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console: Introduce console_start() and console_stop()
In the future we would like to stop unused consoles and also add a reference counting to avoid imbalanced calls to ->start() and ->stop() in some cases. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Simon Glass <sjg@chromium.org>
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parent
a17b38ce39
commit
41f668b97c
2 changed files with 26 additions and 7 deletions
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@ -172,13 +172,9 @@ static int console_setfile(int file, struct stdio_dev * dev)
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case stdin:
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case stdout:
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case stderr:
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/* Start new device */
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if (dev->start) {
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error = dev->start(dev);
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/* If it's not started dont use it */
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if (error < 0)
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break;
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}
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error = console_start(file, dev);
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if (error)
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break;
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/* Assign the new device (leaving the existing one started) */
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stdio_devices[file] = dev;
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@ -389,6 +385,26 @@ static inline void console_doenv(int file, struct stdio_dev *dev)
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#endif
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#endif /* CONIFIG_IS_ENABLED(CONSOLE_MUX) */
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int console_start(int file, struct stdio_dev *sdev)
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{
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int error;
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/* Start new device */
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if (sdev->start) {
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error = sdev->start(sdev);
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/* If it's not started don't use it */
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if (error < 0)
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return error;
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}
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return 0;
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}
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void console_stop(int file, struct stdio_dev *sdev)
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{
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if (sdev->stop)
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sdev->stop(sdev);
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}
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/** U-Boot INITIAL CONSOLE-NOT COMPATIBLE FUNCTIONS *************************/
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int serial_printf(const char *fmt, ...)
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@ -8,6 +8,7 @@
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#define __CONSOLE_H
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#include <stdbool.h>
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#include <stdio_dev.h>
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#include <linux/errno.h>
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extern char console_buffer[];
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@ -15,6 +16,8 @@ extern char console_buffer[];
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/* common/console.c */
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int console_init_f(void); /* Before relocation; uses the serial stuff */
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int console_init_r(void); /* After relocation; uses the console stuff */
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int console_start(int file, struct stdio_dev *sdev); /* Start a console device */
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void console_stop(int file, struct stdio_dev *sdev); /* Stop a console device */
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int console_assign(int file, const char *devname); /* Assign the console */
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int ctrlc(void);
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int had_ctrlc(void); /* have we had a Control-C since last clear? */
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