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Subject[PATCH 11/11] sdio_uart: add modem functionality
Date
Add the POSIX block for carrier

Linux TIOCMIWAIT functionality is still lacking from the driver.

Signed-off-by: Alan Cox <alan@linux.intel.com>
---
drivers/mmc/card/sdio_uart.c | 33 ++++++++++++++++++++++++++++++++-
1 files changed, 32 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/card/sdio_uart.c b/drivers/mmc/card/sdio_uart.c
index 0a3acfb..e72e2f2 100644
--- a/drivers/mmc/card/sdio_uart.c
+++ b/drivers/mmc/card/sdio_uart.c
@@ -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>
@@ -214,6 +216,8 @@ 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;
@@ -495,8 +499,20 @@ 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);
@@ -552,6 +568,20 @@ 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
@@ -1011,6 +1041,7 @@ 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,
};


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