1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2010-2011, 2020-2021, The Linux Foundation. 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 #define PON_GEN3_RESIN_N_SET BIT(6) 26 #define PON_GEN3_KPDPWR_N_SET BIT(7) 27 28 #define PON_PS_HOLD_RST_CTL 0x5a 29 #define PON_PS_HOLD_RST_CTL2 0x5b 30 #define PON_PS_HOLD_ENABLE BIT(7) 31 #define PON_PS_HOLD_TYPE_MASK 0x0f 32 #define PON_PS_HOLD_TYPE_SHUTDOWN 4 33 #define PON_PS_HOLD_TYPE_HARD_RESET 7 34 35 #define PON_PULL_CTL 0x70 36 #define PON_KPDPWR_PULL_UP BIT(1) 37 #define PON_RESIN_PULL_UP BIT(0) 38 39 #define PON_DBC_CTL 0x71 40 #define PON_DBC_DELAY_MASK 0x7 41 42 struct pm8941_data { 43 unsigned int pull_up_bit; 44 unsigned int status_bit; 45 bool supports_ps_hold_poff_config; 46 bool supports_debounce_config; 47 const char *name; 48 const char *phys; 49 }; 50 51 struct pm8941_pwrkey { 52 struct device *dev; 53 int irq; 54 u32 baseaddr; 55 struct regmap *regmap; 56 struct input_dev *input; 57 58 unsigned int revision; 59 struct notifier_block reboot_notifier; 60 61 u32 code; 62 const struct pm8941_data *data; 63 }; 64 65 static int pm8941_reboot_notify(struct notifier_block *nb, 66 unsigned long code, void *unused) 67 { 68 struct pm8941_pwrkey *pwrkey = container_of(nb, struct pm8941_pwrkey, 69 reboot_notifier); 70 unsigned int enable_reg; 71 unsigned int reset_type; 72 int error; 73 74 /* PMICs with revision 0 have the enable bit in same register as ctrl */ 75 if (pwrkey->revision == 0) 76 enable_reg = PON_PS_HOLD_RST_CTL; 77 else 78 enable_reg = PON_PS_HOLD_RST_CTL2; 79 80 error = regmap_update_bits(pwrkey->regmap, 81 pwrkey->baseaddr + enable_reg, 82 PON_PS_HOLD_ENABLE, 83 0); 84 if (error) 85 dev_err(pwrkey->dev, 86 "unable to clear ps hold reset enable: %d\n", 87 error); 88 89 /* 90 * Updates of PON_PS_HOLD_ENABLE requires 3 sleep cycles between 91 * writes. 92 */ 93 usleep_range(100, 1000); 94 95 switch (code) { 96 case SYS_HALT: 97 case SYS_POWER_OFF: 98 reset_type = PON_PS_HOLD_TYPE_SHUTDOWN; 99 break; 100 case SYS_RESTART: 101 default: 102 reset_type = PON_PS_HOLD_TYPE_HARD_RESET; 103 break; 104 } 105 106 error = regmap_update_bits(pwrkey->regmap, 107 pwrkey->baseaddr + PON_PS_HOLD_RST_CTL, 108 PON_PS_HOLD_TYPE_MASK, 109 reset_type); 110 if (error) 111 dev_err(pwrkey->dev, "unable to set ps hold reset type: %d\n", 112 error); 113 114 error = regmap_update_bits(pwrkey->regmap, 115 pwrkey->baseaddr + enable_reg, 116 PON_PS_HOLD_ENABLE, 117 PON_PS_HOLD_ENABLE); 118 if (error) 119 dev_err(pwrkey->dev, "unable to re-set enable: %d\n", error); 120 121 return NOTIFY_DONE; 122 } 123 124 static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data) 125 { 126 struct pm8941_pwrkey *pwrkey = _data; 127 unsigned int sts; 128 int error; 129 130 error = regmap_read(pwrkey->regmap, 131 pwrkey->baseaddr + PON_RT_STS, &sts); 132 if (error) 133 return IRQ_HANDLED; 134 135 input_report_key(pwrkey->input, pwrkey->code, 136 sts & pwrkey->data->status_bit); 137 input_sync(pwrkey->input); 138 139 return IRQ_HANDLED; 140 } 141 142 