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Commit 4b3b49bb authored by Alan Cox's avatar Alan Cox Committed by Greg Kroah-Hartman
Browse files

tty: sdio_uart: add modem functionality 



Add the POSIX block for carrier

Linux TIOCMIWAIT functionality is still lacking from the driver.

Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent c271cf37

drivers/mmc/card/sdio_uart.c

+32 −1
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/module.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/mutex.h>

#include <linux/seq_file.h>

#include <linux/serial_reg.h>
@@ -86,6 +87,7 @@ struct sdio_uart_port { 
	struct uart_icount	icount;

	unsigned int		uartclk;

	unsigned int		mctrl;

	unsigned int		rx_mctrl;

	unsigned int		read_status_mask;

	unsigned int		ignore_status_mask;

	unsigned char		x_char;
@@ -220,6 +222,8 @@ static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port) 
	unsigned char status;

	unsigned int ret;



	/* FIXME: What stops this losing the delta bits and breaking

	   sdio_uart_check_modem_status ? */

	status = sdio_in(port, UART_MSR);



	ret = 0;
@@ -503,8 +507,20 @@ static void sdio_uart_check_modem_status(struct sdio_uart_port *port) 
		port->icount.rng++;

	if (status & UART_MSR_DDSR)

		port->icount.dsr++;

	if (status & UART_MSR_DDCD)

	if (status & UART_MSR_DDCD) {

		port->icount.dcd++;

		/* DCD raise - wake for open */

		if (status & UART_MSR_DCD)

			wake_up_interruptible(&port->port.open_wait);

		else {

			/* DCD drop - hang up if tty attached */

			tty = tty_port_tty_get(&port->port);

			if (tty) {

				tty_hangup(tty);

				tty_kref_put(tty);

			}

		}

	}

	if (status & UART_MSR_DCTS) {

		port->icount.cts++;

		tty = tty_port_tty_get(&port->port);
@@ -560,6 +576,20 @@ static void sdio_uart_irq(struct sdio_func *func) 
	port->in_sdio_uart_irq = NULL;

}



static int uart_carrier_raised(struct tty_port *tport)

{

	struct sdio_uart_port *port =

			container_of(tport, struct sdio_uart_port, port);

	unsigned int ret = sdio_uart_claim_func(port);

	if (ret)	/* Missing hardware shoudn't block for carrier */

		return 1;

	ret = sdio_uart_get_mctrl(port);

	sdio_uart_release_func(port);

	if (ret & TIOCM_CAR)

		return 1;

	return 0;

}



/**

 *	uart_dtr_rts		-	 port helper to set uart signals

 *	@tport: tty port to be updated
@@ -1044,6 +1074,7 @@ static const struct file_operations sdio_uart_proc_fops = { 


static const struct tty_port_operations sdio_uart_port_ops = {

	.dtr_rts = uart_dtr_rts,

	.carrier_raised = uart_carrier_raised,

	.shutdown = sdio_uart_shutdown,

	.activate = sdio_uart_activate,

};