The F81232 will report data and LSR with bulk like following format:
bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]...
LSR will auto clear frame/parity/break error flag when reading by H/W,
but overrrun will only cleared when reading LSR. So this patch add a
worker to read LSR when overrun and flush the worker on close() &
suspend().
Cc: Oliver Neukum <[email protected]>
Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
---
v8:
1: Fix usb_submit_urb() in f81232_resume() with GFP_NOIO, not
GFP_KERNEL.
v7:
1: Remove serial->suspending check
2: Add port priv is_port_open to save port open state. We'll
register interrupt-in urb in f81232_resume() when port is
opened.
3: Using usb_kill_urb for read/interrupt urb to ensure urb
stopped.
v6:
1: Add deferred_lsr_work_needed to re-trigger when f81232_resume()
v5:
1: Source code base revert to v3 and remove all v4 changes.
2: Add serial->suspending check in f81232_process_read_urb()
before schedule_work(&priv->lsr_work) to avoid race condition.
v4:
1: Add serial->suspending check in f81232_lsr_worker() to avoid
re-trigger
2: Add port_priv-lsr_work_resched to re-trigger LSR worker
v3:
1: Add flush_work(&port_priv->lsr_work) in f81232_suspend().
v2:
1: Add flush_work(&port_priv->lsr_work) in f81232_close().
drivers/usb/serial/f81232.c | 97 +++++++++++++++++++++++++++++++++++++++++----
1 file changed, 89 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 0dcdcb4b2cde..1f0dd4087d79 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -41,12 +41,15 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
+#define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS)
#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
struct f81232_private {
struct mutex lock;
u8 modem_control;
u8 modem_status;
+ bool is_port_open;
+ struct work_struct lsr_work;
struct work_struct interrupt_work;
struct usb_serial_port *port;
};
@@ -282,6 +285,7 @@ static void f81232_read_int_callback(struct urb *urb)
static void f81232_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
+ struct f81232_private *priv = usb_get_serial_port_data(port);
unsigned char *data = urb->transfer_buffer;
char tty_flag;
unsigned int i;
@@ -315,6 +319,7 @@ static void f81232_process_read_urb(struct urb *urb)
if (lsr & UART_LSR_OE) {
port->icount.overrun++;
+ schedule_work(&priv->lsr_work);
tty_insert_flip_char(&port->port, 0,
TTY_OVERRUN);
}
@@ -528,37 +533,52 @@ static int f81232_tiocmset(struct tty_struct *tty,
static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
{
- int result;
-
- result = f81232_port_enable(port);
- if (result)
- return result;
+ struct f81232_private *port_priv = usb_get_serial_port_data(port);
+ int result = 0;
/* Setup termios */
if (tty)
f81232_set_termios(tty, port, NULL);
+ mutex_lock(&port_priv->lock);
+
+ result = f81232_port_enable(port);
+ if (result)
+ goto end;
+
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "%s - failed submitting interrupt urb,"
" error %d\n", __func__, result);
- return result;
+ goto end;
}
result = usb_serial_generic_open(tty, port);
if (result) {
usb_kill_urb(port->interrupt_in_urb);
- return result;
+ goto end;
}
- return 0;
+ port_priv->is_port_open = true;
+end:
+ mutex_unlock(&port_priv->lock);
+
+ return result;
}
static void f81232_close(struct usb_serial_port *port)
{
+ struct f81232_private *port_priv = usb_get_serial_port_data(port);
+
+ mutex_lock(&port_priv->lock);
+
f81232_port_disable(port);
usb_serial_generic_close(port);
usb_kill_urb(port->interrupt_in_urb);
+ flush_work(&port_priv->lsr_work);
+ port_priv->is_port_open = false;
+
+ mutex_unlock(&port_priv->lock);
}
static void f81232_dtr_rts(struct usb_serial_port *port, int on)
@@ -603,6 +623,21 @@ static void f81232_interrupt_work(struct work_struct *work)
f81232_read_msr(priv->port);
}
+static void f81232_lsr_worker(struct work_struct *work)
+{
+ struct f81232_private *priv;
+ struct usb_serial_port *port;
+ int status;
+ u8 tmp;
+
+ priv = container_of(work, struct f81232_private, lsr_work);
+ port = priv->port;
+
+ status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
+ if (status)
+ dev_warn(&port->dev, "read LSR failed: %d\n", status);
+}
+
static int f81232_port_probe(struct usb_serial_port *port)
{
struct f81232_private *priv;
@@ -613,6 +648,7 @@ static int f81232_port_probe(struct usb_serial_port *port)
mutex_init(&priv->lock);
INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);
+ INIT_WORK(&priv->lsr_work, f81232_lsr_worker);
