sony-laptop: sonypi backward compatibility code

Compatibility code to allow old sonypi bound userspace apps to still work.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 329 insertions, 3 deletions

diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index 9042184d543..8cc041182a1 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -62,6 +62,10 @@
 #include <acpi/acpi_bus.h>
 #include <asm/uaccess.h>
 #include <linux/sonypi.h>
+#ifdef CONFIG_SONY_LAPTOP_OLD
+#include <linux/poll.h>
+#include <linux/miscdevice.h>
+#endif
 
 #define DRV_PFX                 "sony-laptop: "
 #define dprintk(msg...)         do {                    \
@@ -96,13 +100,21 @@ MODULE_PARM_DESC(no_spic,
 static int compat;              /* = 0 */
 module_param(compat, int, 0444);
 MODULE_PARM_DESC(compat,
-                 "set this if you want to enable backward compatibility mode for SPIC");
+                 "set this if you want to enable backward compatibility mode");
 
 static unsigned long mask = 0xffffffff;
 module_param(mask, ulong, 0644);
 MODULE_PARM_DESC(mask,
                  "set this to the mask of event you want to enable (see doc)");
 
+#ifdef CONFIG_SONY_LAPTOP_OLD
+static int minor = -1;
+module_param(minor, int, 0);
+MODULE_PARM_DESC(minor,
+                 "minor number of the misc device for the SPIC compatibility code, "
+                 "default is -1 (automatic)");
+#endif
+
 /*********** Input Devices ***********/
 
 #define SONY_LAPTOP_BUF_SIZE    128
@@ -1318,6 +1330,16 @@ static ssize_t sony_pic_bluetoothpower_show(struct device *dev,
 /* fan speed */
 /* FAN0 information (reverse engineered from ACPI tables) */
 #define SONY_PIC_FAN0_STATUS    0x93
+static int sony_pic_set_fanspeed(unsigned long value)
+{
+        return ec_write(SONY_PIC_FAN0_STATUS, value);
+}
+
+static int sony_pic_get_fanspeed(u8 *value)
+{
+        return ec_read(SONY_PIC_FAN0_STATUS, value);
+}
+
 static ssize_t sony_pic_fanspeed_store(struct device *dev,
                 struct device_attribute *attr,
                 const char *buffer, size_t count)
@@ -1327,7 +1349,7 @@ static ssize_t sony_pic_fanspeed_store(struct device *dev,
                 return -EINVAL;
 
         value = simple_strtoul(buffer, NULL, 10);
-        if (ec_write(SONY_PIC_FAN0_STATUS, value))
+        if (sony_pic_set_fanspeed(value))
                 return -EIO;
 
         return count;
@@ -1337,7 +1359,7 @@ static ssize_t sony_pic_fanspeed_show(struct device *dev,
                 struct device_attribute *attr, char *buffer)
 {
         u8 value = 0;
-        if (ec_read(SONY_PIC_FAN0_STATUS, &value))
+        if (sony_pic_get_fanspeed(&value))
                 return -EIO;
 
         return snprintf(buffer, PAGE_SIZE, "%d\n", value);
@@ -1363,6 +1385,304 @@ static struct attribute_group spic_attribute_group = {
         .attrs = spic_attributes
 };
 
