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Ip=[149.199.80.198]; Helo=[xir-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BLUPR02MB148 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190427_150519_969312_E6FA444C X-CRM114-Status: UNSURE ( 9.40 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dragan Cvetic , Derek Kiernan , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add char device interface per DT node present and support file operations: - open(), - close(), - unlocked_ioctl(), - compat_ioctl(). Tested-by: Dragan Cvetic Signed-off-by: Derek Kiernan Signed-off-by: Dragan Cvetic --- drivers/misc/xilinx_sdfec.c | 78 ++++++++++++++++++++++++++++++++++++++++ include/uapi/misc/xilinx_sdfec.h | 4 +++ 2 files changed, 82 insertions(+) diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c index a52a5c6..30879ae 100644 --- a/drivers/misc/xilinx_sdfec.c +++ b/drivers/misc/xilinx_sdfec.c @@ -25,6 +25,7 @@ #include #include #include +#include #include @@ -81,8 +82,85 @@ struct xsdfec_dev { struct xsdfec_clks clks; }; +static int xsdfec_dev_open(struct inode *iptr, struct file *fptr) +{ + struct xsdfec_dev *xsdfec; + + xsdfec = container_of(iptr->i_cdev, struct xsdfec_dev, xsdfec_cdev); + + if (!atomic_dec_and_test(&xsdfec->open_count)) { + atomic_inc(&xsdfec->open_count); + return -EBUSY; + } + + fptr->private_data = xsdfec; + return 0; +} + +static int xsdfec_dev_release(struct inode *iptr, struct file *fptr) +{ + struct xsdfec_dev *xsdfec; + + xsdfec = container_of(iptr->i_cdev, struct xsdfec_dev, xsdfec_cdev); + + atomic_inc(&xsdfec->open_count); + return 0; +} + +static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd, + unsigned long data) +{ + struct xsdfec_dev *xsdfec = fptr->private_data; + void __user *arg = NULL; + int rval = -EINVAL; + int err = 0; + + if (!xsdfec) + return rval; + + if (_IOC_TYPE(cmd) != XSDFEC_MAGIC) + return -ENOTTY; + + /* check if ioctl argument is present and valid */ + if (_IOC_DIR(cmd) != _IOC_NONE) { + arg = (void __user *)data; + if (!arg) { + dev_err(xsdfec->dev, + "xilinx sdfec ioctl argument is NULL Pointer"); + return rval; + } + } + + if (err) { + dev_err(xsdfec->dev, "Invalid xilinx sdfec ioctl argument"); + return -EFAULT; + } + + switch (cmd) { + default: + /* Should not get here */ + dev_err(xsdfec->dev, "Undefined SDFEC IOCTL"); + break; + } + return rval; +} + +#ifdef CONFIG_COMPAT +static long xsdfec_dev_compat_ioctl(struct file *file, unsigned int cmd, + unsigned long data) +{ + return xsdfec_dev_ioctl(file, cmd, (unsigned long)compat_ptr(data)); +} +#endif + static const struct file_operations xsdfec_fops = { .owner = THIS_MODULE, + .open = xsdfec_dev_open, + .release = xsdfec_dev_release, + .unlocked_ioctl = xsdfec_dev_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = xsdfec_dev_compat_ioctl, +#endif }; static int xsdfec_clk_init(struct platform_device *pdev, diff --git a/include/uapi/misc/xilinx_sdfec.h b/include/uapi/misc/xilinx_sdfec.h index ba577fa..9709759 100644 --- a/include/uapi/misc/xilinx_sdfec.h +++ b/include/uapi/misc/xilinx_sdfec.h @@ -39,4 +39,8 @@ struct xsdfec_config { __s32 fec_id; }; +/* + * XSDFEC IOCTL List + */ +#define XSDFEC_MAGIC 'f' #endif /* __XILINX_SDFEC_H__ */ -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel