target/linux/sunxi/patches-3.14/211-input-add-axp20x-power-enable-key-support.patch

   1 From 656b9ff9781aa3ffeb4231f32dfc545c92d04a12 Mon Sep 17 00:00:00 2001
   2 From: Carlo Caione <carlo@caione.org>
   3 Date: Sat, 1 Mar 2014 17:45:49 +0100
   4 Subject: [PATCH] input: misc: Add driver for AXP20x Power Enable Key
   5
   6 This patch add support for the Power Enable Key found on MFD AXP202 and
   7 AXP209. Besides the basic support for the button, the driver adds two
   8 entries in sysfs to configure the time delay for power on/off.
   9
  10 Signed-off-by: Carlo Caione <carlo@caione.org>
  11 ---
  12  arch/arm/configs/sunxi_defconfig |   2 +
  13  drivers/input/misc/Kconfig       |  11 ++
  14  drivers/input/misc/Makefile      |   1 +
  15  drivers/input/misc/axp20x-pek.c  | 265 +++++++++++++++++++++++++++++++++++++++
  16  4 files changed, 279 insertions(+)
  17  create mode 100644 drivers/input/misc/axp20x-pek.c
  18
  19 --- a/arch/arm/configs/sunxi_defconfig
  20 +++ b/arch/arm/configs/sunxi_defconfig
  21 @@ -40,6 +40,8 @@ CONFIG_SUN4I_EMAC=y
  22  # CONFIG_NET_VENDOR_STMICRO is not set
  23  # CONFIG_NET_VENDOR_WIZNET is not set
  24  # CONFIG_WLAN is not set
  25 +CONFIG_INPUT_MISC=y
  26 +CONFIG_INPUT_AXP20X_PEK=y
  27  CONFIG_SERIAL_8250=y
  28  CONFIG_SERIAL_8250_CONSOLE=y
  29  CONFIG_SERIAL_8250_NR_UARTS=8
  30 --- a/drivers/input/misc/Kconfig
  31 +++ b/drivers/input/misc/Kconfig
  32 @@ -393,6 +393,17 @@ config INPUT_RETU_PWRBUTTON
  33           To compile this driver as a module, choose M here. The module will
  34           be called retu-pwrbutton.
  35
  36 +config INPUT_AXP20X_PEK
  37 +       tristate "X-Powers AXP20X power button driver"
  38 +       depends on MFD_AXP20X
  39 +       help
  40 +         Say Y here if you want to enable power key reporting via the
  41 +         AXP20X PMIC.
  42 +
  43 +         To compile this driver as a module, choose M here. The module will
  44 +         be called axp20x-pek.
  45 +
  46 +
  47  config INPUT_TWL4030_PWRBUTTON
  48         tristate "TWL4030 Power button Driver"
  49         depends on TWL4030_CORE
  50 --- a/drivers/input/misc/Makefile
  51 +++ b/drivers/input/misc/Makefile
  52 @@ -50,6 +50,7 @@ obj-$(CONFIG_INPUT_POWERMATE)         += powerm
  53  obj-$(CONFIG_INPUT_PWM_BEEPER)         += pwm-beeper.o
  54  obj-$(CONFIG_INPUT_RB532_BUTTON)       += rb532_button.o
  55  obj-$(CONFIG_INPUT_RETU_PWRBUTTON)     += retu-pwrbutton.o
  56 +obj-$(CONFIG_INPUT_AXP20X_PEK)         += axp20x-pek.o
  57  obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER)        += rotary_encoder.o
  58  obj-$(CONFIG_INPUT_SGI_BTNS)           += sgi_btns.o
  59  obj-$(CONFIG_INPUT_SIRFSOC_ONKEY)      += sirfsoc-onkey.o
  60 --- /dev/null
  61 +++ b/drivers/input/misc/axp20x-pek.c
  62 @@ -0,0 +1,265 @@
  63 +/*
  64 + * axp20x power button driver.
  65 + *
  66 + * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
  67 + *
  68 + * This file is subject to the terms and conditions of the GNU General
  69 + * Public License. See the file "COPYING" in the main directory of this
  70 + * archive for more details.
  71 + *
  72 + * This program is distributed in the hope that it will be useful,
  73 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  74 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  75 + * GNU General Public License for more details.
