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Subject[PATCH 5/6] toshiba_acpi: Don't add devices for unsupported features
Date
Test for features up-front to determine whether or not they are
supported, and avoid creating devices and proc files for
unsupported features.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
---
drivers/platform/x86/toshiba_acpi.c | 102 +++++++++++++++++++++++------------
1 files changed, 67 insertions(+), 35 deletions(-)
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index cc629e6..c51a64c 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -113,11 +113,15 @@ struct toshiba_acpi_dev {
struct input_dev *hotkey_dev;
struct backlight_device *backlight_dev;
struct led_classdev led_dev;
- int illumination_installed;
+
int force_fan;
int last_key_event;
int key_event_valid;

+ int illumination_supported:1;
+ int video_supported:1;
+ int fan_supported:1;
+
struct mutex mutex;
};

@@ -545,24 +549,31 @@ static const struct file_operations lcd_proc_fops = {
.write = lcd_proc_write,
};

+static int get_video_status(struct toshiba_acpi_dev *dev, u32 *status)
+{
+ u32 hci_result;
+
+ hci_read1(dev, HCI_VIDEO_OUT, status, &hci_result);
+ return hci_result == HCI_SUCCESS ? 0 : -EIO;
+}
+
static int video_proc_show(struct seq_file *m, void *v)
{
struct toshiba_acpi_dev *dev = m->private;
- u32 hci_result;
u32 value;
+ int ret;

- hci_read1(dev, HCI_VIDEO_OUT, &value, &hci_result);
- if (hci_result == HCI_SUCCESS) {
+ ret = get_video_status(dev, &value);
+ if (!ret) {
int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
int is_tv = (value & HCI_VIDEO_OUT_TV) ? 1 : 0;
seq_printf(m, "lcd_out: %d\n", is_lcd);
seq_printf(m, "crt_out: %d\n", is_crt);
seq_printf(m, "tv_out: %d\n", is_tv);
- return 0;
}

- return -EIO;
+ return ret;
}

static int video_proc_open(struct inode *inode, struct file *file)
@@ -575,13 +586,12 @@ static ssize_t video_proc_write(struct file *file, const char __user *buf,
{
struct toshiba_acpi_dev *dev = PDE(file->f_path.dentry->d_inode)->data;
char *cmd, *buffer;
- int ret = 0;
+ int ret;
int value;
int remain = count;
int lcd_out = -1;
int crt_out = -1;
int tv_out = -1;
- u32 hci_result;
u32 video_out;

cmd = kmalloc(count + 1, GFP_KERNEL);
@@ -616,8 +626,8 @@ static ssize_t video_proc_write(struct file *file, const char __user *buf,

kfree(cmd);

- hci_read1(dev, HCI_VIDEO_OUT, &video_out, &hci_result);
- if (hci_result == HCI_SUCCESS) {
+ ret = get_video_status(dev, &video_out);
+ if (!ret) {
unsigned int new_video_out = video_out;
if (lcd_out != -1)
_set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
@@ -629,8 +639,6 @@ static ssize_t video_proc_write(struct file *file, const char __user *buf,
* video setting if something changed. */
if (new_video_out != video_out)
ret = write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
- } else {
- ret = -EIO;
}

return ret ? ret : count;
@@ -645,20 +653,27 @@ static const struct file_operations video_proc_fops = {
.write = video_proc_write,
};

+static int get_fan_status(struct toshiba_acpi_dev *dev, u32 *status)
+{
+ u32 hci_result;
+
+ hci_read1(dev, HCI_FAN, status, &hci_result);
+ return hci_result == HCI_SUCCESS ? 0 : -EIO;
+}
+
static int fan_proc_show(struct seq_file *m, void *v)
{
struct toshiba_acpi_dev *dev = m->private;
- u32 hci_result;
+ int ret;
u32 value;

- hci_read1(dev, HCI_FAN, &value, &hci_result);
- if (hci_result == HCI_SUCCESS) {
+ ret = get_fan_status(dev, &value);
+ if (!ret) {
seq_printf(m, "running: %d\n", (value > 0));
seq_printf(m, "force_on: %d\n", dev->force_fan);
- return 0;
}

