GPIO SUPPORT FOR SCx200 & PC8736x
This patch-set reworks the 2.4 vintage scx200_gpio driver for modern
2.6, and refactors GPIO support to reuse it in a new driver for the
GPIO on PC-8736x chips.
15/19. patch.pdev-pc8736x
Adds platform-device to (just introduced) driver, and uses it to
replace many printks with dev_dbg() etc. This could trivially be
merged into previous patch ?
Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx>
diffstat patch.pdev-pc8736x
pc8736x_gpio.c | 78
++++++++++++++++++++++++++++++++++----------------------
1 files changed, 47 insertions(+), 31 deletions(-)
diff -ruNp -X dontdiff -X exclude-diffs k16r-15/drivers/char/pc8736x_gpio.c
k16r-16/drivers/char/pc8736x_gpio.c
--- k16r-15/drivers/char/pc8736x_gpio.c 2006-05-28 12:22:55.000000000 -0600
+++ k16r-16/drivers/char/pc8736x_gpio.c 2006-05-28 12:23:10.000000000 -0600
@@ -17,13 +17,14 @@
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/nsc_gpio.h>
+#include <linux/platform_device.h>
#include <asm/uaccess.h>
#include <asm/io.h>
-#define NAME "pc8736x_gpio"
+#define DEVNAME "pc8736x_gpio"
MODULE_AUTHOR("Jim Cromie <jim.cromie@xxxxxxxxx>");
-MODULE_DESCRIPTION("NatSemi SCx200 GPIO Pin Driver");
+MODULE_DESCRIPTION("NatSemi PC-8736x GPIO Pin Driver");
MODULE_LICENSE("GPL");
static int major = 0; /* default to dynamic major */
@@ -43,6 +44,8 @@ static unsigned pc8736x_gpio_base;
#define SIO_CF1 0x21 /* chip config, bit0 is chip enable */
+#define PC8736X_GPIO_SIZE 16
+
#define SIO_UNIT_SEL 0x7 /* unit select reg */
#define SIO_UNIT_ACT 0x30 /* unit enable */
#define SIO_GPIO_UNIT 0x7 /* unit number of GPIO */
@@ -70,6 +73,8 @@ static int port_offset[] = { 0, 4, 8, 10
#define PORT_EVT_EN 2
#define PORT_EVT_STST 3
+static struct platform_device *pdev; /* mostly for dev_*() support */
+
static inline void sio_outb(int addr, int val)
{
outb_p(addr, sio_cmd);
@@ -155,9 +160,9 @@ static int pc8736x_gpio_get(unsigned min
val >>= bit;
val &= 1;
- printk(KERN_INFO NAME ": _gpio_get(%d from %x bit %d) == val %d\n",
- minor, pc8736x_gpio_base + port_offset[port] + PORT_IN, bit,
- val);
+ dev_dbg(&pdev->dev, "_gpio_get(%d from %x bit %d) == val %d\n",
+ minor, pc8736x_gpio_base + port_offset[port] + PORT_IN, bit,
+ val);
return val;
}
@@ -171,22 +176,21 @@ static void pc8736x_gpio_set(unsigned mi
curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT);
- printk(KERN_INFO NAME
- ": addr:%x cur:%x bit-pos:%d cur-bit:%x + new:%d ->
bit-new:%d\n",
- pc8736x_gpio_base + port_offset[port] + PORT_OUT,
- curval, bit, (curval & ~(1 << bit)), val, (val << bit));
+ dev_dbg(&pdev->dev, "addr:%x cur:%x bit-pos:%d cur-bit:%x + new:%d ->
bit-new:%d\n",
+ pc8736x_gpio_base + port_offset[port] + PORT_OUT,
+ curval, bit, (curval & ~(1 << bit)), val, (val << bit));
val = (curval & ~(1 << bit)) | (val << bit);
- printk(KERN_INFO NAME ": gpio_set(minor:%d port:%d bit:%d"
- ") %2x -> %2x\n", minor, port, bit, curval, val);
+ dev_dbg(&pdev->dev, "gpio_set(minor:%d port:%d bit:%d)"
+ " %2x -> %2x\n", minor, port, bit, curval, val);
outb_p(val, pc8736x_gpio_base + port_offset[port] + PORT_OUT);
curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT);
val = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_IN);
