i2c-au1550: Convert to platform driver
Manuel Lauss [Sun, 27 Jan 2008 17:14:52 +0000 (18:14 +0100)]
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>

arch/mips/au1000/common/platform.c
drivers/i2c/busses/i2c-au1550.c
drivers/i2c/busses/i2c-au1550.h [deleted file]

index d51e18f..841904c 100644 (file)
@@ -270,6 +270,24 @@ static struct platform_device smc91x_device = {
 
 #endif
 
+/* All Alchemy demoboards with I2C have this #define in their headers */
+#ifdef SMBUS_PSC_BASE
+static struct resource pbdb_smbus_resources[] = {
+       {
+               .start  = SMBUS_PSC_BASE,
+               .end    = SMBUS_PSC_BASE + 0x24 - 1,
+               .flags  = IORESOURCE_MEM,
+       },
+};
+
+static struct platform_device pbdb_smbus_device = {
+       .name           = "au1xpsc_smbus",
+       .id             = 0,    /* bus number */
+       .num_resources  = ARRAY_SIZE(pbdb_smbus_resources),
+       .resource       = pbdb_smbus_resources,
+};
+#endif
+
 static struct platform_device *au1xxx_platform_devices[] __initdata = {
        &au1xxx_usb_ohci_device,
        &au1x00_pcmcia_device,
@@ -287,6 +305,9 @@ static struct platform_device *au1xxx_platform_devices[] __initdata = {
 #ifdef CONFIG_MIPS_DB1200
        &smc91x_device,
 #endif
+#ifdef SMBUS_PSC_BASE
+       &pbdb_smbus_device,
+#endif
 };
 
 int __init au1xxx_platform_init(void)
index 7d51a43..1953b26 100644 (file)
 #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.");
diff --git a/drivers/i2c/busses/i2c-au1550.h b/drivers/i2c/busses/i2c-au1550.h
deleted file mode 100644 (file)
index fce15d1..0000000
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright (C) 2004 Embedded Edge, LLC <dan@embeddededge.com>
- * 2.6 port by Matt Porter <mporter@kernel.crashing.org>
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#ifndef I2C_AU1550_H
-#define I2C_AU1550_H
-
-struct i2c_au1550_data {
-       u32     psc_base;
-       int     xfer_timeout;
-       int     ack_timeout;
-};
-
-int i2c_au1550_add_bus(struct i2c_adapter *);
-int i2c_au1550_del_bus(struct i2c_adapter *);
-
-#endif /* I2C_AU1550_H */