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-rw-r--r--include/linux/serdev.h13
-rw-r--r--include/linux/serial_core.h80
-rw-r--r--include/linux/tty_buffer.h5
-rw-r--r--include/linux/tty_flip.h4
-rw-r--r--include/uapi/linux/serial.h55
5 files changed, 122 insertions, 35 deletions
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 66f624fc618c..5f6bfe4f6d95 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -7,6 +7,7 @@
#include <linux/types.h>
#include <linux/device.h>
+#include <linux/iopoll.h>
#include <linux/uaccess.h>
#include <linux/termios.h>
#include <linux/delay.h>
@@ -279,18 +280,10 @@ static inline bool serdev_device_get_cts(struct serdev_device *serdev)
static inline int serdev_device_wait_for_cts(struct serdev_device *serdev, bool state, int timeout_ms)
{
- unsigned long timeout;
bool signal;
- timeout = jiffies + msecs_to_jiffies(timeout_ms);
- while (time_is_after_jiffies(timeout)) {
- signal = serdev_device_get_cts(serdev);
- if (signal == state)
- return 0;
- usleep_range(1000, 2000);
- }
-
- return -ETIMEDOUT;
+ return readx_poll_timeout(serdev_device_get_cts, serdev, signal, signal == state,
+ 2000, timeout_ms * 1000);
}
static inline int serdev_device_set_rts(struct serdev_device *serdev, bool enable)
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 91871464b99d..fd59f600094a 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -664,6 +664,86 @@ struct uart_driver {
void uart_write_wakeup(struct uart_port *port);
+#define __uart_port_tx(uport, ch, tx_ready, put_char, tx_done, for_test, \
+ for_post) \
+({ \
+ struct uart_port *__port = (uport); \
+ struct circ_buf *xmit = &__port->state->xmit; \
+ unsigned int pending; \
+ \
+ for (; (for_test) && (tx_ready); (for_post), __port->icount.tx++) { \
+ if (__port->x_char) { \
+ (ch) = __port->x_char; \
+ (put_char); \
+ __port->x_char = 0; \
+ continue; \
+ } \
+ \
+ if (uart_circ_empty(xmit) || uart_tx_stopped(__port)) \
+ break; \
+ \
+ (ch) = xmit->buf[xmit->tail]; \
+ (put_char); \
+ xmit->tail = (xmit->tail + 1) % UART_XMIT_SIZE; \
+ } \
+ \
+ (tx_done); \
+ \
+ pending = uart_circ_chars_pending(xmit); \
+ if (pending < WAKEUP_CHARS) { \
+ uart_write_wakeup(__port); \
+ \
+ if (pending == 0) \
+ __port->ops->stop_tx(__port); \
+ } \
+ \
+ pending; \
+})
+
+/**
+ * uart_port_tx_limited -- transmit helper for uart_port with count limiting
+ * @port: uart port
+ * @ch: variable to store a character to be written to the HW
+ * @count: a limit of characters to send
+ * @tx_ready: can HW accept more data function
+ * @put_char: function to write a character
+ * @tx_done: function to call after the loop is done
+ *
+ * This helper transmits characters from the xmit buffer to the hardware using
+ * @put_char(). It does so until @count characters are sent and while @tx_ready
+ * evaluates to true.
+ *
+ * Returns: the number of characters in the xmit buffer when done.
+ *
+ * The expression in macro parameters shall be designed as follows:
+ * * **tx_ready:** should evaluate to true if the HW can accept more data to
+ * be sent. This parameter can be %true, which means the HW is always ready.
+ * * **put_char:** shall write @ch to the device of @port.
+ * * **tx_done:** when the write loop is done, this can perform arbitrary
+ * action before potential invocation of ops->stop_tx() happens. If the
+ * driver does not need to do anything, use e.g. ({}).
+ *
+ * For all of them, @port->lock is held, interrupts are locally disabled and
+ * the expressions must not sleep.
+ */
+#define uart_port_tx_limited(port, ch, count, tx_ready, put_char, tx_done) ({ \
+ unsigned int __count = (count); \
+ __uart_port_tx(port, ch, tx_ready, put_char, tx_done, __count, \
+ __count--); \
+})
+
+/**
+ * uart_port_tx -- transmit helper for uart_port
+ * @port: uart port
+ * @ch: variable to store a character to be written to the HW
+ * @tx_ready: can HW accept more data function
+ * @put_char: function to write a character
+ *
+ * See uart_port_tx_limited() for more details.
+ */
+#define uart_port_tx(port, ch, tx_ready, put_char) \
+ __uart_port_tx(port, ch, tx_ready, put_char, ({}), true, ({}))
+
/*
* Baud rate helpers.
