i2c-au1550: Convert to platform driver

Convert the i2c-au1550 bus driver to platform driver, and
register a platform device for the Alchemy Db/Pb series of
boards.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 102 insertions, 64 deletions

diff --git a/drivers/i2c/busses/i2c-au1550.c b/drivers/i2c/busses/i2c-au1550.c
index 7d51a43b38d3..1953b26da56a 100644
--- a/drivers/i2c/busses/i2c-au1550.c
+++ b/drivers/i2c/busses/i2c-au1550.c
@@ -30,14 +30,22 @@
 #include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/platform_device.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/i2c.h>
+#include <linux/slab.h>
 
 #include <asm/mach-au1x00/au1xxx.h>
 #include <asm/mach-au1x00/au1xxx_psc.h>
 
-#include "i2c-au1550.h"
+struct i2c_au1550_data {
+        u32     psc_base;
+        int     xfer_timeout;
+        int     ack_timeout;
+        struct i2c_adapter adap;
+        struct resource *ioarea;
+};
 
 static int
 wait_xfer_done(struct i2c_au1550_data *adap)
@@ -299,18 +307,48 @@ static const struct i2c_algorithm au1550_algo = {
  * Prior to calling us, the 50MHz clock frequency and routing
  * must have been set up for the PSC indicated by the adapter.
  */
-int
-i2c_au1550_add_bus(struct i2c_adapter *i2c_adap)
+static int __devinit
+i2c_au1550_probe(struct platform_device *pdev)
 {
-        struct i2c_au1550_data *adap = i2c_adap->algo_data;
-        volatile psc_smb_t      *sp;
-        u32     stat;
+        struct i2c_au1550_data *priv;
+        volatile psc_smb_t *sp;
+        struct resource *r;
+        u32 stat;
+        int ret;
+
+        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!r) {
+                ret = -ENODEV;
+                goto out;
+        }
 
-        i2c_adap->algo = &au1550_algo;
+        priv = kzalloc(sizeof(struct i2c_au1550_data), GFP_KERNEL);
+        if (!priv) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        priv->ioarea = request_mem_region(r->start, r->end - r->start + 1,
+                                          pdev->name);
+        if (!priv->ioarea) {
+                ret = -EBUSY;
+                goto out_mem;
+        }
+
+        priv->psc_base = r->start;
+        priv->xfer_timeout = 200;
+        priv->ack_timeout = 200;
+
+        priv->adap.id = I2C_HW_AU1550_PSC;
+        priv->adap.nr = pdev->id;
+        priv->adap.algo = &au1550_algo;
+        priv->adap.algo_data = priv;
+        priv->adap.dev.parent = &pdev->dev;
+        strlcpy(priv->adap.name, "Au1xxx PSC I2C", sizeof(priv->adap.name));
 
         /* Now, set up the PSC for SMBus PIO mode.
         */
-        sp = (volatile psc_smb_t *)(adap->psc_base);
+        sp = (volatile psc_smb_t *)priv->psc_base;
         sp->psc_ctrl = PSC_CTRL_DISABLE;
         au_sync();
         sp->psc_sel = PSC_SEL_PS_SMBUSMODE;
@@ -348,87 +386,87 @@ i2c_au1550_add_bus(struct i2c_adapter *i2c_adap)
                 au_sync();
         } while ((stat & PSC_SMBSTAT_DR) == 0);
 
-        return i2c_add_adapter(i2c_adap);
-}
+        ret = i2c_add_numbered_adapter(&priv->adap);
+        if (ret == 0) {
+                platform_set_drvdata(pdev, priv);
+                return 0;
+        }
+
+        /* disable the PSC */
+        sp->psc_smbcfg = 0;
+        sp->psc_ctrl = PSC_CTRL_DISABLE;
+        au_sync();
 
+        release_resource(priv->ioarea);
+        kfree(priv->ioarea);
+out_mem:
+        kfree(priv);
+out:
+        return ret;
+}
 
