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Message-ID: <20100726233404.GO21225@redhat.com>
Date: Mon, 26 Jul 2010 19:34:04 -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 14/15] staging/lirc: add lirc_zilog driver
Commonly found on several Hauppauge video capture devices.
Signed-off-by: Jarod Wilson <jarod@...hat.com>
---
drivers/staging/lirc/lirc_zilog.c | 1387 +++++++++++++++++++++++++++++++++++++
1 files changed, 1387 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/lirc/lirc_zilog.c
diff --git a/drivers/staging/lirc/lirc_zilog.c b/drivers/staging/lirc/lirc_zilog.c
new file mode 100644
index 0000000..1b013bf
--- /dev/null
+++ b/drivers/staging/lirc/lirc_zilog.c
@@ -0,0 +1,1387 @@
+/*
+ * i2c IR lirc driver for devices with zilog IR processors
+ *
+ * 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 PVR-150 IR TX device by
+ * Mark Weaver <mark@...l.co.uk>
+ * changed name from lirc_pvr150 to lirc_zilog, works on more than pvr-150
+ * Jarod Wilson <jarod@...hat.com>
+ *
+ * parts are cut&pasted from the lirc_i2c.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/fs.h>
+#include <linux/poll.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/completion.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/firmware.h>
+#include <linux/vmalloc.h>
+
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+
+#include <media/lirc_dev.h>
+#include <media/lirc.h>
+
+struct IR {
+ struct lirc_driver l;
+
+ /* Device info */
+ struct mutex ir_lock;
+ int open;
+
+ /* RX device */
+ struct i2c_client c_rx;
+ int have_rx;
+
+ /* RX device buffer & lock */
+ struct lirc_buffer buf;
+ struct mutex buf_lock;
+
+ /* RX polling thread data */
+ struct completion *t_notify;
+ struct completion *t_notify2;
+ int shutdown;
+ struct task_struct *task;
+
+ /* RX read data */
+ unsigned char b[3];
+
+ /* TX device */
+ struct i2c_client c_tx;
+ int need_boot;
+ int have_tx;
+};
+
+/* Minor -> data mapping */
+static struct IR *ir_devices[MAX_IRCTL_DEVICES];
+
+/* Block size for IR transmitter */
+#define TX_BLOCK_SIZE 99
+
+/* Hauppauge IR transmitter data */
+struct tx_data_struct {
+ /* Boot block */
+ unsigned char *boot_data;
+
+ /* Start of binary data block */
+ unsigned char *datap;
+
+ /* End of binary data block */
+ unsigned char *endp;
+
+ /* Number of installed codesets */
+ unsigned int num_code_sets;
+
+ /* Pointers to codesets */
+ unsigned char **code_sets;
+
+ /* Global fixed data template */
+ int fixed[TX_BLOCK_SIZE];
+};
+
+static struct tx_data_struct *tx_data;
+static struct mutex tx_data_lock;
+
+#define zilog_notify(s, args...) printk(KERN_NOTICE KBUILD_MODNAME ": " s, \
+ ## args)
+#define zilog_error(s, args...) printk(KERN_ERR KBUILD_MODNAME ": " s, ## args)
+
+#define ZILOG_HAUPPAUGE_IR_RX_NAME "Zilog/Hauppauge IR RX"
+#define ZILOG_HAUPPAUGE_IR_TX_NAME "Zilog/Hauppauge IR TX"
+
+/* module parameters */
+static int debug; /* debug output */
+static int disable_rx; /* disable RX device */
+static int disable_tx; /* disable TX device */
+static int minor = -1; /* minor number */
+
+#define dprintk(fmt, args...) \
+ do { \
+ if (debug) \
+ printk(KERN_DEBUG KBUILD_MODNAME ": " fmt, \
+ ## args); \
+ } while (0)
+
+static int add_to_buf(struct IR *ir)
+{
+ __u16 code;
+ unsigned char codes[2];
+ unsigned char keybuf[6];
+ int got_data = 0;
+ int ret;
+ int failures = 0;
+ unsigned char sendbuf[1] = { 0 };
+
+ if (lirc_buffer_full(&ir->buf)) {
+ dprintk("buffer overflow\n");
+ return -EOVERFLOW;
+ }
+
+ /*
+ * service the device as long as it is returning
+ * data and we have space
+ */
+ do {
+ /*
+ * Lock i2c bus for the duration. RX/TX chips interfere so
+ * this is worth it
+ */
+ mutex_lock(&ir->ir_lock);
+
+ /*
+ * Send random "poll command" (?) Windows driver does this
+ * and it is a good point to detect chip failure.
