diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/sbus/char/display7seg.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/sbus/char/display7seg.c | 278 |
1 files changed, 0 insertions, 278 deletions
diff --git a/ANDROID_3.4.5/drivers/sbus/char/display7seg.c b/ANDROID_3.4.5/drivers/sbus/char/display7seg.c deleted file mode 100644 index 4b993972..00000000 --- a/ANDROID_3.4.5/drivers/sbus/char/display7seg.c +++ /dev/null @@ -1,278 +0,0 @@ -/* display7seg.c - Driver implementation for the 7-segment display - * present on Sun Microsystems CP1400 and CP1500 - * - * Copyright (c) 2000 Eric Brower (ebrower@usa.net) - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/errno.h> -#include <linux/major.h> -#include <linux/init.h> -#include <linux/miscdevice.h> -#include <linux/ioport.h> /* request_region */ -#include <linux/slab.h> -#include <linux/mutex.h> -#include <linux/of.h> -#include <linux/of_device.h> -#include <linux/atomic.h> -#include <asm/uaccess.h> /* put_/get_user */ -#include <asm/io.h> - -#include <asm/display7seg.h> - -#define D7S_MINOR 193 -#define DRIVER_NAME "d7s" -#define PFX DRIVER_NAME ": " - -static DEFINE_MUTEX(d7s_mutex); -static int sol_compat = 0; /* Solaris compatibility mode */ - -/* Solaris compatibility flag - - * The Solaris implementation omits support for several - * documented driver features (ref Sun doc 806-0180-03). - * By default, this module supports the documented driver - * abilities, rather than the Solaris implementation: - * - * 1) Device ALWAYS reverts to OBP-specified FLIPPED mode - * upon closure of device or module unload. - * 2) Device ioctls D7SIOCRD/D7SIOCWR honor toggling of - * FLIP bit - * - * If you wish the device to operate as under Solaris, - * omitting above features, set this parameter to non-zero. - */ -module_param(sol_compat, int, 0); -MODULE_PARM_DESC(sol_compat, - "Disables documented functionality omitted from Solaris driver"); - -MODULE_AUTHOR("Eric Brower <ebrower@usa.net>"); -MODULE_DESCRIPTION("7-Segment Display driver for Sun Microsystems CP1400/1500"); -MODULE_LICENSE("GPL"); -MODULE_SUPPORTED_DEVICE("d7s"); - -struct d7s { - void __iomem *regs; - bool flipped; -}; -struct d7s *d7s_device; - -/* - * Register block address- see header for details - * ----------------------------------------- - * | DP | ALARM | FLIP | 4 | 3 | 2 | 1 | 0 | - * ----------------------------------------- - * - * DP - Toggles decimal point on/off - * ALARM - Toggles "Alarm" LED green/red - * FLIP - Inverts display for upside-down mounted board - * bits 0-4 - 7-segment display contents - */ -static atomic_t d7s_users = ATOMIC_INIT(0); - -static int d7s_open(struct inode *inode, struct file *f) -{ - if (D7S_MINOR != iminor(inode)) - return -ENODEV; - atomic_inc(&d7s_users); - return 0; -} - -static int d7s_release(struct inode *inode, struct file *f) -{ - /* Reset flipped state to OBP default only if - * no other users have the device open and we - * are not operating in solaris-compat mode - */ - if (atomic_dec_and_test(&d7s_users) && !sol_compat) { - struct d7s *p = d7s_device; - u8 regval = 0; - - regval = readb(p->regs); - if (p->flipped) - regval |= D7S_FLIP; - else - regval &= ~D7S_FLIP; - writeb(regval, p->regs); - } - - return 0; -} - -static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - struct d7s *p = d7s_device; - u8 regs = readb(p->regs); - int error = 0; - u8 ireg = 0; - - if (D7S_MINOR != iminor(file->f_path.dentry->d_inode)) - return -ENODEV; - - mutex_lock(&d7s_mutex); - switch (cmd) { - case D7SIOCWR: - /* assign device register values we mask-out D7S_FLIP - * if in sol_compat mode - */ - if (get_user(ireg, (int __user *) arg)) { - error = -EFAULT; - break; - } - if (sol_compat) { - if (regs & D7S_FLIP) - ireg |= D7S_FLIP; - else - ireg &= ~D7S_FLIP; - } - writeb(ireg, p->regs); - break; - - case D7SIOCRD: - /* retrieve device register values - * NOTE: Solaris implementation returns D7S_FLIP bit - * as toggled by user, even though it does not honor it. - * This driver will not misinform you about the state - * of your hardware while in sol_compat mode - */ - if (put_user(regs, (int __user *) arg)) { - error = -EFAULT; - break; - } - break; - - case D7SIOCTM: - /* toggle device mode-- flip display orientation */ - if (regs & D7S_FLIP) - regs &= ~D7S_FLIP; - else - regs |= D7S_FLIP; - writeb(regs, p->regs); - break; - }; - mutex_unlock(&d7s_mutex); - - return error; -} - -static const struct file_operations d7s_fops = { - .owner = THIS_MODULE, - .unlocked_ioctl = d7s_ioctl, - .compat_ioctl = d7s_ioctl, - .open = d7s_open, - .release = d7s_release, - .llseek = noop_llseek, -}; - -static struct miscdevice d7s_miscdev = { - .minor = D7S_MINOR, - .name = DRIVER_NAME, - .fops = &d7s_fops -}; - -static int __devinit d7s_probe(struct platform_device *op) -{ - struct device_node *opts; - int err = -EINVAL; - struct d7s *p; - u8 regs; - - if (d7s_device) - goto out; - - p = kzalloc(sizeof(*p), GFP_KERNEL); - err = -ENOMEM; - if (!p) - goto out; - - p->regs = of_ioremap(&op->resource[0], 0, sizeof(u8), "d7s"); - if (!p->regs) { - printk(KERN_ERR PFX "Cannot map chip registers\n"); - goto out_free; - } - - err = misc_register(&d7s_miscdev); - if (err) { - printk(KERN_ERR PFX "Unable to acquire miscdevice minor %i\n", - D7S_MINOR); - goto out_iounmap; - } - - /* OBP option "d7s-flipped?" is honored as default for the - * device, and reset default when detached - */ - regs = readb(p->regs); - opts = of_find_node_by_path("/options"); - if (opts && - of_get_property(opts, "d7s-flipped?", NULL)) - p->flipped = true; - - if (p->flipped) - regs |= D7S_FLIP; - else - regs &= ~D7S_FLIP; - - writeb(regs, p->regs); - - printk(KERN_INFO PFX "7-Segment Display%s at [%s:0x%llx] %s\n", - op->dev.of_node->full_name, - (regs & D7S_FLIP) ? " (FLIPPED)" : "", - op->resource[0].start, - sol_compat ? "in sol_compat mode" : ""); - - dev_set_drvdata(&op->dev, p); - d7s_device = p; - err = 0; - -out: - return err; - -out_iounmap: - of_iounmap(&op->resource[0], p->regs, sizeof(u8)); - -out_free: - kfree(p); - goto out; -} - -static int __devexit d7s_remove(struct platform_device *op) -{ - struct d7s *p = dev_get_drvdata(&op->dev); - u8 regs = readb(p->regs); - - /* Honor OBP d7s-flipped? unless operating in solaris-compat mode */ - if (sol_compat) { - if (p->flipped) - regs |= D7S_FLIP; - else - regs &= ~D7S_FLIP; - writeb(regs, p->regs); - } - - misc_deregister(&d7s_miscdev); - of_iounmap(&op->resource[0], p->regs, sizeof(u8)); - kfree(p); - - return 0; -} - -static const struct of_device_id d7s_match[] = { - { - .name = "display7seg", - }, - {}, -}; -MODULE_DEVICE_TABLE(of, d7s_match); - -static struct platform_driver d7s_driver = { - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - .of_match_table = d7s_match, - }, - .probe = d7s_probe, - .remove = __devexit_p(d7s_remove), -}; - -module_platform_driver(d7s_driver); |