target/linux/ramips/patches-4.9/0024-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 @@ -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 @@ -538,3 +540,69 @@ void of_gpiochip_remove(struct gpio_chip
  26         gpiochip_remove_pin_ranges(chip);
  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 __init 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 +
  60 +                       if (of_flags == OF_GPIO_ACTIVE_LOW)
  61 +                               flags |= GPIOF_ACTIVE_LOW;
  62 +
  63 +                       if (!of_property_read_u32(cnp, "gpio-export,output", &val))
  64 +                               flags |= val ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
  65 +                       else
  66 +                               flags |= GPIOF_IN;
  67 +
  68 +                       if (devm_gpio_request_one(&pdev->dev, gpio, flags, name ? name : of_node_full_name(np)))
  69 +                               continue;
  70 +
  71 +                       dmc = of_property_read_bool(cnp, "gpio-export,direction_may_change");
  72 +                       gpio_export_with_name(gpio, dmc, name);
  73 +                       nb++;
  74 +               }
  75 +       }
  76 +
  77 +       dev_info(&pdev->dev, "%d gpio(s) exported\n", nb);
  78 +
  79 +       return 0;
  80 +}
  81 +
  82 +static struct platform_driver gpio_export_driver = {
  83 +       .driver         = {
  84 +               .name           = "gpio-export",
  85 +               .owner  = THIS_MODULE,
  86 +               .of_match_table = of_match_ptr(gpio_export_ids),
  87 +       },
  88 +};
  89 +
  90 +static int __init of_gpio_export_init(void)
  91 +{
  92 +       return platform_driver_probe(&gpio_export_driver, of_gpio_export_probe);
  93 +}
  94 +device_initcall(of_gpio_export_init);
  95 --- a/drivers/gpio/gpiolib-sysfs.c
  96 +++ b/drivers/gpio/gpiolib-sysfs.c
  97 @@ -544,7 +544,7 @@ static struct class gpio_class = {
  98   *
  99   * Returns zero on success, else an error.
 100   */
 101 -int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
 102 +int __gpiod_export(struct gpio_desc *desc, bool direction_may_change, const char *name)
 103  {
 104         struct gpio_chip        *chip;
 105         struct gpio_device      *gdev;
 106 @@ -606,6 +606,8 @@ int gpiod_export(struct gpio_desc *desc,
 107         offset = gpio_chip_hwgpio(desc);
 108         if (chip->names && chip->names[offset])
 109                 ioname = chip->names[offset];
 110 +       if (name)
 111 +               ioname = name;
 112
 113         dev = device_create_with_groups(&gpio_class, &gdev->dev,
 114                                         MKDEV(0, 0), data, gpio_groups,
 115 @@ -627,6 +629,12 @@ err_unlock:
 116         gpiod_dbg(desc, "%s: status %d\n", __func__, status);
 117         return status;
 118  }
 119 +EXPORT_SYMBOL_GPL(__gpiod_export);
 120 +
 121 +int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
 122 +{
 123 +       return __gpiod_export(desc, direction_may_change, NULL);
 124 +}
 125  EXPORT_SYMBOL_GPL(gpiod_export);
 126
 127  static int match_export(struct device *dev, const void *desc)
 128 --- a/include/asm-generic/gpio.h
 129 +++ b/include/asm-generic/gpio.h
 130 @@ -126,6 +126,11 @@ static inline int gpio_export(unsigned g
 131         return gpiod_export(gpio_to_desc(gpio), direction_may_change);
 132  }
 133
 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 @@ -434,6 +435,13 @@ void gpiod_unexport(struct gpio_desc *de
 145
 146  #else  /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
 147
 148 +static inline int _gpiod_export(struct gpio_desc *desc,
 149 +                                bool direction_may_change,
 150 +                                const char *name)
 151 +{
 152 +       return -ENOSYS;
 153 +}
 154 +
 155  static inline int gpiod_export(struct gpio_desc *desc,
 156                                bool direction_may_change)
 157  {