1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. 4 * Copyright (c) 2014, Sony Mobile Communications Inc. 5 */ 6 7 #include <linux/delay.h> 8 #include <linux/errno.h> 9 #include <linux/input.h> 10 #include <linux/interrupt.h> 11 #include <linux/kernel.h> 12 #include <linux/log2.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/of_device.h> 16 #include <linux/platform_device.h> 17 #include <linux/reboot.h> 18 #include <linux/regmap.h> 19 20 #define PON_REV2 0x01 21 22 #define PON_RT_STS 0x10 23 #define PON_KPDPWR_N_SET BIT(0) 24 #define PON_RESIN_N_SET BIT(1) 25 26 #define PON_PS_HOLD_RST_CTL 0x5a 27 #define PON_PS_HOLD_RST_CTL2 0x5b 28 #define PON_PS_HOLD_ENABLE BIT(7) 29 #define PON_PS_HOLD_TYPE_MASK 0x0f 30 #define PON_PS_HOLD_TYPE_SHUTDOWN 4 31 #define PON_PS_HOLD_TYPE_HARD_RESET 7 32 33 #define PON_PULL_CTL 0x70 34 #define PON_KPDPWR_PULL_UP BIT(1) 35 #define PON_RESIN_PULL_UP BIT(0) 36 37 #define PON_DBC_CTL 0x71 38 #define PON_DBC_DELAY_MASK 0x7 39 40 struct pm8941_data { 41 unsigned int pull_up_bit; 42 unsigned int status_bit; 43 }; 44 45 struct pm8941_pwrkey { 46 struct device *dev; 47 int irq; 48 u32 baseaddr; 49 struct regmap *regmap; 50 struct input_dev *input; 51 52 unsigned int revision; 53 struct notifier_block reboot_notifier; 54 55 u32 code; 56 const struct pm8941_data *data; 57 }; 58 59 static int pm8941_reboot_notify(struct notifier_block *nb, 60 unsigned long code, void *unused) 61 { 62 struct pm8941_pwrkey *pwrkey = container_of(nb, struct pm8941_pwrkey, 63 reboot_notifier); 64 unsigned int enable_reg; 65 unsigned int reset_type; 66 int error; 67 68 /* PMICs with revision 0 have the enable bit in same register as ctrl */ 69 if (pwrkey->revision == 0) 70 enable_reg = PON_PS_HOLD_RST_CTL; 71 else 72 enable_reg = PON_PS_HOLD_RST_CTL2; 73 74 error = regmap_update_bits(pwrkey->regmap, 75 pwrkey->baseaddr + enable_reg, 76 PON_PS_HOLD_ENABLE, 77 0); 78 if (error) 79 dev_err(pwrkey->dev, 80 "unable to clear ps hold reset enable: %d\n", 81 error); 82 83 /* 84 * Updates of PON_PS_HOLD_ENABLE requires 3 sleep cycles between 85 * writes. 86 */ 87 usleep_range(100, 1000); 88 89 switch (code) { 90 case SYS_HALT: 91 case SYS_POWER_OFF: 92 reset_type = PON_PS_HOLD_TYPE_SHUTDOWN; 93 break; 94 case SYS_RESTART: 95 default: 96 reset_type = PON_PS_HOLD_TYPE_HARD_RESET; 97 break; 98 } 99 100 error = regmap_update_bits(pwrkey->regmap, 101 pwrkey->baseaddr + PON_PS_HOLD_RST_CTL, 102 PON_PS_HOLD_TYPE_MASK, 103 reset_type); 104 if (error) 105 dev_err(pwrkey->dev, "unable to set ps hold reset type: %d\n", 106 error); 107 108 error = regmap_update_bits(pwrkey->regmap, 109 pwrkey->baseaddr + enable_reg, 110 PON_PS_HOLD_ENABLE, 111 PON_PS_HOLD_ENABLE); 112 if (error) 113 dev_err(pwrkey->dev, "unable to re-set enable: %d\n", error); 114 115 return NOTIFY_DONE; 116 } 117 118 static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data) 119 { 120 struct pm8941_pwrkey *pwrkey = _data; 121 unsigned int sts; 122 int error; 123 124 error = regmap_read(pwrkey->regmap, 125 pwrkey->baseaddr + PON_RT_STS, &sts); 126 if (error) 127 return IRQ_HANDLED; 128 129 input_report_key(pwrkey->input, pwrkey->code, 130 sts & pwrkey->data->status_bit); 131 input_sync(pwrkey->input); 132 133 return IRQ_HANDLED; 134 } 135 136 static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev) 137 { 138 struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev); 139 140 if (device_may_wakeup(dev)) 141 enable_irq_wake(pwrkey->irq); 142 143 return 0; 144 } 145 146 static int __maybe_unused pm8941_pwrkey_resume(struct device *dev) 147 { 148 struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev); 149 150 if (device_may_wakeup(dev)) 151 disable_irq_wake(pwrkey->irq); 152 153 return 0; 154 } 155 156 static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops, 157 pm8941_pwrkey_suspend, pm8941_pwrkey_resume); 158 159 static int pm8941_pwrkey_probe(struct platform_device *pdev) 160 { 161 struct pm8941_pwrkey *pwrkey; 162 bool pull_up; 163 struct device *parent; 164 u32 req_delay; 165 int error; 166 167 if (of_property_read_u32(pdev->dev.of_node, "debounce", &req_delay)) 168 req_delay = 15625; 169 170 if (req_delay > 2000000 || req_delay == 0) { 171 dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay); 172 return -EINVAL; 173 } 174 175 pull_up = of_property_read_bool(pdev->dev.of_node, "bias-pull-up"); 176 177 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL); 178 if (!pwrkey) 179 return -ENOMEM; 180 181 pwrkey->dev = &pdev->dev; 182 pwrkey->data = of_device_get_match_data(&pdev->dev); 183 184 parent = pdev->dev.parent; 185 pwrkey->regmap = dev_get_regmap(parent, NULL); 186 if (!pwrkey->regmap) { 187 /* 188 * We failed to get regmap for parent. Let's see if we are 189 * a child of pon node and read regmap and reg from its 190 * parent. 