+ */
+ ret = i2c_master_send(&ir->c_rx, sendbuf, 1);
+ if (ret != 1) {
+ zilog_error("i2c_master_send failed with %d\n", ret);
+ if (failures >= 3) {
+ mutex_unlock(&ir->ir_lock);
+ zilog_error("unable to read from the IR chip "
+ "after 3 resets, giving up\n");
+ return ret;
+ }
+
+ /* Looks like the chip crashed, reset it */
+ zilog_error("polling the IR receiver chip failed, "
+ "trying reset\n");
+
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout((100 * HZ + 999) / 1000);
+ ir->need_boot = 1;
+
+ ++failures;
+ mutex_unlock(&ir->ir_lock);
+ continue;
+ }
+
+ ret = i2c_master_recv(&ir->c_rx, keybuf, sizeof(keybuf));
+ mutex_unlock(&ir->ir_lock);
+ if (ret != sizeof(keybuf)) {
+ zilog_error("i2c_master_recv failed with %d -- "
+ "keeping last read buffer\n", ret);
+ } else {
+ ir->b[0] = keybuf[3];
+ ir->b[1] = keybuf[4];
+ ir->b[2] = keybuf[5];
+ dprintk("key (0x%02x/0x%02x)\n", ir->b[0], ir->b[1]);
+ }
+
+ /* key pressed ? */
+#ifdef I2C_HW_B_HDPVR
+ if (ir->c_rx.adapter->id == I2C_HW_B_HDPVR) {
+ if (got_data && (keybuf[0] == 0x80))
+ return 0;
+ else if (got_data && (keybuf[0] == 0x00))
+ return -ENODATA;
+ } else if ((ir->b[0] & 0x80) == 0)
+#else
+ if ((ir->b[0] & 0x80) == 0)
+#endif
+ return got_data ? 0 : -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 */
+ lirc_buffer_write(&ir->buf, codes);
+ ++got_data;
+ } while (!lirc_buffer_full(&ir->buf));
+
+ return 0;
+}
+
+/*
+ * Main function of the polling thread -- from lirc_dev.
+ * We don't fit the LIRC model at all anymore. This is horrible, but
+ * basically we have a single RX/TX device with a nasty failure mode
+ * that needs to be accounted for across the pair. lirc lets us provide
+ * fops, but prevents us from using the internal polling, etc. if we do
+ * so. Hence the replication. Might be neater to extend the LIRC model
+ * to account for this but I'd think it's a very special case of seriously
+ * messed up hardware.
+ */
+static int lirc_thread(void *arg)
+{
+ struct IR *ir = arg;
+
+ if (ir->t_notify != NULL)
+ complete(ir->t_notify);
+
+ dprintk("poll thread started\n");
+
+ do {
+ if (ir->open) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ /*
+ * This is ~113*2 + 24 + jitter (2*repeat gap +
+ * code length). We use this interval as the chip
+ * resets every time you poll it (bad!). This is
+ * therefore just sufficient to catch all of the
+ * button presses. It makes the remote much more
+ * responsive. You can see the difference by
+ * running irw and holding down a button. With
+ * 100ms, the old polling interval, you'll notice
+ * breaks in the repeat sequence corresponding to
+ * lost keypresses.
+ */
+ schedule_timeout((260 * HZ) / 1000);
+ if (ir->shutdown)
+ break;
+ if (!add_to_buf(ir))
+ wake_up_interruptible(&ir->buf.wait_poll);
+ } else {
+ /* if device not opened so we can sleep half a second */
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(HZ/2);
+ }
+ } while (!ir->shutdown);
+
+ if (ir->t_notify2 != NULL)
+ wait_for_completion(ir->t_notify2);
+
+ ir->task = NULL;
+ if (ir->t_notify != NULL)
+ complete(ir->t_notify);
+
+ dprintk("poll thread ended\n");
+ return 0;
+}
+
+static int set_use_inc(void *data)
+{
+ struct IR *ir = data;
+
+ if (ir->l.owner == NULL || try_module_get(ir->l.owner) == 0)
+ return -ENODEV;
+
+ /* lock bttv in memory while /dev/lirc is in use */
+ /*
+ * this is completely broken code. lirc_unregister_driver()
+ * must be possible even when the device is open
+ */
+ if (ir->c_rx.addr)
+ i2c_use_client(&ir->c_rx);
+ if (ir->c_tx.addr)
+ i2c_use_client(&ir->c_tx);
+
+ return 0;
+}
+
+static void set_use_dec(void *data)
+{
+ struct IR *ir = data;
+
+ if (ir->c_rx.addr)
+ i2c_release_client(&ir->c_rx);
+ if (ir->c_tx.addr)
+ i2c_release_client(&ir->c_tx);
+ if (ir->l.owner != NULL)
+ module_put(ir->l.owner);
+}
+
+/* safe read of a uint32 (always network byte order) */
+static int read_uint32(unsigned char **data,
+ unsigned char *endp, unsigned int *val)
+{
+ if (*data + 4 > endp)
+ return 0;
+ *val = ((*data)[0] << 24) | ((*data)[1] << 16) |
+ ((*data)[2] << 8) | (*data)[3];
+ *data += 4;
+ return 1;
+}
+
+/* safe read of a uint8 */
+static int read_uint8(unsigned char **data,
+ unsigned char *endp, unsigned char *val)
+{
+ if (*data + 1 > endp)
+ return 0;
+ *val = *((*data)++);
+ return 1;
+}
+
+/* safe skipping of N bytes */
+static int skip(unsigned char **data,
+ unsigned char *endp, unsigned int distance)
+{
+ if (*data + distance > endp)
+ return 0;
+ *data += distance;
+ return 1;
+}
+
+/* decompress key data into the given buffer */
+static int get_key_data(unsigned char *buf,
+ unsigned int codeset, unsigned int key)
+{
+ unsigned char *data, *endp, *diffs, *key_block;
+ unsigned char keys, ndiffs, id;
+ unsigned int base, lim, pos, i;
+
+ /* Binary search for the codeset */
+ for (base = 0, lim = tx_data->num_code_sets; lim; lim >>= 1) {
+ pos = base + (lim >> 1);
+ data = tx_data->code_sets[pos];
+
+ if (!read_uint32(&data, tx_data->endp, &i))
+ goto corrupt;
+
+ if (i == codeset)
+ break;
+ else if (codeset > i) {
+ base = pos + 1;
+ --lim;
+ }
+ }
+ /* Not found? */
+ if (!lim)
+ return -EPROTO;
+
+ /* Set end of data block */
+ endp = pos < tx_data->num_code_sets - 1 ?