  76 + */
  77 +
  78 +#include <linux/errno.h>
  79 +#include <linux/irq.h>
  80 +#include <linux/init.h>
  81 +#include <linux/input.h>
  82 +#include <linux/interrupt.h>
  83 +#include <linux/kernel.h>
  84 +#include <linux/mfd/axp20x.h>
  85 +#include <linux/module.h>
  86 +#include <linux/platform_device.h>
  87 +#include <linux/regmap.h>
  88 +#include <linux/slab.h>
  89 +
  90 +#define AXP20X_PEK_STARTUP_MASK                (0xc0)
  91 +#define AXP20X_PEK_SHUTDOWN_MASK       (0x03)
  92 +
  93 +static const char const *startup_time[] = { "128mS", "3S" , "1S", "2S" };
  94 +static const char const *shutdown_time[] = { "4S", "6S" , "8S", "10S" };
  95 +
  96 +struct axp20x_pek {
  97 +       struct axp20x_dev *axp20x;
  98 +       struct input_dev *input;
  99 +       int irq_dbr;
 100 +       int irq_dbf;
 101 +};
 102 +
 103 +struct axp20x_pek_ext_attr {
 104 +       const char const **str;
 105 +       unsigned int mask;
 106 +};
 107 +
 108 +static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
 109 +       .str    = startup_time,
 110 +       .mask   = AXP20X_PEK_STARTUP_MASK,
 111 +};
 112 +
 113 +static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
 114 +       .str    = shutdown_time,
 115 +       .mask   = AXP20X_PEK_SHUTDOWN_MASK,
 116 +};
 117 +
 118 +static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr)
 119 +{
 120 +       return container_of(attr, struct dev_ext_attribute, attr)->var;
 121 +}
 122 +
 123 +ssize_t axp20x_show_ext_attr(struct device *dev, struct device_attribute *attr,
 124 +                            char *buf)
 125 +{
 126 +       struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 127 +       struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
 128 +       unsigned int val;
 129 +       int ret, i;
 130 +       int cnt = 0;
 131 +
 132 +       ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
 133 +       if (ret != 0)
 134 +               return ret;
 135 +
 136 +       val &= axp20x_ea->mask;
 137 +       val >>= ffs(axp20x_ea->mask) - 1;
 138 +
 139 +       for (i = 0; i < 4; i++) {
 140 +               if (val == i)
 141 +                       cnt += sprintf(buf + cnt, "[%s] ", axp20x_ea->str[i]);
 142 +               else
 143 +                       cnt += sprintf(buf + cnt, "%s ", axp20x_ea->str[i]);
 144 +       }
 145 +
 146 +       cnt += sprintf(buf + cnt, "\n");
 147 +
 148 +       return cnt;
 149 +}
 150 +
 151 +ssize_t axp20x_store_ext_attr(struct device *dev, struct device_attribute *attr,
 152 +                             const char *buf, size_t count)
 153 +{
 154 +       struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 155 +       struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
 156 +       char val_str[20];
 157 +       int ret, i;
 158 +       size_t len;
 159 +
 160 +       val_str[sizeof(val_str) - 1] = '\0';
 161 +       strncpy(val_str, buf, sizeof(val_str) - 1);
 162 +       len = strlen(val_str);
 163 +
 164 +       if (len && val_str[len - 1] == '\n')
 165 +               val_str[len - 1] = '\0';
 166 +
 167 +       for (i = 0; i < 4; i++) {
 168 +               if (!strcmp(val_str, axp20x_ea->str[i])) {
 169 +                       ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
 170 +                                                AXP20X_PEK_KEY,
 171 +                                                axp20x_ea->mask, i);
 172 +                       if (ret != 0)
 173 +                               return -EINVAL;
 174 +                       return count;
 175 +               }
 176 +       }
 177 +
 178 +       return -EINVAL;
 179 +}
 180 +
 181 +static struct dev_ext_attribute axp20x_dev_attr_startup = {
 182 +       .attr   = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
 183 +       .var    = &axp20x_pek_startup_ext_attr
 184 +};
 185 +
 186 +static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
 187 +       __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
 188 +       &axp20x_pek_shutdown_ext_attr
 189 +};
 190 +
 191 +static struct attribute *dev_attrs[] = {
 192 +       &axp20x_dev_attr_startup.attr.attr,
 193 +       &axp20x_dev_attr_shutdown.attr.attr,
 194 +       NULL,
 195 +};
 196 +
 197 +static struct attribute_group dev_attr_group = {
 198 +       .attrs  = dev_attrs,
 199 +};
 200 +
 201 +static const struct attribute_group *dev_attr_groups[] = {
 202 +       &dev_attr_group,
 203 +       NULL,
 204 +};
 205 +
 206 +static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
 207 +{
 208 +       struct input_dev *idev = pwr;
