media: tegra: Tegra V4L2 camera
[linux-2.6.git] / drivers / media / video / tda9840.c
index ef494fe..22fa820 100644 (file)
@@ -2,6 +2,7 @@
     tda9840 - i2c-driver for the tda9840 by SGS Thomson
 
     Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+    Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
 
     The tda9840 is a stereo/dual sound processor with digital
     identification. It can be found at address 0x84 on the i2c-bus.
 
 #include <linux/module.h>
 #include <linux/ioctl.h>
+#include <linux/slab.h>
 #include <linux/i2c.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
 
-#include "tda9840.h"
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("tda9840 driver");
+MODULE_LICENSE("GPL");
 
-static int debug = 0;          /* insmod parameter */
+static int debug;
 module_param(debug, int, 0644);
-MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off).");
-#define dprintk(args...) \
-           do { if (debug) { printk("%s: %s()[%d]: ", KBUILD_MODNAME, __FUNCTION__, __LINE__); printk(args); } } while (0)
+
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
 
 #define        SWITCH          0x00
 #define        LEVEL_ADJUST    0x02
 #define        STEREO_ADJUST   0x03
 #define        TEST            0x04
 
-/* addresses to scan, found only at 0x42 (7-Bit) */
-static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END };
+#define TDA9840_SET_MUTE                0x00
+#define TDA9840_SET_MONO                0x10
+#define TDA9840_SET_STEREO              0x2a
+#define TDA9840_SET_LANG1               0x12
+#define TDA9840_SET_LANG2               0x1e
+#define TDA9840_SET_BOTH                0x1a
+#define TDA9840_SET_BOTH_R              0x16
+#define TDA9840_SET_EXTERNAL            0x7a
 
-/* magic definition of all other variables and things */
-I2C_CLIENT_INSMOD;
 
-static struct i2c_driver driver;
-static struct i2c_client client_template;
-
-static int command(struct i2c_client *client, unsigned int cmd, void *arg)
+static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
 {
-       int result;
-       int byte = *(int *)arg;
-
-       switch (cmd) {
-       case TDA9840_SWITCH:
-
-               dprintk("TDA9840_SWITCH: 0x%02x\n", byte);
-
-               if (byte != TDA9840_SET_MONO
-                   && byte != TDA9840_SET_MUTE
-                   && byte != TDA9840_SET_STEREO
-                   && byte != TDA9840_SET_LANG1
-                   && byte != TDA9840_SET_LANG2
-                   && byte != TDA9840_SET_BOTH
-                   && byte != TDA9840_SET_BOTH_R
-                   && byte != TDA9840_SET_EXTERNAL) {
-                       return -EINVAL;
-               }
-
-               result = i2c_smbus_write_byte_data(client, SWITCH, byte);
-               if (result)
-                       dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
-               break;
+       struct i2c_client *client = v4l2_get_subdevdata(sd);
 
-       case TDA9840_LEVEL_ADJUST:
-
-               dprintk("TDA9840_LEVEL_ADJUST: %d\n", byte);
+       if (i2c_smbus_write_byte_data(client, reg, val))
+               v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
+                               val, reg);
+}
 
-               /* check for correct range */
-               if (byte > 25 || byte < -20)
-                       return -EINVAL;
+static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
+{
+       int byte;
 
-               /* calculate actual value to set, see specs, page 18 */
-               byte /= 5;
-               if (0 < byte)
-                       byte += 0x8;
-               else
-                       byte = -byte;
+       if (t->index)
+               return -EINVAL;
 
-               result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte);
-               if (result)
-                       dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+       switch (t->audmode) {
+       case V4L2_TUNER_MODE_STEREO:
+               byte = TDA9840_SET_STEREO;
+               break;
+       case V4L2_TUNER_MODE_LANG1_LANG2:
+               byte = TDA9840_SET_BOTH;
+               break;
+       case V4L2_TUNER_MODE_LANG1:
+               byte = TDA9840_SET_LANG1;
+               break;
+       case V4L2_TUNER_MODE_LANG2:
+               byte = TDA9840_SET_LANG2;
                break;
+       default:
+               byte = TDA9840_SET_MONO;
+               break;
+       }
+       v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
+       tda9840_write(sd, SWITCH, byte);
+       return 0;
+}
 
-       case TDA9840_STEREO_ADJUST:
+static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
+{
+       struct i2c_client *client = v4l2_get_subdevdata(sd);
+       u8 byte;
 
-               dprintk("TDA9840_STEREO_ADJUST: %d\n", byte);
+       t->rxsubchans = V4L2_TUNER_SUB_MONO;
+       if (1 != i2c_master_recv(client, &byte, 1)) {
+               v4l2_dbg(1, debug, sd,
+                       "i2c_master_recv() failed\n");
+               return -EIO;
+       }
 
-               /* check for correct range */
-               if (byte > 25 || byte < -24)
-                       return -EINVAL;
+       if (byte & 0x80) {
+               v4l2_dbg(1, debug, sd,
+                       "TDA9840_DETECT: register contents invalid\n");
+               return -EINVAL;
+       }
 
-               /* calculate actual value to set */
-               byte /= 5;
-               if (0 < byte)
-                       byte += 0x20;
-               else
-                       byte = -byte;
+       v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
 
-               result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte);
-               if (result)
-                       dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
+       switch (byte & 0x60) {
+       case 0x00:
+               t->rxsubchans = V4L2_TUNER_SUB_MONO;
                break;
+       case 0x20:
+               t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
+               break;
+       case 0x40:
+               t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
+               break;
+       default: /* Incorrect detect */
+               t->rxsubchans = V4L2_TUNER_MODE_MONO;
+               break;
+       }
+       return 0;
+}
 
