V4L/DVB (3933): Add isl6421 module

Driver for the ISL6421 LNB chip

Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 149 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/isl6421.c b/drivers/media/dvb/frontends/isl6421.c
new file mode 100644
index 000000000000..36992077aaf0
--- /dev/null
+++ b/drivers/media/dvb/frontends/isl6421.c
@@ -0,0 +1,149 @@
+/*
+ * isl6421.h - driver for lnb supply and control ic ISL6421
+ *
+ * Copyright (C) 2006 Andrew de Quincey
+ * Copyright (C) 2006 Oliver Endriss
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
+ *
+ *
+ * the project's page is at http://www.linuxtv.org
+ */
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include "dvb_frontend.h"
+#include "isl6421.h"
+
+struct isl6421 {
+        u8                      config;
+        u8                      override_or;
+        u8                      override_and;
+        struct i2c_adapter      *i2c;
+        u8                      i2c_addr;
+        void                    (*release_chain)(struct dvb_frontend* fe);
+};
+
+static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
+{
+        struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
+        struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
+                                .buf = &isl6421->config,
+                                .len = sizeof(isl6421->config) };
+
+        isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
+
+        switch(voltage) {
+        case SEC_VOLTAGE_OFF:
+                break;
+        case SEC_VOLTAGE_13:
+                isl6421->config |= ISL6421_EN1;
+                break;
+        case SEC_VOLTAGE_18:
+                isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
+                break;
+        default:
+                return -EINVAL;
+        };
+
+        isl6421->config |= isl6421->override_or;
+        isl6421->config &= isl6421->override_and;
+
+        return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
+}
+
+static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
+{
+        struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
+        struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
+                                .buf = &isl6421->config,
+                                .len = sizeof(isl6421->config) };
+
+        if (arg)
+                isl6421->config |= ISL6421_LLC1;
+        else
+                isl6421->config &= ~ISL6421_LLC1;
+
+        isl6421->config |= isl6421->override_or;
+        isl6421->config &= isl6421->override_and;
+
+        return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
+}
+
+static void isl6421_release(struct dvb_frontend *fe)
+{
+        struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
+
+        /* power off */
+        isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
+
+        /* free data & call next release routine */
+        fe->ops->release = isl6421->release_chain;
+        kfree(fe->misc_priv);
+        fe->misc_priv = NULL;
+        if (fe->ops->release)
+                fe->ops->release(fe);
+}
+
+int isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
+                   u8 override_set, u8 override_clear)
+{
+        struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
+        if (!isl6421)
+                return -ENOMEM;
+
+        /* default configuration */
+        isl6421->config = ISL6421_ISEL1;
+        isl6421->i2c = i2c;
+        isl6421->i2c_addr = i2c_addr;
+        fe->misc_priv = isl6421;
+
+        /* bits which should be forced to '1' */
+        isl6421->override_or = override_set;
+
+        /* bits which should be forced to '0' */
+        isl6421->override_and = ~override_clear;
+
+        /* detect if it is present or not */
+        if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
+                kfree(isl6421);
+                fe->misc_priv = NULL;
+                return -EIO;
+        }
+
+        /* install release callback */
+        isl6421->release_chain = fe->ops->release;
+        fe->ops->release = isl6421_release;
+
+        /* override frontend ops */
+        fe->ops->set_voltage = isl6421_set_voltage;
+        fe->ops->enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
+
+        return 0;
+}
+EXPORT_SYMBOL(isl6421_attach);
+
+MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
+MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
+MODULE_LICENSE("GPL");