[PATCH 3/4] Export symbols and make a few symbols constant.
Nelson Castillo
arhuaco at freaks-unidos.net
Tue Mar 10 13:00:21 CET 2009
From: Nelson Castillo <arhuaco at freaks-unidos.net>
~ Make a few symbols constant.
~ Export symbols explicitly.
~ Move ts_filter.c to ts_filter_chain.c (this will make sense later).
Signed-off-by: Nelson Castillo <arhuaco at freaks-unidos.net>
---
arch/arm/mach-s3c2410/include/mach/ts.h | 4 -
arch/arm/mach-s3c2442/mach-gta02.c | 12 +-
arch/arm/plat-s3c24xx/devs.c | 5 -
drivers/input/touchscreen/Makefile | 2
drivers/input/touchscreen/ts_filter.c | 166 --------------------------
drivers/input/touchscreen/ts_filter.h | 15 +-
drivers/input/touchscreen/ts_filter_chain.c | 168 ++++++++++++++++++++++++++
drivers/input/touchscreen/ts_filter_group.c | 5 -
drivers/input/touchscreen/ts_filter_group.h | 2
drivers/input/touchscreen/ts_filter_linear.c | 6 +
drivers/input/touchscreen/ts_filter_linear.h | 2
drivers/input/touchscreen/ts_filter_mean.c | 5 -
drivers/input/touchscreen/ts_filter_mean.h | 2
drivers/input/touchscreen/ts_filter_median.c | 6 +
drivers/input/touchscreen/ts_filter_median.h | 2
15 files changed, 206 insertions(+), 196 deletions(-)
delete mode 100644 drivers/input/touchscreen/ts_filter.c
create mode 100644 drivers/input/touchscreen/ts_filter_chain.c
diff --git a/arch/arm/mach-s3c2410/include/mach/ts.h b/arch/arm/mach-s3c2410/include/mach/ts.h
index 0600b30..41ac64c 100644
--- a/arch/arm/mach-s3c2410/include/mach/ts.h
+++ b/arch/arm/mach-s3c2410/include/mach/ts.h
@@ -27,9 +27,9 @@ struct s3c2410_ts_mach_info {
* Null-terminated array of pointers to filter APIs and configurations
* we want to use. In the same order they will be applied.
*/
- struct ts_filter_configuration *filter_config;
+ const struct ts_filter_configuration *filter_config;
};
-void set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info);
+void set_s3c2410ts_info(const struct s3c2410_ts_mach_info *hard_s3c2410ts_info);
#endif /* __ASM_ARM_TS_H */
diff --git a/arch/arm/mach-s3c2442/mach-gta02.c b/arch/arm/mach-s3c2442/mach-gta02.c
index 49cf09e..fa55aba 100644
--- a/arch/arm/mach-s3c2442/mach-gta02.c
+++ b/arch/arm/mach-s3c2442/mach-gta02.c
@@ -952,32 +952,32 @@ static struct s3c2410_udc_mach_info gta02_udc_cfg = {
/* Touchscreen configuration. */
#ifdef CONFIG_TOUCHSCREEN_FILTER
-static struct ts_filter_group_configuration gta02_ts_group = {
+const static struct ts_filter_group_configuration gta02_ts_group = {
.length = 12,
.close_enough = 10,
.threshold = 6, /* At least half of the points in a group. */
.attempts = 10,
};
-static struct ts_filter_median_configuration gta02_ts_median = {
+const static struct ts_filter_median_configuration gta02_ts_median = {
.extent = 20,
.decimation_below = 3,
.decimation_threshold = 8 * 3,
.decimation_above = 4,
};
-static struct ts_filter_mean_configuration gta02_ts_mean = {
+const static struct ts_filter_mean_configuration gta02_ts_mean = {
.length = 4,
};
-static struct ts_filter_linear_configuration gta02_ts_linear = {
+const static struct ts_filter_linear_configuration gta02_ts_linear = {
.constants = {1, 0, 0, 0, 1, 0, 1}, /* Don't modify coords. */
.coord0 = 0,
.coord1 = 1,
};
#endif
-struct ts_filter_configuration filter_configuration[] =
+const struct ts_filter_configuration filter_configuration[] =
{
#ifdef CONFIG_TOUCHSCREEN_FILTER
{&ts_filter_group_api, >a02_ts_group.config},
@@ -988,7 +988,7 @@ struct ts_filter_configuration filter_configuration[] =
{NULL, NULL},
};
-static struct s3c2410_ts_mach_info gta02_ts_cfg = {
+const static struct s3c2410_ts_mach_info gta02_ts_cfg = {
.delay = 10000,
.presc = 0xff, /* slow as we can go */
.filter_config = filter_configuration,
diff --git a/arch/arm/plat-s3c24xx/devs.c b/arch/arm/plat-s3c24xx/devs.c
index a3f8102..cdef1f3 100644
--- a/arch/arm/plat-s3c24xx/devs.c
+++ b/arch/arm/plat-s3c24xx/devs.c
@@ -241,9 +241,10 @@ EXPORT_SYMBOL(s3c_device_ts);
static struct s3c2410_ts_mach_info s3c2410ts_info;
-void set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info)
+void set_s3c2410ts_info(const struct s3c2410_ts_mach_info *hard_s3c2410ts_info)
{
- memcpy(&s3c2410ts_info,hard_s3c2410ts_info,sizeof(struct s3c2410_ts_mach_info));
+ memcpy(&s3c2410ts_info, hard_s3c2410ts_info,
+ sizeof(struct s3c2410_ts_mach_info));
s3c_device_ts.dev.platform_data = &s3c2410ts_info;
}
EXPORT_SYMBOL(set_s3c2410ts_info);
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 2669d63..940570b 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -35,7 +35,7 @@ wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
-obj-$(CONFIG_TOUCHSCREEN_FILTER) += ts_filter.o
+obj-$(CONFIG_TOUCHSCREEN_FILTER) += ts_filter_chain.o
obj-$(CONFIG_TOUCHSCREEN_FILTER_GROUP) += ts_filter_group.o
obj-$(CONFIG_TOUCHSCREEN_FILTER_LINEAR) += ts_filter_linear.o
obj-$(CONFIG_TOUCHSCREEN_FILTER_MEDIAN) += ts_filter_median.o
diff --git a/drivers/input/touchscreen/ts_filter.c b/drivers/input/touchscreen/ts_filter.c
deleted file mode 100644
index 5551fe3..0000000
--- a/drivers/input/touchscreen/ts_filter.c
+++ /dev/null
@@ -1,166 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Copyright (c) 2008,2009 Andy Green <andy at openmoko.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include "ts_filter.h"
-
-/*
- * Tux, would you like the following function in /lib?
- * It helps us avoid silly code.
- */
-
-/**
- * sptrlen - Count how many non-null pointers are in a pointer array
- * @arr: The array of pointers
- */
-static int sptrlen(void *arr)
-{
- int **p = arr; /* all pointers have the same size */
- int len = 0;
-
- while (*(p++))
- len++;
-
- return len;
-}
-
-/* FIXME: rename & remove this temporal hack. */
-static struct ts_filter **revchain;
-
-struct ts_filter **ts_filter_chain_create(struct platform_device *pdev,
- struct ts_filter_configuration conf[],
- int count_coords)
-{
- struct ts_filter **arr;
- int count = 0;
- int len;
- int nrev = 0;
-
- BUG_ON((count_coords < 1));
- BUG_ON(count_coords > MAX_TS_FILTER_COORDS);
-
- len = (sptrlen(conf) + 1);
- /* memory for two null-terminated arrays of filters */
- arr = kzalloc(2 * sizeof(struct ts_filter *) * len, GFP_KERNEL);
- if (!arr)
- goto create_err;
- revchain = arr + len;
-
- while (conf->api) {
- /* TODO: Can we get away with only sending pdev->dev? */
- struct ts_filter *f =
- (conf->api->create)(pdev, conf->config, count_coords);
- if (!f) {
- dev_info(&pdev->dev, "Filter %d creation failed\n",
- count);
- goto create_err;
- }
-
- f->api = conf->api;
- arr[count++] = f;
-
- /* Filters that can propagate values in the chain. */
- if (f->api->haspoint && f->api->getpoint && f->api->process)
- revchain[nrev++] = f;
-
- conf++;
- }
-
- dev_info(&pdev->dev, "%d filter(s) initialized\n", count);
-
- return arr;
-
-create_err:
-
- dev_info(&pdev->dev, "Error in filter chain initialization\n");
-
- ts_filter_chain_destroy(arr);
-
- return NULL;
-}
-EXPORT_SYMBOL_GPL(ts_filter_chain_create);
-
-void ts_filter_chain_destroy(struct ts_filter **arr)
-{
- struct ts_filter **a = arr;
- int count = 0;
-
- while (arr && *a) {
- ((*a)->api->destroy)(*a);
- a++;
- count++;
- }
-
- kfree(arr);
-}
-EXPORT_SYMBOL_GPL(ts_filter_chain_destroy);
-
-void ts_filter_chain_clear(struct ts_filter **arr)
-{
- while (*arr) {
- if ((*arr)->api->clear)
- ((*arr)->api->clear)(*arr);
- arr++;
- }
-}
-EXPORT_SYMBOL_GPL(ts_filter_chain_clear);
-
-static void ts_filter_chain_scale(struct ts_filter **a, int *coords)
-{
- while (*a) {
- if ((*a)->api->scale)
- ((*a)->api->scale)(*a, coords);
- a++;
- }
-}
-
-int ts_filter_chain_feed(struct ts_filter **arr, int *coords)
-{
- /* FIXME: only using revchain */
- int len = sptrlen(revchain); /* FIXME: save this */
- int i = len - 1;
-
- if (!arr[0])
- return 1; /* Nothing to do. Filtering disabled. */
-
- BUG_ON(arr[0]->api->haspoint(arr[0]));
-
- if (arr[0]->api->process(arr[0], coords))
- return -1;
-
- while (i >= 0 && i < len) {
- if (revchain[i]->api->haspoint(revchain[i])) {
- revchain[i]->api->getpoint(revchain[i], coords);
- if (++i < len &&
- revchain[i]->api->process(revchain[i], coords))
- return -1; /* Error. */
- } else {
- i--;
- }
- }
-
- if (i >= 0) {
- BUG_ON(i != len); /* FIXME: Remove BUG_ON. */
- ts_filter_chain_scale(arr, coords); /* TODO: arr! */
- }
-
- return i >= 0; /* Same as i == len. */
-}
-EXPORT_SYMBOL_GPL(ts_filter_chain_feed);
-
diff --git a/drivers/input/touchscreen/ts_filter.h b/drivers/input/touchscreen/ts_filter.h
index 630ea51..0e4704f 100644
--- a/drivers/input/touchscreen/ts_filter.h
+++ b/drivers/input/touchscreen/ts_filter.h
@@ -18,9 +18,10 @@ struct ts_filter_configuration;
struct ts_filter_api {
/* Create the filter - mandatory. */
- struct ts_filter * (*create)(struct platform_device *pdev,
- struct ts_filter_configuration *config,
- int count_coords);
+ struct ts_filter * (*create)(
+ struct platform_device *pdev,
+ const struct ts_filter_configuration *config,
+ int count_coords);
/* Destroy the filter - mandatory. */
void (*destroy)(struct ts_filter *filter);
/* Clear the filter - optional. */
@@ -62,14 +63,14 @@ struct ts_filter_api {
*/
struct ts_filter_configuration {
/* API to use */
- struct ts_filter_api *api;
+ const struct ts_filter_api *api;
/* Generic filter configuration. Different for each filter. */
- struct ts_filter_configuration *config;
+ const struct ts_filter_configuration *config;
};
struct ts_filter {
/* Operations for this filter. */
- struct ts_filter_api *api;
+ const struct ts_filter_api *api;
/* Number of coordinates to process. */
int count_coords;
};
@@ -82,7 +83,7 @@ struct ts_filter {
*/
extern struct ts_filter **ts_filter_chain_create(
struct platform_device *pdev,
- struct ts_filter_configuration conf[],
+ const struct ts_filter_configuration conf[],
int count_coords);
/* Helper to destroy a whole chain from the list of filter pointers. */
diff --git a/drivers/input/touchscreen/ts_filter_chain.c b/drivers/input/touchscreen/ts_filter_chain.c
new file mode 100644
index 0000000..9b2b1c5
--- /dev/null
+++ b/drivers/input/touchscreen/ts_filter_chain.c
@@ -0,0 +1,168 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Copyright (c) 2008,2009 Andy Green <andy at openmoko.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include "ts_filter.h"
+
+/*
+ * Tux, would you like the following function in /lib?
+ * It helps us avoid silly code.
+ */
+
+/**
+ * sptrlen - Count how many non-null pointers are in a pointer array
+ * @arr: The array of pointers
+ */
+static int sptrlen(const void *arr)
+{
+ /* All pointers have the same size. */
+ const int **p = (const int **)arr;
+ int len = 0;
+
+ while (*(p++))
+ len++;
+
+ return len;
+}
+
+/* FIXME: rename & remove this temporal hack. */
+static struct ts_filter **revchain;
+
+struct ts_filter **ts_filter_chain_create(
+ struct platform_device *pdev,
+ const struct ts_filter_configuration conf[],
+ int count_coords)
+{
+ struct ts_filter **arr;
+ int count = 0;
+ int len;
+ int nrev = 0;
+
+ BUG_ON((count_coords < 1));
+ BUG_ON(count_coords > MAX_TS_FILTER_COORDS);
+
+ len = (sptrlen(conf) + 1);
+ /* memory for two null-terminated arrays of filters */
+ arr = kzalloc(2 * sizeof(struct ts_filter *) * len, GFP_KERNEL);
+ if (!arr)
+ goto create_err;
+ revchain = arr + len;
+
+ while (conf->api) {
+ /* TODO: Can we get away with only sending pdev->dev? */
+ struct ts_filter *f =
+ (conf->api->create)(pdev, conf->config, count_coords);
+ if (!f) {
+ dev_info(&pdev->dev, "Filter %d creation failed\n",
+ count);
+ goto create_err;
+ }
+
+ f->api = conf->api;
+ arr[count++] = f;
+
+ /* Filters that can propagate values in the chain. */
+ if (f->api->haspoint && f->api->getpoint && f->api->process)
+ revchain[nrev++] = f;
+
+ conf++;
+ }
+
+ dev_info(&pdev->dev, "%d filter(s) initialized\n", count);
+
+ return arr;
+
+create_err:
+
+ dev_info(&pdev->dev, "Error in filter chain initialization\n");
+
+ ts_filter_chain_destroy(arr);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(ts_filter_chain_create);
+
+void ts_filter_chain_destroy(struct ts_filter **arr)
+{
+ struct ts_filter **a = arr;
+ int count = 0;
+
+ while (arr && *a) {
+ ((*a)->api->destroy)(*a);
+ a++;
+ count++;
+ }
+
+ kfree(arr);
+}
+EXPORT_SYMBOL_GPL(ts_filter_chain_destroy);
+
+void ts_filter_chain_clear(struct ts_filter **arr)
+{
+ while (*arr) {
+ if ((*arr)->api->clear)
+ ((*arr)->api->clear)(*arr);
+ arr++;
+ }
+}
+EXPORT_SYMBOL_GPL(ts_filter_chain_clear);
+
+static void ts_filter_chain_scale(struct ts_filter **a, int *coords)
+{
+ while (*a) {
+ if ((*a)->api->scale)
+ ((*a)->api->scale)(*a, coords);
+ a++;
+ }
+}
+
+int ts_filter_chain_feed(struct ts_filter **arr, int *coords)
+{
+ /* FIXME: only using revchain */
+ int len = sptrlen(revchain); /* FIXME: save this */
+ int i = len - 1;
+
+ if (!arr[0])
+ return 1; /* Nothing to do. Filtering disabled. */
+
+ BUG_ON(arr[0]->api->haspoint(arr[0]));
+
+ if (arr[0]->api->process(arr[0], coords))
+ return -1;
+
+ while (i >= 0 && i < len) {
+ if (revchain[i]->api->haspoint(revchain[i])) {
+ revchain[i]->api->getpoint(revchain[i], coords);
+ if (++i < len &&
+ revchain[i]->api->process(revchain[i], coords))
+ return -1; /* Error. */
+ } else {
+ i--;
+ }
+ }
+
+ if (i >= 0) {
+ BUG_ON(i != len); /* FIXME: Remove BUG_ON. */
+ ts_filter_chain_scale(arr, coords); /* TODO: arr! */
+ }
+
+ return i >= 0; /* Same as i == len. */
+}
+EXPORT_SYMBOL_GPL(ts_filter_chain_feed);
+
diff --git a/drivers/input/touchscreen/ts_filter_group.c b/drivers/input/touchscreen/ts_filter_group.c
index ac3229f..18236e2 100644
--- a/drivers/input/touchscreen/ts_filter_group.c
+++ b/drivers/input/touchscreen/ts_filter_group.c
@@ -85,7 +85,7 @@ static void ts_filter_group_clear(struct ts_filter *tsf)
static struct ts_filter *ts_filter_group_create(
struct platform_device *pdev,
- struct ts_filter_configuration *conf,
+ const struct ts_filter_configuration *conf,
int count_coords)
{
struct ts_filter_group *tsfg;
@@ -283,7 +283,7 @@ static void ts_filter_group_scale(struct ts_filter *tsf, int *coords)
ts_filter_group_clear_internal(priv, priv->config->attempts);
}
-struct ts_filter_api ts_filter_group_api = {
+const struct ts_filter_api ts_filter_group_api = {
.create = ts_filter_group_create,
.destroy = ts_filter_group_destroy,
.clear = ts_filter_group_clear,
@@ -292,4 +292,5 @@ struct ts_filter_api ts_filter_group_api = {
.getpoint = ts_filter_group_getpoint,
.scale = ts_filter_group_scale,
};
+EXPORT_SYMBOL_GPL(ts_filter_group_api);
diff --git a/drivers/input/touchscreen/ts_filter_group.h b/drivers/input/touchscreen/ts_filter_group.h
index 4fc2af7..c7d094d 100644
--- a/drivers/input/touchscreen/ts_filter_group.h
+++ b/drivers/input/touchscreen/ts_filter_group.h
@@ -31,6 +31,6 @@ struct ts_filter_group_configuration {
struct ts_filter_configuration config;
};
-extern struct ts_filter_api ts_filter_group_api;
+extern const struct ts_filter_api ts_filter_group_api;
#endif
diff --git a/drivers/input/touchscreen/ts_filter_linear.c b/drivers/input/touchscreen/ts_filter_linear.c
index bb63814..8a10495 100644
--- a/drivers/input/touchscreen/ts_filter_linear.c
+++ b/drivers/input/touchscreen/ts_filter_linear.c
@@ -127,7 +127,7 @@ static ssize_t const_store(struct const_obj *obj, struct const_attribute *attr,
static struct ts_filter *ts_filter_linear_create(
struct platform_device *pdev,
- struct ts_filter_configuration *conf,
+ const struct ts_filter_configuration *conf,
int count_coords)
{
struct ts_filter_linear *tsfl;
@@ -194,8 +194,10 @@ static void ts_filter_linear_scale(struct ts_filter *tsf, int *coords)
coords[tsfl->config->coord1] = (k[5] + k[3] * c0 + k[4] * c1) / k[6];
}
-struct ts_filter_api ts_filter_linear_api = {
+const struct ts_filter_api ts_filter_linear_api = {
.create = ts_filter_linear_create,
.destroy = ts_filter_linear_destroy,
.scale = ts_filter_linear_scale,
};
+EXPORT_SYMBOL_GPL(ts_filter_linear_api);
+
diff --git a/drivers/input/touchscreen/ts_filter_linear.h b/drivers/input/touchscreen/ts_filter_linear.h
index 5cd9a81..67f6f94 100644
--- a/drivers/input/touchscreen/ts_filter_linear.h
+++ b/drivers/input/touchscreen/ts_filter_linear.h
@@ -26,6 +26,6 @@ struct ts_filter_linear_configuration {
struct ts_filter_configuration config;
};
-extern struct ts_filter_api ts_filter_linear_api;
+extern const struct ts_filter_api ts_filter_linear_api;
#endif
diff --git a/drivers/input/touchscreen/ts_filter_mean.c b/drivers/input/touchscreen/ts_filter_mean.c
index 291226e..a3c5f08 100644
--- a/drivers/input/touchscreen/ts_filter_mean.c
+++ b/drivers/input/touchscreen/ts_filter_mean.c
@@ -52,7 +52,7 @@ static void ts_filter_mean_clear(struct ts_filter *tsf);
static struct ts_filter *ts_filter_mean_create(
struct platform_device *pdev,
- struct ts_filter_configuration *conf,
+ const struct ts_filter_configuration *conf,
int count_coords)
{
struct ts_filter_mean *priv;
@@ -161,7 +161,7 @@ static void ts_filter_mean_scale(struct ts_filter *tsf, int *coords)
}
}
-struct ts_filter_api ts_filter_mean_api = {
+const struct ts_filter_api ts_filter_mean_api = {
.create = ts_filter_mean_create,
.destroy = ts_filter_mean_destroy,
.clear = ts_filter_mean_clear,
@@ -170,4 +170,5 @@ struct ts_filter_api ts_filter_mean_api = {
.haspoint = ts_filter_mean_haspoint,
.getpoint = ts_filter_mean_getpoint,
};
+EXPORT_SYMBOL_GPL(ts_filter_mean_api);
diff --git a/drivers/input/touchscreen/ts_filter_mean.h b/drivers/input/touchscreen/ts_filter_mean.h
index 7b3935f..f5b5e4b 100644
--- a/drivers/input/touchscreen/ts_filter_mean.h
+++ b/drivers/input/touchscreen/ts_filter_mean.h
@@ -23,6 +23,6 @@ struct ts_filter_mean_configuration {
};
/* API functions for the mean filter */
-extern struct ts_filter_api ts_filter_mean_api;
+extern const struct ts_filter_api ts_filter_mean_api;
#endif /* __TS_FILTER_MEAN_H__ */
diff --git a/drivers/input/touchscreen/ts_filter_median.c b/drivers/input/touchscreen/ts_filter_median.c
index 547ca8d..b8a6206 100644
--- a/drivers/input/touchscreen/ts_filter_median.c
+++ b/drivers/input/touchscreen/ts_filter_median.c
@@ -105,7 +105,7 @@ static void ts_filter_median_clear(struct ts_filter *tsf)
static struct ts_filter *ts_filter_median_create(
struct platform_device *pdev,
- struct ts_filter_configuration *conf,
+ const struct ts_filter_configuration *conf,
int count_coords)
{
int *p;
@@ -248,7 +248,7 @@ static void ts_filter_median_getpoint(struct ts_filter *tsf, int *point)
priv->ready = 0;
}
-struct ts_filter_api ts_filter_median_api = {
+const struct ts_filter_api ts_filter_median_api = {
.create = ts_filter_median_create,
.destroy = ts_filter_median_destroy,
.clear = ts_filter_median_clear,
@@ -257,3 +257,5 @@ struct ts_filter_api ts_filter_median_api = {
.haspoint = ts_filter_median_haspoint,
.getpoint = ts_filter_median_getpoint,
};
+EXPORT_SYMBOL_GPL(ts_filter_median_api);
+
diff --git a/drivers/input/touchscreen/ts_filter_median.h b/drivers/input/touchscreen/ts_filter_median.h
index 17a1ca6..1c19472 100644
--- a/drivers/input/touchscreen/ts_filter_median.h
+++ b/drivers/input/touchscreen/ts_filter_median.h
@@ -27,6 +27,6 @@ struct ts_filter_median_configuration {
struct ts_filter_configuration config;
};
-extern struct ts_filter_api ts_filter_median_api;
+extern const struct ts_filter_api ts_filter_median_api;
#endif
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