lib/math: Move dvb_math.c into lib/math/int_log.c

Some existing and new users may benefit from the intlog2() and intlog10() APIs, make them wide available. Reviewed-by: Mauro Carvalho Chehab <mchehab@kernel.org> Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org> Link: https://lore.kernel.org/r/20230619172019.21457-2-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Link: https://lore.kernel.org/r/20230703135211.87416-2-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
torvalds · Jul 9, 2023 · f97fa3d · f97fa3d
1 parent 3d74f42
commit f97fa3d
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diff --git a/Documentation/core-api/kernel-api.rst b/Documentation/core-api/kernel-api.rst
@@ -162,8 +162,11 @@ Base 2 log and power Functions
 .. kernel-doc:: include/linux/log2.h
    :internal:
 
-Integer power Functions
------------------------
+Integer log and power Functions
+-------------------------------
+
+.. kernel-doc:: include/linux/int_log.h
+   :export:
 
 .. kernel-doc:: lib/math/int_pow.c
    :export:

diff --git a/Documentation/driver-api/media/dtv-common.rst b/Documentation/driver-api/media/dtv-common.rst
@@ -3,15 +3,6 @@
 Digital TV Common functions
 ---------------------------
 
-Math functions
-~~~~~~~~~~~~~~
-
-Provide some commonly-used math functions, usually required in order to
-estimate signal strength and signal to noise measurements in dB.
-
-.. kernel-doc:: include/media/dvb_math.h
-
-
 DVB devices
 ~~~~~~~~~~~
 

diff --git a/drivers/media/dvb-core/Makefile b/drivers/media/dvb-core/Makefile
@@ -8,6 +8,6 @@ dvb-vb2-$(CONFIG_DVB_MMAP) := dvb_vb2.o
 
 dvb-core-objs := dvbdev.o dmxdev.o dvb_demux.o			\
 		 dvb_ca_en50221.o dvb_frontend.o		\
-		 $(dvb-net-y) dvb_ringbuffer.o $(dvb-vb2-y) dvb_math.o
+		 $(dvb-net-y) dvb_ringbuffer.o $(dvb-vb2-y)
 
 obj-$(CONFIG_DVB_CORE) += dvb-core.o
diff --git a/drivers/media/dvb-frontends/af9013_priv.h b/drivers/media/dvb-frontends/af9013_priv.h
@@ -12,7 +12,7 @@
 #define AF9013_PRIV_H
 
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "af9013.h"
 #include <linux/firmware.h>
 #include <linux/i2c-mux.h>

diff --git a/drivers/media/dvb-frontends/af9033_priv.h b/drivers/media/dvb-frontends/af9033_priv.h
@@ -14,7 +14,7 @@
 #include <linux/math64.h>
 #include <linux/regmap.h>
 #include <linux/kernel.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 
 struct reg_val {
 	u32 reg;

diff --git a/drivers/media/dvb-frontends/cxd2820r_priv.h b/drivers/media/dvb-frontends/cxd2820r_priv.h
@@ -11,7 +11,7 @@
 
 #include <linux/dvb/version.h>
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "cxd2820r.h"
 #include <linux/gpio/driver.h> /* For gpio_chip */
 #include <linux/math64.h>

diff --git a/drivers/media/dvb-frontends/cxd2841er.c b/drivers/media/dvb-frontends/cxd2841er.c
@@ -22,7 +22,7 @@
 #include <linux/dynamic_debug.h>
 #include <linux/kernel.h>
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include <media/dvb_frontend.h>
 #include "cxd2841er.h"
 #include "cxd2841er_priv.h"

diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_tnrdmd_dvbt2_mon.c b/drivers/media/dvb-frontends/cxd2880/cxd2880_tnrdmd_dvbt2_mon.c
@@ -11,7 +11,7 @@
 #include "cxd2880_tnrdmd_dvbt2.h"
 #include "cxd2880_tnrdmd_dvbt2_mon.h"
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 
 static const int ref_dbm_1000[4][8] = {
 	{-96000, -95000, -94000, -93000, -92000, -92000, -98000, -97000},

diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_tnrdmd_dvbt_mon.c b/drivers/media/dvb-frontends/cxd2880/cxd2880_tnrdmd_dvbt_mon.c
@@ -11,7 +11,7 @@
 #include "cxd2880_tnrdmd_dvbt.h"
 #include "cxd2880_tnrdmd_dvbt_mon.h"
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 
 static const int ref_dbm_1000[3][5] = {
 	{-93000, -91000, -90000, -89000, -88000},

diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_top.c b/drivers/media/dvb-frontends/cxd2880/cxd2880_top.c
@@ -11,7 +11,7 @@
 #include <linux/spi/spi.h>
 
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 
 #include "cxd2880.h"
 #include "cxd2880_tnrdmd_mon.h"

diff --git a/drivers/media/dvb-frontends/dib7000p.c b/drivers/media/dvb-frontends/dib7000p.c
@@ -13,7 +13,7 @@
 #include <linux/mutex.h>
 #include <asm/div64.h>
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include <media/dvb_frontend.h>
 
 #include "dib7000p.h"

diff --git a/drivers/media/dvb-frontends/dib8000.c b/drivers/media/dvb-frontends/dib8000.c
@@ -13,7 +13,7 @@
 #include <linux/mutex.h>
 #include <asm/div64.h>
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 
 #include <media/dvb_frontend.h>
 

diff --git a/drivers/media/dvb-frontends/dib9000.c b/drivers/media/dvb-frontends/dib9000.c
@@ -11,7 +11,7 @@
 #include <linux/i2c.h>
 #include <linux/mutex.h>
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include <media/dvb_frontend.h>
 
 #include "dib9000.h"

diff --git a/drivers/media/dvb-frontends/drxk_hard.c b/drivers/media/dvb-frontends/drxk_hard.c
@@ -20,7 +20,7 @@
 #include <media/dvb_frontend.h>
 #include "drxk.h"
 #include "drxk_hard.h"
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 
 static int power_down_dvbt(struct drxk_state *state, bool set_power_mode);
 static int power_down_qam(struct drxk_state *state);

diff --git a/drivers/media/dvb-frontends/lgdt3305.c b/drivers/media/dvb-frontends/lgdt3305.c
@@ -10,7 +10,7 @@
 #include <asm/div64.h>
 #include <linux/dvb/frontend.h>
 #include <linux/slab.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "lgdt3305.h"
 
 static int debug;

diff --git a/drivers/media/dvb-frontends/lgdt3306a.c b/drivers/media/dvb-frontends/lgdt3306a.c
@@ -12,7 +12,7 @@
 #include <asm/div64.h>
 #include <linux/kernel.h>
 #include <linux/dvb/frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "lgdt3306a.h"
 #include <linux/i2c-mux.h>
 

diff --git a/drivers/media/dvb-frontends/lgdt330x.c b/drivers/media/dvb-frontends/lgdt330x.c
@@ -28,7 +28,7 @@
 #include <asm/byteorder.h>
 
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "lgdt330x_priv.h"
 #include "lgdt330x.h"
 

diff --git a/drivers/media/dvb-frontends/m88ds3103_priv.h b/drivers/media/dvb-frontends/m88ds3103_priv.h
@@ -10,7 +10,7 @@
 
 #include <media/dvb_frontend.h>
 #include "m88ds3103.h"
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include <linux/firmware.h>
 #include <linux/i2c-mux.h>
 #include <linux/regmap.h>

diff --git a/drivers/media/dvb-frontends/mn88443x.c b/drivers/media/dvb-frontends/mn88443x.c
@@ -10,7 +10,7 @@
 #include <linux/gpio/consumer.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 
 #include "mn88443x.h"
 

diff --git a/drivers/media/dvb-frontends/mn88472_priv.h b/drivers/media/dvb-frontends/mn88472_priv.h
@@ -9,7 +9,7 @@
 #define MN88472_PRIV_H
 
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "mn88472.h"
 #include <linux/firmware.h>
 #include <linux/regmap.h>

diff --git a/drivers/media/dvb-frontends/mn88473_priv.h b/drivers/media/dvb-frontends/mn88473_priv.h
@@ -9,7 +9,7 @@
 #define MN88473_PRIV_H
 
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "mn88473.h"
 #include <linux/math64.h>
 #include <linux/firmware.h>

diff --git a/drivers/media/dvb-frontends/or51132.c b/drivers/media/dvb-frontends/or51132.c
@@ -27,7 +27,7 @@
 #include <linux/slab.h>
 #include <asm/byteorder.h>
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include <media/dvb_frontend.h>
 #include "or51132.h"
 

diff --git a/drivers/media/dvb-frontends/or51211.c b/drivers/media/dvb-frontends/or51211.c
@@ -26,7 +26,7 @@
 #include <linux/slab.h>
 #include <asm/byteorder.h>
