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Diffstat (limited to 'kernel/sound/ppc/keywest.c')
-rw-r--r--kernel/sound/ppc/keywest.c38
1 files changed, 33 insertions, 5 deletions
diff --git a/kernel/sound/ppc/keywest.c b/kernel/sound/ppc/keywest.c
index 0d1c27e91..4373615f1 100644
--- a/kernel/sound/ppc/keywest.c
+++ b/kernel/sound/ppc/keywest.c
@@ -22,6 +22,7 @@
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/delay.h>
+#include <linux/module.h>
#include <sound/core.h>
#include "pmac.h"
@@ -31,10 +32,15 @@
*/
static struct pmac_keywest *keywest_ctx;
+static bool keywest_probed;
static int keywest_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ keywest_probed = true;
+ /* If instantiated via i2c-powermac, we still need to set the client */
+ if (!keywest_ctx->client)
+ keywest_ctx->client = client;
i2c_set_clientdata(client, keywest_ctx);
return 0;
}
@@ -52,7 +58,7 @@ static int keywest_attach_adapter(struct i2c_adapter *adapter)
return -EINVAL;
if (strncmp(adapter->name, "mac-io", 6))
- return 0; /* ignored */
+ return -EINVAL; /* ignored */
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, "keywest", I2C_NAME_SIZE);
@@ -92,15 +98,16 @@ static int keywest_remove(struct i2c_client *client)
static const struct i2c_device_id keywest_i2c_id[] = {
- { "keywest", 0 },
+ { "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */
+ { "keywest", 0 }, /* instantiated by us if needed */
{ }
};
+MODULE_DEVICE_TABLE(i2c, keywest_i2c_id);
static struct i2c_driver keywest_driver = {
.driver = {
.name = "PMac Keywest Audio",
},
- .attach_adapter = keywest_attach_adapter,
.probe = keywest_probe,
.remove = keywest_remove,
.id_table = keywest_i2c_id,
@@ -132,16 +139,37 @@ int snd_pmac_tumbler_post_init(void)
/* exported */
int snd_pmac_keywest_init(struct pmac_keywest *i2c)
{
- int err;
+ struct i2c_adapter *adap;
+ int err, i = 0;
if (keywest_ctx)
return -EBUSY;
+ adap = i2c_get_adapter(0);
+ if (!adap)
+ return -EPROBE_DEFER;
+
keywest_ctx = i2c;
if ((err = i2c_add_driver(&keywest_driver))) {
snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
+ i2c_put_adapter(adap);
return err;
}
- return 0;
+
+ /* There was already a device from i2c-powermac. Great, let's return */
+ if (keywest_probed)
+ return 0;
+
+ /* We assume Macs have consecutive I2C bus numbers starting at 0 */
+ while (adap) {
+ /* Scan for devices to be bound to */
+ err = keywest_attach_adapter(adap);
+ if (!err)
+ return 0;
+ i2c_put_adapter(adap);
+ adap = i2c_get_adapter(++i);
+ }
+
+ return -ENODEV;
}