+ tx_data->code_sets[pos + 1] : tx_data->endp;
+
+ /* Read the block header */
+ if (!read_uint8(&data, endp, &keys) ||
+ !read_uint8(&data, endp, &ndiffs) ||
+ ndiffs > TX_BLOCK_SIZE || keys == 0)
+ goto corrupt;
+
+ /* Save diffs & skip */
+ diffs = data;
+ if (!skip(&data, endp, ndiffs))
+ goto corrupt;
+
+ /* Read the id of the first key */
+ if (!read_uint8(&data, endp, &id))
+ goto corrupt;
+
+ /* Unpack the first key's data */
+ for (i = 0; i < TX_BLOCK_SIZE; ++i) {
+ if (tx_data->fixed[i] == -1) {
+ if (!read_uint8(&data, endp, &buf[i]))
+ goto corrupt;
+ } else {
+ buf[i] = (unsigned char)tx_data->fixed[i];
+ }
+ }
+
+ /* Early out key found/not found */
+ if (key == id)
+ return 0;
+ if (keys == 1)
+ return -EPROTO;
+
+ /* Sanity check */
+ key_block = data;
+ if (!skip(&data, endp, (keys - 1) * (ndiffs + 1)))
+ goto corrupt;
+
+ /* Binary search for the key */
+ for (base = 0, lim = keys - 1; lim; lim >>= 1) {
+ /* Seek to block */
+ unsigned char *key_data;
+ pos = base + (lim >> 1);
+ key_data = key_block + (ndiffs + 1) * pos;
+
+ if (*key_data == key) {
+ /* skip key id */
+ ++key_data;
+
+ /* found, so unpack the diffs */
+ for (i = 0; i < ndiffs; ++i) {
+ unsigned char val;
+ if (!read_uint8(&key_data, endp, &val) ||
+ diffs[i] >= TX_BLOCK_SIZE)
+ goto corrupt;
+ buf[diffs[i]] = val;
+ }
+
+ return 0;
+ } else if (key > *key_data) {
+ base = pos + 1;
+ --lim;
+ }
+ }
+ /* Key not found */
+ return -EPROTO;
+
+corrupt:
+ zilog_error("firmware is corrupt\n");
+ return -EFAULT;
+}
+
+/* send a block of data to the IR TX device */
+static int send_data_block(struct IR *ir, unsigned char *data_block)
+{
+ int i, j, ret;
+ unsigned char buf[5];
+
+ for (i = 0; i < TX_BLOCK_SIZE;) {
+ int tosend = TX_BLOCK_SIZE - i;
+ if (tosend > 4)
+ tosend = 4;
+ buf[0] = (unsigned char)(i + 1);
+ for (j = 0; j < tosend; ++j)
+ buf[1 + j] = data_block[i + j];
+ dprintk("%02x %02x %02x %02x %02x",
+ buf[0], buf[1], buf[2], buf[3], buf[4]);
+ ret = i2c_master_send(&ir->c_tx, buf, tosend + 1);
+ if (ret != tosend + 1) {
+ zilog_error("i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EFAULT;
+ }
+ i += tosend;
+ }
+ return 0;
+}
+
+/* send boot data to the IR TX device */
+static int send_boot_data(struct IR *ir)
+{
+ int ret;
+ unsigned char buf[4];
+
+ /* send the boot block */
+ ret = send_data_block(ir, tx_data->boot_data);
+ if (ret != 0)
+ return ret;
+
+ /* kick it off? */
+ buf[0] = 0x00;
+ buf[1] = 0x20;
+ ret = i2c_master_send(&ir->c_tx, buf, 2);
+ if (ret != 2) {
+ zilog_error("i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EFAULT;
+ }
+ ret = i2c_master_send(&ir->c_tx, buf, 1);
+ if (ret != 1) {
+ zilog_error("i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EFAULT;
+ }
+
+ /* Here comes the firmware version... (hopefully) */
+ ret = i2c_master_recv(&ir->c_tx, buf, 4);
+ if (ret != 4) {
+ zilog_error("i2c_master_recv failed with %d\n", ret);
+ return 0;
+ }
+ if (buf[0] != 0x80) {
+ zilog_error("unexpected IR TX response: %02x\n", buf[0]);
+ return 0;
+ }
+ zilog_notify("Zilog/Hauppauge IR blaster firmware version "
+ "%d.%d.%d loaded\n", buf[1], buf[2], buf[3]);
+
+ return 0;
+}
+
+/* unload "firmware", lock held */
+static void fw_unload_locked(void)
+{
+ if (tx_data) {
+ if (tx_data->code_sets)
+ vfree(tx_data->code_sets);
+
+ if (tx_data->datap)
+ vfree(tx_data->datap);
+
+ vfree(tx_data);
+ tx_data = NULL;
+ dprintk("successfully unloaded IR blaster firmware\n");
+ }
+}
+
+/* unload "firmware" for the IR TX device */
+static void fw_unload(void)
+{
+ mutex_lock(&tx_data_lock);
+ fw_unload_locked();
+ mutex_unlock(&tx_data_lock);
+}
+
+/* load "firmware" for the IR TX device */
+static int fw_load(struct IR *ir)
+{
+ int ret;
+ unsigned int i;
+ unsigned char *data, version, num_global_fixed;
+ const struct firmware *fw_entry;
+
+ /* Already loaded? */
+ mutex_lock(&tx_data_lock);
+ if (tx_data) {
+ ret = 0;
+ goto out;
+ }
+
+ /* Request codeset data file */
+ ret = request_firmware(&fw_entry, "haup-ir-blaster.bin", &ir->c_tx.dev);
+ if (ret != 0) {
+ zilog_error("firmware haup-ir-blaster.bin not available "
+ "(%d)\n", ret);
+ ret = ret < 0 ? ret : -EFAULT;
+ goto out;
+ }
+ dprintk("firmware of size %zu loaded\n", fw_entry->size);
+
+ /* Parse the file */