+/******** SONYPI compatibility **********/
+#ifdef CONFIG_SONY_LAPTOP_OLD
+
+/* battery / brightness / temperature  addresses */
+#define SONYPI_BAT_FLAGS        0x81
+#define SONYPI_LCD_LIGHT        0x96
+#define SONYPI_BAT1_PCTRM       0xa0
+#define SONYPI_BAT1_LEFT        0xa2
+#define SONYPI_BAT1_MAXRT       0xa4
+#define SONYPI_BAT2_PCTRM       0xa8
+#define SONYPI_BAT2_LEFT        0xaa
+#define SONYPI_BAT2_MAXRT       0xac
+#define SONYPI_BAT1_MAXTK       0xb0
+#define SONYPI_BAT1_FULL        0xb2
+#define SONYPI_BAT2_MAXTK       0xb8
+#define SONYPI_BAT2_FULL        0xba
+#define SONYPI_TEMP_STATUS      0xC1
+
+struct sonypi_compat_s {
+        struct fasync_struct    *fifo_async;
+        struct kfifo            *fifo;
+        spinlock_t              fifo_lock;
+        wait_queue_head_t       fifo_proc_list;
+        atomic_t                open_count;
+};
+static struct sonypi_compat_s sonypi_compat = {
+        .open_count = ATOMIC_INIT(0),
+};
+
+static int sonypi_misc_fasync(int fd, struct file *filp, int on)
+{
+        int retval;
+
+        retval = fasync_helper(fd, filp, on, &sonypi_compat.fifo_async);
+        if (retval < 0)
+                return retval;
+        return 0;
+}
+
+static int sonypi_misc_release(struct inode *inode, struct file *file)
+{
+        sonypi_misc_fasync(-1, file, 0);
+        atomic_dec(&sonypi_compat.open_count);
+        return 0;
+}
+
+static int sonypi_misc_open(struct inode *inode, struct file *file)
+{
+        /* Flush input queue on first open */
+        if (atomic_inc_return(&sonypi_compat.open_count) == 1)
+                kfifo_reset(sonypi_compat.fifo);
+        return 0;
+}
+
+static ssize_t sonypi_misc_read(struct file *file, char __user *buf,
+                                size_t count, loff_t *pos)
+{
+        ssize_t ret;
+        unsigned char c;
+
+        if ((kfifo_len(sonypi_compat.fifo) == 0) &&
+            (file->f_flags & O_NONBLOCK))
+                return -EAGAIN;
+
+        ret = wait_event_interruptible(sonypi_compat.fifo_proc_list,
+                                       kfifo_len(sonypi_compat.fifo) != 0);
+        if (ret)
+                return ret;
+
+        while (ret < count &&
+               (kfifo_get(sonypi_compat.fifo, &c, sizeof(c)) == sizeof(c))) {
+                if (put_user(c, buf++))
+                        return -EFAULT;
+                ret++;
+        }
+
+        if (ret > 0) {
+                struct inode *inode = file->f_path.dentry->d_inode;
+                inode->i_atime = current_fs_time(inode->i_sb);
+        }
+
+        return ret;
+}
+
+static unsigned int sonypi_misc_poll(struct file *file, poll_table *wait)
+{
+        poll_wait(file, &sonypi_compat.fifo_proc_list, wait);
+        if (kfifo_len(sonypi_compat.fifo))
+                return POLLIN | POLLRDNORM;
+        return 0;
+}
+
+static int ec_read16(u8 addr, u16 *value)
+{
+        u8 val_lb, val_hb;
+        if (ec_read(addr, &val_lb))
+                return -1;
+        if (ec_read(addr + 1, &val_hb))
+                return -1;
+        *value = val_lb | (val_hb << 8);
+        return 0;
+}
+
+static int sonypi_misc_ioctl(struct inode *ip, struct file *fp,
+                             unsigned int cmd, unsigned long arg)
+{
+        int ret = 0;
+        void __user *argp = (void __user *)arg;
+        u8 val8;
+        u16 val16;
+        int value;
+
+        /*down(&sonypi_device.lock);*/
+        switch (cmd) {
+        case SONYPI_IOCGBRT:
+                if (sony_backlight_device == NULL) {
+                        ret = -EIO;
+                        break;
+                }
+                if (acpi_callgetfunc(sony_nc_acpi_handle, "GBRT", &value)) {
+                        ret = -EIO;
+                        break;
+                }
+                val8 = ((value & 0xff) - 1) << 5;
+                if (copy_to_user(argp, &val8, sizeof(val8)))
+                                ret = -EFAULT;
+                break;
+        case SONYPI_IOCSBRT:
+                if (sony_backlight_device == NULL) {
+                        ret = -EIO;
+                        break;
+                }
+                if (copy_from_user(&val8, argp, sizeof(val8))) {
+                        ret = -EFAULT;
+                        break;
+                }
+                if (acpi_callsetfunc(sony_nc_acpi_handle, "SBRT",
+                                (val8 >> 5) + 1, NULL)) {
+                        ret = -EIO;
+                        break;
+                }
+                /* sync the backlight device status */
+                sony_backlight_device->props.brightness =
+                    sony_backlight_get_brightness(sony_backlight_device);
+                break;
+        case SONYPI_IOCGBAT1CAP:
+                if (ec_read16(SONYPI_BAT1_FULL, &val16)) {
+                        ret = -EIO;
+                        break;
+                }
+                if (copy_to_user(argp, &val16, sizeof(val16)))
+                        ret = -EFAULT;
+                break;
+        case SONYPI_IOCGBAT1REM:
+                if (ec_read16(SONYPI_BAT1_LEFT, &val16)) {
+                        ret = -EIO;
+                        break;
+                }
+                if (copy_to_user(argp, &val16, sizeof(val16)))
+                        ret = -EFAULT;
+                break;
+        case SONYPI_IOCGBAT2CAP:
+                if (ec_read16(SONYPI_BAT2_FULL, &val16)) {
+                        ret = -EIO;
+                        break;