 209 +       struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
 210 +
 211 +       if (irq == axp20x_pek->irq_dbr)
 212 +               input_report_key(idev, KEY_POWER, true);
 213 +       else if (irq == axp20x_pek->irq_dbf)
 214 +               input_report_key(idev, KEY_POWER, false);
 215 +
 216 +       input_sync(idev);
 217 +
 218 +       return IRQ_HANDLED;
 219 +}
 220 +
 221 +static int axp20x_pek_probe(struct platform_device *pdev)
 222 +{
 223 +       struct axp20x_pek *axp20x_pek;
 224 +       struct axp20x_dev *axp20x;
 225 +       struct input_dev *idev;
 226 +       int error;
 227 +
 228 +       axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
 229 +                                 GFP_KERNEL);
 230 +       if (!axp20x_pek)
 231 +               return -ENOMEM;
 232 +
 233 +       axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
 234 +       axp20x = axp20x_pek->axp20x;
 235 +
 236 +       axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
 237 +       if (axp20x_pek->irq_dbr < 0) {
 238 +               dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
 239 +                               axp20x_pek->irq_dbr);
 240 +               return axp20x_pek->irq_dbr;
 241 +       }
 242 +       axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
 243 +                                                 axp20x_pek->irq_dbr);
 244 +
 245 +       axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
 246 +       if (axp20x_pek->irq_dbf < 0) {
 247 +               dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
 248 +                               axp20x_pek->irq_dbf);
 249 +               return axp20x_pek->irq_dbf;
 250 +       }
 251 +       axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
 252 +                                                 axp20x_pek->irq_dbf);
 253 +
 254 +       axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
 255 +       if (!axp20x_pek->input)
 256 +               return -ENOMEM;
 257 +
 258 +       idev = axp20x_pek->input;
 259 +
 260 +       idev->name = "axp20x-pek";
 261 +       idev->phys = "m1kbd/input2";
 262 +       idev->dev.parent = &pdev->dev;
 263 +
 264 +       input_set_capability(idev, EV_KEY, KEY_POWER);
 265 +
 266 +       input_set_drvdata(idev, axp20x_pek);
 267 +
 268 +       error = devm_request_threaded_irq(&pdev->dev, axp20x_pek->irq_dbr,
 269 +                                         NULL, axp20x_pek_irq, 0,
 270 +                                         "axp20x-pek-dbr", idev);
 271 +       if (error) {
 272 +               dev_err(axp20x->dev, "Failed to request dbr IRQ#%d: %d\n",
 273 +                       axp20x_pek->irq_dbr, error);
 274 +
 275 +               return error;
 276 +       }
 277 +
 278 +       error = devm_request_threaded_irq(&pdev->dev, axp20x_pek->irq_dbf,
 279 +                                         NULL, axp20x_pek_irq, 0,
 280 +                                         "axp20x-pek-dbf", idev);
 281 +       if (error) {
 282 +               dev_err(axp20x->dev, "Failed to request dbf IRQ#%d: %d\n",
 283 +                       axp20x_pek->irq_dbf, error);
 284 +               return error;
 285 +       }
 286 +
 287 +       idev->dev.groups = dev_attr_groups;
 288 +       error = input_register_device(idev);
 289 +       if (error) {
 290 +               dev_err(axp20x->dev, "Can't register input device: %d\n", error);
 291 +               return error;
 292 +       }
 293 +
 294 +       platform_set_drvdata(pdev, axp20x_pek);
 295 +
 296 +       return 0;
 297 +}
 298 +
 299 +static int axp20x_pek_remove(struct platform_device *pdev)
 300 +{
 301 +       struct axp20x_pek *axp20x_pek = platform_get_drvdata(pdev);
 302 +
 303 +       input_unregister_device(axp20x_pek->input);
 304 +
 305 +       return 0;
 306 +}
 307 +
 308 +static const struct of_device_id axp20x_pek_match[] = {
 309 +       { .compatible = "x-powers,axp20x-pek", },
 310 +       { /* sentinel */ },
 311 +};
 312 +MODULE_DEVICE_TABLE(of, axp20x_pek_match);
 313 +
 314 +static struct platform_driver axp20x_pek_driver = {
 315 +       .probe          = axp20x_pek_probe,
 316 +       .remove         = axp20x_pek_remove,
 317 +       .driver         = {
 318 +               .name           = "axp20x-pek",
 319 +               .owner          = THIS_MODULE,
 320 +               .of_match_table = axp20x_pek_match,
 321 +       },
 322 +};
 323 +module_platform_driver(axp20x_pek_driver);
 324 +
 325 +MODULE_DESCRIPTION("axp20x Power Button");
 326 +MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 327 +MODULE_LICENSE("GPL");