Date:	Tue,  9 Sep 2008 00:06:01 -0400
From:	Jarod Wilson <jwilson@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jarod Wilson <jwilson@...hat.com>, Jarod Wilson <jarod@...hat.com>,
	Janne Grunau <j@...nau.net>,
	Christoph Bartelmus <lirc@...telmus.de>
Subject: [PATCH 16/18] lirc driver for the IR interface on BT829-based hardware

Signed-off-by: Jarod Wilson <jarod@...hat.com>
Signed-off-by: Janne Grunau <j@...nau.net>
CC: Christoph Bartelmus <lirc@...telmus.de>
---
 drivers/input/lirc/Kconfig      |    7 +
 drivers/input/lirc/Makefile     |    1 +
 drivers/input/lirc/lirc_bt829.c |  388 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 396 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/lirc/lirc_bt829.c

diff --git a/drivers/input/lirc/Kconfig b/drivers/input/lirc/Kconfig
index b2bdbfb..2af6278 100644
--- a/drivers/input/lirc/Kconfig
+++ b/drivers/input/lirc/Kconfig
@@ -25,6 +25,13 @@ config LIRC_ATIUSB
 	help
 	  Driver for the ATI USB RF remote receiver
 
+config LIRC_BT829
+	tristate "BT829 based hardware"
+	default n
+	depends on LIRC_DEV
+	help
+	  Driver for the IR interface on BT829-based hardware
+
 config LIRC_CMDIR
 	tristate "CommandIR USB Transceiver"
 	default n
diff --git a/drivers/input/lirc/Makefile b/drivers/input/lirc/Makefile
index 761cb47..c5f71fa 100644
--- a/drivers/input/lirc/Makefile
+++ b/drivers/input/lirc/Makefile
@@ -7,6 +7,7 @@ EXTRA_CFLAGS =-DIRCTL_DEV_MAJOR=61 -DLIRC_SERIAL_TRANSMITTER -I$(src)
 
