rtc-rs5c372 becomes a new-style i2c driver

Convert rtc-rs5c372 to be a "new style" I2C driver, and update the
Kconfig text to be more complete..

Verified on an OMAP H4 development platform, along with a board
init patch to declare its rv5c387a device.

Only one defconfig -- powerpc/linkstation -- uses this driver; but
several other platforms use it, just without defconfig support.

Such platforms need to be converted so (a) their I2C adapter driver
supports new-style drivers, and (b) board init code declares this
I2C device.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Voipio Riku <Riku.Voipio@movial.fi>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Martin Michlmayr <tbm@cyrius.com>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 34 insertions, 61 deletions

diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c
index 09bbe575647b..6b67b5097927 100644
--- a/drivers/rtc/rtc-rs5c372.c
+++ b/drivers/rtc/rtc-rs5c372.c
@@ -13,13 +13,7 @@
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 
-#define DRV_VERSION "0.4"
-
-/* Addresses to scan */
-static unsigned short normal_i2c[] = { /* 0x32,*/ I2C_CLIENT_END };
-
-/* Insmod parameters */
-I2C_CLIENT_INSMOD;
+#define DRV_VERSION "0.5"
 
 
 /*
@@ -88,9 +82,6 @@ struct rs5c372 {
         unsigned                has_irq:1;
         char                    buf[17];
         char                    *regs;
-
-        /* on conversion to a "new style" i2c driver, this vanishes */
-        struct i2c_client       dev;
 };
 
 static int rs5c_get_regs(struct rs5c372 *rs5c)
@@ -483,25 +474,35 @@ static int rs5c_sysfs_register(struct device *dev)
         return err;
 }
 
+static void rs5c_sysfs_unregister(struct device *dev)
+{
+        device_remove_file(dev, &dev_attr_trim);
+        device_remove_file(dev, &dev_attr_osc);
+}
+
 #else
 static int rs5c_sysfs_register(struct device *dev)
 {
         return 0;
 }
+
+static void rs5c_sysfs_unregister(struct device *dev)
+{
+        /* nothing */
+}
 #endif  /* SYSFS */
 
 static struct i2c_driver rs5c372_driver;
 
-static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind)
+static int rs5c372_probe(struct i2c_client *client)
 {
         int err = 0;
-        struct i2c_client *client;
         struct rs5c372 *rs5c372;
         struct rtc_time tm;
 
-        dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
+        dev_dbg(&client->dev, "%s\n", __FUNCTION__);
 
-        if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
                 err = -ENODEV;
                 goto exit;
         }
@@ -514,35 +515,22 @@ static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind)
         /* we read registers 0x0f then 0x00-0x0f; skip the first one */
         rs5c372->regs=&rs5c372->buf[1];
 
-        /* On conversion to a "new style" i2c driver, we'll be handed
-         * the i2c_client (we won't create it)
-         */
-        client = &rs5c372->dev;
         rs5c372->client = client;
-
-        /* I2C client */
-        client->addr = address;
-        client->driver = &rs5c372_driver;
-        client->adapter = adapter;
-
-        strlcpy(client->name, rs5c372_driver.driver.name, I2C_NAME_SIZE);
-
         i2c_set_clientdata(client, rs5c372);
 
-        /* Inform the i2c layer */
-        if ((err = i2c_attach_client(client)))
-                goto exit_kfree;
-
         err = rs5c_get_regs(rs5c372);
         if (err < 0)
-                goto exit_detach;
+                goto exit_kfree;
 
-        /* For "new style" drivers, irq is in i2c_client and chip type
-         * info comes from i2c_client.dev.platform_data.  Meanwhile:
-         *
-         * STICK BOARD-SPECIFIC SETUP CODE RIGHT HERE
-         */
-        if (rs5c372->type == rtc_undef) {
+        if (strcmp(client->name, "rs5c372a") == 0)
+                rs5c372->type = rtc_rs5c372a;
+        else if (strcmp(client->name, "rs5c372b") == 0)
+                rs5c372->type = rtc_rs5c372b;
+        else if (strcmp(client->name, "rv5c386") == 0)
+                rs5c372->type = rtc_rv5c386;
+        else if (strcmp(client->name, "rv5c387a") == 0)
+                rs5c372->type = rtc_rv5c387a;
+        else {
                 rs5c372->type = rtc_rs5c372b;
                 dev_warn(&client->dev, "assuming rs5c372b\n");
         }
@@ -567,7 +555,7 @@ static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind)
                 break;
         default:
                 dev_err(&client->dev, "unknown RTC type\n");
-                goto exit_detach;
+                goto exit_kfree;
         }
 
         /* if the oscillator lost power and no other software (like
@@ -601,7 +589,7 @@ static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind)
 
                 if ((i2c_master_send(client, buf, 3)) != 3) {
                         dev_err(&client->dev, "setup error\n");
-                        goto exit_detach;
+                        goto exit_kfree;
                 }
                 rs5c372->regs[RS5C_REG_CTRL1] = buf[1];
                 rs5c372->regs[RS5C_REG_CTRL2] = buf[2];
@@ -621,14 +609,14 @@ static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind)
                         rs5c372->time24 ? "24hr" : "am/pm"
                         );
 
-        /* FIXME when client->irq exists, use it to register alarm irq */
+        /* REVISIT use client->irq to register alarm irq ... */
 
         rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name,
                                 &client->dev, &rs5c372_rtc_ops, THIS_MODULE);
 
         if (IS_ERR(rs5c372->rtc)) {
                 err = PTR_ERR(rs5c372->rtc);
-                goto exit_detach;
+                goto exit_kfree;
         }
 
         err = rs5c_sysfs_register(&client->dev);
@@ -640,9 +628,6 @@ static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind)
 exit_devreg:
         rtc_device_unregister(rs5c372->rtc);
 
-exit_detach:
-        i2c_detach_client(client);
-
 exit_kfree:
         kfree(rs5c372);
 
@@ -650,24 +635,12 @@ exit:
         return err;
 }
 
-static int rs5c372_attach(struct i2c_adapter *adapter)
+static int rs5c372_remove(struct i2c_client *client)
 {
-        return i2c_probe(adapter, &addr_data, rs5c372_probe);
-}
-
-static int rs5c372_detach(struct i2c_client *client)
-{
-        int err;
         struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
 
-        if (rs5c372->rtc)
-                rtc_device_unregister(rs5c372->rtc);
-
-        /* REVISIT properly destroy the sysfs files ... */
-
-        if ((err = i2c_detach_client(client)))
-                return err;
-
+        rtc_device_unregister(rs5c372->rtc);
+        rs5c_sysfs_unregister(&client->dev);
         kfree(rs5c372);
         return 0;
 }
@@ -676,8 +649,8 @@ static struct i2c_driver rs5c372_driver = {
         .driver         = {
                 .name   = "rtc-rs5c372",
         },
-        .attach_adapter = &rs5c372_attach,
-        .detach_client  = &rs5c372_detach,
+        .probe          = rs5c372_probe,
+        .remove         = rs5c372_remove,
 };
 
 static __init int rs5c372_init(void)