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/pm_wakeirq.h>
  14 #include <linux/workqueue.h>
  15 #include <linux/regmap.h>
  16 #include <linux/of.h>
  17 #include <linux/mfd/da9063/core.h>
  18 #include <linux/mfd/da9063/registers.h>
  19 #include <linux/mfd/da9062/core.h>
  20 #include <linux/mfd/da9062/registers.h>
  21
  22 struct da906x_chip_config {
  23         /* REGS */
  24         int onkey_status;
  25         int onkey_pwr_signalling;
  26         int onkey_fault_log;
  27         int onkey_shutdown;
  28         /* MASKS */
  29         int onkey_nonkey_mask;
  30         int onkey_nonkey_lock_mask;
  31         int onkey_key_reset_mask;
  32         int onkey_shutdown_mask;
  33         /* NAMES */
  34         const char *name;
  35 };
  36
  37 struct da9063_onkey {
  38         struct delayed_work work;
  39         struct input_dev *input;
  40         struct device *dev;
  41         struct regmap *regmap;
  42         const struct da906x_chip_config *config;
  43         char phys[32];
  44         bool key_power;
  45 };
  46
  47 static const struct da906x_chip_config da9063_regs = {
  48         /* REGS */
  49         .onkey_status = DA9063_REG_STATUS_A,
  50         .onkey_pwr_signalling = DA9063_REG_CONTROL_B,
  51         .onkey_fault_log = DA9063_REG_FAULT_LOG,
  52         .onkey_shutdown = DA9063_REG_CONTROL_F,
  53         /* MASKS */
  54         .onkey_nonkey_mask = DA9063_NONKEY,
  55         .onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
  56         .onkey_key_reset_mask = DA9063_KEY_RESET,
  57         .onkey_shutdown_mask = DA9063_SHUTDOWN,
  58         /* NAMES */
  59         .name = DA9063_DRVNAME_ONKEY,
  60 };
  61
  62 static const struct da906x_chip_config da9062_regs = {
  63         /* REGS */
  64         .onkey_status = DA9062AA_STATUS_A,
  65         .onkey_pwr_signalling = DA9062AA_CONTROL_B,
  66         .onkey_fault_log = DA9062AA_FAULT_LOG,
  67         .onkey_shutdown = DA9062AA_CONTROL_F,
  68         /* MASKS */
  69         .onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
  70         .onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
  71         .onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
  72         .onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
  73         /* NAMES */
  74         .name = "da9062-onkey",
  75 };
  76
  77 static const struct of_device_id da9063_compatible_reg_id_table[] = {
  78         { .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
  79         { .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
  80         { },
  81 };
  82 MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
  83
  84 static void da9063_poll_on(struct work_struct *work)
  85 {
  86         struct da9063_onkey *onkey = container_of(work,
  87                                                 struct da9063_onkey,
  88                                                 work.work);
  89         const struct da906x_chip_config *config = onkey->config;
  90         unsigned int val;
  91         int fault_log = 0;
  92         bool poll = true;
  93         int error;
  94
  95         /* Poll to see when the pin is released */
  96         error = regmap_read(onkey->regmap,
  97                             config->onkey_status,
  98                             &val);
  99         if (error) {
 100                 dev_err(onkey->dev,
 101                         "Failed to read ON status: %d\n", error);
 102                 goto err_poll;
 103         }
 104
 105         if (!(val & config->onkey_nonkey_mask)) {
 106                 error = regmap_update_bits(onkey->regmap,
 107                                            config->onkey_pwr_signalling,
 108                                            config->onkey_nonkey_lock_mask,
 109                                            0);
 110                 if (error) {
 111                         dev_err(onkey->dev,
 112                                 "Failed to reset the Key Delay %d\n", error);
 113                         goto err_poll;
 114                 }
 115
 116                 input_report_key(onkey->input, KEY_POWER, 0);
 117                 input_sync(onkey->input);
 118
 119                 poll = false;
 120         }
 121
 122         /*
 123          * If the fault log KEY_RESET is detected, then clear it
 124          * and shut down the system.
