V4L/DVB (9201): bt856: convert i2c driver for new i2c API

- Convert to use v4l2-i2c-drv-legacy.h to be able to handle the new i2c API
- Cleanups
- Use v4l_dbg/v4l_info to have uniform kernel messages
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/bt856.c

@@ -29,43 +29,24 @@
  */
 
 #include <linux/module.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/major.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/signal.h>
 #include <linux/types.h>
-#include <linux/i2c.h>
-#include <linux/video_encoder.h>
-#include <asm/io.h>
-#include <asm/pgtable.h>
-#include <asm/page.h>
+#include <linux/ioctl.h>
 #include <asm/uaccess.h>
-
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
 #include <linux/videodev.h>
+#include <linux/video_encoder.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-i2c-drv-legacy.h>
 
 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
 MODULE_AUTHOR("Mike Bernson & Dave Perks");
 MODULE_LICENSE("GPL");
 
-
-#define I2C_NAME(s) (s)->name
-
-
 static int debug;
 module_param(debug, int, 0);
 MODULE_PARM_DESC(debug, "Debug level (0-1)");
 
-#define dprintk(num, format, args...) \
-	do { \
-		if (debug >= num) \
-			printk(format, ##args); \
-	} while (0)
-
 /* ----------------------------------------------------------------------- */
 
 #define BT856_REG_OFFSET	0xDA
@@ -78,14 +59,9 @@ struct bt856 {
 	int enable;
 };
 
-#define   I2C_BT856        0x88
-
 /* ----------------------------------------------------------------------- */
 
-static inline int
-bt856_write (struct i2c_client *client,
-	     u8                 reg,
-	     u8                 value)
+static inline int bt856_write(struct i2c_client *client, u8 reg, u8 value)
 {
 	struct bt856 *encoder = i2c_get_clientdata(client);
 
@@ -93,46 +69,36 @@ bt856_write (struct i2c_client *client,
 	return i2c_smbus_write_byte_data(client, reg, value);
 }
 
-static inline int
-bt856_setbit (struct i2c_client *client,
-	      u8                 reg,
-	      u8                 bit,
-	      u8                 value)
+static inline int bt856_setbit(struct i2c_client *client, u8 reg, u8 bit, u8 value)
 {
 	struct bt856 *encoder = i2c_get_clientdata(client);
 
 	return bt856_write(client, reg,
-			   (encoder->
-			    reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
-			    (value ? (1 << bit) : 0));
+		(encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
+				(value ? (1 << bit) : 0));
 }
 
-static void
-bt856_dump (struct i2c_client *client)
+static void bt856_dump(struct i2c_client *client)
 {
 	int i;
 	struct bt856 *encoder = i2c_get_clientdata(client);
 
-	printk(KERN_INFO "%s: register dump:", I2C_NAME(client));
+	v4l_info(client, "register dump:\n");
 	for (i = 0; i < BT856_NR_REG; i += 2)
-		printk(" %02x", encoder->reg[i]);
-	printk("\n");
+		printk(KERN_CONT " %02x", encoder->reg[i]);
+	printk(KERN_CONT "\n");
 }
 
 /* ----------------------------------------------------------------------- */
 
-static int
-bt856_command (struct i2c_client *client,
-	       unsigned int       cmd,
-	       void              *arg)
+static int bt856_command(struct i2c_client *client, unsigned cmd, void *arg)
 {
 	struct bt856 *encoder = i2c_get_clientdata(client);
 
 	switch (cmd) {
-
 	case 0:
 		/* This is just for testing!!! */
-		dprintk(1, KERN_INFO "bt856: init\n");
+		v4l_dbg(1, debug, client, "init\n");
 		bt856_write(client, 0xdc, 0x18);
 		bt856_write(client, 0xda, 0);
 		bt856_write(client, 0xde, 0);
@@ -142,7 +108,6 @@ bt856_command (struct i2c_client *client,
 		bt856_setbit(client, 0xdc, 4, 1);
 
 		switch (encoder->norm) {
-
 		case VIDEO_MODE_NTSC:
 			bt856_setbit(client, 0xdc, 2, 0);
 			break;
@@ -163,26 +128,23 @@ bt856_command (struct i2c_client *client,
 	{
 		struct video_encoder_capability *cap = arg;
 
-		dprintk(1, KERN_INFO "%s: get capabilities\n",
-			I2C_NAME(client));
+		v4l_dbg(1, debug, client, "get capabilities\n");
 
 		cap->flags = VIDEO_ENCODER_PAL |
 			     VIDEO_ENCODER_NTSC |
 			     VIDEO_ENCODER_CCIR;
 		cap->inputs = 2;
 		cap->outputs = 1;
-	}
 		break;
+	}
 
 	case ENCODER_SET_NORM:
 	{
 		int *iarg = arg;
 
-		dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client),
-			*iarg);
+		v4l_dbg(1, debug, client, "set norm %d\n", *iarg);
 
 		switch (*iarg) {
-
 		case VIDEO_MODE_NTSC:
 			bt856_setbit(client, 0xdc, 2, 0);
 			break;
@@ -195,27 +157,23 @@ bt856_command (struct i2c_client *client,
 
 		default:
 			return -EINVAL;
-
 		}
 		encoder->norm = *iarg;
 		if (debug != 0)
 			bt856_dump(client);
-	}
 		break;
+	}
 
 	case ENCODER_SET_INPUT:
 	{
 		int *iarg = arg;
 
