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| ******************************************************************************/ |
| |
| #include <linux/poll.h> |
| #include <linux/miscdevice.h> |
| #include "spi_dev.h" |
| #include "boardEnv/mvBoardEnvLib.h" |
| #include "voiceband/mvSysTdmSpi.h" |
| |
| /* Defines */ |
| #define SPI_MOD_NAME "spi" |
| |
| static ssize_t spi_read(struct file *file, char __user *buf, size_t size, loff_t * ppos); |
| static ssize_t spi_write(struct file *file, const char __user *buf, size_t size, loff_t * ppos); |
| static unsigned int spi_poll(struct file *pFile, poll_table *pPollTable); |
| static int spi_ioctl(struct inode *pInode, struct file *pFile, unsigned int cmd, unsigned long arg); |
| static int spi_open(struct inode *pInode, struct file *pFile); |
| static int spi_release(struct inode *pInode, struct file *pFile); |
| |
| /* SPI-API Dispatchers */ |
| static int spi_read_reg(unsigned long arg); |
| static int spi_write_reg(unsigned long arg); |
| |
| /* Structs */ |
| static struct file_operations spi_fops = { |
| owner: THIS_MODULE, |
| llseek: NULL, |
| read: spi_read, |
| write: spi_write, |
| poll: spi_poll, |
| ioctl: spi_ioctl, |
| open: spi_open, |
| release: spi_release, |
| fasync: NULL |
| }; |
| |
| /* Globals */ |
| static struct miscdevice spi_misc_dev = { |
| // .minor = SLICDEV_MINOR, |
| .minor = MISC_DYNAMIC_MINOR, |
| .name = SPI_MOD_NAME, |
| .fops = &spi_fops, |
| }; |
| |
| static ssize_t spi_read(struct file *file, char __user *buf, size_t size, loff_t * ppos) |
| { |
| return 0; |
| } |
| |
| static ssize_t spi_write(struct file *file, const char __user *buf, size_t size, loff_t * ppos) |
| { |
| return 0; |
| } |
| |
| static unsigned int spi_poll(struct file *pFile, poll_table *pPollTable) |
| { |
| return 0; |
| } |
| |
| static int spi_ioctl(struct inode *pInode, struct file *pFile, unsigned int cmd, unsigned long arg) |
| { |
| int ret = 0; |
| |
| /* Argument checking */ |
| if (_IOC_TYPE(cmd) != SPI_MOD_IOCTL_MAGIC) { |
| printk("%s: invalid SPI MOD Magic Num %i %i\n", __func__, _IOC_TYPE(cmd), SPI_MOD_IOCTL_MAGIC); |
| return -ENOTTY; |
| } |
| |
| if ((_IOC_NR(cmd) > SPI_MOD_IOCTL_MAX) || (_IOC_NR(cmd) < SPI_MOD_IOCTL_MIN)) { |
| printk("%s: invalid SPI MOD IOCTL request\n", __func__); |
| return -ENOTTY; |
| } |
| |
| if (_IOC_DIR(cmd) & _IOC_READ) { |
| ret = !access_ok(VERIFY_WRITE, (void __user*)arg, _IOC_SIZE(cmd)); |
| } |
| else if (_IOC_DIR(cmd) & _IOC_WRITE) { |
| ret = !access_ok(VERIFY_READ, (void __user*)arg, _IOC_SIZE(cmd)); |
| } |
| |
| if (ret) { |
| printk("%s: invalid SPI MOD access type %i from cmd %i\n", __func__, _IOC_DIR(cmd), cmd); |
| return -EFAULT; |
| } |
| |
| switch (cmd) { |
| |
| case SPI_MOD_IOX_REG_READ: |
| //printk("ioctl: SPI_MOD_IOX_REG_READ\n"); |
| ret = spi_read_reg(arg); |
| break; |
| |
| case SPI_MOD_IOX_REG_WRITE: |
| //printk("ioctl: SPI_MOD_IOX_REG_WRITE\n"); |
| ret = spi_write_reg(arg); |
| break; |
| |
| default: |
| printk("%s: error, ioctl command(0x%x) not supported !!!\n", __func__, cmd); |
| ret = -EFAULT; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int spi_read_reg(unsigned long arg) |
| { |
| SpiModRWObjType data; |
| |
| /* Get user data */ |
| if(copy_from_user(&data, (void*)arg, sizeof(SpiModRWObjType))) { |
| printk("%s: copy_from_user failed\n", __func__); |
| return -EFAULT; |
| } |
| |
| mvSysTdmIntDisable(data.lineId); |
| |
| mvSysTdmSpiRead(data.lineId, data.pCmdBuff, data.cmdSize, data.pDataBuff, data.dataSize); |
| |
| mvSysTdmIntEnable(data.lineId); |
| |
| /* Copy status back to user */ |
| if(copy_to_user((void*)arg, &data, sizeof(SpiModRWObjType))) { |
| printk("%s: copy_to_user failed\n", __func__); |
| return -EFAULT; |
| } |
| |
| return 0; |
| } |
| |
| static int spi_write_reg(unsigned long arg) |
| { |
| SpiModRWObjType data; |
| |
| /* Get user data */ |
| if(copy_from_user(&data, (void*)arg, sizeof(SpiModRWObjType))) { |
| printk("%s: copy_from_user failed\n", __func__); |
| return -EFAULT; |
| } |
| |
| mvSysTdmIntDisable(data.lineId); |
| |
| mvSysTdmSpiWrite(data.lineId, data.pCmdBuff, data.cmdSize, data.pDataBuff, data.dataSize); |
| |
| mvSysTdmIntEnable(data.lineId); |
| |
| /* Copy status back to user */ |
| if(copy_to_user((void*)arg, &data, sizeof(SpiModRWObjType))) { |
| printk("%s: copy_to_user failed\n", __func__); |
| return -EFAULT; |
| } |
| |
| return 0; |
| } |
| |
| static int spi_open(struct inode *pInode, struct file *pFile) |
| { |
| try_module_get(THIS_MODULE); |
| return 0; |
| } |
| |
| static int spi_release(struct inode *pInode, struct file *pFile) |
| { |
| module_put(THIS_MODULE); |
| return 0; |
| } |
| |
| int __init spi_module_init(void) |
| { |
| int status = 0; |
| |
| printk("Loading Marvell %s device\n", SPI_MOD_NAME); |
| |
| status = misc_register(&spi_misc_dev); |
| |
| /* Register SPI device module */ |
| if (status < 0) { |
| printk("Error, failed to load %s module(%d)\n", SPI_MOD_NAME, status); |
| return status; |
| } |
| return 0; |
| } |
| |
| void __exit spi_module_exit(void) |
| { |
| printk("Unloading %s device module\n", SPI_MOD_NAME); |
| |
| /* Unregister SPI misc device */ |
| misc_deregister(&spi_misc_dev); |
| |
| return; |
| } |
| |
| /* Module stuff */ |
| module_init(spi_module_init); |
| module_exit(spi_module_exit); |
| MODULE_DESCRIPTION("SPI Access Device"); |
| MODULE_AUTHOR("Nadav Haklai <nadavh@marvell.com>"); |
| MODULE_LICENSE("GPL"); |
| |