Message-ID: <20100726232837.GD21225@redhat.com>
Date:	Mon, 26 Jul 2010 19:28:37 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-media@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH 03/15] staging/lirc: add lirc_i2c driver

Signed-off-by: Jarod Wilson <jarod@...hat.com>
---
 drivers/staging/lirc/lirc_i2c.c |  536 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 536 insertions(+), 0 deletions(-)
 create mode 100644 drivers/staging/lirc/lirc_i2c.c

diff --git a/drivers/staging/lirc/lirc_i2c.c b/drivers/staging/lirc/lirc_i2c.c
new file mode 100644
index 0000000..6df2c0e
--- /dev/null
+++ b/drivers/staging/lirc/lirc_i2c.c
@@ -0,0 +1,536 @@
+/*
+ * lirc_i2c.c
+ *
+ * i2c IR driver for the onboard IR port on many TV tuner cards, including:
+ *  -Flavors of the Hauppauge PVR-150/250/350
+ *  -Hauppauge HVR-1300
+ *  -PixelView (BT878P+W/FM)
+ *  -KNC ONE TV Station/Anubis Typhoon TView Tuner
+ *  -Asus TV-Box and Creative/VisionTek BreakOut-Box
+ *  -Leadtek Winfast PVR2000
+ *
+ * Copyright (c) 2000 Gerd Knorr <kraxel@...dbach.in-berlin.de>
+ * modified for PixelView (BT878P+W/FM) by
+ *      Michal Kochanowicz <mkochano@....org.pl>
+ *      Christoph Bartelmus <lirc@...telmus.de>
+ * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
+ *      Ulrich Mueller <ulrich.mueller42@....de>
+ * modified for Asus TV-Box and Creative/VisionTek BreakOut-Box by
+ *      Stefan Jahn <stefan@...c.org>
+ * modified for inclusion into kernel sources by
+ *      Jerome Brock <jbrock@...rs.sourceforge.net>
+ * modified for Leadtek Winfast PVR2000 by
+ *      Thomas Reitmayr (treitmayr@...oo.com)
+ * modified for Hauppauge HVR-1300 by
+ *      Jan Frey (jfrey@....de)
+ *
+ * parts are cut&pasted from the old lirc_haup.c driver
+ *
+ *  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/module.h>
+#include <linux/kmod.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include <media/lirc_dev.h>
+
+struct IR {
+	struct lirc_driver l;
+	struct i2c_client  c;
+	int nextkey;
+	unsigned char b[3];
+	unsigned char bits;
+	unsigned char flag;
+};
+
+#define DEVICE_NAME "lirc_i2c"
+
+/* module parameters */
+static int debug;	/* debug output */
+static int minor = -1;	/* minor number */
+
+#define dprintk(fmt, args...)						\
+	do {								\
+		if (debug)						\
+			printk(KERN_DEBUG DEVICE_NAME ": " fmt,		\
+			       ## args);				\
+	} while (0)
+
+static int reverse(int data, int bits)
+{
+	int i;
+	int c;
+
+	for (c = 0, i = 0; i < bits; i++)
+		c |= ((data & (1<<i)) ? 1 : 0) << (bits-1-i);
+
+	return c;
+}
+
+static int add_to_buf_adap(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	unsigned char keybuf[4];
+
+	keybuf[0] = 0x00;
+	i2c_master_send(&ir->c, keybuf, 1);
+	/* poll IR chip */
+	if (i2c_master_recv(&ir->c, keybuf, sizeof(keybuf)) != sizeof(keybuf)) {
+		dprintk("read error\n");
+		return -EIO;
+	}
+
+	dprintk("key (0x%02x%02x%02x%02x)\n",
+		keybuf[0], keybuf[1], keybuf[2], keybuf[3]);
+
+	/* key pressed ? */
+	if (keybuf[2] == 0xff)
+		return -ENODATA;
+
+	/* remove repeat bit */
+	keybuf[2] &= 0x7f;
+	keybuf[3] |= 0x80;
+
+	lirc_buffer_write(buf, keybuf);
+	return 0;
+}
+
+static int add_to_buf_pcf8574(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	int rc;
+	unsigned char all, mask;
+	unsigned char key;
+
+	/* compute all valid bits (key code + pressed/release flag) */
+	all = ir->bits | ir->flag;
+
+	/* save IR writable mask bits */
+	mask = i2c_smbus_read_byte(&ir->c) & ~all;
+
+	/* send bit mask */
+	rc = i2c_smbus_write_byte(&ir->c, (0xff & all) | mask);