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include <media/dvb_frontend.h>
 #include "or51211.h"
 

diff --git a/drivers/media/dvb-frontends/rtl2830_priv.h b/drivers/media/dvb-frontends/rtl2830_priv.h
@@ -9,7 +9,7 @@
 #define RTL2830_PRIV_H
 
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "rtl2830.h"
 #include <linux/i2c-mux.h>
 #include <linux/math64.h>

diff --git a/drivers/media/dvb-frontends/rtl2832_priv.h b/drivers/media/dvb-frontends/rtl2832_priv.h
@@ -14,7 +14,7 @@
 #include <linux/bitops.h>
 
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "rtl2832.h"
 
 struct rtl2832_dev {

diff --git a/drivers/media/dvb-frontends/si2165.c b/drivers/media/dvb-frontends/si2165.c
@@ -19,7 +19,7 @@
 #include <linux/regmap.h>
 
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "si2165_priv.h"
 #include "si2165.h"
 

diff --git a/drivers/media/dvb-frontends/stv0367.c b/drivers/media/dvb-frontends/stv0367.c
@@ -15,7 +15,7 @@
 #include <linux/slab.h>
 #include <linux/i2c.h>
 
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 
 #include "stv0367.h"
 #include "stv0367_defs.h"

diff --git a/drivers/media/dvb-frontends/tc90522.c b/drivers/media/dvb-frontends/tc90522.c
@@ -21,7 +21,7 @@
 #include <linux/kernel.h>
 #include <linux/math64.h>
 #include <linux/dvb/frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "tc90522.h"
 
 #define TC90522_I2C_THRU_REG 0xfe

diff --git a/drivers/media/dvb-frontends/tda10048.c b/drivers/media/dvb-frontends/tda10048.c
@@ -16,7 +16,7 @@
 #include <linux/math64.h>
 #include <asm/div64.h>
 #include <media/dvb_frontend.h>
-#include <media/dvb_math.h>
+#include <linux/int_log.h>
 #include "tda10048.h"
 
 #define TDA10048_DEFAULT_FIRMWARE "dvb-fe-tda10048-1.0.fw"

diff --git a/include/media/dvb_math.h → include/linux/int_log.h b/include/media/dvb_math.h → include/linux/int_log.h
@@ -1,6 +1,5 @@
 /*
- * dvb-math provides some complex fixed-point math
- * operations shared between the dvb related stuff
+ * Provides fixed-point logarithm operations.
  *
  * Copyright (C) 2006 Christoph Pfister (christophpfister@gmail.com)
  *
@@ -15,8 +14,8 @@
  * GNU Lesser General Public License for more details.
  */
 
-#ifndef __DVB_MATH_H
-#define __DVB_MATH_H
+#ifndef __LINUX_INT_LOG_H
+#define __LINUX_INT_LOG_H
 
 #include <linux/types.h>
 

diff --git a/lib/math/Makefile b/lib/math/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
-obj-y += div64.o gcd.o lcm.o int_pow.o int_sqrt.o reciprocal_div.o
+obj-y += div64.o gcd.o lcm.o int_log.o int_pow.o int_sqrt.o reciprocal_div.o
 
 obj-$(CONFIG_CORDIC)		+= cordic.o
 obj-$(CONFIG_PRIME_NUMBERS)	+= prime_numbers.o

diff --git a/drivers/media/dvb-core/dvb_math.c → lib/math/int_log.c b/drivers/media/dvb-core/dvb_math.c → lib/math/int_log.c
@@ -1,6 +1,5 @@
 /*
- * dvb-math provides some complex fixed-point math
- * operations shared between the dvb related stuff
+ * Provides fixed-point logarithm operations.
  *
  * Copyright (C) 2006 Christoph Pfister (christophpfister@gmail.com)
  *
@@ -16,10 +15,12 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/export.h>
+#include <linux/int_log.h>
 #include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/types.h>
+
 #include <asm/bug.h>
-#include <media/dvb_math.h>
 
 static const unsigned short logtable[256] = {
 	0x0000, 0x0171, 0x02e0, 0x044e, 0x05ba, 0x0725, 0x088e, 0x09f7,
@@ -53,7 +54,7 @@ static const unsigned short logtable[256] = {
 	0xe82a, 0xe8ef, 0xe9b3, 0xea77, 0xeb3b, 0xebfe, 0xecc1, 0xed83,
 	0xee45, 0xef06, 0xefc8, 0xf088, 0xf149, 0xf209, 0xf2c8, 0xf387,
 	0xf446, 0xf505, 0xf5c3, 0xf680, 0xf73e, 0xf7fb, 0xf8b7, 0xf973,
-	0xfa2f, 0xfaea, 0xfba5, 0xfc60, 0xfd1a, 0xfdd4, 0xfe8e, 0xff47
+	0xfa2f, 0xfaea, 0xfba5, 0xfc60, 0xfd1a, 0xfdd4, 0xfe8e, 0xff47,
 };
 
 unsigned int intlog2(u32 value)