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>

2 files changed, 76 insertions, 55 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);
 }
 
diff --git a/drivers/input/misc/apanel.c b/drivers/input/misc/apanel.c
index d82f7f727f7a..71b82434264d 100644
--- a/drivers/input/misc/apanel.c
+++ b/drivers/input/misc/apanel.c
@@ -57,7 +57,7 @@ static enum apanel_chip device_chip[APANEL_DEV_MAX];
 
 struct apanel {
 	struct input_polled_dev *ipdev;
-	struct i2c_client client;
+	struct i2c_client *client;
 	unsigned short keymap[MAX_PANEL_KEYS];
 	u16    nkeys;
 	u16    led_bits;
@@ -66,16 +66,7 @@ struct apanel {
 };
 
 
-static int apanel_probe(struct i2c_adapter *, int, int);
-
-/* for now, we only support one address */
-static unsigned short normal_i2c[] = {0, I2C_CLIENT_END};
-static unsigned short ignore = I2C_CLIENT_END;
-static struct i2c_client_address_data addr_data = {
-	.normal_i2c	= normal_i2c,
-	.probe		= &ignore,
-	.ignore		= &ignore,
-};
+static int apanel_probe(struct i2c_client *, const struct i2c_device_id *);
 
 static void report_key(struct input_dev *input, unsigned keycode)
 {
@@ -103,12 +94,12 @@ static void apanel_poll(struct input_polled_dev *ipdev)
 	s32 data;
 	int i;
 
-	data = i2c_smbus_read_word_data(&ap->client, cmd);
+	data = i2c_smbus_read_word_data(ap->client, cmd);
 	if (data < 0)
 		return;	/* ignore errors (due to ACPI??) */
 
 	/* write back to clear latch */
-	i2c_smbus_write_word_data(&ap->client, cmd, 0);
+	i2c_smbus_write_word_data(ap->client, cmd, 0);
 
 	if (!data)
 		return;
@@ -124,7 +115,7 @@ static void led_update(struct work_struct *work)
 {
 	struct apanel *ap = container_of(work, struct apanel, led_work);
 
-	i2c_smbus_write_word_data(&ap->client, 0x10, ap->led_bits);
+	i2c_smbus_write_word_data(ap->client, 0x10, ap->led_bits);
 }
 
 static void mail_led_set(struct led_classdev *led,
@@ -140,7 +131,7 @@ static void mail_led_set(struct led_classdev *led,
 	schedule_work(&ap->led_work);
 }
 
-static int apanel_detach_client(struct i2c_client *client)
+static int apanel_remove(struct i2c_client *client)
 {
 	struct apanel *ap = i2c_get_clientdata(client);
 
@@ -148,43 +139,33 @@ static int apanel_detach_client(struct i2c_client *client)
 		led_classdev_unregister(&ap->mail_led);
 
 	input_unregister_polled_device(ap->ipdev);
-	i2c_detach_client(&ap->client);
 	input_free_polled_device(ap->ipdev);
 
 	return 0;
 }
 
-/* Function is invoked for every i2c adapter. */
-static int apanel_attach_adapter(struct i2c_adapter *adap)
-{
-	dev_dbg(&adap->dev, APANEL ": attach adapter id=%d\n", adap->id);
-
-	/* Our device is connected only to i801 on laptop */
-	if (adap->id != I2C_HW_SMBUS_I801)
-		return -ENODEV;
-
-	return i2c_probe(adap, &addr_data, apanel_probe);
-}
-
 static void apanel_shutdown(struct i2c_client *client)
 {
-	apanel_detach_client(client);
+	apanel_remove(client);
 }
 
+static struct i2c_device_id apanel_id[] = {
+	{ "fujitsu_apanel", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, apanel_id);
+
 static struct i2c_driver apanel_driver = {
 	.driver = {
 		.name = APANEL,
 	},
-	.attach_adapter = &apanel_attach_adapter,
-	.detach_client  = &apanel_detach_client,
+	.probe		= &apanel_probe,
+	.remove		= &apanel_remove,
 	.shutdown	= &apanel_shutdown,
+	.id_table	= apanel_id,
 };
 
 static struct apanel apanel = {
-	.client = {
-		.driver = &apanel_driver,
-		.name   = APANEL,
-	},
 	.keymap = {
 		[0] = KEY_MAIL,
 		[1] = KEY_WWW,
@@ -204,7 +185,8 @@ static struct apanel apanel = {
 };
 