 125          */
 126         error = regmap_read(onkey->regmap,
 127                             config->onkey_fault_log,
 128                             &fault_log);
 129         if (error) {
 130                 dev_warn(&onkey->input->dev,
 131                          "Cannot read FAULT_LOG: %d\n", error);
 132         } else if (fault_log & config->onkey_key_reset_mask) {
 133                 error = regmap_write(onkey->regmap,
 134                                      config->onkey_fault_log,
 135                                      config->onkey_key_reset_mask);
 136                 if (error) {
 137                         dev_warn(&onkey->input->dev,
 138                                  "Cannot reset KEY_RESET fault log: %d\n",
 139                                  error);
 140                 } else {
 141                         /* at this point we do any S/W housekeeping
 142                          * and then send shutdown command
 143                          */
 144                         dev_dbg(&onkey->input->dev,
 145                                 "Sending SHUTDOWN to PMIC ...\n");
 146                         error = regmap_write(onkey->regmap,
 147                                              config->onkey_shutdown,
 148                                              config->onkey_shutdown_mask);
 149                         if (error)
 150                                 dev_err(&onkey->input->dev,
 151                                         "Cannot SHUTDOWN PMIC: %d\n",
 152                                         error);
 153                 }
 154         }
 155
 156 err_poll:
 157         if (poll)
 158                 schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
 159 }
 160
 161 static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
 162 {
 163         struct da9063_onkey *onkey = data;
 164         const struct da906x_chip_config *config = onkey->config;
 165         unsigned int val;
 166         int error;
 167
 168         error = regmap_read(onkey->regmap,
 169                             config->onkey_status,
 170                             &val);
 171         if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
 172                 input_report_key(onkey->input, KEY_POWER, 1);
 173                 input_sync(onkey->input);
 174                 schedule_delayed_work(&onkey->work, 0);
 175                 dev_dbg(onkey->dev, "KEY_POWER long press.\n");
 176         } else {
 177                 input_report_key(onkey->input, KEY_POWER, 1);
 178                 input_sync(onkey->input);
 179                 input_report_key(onkey->input, KEY_POWER, 0);
 180                 input_sync(onkey->input);
 181                 dev_dbg(onkey->dev, "KEY_POWER short press.\n");
 182         }
 183
 184         return IRQ_HANDLED;
 185 }
 186
 187 static int da9063_onkey_probe(struct platform_device *pdev)
 188 {
 189         struct da9063_onkey *onkey;
 190         const struct of_device_id *match;
 191         int irq;
 192         int error;
 193
 194         match = of_match_node(da9063_compatible_reg_id_table,
 195                               pdev->dev.of_node);
 196         if (!match)
 197                 return -ENXIO;
 198
 199         onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
 200                              GFP_KERNEL);
 201         if (!onkey) {
 202                 dev_err(&pdev->dev, "Failed to allocate memory.\n");
 203                 return -ENOMEM;
 204         }
 205
 206         onkey->config = match->data;
 207         onkey->dev = &pdev->dev;
 208
 209         onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 210         if (!onkey->regmap) {
 211                 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
 212                 return -ENXIO;
 213         }
 214
 215         onkey->key_power = !of_property_read_bool(pdev->dev.of_node,
 216                                                   "dlg,disable-key-power");
 217
 218         onkey->input = devm_input_allocate_device(&pdev->dev);
 219         if (!onkey->input) {
 220                 dev_err(&pdev->dev, "Failed to allocated input device.\n");
 221                 return -ENOMEM;
 222         }
 223
 224         onkey->input->name = onkey->config->name;
 225         snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
 226                  onkey->config->name);
 227         onkey->input->phys = onkey->phys;
 228         onkey->input->dev.parent = &pdev->dev;
 229
 230         input_set_capability(onkey->input, EV_KEY, KEY_POWER);
 231
 232         error = devm_delayed_work_autocancel(&pdev->dev, &onkey->work,
 233                                              da9063_poll_on);
 234         if (error) {
 235                 dev_err(&pdev->dev,
 236                         "Failed to add cancel poll action: %d\n",
 237                         error);
 238                 return error;
 239         }
 240
 241         irq = platform_get_irq_byname(pdev, "ONKEY");
 242         if (irq < 0)
 243                 return irq;
 244
 245         error = devm_request_threaded_irq(&pdev->dev, irq,
 246                                           NULL, da9063_onkey_irq_handler,
 247                                           IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 248                                           "ONKEY", onkey);
 249         if (error) {
 250                 dev_err(&pdev->dev,
 251                         "Failed to request IRQ %d: %d\n", irq, error);
 252                 return error;
 253         }
 254
 255         error = dev_pm_set_wake_irq(&pdev->dev, irq);
 256         if (error)
 257                 dev_warn(&pdev->dev,
 258                          "Failed to set IRQ %d as a wake IRQ: %d\n",
 259                          irq, error);
 260         else
 261                 device_init_wakeup(&pdev->dev, true);
 262
 263         error = input_register_device(onkey->input);
 264         if (error) {
 265                 dev_err(&pdev->dev,
 266                         "Failed to register input device: %d\n", error);
 267                 return error;
 268         }
 269
 270         return 0;
 271 }
 272
 273 static struct platform_driver da9063_onkey_driver = {
 274         .probe  = da9063_onkey_probe,
 275         .driver = {
 276                 .name   = DA9063_DRVNAME_ONKEY,
 277                 .of_match_table = da9063_compatible_reg_id_table,
 278         },
 279 };
 280 module_platform_driver(da9063_onkey_driver);
 281
 282 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 283 MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
 284 MODULE_LICENSE("GPL");
 285 MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);