drivers/input/misc/axp20x-pek.c

   1 /*
   2  * axp20x power button driver.
   3  *
   4  * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
   5  *
   6  * This file is subject to the terms and conditions of the GNU General
   7  * Public License. See the file "COPYING" in the main directory of this
   8  * archive for more details.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/errno.h>
  17 #include <linux/irq.h>
  18 #include <linux/init.h>
  19 #include <linux/input.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/kernel.h>
  22 #include <linux/mfd/axp20x.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/regmap.h>
  26 #include <linux/slab.h>
  27
  28 #define AXP20X_PEK_STARTUP_MASK         (0xc0)
  29 #define AXP20X_PEK_SHUTDOWN_MASK        (0x03)
  30
  31 struct axp20x_pek {
  32         struct axp20x_dev *axp20x;
  33         struct input_dev *input;
  34         int irq_dbr;
  35         int irq_dbf;
  36 };
  37
  38 struct axp20x_time {
  39         unsigned int time;
  40         unsigned int idx;
  41 };
  42
  43 static const struct axp20x_time startup_time[] = {
  44         { .time = 128,  .idx = 0 },
  45         { .time = 1000, .idx = 2 },
  46         { .time = 3000, .idx = 1 },
  47         { .time = 2000, .idx = 3 },
  48 };
  49
  50 static const struct axp20x_time shutdown_time[] = {
  51         { .time = 4000,  .idx = 0 },
  52         { .time = 6000,  .idx = 1 },
  53         { .time = 8000,  .idx = 2 },
  54         { .time = 10000, .idx = 3 },
  55 };
  56
  57 struct axp20x_pek_ext_attr {
  58         const struct axp20x_time *p_time;
  59         unsigned int mask;
  60 };
  61
  62 static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
  63         .p_time = startup_time,
  64         .mask   = AXP20X_PEK_STARTUP_MASK,
  65 };
  66
  67 static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
  68         .p_time = shutdown_time,
  69         .mask   = AXP20X_PEK_SHUTDOWN_MASK,
  70 };
  71
  72 static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr)
  73 {
  74         return container_of(attr, struct dev_ext_attribute, attr)->var;
  75 }
  76
  77 static ssize_t axp20x_show_ext_attr(struct device *dev,
  78                                     struct device_attribute *attr, char *buf)
  79 {
  80         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
  81         struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
  82         unsigned int val;
  83         int ret, i;
  84
  85         ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
  86         if (ret != 0)
  87                 return ret;
  88
  89         val &= axp20x_ea->mask;
  90         val >>= ffs(axp20x_ea->mask) - 1;
  91
  92         for (i = 0; i < 4; i++)
  93                 if (val == axp20x_ea->p_time[i].idx)
  94                         val = axp20x_ea->p_time[i].time;
  95
  96         return sprintf(buf, "%u\n", val);
  97 }
  98
  99 static ssize_t axp20x_store_ext_attr(struct device *dev,
 100                                      struct device_attribute *attr,
 101                                      const char *buf, size_t count)
 102 {
 103         struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 104         struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
 105         char val_str[20];
 106         size_t len;
 107         int ret, i;
 108         unsigned int val, idx = 0;
 109         unsigned int best_err = UINT_MAX;
 110
 111         val_str[sizeof(val_str) - 1] = '\0';
 112         strncpy(val_str, buf, sizeof(val_str) - 1);
 113         len = strlen(val_str);
 114
 115         if (len && val_str[len - 1] == '\n')
 116                 val_str[len - 1] = '\0';
 117
 118         ret = kstrtouint(val_str, 10, &val);
 119         if (ret)
 120                 return ret;
 121
 122         for (i = 3; i >= 0; i--) {
 123                 unsigned int err;
 124
 125                 err = abs(axp20x_ea->p_time[i].time - val);
 126                 if (err < best_err) {
 127                         best_err = err;
 128                         idx = axp20x_ea->p_time[i].idx;
 129                 }
 130
 131                 if (!err)
 132                         break;
 133         }
 134
 135         idx <<= ffs(axp20x_ea->mask) - 1;
 136         ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
 137                                  AXP20X_PEK_KEY,
 138                                  axp20x_ea->mask, idx);
 139         if (ret != 0)
 140                 return -EINVAL;
 141
 142         return count;
 143 }
 144
 145 static struct dev_ext_attribute axp20x_dev_attr_startup = {
 146         .attr   = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
 147         .var    = &axp20x_pek_startup_ext_attr,
 148 };
 149
 150 static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
 151         .attr   = __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
 152         .var    = &axp20x_pek_shutdown_ext_attr,
 153 };
 154
 155 static struct attribute *axp20x_attributes[] = {
 156         &axp20x_dev_attr_startup.attr.attr,
