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synced 2026-09-24 19:13:47 +08:00
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This commit is contained in:
Florian Pose
+280
-11
@@ -38,6 +38,7 @@
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/termios.h>
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#include <linux/timer.h>
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#include "../master/globals.h"
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#include "../include/ectty.h"
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@@ -47,6 +48,7 @@
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#define PFX "ec_tty: "
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#define EC_TTY_MAX_DEVICES 10
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#define EC_TTY_TX_BUFFER_SIZE 100
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/*****************************************************************************/
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@@ -71,16 +73,6 @@ MODULE_PARM_DESC(debug_level, "Debug level");
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/** \endcond */
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static int ec_tty_open(struct tty_struct *, struct file *);
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static void ec_tty_close(struct tty_struct *, struct file *);
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static int ec_tty_write(struct tty_struct *, const unsigned char *, int);
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static const struct tty_operations ec_tty_ops = {
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.open = ec_tty_open,
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.close = ec_tty_close,
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.write = ec_tty_write,
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};
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static struct ktermios ec_tty_std_termios = {
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.c_iflag = ICRNL | IXON,
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.c_oflag = OPOST | ONLCR,
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@@ -92,8 +84,16 @@ static struct ktermios ec_tty_std_termios = {
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struct ec_tty {
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int minor;
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struct device *dev;
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uint8_t tx_buffer[EC_TTY_TX_BUFFER_SIZE];
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unsigned int tx_read_idx;
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unsigned int tx_write_idx;
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unsigned int wakeup;
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struct timer_list timer;
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struct tty_struct *tty;
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};
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static const struct tty_operations ec_tty_ops; // see below
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/*****************************************************************************/
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/** Module initialization.
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@@ -160,9 +160,32 @@ void __exit ec_tty_cleanup_module(void)
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/*****************************************************************************/
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void ec_tty_wakeup(unsigned long data)
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{
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ec_tty_t *tty = (ec_tty_t *) data;
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if (tty->wakeup) {
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if (tty->tty) {
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printk("Waking up.\n");
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tty_wakeup(tty->tty);
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}
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tty->wakeup = 0;
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}
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tty->timer.expires += 1;
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add_timer(&tty->timer);
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}
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/*****************************************************************************/
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int ec_tty_init(ec_tty_t *tty, int minor)
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{
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tty->minor = minor;
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tty->tx_read_idx = 0;
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tty->tx_write_idx = 0;
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tty->wakeup = 0;
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init_timer(&tty->timer);
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tty->tty = NULL;
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tty->dev = tty_register_device(tty_driver, tty->minor, NULL);
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if (IS_ERR(tty->dev)) {
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@@ -170,6 +193,10 @@ int ec_tty_init(ec_tty_t *tty, int minor)
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return PTR_ERR(tty->dev);
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}
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tty->timer.function = ec_tty_wakeup;
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tty->timer.data = (unsigned long) tty;
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tty->timer.expires = jiffies + 10;
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add_timer(&tty->timer);
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return 0;
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}
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@@ -177,9 +204,32 @@ int ec_tty_init(ec_tty_t *tty, int minor)
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void ec_tty_clear(ec_tty_t *tty)
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{
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del_timer_sync(&tty->timer);
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tty_unregister_device(tty_driver, tty->minor);
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}
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/*****************************************************************************/
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unsigned int ec_tty_tx_size(ec_tty_t *tty)
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{
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unsigned int ret;
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if (tty->tx_write_idx >= tty->tx_read_idx) {
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ret = tty->tx_write_idx - tty->tx_read_idx;
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} else {
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ret = EC_TTY_TX_BUFFER_SIZE + tty->tx_write_idx - tty->tx_read_idx;
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}
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return ret;
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}
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/*****************************************************************************/
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unsigned int ec_tty_tx_space(ec_tty_t *tty)
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{
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return EC_TTY_TX_BUFFER_SIZE - 1 - ec_tty_tx_size(tty);
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}
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/******************************************************************************
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* Device callbacks
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*****************************************************************************/
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@@ -200,6 +250,11 @@ static int ec_tty_open(struct tty_struct *tty, struct file *file)