-int
-i2c_au1550_del_bus(struct i2c_adapter *adap)
+static int __devexit
+i2c_au1550_remove(struct platform_device *pdev)
 {
-        return i2c_del_adapter(adap);
+        struct i2c_au1550_data *priv = platform_get_drvdata(pdev);
+        volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base;
+
+        platform_set_drvdata(pdev, NULL);
+        i2c_del_adapter(&priv->adap);
+        sp->psc_smbcfg = 0;
+        sp->psc_ctrl = PSC_CTRL_DISABLE;
+        au_sync();
+        release_resource(priv->ioarea);
+        kfree(priv->ioarea);
+        kfree(priv);
+        return 0;
 }
 
 static int
-pb1550_reg(struct i2c_client *client)
+i2c_au1550_suspend(struct platform_device *pdev, pm_message_t state)
 {
+        struct i2c_au1550_data *priv = platform_get_drvdata(pdev);
+        volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base;
+
+        sp->psc_ctrl = PSC_CTRL_SUSPEND;
+        au_sync();
         return 0;
 }
 
 static int
-pb1550_unreg(struct i2c_client *client)
+i2c_au1550_resume(struct platform_device *pdev)
 {
+        struct i2c_au1550_data *priv = platform_get_drvdata(pdev);
+        volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base;
+
+        sp->psc_ctrl = PSC_CTRL_ENABLE;
+        au_sync();
+        while (!(sp->psc_smbstat & PSC_SMBSTAT_SR))
+                au_sync();
         return 0;
 }
 
-static struct i2c_au1550_data pb1550_i2c_info = {
-        SMBUS_PSC_BASE, 200, 200
-};
-
-static struct i2c_adapter pb1550_board_adapter = {
-        name:              "pb1550 adapter",
-        id:                I2C_HW_AU1550_PSC,
-        algo:              NULL,
-        algo_data:         &pb1550_i2c_info,
-        client_register:   pb1550_reg,
-        client_unregister: pb1550_unreg,
+static struct platform_driver au1xpsc_smbus_driver = {
+        .driver = {
+                .name   = "au1xpsc_smbus",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = i2c_au1550_probe,
+        .remove         = __devexit_p(i2c_au1550_remove),
+        .suspend        = i2c_au1550_suspend,
+        .resume         = i2c_au1550_resume,
 };
 
-/* BIG hack to support the control interface on the Wolfson WM8731
- * audio codec on the Pb1550 board.  We get an address and two data
- * bytes to write, create an i2c message, and send it across the
- * i2c transfer function.  We do this here because we have access to
- * the i2c adapter structure.
- */
-static struct i2c_msg wm_i2c_msg;  /* We don't want this stuff on the stack */
-static  u8 i2cbuf[2];
-
-int
-pb1550_wm_codec_write(u8 addr, u8 reg, u8 val)
-{
-        wm_i2c_msg.addr = addr;
-        wm_i2c_msg.flags = 0;
-        wm_i2c_msg.buf = i2cbuf;
-        wm_i2c_msg.len = 2;
-        i2cbuf[0] = reg;
-        i2cbuf[1] = val;
-
-        return pb1550_board_adapter.algo->master_xfer(&pb1550_board_adapter, &wm_i2c_msg, 1);
-}
-
 static int __init
 i2c_au1550_init(void)
 {
-        printk(KERN_INFO "Au1550 I2C: ");
-
-        /* This is where we would set up a 50MHz clock source
-         * and routing.  On the Pb1550, the SMBus is PSC2, which
-         * uses a shared clock with USB.  This has been already
-         * configured by Yamon as a 48MHz clock, close enough
-         * for our work.
-         */
-        if (i2c_au1550_add_bus(&pb1550_board_adapter) < 0) {
-                printk("failed to initialize.\n");
-                return -ENODEV;
-        }
-
-        printk("initialized.\n");
-        return 0;
+        return platform_driver_register(&au1xpsc_smbus_driver);
 }
 
 static void __exit
 i2c_au1550_exit(void)
 {
-        i2c_au1550_del_bus(&pb1550_board_adapter);
+        platform_driver_unregister(&au1xpsc_smbus_driver);
 }
 
 MODULE_AUTHOR("Dan Malek, Embedded Edge, LLC.");