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); 306