191 */ 192 pwrkey->regmap = dev_get_regmap(parent->parent, NULL); 193 if (!pwrkey->regmap) { 194 dev_err(&pdev->dev, "failed to locate regmap\n"); 195 return -ENODEV; 196 } 197 198 error = of_property_read_u32(parent->of_node, 199 "reg", &pwrkey->baseaddr); 200 } else { 201 error = of_property_read_u32(pdev->dev.of_node, "reg", 202 &pwrkey->baseaddr); 203 } 204 if (error) 205 return error; 206 207 pwrkey->irq = platform_get_irq(pdev, 0); 208 if (pwrkey->irq < 0) { 209 dev_err(&pdev->dev, "failed to get irq\n"); 210 return pwrkey->irq; 211 } 212 213 error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2, 214 &pwrkey->revision); 215 if (error) { 216 dev_err(&pdev->dev, "failed to set debounce: %d\n", error); 217 return error; 218 } 219 220 error = of_property_read_u32(pdev->dev.of_node, "linux,code", 221 &pwrkey->code); 222 if (error) { 223 dev_dbg(&pdev->dev, 224 "no linux,code assuming power (%d)\n", error); 225 pwrkey->code = KEY_POWER; 226 } 227 228 pwrkey->input = devm_input_allocate_device(&pdev->dev); 229 if (!pwrkey->input) { 230 dev_dbg(&pdev->dev, "unable to allocate input device\n"); 231 return -ENOMEM; 232 } 233 234 input_set_capability(pwrkey->input, EV_KEY, pwrkey->code); 235 236 pwrkey->input->name = "pm8941_pwrkey"; 237 pwrkey->input->phys = "pm8941_pwrkey/input0"; 238 239 req_delay = (req_delay << 6) / USEC_PER_SEC; 240 req_delay = ilog2(req_delay); 241 242 error = regmap_update_bits(pwrkey->regmap, 243 pwrkey->baseaddr + PON_DBC_CTL, 244 PON_DBC_DELAY_MASK, 245 req_delay); 246 if (error) { 247 dev_err(&pdev->dev, "failed to set debounce: %d\n", error); 248 return error; 249 } 250 251 error = regmap_update_bits(pwrkey->regmap, 252 pwrkey->baseaddr + PON_PULL_CTL, 253 pwrkey->data->pull_up_bit, 254 pull_up ? pwrkey->data->pull_up_bit : 0); 255 if (error) { 256 dev_err(&pdev->dev, "failed to set pull: %d\n", error); 257 return error; 258 } 259 260 error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq, 261 NULL, pm8941_pwrkey_irq, 262 IRQF_ONESHOT, 263 "pm8941_pwrkey", pwrkey); 264 if (error) { 265 dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error); 266 return error; 267 } 268 269 error = input_register_device(pwrkey->input); 270 if (error) { 271 dev_err(&pdev->dev, "failed to register input device: %d\n", 272 error); 273 return error; 274 } 275 276 pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify, 277 error = register_reboot_notifier(&pwrkey->reboot_notifier); 278 if (error) { 279 dev_err(&pdev->dev, "failed to register reboot notifier: %d\n", 280 error); 281 return error; 282 } 283 284 platform_set_drvdata(pdev, pwrkey); 285 device_init_wakeup(&pdev->dev, 1); 286 287 return 0; 288 } 289 290 static int pm8941_pwrkey_remove(struct platform_device *pdev) 291 { 292 struct pm8941_pwrkey *pwrkey = platform_get_drvdata(pdev); 293 294 unregister_reboot_notifier(&pwrkey->reboot_notifier); 295 296 return 0; 297 } 298 299 static const struct pm8941_data pwrkey_data = { 300 .pull_up_bit = PON_KPDPWR_PULL_UP, 301 .status_bit = PON_KPDPWR_N_SET, 302 }; 303 304 static const struct pm8941_data resin_data = { 305 .pull_up_bit = PON_RESIN_PULL_UP, 306 .status_bit = PON_RESIN_N_SET, 307 }; 308 309 static const struct of_device_id pm8941_pwr_key_id_table[] = { 310 { .compatible = "qcom,pm8941-pwrkey", .data = &pwrkey_data }, 311 { .compatible = "qcom,pm8941-resin", .data = &resin_data }, 312 { } 313 }; 314 MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table); 315 316 static struct platform_driver pm8941_pwrkey_driver = { 317 .probe = pm8941_pwrkey_probe, 318 .remove = pm8941_pwrkey_remove, 319 .driver = { 320 .name = "pm8941-pwrkey", 321 .pm = &pm8941_pwr_key_pm_ops, 322 .of_match_table = of_match_ptr(pm8941_pwr_key_id_table), 323 }, 324 }; 325 module_platform_driver(pm8941_pwrkey_driver); 326 327 MODULE_DESCRIPTION("PM8941 Power Key driver"); 328 MODULE_LICENSE("GPL v2"); 329