usb_set_serial_port_data(port, priv);
@@ -632,6 +668,49 @@ static int f81232_port_remove(struct usb_serial_port *port)
return 0;
}
+static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
+{
+ struct usb_serial_port *port = serial->port[0];
+ struct f81232_private *port_priv = usb_get_serial_port_data(port);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
+ usb_kill_urb(port->read_urbs[i]);
+
+ usb_kill_urb(port->interrupt_in_urb);
+
+ if (port_priv)
+ flush_work(&port_priv->lsr_work);
+
+ return 0;
+}
+
+static int f81232_resume(struct usb_serial *serial)
+{
+ struct usb_serial_port *port = serial->port[0];
+ struct f81232_private *port_priv = usb_get_serial_port_data(port);
+ int result = 0;
+
+ mutex_lock(&port_priv->lock);
+
+ if (port_priv && port_priv->is_port_open) {
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
+ if (result) {
+ dev_err(&port->dev,
+ "%s: submit interrupt urb failed: %d",
+ __func__, result);
+ goto end;
+ }
+ }
+
+ result = usb_serial_generic_resume(serial);
+
+end:
+ mutex_unlock(&port_priv->lock);
+
+ return result;
+}
+
static struct usb_serial_driver f81232_device = {
.driver = {
.owner = THIS_MODULE,
@@ -655,6 +734,8 @@ static struct usb_serial_driver f81232_device = {
.read_int_callback = f81232_read_int_callback,
.port_probe = f81232_port_probe,
.port_remove = f81232_port_remove,
+ .suspend = f81232_suspend,
+ .resume = f81232_resume,
};
static struct usb_serial_driver * const serial_drivers[] = {
--
2.7.4
The F81232 had 4 clocksource 1.846/18.46/14.77/24MHz and baud rates
can be up to 1.5Mbits with 24MHz.
F81232 Clock registers (106h)
Bit1-0: Clock source selector
00: 1.846MHz.
01: 18.46MHz.
10: 24MHz.
11: 14.77MHz.
Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
---
v8:
1: no change
v7:
1: no change
v6:
1: no change
v5:
1: no change
v4:
1: no change
v3:
1: change the baud_base in f81232_get_serial_info()
drivers/usb/serial/f81232.c | 105 +++++++++++++++++++++++++++++++++++++++-----
1 file changed, 94 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 25ec47d7f318..3da70f406a81 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -28,7 +28,8 @@ static const struct usb_device_id id_table[] = {
MODULE_DEVICE_TABLE(usb, id_table);
/* Maximum baudrate for F81232 */
-#define F81232_MAX_BAUDRATE 115200
+#define F81232_MAX_BAUDRATE 1500000
+#define F81232_DEF_BAUDRATE 9600
/* USB Control EP parameter */
#define F81232_REGISTER_REQUEST 0xa0
@@ -44,19 +45,43 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS)
#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
+/*
+ * F81232 Clock registers (106h)
+ *
+ * Bit1-0: Clock source selector
+ * 00: 1.846MHz.
+ * 01: 18.46MHz.
+ * 10: 24MHz.
+ * 11: 14.77MHz.
+ */
+#define F81232_CLK_REGISTER 0x106
+#define F81232_CLK_1_846_MHZ 0
+#define F81232_CLK_18_46_MHZ BIT(0)
+#define F81232_CLK_24_MHZ BIT(1)
+#define F81232_CLK_14_77_MHZ (BIT(1) | BIT(0))
+#define F81232_CLK_MASK GENMASK(1, 0)
+
struct f81232_private {
struct mutex lock;
u8 modem_control;
u8 modem_status;
bool is_port_open;
+ speed_t baud_base;
struct work_struct lsr_work;
struct work_struct interrupt_work;
struct usb_serial_port *port;
};
-static int calc_baud_divisor(speed_t baudrate)
+static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
+static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ,
+ F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ };
+
+static int calc_baud_divisor(speed_t baudrate, speed_t clockrate)
{
- return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
+ if (!baudrate)
+ return 0;
+
+ return DIV_ROUND_CLOSEST(clockrate, baudrate);
}
static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
@@ -130,6 +155,21 @@ static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
return status;
}
+static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
+ u8 mask, u8 val)
+{
+ int status;
+ u8 tmp;
+
+ status = f81232_get_register(port, reg, &tmp);
+ if (status)
+ return status;
+
+ tmp = (tmp & ~mask) | (val & mask);
+
+ return f81232_set_register(port, reg, tmp);
+}
+
static void f81232_read_msr(struct usb_serial_port *port)
{
int status;
@@ -347,13 +387,53 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state)
*/
}
-static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
+static int f81232_find_clk(speed_t baudrate)
+{
+ int idx;
+
+ for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
+ if (baudrate <= baudrate_table[idx] &&
+ baudrate_table[idx] % baudrate == 0)
