CONFIG_DVB_DRXK) += drxk.o
 obj-$(CONFIG_DVB_TDA18271C2DD) += tda18271c2dd.o
 obj-$(CONFIG_DVB_IT913X_FE) += it913x-fe.o
+obj-$(CONFIG_DVB_A8293) += a8293.o
 

drivers/media/dvb/frontends/a8293.c

···
+/*
+ * Allegro A8293 SEC driver
+ *
+ * Copyright (C) 2011 Antti Palosaari <[e-mail]>
+ *
+ *    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"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
+
+#define LOG_PREFIX "a8293"
+
+#undef dbg
+#define dbg(f, arg...) \
+	if (debug) \
+		printk(KERN_INFO   LOG_PREFIX": " f "\n" , ## arg)
+#undef err
+#define err(f, arg...)  printk(KERN_ERR     LOG_PREFIX": " f "\n" , ## arg)
+#undef info
+#define info(f, arg...) printk(KERN_INFO    LOG_PREFIX": " f "\n" , ## arg)
+#undef warn
+#define warn(f, arg...) printk(KERN_WARNING LOG_PREFIX": " f "\n" , ## arg)
+
+
+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 {
+		warn("i2c failed=%d rd=%d", 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;
+
+	dbg("%s: fe_sec_voltage=%d", __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;
+
+	return ret;
+err:
+	dbg("%s: failed=%d", __func__, ret);
+	return ret;
+}
+
+static void a8293_release_sec(struct dvb_frontend *fe)
+{
+	dbg("%s:", __func__);
+
+	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[1], 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;
+
+	info("Allegro A8293 SEC attached.");
+
+	fe->ops.release_sec = a8293_release_sec;
+
+	/* override frontend ops */
+	fe->ops.set_voltage = a8293_set_voltage;
+
+	return fe;
+err:
+	dbg("%s: failed=%d", __func__, ret);
+	kfree(priv);
+	return NULL;
+}
+EXPORT_SYMBOL(a8293_attach);
+
+MODULE_AUTHOR("Antti Palosaari <[e-mail]>");
+MODULE_DESCRIPTION("Allegro A8293 SEC driver");
+MODULE_LICENSE("GPL");

drivers/media/dvb/frontends/a8293.h

···
+/*
+ * Allegro A8293 SEC driver
+ *
+ * Copyright (C) 2011 Antti Palosaari <[e-mail]>
+ *
+ *    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.
+ */
+
+#ifndef A8293_H
+#define A8293_H
+
+struct a8293_config {
+	u8 i2c_addr;
+};
+
+#if defined(CONFIG_DVB_A8293) || \
+	(defined(CONFIG_DVB_A8293_MODULE) && defined(MODULE))
+extern struct dvb_frontend *a8293_attach(struct dvb_frontend *fe,
+	struct i2c_adapter *i2c, const struct a8293_config *cfg);
+#else
+static inline struct dvb_frontend *a8293_attach(struct dvb_frontend *fe,
+	struct i2c_adapter *i2c, const struct a8293_config *cfg)
+{
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif
+
+#endif /* A8293_H */