From 58b087cda1e9e46c7061c2282f92bd8e1970bfe7 Mon Sep 17 00:00:00 2001 From: Jim Cromie Date: Tue, 27 Jun 2006 02:54:22 -0700 Subject: [PATCH] [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 Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/pc8736x_gpio.c | 102 ++++++++++++++++++++++-------------- 1 file changed, 64 insertions(+), 38 deletions(-) diff --git a/drivers/char/pc8736x_gpio.c b/drivers/char/pc8736x_gpio.c index 83f24279f54e..b16fbef816c2 100644 --- a/drivers/char/pc8736x_gpio.c +++ b/drivers/char/pc8736x_gpio.c @@ -17,13 +17,14 @@ #include #include #include +#include #include #include -#define NAME "pc8736x_gpio" +#define DEVNAME "pc8736x_gpio" MODULE_AUTHOR("Jim Cromie "); -MODULE_DESCRIPTION("NatSemi SCx200 GPIO Pin Driver"); +MODULE_DESCRIPTION("NatSemi PC-8736x GPIO Pin Driver"); MODULE_LICENSE("GPL"); static int major; /* default to dynamic major */ @@ -42,6 +43,8 @@ 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 */ @@ -69,6 +72,8 @@ static int port_offset[] = { 0, 4, 8, 10 }; /* non-uniform offsets ! */ #define PORT_EVT_EN 2 #define PORT_EVT_STST 3 +static struct platform_device *pdev; /* use in dev_*() */ + static inline void superio_outb(int addr, int val) { outb_p(addr, superio_cmd); @@ -148,9 +153,9 @@ static int pc8736x_gpio_get(unsigned minor) 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; } @@ -164,22 +169,21 @@ static void pc8736x_gpio_set(unsigned minor, int val) bit = minor & 7; 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) @@ -194,7 +198,7 @@ static void pc8736x_gpio_set_low(unsigned index) 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; } @@ -222,7 +226,7 @@ static int pc8736x_gpio_open(struct inode *inode, struct file *file) 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; @@ -230,21 +234,31 @@ static int pc8736x_gpio_open(struct inode *inode, struct file *file) } 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; + int rc = 0; + + pdev = platform_device_alloc(DEVNAME, 0); + if (!pdev) + return -ENOMEM; - printk(KERN_DEBUG NAME " initializing\n"); + rc = platform_device_add(pdev); + if (rc) { + rc = -ENODEV; + goto undo_platform_dev_alloc; + } + dev_info(&pdev->dev, "NatSemi pc8736x GPIO Driver Initializing\n"); if (!pc8736x_superio_present()) { - printk(KERN_ERR NAME ": no device found\n"); - return -ENODEV; + rc = -ENODEV; + dev_err(&pdev->dev, "no device found\n"); + goto undo_platform_dev_add; } /* Verify that chip and it's GPIO unit are both enabled. @@ -252,44 +266,56 @@ static int __init pc8736x_gpio_init(void) */ rc = superio_inb(SIO_CF1); if (!(rc & 0x01)) { - printk(KERN_ERR NAME ": device not enabled\n"); - return -ENODEV; + rc = -ENODEV; + dev_err(&pdev->dev, "device not enabled\n"); + goto undo_platform_dev_add; } device_select(SIO_GPIO_UNIT); if (!superio_inb(SIO_UNIT_ACT)) { - printk(KERN_ERR NAME ": GPIO unit not enabled\n"); - return -ENODEV; + rc = -ENODEV; + dev_err(&pdev->dev, "GPIO unit not enabled\n"); + goto undo_platform_dev_add; } - /* read GPIO unit base address */ + /* read the GPIO unit base addr that chip responds to */ pc8736x_gpio_base = (superio_inb(SIO_BASE_HADDR) << 8 | superio_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, 16, DEVNAME)) { + rc = -ENODEV; + dev_err(&pdev->dev, "GPIO ioport %x busy\n", + pc8736x_gpio_base); + goto undo_platform_dev_add; + } + dev_info(&pdev->dev, "GPIO ioport %x reserved\n", pc8736x_gpio_base); - r = register_chrdev(major, NAME, &pc8736x_gpio_fops); - if (r < 0) { - printk(KERN_ERR NAME ": unable to register character device\n"); - return r; + rc = register_chrdev(major, DEVNAME, &pc8736x_gpio_fops); + if (rc < 0) { + dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc); + goto undo_platform_dev_add; } if (!major) { - major = r; - printk(KERN_DEBUG NAME ": got dynamic major %d\n", major); + major = rc; + dev_dbg(&pdev->dev, "got dynamic major %d\n", major); } pc8736x_init_shadow(); return 0; + +undo_platform_dev_add: + platform_device_put(pdev); +undo_platform_dev_alloc: + kfree(pdev); + return rc; } 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); -- GitLab