+ return idx;
+ }
+
+ return -EINVAL;
+}
+
+static void f81232_set_baudrate(struct tty_struct *tty,
+ struct usb_serial_port *port, speed_t baudrate,
+ speed_t old_baudrate)
{
+ struct f81232_private *priv = usb_get_serial_port_data(port);
u8 lcr;
int divisor;
int status = 0;
+ int i;
+ int idx;
+ speed_t baud_list[] = {baudrate, old_baudrate, F81232_DEF_BAUDRATE};
+
+ for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
+ idx = f81232_find_clk(baud_list[i]);
+ if (idx >= 0) {
+ baudrate = baud_list[i];
+ tty_encode_baud_rate(tty, baudrate, baudrate);
+ break;
+ }
+ }
+
+ if (idx < 0)
+ return;
- divisor = calc_baud_divisor(baudrate);
+ priv->baud_base = baudrate_table[idx];
+ divisor = calc_baud_divisor(baudrate, priv->baud_base);
+
+ status = f81232_set_mask_register(port, F81232_CLK_REGISTER,
+ F81232_CLK_MASK, clock_table[idx]);
+ if (status) {
+ dev_err(&port->dev, "%s failed to set CLK_REG: %d\n",
+ __func__, status);
+ return;
+ }
status = f81232_get_register(port, LINE_CONTROL_REGISTER,
&lcr); /* get LCR */
@@ -443,6 +523,7 @@ static void f81232_set_termios(struct tty_struct *tty,
u8 new_lcr = 0;
int status = 0;
speed_t baudrate;
+ speed_t old_baud;
/* Don't change anything if nothing has changed */
if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
@@ -455,11 +536,12 @@ static void f81232_set_termios(struct tty_struct *tty,
baudrate = tty_get_baud_rate(tty);
if (baudrate > 0) {
- if (baudrate > F81232_MAX_BAUDRATE) {
- baudrate = F81232_MAX_BAUDRATE;
- tty_encode_baud_rate(tty, baudrate, baudrate);
- }
- f81232_set_baudrate(port, baudrate);
+ if (old_termios)
+ old_baud = tty_termios_baud_rate(old_termios);
+ else
+ old_baud = F81232_DEF_BAUDRATE;
+
+ f81232_set_baudrate(tty, port, baudrate, old_baud);
}
if (C_PARENB(tty)) {
@@ -608,11 +690,12 @@ static int f81232_get_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct usb_serial_port *port = tty->driver_data;
+ struct f81232_private *priv = usb_get_serial_port_data(port);
ss->type = PORT_16550A;
ss->line = port->minor;
ss->port = port->port_number;
- ss->baud_base = F81232_MAX_BAUDRATE;
+ ss->baud_base = priv->baud_base;
return 0;
}
--
2.7.4
Implement Fintek F81232 break on/off with LCR register.
It's the same with 16550A LCR register layout.
Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
---
v8:
1: no change
v7:
1: no change
v6:
1: no change
v5:
1: no change
v4:
1: no change
v3:
1: using shadow_lcr to save LCR in f81232_break_ctl()
drivers/usb/serial/f81232.c | 29 +++++++++++++++++++++++------
1 file changed, 23 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 3da70f406a81..d852bf3b8df8 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -65,6 +65,7 @@ struct f81232_private {
struct mutex lock;
u8 modem_control;
u8 modem_status;
+ u8 shadow_lcr;
bool is_port_open;
speed_t baud_base;
struct work_struct lsr_work;
@@ -378,13 +379,23 @@ static void f81232_process_read_urb(struct urb *urb)
static void f81232_break_ctl(struct tty_struct *tty, int break_state)
{
- /* FIXME - Stubbed out for now */
+ struct usb_serial_port *port = tty->driver_data;
+ struct f81232_private *priv = usb_get_serial_port_data(port);
+ int status;
- /*
- * break_state = -1 to turn on break, and 0 to turn off break
- * see drivers/char/tty_io.c to see it used.
- * last_set_data_urb_value NEVER has the break bit set in it.
- */
+ mutex_lock(&priv->lock);
+
+ if (break_state)
+ priv->shadow_lcr |= UART_LCR_SBC;
+ else
+ priv->shadow_lcr &= ~UART_LCR_SBC;
+
+ status = f81232_set_register(port, LINE_CONTROL_REGISTER,
+ priv->shadow_lcr);
+ if (status)
+ dev_err(&port->dev, "set break failed: %d\n", status);
+
+ mutex_unlock(&priv->lock);
}
static int f81232_find_clk(speed_t baudrate)
@@ -520,6 +531,7 @@ static int f81232_port_disable(struct usb_serial_port *port)
static void f81232_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
+ struct f81232_private *priv = usb_get_serial_port_data(port);
u8 new_lcr = 0;
int status = 0;
speed_t baudrate;
@@ -573,11 +585,16 @@ static void f81232_set_termios(struct tty_struct *tty,
break;
}
+ mutex_lock(&priv->lock);
+
+ new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
if (status) {
dev_err(&port->dev, "%s failed to set LCR: %d\n",
__func__, status);
}
+
+ mutex_unlock(&priv->lock);
}
static int f81232_tiocmget(struct tty_struct *tty)
--
2.7.4
The F81232 will use LSR/Interrupt worker to handle LSR error & MSR
change. This patch will fix the interrupt work should stop in close()
and suspend().
