lantiq: split base-files into subtargets
[oweals/openwrt.git] / target / linux / lantiq / patches-4.19 / 0030-GPIO-add-named-gpio-exports.patch
1 From cc809a441d8f2924f785eb863dfa6aef47a25b0b 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 30/36] 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.c        |   11 +++++--
10  include/asm-generic/gpio.h    |    5 +++
11  include/linux/gpio/consumer.h |    8 +++++
12  4 files changed, 90 insertions(+), 2 deletions(-)
13
14 --- a/drivers/gpio/gpiolib-of.c
15 +++ b/drivers/gpio/gpiolib-of.c
16 @@ -23,6 +23,8 @@
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  
25 @@ -660,3 +662,72 @@ void of_gpiochip_remove(struct gpio_chip
26         gpiochip_remove_pin_ranges(chip);
27         of_node_put(chip->of_node);
28  }
29 +
30 +#ifdef CONFIG_GPIO_SYSFS
31 +
32 +static struct of_device_id gpio_export_ids[] = {
33 +       { .compatible = "gpio-export" },
34 +       { /* sentinel */ }
35 +};
36 +
37 +static int of_gpio_export_probe(struct platform_device *pdev)
38 +{
39 +       struct device_node *np = pdev->dev.of_node;
40 +       struct device_node *cnp;
41 +       u32 val;
42 +       int nb = 0;
43 +
44 +       for_each_child_of_node(np, cnp) {
45 +               const char *name = NULL;
46 +               int gpio;
47 +               bool dmc;
48 +               int max_gpio = 1;
49 +               int i;
50 +
51 +               of_property_read_string(cnp, "gpio-export,name", &name);
52 +
53 +               if (!name)
54 +                       max_gpio = of_gpio_count(cnp);
55 +
56 +               for (i = 0; i < max_gpio; i++) {
57 +                       unsigned flags = 0;
58 +                       enum of_gpio_flags of_flags;
59 +
60 +                       gpio = of_get_gpio_flags(cnp, i, &of_flags);
61 +                       if (!gpio_is_valid(gpio))
62 +                               return gpio;
63 +
64 +                       if (of_flags == OF_GPIO_ACTIVE_LOW)
65 +                               flags |= GPIOF_ACTIVE_LOW;
66 +
67 +                       if (!of_property_read_u32(cnp, "gpio-export,output", &val))
68 +                               flags |= val ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
69 +                       else
70 +                               flags |= GPIOF_IN;
71 +
72 +                       if (devm_gpio_request_one(&pdev->dev, gpio, flags, name ? name : of_node_full_name(np)))
73 +                               continue;
74 +
75 +                       dmc = of_property_read_bool(cnp, "gpio-export,direction_may_change");
76 +                       gpio_export_with_name(gpio, dmc, name);
77 +                       nb++;
78 +               }
79 +       }
80 +
81 +       dev_info(&pdev->dev, "%d gpio(s) exported\n", nb);
82 +
83 +       return 0;
84 +}
85 +
86 +static struct platform_driver gpio_export_driver = {
87 +       .driver         = {
88 +               .name           = "gpio-export",
89 +               .owner  = THIS_MODULE,
90 +               .of_match_table = of_match_ptr(gpio_export_ids),
91 +       },
92 +       .probe          = of_gpio_export_probe,
93 +};
94 +
95 +module_platform_driver(gpio_export_driver);
96 +
97 +#endif
98 --- a/include/asm-generic/gpio.h
99 +++ b/include/asm-generic/gpio.h
100 @@ -127,6 +127,12 @@ static inline int gpio_export(unsigned g
101         return gpiod_export(gpio_to_desc(gpio), direction_may_change);
102  }
103  
104 +int __gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name);
105 +static inline int gpio_export_with_name(unsigned gpio, bool direction_may_change, const char *name)
106 +{
107 +       return __gpiod_export(gpio_to_desc(gpio), direction_may_change, name);
108 +}
109 +
110  static inline int gpio_export_link(struct device *dev, const char *name,
111                                    unsigned gpio)
112  {
113 --- a/include/linux/gpio/consumer.h
114 +++ b/include/linux/gpio/consumer.h
115 @@ -533,6 +533,7 @@ struct gpio_desc *devm_fwnode_get_gpiod_
116  
117  #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
118  
119 +int _gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name);
120  int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
121  int gpiod_export_link(struct device *dev, const char *name,
122                       struct gpio_desc *desc);
123 @@ -540,6 +541,13 @@ void gpiod_unexport(struct gpio_desc *de
124  
125  #else  /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
126  
127 +static inline int _gpiod_export(struct gpio_desc *desc,
128 +                              bool direction_may_change,
129 +                              const char *name)
130 +{
131 +       return -ENOSYS;
132 +}
133 +
134  static inline int gpiod_export(struct gpio_desc *desc,
135                                bool direction_may_change)
136  {
137 --- a/drivers/gpio/gpiolib-sysfs.c
138 +++ b/drivers/gpio/gpiolib-sysfs.c
139 @@ -568,7 +568,7 @@ static struct class gpio_class = {
140   *
141   * Returns zero on success, else an error.
142   */
143 -int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
144 +int __gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name)
145  {
146         struct gpio_chip        *chip;
147         struct gpio_device      *gdev;
148 @@ -630,6 +630,8 @@ int gpiod_export(struct gpio_desc *desc,
149         offset = gpio_chip_hwgpio(desc);
150         if (chip->names && chip->names[offset])
151                 ioname = chip->names[offset];
152 +       if (name)
153 +               ioname = name;
154  
155         dev = device_create_with_groups(&gpio_class, &gdev->dev,
156                                         MKDEV(0, 0), data, gpio_groups,
157 @@ -651,6 +653,12 @@ err_unlock:
158         gpiod_dbg(desc, "%s: status %d\n", __func__, status);
159         return status;
160  }
161 +EXPORT_SYMBOL_GPL(__gpiod_export);
162 +
163 +int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
164 +{
165 +       return __gpiod_export(desc, direction_may_change, NULL);
166 +}
167  EXPORT_SYMBOL_GPL(gpiod_export);
168  
169  static int match_export(struct device *dev, const void *desc)