+
+	/* receive scan code */
+	rc = i2c_smbus_read_byte(&ir->c);
+
+	if (rc == -1) {
+		dprintk("%s read error\n", ir->c.name);
+		return -EIO;
+	}
+
+	/* drop duplicate polls */
+	if (ir->b[0] == (rc & all))
+		return -ENODATA;
+
+	ir->b[0] = rc & all;
+
+	dprintk("%s key 0x%02X %s\n", ir->c.name, rc & ir->bits,
+		(rc & ir->flag) ? "released" : "pressed");
+
+	/* ignore released buttons */
+	if (rc & ir->flag)
+		return -ENODATA;
+
+	/* set valid key code */
+	key  = rc & ir->bits;
+	lirc_buffer_write(buf, &key);
+	return 0;
+}
+
+/* common for Hauppauge IR receivers */
+static int add_to_buf_haup_common(void *data, struct lirc_buffer *buf,
+		unsigned char *keybuf, int size, int offset)
+{
+	struct IR *ir = data;
+	__u16 code;
+	unsigned char codes[2];
+	int ret;
+
+	/* poll IR chip */
+	ret = i2c_master_recv(&ir->c, keybuf, size);
+	if (ret == size) {
+		ir->b[0] = keybuf[offset];
+		ir->b[1] = keybuf[offset+1];
+		ir->b[2] = keybuf[offset+2];
+		if (ir->b[0] != 0x00 && ir->b[1] != 0x00)
+			dprintk("key (0x%02x/0x%02x)\n", ir->b[0], ir->b[1]);
+	} else {
+		dprintk("read error (ret=%d)\n", ret);
+		/* keep last successful read buffer */
+	}
+
+	/* key pressed ? */
+	if ((ir->b[0] & 0x80) == 0)
+		return -ENODATA;
+
+	/* look what we have */
+	code = (((__u16)ir->b[0]&0x7f)<<6) | (ir->b[1]>>2);
+
+	codes[0] = (code >> 8) & 0xff;
+	codes[1] = code & 0xff;
+
+	/* return it */
+	dprintk("sending code 0x%02x%02x to lirc\n", codes[0], codes[1]);
+	lirc_buffer_write(buf, codes);
+	return 0;
+}
+
+/* specific for the Hauppauge PVR150 IR receiver */
+static int add_to_buf_haup_pvr150(void *data, struct lirc_buffer *buf)
+{
+	unsigned char keybuf[6];
+	/* fetch 6 bytes, first relevant is at offset 3 */
+	return add_to_buf_haup_common(data, buf, keybuf, 6, 3);
+}
+
+/* used for all Hauppauge IR receivers but the PVR150 */
+static int add_to_buf_haup(void *data, struct lirc_buffer *buf)
+{
+	unsigned char keybuf[3];
+	/* fetch 3 bytes, first relevant is at offset 0 */
+	return add_to_buf_haup_common(data, buf, keybuf, 3, 0);
+}
+
+
+static int add_to_buf_pvr2000(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	unsigned char key;
+	s32 flags;
+	s32 code;
+
+	/* poll IR chip */
+	flags = i2c_smbus_read_byte_data(&ir->c, 0x10);
+	if (-1 == flags) {
+		dprintk("read error\n");
+		return -ENODATA;
+	}
+	/* key pressed ? */
+	if (0 == (flags & 0x80))
+		return -ENODATA;
+
+	/* read actual key code */
+	code = i2c_smbus_read_byte_data(&ir->c, 0x00);
+	if (-1 == code) {
+		dprintk("read error\n");
+		return -ENODATA;
+	}
+
+	key = code & 0xFF;
+
+	dprintk("IR Key/Flags: (0x%02x/0x%02x)\n", key, flags & 0xFF);
+
+	/* return it */
+	lirc_buffer_write(buf, &key);
+	return 0;
+}
+
+static int add_to_buf_pixelview(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	unsigned char key;
+
+	/* poll IR chip */
+	if (1 != i2c_master_recv(&ir->c, &key, 1)) {
+		dprintk("read error\n");
+		return -1;
+	}
+	dprintk("key %02x\n", key);
+
+	/* return it */
+	lirc_buffer_write(buf, &key);
+	return 0;
+}
+
+static int add_to_buf_pv951(void *data, struct lirc_buffer *buf)
+{
+	struct IR *ir = data;
+	unsigned char key;
+	unsigned char codes[4];
+
+	/* poll IR chip */
+	if (1 != i2c_master_recv(&ir->c, &key, 1)) {
+		dprintk("read error\n");
+		return -ENODATA;
+	}
+	/* ignore 0xaa */
+	if (key == 0xaa)
+		return -ENODATA;
+	dprintk("key %02x\n", key);
+
+	codes[0] = 0x61;
+	codes[1] = 0xD6;
+	codes[2] = reverse(key, 8);
+	codes[3] = (~codes[2])&0xff;
+
+	lirc_buffer_write(buf, codes);
+	return 0;
