diff options
| author | Alan Cox <alan@linux.intel.com> | 2009-11-30 13:16:36 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-11 15:18:06 -0800 |
| commit | 4b3b49bb77eddb540e7c69e2129f5334cf713bf8 (patch) | |
| tree | 415490efdbd059d1e2c7b43546361215697dd55d /drivers/mmc | |
| parent | c271cf37ba17631e371c97e2e8c8c353a83793e2 (diff) | |
| download | linux-4b3b49bb77eddb540e7c69e2129f5334cf713bf8.tar.gz linux-4b3b49bb77eddb540e7c69e2129f5334cf713bf8.tar.xz | |
tty: sdio_uart: add modem functionality
Add the POSIX block for carrier
Linux TIOCMIWAIT functionality is still lacking from the driver.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | 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 b999972eaf28..2a13db54ffc4 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> @@ -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, }; |