From: Jarod Wilson Date: Mon, 26 Jul 2010 23:34:04 +0000 (-0300) Subject: V4L/DVB: staging/lirc: add lirc_zilog driver X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=69b1214c2c9189cd0fae7a79ee266d50261be9c8;p=linux-beck.git V4L/DVB: staging/lirc: add lirc_zilog driver Commonly found on several Hauppauge video capture devices. Signed-off-by: Jarod Wilson Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/staging/lirc/lirc_zilog.c b/drivers/staging/lirc/lirc_zilog.c new file mode 100644 index 000000000000..1b013bf33899 --- /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 + * modified for PixelView (BT878P+W/FM) by + * Michal Kochanowicz + * Christoph Bartelmus + * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by + * Ulrich Mueller + * modified for Asus TV-Box and Creative/VisionTek BreakOut-Box by + * Stefan Jahn + * modified for inclusion into kernel sources by + * Jerome Brock + * modified for Leadtek Winfast PVR2000 by + * Thomas Reitmayr (treitmayr@yahoo.com) + * modified for Hauppauge PVR-150 IR TX device by + * Mark Weaver + * changed name from lirc_pvr150 to lirc_zilog, works on more than pvr-150 + * Jarod Wilson + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include + +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");