- printk(KERN_INFO NAME ": wrote %x, read: %x\n", curval, val);
+ dev_dbg(&pdev->dev, "wrote %x, read: %x\n", curval, val);
}
static void pc8736x_gpio_set_high(unsigned index)
@@ -201,7 +205,7 @@ static void pc8736x_gpio_set_low(unsigne
static int pc8736x_gpio_current(unsigned index)
{
- printk(KERN_WARNING NAME ": pc8736x_gpio_current unimplemented\n");
+ dev_warn(&pdev->dev, "pc8736x_gpio_current unimplemented\n");
return 0;
}
@@ -229,7 +233,7 @@ static int pc8736x_gpio_open(struct inod
unsigned m = iminor(inode);
file->private_data = &pc8736x_access;
- printk(KERN_NOTICE NAME " open %d\n", m);
+ dev_dbg(&pdev->dev, "open %d\n", m);
if (m > 63)
return -EINVAL;
@@ -237,20 +241,30 @@ static int pc8736x_gpio_open(struct inod
}
static struct file_operations pc8736x_gpio_fops = {
- .owner = THIS_MODULE,
- .open = pc8736x_gpio_open,
- .write = nsc_gpio_write,
- .read = nsc_gpio_read,
+ .owner = THIS_MODULE,
+ .open = pc8736x_gpio_open,
+ .write = nsc_gpio_write,
+ .read = nsc_gpio_read,
};
static int __init pc8736x_gpio_init(void)
{
int r, rc;
- printk(KERN_DEBUG NAME " initializing\n");
+ pdev = platform_device_alloc(DEVNAME, 0);
+ if (!pdev)
+ return -ENOMEM;
+
+ rc = platform_device_add(pdev);
+ if (rc) {
+ platform_device_put(pdev);
+ return -ENODEV;
+ }
+ dev_info(&pdev->dev, "NatSemi pc8736x GPIO Driver Initializing\n");
if (!pc8736x_superio_present()) {
- printk(KERN_ERR NAME ": no device found\n");
+ dev_err(&pdev->dev, "no device found\n");
+ platform_device_put(pdev);
return -ENODEV;
}
@@ -259,31 +273,33 @@ static int __init pc8736x_gpio_init(void
*/
rc = sio_inb(SIO_CF1);
if (!(rc & 0x01)) {
- printk(KERN_ERR NAME ": device not enabled\n");
+ dev_err(&pdev->dev, "Super-IO device not enabled\n");
return -ENODEV;
}
device_select(SIO_GPIO_UNIT);
if (!sio_inb(SIO_UNIT_ACT)) {
- printk(KERN_ERR NAME ": GPIO unit not enabled\n");
+ dev_err(&pdev->dev, "GPIO LDN-unit not enabled\n");
return -ENODEV;
}
- /* read GPIO unit base address */
+ /* read GPIO unit base address via the Super-IO port */
+
pc8736x_gpio_base = (sio_inb(SIO_BASE_HADDR) << 8
| sio_inb(SIO_BASE_LADDR));
- if (request_region(pc8736x_gpio_base, 16, NAME))
- printk(KERN_INFO NAME ": GPIO ioport %x reserved\n",
- pc8736x_gpio_base);
+ if (request_region(pc8736x_gpio_base, PC8736X_GPIO_SIZE, DEVNAME))
+ dev_info(&pdev->dev, "GPIO ioport %x reserved\n",
+ pc8736x_gpio_base);
+
- r = register_chrdev(major, NAME, &pc8736x_gpio_fops);
+ r = register_chrdev(major, DEVNAME, &pc8736x_gpio_fops);
if (r < 0) {
- printk(KERN_ERR NAME ": unable to register character device\n");
+ dev_err(&pdev->dev, "unable to register character device\n");
return r;
}
if (!major) {
major = r;
- printk(KERN_DEBUG NAME ": got dynamic major %d\n", major);
+ dev_dbg(&pdev->dev, ": got dynamic major %d\n", major);
}
return 0;
@@ -291,11 +307,11 @@ static int __init pc8736x_gpio_init(void
static void __exit pc8736x_gpio_cleanup(void)
{
- printk(KERN_DEBUG NAME " cleanup\n");
+ dev_dbg(&pdev->dev, " cleanup\n");
release_region(pc8736x_gpio_base, 16);
- unregister_chrdev(major, NAME);
+ unregister_chrdev(major, DEVNAME);
}
module_init(pc8736x_gpio_init);
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