+}
+
+static int add_to_buf_knc1(void *data, struct lirc_buffer *buf)
+{
+	static unsigned char last_key = 0xFF;
+	struct IR *ir = data;
+	unsigned char key;
+
+	/* poll IR chip */
+	if (1 != i2c_master_recv(&ir->c, &key, 1)) {
+		dprintk("read error\n");
+		return -ENODATA;
+	}
+
+	/*
+	 * it seems that 0xFE indicates that a button is still held
+	 * down, while 0xFF indicates that no button is held
+	 * down. 0xFE sequences are sometimes interrupted by 0xFF
+	 */
+
+	dprintk("key %02x\n", key);
+
+	if (key == 0xFF)
+		return -ENODATA;
+
+	if (key == 0xFE)
+		key = last_key;
+
+	last_key = key;
+	lirc_buffer_write(buf, &key);
+
+	return 0;
+}
+
+static int set_use_inc(void *data)
+{
+	struct IR *ir = data;
+
+	dprintk("%s called\n", __func__);
+
+	/* lock bttv in memory while /dev/lirc is in use  */
+	i2c_use_client(&ir->c);
+
+	return 0;
+}
+
+static void set_use_dec(void *data)
+{
+	struct IR *ir = data;
+
+	dprintk("%s called\n", __func__);
+
+	i2c_release_client(&ir->c);
+}
+
+static struct lirc_driver lirc_template = {
+	.name		= "lirc_i2c",
+	.set_use_inc	= set_use_inc,
+	.set_use_dec	= set_use_dec,
+	.dev		= NULL,
+	.owner		= THIS_MODULE,
+};
+
+static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id);
+static int ir_remove(struct i2c_client *client);
+static int ir_command(struct i2c_client *client, unsigned int cmd, void *arg);
+
+static const struct i2c_device_id ir_receiver_id[] = {
+	/* Generic entry for any IR receiver */
+	{ "ir_video", 0 },
+	/* IR device specific entries could be added here */
+	{ }
+};
+
+static struct i2c_driver driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= "i2c ir driver",
+	},
+	.probe		= ir_probe,
+	.remove		= ir_remove,
+	.id_table	= ir_receiver_id,
+	.command	= ir_command,
+};
+
+static void pcf_probe(struct i2c_client *client, struct IR *ir)
+{
+	int ret1, ret2, ret3, ret4;
+
+	ret1 = i2c_smbus_write_byte(client, 0xff);
+	ret2 = i2c_smbus_read_byte(client);
+	ret3 = i2c_smbus_write_byte(client, 0x00);
+	ret4 = i2c_smbus_read_byte(client);
+
+	/* in the Asus TV-Box: bit 1-0 */
+	if (((ret2 & 0x03) == 0x03) && ((ret4 & 0x03) == 0x00)) {
+		ir->bits = (unsigned char) ~0x07;
+		ir->flag = 0x04;
+	/* in the Creative/VisionTek BreakOut-Box: bit 7-6 */
+	} else if (((ret2 & 0xc0) == 0xc0) && ((ret4 & 0xc0) == 0x00)) {
+		ir->bits = (unsigned char) ~0xe0;
+		ir->flag = 0x20;
+	}
+
+	return;
+}
+
+static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	struct IR *ir;
+	struct i2c_adapter *adap = client->adapter;
+	unsigned short addr = client->addr;
+	int retval;
+
+	ir = kzalloc(sizeof(struct IR), GFP_KERNEL);
+	if (!ir)
+		return -ENOMEM;
+	memcpy(&ir->l, &lirc_template, sizeof(struct lirc_driver));
+	memcpy(&ir->c, client, sizeof(struct i2c_client));
+
+	i2c_set_clientdata(client, ir);
+	ir->l.data    = ir;
+	ir->l.minor   = minor;
+	ir->l.sample_rate = 10;
+	ir->l.dev     = &ir->c.dev;
+	ir->nextkey   = -1;
+
+	switch (addr) {
+	case 0x64:
+		strlcpy(ir->c.name, "Pixelview IR", I2C_NAME_SIZE);
+		ir->l.code_length = 8;
+		ir->l.add_to_buf = add_to_buf_pixelview;
+		break;
+	case 0x4b:
+		strlcpy(ir->c.name, "PV951 IR", I2C_NAME_SIZE);
+		ir->l.code_length = 32;
+		ir->l.add_to_buf = add_to_buf_pv951;
+		break;
+	case 0x71:
+		if (adap->id == I2C_HW_B_CX2388x)
+			strlcpy(ir->c.name, "Hauppauge HVR1300", I2C_NAME_SIZE);
+		else /* bt8xx or cx2341x */
+			/*
+			 * The PVR150 IR receiver uses the same protocol as
+			 * other Hauppauge cards, but the data flow is
+			 * different, so we need to deal with it by its own.