Cc: Johan Hovold <[email protected]>
Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
---
v8:
1: no change
v7:
1: first introduce to this series patch.
drivers/usb/serial/f81232.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 1f0dd4087d79..25ec47d7f318 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -576,6 +576,7 @@ static void f81232_close(struct usb_serial_port *port)
usb_serial_generic_close(port);
usb_kill_urb(port->interrupt_in_urb);
flush_work(&port_priv->lsr_work);
+ flush_work(&port_priv->interrupt_work);
port_priv->is_port_open = false;
mutex_unlock(&port_priv->lock);
@@ -679,8 +680,10 @@ static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
usb_kill_urb(port->interrupt_in_urb);
- if (port_priv)
+ if (port_priv) {
flush_work(&port_priv->lsr_work);
+ flush_work(&port_priv->interrupt_work);
+ }
return 0;
}
--
2.7.4
On Fri, Apr 19, 2019 at 10:45:31AM +0800, Ji-Ze Hong (Peter Hong) wrote:
> The F81232 will use LSR/Interrupt worker to handle LSR error & MSR
> change. This patch will fix the interrupt work should stop in close()
> and suspend().
>
> Cc: Johan Hovold <[email protected]>
> Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
> ---
> v8:
> 1: no change
>
> v7:
> 1: first introduce to this series patch.
>
> drivers/usb/serial/f81232.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index 1f0dd4087d79..25ec47d7f318 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -576,6 +576,7 @@ static void f81232_close(struct usb_serial_port *port)
> usb_serial_generic_close(port);
> usb_kill_urb(port->interrupt_in_urb);
> flush_work(&port_priv->lsr_work);
> + flush_work(&port_priv->interrupt_work);
> port_priv->is_port_open = false;
>
> mutex_unlock(&port_priv->lock);
> @@ -679,8 +680,10 @@ static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
>
> usb_kill_urb(port->interrupt_in_urb);
>
> - if (port_priv)
> + if (port_priv) {
> flush_work(&port_priv->lsr_work);
> + flush_work(&port_priv->interrupt_work);
> + }
I think this one should go before the lsr_work() patch as it's fixing
current functionality.
Johan
On Fri, Apr 19, 2019 at 10:45:30AM +0800, Ji-Ze Hong (Peter Hong) wrote:
> The F81232 will report data and LSR with bulk like following format:
> bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]...
>
> LSR will auto clear frame/parity/break error flag when reading by H/W,
> but overrrun will only cleared when reading LSR. So this patch add a
> worker to read LSR when overrun and flush the worker on close() &
> suspend().
>
> Cc: Oliver Neukum <[email protected]>
> Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
> ---
> v8:
> 1: Fix usb_submit_urb() in f81232_resume() with GFP_NOIO, not
> GFP_KERNEL.
>
> v7:
> 1: Remove serial->suspending check
> 2: Add port priv is_port_open to save port open state. We'll
> register interrupt-in urb in f81232_resume() when port is
> opened.
> 3: Using usb_kill_urb for read/interrupt urb to ensure urb
> stopped.
> drivers/usb/serial/f81232.c | 97 +++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 89 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index 0dcdcb4b2cde..1f0dd4087d79 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -41,12 +41,15 @@ MODULE_DEVICE_TABLE(usb, id_table);
> #define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
> #define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
> #define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
> +#define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS)
> #define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
>
> struct f81232_private {
> struct mutex lock;
> u8 modem_control;
> u8 modem_status;
> + bool is_port_open;
This patch can be simplified by using the tty_port_initialized() macro
in resume instead of adding a new open flag. This is the common way USB
serial drivers deal with this and will allow a lot the new locking to go
away.
> +static int f81232_resume(struct usb_serial *serial)
> +{
> + struct usb_serial_port *port = serial->port[0];
> + struct f81232_private *port_priv = usb_get_serial_port_data(port);
> + int result = 0;
> +
> + mutex_lock(&port_priv->lock);
> +
> + if (port_priv && port_priv->is_port_open) {
> + result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
> + if (result) {
> + dev_err(&port->dev,
> + "%s: submit interrupt urb failed: %d",
> + __func__, result);
Missing '\n', also please drop the function prefix.
Johan