linux-kernel - Re: [PATCH v2 0/2] I2C: SIS964: Bus driver

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Date:	Sat, 4 Aug 2012 00:38:29 +0000
From:	Amaury Decrême <amaury.decreme@...il.com>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	ben-linux@...ff.org, w.sang@...gutronix.de, rob@...dley.net,
	jeffrey.t.kirsher@...el.com, akpm@...ux-foundation.org,
	davem@...emloft.net, gregkh@...uxfoundation.org, joe@...ches.com,
	ralf@...ux-mips.org, dirk.brandewie@...il.com,
	jayachandranc@...logicmicro.com, linux-i2c@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	mhoffman@...htlink.com, amalysh@....de,
	李志村 (nelson) <nelson@....com>
Subject: Re: [PATCH v2 0/2] I2C: SIS964: Bus driver

> There's nothing confusing, drivers supporting several devices are
> legion. If the devices are really almost compatible, reusing an
> existing driver is the way to go.

With that in mind, here is an alpha preview of what the patch will
look like if SIS964 support is added in i2c-sis630.


diff --git a/drivers/i2c/busses/i2c-sis630.c b/drivers/i2c/busses/i2c-sis630.c
index 5d6723b..861d58b 100644
--- a/drivers/i2c/busses/i2c-sis630.c
+++ b/drivers/i2c/busses/i2c-sis630.c
@@ -33,6 +33,8 @@
        Fixed logical error by restoring of Host Master Clock
    31.07.2003
        Added block data read/write support.
+   03.08.2012
+       Added support of SiS964 - Amaury Decrême <amaury.decreme@...il.com>
 */

 /*
@@ -41,6 +43,7 @@
    Supports:
        SIS 630
        SIS 730
+       SIS 964

    Note: we assume there can only be one device, with one SMBus interface.
 */
@@ -55,22 +58,22 @@
 #include <linux/acpi.h>
 #include <linux/io.h>

+/* SIS964 id, defined here as we are the only file using it */
+#define PCI_DEVICE_ID_SI_964   0x0964
+
 /* SIS630 SMBus registers */
-#define SMB_STS                        0x80    /* status */
-#define SMB_EN                 0x81    /* status enable */
-#define SMB_CNT                        0x82
-#define SMBHOST_CNT            0x83
-#define SMB_ADDR               0x84
-#define SMB_CMD                        0x85
-#define SMB_PCOUNT             0x86    /* processed count */
-#define SMB_COUNT              0x87
-#define SMB_BYTE               0x88    /* ~0x8F data byte field */
-#define SMBDEV_ADDR            0x90
-#define SMB_DB0                        0x91
-#define SMB_DB1                        0x92
-#define SMB_SAA                        0x93
-
-/* register count for request_region */
+#define SMB_STS                        0x00 + offset   /* status */
+#define SMB_CNT                        0x02 + offset   /* control */
+#define SMBHOST_CNT            0x03 + offset   /* host control */
+#define SMB_ADDR               0x04 + offset   /* address */
+#define SMB_CMD                        0x05 + offset   /* command */
+#define SMB_COUNT              0x07 + offset   /* byte count */
+#define SMB_BYTE               0x08 + offset   /* ~0x8F data byte field */
+#define SMB_SAA                        0x13 + offset   /* host slave
alias address */
+
+/* register count for request_region
+ * As we don't use SMB_PCOUNT 20 is ok for SiS630 and SiS964
+ */
 #define SIS630_SMB_IOREGION    20

 /* PCI address constants */
@@ -107,9 +110,13 @@ static unsigned short acpi_base;
 static int supported[] = {
        PCI_DEVICE_ID_SI_630,
        PCI_DEVICE_ID_SI_730,
+       PCI_DEVICE_ID_SI_964,
        0 /* terminates the list */
 };

+/* SMB registers offset */
+static int offset;
+
 static inline u8 sis630_read(u8 reg)
 {
        return inb(acpi_base + reg);
@@ -412,6 +419,10 @@ static int __devinit sis630_setup(struct pci_dev
*sis630_dev)
                return -ENODEV;
        }

+       if (supported[i] == PCI_DEVICE_ID_SI_964)
+               offset = 0xE0;
+       else
+               offset = 0x80;
        /*
           Enable ACPI first , so we can accsess reg 74-75
           in acpi io space and read acpi base addr
@@ -474,6 +485,7 @@ static struct i2c_adapter sis630_adapter = {

 static DEFINE_PCI_DEVICE_TABLE(sis630_ids) = {
        { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
+       { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_964) },
        { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_LPC) },
        { 0, }
 };
@@ -482,6 +494,7 @@ MODULE_DEVICE_TABLE (pci, sis630_ids);

 static int __devinit sis630_probe(struct pci_dev *dev, const struct
pci_device_id *id)
 {
+       dev_dbg(&dev->dev, "salut");
        if (sis630_setup(dev)) {
                dev_err(&dev->dev, "SIS630 comp. bus not detected,
module not inserted.\n");
                return -ENODEV;


--
Amaury Decrême
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