kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 1 | /* |
| 2 | * arch/sh/boards/landisk/gio.c - driver for landisk |
| 3 | * |
| 4 | * This driver will also support the I-O DATA Device, Inc. LANDISK Board. |
| 5 | * LANDISK and USL-5P Button, LED and GIO driver drive function. |
| 6 | * |
| 7 | * Copylight (C) 2006 kogiidena |
| 8 | * Copylight (C) 2002 Atom Create Engineering Co., Ltd. * |
| 9 | * |
| 10 | * This file is subject to the terms and conditions of the GNU General Public |
| 11 | * License. See the file "COPYING" in the main directory of this archive |
| 12 | * for more details. |
| 13 | * |
| 14 | */ |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/kdev_t.h> |
| 18 | #include <linux/cdev.h> |
| 19 | #include <linux/fs.h> |
| 20 | #include <asm/io.h> |
| 21 | #include <asm/uaccess.h> |
Paul Mundt | 0764bff | 2008-07-29 22:10:01 +0900 | [diff] [blame] | 22 | #include <mach-landisk/mach/gio.h> |
| 23 | #include <mach-landisk/mach/iodata_landisk.h> |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 24 | |
| 25 | #define DEVCOUNT 4 |
| 26 | #define GIO_MINOR 2 /* GIO minor no. */ |
| 27 | |
| 28 | static dev_t dev; |
| 29 | static struct cdev *cdev_p; |
| 30 | static int openCnt; |
| 31 | |
| 32 | static int gio_open(struct inode *inode, struct file *filp) |
| 33 | { |
| 34 | int minor; |
Jonathan Corbet | 1fa984b | 2008-05-15 09:11:26 -0600 | [diff] [blame] | 35 | int ret = -ENOENT; |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 36 | |
Thomas Gleixner | 52a9490 | 2009-10-16 14:42:33 +0900 | [diff] [blame] | 37 | preempt_disable(); |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 38 | minor = MINOR(inode->i_rdev); |
| 39 | if (minor < DEVCOUNT) { |
| 40 | if (openCnt > 0) { |
Jonathan Corbet | 1fa984b | 2008-05-15 09:11:26 -0600 | [diff] [blame] | 41 | ret = -EALREADY; |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 42 | } else { |
| 43 | openCnt++; |
Jonathan Corbet | 1fa984b | 2008-05-15 09:11:26 -0600 | [diff] [blame] | 44 | ret = 0; |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 45 | } |
| 46 | } |
Thomas Gleixner | 52a9490 | 2009-10-16 14:42:33 +0900 | [diff] [blame] | 47 | preempt_enable(); |
Jonathan Corbet | 1fa984b | 2008-05-15 09:11:26 -0600 | [diff] [blame] | 48 | return ret; |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 49 | } |
| 50 | |
| 51 | static int gio_close(struct inode *inode, struct file *filp) |
| 52 | { |
| 53 | int minor; |
| 54 | |
| 55 | minor = MINOR(inode->i_rdev); |
| 56 | if (minor < DEVCOUNT) { |
| 57 | openCnt--; |
| 58 | } |
| 59 | return 0; |
| 60 | } |
| 61 | |
Thomas Gleixner | 52a9490 | 2009-10-16 14:42:33 +0900 | [diff] [blame] | 62 | static long gio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 63 | { |
| 64 | unsigned int data; |
| 65 | static unsigned int addr = 0; |
| 66 | |
| 67 | if (cmd & 0x01) { /* write */ |
| 68 | if (copy_from_user(&data, (int *)arg, sizeof(int))) { |
| 69 | return -EFAULT; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | switch (cmd) { |
Simon Arlott | e868d61 | 2007-05-14 08:15:10 +0900 | [diff] [blame] | 74 | case GIODRV_IOCSGIOSETADDR: /* address set */ |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 75 | addr = data; |
| 76 | break; |
| 77 | |
| 78 | case GIODRV_IOCSGIODATA1: /* write byte */ |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 79 | __raw_writeb((unsigned char)(0x0ff & data), addr); |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 80 | break; |
| 81 | |
| 82 | case GIODRV_IOCSGIODATA2: /* write word */ |
| 83 | if (addr & 0x01) { |
| 84 | return -EFAULT; |
| 85 | } |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 86 | __raw_writew((unsigned short int)(0x0ffff & data), addr); |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 87 | break; |
| 88 | |
| 89 | case GIODRV_IOCSGIODATA4: /* write long */ |
| 90 | if (addr & 0x03) { |
| 91 | return -EFAULT; |
| 92 | } |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 93 | __raw_writel(data, addr); |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 94 | break; |
| 95 | |
| 96 | case GIODRV_IOCGGIODATA1: /* read byte */ |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 97 | data = __raw_readb(addr); |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 98 | break; |
| 99 | |
| 100 | case GIODRV_IOCGGIODATA2: /* read word */ |
| 101 | if (addr & 0x01) { |
| 102 | return -EFAULT; |
| 103 | } |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 104 | data = __raw_readw(addr); |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 105 | break; |
| 106 | |
| 107 | case GIODRV_IOCGGIODATA4: /* read long */ |
| 108 | if (addr & 0x03) { |
| 109 | return -EFAULT; |
| 110 | } |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 111 | data = __raw_readl(addr); |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 112 | break; |
| 113 | default: |
| 114 | return -EFAULT; |
| 115 | break; |
| 116 | } |
| 117 | |
| 118 | if ((cmd & 0x01) == 0) { /* read */ |
| 119 | if (copy_to_user((int *)arg, &data, sizeof(int))) { |
| 120 | return -EFAULT; |
| 121 | } |
| 122 | } |
| 123 | return 0; |
| 124 | } |
| 125 | |
Jan Engelhardt | 773c7bd | 2008-01-23 12:47:48 +0900 | [diff] [blame] | 126 | static const struct file_operations gio_fops = { |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 127 | .owner = THIS_MODULE, |
| 128 | .open = gio_open, /* open */ |
| 129 | .release = gio_close, /* release */ |
Thomas Gleixner | 52a9490 | 2009-10-16 14:42:33 +0900 | [diff] [blame] | 130 | .unlocked_ioctl = gio_ioctl, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 131 | .llseek = noop_llseek, |
kogiidena | 00e8c49 | 2007-03-19 16:24:12 +0900 | [diff] [blame] | 132 | }; |
| 133 | |
| 134 | static int __init gio_init(void) |
| 135 | { |
| 136 | int error; |
| 137 | |
| 138 | printk(KERN_INFO "gio: driver initialized\n"); |
| 139 | |
| 140 | openCnt = 0; |
| 141 | |
| 142 | if ((error = alloc_chrdev_region(&dev, 0, DEVCOUNT, "gio")) < 0) { |
| 143 | printk(KERN_ERR |
| 144 | "gio: Couldn't alloc_chrdev_region, error=%d\n", |
| 145 | error); |
| 146 | return 1; |
| 147 | } |
| 148 | |
| 149 | cdev_p = cdev_alloc(); |
| 150 | cdev_p->ops = &gio_fops; |
| 151 | error = cdev_add(cdev_p, dev, DEVCOUNT); |
| 152 | if (error) { |
| 153 | printk(KERN_ERR |
| 154 | "gio: Couldn't cdev_add, error=%d\n", error); |
| 155 | return 1; |
| 156 | } |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static void __exit gio_exit(void) |
| 162 | { |
| 163 | cdev_del(cdev_p); |
| 164 | unregister_chrdev_region(dev, DEVCOUNT); |
| 165 | } |
| 166 | |
| 167 | module_init(gio_init); |
| 168 | module_exit(gio_exit); |
| 169 | |
| 170 | MODULE_LICENSE("GPL"); |