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192.168.1.100 / T108 / c2023d5d03be91dbb983606f0ec5e9e4ea36c8c2 / . / target / linux / ipq40xx / patches-5.4 / 100-GPIO-add-named-gpio-exports.patch
blob: a7f1a48bd947345c5bdf16bbd8f4105f416f59ce [file] [log] [blame]
b.liue9582032025-04-17 19:18:16 +0800[diff] [blame]1From 4267880319bc1a2270d352e0ded6d6386242a7ef Mon Sep 17 00:00:00 2001
2From: John Crispin <blogic@openwrt.org>
3Date: Tue, 12 Aug 2014 20:49:27 +0200
4Subject: [PATCH 24/53] GPIO: add named gpio exports
5
6Signed-off-by: John Crispin <blogic@openwrt.org>
7---
8 drivers/gpio/gpiolib-of.c | 68 +++++++++++++++++++++++++++++++++++++++++
9 drivers/gpio/gpiolib-sysfs.c | 10 +++++-
10 include/asm-generic/gpio.h | 6 ++++
11 include/linux/gpio/consumer.h | 8 +++++
12 4 files changed, 91 insertions(+), 1 deletion(-)
13
14--- a/drivers/gpio/gpiolib-of.c
15+++ b/drivers/gpio/gpiolib-of.c
16@@ -19,6 +19,8 @@
17 #include <linux/pinctrl/pinctrl.h>
18 #include <linux/slab.h>
19 #include <linux/gpio/machine.h>
20+#include <linux/init.h>
21+#include <linux/platform_device.h>
22
23 #include "gpiolib.h"
24 #include "gpiolib-of.h"
25@@ -917,3 +919,68 @@ void of_gpiochip_remove(struct gpio_chip
26 {
27 of_node_put(chip->of_node);
28 }
29+
30+static struct of_device_id gpio_export_ids[] = {
31+ { .compatible = "gpio-export" },
32+ { /* sentinel */ }
33+};
34+
35+static int of_gpio_export_probe(struct platform_device *pdev)
36+{
37+ struct device_node *np = pdev->dev.of_node;
38+ struct device_node *cnp;
39+ u32 val;
40+ int nb = 0;
41+
42+ for_each_child_of_node(np, cnp) {
43+ const char *name = NULL;
44+ int gpio;
45+ bool dmc;
46+ int max_gpio = 1;
47+ int i;
48+
49+ of_property_read_string(cnp, "gpio-export,name", &name);
50+
51+ if (!name)
52+ max_gpio = of_gpio_count(cnp);
53+
54+ for (i = 0; i < max_gpio; i++) {
55+ unsigned flags = 0;
56+ enum of_gpio_flags of_flags;
57+
58+ gpio = of_get_gpio_flags(cnp, i, &of_flags);
59+ if (!gpio_is_valid(gpio))
60+ return gpio;
61+
62+ if (of_flags == OF_GPIO_ACTIVE_LOW)
63+ flags |= GPIOF_ACTIVE_LOW;
64+
65+ if (!of_property_read_u32(cnp, "gpio-export,output", &val))
66+ flags |= val ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
67+ else
68+ flags |= GPIOF_IN;
69+
70+ if (devm_gpio_request_one(&pdev->dev, gpio, flags, name ? name : of_node_full_name(np)))
71+ continue;
72+
73+ dmc = of_property_read_bool(cnp, "gpio-export,direction_may_change");
74+ gpio_export_with_name(gpio, dmc, name);
75+ nb++;
76+ }
77+ }
78+
79+ dev_info(&pdev->dev, "%d gpio(s) exported\n", nb);
80+
81+ return 0;
82+}
83+
84+static struct platform_driver gpio_export_driver = {
85+ .driver = {
86+ .name = "gpio-export",
87+ .owner = THIS_MODULE,
88+ .of_match_table = of_match_ptr(gpio_export_ids),
89+ },
90+ .probe = of_gpio_export_probe,
91+};
92+
93+module_platform_driver(gpio_export_driver);
94--- a/drivers/gpio/gpiolib-sysfs.c
95+++ b/drivers/gpio/gpiolib-sysfs.c
96@@ -571,7 +571,7 @@ static struct class gpio_class = {
97 *
98 * Returns zero on success, else an error.
99 */
100-int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
101+int __gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name)
102 {
103 struct gpio_chip *chip;
104 struct gpio_device *gdev;
105@@ -633,6 +633,8 @@ int gpiod_export(struct gpio_desc *desc,
106 offset = gpio_chip_hwgpio(desc);
107 if (chip->names && chip->names[offset])
108 ioname = chip->names[offset];
109+ if (name)
110+ ioname = name;
111
112 dev = device_create_with_groups(&gpio_class, &gdev->dev,
113 MKDEV(0, 0), data, gpio_groups,
114@@ -654,6 +656,12 @@ err_unlock:
115 gpiod_dbg(desc, "%s: status %d\n", __func__, status);
116 return status;
117 }
118+EXPORT_SYMBOL_GPL(__gpiod_export);
119+
120+int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
121+{
122+ return __gpiod_export(desc, direction_may_change, NULL);
123+}
124 EXPORT_SYMBOL_GPL(gpiod_export);
125
126 static int match_export(struct device *dev, const void *desc)
127--- a/include/asm-generic/gpio.h
128+++ b/include/asm-generic/gpio.h
129@@ -127,6 +127,12 @@ static inline int gpio_export(unsigned g
130 return gpiod_export(gpio_to_desc(gpio), direction_may_change);
131 }
132
133+int __gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name);
134+static inline int gpio_export_with_name(unsigned gpio, bool direction_may_change, const char *name)
135+{
136+ return __gpiod_export(gpio_to_desc(gpio), direction_may_change, name);
137+}
138+
139 static inline int gpio_export_link(struct device *dev, const char *name,
140 unsigned gpio)
141 {
142--- a/include/linux/gpio/consumer.h
143+++ b/include/linux/gpio/consumer.h
144@@ -668,6 +668,7 @@ static inline void devm_acpi_dev_remove_
145
146 #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
147
148+int _gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name);
149 int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
150 int gpiod_export_link(struct device *dev, const char *name,
151 struct gpio_desc *desc);
152@@ -675,6 +676,13 @@ void gpiod_unexport(struct gpio_desc *de
153
154 #else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
155
156+static inline int _gpiod_export(struct gpio_desc *desc,
157+ bool direction_may_change,
158+ const char *name)
159+{
160+ return -ENOSYS;
161+}
162+
163 static inline int gpiod_export(struct gpio_desc *desc,
164 bool direction_may_change)
165 {