 157         &axp20x_dev_attr_shutdown.attr.attr,
 158         NULL,
 159 };
 160
 161 static const struct attribute_group axp20x_attribute_group = {
 162         .attrs = axp20x_attributes,
 163 };
 164
 165 static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
 166 {
 167         struct input_dev *idev = pwr;
 168         struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
 169
 170         if (irq == axp20x_pek->irq_dbr)
 171                 input_report_key(idev, KEY_POWER, true);
 172         else if (irq == axp20x_pek->irq_dbf)
 173                 input_report_key(idev, KEY_POWER, false);
 174
 175         input_sync(idev);
 176
 177         return IRQ_HANDLED;
 178 }
 179
 180 static void axp20x_remove_sysfs_group(void *_data)
 181 {
 182         struct device *dev = _data;
 183
 184         sysfs_remove_group(&dev->kobj, &axp20x_attribute_group);
 185 }
 186
 187 static int axp20x_pek_probe(struct platform_device *pdev)
 188 {
 189         struct axp20x_pek *axp20x_pek;
 190         struct axp20x_dev *axp20x;
 191         struct input_dev *idev;
 192         int error;
 193
 194         axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
 195                                   GFP_KERNEL);
 196         if (!axp20x_pek)
 197                 return -ENOMEM;
 198
 199         axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
 200         axp20x = axp20x_pek->axp20x;
 201
 202         axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
 203         if (axp20x_pek->irq_dbr < 0) {
 204                 dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
 205                                 axp20x_pek->irq_dbr);
 206                 return axp20x_pek->irq_dbr;
 207         }
 208         axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
 209                                                   axp20x_pek->irq_dbr);
 210
 211         axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
 212         if (axp20x_pek->irq_dbf < 0) {
 213                 dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
 214                                 axp20x_pek->irq_dbf);
 215                 return axp20x_pek->irq_dbf;
 216         }
 217         axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
 218                                                   axp20x_pek->irq_dbf);
 219
 220         axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
 221         if (!axp20x_pek->input)
 222                 return -ENOMEM;
 223
 224         idev = axp20x_pek->input;
 225
 226         idev->name = "axp20x-pek";
 227         idev->phys = "m1kbd/input2";
 228         idev->dev.parent = &pdev->dev;
 229
 230         input_set_capability(idev, EV_KEY, KEY_POWER);
 231
 232         input_set_drvdata(idev, axp20x_pek);
 233
 234         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
 235                                              axp20x_pek_irq, 0,
 236                                              "axp20x-pek-dbr", idev);
 237         if (error < 0) {
 238                 dev_err(axp20x->dev, "Failed to request dbr IRQ#%d: %d\n",
 239                         axp20x_pek->irq_dbr, error);
 240                 return error;
 241         }
 242
 243         error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
 244                                           axp20x_pek_irq, 0,
 245                                           "axp20x-pek-dbf", idev);
 246         if (error < 0) {
 247                 dev_err(axp20x->dev, "Failed to request dbf IRQ#%d: %d\n",
 248                         axp20x_pek->irq_dbf, error);
 249                 return error;
 250         }
 251
 252         error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group);
 253         if (error) {
 254                 dev_err(axp20x->dev, "Failed to create sysfs attributes: %d\n",
 255                         error);
 256                 return error;
 257         }
 258
 259         error = devm_add_action(&pdev->dev,
 260                                 axp20x_remove_sysfs_group, &pdev->dev);
 261         if (error) {
 262                 axp20x_remove_sysfs_group(&pdev->dev);
 263                 dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n",
 264                         error);
 265                 return error;
 266         }
 267
 268         error = input_register_device(idev);
 269         if (error) {
 270                 dev_err(axp20x->dev, "Can't register input device: %d\n",
 271                         error);
 272                 return error;
 273         }
 274
 275         platform_set_drvdata(pdev, axp20x_pek);
 276
 277         return 0;
 278 }
 279
 280 static struct platform_driver axp20x_pek_driver = {
 281         .probe          = axp20x_pek_probe,
 282         .driver         = {
 283                 .name           = "axp20x-pek",
 284         },
 285 };
 286 module_platform_driver(axp20x_pek_driver);
 287
 288 MODULE_DESCRIPTION("axp20x Power Button");
 289 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 290 MODULE_LICENSE("GPL");