Input: apanel - convert to new i2c binding

Convert the apanel driver to the new i2c device driver binding model,
as the legacy model is going away soon. In the new model, the apanel
driver is no longer scanning all the i2c adapters, instead the
relevant bus driver (i2c-i801) is instantiating the device as needed.

One side benefit is that the apanel driver will now load automatically
on all systems where it is needed.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>

1 files changed, 49 insertions, 1 deletions

diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 5123eb69a971..526625eaa84b 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -64,7 +64,7 @@
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/acpi.h>
-#include <asm/io.h>
+#include <linux/io.h>
 
 /* I801 SMBus address offsets */
 #define SMBHSTSTS       (0 + i801_smba)
@@ -583,6 +583,40 @@ static struct pci_device_id i801_ids[] = {
 
 MODULE_DEVICE_TABLE (pci, i801_ids);
 
+#if defined CONFIG_INPUT_APANEL || defined CONFIG_INPUT_APANEL_MODULE
+static unsigned char apanel_addr;
+
+/* Scan the system ROM for the signature "FJKEYINF" */
+static __init const void __iomem *bios_signature(const void __iomem *bios)
+{
+        ssize_t offset;
+        const unsigned char signature[] = "FJKEYINF";
+
+        for (offset = 0; offset < 0x10000; offset += 0x10) {
+                if (check_signature(bios + offset, signature,
+                                    sizeof(signature)-1))
+                        return bios + offset;
+        }
+        return NULL;
+}
+
+static void __init input_apanel_init(void)
+{
+        void __iomem *bios;
+        const void __iomem *p;
+
+        bios = ioremap(0xF0000, 0x10000); /* Can't fail */
+        p = bios_signature(bios);
+        if (p) {
+                /* just use the first address */
+                apanel_addr = readb(p + 8 + 3) >> 1;
+        }
+        iounmap(bios);
+}
+#else
+static void __init input_apanel_init(void) {}
+#endif
+
 static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
 {
         unsigned char temp;
@@ -667,6 +701,19 @@ static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id
                 dev_err(&dev->dev, "Failed to add SMBus adapter\n");
                 goto exit_release;
         }
+
+        /* Register optional slaves */
+#if defined CONFIG_INPUT_APANEL || defined CONFIG_INPUT_APANEL_MODULE
+        if (apanel_addr) {
+                struct i2c_board_info info;
+
+                memset(&info, 0, sizeof(struct i2c_board_info));
+                info.addr = apanel_addr;
+                strlcpy(info.type, "fujitsu_apanel", I2C_NAME_SIZE);
+                i2c_new_device(&i801_adapter, &info);
+        }
+#endif
+
         return 0;
 
 exit_release:
@@ -717,6 +764,7 @@ static struct pci_driver i801_driver = {
 
 static int __init i2c_i801_init(void)
 {
+        input_apanel_init();
         return pci_register_driver(&i801_driver);
 }