diff options
Diffstat (limited to 'drivers/misc/thinkpad_acpi.c')
| -rw-r--r-- | drivers/misc/thinkpad_acpi.c | 91 |
1 files changed, 81 insertions, 10 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c index 63b1e2610c6..322ba25b479 100644 --- a/drivers/misc/thinkpad_acpi.c +++ b/drivers/misc/thinkpad_acpi.c @@ -3114,6 +3114,66 @@ static struct backlight_ops ibm_backlight_data = { static struct mutex brightness_mutex; +static int __init tpacpi_query_bcll_levels(acpi_handle handle) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + int rc; + + if (ACPI_SUCCESS(acpi_evaluate_object(handle, NULL, NULL, &buffer))) { + obj = (union acpi_object *)buffer.pointer; + if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { + printk(IBM_ERR "Unknown BCLL data, " + "please report this to %s\n", IBM_MAIL); + rc = 0; + } else { + rc = obj->package.count; + } + } else { + return 0; + } + + kfree(buffer.pointer); + return rc; +} + +static acpi_status __init brightness_find_bcll(acpi_handle handle, u32 lvl, + void *context, void **rv) +{ + char name[ACPI_PATH_SEGMENT_LENGTH]; + struct acpi_buffer buffer = { sizeof(name), &name }; + + if (ACPI_SUCCESS(acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer)) && + !strncmp("BCLL", name, sizeof(name) - 1)) { + if (tpacpi_query_bcll_levels(handle) == 16) { + *rv = handle; + return AE_CTRL_TERMINATE; + } else { + return AE_OK; + } + } else { + return AE_OK; + } +} + +static int __init brightness_check_levels(void) +{ + int status; + void *found_node = NULL; + + if (!vid_handle) { + IBM_ACPIHANDLE_INIT(vid); + } + if (!vid_handle) + return 0; + + /* Search for a BCLL package with 16 levels */ + status = acpi_walk_namespace(ACPI_TYPE_PACKAGE, vid_handle, 3, + brightness_find_bcll, NULL, &found_node); + + return (ACPI_SUCCESS(status) && found_node != NULL); +} + static int __init brightness_init(struct ibm_init_struct *iibm) { int b; @@ -3135,10 +3195,17 @@ static int __init brightness_init(struct ibm_init_struct *iibm) if (brightness_mode > 3) return -EINVAL; + tp_features.bright_16levels = + thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO && + brightness_check_levels(); + b = brightness_get(NULL); if (b < 0) return 1; + if (tp_features.bright_16levels) + printk(IBM_INFO "detected a 16-level brightness capable ThinkPad\n"); + ibm_backlight_device = backlight_device_register( TPACPI_BACKLIGHT_DEV_NAME, NULL, NULL, &ibm_backlight_data); @@ -3148,7 +3215,8 @@ static int __init brightness_init(struct ibm_init_struct *iibm) } vdbg_printk(TPACPI_DBG_INIT, "brightness is supported\n"); - ibm_backlight_device->props.max_brightness = 7; + ibm_backlight_device->props.max_brightness = + (tp_features.bright_16levels)? 15 : 7; ibm_backlight_device->props.brightness = b; backlight_update_status(ibm_backlight_device); @@ -3184,13 +3252,14 @@ static int brightness_get(struct backlight_device *bd) if (brightness_mode & 1) { if (!acpi_ec_read(brightness_offset, &lec)) return -EIO; - lec &= 7; + lec &= (tp_features.bright_16levels)? 0x0f : 0x07; level = lec; }; if (brightness_mode & 2) { lcmos = (nvram_read_byte(TP_NVRAM_ADDR_BRIGHTNESS) & TP_NVRAM_MASK_LEVEL_BRIGHTNESS) >> TP_NVRAM_POS_LEVEL_BRIGHTNESS; + lcmos &= (tp_features.bright_16levels)? 0x0f : 0x07; level = lcmos; } @@ -3211,7 +3280,7 @@ static int brightness_set(int value) int cmos_cmd, inc, i, res; int current_value; - if (value > 7) + if (value > ((tp_features.bright_16levels)? 15 : 7)) return -EINVAL; res = mutex_lock_interruptible(&brightness_mutex); @@ -3227,7 +3296,7 @@ static int brightness_set(int value) cmos_cmd = value > current_value ? TP_CMOS_BRIGHTNESS_UP : TP_CMOS_BRIGHTNESS_DOWN; - inc = value > current_value ? 1 : -1; + inc = (value > current_value)? 1 : -1; res = 0; for (i = current_value; i != value; i += inc) { @@ -3256,10 +3325,11 @@ static int brightness_read(char *p) if ((level = brightness_get(NULL)) < 0) { len += sprintf(p + len, "level:\t\tunreadable\n"); } else { - len += sprintf(p + len, "level:\t\t%d\n", level & 0x7); + len += sprintf(p + len, "level:\t\t%d\n", level); len += sprintf(p + len, "commands:\tup, down\n"); len += sprintf(p + len, "commands:\tlevel <level>" - " (<level> is 0-7)\n"); + " (<level> is 0-%d)\n", + (tp_features.bright_16levels) ? 15 : 7); } return len; @@ -3270,18 +3340,19 @@ static int brightness_write(char *buf) int level; int new_level; char *cmd; + int max_level = (tp_features.bright_16levels) ? 15 : 7; while ((cmd = next_cmd(&buf))) { if ((level = brightness_get(NULL)) < 0) return level; - level &= 7; if (strlencmp(cmd, "up") == 0) { - new_level = level == 7 ? 7 : level + 1; + new_level = level == (max_level)? + max_level : level + 1; } else if (strlencmp(cmd, "down") == 0) { - new_level = level == 0 ? 0 : level - 1; + new_level = level == 0? 0 : level - 1; } else if (sscanf(cmd, "level %d", &new_level) == 1 && - new_level >= 0 && new_level <= 7) { + new_level >= 0 && new_level <= max_level) { /* new_level set */ } else return -EINVAL; |