ath79: add support for TP-Link Archer C60 v3
[oweals/openwrt.git] / target / linux / ath79 / patches-5.4 / 0036-GPIO-add-named-gpio-exports.patch
1 From 4267880319bc1a2270d352e0ded6d6386242a7ef Mon Sep 17 00:00:00 2001
2 From: John Crispin <blogic@openwrt.org>
3 Date: Tue, 12 Aug 2014 20:49:27 +0200
4 Subject: [PATCH 24/53] GPIO: add named gpio exports
5
6 Signed-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 @@ -915,3 +917,68 @@ 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 @@ -563,7 +563,7 @@ 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 @@ -625,6 +625,8 @@ 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 @@ -646,6 +648,12 @@ 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  {