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return -ENXIO;
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}
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if (t->tty) {
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return -EBUSY;
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}
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t->tty = tty;
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tty->driver_data = t;
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return 0;
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}
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@@ -208,7 +263,13 @@ static int ec_tty_open(struct tty_struct *tty, struct file *file)
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static void ec_tty_close(struct tty_struct *tty, struct file *file)
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{
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ec_tty_t *t = (ec_tty_t *) tty->driver_data;
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printk(KERN_INFO PFX "Closing line %i.\n", tty->index);
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if (t->tty == tty) {
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t->tty = NULL;
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}
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}
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/*****************************************************************************/
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@@ -219,9 +280,190 @@ static int ec_tty_write(
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int count
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)
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{
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return -EIO;
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ec_tty_t *t = (ec_tty_t *) tty->driver_data;
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unsigned int data_size, i;
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printk(KERN_INFO PFX "%s(count=%i)\n", __func__, count);
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if (count <= 0) {
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return 0;
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}
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data_size = min(ec_tty_tx_space(t), (unsigned int) count);
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for (i = 0; i < data_size; i++) {
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t->tx_buffer[t->tx_write_idx] = buffer[i];
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t->tx_write_idx = (t->tx_write_idx + 1) % EC_TTY_TX_BUFFER_SIZE;
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}
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printk(KERN_INFO PFX "%s(): %u bytes written.\n", __func__, data_size);
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return data_size;
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}
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/*****************************************************************************/
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static void ec_tty_put_char(struct tty_struct *tty, unsigned char ch)
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{
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ec_tty_t *t = (ec_tty_t *) tty->driver_data;
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printk(KERN_INFO PFX "%s(): c=%02x.\n", __func__, (unsigned int) ch);
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if (ec_tty_tx_space(t)) {
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t->tx_buffer[t->tx_write_idx] = ch;
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t->tx_write_idx = (t->tx_write_idx + 1) % EC_TTY_TX_BUFFER_SIZE;
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} else {
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printk(KERN_WARNING PFX "%s(): Dropped a byte!\n", __func__);
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}
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}
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/*****************************************************************************/
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static int ec_tty_write_room(struct tty_struct *tty)
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{
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ec_tty_t *t = (ec_tty_t *) tty->driver_data;
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int ret = ec_tty_tx_space(t);
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printk(KERN_INFO PFX "%s() = %i.\n", __func__, ret);
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return ret;
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}
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/*****************************************************************************/
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static int ec_tty_chars_in_buffer(struct tty_struct *tty)
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{
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ec_tty_t *t = (ec_tty_t *) tty->driver_data;
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int ret;
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printk(KERN_INFO PFX "%s().\n", __func__);
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ret = ec_tty_tx_size(t);
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printk(KERN_INFO PFX "%s() = %i.\n", __func__, ret);
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return ret;
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}
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/*****************************************************************************/
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static void ec_tty_flush_buffer(struct tty_struct *tty)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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}
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/*****************************************************************************/
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static int ec_tty_ioctl(struct tty_struct *tty, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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return -ENOTTY;
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}
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/*****************************************************************************/
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static void ec_tty_throttle(struct tty_struct *tty)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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}
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/*****************************************************************************/
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static void ec_tty_unthrottle(struct tty_struct *tty)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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}
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/*****************************************************************************/
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static void ec_tty_set_termios(struct tty_struct *tty,
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struct ktermios *old_termios)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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}
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/*****************************************************************************/
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static void ec_tty_stop(struct tty_struct *tty)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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}
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/*****************************************************************************/
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static void ec_tty_start(struct tty_struct *tty)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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}
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/*****************************************************************************/
