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