+ tx_data = vmalloc(sizeof(*tx_data));
+ if (tx_data == NULL) {
+ zilog_error("out of memory\n");
+ release_firmware(fw_entry);
+ ret = -ENOMEM;
+ goto out;
+ }
+ tx_data->code_sets = NULL;
+
+ /* Copy the data so hotplug doesn't get confused and timeout */
+ tx_data->datap = vmalloc(fw_entry->size);
+ if (tx_data->datap == NULL) {
+ zilog_error("out of memory\n");
+ release_firmware(fw_entry);
+ vfree(tx_data);
+ ret = -ENOMEM;
+ goto out;
+ }
+ memcpy(tx_data->datap, fw_entry->data, fw_entry->size);
+ tx_data->endp = tx_data->datap + fw_entry->size;
+ release_firmware(fw_entry); fw_entry = NULL;
+
+ /* Check version */
+ data = tx_data->datap;
+ if (!read_uint8(&data, tx_data->endp, &version))
+ goto corrupt;
+ if (version != 1) {
+ zilog_error("unsupported code set file version (%u, expected"
+ "1) -- please upgrade to a newer driver",
+ version);
+ fw_unload_locked();
+ ret = -EFAULT;
+ goto out;
+ }
+
+ /* Save boot block for later */
+ tx_data->boot_data = data;
+ if (!skip(&data, tx_data->endp, TX_BLOCK_SIZE))
+ goto corrupt;
+
+ if (!read_uint32(&data, tx_data->endp,
+ &tx_data->num_code_sets))
+ goto corrupt;
+
+ dprintk("%u IR blaster codesets loaded\n", tx_data->num_code_sets);
+
+ tx_data->code_sets = vmalloc(
+ tx_data->num_code_sets * sizeof(char *));
+ if (tx_data->code_sets == NULL) {
+ fw_unload_locked();
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ for (i = 0; i < TX_BLOCK_SIZE; ++i)
+ tx_data->fixed[i] = -1;
+
+ /* Read global fixed data template */
+ if (!read_uint8(&data, tx_data->endp, &num_global_fixed) ||
+ num_global_fixed > TX_BLOCK_SIZE)
+ goto corrupt;
+ for (i = 0; i < num_global_fixed; ++i) {
+ unsigned char pos, val;
+ if (!read_uint8(&data, tx_data->endp, &pos) ||
+ !read_uint8(&data, tx_data->endp, &val) ||
+ pos >= TX_BLOCK_SIZE)
+ goto corrupt;
+ tx_data->fixed[pos] = (int)val;
+ }
+
+ /* Filch out the position of each code set */
+ for (i = 0; i < tx_data->num_code_sets; ++i) {
+ unsigned int id;
+ unsigned char keys;
+ unsigned char ndiffs;
+
+ /* Save the codeset position */
+ tx_data->code_sets[i] = data;
+
+ /* Read header */
+ if (!read_uint32(&data, tx_data->endp, &id) ||
+ !read_uint8(&data, tx_data->endp, &keys) ||
+ !read_uint8(&data, tx_data->endp, &ndiffs) ||
+ ndiffs > TX_BLOCK_SIZE || keys == 0)
+ goto corrupt;
+
+ /* skip diff positions */
+ if (!skip(&data, tx_data->endp, ndiffs))
+ goto corrupt;
+
+ /*
+ * After the diffs we have the first key id + data -
+ * global fixed
+ */
+ if (!skip(&data, tx_data->endp,
+ 1 + TX_BLOCK_SIZE - num_global_fixed))
+ goto corrupt;
+
+ /* Then we have keys-1 blocks of key id+diffs */
+ if (!skip(&data, tx_data->endp,
+ (ndiffs + 1) * (keys - 1)))
+ goto corrupt;
+ }
+ ret = 0;
+ goto out;
+
+corrupt:
+ zilog_error("firmware is corrupt\n");
+ fw_unload_locked();
+ ret = -EFAULT;
+
+out:
+ mutex_unlock(&tx_data_lock);
+ return ret;
+}
+
+/* initialise the IR TX device */
+static int tx_init(struct IR *ir)
+{
+ int ret;
+
+ /* Load 'firmware' */
+ ret = fw_load(ir);
+ if (ret != 0)
+ return ret;
+
+ /* Send boot block */
+ ret = send_boot_data(ir);
+ if (ret != 0)
+ return ret;
+ ir->need_boot = 0;
+
+ /* Looks good */
+ return 0;
+}
+
+/* do nothing stub to make LIRC happy */
+static loff_t lseek(struct file *filep, loff_t offset, int orig)
+{
+ return -ESPIPE;
+}
+
+/* copied from lirc_dev */
+static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos)
+{
+ struct IR *ir = (struct IR *)filep->private_data;
+ unsigned char buf[ir->buf.chunk_size];
+ int ret = 0, written = 0;
+ DECLARE_WAITQUEUE(wait, current);
+
+ dprintk("read called\n");
+ if (ir->c_rx.addr == 0)
+ return -ENODEV;
+
+ if (mutex_lock_interruptible(&ir->buf_lock))
+ return -ERESTARTSYS;
+
+ if (n % ir->buf.chunk_size) {
+ dprintk("read result = -EINVAL\n");
+ mutex_unlock(&ir->buf_lock);
+ return -EINVAL;
+ }
+
+ /*
+ * we add ourselves to the task queue before buffer check
+ * to avoid losing scan code (in case when queue is awaken somewhere
+ * between while condition checking and scheduling)
+ */
+ add_wait_queue(&ir->buf.wait_poll, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ /*
+ * while we didn't provide 'length' bytes, device is opened in blocking
+ * mode and 'copy_to_user' is happy, wait for data.