 obj-$(CONFIG_LIRC_DEV)		+= lirc_dev.o
 obj-$(CONFIG_LIRC_ATIUSB)	+= lirc_atiusb.o
+obj-$(CONFIG_LIRC_BT829)	+= lirc_bt829.o
 obj-$(CONFIG_LIRC_CMDIR)	+= lirc_cmdir.o
 obj-$(CONFIG_LIRC_I2C)		+= lirc_i2c.o
 obj-$(CONFIG_LIRC_IGORPLUGUSB)	+= lirc_igorplugusb.o
diff --git a/drivers/input/lirc/lirc_bt829.c b/drivers/input/lirc/lirc_bt829.c
new file mode 100644
index 0000000..01cbdfe
--- /dev/null
+++ b/drivers/input/lirc/lirc_bt829.c
@@ -0,0 +1,388 @@
+/*
+ * Remote control driver for the TV-card based on bt829
+ *
+ *  by Leonid Froenchenko <lfroen@...ileo.co.il>
+ *
+ *  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
+*/
+
+#include <linux/version.h>
+
+#include <linux/autoconf.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/threads.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+
+#include "lirc_dev.h"
+
+static int poll_main(void);
+static int atir_init_start(void);
+
+static void write_index(unsigned char index, unsigned int value);
+static unsigned int read_index(unsigned char index);
+
+static void do_i2c_start(void);
+static void do_i2c_stop(void);
+
+static void seems_wr_byte(unsigned char al);
+static unsigned char seems_rd_byte(void);
+
+static unsigned int read_index(unsigned char al);
+static void write_index(unsigned char ah, unsigned int edx);
+
+static void cycle_delay(int cycle);
+
+static void do_set_bits(unsigned char bl);
+static unsigned char do_get_bits(void);
+
+#define DATA_PCI_OFF 0x7FFC00
+#define WAIT_CYCLE   20
+
+static int debug;
+#define dprintk(fmt, args...)					\
+	do {							\
+		if (debug)					\
+			printk(KERN_DEBUG fmt, ## args);	\
+	} while (0)
+
+static int atir_minor;
+static unsigned long pci_addr_phys;
+static unsigned char *pci_addr_lin;
+
+static struct lirc_plugin atir_plugin;
+
+static struct pci_dev *do_pci_probe(void)
+{
+	struct pci_dev *my_dev;
+	my_dev = pci_get_device(PCI_VENDOR_ID_ATI,
+				PCI_DEVICE_ID_ATI_264VT, NULL);
+	if (my_dev) {
+		printk(KERN_ERR "ATIR: Using device: %s\n",
+		       pci_name(my_dev));
+		pci_addr_phys = 0;
+		if (my_dev->resource[0].flags & IORESOURCE_MEM) {
+			pci_addr_phys = my_dev->resource[0].start;
+			printk(KERN_INFO "ATIR memory at 0x%08X \n",
+			       (unsigned int)pci_addr_phys);
+		}
+		if (pci_addr_phys == 0) {
+			printk(KERN_ERR "ATIR no memory resource ?\n");
+			return NULL;
+		}
+	} else {
+		printk(KERN_ERR "ATIR: pci_prob failed\n");
+		return NULL;
+	}
+	return my_dev;
+}
+
+static int atir_add_to_buf(void *data, struct lirc_buffer *buf)
+{
+	unsigned char key;
+	int status;
+	status = poll_main();
+	key = (status >> 8) & 0xFF;
+	if (status & 0xFF) {
+		dprintk("ATIR reading key %02X\n", key);
+		lirc_buffer_write_1(buf, &key);
+		return 0;
+	}
+	return -ENODATA;
+}
+
+static int atir_set_use_inc(void *data)
+{
+	dprintk("ATIR driver is opened\n");
+	return 0;
+}
+
+static void atir_set_use_dec(void *data)
+{
+	dprintk("ATIR driver is closed\n");
+}
+
+int init_module(void)
+{
+	struct pci_dev *pdev;
+
+	pdev = do_pci_probe();
+	if (pdev == NULL)
+		return 1;
+
+	if (!atir_init_start())
+		return 1;
+
+	strcpy(atir_plugin.name, "ATIR");
+	atir_plugin.minor       = -1;
+	atir_plugin.code_length = 8;
+	atir_plugin.sample_rate = 10;
+	atir_plugin.data        = 0;
+	atir_plugin.add_to_buf  = atir_add_to_buf;
+	atir_plugin.set_use_inc = atir_set_use_inc;
+	atir_plugin.set_use_dec = atir_set_use_dec;
+	atir_plugin.dev         = &pdev->dev;
+	atir_plugin.owner       = THIS_MODULE;
+
+	atir_minor = lirc_register_plugin(&atir_plugin);
+	dprintk("ATIR driver is registered on minor %d\n", atir_minor);
+
+	return 0;
+}
+
+
+void cleanup_module(void)
+{
+	lirc_unregister_plugin(atir_minor);
+}
+
+
+static int atir_init_start(void)
+{
+	pci_addr_lin = ioremap(pci_addr_phys + DATA_PCI_OFF, 0x400);
+	if (pci_addr_lin == 0) {
+		printk(KERN_INFO "atir: pci mem must be mapped\n");
+		return 0;
+	}
+	return 1;
+}
+
+static void cycle_delay(int cycle)
+{
+	udelay(WAIT_CYCLE*cycle);
+}
+
+
+static int poll_main()
+{
+	unsigned char status_high, status_low;
+
+	do_i2c_start();
+
+	seems_wr_byte(0xAA);
+	seems_wr_byte(0x01);
+
+	do_i2c_start();
+
+	seems_wr_byte(0xAB);
+
+	status_low = seems_rd_byte();
+	status_high = seems_rd_byte();
+
+	do_i2c_stop();
+
+	return (status_high << 8) | status_low;
+}
+
+static void do_i2c_start(void)
+{
+	do_set_bits(3);
+	cycle_delay(4);
+
+	do_set_bits(1);
+	cycle_delay(7);
+
+	do_set_bits(0);
+	cycle_delay(2);
+}
+
+static void do_i2c_stop(void)
+{
+	unsigned char bits;
+	bits =  do_get_bits() & 0xFD;
+	do_set_bits(bits);
+	cycle_delay(1);
+
+	bits |= 1;
+	do_set_bits(bits);
+	cycle_delay(2);
+
+	bits |= 2;
+	do_set_bits(bits);
+	bits = 3;
+	do_set_bits(bits);
+	cycle_delay(2);
+}
+
+static void seems_wr_byte(unsigned char value)
+{
+	int i;
+	unsigned char reg;
+
+	reg = do_get_bits();
+	for (i = 0; i < 8; i++) {
+		if (value & 0x80)
+			reg |= 0x02;
+		else
+			reg &= 0xFD;
+
+		do_set_bits(reg);
+		cycle_delay(1);
+
+		reg |= 1;
+		do_set_bits(reg);
+		cycle_delay(1);
+
+		reg &= 0xFE;
+		do_set_bits(reg);
+		cycle_delay(1);
+		value <<= 1;
+	}
+	cycle_delay(2);
+
+	reg |= 2;
+	do_set_bits(reg);
+
+	reg |= 1;
+	do_set_bits(reg);
+
+	cycle_delay(1);
+	do_get_bits();
+
+	reg &= 0xFE;
+	do_set_bits(reg);
+	cycle_delay(3);
+}
+
+static unsigned char seems_rd_byte(void)
+{
+	int i;
+	int rd_byte;
+	unsigned char bits_2, bits_1;
+
+	bits_1 = do_get_bits() | 2;
+	do_set_bits(bits_1);
+
+	rd_byte = 0;
+	for (i = 0; i < 8; i++) {
+		bits_1 &= 0xFE;
+		do_set_bits(bits_1);
+		cycle_delay(2);
+
+		bits_1 |= 1;
+		do_set_bits(bits_1);
+		cycle_delay(1);
+
+		bits_2 = do_get_bits();
+		if (bits_2 & 2)
+			rd_byte |= 1;
+
+		rd_byte <<= 1;
+	}
+
+	bits_1 = 0;
+	if (bits_2 == 0)
+		bits_1 |= 2;
+
+	do_set_bits(bits_1);
+	cycle_delay(2);
+
+	bits_1 |= 1;
+	do_set_bits(bits_1);
+	cycle_delay(3);
+
+	bits_1 &= 0xFE;
+	do_set_bits(bits_1);
+	cycle_delay(2);
+
+	rd_byte >>= 1;
+	rd_byte &= 0xFF;
+	return rd_byte;
+}
+
+static void do_set_bits(unsigned char new_bits)
+{
+	int reg_val;
+	reg_val = read_index(0x34);
+	if (new_bits & 2) {
+		reg_val &= 0xFFFFFFDF;
+		reg_val |= 1;
+	} else {
+		reg_val &= 0xFFFFFFFE;
+		reg_val |= 0x20;
+	}
+	reg_val |= 0x10;
+	write_index(0x34, reg_val);
+
+	reg_val = read_index(0x31);
+	if (new_bits & 1)
+		reg_val |= 0x1000000;
+	else
+		reg_val &= 0xFEFFFFFF;
+
+	reg_val |= 0x8000000;
+	write_index(0x31, reg_val);
+}
+
+static unsigned char do_get_bits(void)
+{
+	unsigned char bits;
+	int reg_val;
+
+	reg_val = read_index(0x34);
+	reg_val |= 0x10;
+	reg_val &= 0xFFFFFFDF;
+	write_index(0x34, reg_val);
+
+	reg_val = read_index(0x34);
+	bits = 0;
+	if (reg_val & 8)
+		bits |= 2;
+	else
+		bits &= 0xFD;
+
+	reg_val = read_index(0x31);
+	if (reg_val & 0x1000000)
+		bits |= 1;
+	else
+		bits &= 0xFE;
+
+	return bits;
+}
+
+static unsigned int read_index(unsigned char index)
+{
+	unsigned char *addr;
+	unsigned int value;
+	/*  addr = pci_addr_lin + DATA_PCI_OFF + ((index & 0xFF) << 2); */
+	addr = pci_addr_lin + ((index & 0xFF) << 2);
+	value = readl(addr);
+	return value;
+}
+
+static void write_index(unsigned char index, unsigned int reg_val)
+{
+	unsigned char *addr;
+	addr = pci_addr_lin + ((index & 0xFF) << 2);
+	writel(reg_val, addr);
+}
+
+MODULE_AUTHOR("Froenchenko Leonid");
+MODULE_DESCRIPTION("IR remote driver for bt829 based TV cards");
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
-- 
1.6.0.1

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