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serial: max310x: Add the loopback mode support 

This patch replaces loopback mode support from platform data to
dynamic setup with TIOCMSET ioctl.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shiyan 2014-02-07 18:16:07 +04:00 committed by Greg Kroah-Hartman
parent f4fcc40b56
commit e7b8a3ceff
2 changed files with 18 additions and 8 deletions
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25
drivers/tty/serial/max310x.c
View File

@ -283,6 +283,7 @@ struct max310x_devtype {
struct max310x_one {
struct uart_port port;
struct work_struct tx_work;
struct work_struct md_work;
};
struct max310x_port {
@ -790,11 +791,21 @@ static unsigned int max310x_get_mctrl(struct uart_port *port)
return TIOCM_DSR | TIOCM_CAR;
}
static void max310x_md_proc(struct work_struct *ws)
{
struct max310x_one *one = container_of(ws, struct max310x_one, md_work);
max310x_port_update(&one->port, MAX310X_MODE2_REG,
MAX310X_MODE2_LOOPBACK_BIT,
(one->port.mctrl & TIOCM_LOOP) ?
MAX310X_MODE2_LOOPBACK_BIT : 0);
}
static void max310x_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* DCD and DSR are not wired and CTS/RTS is hadnled automatically
* so do nothing
*/
struct max310x_one *one = container_of(port, struct max310x_one, port);
schedule_work(&one->md_work);
}
static void max310x_break_ctl(struct uart_port *port, int break_state)
@ -904,8 +915,6 @@ static int max310x_startup(struct uart_port *port)
/* Configure MODE2 register */
val = MAX310X_MODE2_RXEMPTINV_BIT;
if (s->pdata->uart_flags[line] & MAX310X_LOOPBACK)
val |= MAX310X_MODE2_LOOPBACK_BIT;
if (s->pdata->uart_flags[line] & MAX310X_ECHO_SUPRESS)
val |= MAX310X_MODE2_ECHOSUPR_BIT;
@ -1176,8 +1185,7 @@ static int max310x_probe(struct device *dev, int is_spi,
s->p[i].port.irq = irq;
s->p[i].port.type = PORT_MAX310X;
s->p[i].port.fifosize = MAX310X_FIFO_SIZE;
s->p[i].port.flags = UPF_SKIP_TEST | UPF_FIXED_TYPE |
UPF_LOW_LATENCY;
s->p[i].port.flags = UPF_FIXED_TYPE | UPF_LOW_LATENCY;
s->p[i].port.iotype = UPIO_PORT;
s->p[i].port.iobase = i * 0x20;
s->p[i].port.membase = (void __iomem *)~0;
@ -1193,6 +1201,8 @@ static int max310x_probe(struct device *dev, int is_spi,
MAX310X_MODE1_IRQSEL_BIT);
/* Initialize queue for start TX */
INIT_WORK(&s->p[i].tx_work, max310x_wq_proc);
/* Initialize queue for changing mode */
INIT_WORK(&s->p[i].md_work, max310x_md_proc);
/* Register port */
uart_add_one_port(&s->uart, &s->p[i].port);
/* Go to suspend mode */
@ -1244,6 +1254,7 @@ static int max310x_remove(struct device *dev)
for (i = 0; i < s->uart.nr; i++) {
cancel_work_sync(&s->p[i].tx_work);
cancel_work_sync(&s->p[i].md_work);
uart_remove_one_port(&s->uart, &s->p[i].port);
s->devtype->power(&s->p[i].port, 0);
}

1
include/linux/platform_data/max310x.h
View File

@ -46,7 +46,6 @@ struct max310x_pdata {
#define MAX310X_EXT_CLK (0x00000001) /* External clock enable */
/* Flags global to UART port */
const u8 uart_flags[MAX310X_MAX_UARTS];
#define MAX310X_LOOPBACK (0x00000001) /* Loopback mode enable */
#define MAX310X_ECHO_SUPRESS (0x00000002) /* Enable echo supress */
#define MAX310X_AUTO_DIR_CTRL (0x00000004) /* Enable Auto direction
* control (RS-485)