+ */
+ while (written < n && ret == 0) {
+ if (lirc_buffer_empty(&ir->buf)) {
+ /*
+ * According to the read(2) man page, 'written' can be
+ * returned as less than 'n', instead of blocking
+ * again, returning -EWOULDBLOCK, or returning
+ * -ERESTARTSYS
+ */
+ if (written)
+ break;
+ if (filep->f_flags & O_NONBLOCK) {
+ ret = -EWOULDBLOCK;
+ break;
+ }
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
+ }
+ schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
+ } else {
+ lirc_buffer_read(&ir->buf, buf);
+ ret = copy_to_user((void *)outbuf+written, buf,
+ ir->buf.chunk_size);
+ written += ir->buf.chunk_size;
+ }
+ }
+
+ remove_wait_queue(&ir->buf.wait_poll, &wait);
+ set_current_state(TASK_RUNNING);
+ mutex_unlock(&ir->buf_lock);
+
+ dprintk("read result = %s (%d)\n",
+ ret ? "-EFAULT" : "OK", ret);
+
+ return ret ? ret : written;
+}
+
+/* send a keypress to the IR TX device */
+static int send_code(struct IR *ir, unsigned int code, unsigned int key)
+{
+ unsigned char data_block[TX_BLOCK_SIZE];
+ unsigned char buf[2];
+ int i, ret;
+
+ /* Get data for the codeset/key */
+ ret = get_key_data(data_block, code, key);
+
+ if (ret == -EPROTO) {
+ zilog_error("failed to get data for code %u, key %u -- check "
+ "lircd.conf entries\n", code, key);
+ return ret;
+ } else if (ret != 0)
+ return ret;
+
+ /* Send the data block */
+ ret = send_data_block(ir, data_block);
+ if (ret != 0)
+ return ret;
+
+ /* Send data block length? */
+ buf[0] = 0x00;
+ buf[1] = 0x40;
+ ret = i2c_master_send(&ir->c_tx, buf, 2);
+ if (ret != 2) {
+ zilog_error("i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EFAULT;
+ }
+ ret = i2c_master_send(&ir->c_tx, buf, 1);
+ if (ret != 1) {
+ zilog_error("i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EFAULT;
+ }
+
+ /* Send finished download? */
+ ret = i2c_master_recv(&ir->c_tx, buf, 1);
+ if (ret != 1) {
+ zilog_error("i2c_master_recv failed with %d\n", ret);
+ return ret < 0 ? ret : -EFAULT;
+ }
+ if (buf[0] != 0xA0) {
+ zilog_error("unexpected IR TX response #1: %02x\n",
+ buf[0]);
+ return -EFAULT;
+ }
+
+ /* Send prepare command? */
+ buf[0] = 0x00;
+ buf[1] = 0x80;
+ ret = i2c_master_send(&ir->c_tx, buf, 2);
+ if (ret != 2) {
+ zilog_error("i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EFAULT;
+ }
+
+#ifdef I2C_HW_B_HDPVR
+ /*
+ * The sleep bits aren't necessary on the HD PVR, and in fact, the
+ * last i2c_master_recv always fails with a -5, so for now, we're
+ * going to skip this whole mess and say we're done on the HD PVR
+ */
+ if (ir->c_rx.adapter->id == I2C_HW_B_HDPVR)
+ goto done;
+#endif
+
+ /*
+ * This bit NAKs until the device is ready, so we retry it
+ * sleeping a bit each time. This seems to be what the windows
+ * driver does, approximately.
+ * Try for up to 1s.
