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Groups > linux.kernel > #1473094

[PATCH 06/46] mtd: nandsim: Add basic control file support

From Daniel Walter <dwalter@sigma-star.at>
Newsgroups linux.kernel
Subject [PATCH 06/46] mtd: nandsim: Add basic control file support
Date 2016-08-31 09:40 +0200
Message-ID <sc8hP-7T2-1@gated-at.bofh.it> (permalink)
References <sc889-7Pb-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: Richard Weinberger <richard@nod.at>

/dev/nandsim_ctrl accept ioctl() commands such that userspace
can configure nandsim.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
 drivers/mtd/nand/nandsim.c | 66 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 56 insertions(+), 10 deletions(-)

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index 1eb9344..0abbc88 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -44,6 +44,9 @@
 #include <linux/pagemap.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
+#include <linux/compat.h>
+#include <linux/miscdevice.h>
+#include <linux/major.h>
 
 /* Default simulator parameters values */
 #if !defined(CONFIG_NANDSIM_FIRST_ID_BYTE)  || \
@@ -2226,10 +2229,41 @@ static void ns_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 	return;
 }
 
-/*
- * Module initialization function
- */
-static int __init ns_init_module(void)
+static long ns_ctrl_ioctl(struct file *file, unsigned int cmd,
+			  unsigned long arg)
+{
+	if (!capable(CAP_SYS_RESOURCE))
+		return -EPERM;
+
+	return -ENOTTY;
+}
+
+#ifdef CONFIG_COMPAT
+static long ns_ctrl_compat_ioctl(struct file *file, unsigned int cmd,
+				 unsigned long arg)
+{
+	unsigned long translated_arg = (unsigned long)compat_ptr(arg);
+
+	return ns_ctrl_ioctl(file, cmd, translated_arg);
+}
+#else
+#define ns_ctrl_compat_ioctl NULL
+#endif
+
+static const struct file_operations nansim_ctrl_fops = {
+	.owner          = THIS_MODULE,
+	.unlocked_ioctl = ns_ctrl_ioctl,
+	.compat_ioctl   = ns_ctrl_compat_ioctl,
+	.llseek         = no_llseek,
+};
+
+static struct miscdevice nandsim_ctrl_cdev = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = "nandsim_ctrl",
+	.fops = &nansim_ctrl_fops,
+};
+
+static int __init ns_init_default(void)
 {
 	struct nand_chip *chip;
 	struct nandsim *nand;
@@ -2404,12 +2438,7 @@ error:
 	return retval;
 }
 
-module_init(ns_init_module);
-
-/*
- * Module clean-up function
- */
-static void __exit ns_cleanup_module(void)
+static void __exit ns_cleanup_default(void)
 {
 	struct nand_chip *chip = mtd_to_nand(nsmtd);
 	struct nandsim *ns = nand_get_controller_data(chip);
@@ -2424,6 +2453,23 @@ static void __exit ns_cleanup_module(void)
 	free_lists();
 }
 
+static int __init ns_init_module(void)
+{
+	int ret;
+
+	ret = ns_init_default();
+	if (ret)
+		return ret;
+
+	return misc_register(&nandsim_ctrl_cdev);
+}
+module_init(ns_init_module);
+
+static void __exit ns_cleanup_module(void)
+{
+	ns_cleanup_default();
+	misc_deregister(&nandsim_ctrl_cdev);
+}
 module_exit(ns_cleanup_module);
 
 MODULE_LICENSE ("GPL");
-- 
2.8.3

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Thread

[PATCH 00/46] Nandsim facelift (part I of II) Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:30 +0200
  [PATCH 10/46] mtd: nandsim: Add helper functions for pointer magic Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:30 +0200
  [PATCH 02/46] mtd: nand: TODO Propagate mtd_device_unregister() return value in tear down Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:30 +0200
  [PATCH 07/46] mtd: nandsim: Begin with removal of global state Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:30 +0200
  [PATCH 03/46] mtd: Don't unconditionally unregister reboot notifier Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:30 +0200
  [PATCH 45/46] mtd: nandsim: Always answer all 8 bytes from NAND_CMD_READID Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 06/46] mtd: nandsim: Add basic control file support Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 43/46] mtd: nandsim: Wire up NANDSIM_IOC_NEW_INSTANCE Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 15/46] mtd: nandsim: Introduce backend operations Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 09/46] mtd: nandsim: Don't directly use module parameters Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 01/46] mtdpart: Propagate _get/put_device() Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 27/46] mtd: nandsim: Add no_oob mode Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 14/46] mtd: nandsim: Add simulator id to MTD parition name Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 44/46] mtd: nandsim: Wire up NANDSIM_IOC_DESTROY_INSTANCE Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 11/46] mtd: nandsim: Factor out nandsim parameters Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 33/46] mtd: nandsim: Relax page size restrictions Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 38/46] mtd: nandsim: Expose partition creation logic to user space Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 24/46] mtd: nandsim: Wire up NANDSIM_MODE_CACHEFILE ioctl mode Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 39/46] mtd: nandsim: Rework init error paths Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 18/46] mtd: nandsim: Add basic support for a file backend Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 08/46] mtd: nandsim: Kill global nsmtd Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 40/46] mtd: nandsim: Expose BBT, delays, etc.. to userspace Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 17/46] mtd: nandsim: Allow external backends Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 46/46] mtd/nandsim: Add ioctl for info Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 36/46] mtd: nandsim: Cleanup constants Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 42/46] mtd: nandsim: Don't printk on ENOMEM Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 19/46] mtd: nandsim: UAPI v1 Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 20/46] mtd: nandsim: Implement preliminary constructor function Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 12/46] mtd: nandsim: Make debugfs logic multi instance capable Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 04/46] mtd: Don't unconditionally execute remove notifiers Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 22/46] mtd: nandsim: Cleanup destroy handlers Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 25/46] mtd: nandsim: Print backend name Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 28/46] mtd: nandsim: Refine exports Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 31/46] mtd: nandsim: Remove NS_RAW_OFFSET_OOB Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 21/46] mtd: nandsim: Implement preliminary destructor function Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 26/46] mtd: nandsim: use the existing output macros Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 37/46] mtd: nandsim: Turn parts[] into a integer Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 41/46] mtd: nandsim: Expose support for weakpages/blocks to userspace Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 23/46] mtd: nandsim: Unify file backend init logic Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 35/46] mtd: nandsim: Make NANDSIM_MAX_DEVICES part of uapi Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 32/46] mtd: nandsim: Remove NS_IS_INITIALIZED Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 29/46] um: Add nandsim backend driver Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 34/46] mtd: nandsim: Support bitflip and read error emulation in file backend Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 05/46] mtd: Don't print a scary message when trying to remove a busy MTD Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200
  [PATCH 13/46] mtd: nandsim: Add final logic for multiple instances Daniel Walter <dwalter@sigma-star.at> - 2016-08-31 09:40 +0200

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