[PATCH] chardev: GPIO for SCx200 & PC-8736x: add platform_device for use w dev_dbg
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, but this way matches better with the corresponding patch that does the same change to scx200_gpio. Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jim Cromie
Linus Torvalds
parent
681a3e7dab
commit
58b087cda1
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@ -17,13 +17,14 @@
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/nsc_gpio.h>
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#include <linux/platform_device.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#define NAME "pc8736x_gpio"
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#define DEVNAME "pc8736x_gpio"
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MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
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MODULE_DESCRIPTION("NatSemi SCx200 GPIO Pin Driver");
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MODULE_DESCRIPTION("NatSemi PC-8736x GPIO Pin Driver");
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MODULE_LICENSE("GPL");
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static int major; /* default to dynamic major */
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@ -42,6 +43,8 @@ static unsigned pc8736x_gpio_base;
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#define SIO_CF1 0x21 /* chip config, bit0 is chip enable */
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#define PC8736X_GPIO_SIZE 16
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#define SIO_UNIT_SEL 0x7 /* unit select reg */
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#define SIO_UNIT_ACT 0x30 /* unit enable */
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#define SIO_GPIO_UNIT 0x7 /* unit number of GPIO */
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@ -69,6 +72,8 @@ static int port_offset[] = { 0, 4, 8, 10 }; /* non-uniform offsets ! */
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#define PORT_EVT_EN 2
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#define PORT_EVT_STST 3
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static struct platform_device *pdev; /* use in dev_*() */
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static inline void superio_outb(int addr, int val)
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{
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outb_p(addr, superio_cmd);
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@ -148,9 +153,9 @@ static int pc8736x_gpio_get(unsigned minor)
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val >>= bit;
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val &= 1;
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printk(KERN_INFO NAME ": _gpio_get(%d from %x bit %d) == val %d\n",
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minor, pc8736x_gpio_base + port_offset[port] + PORT_IN, bit,
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val);
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dev_dbg(&pdev->dev, "_gpio_get(%d from %x bit %d) == val %d\n",
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minor, pc8736x_gpio_base + port_offset[port] + PORT_IN, bit,
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val);
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return val;
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}
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@ -164,22 +169,21 @@ static void pc8736x_gpio_set(unsigned minor, int val)
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bit = minor & 7;
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curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT);
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printk(KERN_INFO NAME
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": addr:%x cur:%x bit-pos:%d cur-bit:%x + new:%d -> bit-new:%d\n",
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pc8736x_gpio_base + port_offset[port] + PORT_OUT,
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curval, bit, (curval & ~(1 << bit)), val, (val << bit));
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dev_dbg(&pdev->dev, "addr:%x cur:%x bit-pos:%d cur-bit:%x + new:%d -> bit-new:%d\n",
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pc8736x_gpio_base + port_offset[port] + PORT_OUT,
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curval, bit, (curval & ~(1 << bit)), val, (val << bit));
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val = (curval & ~(1 << bit)) | (val << bit);
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printk(KERN_INFO NAME ": gpio_set(minor:%d port:%d bit:%d"
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") %2x -> %2x\n", minor, port, bit, curval, val);
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dev_dbg(&pdev->dev, "gpio_set(minor:%d port:%d bit:%d)"
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" %2x -> %2x\n", minor, port, bit, curval, val);
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outb_p(val, pc8736x_gpio_base + port_offset[port] + PORT_OUT);
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curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT);
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val = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_IN);
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printk(KERN_INFO NAME ": wrote %x, read: %x\n", curval, val);
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dev_dbg(&pdev->dev, "wrote %x, read: %x\n", curval, val);
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}
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static void pc8736x_gpio_set_high(unsigned index)
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@ -194,7 +198,7 @@ static void pc8736x_gpio_set_low(unsigned index)
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static int pc8736x_gpio_current(unsigned index)
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{
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printk(KERN_WARNING NAME ": pc8736x_gpio_current unimplemented\n");
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dev_warn(&pdev->dev, "pc8736x_gpio_current unimplemented\n");
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return 0;
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}
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@ -222,7 +226,7 @@ static int pc8736x_gpio_open(struct inode *inode, struct file *file)
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unsigned m = iminor(inode);
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file->private_data = &pc8736x_access;
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printk(KERN_NOTICE NAME " open %d\n", m);
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dev_dbg(&pdev->dev, "open %d\n", m);
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if (m > 63)
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return -EINVAL;
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@ -230,21 +234,31 @@ static int pc8736x_gpio_open(struct inode *inode, struct file *file)
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}
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static struct file_operations pc8736x_gpio_fops = {
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.owner = THIS_MODULE,
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.open = pc8736x_gpio_open,
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.write = nsc_gpio_write,
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.read = nsc_gpio_read,
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.owner = THIS_MODULE,
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.open = pc8736x_gpio_open,
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.write = nsc_gpio_write,
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.read = nsc_gpio_read,
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};
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static int __init pc8736x_gpio_init(void)
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{
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int r, rc;
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int rc = 0;
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printk(KERN_DEBUG NAME " initializing\n");
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pdev = platform_device_alloc(DEVNAME, 0);
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if (!pdev)
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return -ENOMEM;
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rc = platform_device_add(pdev);
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if (rc) {
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rc = -ENODEV;
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goto undo_platform_dev_alloc;
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}
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dev_info(&pdev->dev, "NatSemi pc8736x GPIO Driver Initializing\n");
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if (!pc8736x_superio_present()) {
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printk(KERN_ERR NAME ": no device found\n");
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return -ENODEV;
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rc = -ENODEV;
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dev_err(&pdev->dev, "no device found\n");
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goto undo_platform_dev_add;
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}
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/* Verify that chip and it's GPIO unit are both enabled.
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@ -252,44 +266,56 @@ static int __init pc8736x_gpio_init(void)
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*/
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rc = superio_inb(SIO_CF1);
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if (!(rc & 0x01)) {
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printk(KERN_ERR NAME ": device not enabled\n");
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return -ENODEV;
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rc = -ENODEV;
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dev_err(&pdev->dev, "device not enabled\n");
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goto undo_platform_dev_add;
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}
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device_select(SIO_GPIO_UNIT);
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if (!superio_inb(SIO_UNIT_ACT)) {
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printk(KERN_ERR NAME ": GPIO unit not enabled\n");
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return -ENODEV;
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rc = -ENODEV;
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dev_err(&pdev->dev, "GPIO unit not enabled\n");
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goto undo_platform_dev_add;
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}
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/* read GPIO unit base address */
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/* read the GPIO unit base addr that chip responds to */
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pc8736x_gpio_base = (superio_inb(SIO_BASE_HADDR) << 8
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| superio_inb(SIO_BASE_LADDR));
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if (request_region(pc8736x_gpio_base, 16, NAME))
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printk(KERN_INFO NAME ": GPIO ioport %x reserved\n",
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pc8736x_gpio_base);
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if (!request_region(pc8736x_gpio_base, 16, DEVNAME)) {
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rc = -ENODEV;
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dev_err(&pdev->dev, "GPIO ioport %x busy\n",
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pc8736x_gpio_base);
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goto undo_platform_dev_add;
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}
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dev_info(&pdev->dev, "GPIO ioport %x reserved\n", pc8736x_gpio_base);
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r = register_chrdev(major, NAME, &pc8736x_gpio_fops);
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if (r < 0) {
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printk(KERN_ERR NAME ": unable to register character device\n");
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return r;
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rc = register_chrdev(major, DEVNAME, &pc8736x_gpio_fops);
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if (rc < 0) {
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dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc);
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goto undo_platform_dev_add;
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}
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if (!major) {
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major = r;
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printk(KERN_DEBUG NAME ": got dynamic major %d\n", major);
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major = rc;
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dev_dbg(&pdev->dev, "got dynamic major %d\n", major);
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}
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pc8736x_init_shadow();
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return 0;
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undo_platform_dev_add:
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platform_device_put(pdev);
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undo_platform_dev_alloc:
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kfree(pdev);
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return rc;
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}
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static void __exit pc8736x_gpio_cleanup(void)
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{
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printk(KERN_DEBUG NAME " cleanup\n");
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dev_dbg(&pdev->dev, " cleanup\n");
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release_region(pc8736x_gpio_base, 16);
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unregister_chrdev(major, NAME);
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unregister_chrdev(major, DEVNAME);
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}
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module_init(pc8736x_gpio_init);
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