+ */
+ for (i = 0; i < 20; ++i) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout((50 * HZ + 999) / 1000);
+ ret = i2c_master_send(&ir->c_tx, buf, 1);
+ if (ret == 1)
+ break;
+ dprintk("NAK expected: i2c_master_send "
+ "failed with %d (try %d)\n", ret, i+1);
+ }
+ if (ret != 1) {
+ zilog_error("IR TX chip never got ready: last i2c_master_send "
+ "failed with %d\n", ret);
+ return ret < 0 ? ret : -EFAULT;
+ }
+
+ /* Seems to be an 'ok' response */
+ i = i2c_master_recv(&ir->c_tx, buf, 1);
+ if (i != 1) {
+ zilog_error("i2c_master_recv failed with %d\n", ret);
+ return -EFAULT;
+ }
+ if (buf[0] != 0x80) {
+ zilog_error("unexpected IR TX response #2: %02x\n", buf[0]);
+ return -EFAULT;
+ }
+
+done:
+ /* Oh good, it worked */
+ dprintk("sent code %u, key %u\n", code, key);
+ return 0;
+}
+
+/*
+ * Write a code to the device. We take in a 32-bit number (an int) and then
+ * decode this to a codeset/key index. The key data is then decompressed and
+ * sent to the device. We have a spin lock as per i2c documentation to prevent
+ * multiple concurrent sends which would probably cause the device to explode.
+ */
+static ssize_t write(struct file *filep, const char *buf, size_t n,
+ loff_t *ppos)
+{
+ struct IR *ir = (struct IR *)filep->private_data;
+ size_t i;
+ int failures = 0;
+
+ if (ir->c_tx.addr == 0)
+ return -ENODEV;
+
+ /* Validate user parameters */
+ if (n % sizeof(int))
+ return -EINVAL;
+
+ /* Lock i2c bus for the duration */
+ mutex_lock(&ir->ir_lock);
+
+ /* Send each keypress */
+ for (i = 0; i < n;) {
+ int ret = 0;
+ int command;
+
+ if (copy_from_user(&command, buf + i, sizeof(command))) {
+ mutex_unlock(&ir->ir_lock);
+ return -EFAULT;
+ }
+
+ /* Send boot data first if required */
+ if (ir->need_boot == 1) {
+ ret = send_boot_data(ir);
+ if (ret == 0)
+ ir->need_boot = 0;
+ }
+
+ /* Send the code */
+ if (ret == 0) {
+ ret = send_code(ir, (unsigned)command >> 16,
+ (unsigned)command & 0xFFFF);
+ if (ret == -EPROTO) {
+ mutex_unlock(&ir->ir_lock);
+ return ret;
+ }
+ }
+
+ /*
+ * Hmm, a failure. If we've had a few then give up, otherwise
+ * try a reset
+ */
+ if (ret != 0) {
+ /* Looks like the chip crashed, reset it */
+ zilog_error("sending to the IR transmitter chip "
+ "failed, trying reset\n");
+
+ if (failures >= 3) {
+ zilog_error("unable to send to the IR chip "
+ "after 3 resets, giving up\n");
+ mutex_unlock(&ir->ir_lock);
+ return ret;
+ }
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout((100 * HZ + 999) / 1000);
+ ir->need_boot = 1;
+ ++failures;
+ } else
+ i += sizeof(int);
+ }
+
+ /* Release i2c bus */
+ mutex_unlock(&ir->ir_lock);
+
+ /* All looks good */
+ return n;
+}
+
+/* copied from lirc_dev */
+static unsigned int poll(struct file *filep, poll_table *wait)
+{
+ struct IR *ir = (struct IR *)filep->private_data;
+ unsigned int ret;
+
+ dprintk("poll called\n");
+ if (ir->c_rx.addr == 0)
+ return -ENODEV;
+
+ mutex_lock(&ir->buf_lock);
+
+ poll_wait(filep, &ir->buf.wait_poll, wait);
+
+ dprintk("poll result = %s\n",
+ lirc_buffer_empty(&ir->buf) ? "0" : "POLLIN|POLLRDNORM");
+
+ ret = lirc_buffer_empty(&ir->buf) ? 0 : (POLLIN|POLLRDNORM);
+
+ mutex_unlock(&ir->buf_lock);
+ return ret;
+}
+
+static long ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
+{
+ struct IR *ir = (struct IR *)filep->private_data;
+ int result;
+ unsigned long mode, features = 0;
+
+ if (ir->c_rx.addr != 0)
+ features |= LIRC_CAN_REC_LIRCCODE;
+ if (ir->c_tx.addr != 0)
+ features |= LIRC_CAN_SEND_PULSE;
+
+ switch (cmd) {
+ case LIRC_GET_LENGTH:
+ result = put_user((unsigned long)13,
+ (unsigned long *)arg);
+ break;
+ case LIRC_GET_FEATURES:
+ result = put_user(features, (unsigned long *) arg);
+ break;
+ case LIRC_GET_REC_MODE:
+ if (!(features&LIRC_CAN_REC_MASK))
+ return -ENOSYS;
+
+ result = put_user(LIRC_REC2MODE
+ (features&LIRC_CAN_REC_MASK),
+ (unsigned long *)arg);
+ break;
+ case LIRC_SET_REC_MODE:
+ if (!(features&LIRC_CAN_REC_MASK))
+ return -ENOSYS;
+