 /* NB: Only one panel on the i2c. */
-static int apanel_probe(struct i2c_adapter *bus, int address, int kind)
+static int apanel_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
 {
 	struct apanel *ap;
 	struct input_polled_dev *ipdev;
@@ -212,9 +194,6 @@ static int apanel_probe(struct i2c_adapter *bus, int address, int kind)
 	u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
 	int i, err = -ENOMEM;
 
-	dev_dbg(&bus->dev, APANEL ": probe adapter %p addr %d kind %d\n",
-		bus, address, kind);
-
 	ap = &apanel;
 
 	ipdev = input_allocate_polled_device();
@@ -222,18 +201,13 @@ static int apanel_probe(struct i2c_adapter *bus, int address, int kind)
 		goto out1;
 
 	ap->ipdev = ipdev;
-	ap->client.adapter = bus;
-	ap->client.addr = address;
-
-	i2c_set_clientdata(&ap->client, ap);
+	ap->client = client;
 
-	err = i2c_attach_client(&ap->client);
-	if (err)
-		goto out2;
+	i2c_set_clientdata(client, ap);
 
-	err = i2c_smbus_write_word_data(&ap->client, cmd, 0);
+	err = i2c_smbus_write_word_data(client, cmd, 0);
 	if (err) {
-		dev_warn(&ap->client.dev, APANEL ": smbus write error %d\n",
+		dev_warn(&client->dev, APANEL ": smbus write error %d\n",
 			 err);
 		goto out3;
 	}
@@ -246,7 +220,7 @@ static int apanel_probe(struct i2c_adapter *bus, int address, int kind)
 	idev->name = APANEL_NAME " buttons";
 	idev->phys = "apanel/input0";
 	idev->id.bustype = BUS_HOST;
-	idev->dev.parent = &ap->client.dev;
+	idev->dev.parent = &client->dev;
 
 	set_bit(EV_KEY, idev->evbit);
 
@@ -264,7 +238,7 @@ static int apanel_probe(struct i2c_adapter *bus, int address, int kind)
 
 	INIT_WORK(&ap->led_work, led_update);
 	if (device_chip[APANEL_DEV_LED] != CHIP_NONE) {
-		err = led_classdev_register(&ap->client.dev, &ap->mail_led);
+		err = led_classdev_register(&client->dev, &ap->mail_led);
 		if (err)
 			goto out4;
 	}
@@ -273,8 +247,6 @@ static int apanel_probe(struct i2c_adapter *bus, int address, int kind)
 out4:
 	input_unregister_polled_device(ipdev);
 out3:
-	i2c_detach_client(&ap->client);
-out2:
 	input_free_polled_device(ipdev);
 out1:
 	return err;
@@ -301,6 +273,7 @@ static int __init apanel_init(void)
 	void __iomem *bios;
 	const void __iomem *p;
 	u8 devno;
+	unsigned char i2c_addr;
 	int found = 0;
 
 	bios = ioremap(0xF0000, 0x10000); /* Can't fail */
@@ -313,7 +286,7 @@ static int __init apanel_init(void)
 
 	/* just use the first address */
 	p += 8;
-	normal_i2c[0] = readb(p+3) >> 1;
+	i2c_addr = readb(p + 3) >> 1;
 
 	for ( ; (devno = readb(p)) & 0x7f; p += 4) {
 		unsigned char method, slave, chip;
@@ -322,7 +295,7 @@ static int __init apanel_init(void)
 		chip = readb(p + 2);
 		slave = readb(p + 3) >> 1;
 
-		if (slave != normal_i2c[0]) {
+		if (slave != i2c_addr) {
 			pr_notice(APANEL ": only one SMBus slave "
 				  "address supported, skiping device...\n");
 			continue;