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Merge pull request #1338 from ghaerr/eth
[kernel] First pass at allowing multiple NIC device drivers in kernel
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /* | ||
| * ELKS Ethernet char device driver | ||
| * June 2022 Greg Haerr | ||
| */ | ||
|
|
||
| #include <linuxmt/init.h> | ||
| #include <linuxmt/major.h> | ||
| #include <linuxmt/errno.h> | ||
| #include <linuxmt/kernel.h> | ||
| #include <linuxmt/sched.h> | ||
|
|
||
| /* character devices and their minor numbers */ | ||
| extern struct file_operations ne2k_fops; /* 0 CONFIG_ETH_NE2K */ | ||
| extern struct file_operations wd_fops; /* 1 CONFIG_ETH_WD */ | ||
| extern struct file_operations el3_fops; /* 2 CONFIG_ETH_EL3 */ | ||
|
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||
| #define MAX_ETHS 3 | ||
|
|
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| struct eth { | ||
| struct file_operations *ops; | ||
| }; | ||
| static struct eth eths[MAX_ETHS]; | ||
|
|
||
| /* return file_operations pointer from minor number */ | ||
| static struct file_operations *get_ops(dev_t dev) | ||
| { | ||
| struct eth *eth = ðs[0]; | ||
| unsigned short minor = MINOR(dev); | ||
|
|
||
| do { | ||
| if ((eth - eths) == minor) | ||
| return eth->ops; | ||
| } while (++eth < ðs[MAX_ETHS]); | ||
|
|
||
| return NULL; | ||
| } | ||
|
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||
| static int eth_open(struct inode *inode, struct file *file) | ||
| { | ||
| struct file_operations *ops = get_ops(inode->i_rdev); | ||
|
|
||
| if (!ops) | ||
| return -ENODEV; | ||
|
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| printk("ETH open pid %d\n", current->pid); | ||
| return ops->open(inode, file); | ||
| } | ||
|
|
||
| static void eth_release(struct inode *inode, struct file *file) | ||
| { | ||
| struct file_operations *ops = get_ops(inode->i_rdev); | ||
|
|
||
| if (!ops) | ||
| return; | ||
|
|
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| printk("ETH close pid %d\n", current->pid); | ||
| ops->release(inode, file); | ||
| } | ||
|
|
||
| static size_t eth_write(struct inode *inode, struct file *file, char *data, size_t len) | ||
| { | ||
| struct file_operations *ops = get_ops(inode->i_rdev); | ||
|
|
||
| if (!ops) | ||
| return -ENODEV; | ||
| return ops->write(inode, file, data, len); | ||
| } | ||
|
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| static size_t eth_read(struct inode *inode, struct file *file, char *data, size_t len) | ||
| { | ||
| struct file_operations *ops = get_ops(inode->i_rdev); | ||
|
|
||
| if (!ops) | ||
| return -ENODEV; | ||
| return ops->read(inode, file, data, len); | ||
| } | ||
|
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||
| static int eth_ioctl(struct inode *inode, struct file *file, int cmd, char *arg) | ||
| { | ||
| struct file_operations *ops = get_ops(inode->i_rdev); | ||
|
|
||
| if (!ops) | ||
| return -ENODEV; | ||
| return ops->ioctl(inode, file, cmd, arg); | ||
| } | ||
|
|
||
| static int eth_select(struct inode *inode, struct file *file, int sel_type) | ||
| { | ||
| struct file_operations *ops = get_ops(inode->i_rdev); | ||
|
|
||
| if (!ops) | ||
| return -ENODEV; | ||
| return ops->select(inode, file, sel_type); | ||
| } | ||
|
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||
| static struct file_operations eth_fops = { | ||
| NULL, /* lseek */ | ||
| eth_read, | ||
| eth_write, | ||
| NULL, /* readdir */ | ||
| eth_select, | ||
| eth_ioctl, | ||
| eth_open, | ||
| eth_release | ||
| }; | ||
|
|
||
| void /*INITPROC*/ eth_init(void) | ||
| { | ||
| register_chrdev(ETH_MAJOR, "eth", ð_fops); | ||
|
|
||
| #ifdef CONFIG_ETH_NE2K | ||
| eths[0].ops = &ne2k_fops; | ||
| ne2k_drv_init(); | ||
| #endif | ||
| #ifdef CONFIG_ETH_WD | ||
| eths[1].ops = &wd_fops; | ||
| wd_drv_init(); | ||
| #endif | ||
| #ifdef CONFIG_ETH_EL3 | ||
| eths[2].ops = &el3_fops; | ||
| el3_drv_init(); | ||
| #endif | ||
| } |
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