drivers/input/misc/da9063_onkey.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * OnKey device driver for DA9063, DA9062 and DA9061 PMICs
   4  * Copyright (C) 2015  Dialog Semiconductor Ltd.
   5  */
   6
   7 #include <linux/devm-helpers.h>
   8 #include <linux/module.h>
   9 #include <linux/errno.h>
  10 #include <linux/input.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/workqueue.h>
  14 #include <linux/regmap.h>
  15 #include <linux/of.h>
  16 #include <linux/mfd/da9063/core.h>
  17 #include <linux/mfd/da9063/registers.h>
  18 #include <linux/mfd/da9062/core.h>
  19 #include <linux/mfd/da9062/registers.h>
  20
  21 struct da906x_chip_config {
  22         /* REGS */
  23         int onkey_status;
  24         int onkey_pwr_signalling;
  25         int onkey_fault_log;
  26         int onkey_shutdown;
  27         /* MASKS */
  28         int onkey_nonkey_mask;
  29         int onkey_nonkey_lock_mask;
  30         int onkey_key_reset_mask;
  31         int onkey_shutdown_mask;
  32         /* NAMES */
  33         const char *name;
  34 };
  35
  36 struct da9063_onkey {
  37         struct delayed_work work;
  38         struct input_dev *input;
  39         struct device *dev;
  40         struct regmap *regmap;
  41         const struct da906x_chip_config *config;
  42         char phys[32];
  43         bool key_power;
  44 };
  45
  46 static const struct da906x_chip_config da9063_regs = {
  47         /* REGS */
  48         .onkey_status = DA9063_REG_STATUS_A,
  49         .onkey_pwr_signalling = DA9063_REG_CONTROL_B,
  50         .onkey_fault_log = DA9063_REG_FAULT_LOG,
  51         .onkey_shutdown = DA9063_REG_CONTROL_F,
  52         /* MASKS */
  53         .onkey_nonkey_mask = DA9063_NONKEY,
  54         .onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
  55         .onkey_key_reset_mask = DA9063_KEY_RESET,
  56         .onkey_shutdown_mask = DA9063_SHUTDOWN,
  57         /* NAMES */
  58         .name = DA9063_DRVNAME_ONKEY,
  59 };
  60
  61 static const struct da906x_chip_config da9062_regs = {
  62         /* REGS */
  63         .onkey_status = DA9062AA_STATUS_A,
  64         .onkey_pwr_signalling = DA9062AA_CONTROL_B,
  65         .onkey_fault_log = DA9062AA_FAULT_LOG,
  66         .onkey_shutdown = DA9062AA_CONTROL_F,
  67         /* MASKS */
  68         .onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
  69         .onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
  70         .onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
  71         .onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
  72         /* NAMES */
  73         .name = "da9062-onkey",
  74 };
  75
  76 static const struct of_device_id da9063_compatible_reg_id_table[] = {
  77         { .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
  78         { .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
  79         { },
  80 };
  81 MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
  82
  83 static void da9063_poll_on(struct work_struct *work)
  84 {
  85         struct da9063_onkey *onkey = container_of(work,
  86                                                 struct da9063_onkey,
  87                                                 work.work);
  88         const struct da906x_chip_config *config = onkey->config;
  89         unsigned int val;
  90         int fault_log = 0;
  91         bool poll = true;
  92         int error;
  93
  94         /* Poll to see when the pin is released */
  95         error = regmap_read(onkey->regmap,
  96                             config->onkey_status,
  97                             &val);
  98         if (error) {
  99                 dev_err(onkey->dev,
 100                         "Failed to read ON status: %d\n", error);
 101                 goto err_poll;
 102         }
 103
 104         if (!(val & config->onkey_nonkey_mask)) {
 105                 error = regmap_update_bits(onkey->regmap,
 106                                            config->onkey_pwr_signalling,
 107                                            config->onkey_nonkey_lock_mask,
 108                                            0);
 109                 if (error) {
 110                         dev_err(onkey->dev,
 111                                 "Failed to reset the Key Delay %d\n", error);
 112                         goto err_poll;
 113                 }
 114
 115                 input_report_key(onkey->input, KEY_POWER, 0);
 116                 input_sync(onkey->input);
 117
 118                 poll = false;
 119         }
 120
 121         /*
 122          * If the fault log KEY_RESET is detected, then clear it
 123          * and shut down the system.
 124          */
 125         error = regmap_read(onkey->regmap,
 126                             config->onkey_fault_log,
 127                             &fault_log);
 128         if (error) {
 129                 dev_warn(&onkey->input->dev,
 130                          "Cannot read FAULT_LOG: %d\n", error);
 131         } else if (fault_log & config->onkey_key_reset_mask) {
 132                 error = regmap_write(onkey->regmap,
 133                                      config->onkey_fault_log,
 134                                      config->onkey_key_reset_mask);
 135                 if (error) {
 136                         dev_warn(&onkey->input->dev,
 137                                  "Cannot reset KEY_RESET fault log: %d\n",
 138                                  error);
 139                 } else {
 140                         /* at this point we do any S/W housekeeping
 141                          * and then send shutdown command
 142                          */
 143                         dev_dbg(&onkey->input->dev,
 144                                 "Sending SHUTDOWN to PMIC ...\n");
 145                         error = regmap_write(onkey->regmap,
 146                                              config->onkey_shutdown,
 147                                              config->onkey_shutdown_mask);
 148                         if (error)
 149                                 dev_err(&onkey->input->dev,
 150                                         "Cannot SHUTDOWN PMIC: %d\n",
 151                                         error);
 152                 }
 153         }
 154
 155 err_poll:
 156         if (poll)
 157                 schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
 158 }
 159
 160 static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
 161 {
 162         struct da9063_onkey *onkey = data;
 163         const struct da906x_chip_config *config = onkey->config;
 164         unsigned int val;
 165         int error;
 166
 167         error = regmap_read(onkey->regmap,
 168                             config->onkey_status,
 169                             &val);
 170         if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
 171                 input_report_key(onkey->input, KEY_POWER, 1);
 172                 input_sync(onkey->input);
 173                 schedule_delayed_work(&onkey->work, 0);
 174                 dev_dbg(onkey->dev, "KEY_POWER long press.\n");
 175         } else {
 176                 input_report_key(onkey->input, KEY_POWER, 1);
 177                 input_sync(onkey->input);
 178                 input_report_key(onkey->input, KEY_POWER, 0);
 179                 input_sync(onkey->input);
 180                 dev_dbg(onkey->dev, "KEY_POWER short press.\n");
 181         }
 182
 183         return IRQ_HANDLED;
 184 }
 185
 186 static int da9063_onkey_probe(struct platform_device *pdev)
 187 {
 188         struct da9063_onkey *onkey;
 189         const struct of_device_id *match;
 190         int irq;
 191         int error;
 192
 193         match = of_match_node(da9063_compatible_reg_id_table,
 194                               pdev->dev.of_node);
 195         if (!match)
 196                 return -ENXIO;
 197
 198         onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
 199                              GFP_KERNEL);
 200         if (!onkey) {
 201                 dev_err(&pdev->dev, "Failed to allocate memory.\n");
 202                 return -ENOMEM;
 203         }
 204
 205         onkey->config = match->data;
 206         onkey->dev = &pdev->dev;
 207
 208         onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 209         if (!onkey->regmap) {
 210                 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
 211                 return -ENXIO;
 212         }
 213
 214         onkey->key_power = !of_property_read_bool(pdev->dev.of_node,
 215                                                   "dlg,disable-key-power");
 216
 217         onkey->input = devm_input_allocate_device(&pdev->dev);
 218         if (!onkey->input) {
 219                 dev_err(&pdev->dev, "Failed to allocated input device.\n");
 220                 return -ENOMEM;
 221         }
 222
 223         onkey->input->name = onkey->config->name;
 224         snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
 225                  onkey->config->name);
 226         onkey->input->phys = onkey->phys;
 227         onkey->input->dev.parent = &pdev->dev;
 228
 229         input_set_capability(onkey->input, EV_KEY, KEY_POWER);
 230
 231         error = devm_delayed_work_autocancel(&pdev->dev, &onkey->work,
 232                                              da9063_poll_on);
 233         if (error) {
 234                 dev_err(&pdev->dev,
 235                         "Failed to add cancel poll action: %d\n",
 236                         error);
 237                 return error;
 238         }
 239
 240         irq = platform_get_irq_byname(pdev, "ONKEY");
 241         if (irq < 0)
 242                 return irq;
 243
 244         error = devm_request_threaded_irq(&pdev->dev, irq,
 245                                           NULL, da9063_onkey_irq_handler,
 246                                           IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 247                                           "ONKEY", onkey);
 248         if (error) {
 249                 dev_err(&pdev->dev,
 250                         "Failed to request IRQ %d: %d\n", irq, error);
 251                 return error;
 252         }
 253
 254         error = input_register_device(onkey->input);
 255         if (error) {
 256                 dev_err(&pdev->dev,
 257                         "Failed to register input device: %d\n", error);
 258                 return error;
 259         }
 260
 261         return 0;
 262 }
 263
 264 static struct platform_driver da9063_onkey_driver = {
 265         .probe  = da9063_onkey_probe,
 266         .driver = {
 267                 .name   = DA9063_DRVNAME_ONKEY,
 268                 .of_match_table = da9063_compatible_reg_id_table,
 269         },
 270 };
 271 module_platform_driver(da9063_onkey_driver);
 272
 273 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 274 MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
 275 MODULE_LICENSE("GPL");
 276 MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);