+			 */
+			strlcpy(ir->c.name, "Hauppauge PVR150", I2C_NAME_SIZE);
+		ir->l.code_length = 13;
+		ir->l.add_to_buf = add_to_buf_haup_pvr150;
+		break;
+	case 0x6b:
+		strlcpy(ir->c.name, "Adaptec IR", I2C_NAME_SIZE);
+		ir->l.code_length = 32;
+		ir->l.add_to_buf = add_to_buf_adap;
+		break;
+	case 0x18:
+	case 0x1a:
+		if (adap->id == I2C_HW_B_CX2388x) {
+			strlcpy(ir->c.name, "Leadtek IR", I2C_NAME_SIZE);
+			ir->l.code_length = 8;
+			ir->l.add_to_buf = add_to_buf_pvr2000;
+		} else { /* bt8xx or cx2341x */
+			strlcpy(ir->c.name, "Hauppauge IR", I2C_NAME_SIZE);
+			ir->l.code_length = 13;
+			ir->l.add_to_buf = add_to_buf_haup;
+		}
+		break;
+	case 0x30:
+		strlcpy(ir->c.name, "KNC ONE IR", I2C_NAME_SIZE);
+		ir->l.code_length = 8;
+		ir->l.add_to_buf = add_to_buf_knc1;
+		break;
+	case 0x21:
+	case 0x23:
+		pcf_probe(client, ir);
+		strlcpy(ir->c.name, "TV-Box IR", I2C_NAME_SIZE);
+		ir->l.code_length = 8;
+		ir->l.add_to_buf = add_to_buf_pcf8574;
+		break;
+	default:
+		/* shouldn't happen */
+		printk("lirc_i2c: Huh? unknown i2c address (0x%02x)?\n", addr);
+		kfree(ir);
+		return -EINVAL;
+	}
+	printk(KERN_INFO "lirc_i2c: chip 0x%x found @ 0x%02x (%s)\n",
+	       adap->id, addr, ir->c.name);
+
+	retval = lirc_register_driver(&ir->l);
+
+	if (retval < 0) {
+		printk(KERN_ERR "lirc_i2c: failed to register driver!\n");
+		kfree(ir);
+		return retval;
+	}
+
+	ir->l.minor = retval;
+
+	return 0;
+}
+
+static int ir_remove(struct i2c_client *client)
+{
+	struct IR *ir = i2c_get_clientdata(client);
+
+	/* unregister device */
+	lirc_unregister_driver(ir->l.minor);
+
+	/* free memory */
+	kfree(ir);
+	return 0;
+}
+
+static int ir_command(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+	/* nothing */
+	return 0;
+}
+
+static int __init lirc_i2c_init(void)
+{
+	i2c_add_driver(&driver);
+	return 0;
+}
+
+static void __exit lirc_i2c_exit(void)
+{
+	i2c_del_driver(&driver);
+}
+
+MODULE_DESCRIPTION("Infrared receiver driver for Hauppauge and "
+		   "Pixelview cards (i2c stack)");
+MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, "
+	      "Ulrich Mueller, Stefan Jahn, Jerome Brock");
+MODULE_LICENSE("GPL");
+
+module_param(minor, int, S_IRUGO);
+MODULE_PARM_DESC(minor, "Preferred minor device number");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
+
+module_init(lirc_i2c_init);
+module_exit(lirc_i2c_exit);
-- 
1.7.1.1

-- 
Jarod Wilson
jarod@...hat.com

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