Remove the local extern declaration of system_rev and
included <asm/system_info.h> to use the existing declaration.

Convert printk() calls to pr_err() and pr_info(),
and fix other checkpatch.pl reported warnings and errors.

No functional changes intended.

Signed-off-by: Shyam Sunder Reddy Padira <shyamsunderreddypadira@gmail.com>
---
 drivers/char/ds1620.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/char/ds1620.c b/drivers/char/ds1620.c
index 44a1cdbd4bfb..1eab82b50aa5 100644
--- a/drivers/char/ds1620.c
+++ b/drivers/char/ds1620.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
+ *   Dallas Semiconductors DS1620
  *   thermometer driver (as used in the Rebel.com NetWinder)
  */
 #include <linux/module.h>
@@ -16,6 +16,7 @@
 #include <asm/mach-types.h>
 #include <linux/uaccess.h>
 #include <asm/therm.h>
+#include <asm/system_info.h>
 
 #ifdef CONFIG_PROC_FS
 /* define for /proc interface */
@@ -37,7 +38,7 @@
 #define CFG_1SHOT		1
 
 static DEFINE_MUTEX(ds1620_mutex);
-static const char *fan_state[] = { "off", "on", "on (hardwired)" };
+static const char *const fan_state[] = { "off", "on", "on (hardwired)" };
 
 /*
  * Start of NetWinder specifics
@@ -46,7 +47,6 @@ static const char *fan_state[] = { "off", "on", "on (hardwired)" };
  *  chance that the WaveArtist driver could touch these bits to
  *  enable or disable the speaker.
  */
-extern unsigned int system_rev;
 
 static inline void netwinder_ds1620_set_clk(int clk)
 {
@@ -245,7 +245,7 @@ ds1620_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 	uarg.i = (int __user *)arg;
 
-	switch(cmd) {
+	switch (cmd) {
 	case CMD_SET_THERMOSTATE:
 	case CMD_SET_THERMOSTATE2:
 		if (!capable(CAP_SYS_ADMIN))
@@ -310,7 +310,7 @@ ds1620_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 		netwinder_set_fan(i);
 		break;
-		
+
 	default:
 		return -ENOIOCTLCMD;
 	}
@@ -393,14 +393,14 @@ static int __init ds1620_init(void)
 
 #ifdef THERM_USE_PROC
 	if (!proc_create_single("therm", 0, NULL, ds1620_proc_therm_show))
-		printk(KERN_ERR "therm: unable to register /proc/therm\n");
+		pr_err("therm: unable to register /proc/therm\n");
 #endif
 
 	ds1620_read_state(&th);
 	ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
 
-	printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, "
-	       "current %i.%i C, fan %s.\n",
+	pr_info("Thermostat: high %i.%i, low %i.%i,
+		current %i.%i C, fan %s.\n",
 	       th.hi >> 1, th.hi & 1 ? 5 : 0,
 	       th.lo >> 1, th.lo & 1 ? 5 : 0,
 	       ret   >> 1, ret   & 1 ? 5 : 0,
-- 
2.43.0

On Sat, Apr 11, 2026 at 01:50:25PM +0530, Shyam Sunder Reddy Padira wrote:
> Remove the local extern declaration of system_rev and
> included <asm/system_info.h> to use the existing declaration.
> 
> Convert printk() calls to pr_err() and pr_info(),
> and fix other checkpatch.pl reported warnings and errors.
> 
> No functional changes intended.

Plaese do not do checkpatch cleanups outside of drivers/staging/ unless
the subsystem maintainer says it is ok to do that, or you are the
maintainer of the driver.

Also, checkpatch cleanups need to be "one patch per logical thing".

If you are looking to do basic "how to get involved" tasks, stick to
drivers/staging/ please, that is what it is there for.

thanks,

greg k-h