drivers/input/misc/da9063_onkey.c

   1 /*
   2  * OnKey device driver for DA9063 and DA9062 PMICs
   3  * Copyright (C) 2015  Dialog Semiconductor Ltd.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   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/module.h>
  17 #include <linux/errno.h>
  18 #include <linux/input.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/regmap.h>
  23 #include <linux/of.h>
  24 #include <linux/mfd/da9063/core.h>
  25 #include <linux/mfd/da9063/pdata.h>
  26 #include <linux/mfd/da9063/registers.h>
  27 #include <linux/mfd/da9062/core.h>
  28 #include <linux/mfd/da9062/registers.h>
  29
  30 struct da906x_chip_config {
  31         /* REGS */
  32         int onkey_status;
  33         int onkey_pwr_signalling;
  34         int onkey_fault_log;
  35         int onkey_shutdown;
  36         /* MASKS */
  37         int onkey_nonkey_mask;
  38         int onkey_nonkey_lock_mask;
  39         int onkey_key_reset_mask;
  40         int onkey_shutdown_mask;
  41         /* NAMES */
  42         const char *name;
  43 };
  44
  45 struct da9063_onkey {
  46         struct delayed_work work;
  47         struct input_dev *input;
  48         struct device *dev;
  49         struct regmap *regmap;
  50         const struct da906x_chip_config *config;
  51         char phys[32];
  52         bool key_power;
  53 };
  54
  55 static const struct da906x_chip_config da9063_regs = {
  56         /* REGS */
  57         .onkey_status = DA9063_REG_STATUS_A,
  58         .onkey_pwr_signalling = DA9063_REG_CONTROL_B,
  59         .onkey_fault_log = DA9063_REG_FAULT_LOG,
  60         .onkey_shutdown = DA9063_REG_CONTROL_F,
  61         /* MASKS */
  62         .onkey_nonkey_mask = DA9063_NONKEY,
  63         .onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
  64         .onkey_key_reset_mask = DA9063_KEY_RESET,
  65         .onkey_shutdown_mask = DA9063_SHUTDOWN,
  66         /* NAMES */
  67         .name = DA9063_DRVNAME_ONKEY,
  68 };
  69
  70 static const struct da906x_chip_config da9062_regs = {
  71         /* REGS */
  72         .onkey_status = DA9062AA_STATUS_A,
  73         .onkey_pwr_signalling = DA9062AA_CONTROL_B,
  74         .onkey_fault_log = DA9062AA_FAULT_LOG,
  75         .onkey_shutdown = DA9062AA_CONTROL_F,
  76         /* MASKS */
  77         .onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
  78         .onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
  79         .onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
  80         .onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
  81         /* NAMES */
  82         .name = "da9062-onkey",
  83 };
  84
  85 static const struct of_device_id da9063_compatible_reg_id_table[] = {
  86         { .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
  87         { .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
  88         { },
  89 };
  90
  91 static void da9063_poll_on(struct work_struct *work)
  92 {
  93         struct da9063_onkey *onkey = container_of(work,
  94                                                 struct da9063_onkey,
  95                                                 work.work);
  96         const struct da906x_chip_config *config = onkey->config;
  97         unsigned int val;
  98         int fault_log = 0;
  99         bool poll = true;
 100         int error;
 101
 102         /* Poll to see when the pin is released */
 103         error = regmap_read(onkey->regmap,
 104                             config->onkey_status,
 105                             &val);
 106         if (error) {
 107                 dev_err(onkey->dev,
 108                         "Failed to read ON status: %d\n", error);
 109                 goto err_poll;
 110         }
 111
 112         if (!(val & config->onkey_nonkey_mask)) {
 113                 error = regmap_update_bits(onkey->regmap,
 114                                            config->onkey_pwr_signalling,
 115                                            config->onkey_nonkey_lock_mask,
 116                                            0);
 117                 if (error) {
 118                         dev_err(onkey->dev,
 119                                 "Failed to reset the Key Delay %d\n", error);
 120                         goto err_poll;
 121                 }
 122
 123                 input_report_key(onkey->input, KEY_POWER, 0);
 124                 input_sync(onkey->input);
 125
 126                 poll = false;
 127         }
 128
 129         /*
 130          * If the fault log KEY_RESET is detected, then clear it
 131          * and shut down the system.
 132          */
 133         error = regmap_read(onkey->regmap,
 134                             config->onkey_fault_log,
 135                             &fault_log);
 136         if (error) {
 137                 dev_warn(&onkey->input->dev,
 138                          "Cannot read FAULT_LOG: %d\n", error);
 139         } else if (fault_log & config->onkey_key_reset_mask) {
 140                 error = regmap_write(onkey->regmap,
 141                                      config->onkey_fault_log,
 142                                      config->onkey_key_reset_mask);
 143                 if (error) {
 144                         dev_warn(&onkey->input->dev,
 145                                  "Cannot reset KEY_RESET fault log: %d\n",
 146                                  error);
 147                 } else {
 148                         /* at this point we do any S/W housekeeping
 149                          * and then send shutdown command
 150                          */
 151                         dev_dbg(&onkey->input->dev,
 152                                 "Sending SHUTDOWN to DA9063 ...\n");
 153                         error = regmap_write(onkey->regmap,
 154                                              config->onkey_shutdown,
 155                                              config->onkey_shutdown_mask);
 156                         if (error)
 157                                 dev_err(&onkey->input->dev,
 158                                         "Cannot SHUTDOWN DA9063: %d\n",
 159                                         error);
 160                 }
 161         }
 162
 163 err_poll:
 164         if (poll)
 165                 schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
 166 }
 167
 168 static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
 169 {
 170         struct da9063_onkey *onkey = data;
 171         const struct da906x_chip_config *config = onkey->config;
 172         unsigned int val;
 173         int error;
 174
 175         error = regmap_read(onkey->regmap,
 176                             config->onkey_status,
 177                             &val);
 178         if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
 179                 input_report_key(onkey->input, KEY_POWER, 1);
 180                 input_sync(onkey->input);
 181                 schedule_delayed_work(&onkey->work, 0);
 182                 dev_dbg(onkey->dev, "KEY_POWER long press.\n");
 183         } else {
 184                 input_report_key(onkey->input, KEY_POWER, 1);
 185                 input_sync(onkey->input);
 186                 input_report_key(onkey->input, KEY_POWER, 0);
 187                 input_sync(onkey->input);
 188                 dev_dbg(onkey->dev, "KEY_POWER short press.\n");
 189         }
 190
 191         return IRQ_HANDLED;
 192 }
 193
 194 static void da9063_cancel_poll(void *data)
 195 {
 196         struct da9063_onkey *onkey = data;
 197
 198         cancel_delayed_work_sync(&onkey->work);
 199 }
 200
 201 static int da9063_onkey_probe(struct platform_device *pdev)
 202 {
 203         struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
 204         struct da9063_pdata *pdata = dev_get_platdata(da9063->dev);
 205         struct da9063_onkey *onkey;
 206         const struct of_device_id *match;
 207         int irq;
 208         int error;
 209
 210         match = of_match_node(da9063_compatible_reg_id_table,
 211                               pdev->dev.of_node);
 212         if (!match)
 213                 return -ENXIO;
 214
 215         onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
 216                              GFP_KERNEL);
 217         if (!onkey) {
 218                 dev_err(&pdev->dev, "Failed to allocate memory.\n");
 219                 return -ENOMEM;
 220         }
 221
 222         onkey->config = match->data;
 223         onkey->dev = &pdev->dev;
 224
 225         onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 226         if (!onkey->regmap) {
 227                 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
 228                 return -ENXIO;
 229         }
 230
 231         if (pdata)
 232                 onkey->key_power = pdata->key_power;
 233         else
 234                 onkey->key_power =
 235                         !of_property_read_bool(pdev->dev.of_node,
 236                                                "dlg,disable-key-power");
 237
 238         onkey->input = devm_input_allocate_device(&pdev->dev);
 239         if (!onkey->input) {
 240                 dev_err(&pdev->dev, "Failed to allocated input device.\n");
 241                 return -ENOMEM;
 242         }
 243
 244         onkey->input->name = onkey->config->name;
 245         snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
 246                  onkey->config->name);
 247         onkey->input->phys = onkey->phys;
 248         onkey->input->dev.parent = &pdev->dev;
 249
 250         if (onkey->key_power)
 251                 input_set_capability(onkey->input, EV_KEY, KEY_POWER);
 252
 253         input_set_capability(onkey->input, EV_KEY, KEY_SLEEP);
 254
 255         INIT_DELAYED_WORK(&onkey->work, da9063_poll_on);
 256
 257         error = devm_add_action(&pdev->dev, da9063_cancel_poll, onkey);
 258         if (error) {
 259                 dev_err(&pdev->dev,
 260                         "Failed to add cancel poll action: %d\n",
 261                         error);
 262                 return error;
 263         }
 264
 265         irq = platform_get_irq_byname(pdev, "ONKEY");
 266         if (irq < 0) {
 267                 error = irq;
 268                 dev_err(&pdev->dev, "Failed to get platform IRQ: %d\n", error);
 269                 return error;
 270         }
 271
 272         error = devm_request_threaded_irq(&pdev->dev, irq,
 273                                           NULL, da9063_onkey_irq_handler,
 274                                           IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 275                                           "ONKEY", onkey);
 276         if (error) {
 277                 dev_err(&pdev->dev,
 278                         "Failed to request IRQ %d: %d\n", irq, error);
 279                 return error;
 280         }
 281
 282         error = input_register_device(onkey->input);
 283         if (error) {
 284                 dev_err(&pdev->dev,
 285                         "Failed to register input device: %d\n", error);
 286                 return error;
 287         }
 288
 289         platform_set_drvdata(pdev, onkey);
 290         return 0;
 291 }
 292
 293 static struct platform_driver da9063_onkey_driver = {
 294         .probe  = da9063_onkey_probe,
 295         .driver = {
 296                 .name   = DA9063_DRVNAME_ONKEY,
 297                 .of_match_table = da9063_compatible_reg_id_table,
 298         },
 299 };
 300 module_platform_driver(da9063_onkey_driver);
 301
 302 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 303 MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063 and DA9062");
 304 MODULE_LICENSE("GPL");
 305 MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);