-       case TDA9840_DETECT: {
-               int *ret = (int *)arg;
-
-               byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST);
-               if (byte == -1) {
-                       dprintk("i2c_smbus_read_byte_data() failed\n");
-                       return -EIO;
-               }
+static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
+{
+       struct i2c_client *client = v4l2_get_subdevdata(sd);
 
-               if (0 != (byte & 0x80)) {
-                       dprintk("TDA9840_DETECT: register contents invalid\n");
-                       return -EINVAL;
-               }
+       return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
+}
 
-               dprintk("TDA9840_DETECT: byte: 0x%02x\n", byte);
-               *ret = ((byte & 0x60) >> 5);
-               result = 0;
-               break;
-       }
-       case TDA9840_TEST:
-               dprintk("TDA9840_TEST: 0x%02x\n", byte);
+/* ----------------------------------------------------------------------- */
 
-               /* mask out irrelevant bits */
-               byte &= 0x3;
+static const struct v4l2_subdev_core_ops tda9840_core_ops = {
+       .g_chip_ident = tda9840_g_chip_ident,
+};
 
-               result = i2c_smbus_write_byte_data(client, TEST, byte);
-               if (result)
-                       dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
-               break;
-       default:
-               return -ENOIOCTLCMD;
-       }
+static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
+       .s_tuner = tda9840_s_tuner,
+       .g_tuner = tda9840_g_tuner,
+};
 
-       if (result)
-               return -EIO;
+static const struct v4l2_subdev_ops tda9840_ops = {
+       .core = &tda9840_core_ops,
+       .tuner = &tda9840_tuner_ops,
+};
 
-       return 0;
-}
+/* ----------------------------------------------------------------------- */
 
-static int detect(struct i2c_adapter *adapter, int address, int kind)
+static int tda9840_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id)
 {
-       struct i2c_client *client;
-       int result = 0;
-
-       int byte = 0x0;
+       struct v4l2_subdev *sd;
 
        /* let's see whether this adapter can support what we need */
-       if (0 == i2c_check_functionality(adapter,
-                                   I2C_FUNC_SMBUS_READ_BYTE_DATA |
-                                   I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
-               return 0;
-       }
-
-       /* allocate memory for client structure */
-       client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
-       if (0 == client) {
-               printk("not enough kernel memory\n");
-               return -ENOMEM;
-       }
+       if (!i2c_check_functionality(client->adapter,
+                       I2C_FUNC_SMBUS_READ_BYTE_DATA |
+                       I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
+               return -EIO;
 
-       /* fill client structure */
-       memcpy(client, &client_template, sizeof(struct i2c_client));
-       client->addr = address;
-       client->adapter = adapter;
+       v4l_info(client, "chip found @ 0x%x (%s)\n",
+                       client->addr << 1, client->adapter->name);
 
-       /* tell the i2c layer a new client has arrived */
-       if (0 != (result = i2c_attach_client(client))) {
-               kfree(client);
-               return result;
-       }
+       sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
+       if (sd == NULL)
+               return -ENOMEM;
+       v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
 
        /* set initial values for level & stereo - adjustment, mode */
-       byte = 0;
-       result  = command(client, TDA9840_LEVEL_ADJUST, &byte);
-       result += command(client, TDA9840_STEREO_ADJUST, &byte);
-       byte = TDA9840_SET_MONO;
-       result = command(client, TDA9840_SWITCH, &byte);
-       if (result) {
-               dprintk("could not initialize tda9840\n");
-               return -ENODEV;
-       }
-
-       printk("tda9840: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
+       tda9840_write(sd, LEVEL_ADJUST, 0);
+       tda9840_write(sd, STEREO_ADJUST, 0);
+       tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
        return 0;
 }
 
-static int attach(struct i2c_adapter *adapter)
+static int tda9840_remove(struct i2c_client *client)
 {
-       /* let's see whether this is a know adapter we can attach to */
-       if (adapter->id != I2C_HW_SAA7146) {
-               dprintk("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id);
-               return -ENODEV;
-       }
+       struct v4l2_subdev *sd = i2c_get_clientdata(client);
 
-       return i2c_probe(adapter, &addr_data, &detect);
+       v4l2_device_unregister_subdev(sd);
+       kfree(sd);
+       return 0;
 }
 
-static int detach(struct i2c_client *client)
-{
-       int ret = i2c_detach_client(client);
-       kfree(client);
-       return ret;
-}
+static const struct i2c_device_id tda9840_id[] = {
+       { "tda9840", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, tda9840_id);
 
-static struct i2c_driver driver = {
+static struct i2c_driver tda9840_driver = {
        .driver = {
-               .name = "tda9840",
+               .owner  = THIS_MODULE,
+               .name   = "tda9840",
        },
-       .id     = I2C_DRIVERID_TDA9840,
-       .attach_adapter = attach,
-       .detach_client  = detach,
-       .command        = command,
-};
-
-static struct i2c_client client_template = {
-       .name = "tda9840",
-       .driver = &driver,
+       .probe          = tda9840_probe,
+       .remove         = tda9840_remove,
+       .id_table       = tda9840_id,
 };
 
-static int __init this_module_init(void)
+static __init int init_tda9840(void)
 {
-       return i2c_add_driver(&driver);
+       return i2c_add_driver(&tda9840_driver);
 }
 
-static void __exit this_module_exit(void)
+static __exit void exit_tda9840(void)
 {
-       i2c_del_driver(&driver);
+       i2c_del_driver(&tda9840_driver);
 }
 
-module_init(this_module_init);
-module_exit(this_module_exit);
-
-MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
-MODULE_DESCRIPTION("tda9840 driver");
-MODULE_LICENSE("GPL");
+module_init(init_tda9840);
+module_exit(exit_tda9840);