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serial: max3100: Enable TIOCM_LOOP

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Enable or disable loopback at run-time.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240409144721.638326-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2024-04-09 17:45:48 +03:00 committed by Greg Kroah-Hartman
parent 925b2c3f6b
commit 771d22bce7
1 changed files with 14 additions and 12 deletions
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26
drivers/tty/serial/max3100.c
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@ -32,14 +32,12 @@
/**
* struct plat_max3100 - MAX3100 SPI UART platform data
* @loopback: force MAX3100 in loopback
* @crystal: 1 for 3.6864 Mhz, 0 for 1.8432
*
* You should use this structure in your machine description to specify
* how the MAX3100 is connected.
*/
struct plat_max3100 {
int loopback;
int crystal;
};
@ -109,6 +107,7 @@ struct max3100_port {
int minor; /* minor number */
int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */
int loopback_commit; /* need to change loopback */
int loopback; /* 1 if we are in loopback mode */
/* for handling irqs: need workqueue since we do spi_sync */
@ -241,9 +240,9 @@ static void max3100_work(struct work_struct *w)
struct max3100_port *s = container_of(w, struct max3100_port, work);
struct tty_port *tport = &s->port.state->port;
unsigned char ch;
int conf, cconf, cloopback, crts;
int rxchars;
u16 tx, rx;
int conf, cconf, crts;
dev_dbg(&s->spi->dev, "%s\n", __func__);
@ -253,11 +252,15 @@ static void max3100_work(struct work_struct *w)
conf = s->conf;
cconf = s->conf_commit;
s->conf_commit = 0;
cloopback = s->loopback_commit;
s->loopback_commit = 0;
crts = s->rts_commit;
s->rts_commit = 0;
spin_unlock(&s->conf_lock);
if (cconf)
max3100_sr(s, MAX3100_WC | conf, &rx);
if (cloopback)
max3100_sr(s, 0x4001, &rx);
if (crts) {
max3100_sr(s, MAX3100_WD | MAX3100_TE |
(s->rts ? MAX3100_RTS : 0), &rx);
@ -395,18 +398,24 @@ static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl)
struct max3100_port *s = container_of(port,
struct max3100_port,
port);
int rts;
int loopback, rts;
dev_dbg(&s->spi->dev, "%s\n", __func__);
loopback = (mctrl & TIOCM_LOOP) > 0;
rts = (mctrl & TIOCM_RTS) > 0;
spin_lock(&s->conf_lock);
if (s->loopback != loopback) {
s->loopback = loopback;
s->loopback_commit = 1;
}
if (s->rts != rts) {
s->rts = rts;
s->rts_commit = 1;
max3100_dowork(s);
}
if (s->loopback_commit || s->rts_commit)
max3100_dowork(s);
spin_unlock(&s->conf_lock);
}
@ -593,12 +602,6 @@ static int max3100_startup(struct uart_port *port)
return -EBUSY;
}
if (s->loopback) {
u16 tx, rx;
tx = 0x4001;
max3100_sr(s, tx, &rx);
}
s->conf_commit = 1;
max3100_dowork(s);
/* wait for clock to settle */
@ -754,7 +757,6 @@ static int max3100_probe(struct spi_device *spi)
spi_set_drvdata(spi, max3100s[i]);
pdata = dev_get_platdata(&spi->dev);
max3100s[i]->crystal = pdata->crystal;
max3100s[i]->loopback = pdata->loopback;
max3100s[i]->minor = i;
timer_setup(&max3100s[i]->timer, max3100_timeout, 0);