diff options
Diffstat (limited to 'driver/xf86-video-radeonhd/src/rhd_acpi.c')
| -rw-r--r-- | driver/xf86-video-radeonhd/src/rhd_acpi.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/driver/xf86-video-radeonhd/src/rhd_acpi.c b/driver/xf86-video-radeonhd/src/rhd_acpi.c new file mode 100644 index 000000000..38319255c --- /dev/null +++ b/driver/xf86-video-radeonhd/src/rhd_acpi.c @@ -0,0 +1,150 @@ +/* + * Copyright 2009 Luc Verhaegen <libv@exsuse.de> + * Copyright 2009 Matthias Hopf <mhopf@novell.com> + * Copyright 2009 Egbert Eich <eich@novell.com> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#if HAVE_XF86_ANSIC_H +# include "xf86_ansic.h" +#else +# include <unistd.h> +# include <sys/types.h> +# include <dirent.h> +# include <sys/stat.h> +# include <fcntl.h> +# include <stdio.h> +# include <string.h> +# include <errno.h> +#endif + +#include "xf86.h" + +#include "rhd.h" +#include "rhd_connector.h" +#include "rhd_output.h" +#include "rhd_acpi.h" + + +#define ACPI_PATH "/sys/class/backlight" + +/* + * + */ +static Bool +rhdDoBacklight(struct rhdOutput *Output, Bool do_write, int *val) +{ + DIR *dir = opendir(ACPI_PATH); + struct dirent *dirent; + char buf[10]; + RHDFUNC(Output); + + if (!dir) + return -1; + + while ((dirent = readdir(dir)) != NULL) { + char path[PATH_MAX]; + int fd_max; + + snprintf(path,PATH_MAX,"%s/%s/max_brightness",ACPI_PATH,dirent->d_name); + if ((fd_max = open(path, O_RDONLY)) > 0) { + int max_val; + + while ((read(fd_max,buf,9) == -1) + && (errno == EINTR || errno == EAGAIN)) {}; + close (fd_max); + + if (sscanf(buf,"%i\n",&max_val) == 1) { + int fd; + + snprintf(path,PATH_MAX,"%s/%s/%s",ACPI_PATH,dirent->d_name, + do_write ? "brightness" : "actual_brightness"); + if ((fd = open(path, do_write ? O_WRONLY : O_RDONLY)) > 0) { + + if (do_write) { + + snprintf(buf,10,"%i\n",(*val * max_val) / RHD_BACKLIGHT_PROPERTY_MAX); + while ((write(fd,buf,strlen(buf)) <= 0) + && (errno == EINTR || errno == EAGAIN)) {}; + + close (fd); + closedir (dir); + RHDDebug(Output->scrnIndex,"%s: Wrote value %i to %s\n", + __func__,*val,path); + + return TRUE; + } else { + memset(buf,0,10); + + while ((read(fd,buf,9) == -1) + && (errno == EINTR || errno == EAGAIN)) {}; + + if (sscanf(buf,"%i\n",val) == 1) { + *val = (*val * RHD_BACKLIGHT_PROPERTY_MAX) / max_val; + + close(fd); + closedir(dir); + RHDDebug(Output->scrnIndex,"%s: Read value %i from %s\n", + __func__,*val,path); + + return TRUE; + } + } + close (fd); + } + } + } + } + closedir(dir); + + return FALSE; +} + +/* + * RhdACPIGetBacklightControl(): return backlight value in range 0..255; + * -1 means no ACPI BL support. + */ +int +RhdACPIGetBacklightControl(struct rhdOutput *Output) +{ +#ifdef __linux__ + int ret; + RHDFUNC(Output); + if (rhdDoBacklight(Output, FALSE, &ret)) + return ret; +#endif + return -1; +} + +/* + * + */ +void +RhdACPISetBacklightControl(struct rhdOutput *Output, int val) +{ + RHDFUNC(Output); +#ifdef __linux__ + rhdDoBacklight(Output, TRUE, &val); +#endif +} |