1 /* 2 * OnKey device driver for DA9063 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 28 struct da9063_onkey { 29 struct da9063 *hw; 30 struct delayed_work work; 31 struct input_dev *input; 32 struct device *dev; 33 bool key_power; 34 }; 35 36 static void da9063_poll_on(struct work_struct *work) 37 { 38 struct da9063_onkey *onkey = container_of(work, struct da9063_onkey, 39 work.work); 40 unsigned int val; 41 int fault_log = 0; 42 bool poll = true; 43 int error; 44 45 /* Poll to see when the pin is released */ 46 error = regmap_read(onkey->hw->regmap, DA9063_REG_STATUS_A, &val); 47 if (error) { 48 dev_err(onkey->dev, 49 "Failed to read ON status: %d\n", error); 50 goto err_poll; 51 } 52 53 if (!(val & DA9063_NONKEY)) { 54 error = regmap_update_bits(onkey->hw->regmap, 55 DA9063_REG_CONTROL_B, 56 DA9063_NONKEY_LOCK, 0); 57 if (error) { 58 dev_err(onkey->dev, 59 "Failed to reset the Key Delay %d\n", error); 60 goto err_poll; 61 } 62 63 input_report_key(onkey->input, KEY_POWER, 0); 64 input_sync(onkey->input); 65 66 poll = false; 67 } 68 69 /* 70 * If the fault log KEY_RESET is detected, then clear it 71 * and shut down the system. 72 */ 73 error = regmap_read(onkey->hw->regmap, 74 DA9063_REG_FAULT_LOG, &fault_log); 75 if (error) { 76 dev_warn(&onkey->input->dev, 77 "Cannot read FAULT_LOG: %d\n", error); 78 } else if (fault_log & DA9063_KEY_RESET) { 79 error = regmap_write(onkey->hw->regmap, 80 DA9063_REG_FAULT_LOG, 81 DA9063_KEY_RESET); 82 if (error) { 83 dev_warn(&onkey->input->dev, 84 "Cannot reset KEY_RESET fault log: %d\n", 85 error); 86 } else { 87 /* at this point we do any S/W housekeeping 88 * and then send shutdown command 89 */ 90 dev_dbg(&onkey->input->dev, 91 "Sending SHUTDOWN to DA9063 ...\n"); 92 error = regmap_write(onkey->hw->regmap, 93 DA9063_REG_CONTROL_F, 94 DA9063_SHUTDOWN); 95 if (error) 96 dev_err(&onkey->input->dev, 97 "Cannot SHUTDOWN DA9063: %d\n", 98 error); 99 } 100 } 101 102 err_poll: 103 if (poll) 104 schedule_delayed_work(&onkey->work, msecs_to_jiffies(50)); 105 } 106 107 static irqreturn_t da9063_onkey_irq_handler(int irq, void *data) 108 { 109 struct da9063_onkey *onkey = data; 110 unsigned int val; 111 int error; 112 113 error = regmap_read(onkey->hw->regmap, DA9063_REG_STATUS_A, &val); 114 if (onkey->key_power && !error && (val & DA9063_NONKEY)) { 115 input_report_key(onkey->input, KEY_POWER, 1); 116 input_sync(onkey->input); 117 schedule_delayed_work(&onkey->work, 0); 118 dev_dbg(onkey->dev, "KEY_POWER pressed.\n"); 119 } else { 120 input_report_key(onkey->input, KEY_SLEEP, 1); 121 input_sync(onkey->input); 122 input_report_key(onkey->input, KEY_SLEEP, 0); 123 input_sync(onkey->input); 124 dev_dbg(onkey->dev, "KEY_SLEEP pressed.\n"); 125 } 126 127 return IRQ_HANDLED; 128 } 129 130 static void da9063_cancel_poll(void *data) 131 { 132 struct da9063_onkey *onkey = data; 133 134 cancel_delayed_work_sync(&onkey->work); 135 } 136 137 static int da9063_onkey_probe(struct platform_device *pdev) 138 { 139 struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent); 140 struct da9063_pdata *pdata = dev_get_platdata(da9063->dev); 141 struct da9063_onkey *onkey; 142 int irq; 143 int error; 144 145 onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey), 146 GFP_KERNEL); 147 if (!onkey) { 148 dev_err(&pdev->dev, "Failed to allocate memory.\n"); 149 return -ENOMEM; 150 } 151 152 onkey->dev = &pdev->dev; 153 onkey->hw = da9063; 154 155 if (pdata) 156 onkey->key_power = pdata->key_power; 157 else 158 onkey->key_power = 159 !of_property_read_bool(pdev->dev.of_node, 160 "dlg,disable-key-power"); 161 162 onkey->input = devm_input_allocate_device(&pdev->dev); 163 if (!onkey->input) { 164 dev_err(&pdev->dev, "Failed to allocated input device.\n"); 165 return -ENOMEM; 166 } 167 168 onkey->input->name = DA9063_DRVNAME_ONKEY; 169 onkey->input->phys = DA9063_DRVNAME_ONKEY "/input0"; 170 onkey->input->dev.parent = &pdev->dev; 171 172 if (onkey->key_power) 173 input_set_capability(onkey->input, EV_KEY, KEY_POWER); 174 175 input_set_capability(onkey->input, EV_KEY, KEY_SLEEP); 176 177 INIT_DELAYED_WORK(&onkey->work, da9063_poll_on); 178 179 error = devm_add_action(&pdev->dev, da9063_cancel_poll, onkey); 180 if (error) { 181 dev_err(&pdev->dev, 182 "Failed to add cancel poll action: %d\n", 183 error); 184 return error; 185 } 186 187 irq = platform_get_irq_byname(pdev, "ONKEY"); 188 if (irq < 0) { 189 error = irq; 190 dev_err(&pdev->dev, "Failed to get platform IRQ: %d\n", error); 191 return error; 192 } 193 194 error = devm_request_threaded_irq(&pdev->dev, irq, 195 NULL, da9063_onkey_irq_handler, 196 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 197 "ONKEY", onkey); 198 if (error) { 199 dev_err(&pdev->dev, 200 "Failed to request IRQ %d: %d\n", irq, error); 201 return error; 202 } 203 204 error = input_register_device(onkey->input); 205 if (error) { 206 dev_err(&pdev->dev, 207 "Failed to register input device: %d\n", error); 208 return error; 209 } 210 211 platform_set_drvdata(pdev, onkey); 212 return 0; 213 } 214 215 static struct platform_driver da9063_onkey_driver = { 216 .probe = da9063_onkey_probe, 217 .driver = { 218 .name = DA9063_DRVNAME_ONKEY, 219 }, 220 }; 221 module_platform_driver(da9063_onkey_driver); 222 223 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); 224 MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063"); 225 MODULE_LICENSE("GPL"); 226 MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY); 227