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static void ec_tty_hangup(struct tty_struct *tty)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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}
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/*****************************************************************************/
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static void ec_tty_break(struct tty_struct *tty, int break_state)
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{
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printk(KERN_INFO PFX "%s(break_state = %i).\n", __func__, break_state);
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}
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/*****************************************************************************/
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static void ec_tty_send_xchar(struct tty_struct *tty, char ch)
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{
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printk(KERN_INFO PFX "%s(ch=%02x).\n", __func__, (unsigned int) ch);
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}
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/*****************************************************************************/
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static void ec_tty_wait_until_sent(struct tty_struct *tty, int timeout)
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{
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printk(KERN_INFO PFX "%s(timeout=%i).\n", __func__, timeout);
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}
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/*****************************************************************************/
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static int ec_tty_tiocmget(struct tty_struct *tty, struct file *file)
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{
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printk(KERN_INFO PFX "%s().\n", __func__);
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return -EBUSY;
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}
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/*****************************************************************************/
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static int ec_tty_tiocmset(struct tty_struct *tty, struct file *file,
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unsigned int set, unsigned int clear)
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{
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printk(KERN_INFO PFX "%s(set=%u, clear=%u).\n", __func__, set, clear);
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return -EBUSY;
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}
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/*****************************************************************************/
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static const struct tty_operations ec_tty_ops = {
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.open = ec_tty_open,
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.close = ec_tty_close,
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.write = ec_tty_write,
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.put_char = ec_tty_put_char,
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.write_room = ec_tty_write_room,
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.chars_in_buffer = ec_tty_chars_in_buffer,
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.flush_buffer = ec_tty_flush_buffer,
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.ioctl = ec_tty_ioctl,
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.throttle = ec_tty_throttle,
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.unthrottle = ec_tty_unthrottle,
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.set_termios = ec_tty_set_termios,
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.stop = ec_tty_stop,
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.start = ec_tty_start,
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.hangup = ec_tty_hangup,
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.break_ctl = ec_tty_break,
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.send_xchar = ec_tty_send_xchar,
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.wait_until_sent = ec_tty_wait_until_sent,
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.tiocmget = ec_tty_tiocmget,
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.tiocmset = ec_tty_tiocmset,
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};
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/******************************************************************************
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* Public functions and methods
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*****************************************************************************/
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@@ -237,6 +479,8 @@ ec_tty_t *ectty_create(void)
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for (minor = 0; minor < EC_TTY_MAX_DEVICES; minor++) {
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if (!ttys[minor]) {
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printk(KERN_INFO PFX "Creating TTY interface %i.\n", minor);
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tty = kmalloc(sizeof(ec_tty_t), GFP_KERNEL);
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if (!tty) {
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up(&tty_sem);
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@@ -266,6 +510,8 @@ ec_tty_t *ectty_create(void)
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void ectty_free(ec_tty_t *tty)
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{
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printk(KERN_INFO PFX "Freeing TTY interface %i.\n", tty->minor);
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ec_tty_clear(tty);
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ttys[tty->minor] = NULL;
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kfree(tty);
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@@ -273,6 +519,28 @@ void ectty_free(ec_tty_t *tty)
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/*****************************************************************************/
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unsigned int ectty_tx_data(ec_tty_t *tty, uint8_t *buffer, size_t size)
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{
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unsigned int data_size = min(ec_tty_tx_size(tty), size), i;
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if (data_size) {
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printk(KERN_INFO PFX "Fetching %u bytes to send.\n", data_size);
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}
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for (i = 0; i < data_size; i++) {
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buffer[i] = tty->tx_buffer[tty->tx_read_idx];
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tty->tx_read_idx = (tty->tx_read_idx + 1) % EC_TTY_TX_BUFFER_SIZE;
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}
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if (data_size) {
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tty->wakeup = 1;
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}
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return data_size;
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}
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/*****************************************************************************/
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/** \cond */
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module_init(ec_tty_init_module);
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@@ -280,6 +548,7 @@ module_exit(ec_tty_cleanup_module);
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EXPORT_SYMBOL(ectty_create);
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EXPORT_SYMBOL(ectty_free);
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EXPORT_SYMBOL(ectty_tx_data);
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/** \endcond */
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