From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 drivers/media/pci/saa7164/saa7164-i2c.c | 125 ++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 drivers/media/pci/saa7164/saa7164-i2c.c

(limited to 'drivers/media/pci/saa7164/saa7164-i2c.c')

diff --git a/drivers/media/pci/saa7164/saa7164-i2c.c b/drivers/media/pci/saa7164/saa7164-i2c.c
new file mode 100644
index 000000000..4f7e3b422
--- /dev/null
+++ b/drivers/media/pci/saa7164/saa7164-i2c.c
@@ -0,0 +1,125 @@
+/*
+ *  Driver for the NXP SAA7164 PCIe bridge
+ *
+ *  Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
+ *
+ *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include "saa7164.h"
+
+static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
+{
+	struct saa7164_i2c *bus = i2c_adap->algo_data;
+	struct saa7164_dev *dev = bus->dev;
+	int i, retval = 0;
+
+	dprintk(DBGLVL_I2C, "%s(num = %d)\n", __func__, num);
+
+	for (i = 0 ; i < num; i++) {
+		dprintk(DBGLVL_I2C, "%s(num = %d) addr = 0x%02x  len = 0x%x\n",
+			__func__, num, msgs[i].addr, msgs[i].len);
+		if (msgs[i].flags & I2C_M_RD) {
+			/* Unsupported - Yet*/
+			printk(KERN_ERR "%s() Unsupported - Yet\n", __func__);
+			continue;
+		} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
+			   msgs[i].addr == msgs[i + 1].addr) {
+			/* write then read from same address */
+
+			retval = saa7164_api_i2c_read(bus, msgs[i].addr,
+				msgs[i].len, msgs[i].buf,
+				msgs[i+1].len, msgs[i+1].buf
+				);
+
+			i++;
+
+			if (retval < 0)
+				goto err;
+		} else {
+			/* write */
+			retval = saa7164_api_i2c_write(bus, msgs[i].addr,
+				msgs[i].len, msgs[i].buf);
+		}
+		if (retval < 0)
+			goto err;
+	}
+	return num;
+
+err:
+	return retval;
+}
+
+static u32 saa7164_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm saa7164_i2c_algo_template = {
+	.master_xfer	= i2c_xfer,
+	.functionality	= saa7164_functionality,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static struct i2c_adapter saa7164_i2c_adap_template = {
+	.name              = "saa7164",
+	.owner             = THIS_MODULE,
+	.algo              = &saa7164_i2c_algo_template,
+};
+
+static struct i2c_client saa7164_i2c_client_template = {
+	.name	= "saa7164 internal",
+};
+
+int saa7164_i2c_register(struct saa7164_i2c *bus)
+{
+	struct saa7164_dev *dev = bus->dev;
+
+	dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr);
+
+	bus->i2c_adap = saa7164_i2c_adap_template;
+	bus->i2c_client = saa7164_i2c_client_template;
+
+	bus->i2c_adap.dev.parent = &dev->pci->dev;
+
+	strlcpy(bus->i2c_adap.name, bus->dev->name,
+		sizeof(bus->i2c_adap.name));
+
+	bus->i2c_adap.algo_data = bus;
+	i2c_set_adapdata(&bus->i2c_adap, bus);
+	i2c_add_adapter(&bus->i2c_adap);
+
+	bus->i2c_client.adapter = &bus->i2c_adap;
+
+	if (0 != bus->i2c_rc)
+		printk(KERN_ERR "%s: i2c bus %d register FAILED\n",
+			dev->name, bus->nr);
+
+	return bus->i2c_rc;
+}
+
+int saa7164_i2c_unregister(struct saa7164_i2c *bus)
+{
+	i2c_del_adapter(&bus->i2c_adap);
+	return 0;
+}
-- 
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