*/
diff --git a/include/linux/tty_buffer.h b/include/linux/tty_buffer.h
index 1796648c2907..6ceb2789e6c8 100644
--- a/include/linux/tty_buffer.h
+++ b/include/linux/tty_buffer.h
@@ -17,14 +17,11 @@ struct tty_buffer {
int commit;
int lookahead; /* Lazy update on recv, can become less than "read" */
int read;
- int flags;
+ bool flags;
/* Data points here */
unsigned long data[];
};
-/* Values for .flags field of tty_buffer */
-#define TTYB_NORMAL 1 /* buffer has no flags buffer */
-
static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
{
return ((unsigned char *)b->data) + ofs;
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
index 483d41cbcbb7..bfaaeee61a05 100644
--- a/include/linux/tty_flip.h
+++ b/include/linux/tty_flip.h
@@ -25,9 +25,9 @@ static inline int tty_insert_flip_char(struct tty_port *port,
struct tty_buffer *tb = port->buf.tail;
int change;
- change = (tb->flags & TTYB_NORMAL) && (flag != TTY_NORMAL);
+ change = !tb->flags && (flag != TTY_NORMAL);
if (!change && tb->used < tb->size) {
- if (~tb->flags & TTYB_NORMAL)
+ if (tb->flags)
*flag_buf_ptr(tb, tb->used) = flag;
*char_buf_ptr(tb, tb->used++) = ch;
return 1;
diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h
index cea06924b295..53bc1af67a41 100644
--- a/include/uapi/linux/serial.h
+++ b/include/uapi/linux/serial.h
@@ -107,33 +107,50 @@ struct serial_icounter_struct {
int reserved[9];
};
-/*
+/**
+ * struct serial_rs485 - serial interface for controlling RS485 settings.
+ * @flags: RS485 feature flags.
+ * @delay_rts_before_send: Delay before send (milliseconds).
+ * @delay_rts_after_send: Delay after send (milliseconds).
+ * @addr_recv: Receive filter for RS485 addressing mode
+ * (used only when %SER_RS485_ADDR_RECV is set).
+ * @addr_dest: Destination address for RS485 addressing mode
+ * (used only when %SER_RS485_ADDR_DEST is set).
+ * @padding0: Padding (set to zero).
+ * @padding1: Padding (set to zero).
+ * @padding: Deprecated, use @padding0 and @padding1 instead.
+ * Do not use with @addr_recv and @addr_dest (due to
+ * overlap).
+ *
* Serial interface for controlling RS485 settings on chips with suitable
* support. Set with TIOCSRS485 and get with TIOCGRS485 if supported by your
* platform. The set function returns the new state, with any unsupported bits
* reverted appropriately.
+ *
+ * The flag bits are:
+ *
+ * * %SER_RS485_ENABLED - RS485 enabled.
+ * * %SER_RS485_RTS_ON_SEND - Logical level for RTS pin when sending.
+ * * %SER_RS485_RTS_AFTER_SEND - Logical level for RTS pin after sent.
+ * * %SER_RS485_RX_DURING_TX - Full-duplex RS485 line.
+ * * %SER_RS485_TERMINATE_BUS - Enable bus termination (if supported).
+ * * %SER_RS485_ADDRB - Enable RS485 addressing mode.
+ * * %SER_RS485_ADDR_RECV - Receive address filter (enables @addr_recv). Requires %SER_RS485_ADDRB.
+ * * %SER_RS485_ADDR_DEST - Destination address (enables @addr_dest). Requires %SER_RS485_ADDRB.
*/
-
struct serial_rs485 {
- __u32 flags; /* RS485 feature flags */
-#define SER_RS485_ENABLED (1 << 0) /* If enabled */
-#define SER_RS485_RTS_ON_SEND (1 << 1) /* Logical level for
- RTS pin when
- sending */
-#define SER_RS485_RTS_AFTER_SEND (1 << 2) /* Logical level for
- RTS pin after sent*/
+ __u32 flags;
+#define SER_RS485_ENABLED (1 << 0)
+#define SER_RS485_RTS_ON_SEND (1 << 1)
+#define SER_RS485_RTS_AFTER_SEND (1 << 2)
#define SER_RS485_RX_DURING_TX (1 << 4)
-#define SER_RS485_TERMINATE_BUS (1 << 5) /* Enable bus
- termination
- (if supported) */
-
-/* RS-485 addressing mode */
-#define SER_RS485_ADDRB (1 << 6) /* Enable addressing mode */
-#define SER_RS485_ADDR_RECV (1 << 7) /* Receive address filter */
-#define SER_RS485_ADDR_DEST (1 << 8) /* Destination address */
+#define SER_RS485_TERMINATE_BUS (1 << 5)
+#define SER_RS485_ADDRB (1 << 6)
+#define SER_RS485_ADDR_RECV (1 << 7)
+#define SER_RS485_ADDR_DEST (1 << 8)
- __u32 delay_rts_before_send; /* Delay before send (milliseconds) */
- __u32 delay_rts_after_send; /* Delay after send (milliseconds) */
+ __u32 delay_rts_before_send;
+ __u32 delay_rts_after_send;
/* The fields below are defined by flags */
union {
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-23 20:05:31 +0000