diff options
| author |   Yegor Yefremov <yegorslists@googlemail.com> | 2016-05-31 10:59:16 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-25 14:30:42 -0700 |
| commit | bf5cee681e57babde5358a71e59b75151eb02c1a (patch) | |
| tree | 90642ffa447c90c08f2f3719825b21d4c9a2572d /drivers/tty/serial/serial_mctrl_gpio.c | |
| parent | tty/serial/8250: make UART_MCR register access consistent (diff) | |
| download | linux-dev-bf5cee681e57babde5358a71e59b75151eb02c1a.tar.xz linux-dev-bf5cee681e57babde5358a71e59b75151eb02c1a.zip | |
serial: mctrl_gpio: add modem control read routine
mctrl_gpio_get_outputs() returns the state of following signals:
RTS, DTR
While defining the routine for reading outputs, fix the comment for
mctrl_gpio_get() routine as it returns only the state of the input
signals.
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/serial_mctrl_gpio.c')
| -rw-r--r-- | drivers/tty/serial/serial_mctrl_gpio.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index e8dd5097dc56..a868595beab0 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -86,6 +86,24 @@ unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl) } EXPORT_SYMBOL_GPL(mctrl_gpio_get); +unsigned int +mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl) +{ + enum mctrl_gpio_idx i; + + for (i = 0; i < UART_GPIO_MAX; i++) { + if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) { + if (gpiod_get_value(gpios->gpio[i])) + *mctrl |= mctrl_gpios_desc[i].mctrl; + else + *mctrl &= ~mctrl_gpios_desc[i].mctrl; + } + } + + return *mctrl; +} +EXPORT_SYMBOL_GPL(mctrl_gpio_get_outputs); + struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx) { struct mctrl_gpios *gpios; |