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From: Jarod Wilson on 26 Jul 2010 19:30
Signed-off-by: Jarod Wilson <jarod(a)redhat.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(a)goldbach.in-berlin.de>
+ * modified for PixelView (BT878P+W/FM) by
+ * Michal Kochanowicz <mkochano(a)pld.org.pl>
+ * Christoph Bartelmus <lirc(a)bartelmus.de>
+ * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
+ * Ulrich Mueller <ulrich.mueller42(a)web.de>
+ * modified for Asus TV-Box and Creative/VisionTek BreakOut-Box by
+ * Stefan Jahn <stefan(a)lkcc.org>
+ * modified for inclusion into kernel sources by
+ * Jerome Brock <jbrock(a)users.sourceforge.net>
+ * modified for Leadtek Winfast PVR2000 by
+ * Thomas Reitmayr (treitmayr(a)yahoo.com)
+ * modified for Hauppauge HVR-1300 by
+ * Jan Frey (jfrey(a)gmx.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(a)redhat.com

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Prev: [PATCH 02/15] staging/lirc: add lirc_ene0100 driver
Next: [PATCH 01/15] staging/lirc: add lirc_bt829 driver