-		dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client),
-			*iarg);
+		v4l_dbg(1, debug, client, "set input %d\n", *iarg);
 
 		/* We only have video bus.
 		 * iarg = 0: input is from bt819
 		 * iarg = 1: input is from ZR36060 */
-
 		switch (*iarg) {
-
 		case 0:
 			bt856_setbit(client, 0xde, 4, 0);
 			bt856_setbit(client, 0xde, 3, 1);
@@ -234,27 +192,24 @@ bt856_command (struct i2c_client *client,
 			break;
 		default:
 			return -EINVAL;
-
 		}
 
 		if (debug != 0)
 			bt856_dump(client);
-	}
 		break;
+	}
 
 	case ENCODER_SET_OUTPUT:
 	{
 		int *iarg = arg;
 
-		dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client),
-			*iarg);
+		v4l_dbg(1, debug, client, "set output %d\n", *iarg);
 
 		/* not much choice of outputs */
-		if (*iarg != 0) {
+		if (*iarg != 0)
 			return -EINVAL;
-		}
-	}
 		break;
+	}
 
 	case ENCODER_ENABLE_OUTPUT:
 	{
@@ -262,10 +217,9 @@ bt856_command (struct i2c_client *client,
 
 		encoder->enable = !!*iarg;
 
-		dprintk(1, KERN_INFO "%s: enable output %d\n",
-			I2C_NAME(client), encoder->enable);
-	}
+		v4l_dbg(1, debug, client, "enable output %d\n", encoder->enable);
 		break;
+	}
 
 	default:
 		return -EINVAL;
@@ -276,64 +230,29 @@ bt856_command (struct i2c_client *client,
 
 /* ----------------------------------------------------------------------- */
 
-/*
- * Generic i2c probe
- * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
- */
-static unsigned short normal_i2c[] = { I2C_BT856 >> 1, 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 unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };
 
-static struct i2c_driver i2c_driver_bt856;
+I2C_CLIENT_INSMOD;
 
-static int
-bt856_detect_client (struct i2c_adapter *adapter,
-		     int                 address,
-		     int                 kind)
+static int bt856_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
 {
-	int i;
-	struct i2c_client *client;
 	struct bt856 *encoder;
 
-	dprintk(1,
-		KERN_INFO
-		"bt856.c: detecting bt856 client on address 0x%x\n",
-		address << 1);
-
 	/* Check if the adapter supports the needed features */
-	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-		return 0;
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
 
-	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
-	if (!client)
-		return -ENOMEM;
-	client->addr = address;
-	client->adapter = adapter;
-	client->driver = &i2c_driver_bt856;
-	strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client)));
+	v4l_info(client, "chip found @ 0x%x (%s)\n",
+			client->addr << 1, client->adapter->name);
 
 	encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
-	if (encoder == NULL) {
-		kfree(client);
+	if (encoder == NULL)
 		return -ENOMEM;
-	}
 	encoder->norm = VIDEO_MODE_NTSC;
 	encoder->enable = 1;
 	i2c_set_clientdata(client, encoder);
 
-	i = i2c_attach_client(client);
-	if (i) {
-		kfree(client);
-		kfree(encoder);
-		return i;
-	}
-
 	bt856_write(client, 0xdc, 0x18);
 	bt856_write(client, 0xda, 0);
 	bt856_write(client, 0xde, 0);
@@ -359,65 +278,26 @@ bt856_detect_client (struct i2c_adapter *adapter,
 
 	if (debug != 0)
 		bt856_dump(client);
-
-	dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client),
-		client->addr << 1);
-
 	return 0;
 }
 
-static int
-bt856_attach_adapter (struct i2c_adapter *adapter)
+static int bt856_remove(struct i2c_client *client)
 {
-	dprintk(1,
-		KERN_INFO
-		"bt856.c: starting probe for adapter %s (0x%x)\n",
-		I2C_NAME(adapter), adapter->id);
-	return i2c_probe(adapter, &addr_data, &bt856_detect_client);
-}
-
-static int
-bt856_detach_client (struct i2c_client *client)
-{
-	struct bt856 *encoder = i2c_get_clientdata(client);
-	int err;
-
-	err = i2c_detach_client(client);
-	if (err) {
-		return err;
-	}
-
-	kfree(encoder);
-	kfree(client);
-
+	kfree(i2c_get_clientdata(client));
 	return 0;
 }
 
-/* ----------------------------------------------------------------------- */
-
-static struct i2c_driver i2c_driver_bt856 = {
-	.driver = {
-		.name = "bt856",
-	},
-
-	.id = I2C_DRIVERID_BT856,
+static const struct i2c_device_id bt856_id[] = {
+	{ "bt856", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, bt856_id);
 
-	.attach_adapter = bt856_attach_adapter,
-	.detach_client = bt856_detach_client,
+static struct v4l2_i2c_driver_data v4l2_i2c_data = {
+	.name = "bt856",
+	.driverid = I2C_DRIVERID_BT856,
 	.command = bt856_command,
+	.probe = bt856_probe,
+	.remove = bt856_remove,
+	.id_table = bt856_id,
 };
-
-static int __init
-bt856_init (void)
-{
-	return i2c_add_driver(&i2c_driver_bt856);
-}
-
-static void __exit
-bt856_exit (void)
-{
-	i2c_del_driver(&i2c_driver_bt856);
-}
-
-module_init(bt856_init);
-module_exit(bt856_exit);