+ result = get_user(mode, (unsigned long *)arg);
+ if (!result && !(LIRC_MODE2REC(mode) & features))
+ result = -EINVAL;
+ break;
+ case LIRC_GET_SEND_MODE:
+ if (!(features&LIRC_CAN_SEND_MASK))
+ return -ENOSYS;
+
+ result = put_user(LIRC_MODE_PULSE, (unsigned long *) arg);
+ break;
+ case LIRC_SET_SEND_MODE:
+ if (!(features&LIRC_CAN_SEND_MASK))
+ return -ENOSYS;
+
+ result = get_user(mode, (unsigned long *) arg);
+ if (!result && mode != LIRC_MODE_PULSE)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return result;
+}
+
+/*
+ * Open the IR device. Get hold of our IR structure and
+ * stash it in private_data for the file
+ */
+static int open(struct inode *node, struct file *filep)
+{
+ struct IR *ir;
+ int ret;
+
+ /* find our IR struct */
+ unsigned minor = MINOR(node->i_rdev);
+ if (minor >= MAX_IRCTL_DEVICES) {
+ dprintk("minor %d: open result = -ENODEV\n",
+ minor);
+ return -ENODEV;
+ }
+ ir = ir_devices[minor];
+
+ /* increment in use count */
+ mutex_lock(&ir->ir_lock);
+ ++ir->open;
+ ret = set_use_inc(ir);
+ if (ret != 0) {
+ --ir->open;
+ mutex_unlock(&ir->ir_lock);
+ return ret;
+ }
+ mutex_unlock(&ir->ir_lock);
+
+ /* stash our IR struct */
+ filep->private_data = ir;
+
+ return 0;
+}
+
+/* Close the IR device */
+static int close(struct inode *node, struct file *filep)
+{
+ /* find our IR struct */
+ struct IR *ir = (struct IR *)filep->private_data;
+ if (ir == NULL) {
+ zilog_error("close: no private_data attached to the file!\n");
+ return -ENODEV;
+ }
+
+ /* decrement in use count */
+ mutex_lock(&ir->ir_lock);
+ --ir->open;
+ set_use_dec(ir);
+ mutex_unlock(&ir->ir_lock);
+
+ return 0;
+}
+
+static struct lirc_driver lirc_template = {
+ .name = "lirc_zilog",
+ .set_use_inc = set_use_inc,
+ .set_use_dec = set_use_dec,
+ .owner = THIS_MODULE
+};
+
+static int ir_remove(struct i2c_client *client);
+static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id);
+static int ir_command(struct i2c_client *client, unsigned int cmd, void *arg);
+
+static const struct i2c_device_id ir_transceiver_id[] = {
+ /* Generic entry for any IR transceiver */
+ { "ir_video", 0 },
+ /* IR device specific entries should be added here */
+ { "ir_tx_z8f0811_haup", 0 },
+ { "ir_rx_z8f0811_haup", 0 },
+ { }
+};
+
+static struct i2c_driver driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "Zilog/Hauppauge i2c IR",
+ },
+ .probe = ir_probe,
+ .remove = ir_remove,
+ .command = ir_command,
+ .id_table = ir_transceiver_id,
+};
+
+static struct file_operations lirc_fops = {
+ .owner = THIS_MODULE,
+ .llseek = lseek,
+ .read = read,
+ .write = write,
+ .poll = poll,
+ .unlocked_ioctl = ioctl,
+ .open = open,
+ .release = close
+};
+
+static int ir_remove(struct i2c_client *client)
+{
+ struct IR *ir = i2c_get_clientdata(client);
+
+ mutex_lock(&ir->ir_lock);
+
+ if (ir->have_rx || ir->have_tx) {
+ DECLARE_COMPLETION(tn);
+ DECLARE_COMPLETION(tn2);
+
+ /* end up polling thread */
+ if (ir->task && !IS_ERR(ir->task)) {
+ ir->t_notify = &tn;
+ ir->t_notify2 = &tn2;
+ ir->shutdown = 1;
+ wake_up_process(ir->task);
+ complete(&tn2);
+ wait_for_completion(&tn);
+ ir->t_notify = NULL;
+ ir->t_notify2 = NULL;
+ }
+
+ } else {
+ mutex_unlock(&ir->ir_lock);
+ zilog_error("%s: detached from something we didn't "
+ "attach to\n", __func__);
+ return -ENODEV;
+ }
+
+ /* unregister lirc driver */
+ if (ir->l.minor >= 0 && ir->l.minor < MAX_IRCTL_DEVICES) {
+ lirc_unregister_driver(ir->l.minor);
+ ir_devices[ir->l.minor] = NULL;
+ }
+
+ /* free memory */
+ lirc_buffer_free(&ir->buf);
+ mutex_unlock(&ir->ir_lock);
+ kfree(ir);
+
+ return 0;
+}
+
+static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct IR *ir = NULL;
+ struct i2c_adapter *adap = client->adapter;
+ char buf;
+ int ret;
+ int have_rx = 0, have_tx = 0;
+
+ dprintk("%s: adapter id=0x%x, client addr=0x%02x\n",
+ __func__, adap->id, client->addr);
+
+ /*
+ * The external IR receiver is at i2c address 0x71.
+ * The IR transmitter is at 0x70.