+                }
+                if (copy_to_user(argp, &val16, sizeof(val16)))
+                        ret = -EFAULT;
+                break;
+        case SONYPI_IOCGBAT2REM:
+                if (ec_read16(SONYPI_BAT2_LEFT, &val16)) {
+                        ret = -EIO;
+                        break;
+                }
+                if (copy_to_user(argp, &val16, sizeof(val16)))
+                        ret = -EFAULT;
+                break;
+        case SONYPI_IOCGBATFLAGS:
+                if (ec_read(SONYPI_BAT_FLAGS, &val8)) {
+                        ret = -EIO;
+                        break;
+                }
+                val8 &= 0x07;
+                if (copy_to_user(argp, &val8, sizeof(val8)))
+                        ret = -EFAULT;
+                break;
+        case SONYPI_IOCGBLUE:
+                val8 = spic_dev.bluetooth_power;
+                if (copy_to_user(argp, &val8, sizeof(val8)))
+                        ret = -EFAULT;
+                break;
+        case SONYPI_IOCSBLUE:
+                if (copy_from_user(&val8, argp, sizeof(val8))) {
+                        ret = -EFAULT;
+                        break;
+                }
+                sony_pic_set_bluetoothpower(val8);
+                break;
+        /* FAN Controls */
+        case SONYPI_IOCGFAN:
+                if (sony_pic_get_fanspeed(&val8)) {
+                        ret = -EIO;
+                        break;
+                }
+                if (copy_to_user(argp, &val8, sizeof(val8)))
+                        ret = -EFAULT;
+                break;
+        case SONYPI_IOCSFAN:
+                if (copy_from_user(&val8, argp, sizeof(val8))) {
+                        ret = -EFAULT;
+                        break;
+                }
+                if (sony_pic_set_fanspeed(val8))
+                        ret = -EIO;
+                break;
+        /* GET Temperature (useful under APM) */
+        case SONYPI_IOCGTEMP:
+                if (ec_read(SONYPI_TEMP_STATUS, &val8)) {
+                        ret = -EIO;
+                        break;
+                }
+                if (copy_to_user(argp, &val8, sizeof(val8)))
+                        ret = -EFAULT;
+                break;
+        default:
+                ret = -EINVAL;
+        }
+        /*up(&sonypi_device.lock);*/
+        return ret;
+}
+
+static const struct file_operations sonypi_misc_fops = {
+        .owner          = THIS_MODULE,
+        .read           = sonypi_misc_read,
+        .poll           = sonypi_misc_poll,
+        .open           = sonypi_misc_open,
+        .release        = sonypi_misc_release,
+        .fasync         = sonypi_misc_fasync,
+        .ioctl          = sonypi_misc_ioctl,
+};
+
+static struct miscdevice sonypi_misc_device = {
+        .minor          = MISC_DYNAMIC_MINOR,
+        .name           = "sonypi",
+        .fops           = &sonypi_misc_fops,
+};
+
+static void sonypi_compat_report_event(u8 event)
+{
+        kfifo_put(sonypi_compat.fifo, (unsigned char *)&event, sizeof(event));
+        kill_fasync(&sonypi_compat.fifo_async, SIGIO, POLL_IN);
+        wake_up_interruptible(&sonypi_compat.fifo_proc_list);
+}
+
+static int sonypi_compat_init(void)
+{
+        int error;
+
+        spin_lock_init(&sonypi_compat.fifo_lock);
+        sonypi_compat.fifo = kfifo_alloc(SONY_LAPTOP_BUF_SIZE, GFP_KERNEL,
+                                         &sonypi_compat.fifo_lock);
+        if (IS_ERR(sonypi_compat.fifo)) {
+                printk(KERN_ERR DRV_PFX "kfifo_alloc failed\n");
+                return PTR_ERR(sonypi_compat.fifo);
+        }
+
+        init_waitqueue_head(&sonypi_compat.fifo_proc_list);
+        /*init_MUTEX(&sonypi_device.lock);*/
+
+        if (minor != -1)
+                sonypi_misc_device.minor = minor;
+        error = misc_register(&sonypi_misc_device);
+        if (error) {
+                printk(KERN_ERR DRV_PFX "misc_register failed\n");
+                goto err_free_kfifo;
+        }
+        if (minor == -1)
+                printk(KERN_INFO "sonypi: device allocated minor is %d\n",
+                       sonypi_misc_device.minor);
+
+        return 0;
+
+err_free_kfifo:
+        kfifo_free(sonypi_compat.fifo);
+        return error;
+}
+
+static void sonypi_compat_exit(void)
+{
+        misc_deregister(&sonypi_misc_device);
+        kfifo_free(sonypi_compat.fifo);
+}
+#else
+static int sonypi_compat_init(void) { return 0; }
+static void sonypi_compat_exit(void) { }
+static void sonypi_compat_report_event(u8 event) { }
+#endif /* CONFIG_SONY_LAPTOP_OLD */
+
 /*
  * ACPI callbacks
  */
@@ -1604,6 +1924,7 @@ static irqreturn_t sony_pic_irq(int irq, void *dev_id)
 found:
         sony_laptop_report_input_event(device_event);
         acpi_bus_generate_event(spic_dev.acpi_dev, 1, device_event);
+        sonypi_compat_report_event(device_event);
 
         return IRQ_HANDLED;
 }
@@ -1618,6 +1939,8 @@ static int sony_pic_remove(struct acpi_device *device, int type)
         struct sony_pic_ioport *io, *tmp_io;
         struct sony_pic_irq *irq, *tmp_irq;
 
+        sonypi_compat_exit();
+
         if (sony_pic_disable(device)) {
                 printk(KERN_ERR DRV_PFX "Couldn't disable device.\n");
                 return -ENXIO;
@@ -1731,6 +2054,9 @@ static int sony_pic_add(struct acpi_device *device)
         if (result)
                 goto err_remove_pf;
 
+        if (sonypi_compat_init())
+                goto err_remove_pf;
+
         return 0;
 
 err_remove_pf: