add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/gpio/gpio-twl4030.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0+
1
2
 /*
2
3
  * Access to GPIOs on TWL4030/TPS659x0 chips
3
4
  *
..
..
@@ -9,20 +10,6 @@
9
10
  *
10
11
  * Initial Code:
11
12
  *	Andy Lowe / Nishanth Menon
12
- *
13
- * This program is free software; you can redistribute it and/or modify
14
- * it under the terms of the GNU General Public License as published by
15
- * the Free Software Foundation; either version 2 of the License, or
16
- * (at your option) any later version.
17
- *
18
- * This program is distributed in the hope that it will be useful,
19
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
20
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21
- * GNU General Public License for more details.
22
- *
23
- * You should have received a copy of the GNU General Public License
24
- * along with this program; if not, write to the Free Software
25
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
26
13
  */
27
14
 
28
15
 #include <linux/module.h>
..
..
@@ -30,7 +17,7 @@
30
17
 #include <linux/interrupt.h>
31
18
 #include <linux/kthread.h>
32
19
 #include <linux/irq.h>
33
-#include <linux/gpio.h>
20
+#include <linux/gpio/driver.h>
34
21
 #include <linux/platform_device.h>
35
22
 #include <linux/of.h>
36
23
 #include <linux/irqdomain.h>
..
..
@@ -165,6 +152,23 @@
165
152
 		ret = gpio_twl4030_write(base, reg);
166
153
 	}
167
154
 	return ret;
155
+}
156
+
157
+static int twl4030_get_gpio_direction(int gpio)
158
+{
159
+	u8 d_bnk = gpio >> 3;
160
+	u8 d_msk = BIT(gpio & 0x7);
161
+	u8 base = REG_GPIODATADIR1 + d_bnk;
162
+	int ret = 0;
163
+
164
+	ret = gpio_twl4030_read(base);
165
+	if (ret < 0)
166
+		return ret;
167
+
168
+	if (ret & d_msk)
169
+		return GPIO_LINE_DIRECTION_OUT;
170
+
171
+	return GPIO_LINE_DIRECTION_IN;
168
172
 }
169
173
 
170
174
 static int twl4030_set_gpio_dataout(int gpio, int enable)
..
..
@@ -372,6 +376,28 @@
372
376
 	return ret;
373
377
 }
374
378
 
379
+static int twl_get_direction(struct gpio_chip *chip, unsigned offset)
380
+{
381
+	struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
382
+	/*
383
+	 * Default GPIO_LINE_DIRECTION_OUT
384
+	 * LED GPIOs >= TWL4030_GPIO_MAX are always output
385
+	 */
386
+	int ret = GPIO_LINE_DIRECTION_OUT;
387
+
388
+	mutex_lock(&priv->mutex);
389
+	if (offset < TWL4030_GPIO_MAX) {
390
+		ret = twl4030_get_gpio_direction(offset);
391
+		if (ret) {
392
+			mutex_unlock(&priv->mutex);
393
+			return ret;
394
+		}
395
+	}
396
+	mutex_unlock(&priv->mutex);
397
+
398
+	return ret;
399
+}
400
+
375
401
 static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
376
402
 {
377
403
 	struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
..
..
@@ -387,8 +413,9 @@
387
413
 	.request		= twl_request,
388
414
 	.free			= twl_free,
389
415
 	.direction_input	= twl_direction_in,
390
-	.get			= twl_get,
391
416
 	.direction_output	= twl_direction_out,
417
+	.get_direction		= twl_get_direction,
418
+	.get			= twl_get,
392
419
 	.set			= twl_set,
393
420
 	.to_irq			= twl_to_irq,
394
421
 	.can_sleep		= true,