+ */
+ client->addr = 0x70;
+
+ if (!disable_tx) {
+ if (i2c_master_recv(client, &buf, 1) == 1)
+ have_tx = 1;
+ dprintk("probe 0x70 @ %s: %s\n",
+ adap->name, have_tx ? "success" : "failed");
+ }
+
+ if (!disable_rx) {
+ client->addr = 0x71;
+ if (i2c_master_recv(client, &buf, 1) == 1)
+ have_rx = 1;
+ dprintk("probe 0x71 @ %s: %s\n",
+ adap->name, have_rx ? "success" : "failed");
+ }
+
+ if (!(have_rx || have_tx)) {
+ zilog_error("%s: no devices found\n", adap->name);
+ goto out_nodev;
+ }
+
+ printk(KERN_INFO "lirc_zilog: chip found with %s\n",
+ have_rx && have_tx ? "RX and TX" :
+ have_rx ? "RX only" : "TX only");
+
+ ir = kzalloc(sizeof(struct IR), GFP_KERNEL);
+
+ if (!ir)
+ goto out_nomem;
+
+ ret = lirc_buffer_init(&ir->buf, 2, BUFLEN / 2);
+ if (ret)
+ goto out_nomem;
+
+ mutex_init(&ir->ir_lock);
+ mutex_init(&ir->buf_lock);
+ ir->need_boot = 1;
+
+ memcpy(&ir->l, &lirc_template, sizeof(struct lirc_driver));
+ ir->l.minor = -1;
+
+ /* I2C attach to device */
+ i2c_set_clientdata(client, ir);
+
+ /* initialise RX device */
+ if (have_rx) {
+ DECLARE_COMPLETION(tn);
+ memcpy(&ir->c_rx, client, sizeof(struct i2c_client));
+
+ ir->c_rx.addr = 0x71;
+ strlcpy(ir->c_rx.name, ZILOG_HAUPPAUGE_IR_RX_NAME,
+ I2C_NAME_SIZE);
+
+ /* try to fire up polling thread */
+ ir->t_notify = &tn;
+ ir->task = kthread_run(lirc_thread, ir, "lirc_zilog");
+ if (IS_ERR(ir->task)) {
+ ret = PTR_ERR(ir->task);
+ zilog_error("lirc_register_driver: cannot run "
+ "poll thread %d\n", ret);
+ goto err;
+ }
+ wait_for_completion(&tn);
+ ir->t_notify = NULL;
+ ir->have_rx = 1;
+ }
+
+ /* initialise TX device */
+ if (have_tx) {
+ memcpy(&ir->c_tx, client, sizeof(struct i2c_client));
+ ir->c_tx.addr = 0x70;
+ strlcpy(ir->c_tx.name, ZILOG_HAUPPAUGE_IR_TX_NAME,
+ I2C_NAME_SIZE);
+ ir->have_tx = 1;
+ }
+
+ /* set lirc_dev stuff */
+ ir->l.code_length = 13;
+ ir->l.rbuf = &ir->buf;
+ ir->l.fops = &lirc_fops;
+ ir->l.data = ir;
+ ir->l.minor = minor;
+ ir->l.dev = &adap->dev;
+ ir->l.sample_rate = 0;
+
+ /* register with lirc */
+ ir->l.minor = lirc_register_driver(&ir->l);
+ if (ir->l.minor < 0 || ir->l.minor >= MAX_IRCTL_DEVICES) {
+ zilog_error("ir_attach: \"minor\" must be between 0 and %d "
+ "(%d)!\n", MAX_IRCTL_DEVICES-1, ir->l.minor);
+ ret = -EBADRQC;
+ goto err;
+ }
+
+ /* store this for getting back in open() later on */
+ ir_devices[ir->l.minor] = ir;
+
+ /*
+ * if we have the tx device, load the 'firmware'. We do this
+ * after registering with lirc as otherwise hotplug seems to take
+ * 10s to create the lirc device.
+ */
+ if (have_tx) {
+ /* Special TX init */
+ ret = tx_init(ir);
+ if (ret != 0)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ /* undo everything, hopefully... */
+ if (ir->c_rx.addr)
+ ir_remove(&ir->c_rx);
+ if (ir->c_tx.addr)
+ ir_remove(&ir->c_tx);
+ return ret;
+
+out_nodev:
+ zilog_error("no device found\n");
+ return -ENODEV;
+
+out_nomem:
+ zilog_error("memory allocation failure\n");
+ kfree(ir);
+ return -ENOMEM;
+}
+
+static int ir_command(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+ /* nothing */
+ return 0;
+}
+
+static int __init zilog_init(void)
+{
+ int ret;
+
+ zilog_notify("Zilog/Hauppauge IR driver initializing\n");
+
+ mutex_init(&tx_data_lock);
+
+ request_module("firmware_class");
+
+ ret = i2c_add_driver(&driver);
+ if (ret)
+ zilog_error("initialization failed\n");
+ else
+ zilog_notify("initialization complete\n");
+
+ return ret;
+}
+
+static void __exit zilog_exit(void)
+{
+ i2c_del_driver(&driver);
+ /* if loaded */
+ fw_unload();
+ zilog_notify("Zilog/Hauppauge IR driver unloaded\n");
+}
+
+module_init(zilog_init);
+module_exit(zilog_exit);
+
+MODULE_DESCRIPTION("Zilog/Hauppauge infrared transmitter driver (i2c stack)");
+MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, "
+ "Ulrich Mueller, Stefan Jahn, Jerome Brock, Mark Weaver");
+MODULE_LICENSE("GPL");
+/* for compat with old name, which isn't all that accurate anymore */
+MODULE_ALIAS("lirc_pvr150");
+
+module_param(minor, int, 0444);
+MODULE_PARM_DESC(minor, "Preferred minor device number");
+
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
+
+module_param(disable_rx, bool, 0644);
+MODULE_PARM_DESC(disable_rx, "Disable the IR receiver device");
+
+module_param(disable_tx, bool, 0644);
+MODULE_PARM_DESC(disable_tx, "Disable the IR transmitter device");
--
1.7.1.1
--
Jarod Wilson
jarod@...hat.com
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