- return -EIO;
+ return ret;
}

static int fan_proc_open(struct inode *inode, struct file *file)
@@ -797,24 +812,32 @@ static const struct file_operations version_proc_fops = {
static void __devinit
create_toshiba_proc_entries(struct toshiba_acpi_dev *dev)
{
- proc_create_data("lcd", S_IRUGO | S_IWUSR, toshiba_proc_dir,
- &lcd_proc_fops, dev);
- proc_create_data("video", S_IRUGO | S_IWUSR, toshiba_proc_dir,
- &video_proc_fops, dev);
- proc_create_data("fan", S_IRUGO | S_IWUSR, toshiba_proc_dir,
- &fan_proc_fops, dev);
- proc_create_data("keys", S_IRUGO | S_IWUSR, toshiba_proc_dir,
- &keys_proc_fops, dev);
+ if (dev->backlight_dev)
+ proc_create_data("lcd", S_IRUGO | S_IWUSR, toshiba_proc_dir,
+ &lcd_proc_fops, dev);
+ if (dev->video_supported)
+ proc_create_data("video", S_IRUGO | S_IWUSR, toshiba_proc_dir,
+ &video_proc_fops, dev);
+ if (dev->fan_supported)
+ proc_create_data("fan", S_IRUGO | S_IWUSR, toshiba_proc_dir,
+ &fan_proc_fops, dev);
+ if (dev->hotkey_dev)
+ proc_create_data("keys", S_IRUGO | S_IWUSR, toshiba_proc_dir,
+ &keys_proc_fops, dev);
proc_create_data("version", S_IRUGO, toshiba_proc_dir,
&version_proc_fops, dev);
}

-static void remove_toshiba_proc_entries(void)
+static void remove_toshiba_proc_entries(struct toshiba_acpi_dev *dev)
{
- remove_proc_entry("lcd", toshiba_proc_dir);
- remove_proc_entry("video", toshiba_proc_dir);
- remove_proc_entry("fan", toshiba_proc_dir);
- remove_proc_entry("keys", toshiba_proc_dir);
+ if (dev->backlight_dev)
+ remove_proc_entry("lcd", toshiba_proc_dir);
+ if (dev->video_supported)
+ remove_proc_entry("video", toshiba_proc_dir);
+ if (dev->fan_supported)
+ remove_proc_entry("fan", toshiba_proc_dir);
+ if (dev->hotkey_dev)
+ remove_proc_entry("keys", toshiba_proc_dir);
remove_proc_entry("version", toshiba_proc_dir);
}

@@ -869,7 +892,7 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev, int type)
{
struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);

- remove_toshiba_proc_entries();
+ remove_toshiba_proc_entries(dev);

if (dev->hotkey_dev) {
input_unregister_device(dev->hotkey_dev);
@@ -884,7 +907,7 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev, int type)
if (dev->backlight_dev)
backlight_device_unregister(dev->backlight_dev);

- if (dev->illumination_installed)
+ if (dev->illumination_supported)
led_classdev_unregister(&dev->led_dev);

kfree(dev);
@@ -913,6 +936,7 @@ static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev)
struct toshiba_acpi_dev *dev;
const char *hci_method;
u32 hci_result;
+ u32 dummy;
bool bt_present;
int ret = 0;
struct backlight_properties props;
@@ -941,8 +965,6 @@ static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev)
/* enable event fifo */
hci_write1(dev, HCI_SYSTEM_EVENT, 1, &hci_result);

- create_toshiba_proc_entries(dev);
-
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
dev->backlight_dev = backlight_device_register("toshiba",
@@ -985,9 +1007,19 @@ static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev)
dev->led_dev.brightness_set = toshiba_illumination_set;
dev->led_dev.brightness_get = toshiba_illumination_get;
if (!led_classdev_register(&acpi_dev->dev, &dev->led_dev))
- dev->illumination_installed = 1;
+ dev->illumination_supported = 1;
}

+ /* Determine whether or not BIOS supports fan and video interfaces */
+
+ ret = get_video_status(dev, &dummy);
+ dev->video_supported = !ret;
+
+ ret = get_fan_status(dev, &dummy);
+ dev->fan_supported = !ret;
+
+ create_toshiba_proc_entries(dev);
+
return 0;

error:
--
1.7.4.1


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