static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev) 143 { 144 struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev); 145 146 if (device_may_wakeup(dev)) 147 enable_irq_wake(pwrkey->irq); 148 149 return 0; 150 } 151 152 static int __maybe_unused pm8941_pwrkey_resume(struct device *dev) 153 { 154 struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev); 155 156 if (device_may_wakeup(dev)) 157 disable_irq_wake(pwrkey->irq); 158 159 return 0; 160 } 161 162 static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops, 163 pm8941_pwrkey_suspend, pm8941_pwrkey_resume); 164 165 static int pm8941_pwrkey_probe(struct platform_device *pdev) 166 { 167 struct pm8941_pwrkey *pwrkey; 168 bool pull_up; 169 struct device *parent; 170 u32 req_delay; 171 int error; 172 173 if (of_property_read_u32(pdev->dev.of_node, "debounce", &req_delay)) 174 req_delay = 15625; 175 176 if (req_delay > 2000000 || req_delay == 0) { 177 dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay); 178 return -EINVAL; 179 } 180 181 pull_up = of_property_read_bool(pdev->dev.of_node, "bias-pull-up"); 182 183 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL); 184 if (!pwrkey) 185 return -ENOMEM; 186 187 pwrkey->dev = &pdev->dev; 188 pwrkey->data = of_device_get_match_data(&pdev->dev); 189 190 parent = pdev->dev.parent; 191 pwrkey->regmap = dev_get_regmap(parent, NULL); 192 if (!pwrkey->regmap) { 193 /* 194 * We failed to get regmap for parent. Let's see if we are 195 * a child of pon node and read regmap and reg from its 196 * parent. 197 */ 198 pwrkey->regmap = dev_get_regmap(parent->parent, NULL); 199 if (!pwrkey->regmap) { 200 dev_err(&pdev->dev, "failed to locate regmap\n"); 201 return -ENODEV; 202 } 203 204 error = of_property_read_u32(parent->of_node, 205 "reg", &pwrkey->baseaddr); 206 } else { 207 error = of_property_read_u32(pdev->dev.of_node, "reg", 208 &pwrkey->baseaddr); 209 } 210 if (error) 211 return error; 212 213 pwrkey->irq = platform_get_irq(pdev, 0); 214 if (pwrkey->irq < 0) 215 return pwrkey->irq; 216 217 error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2, 218 &pwrkey->revision); 219 if (error) { 220 dev_err(&pdev->dev, "failed to set debounce: %d\n", error); 221 return error; 222 } 223 224 error = of_property_read_u32(pdev->dev.of_node, "linux,code", 225 &pwrkey->code); 226 if (error) { 227 dev_dbg(&pdev->dev, 228 "no linux,code assuming power (%d)\n", error); 229 pwrkey->code = KEY_POWER; 230 } 231 232 pwrkey->input = devm_input_allocate_device(&pdev->dev); 233 if (!pwrkey->input) { 234 dev_dbg(&pdev->dev, "unable to allocate input device\n"); 235 return -ENOMEM; 236 } 237 238 input_set_capability(pwrkey->input, EV_KEY, pwrkey->code); 239 240 pwrkey->input->name = pwrkey->data->name; 241 pwrkey->input->phys = pwrkey->data->phys; 242 243 if (pwrkey->data->supports_debounce_config) { 244 req_delay = (req_delay << 6) / USEC_PER_SEC; 245 req_delay = ilog2(req_delay); 246 247 error = regmap_update_bits(pwrkey->regmap, 248 pwrkey->baseaddr + PON_DBC_CTL, 249 PON_DBC_DELAY_MASK, 250 req_delay); 251 if (error) { 252 dev_err(&pdev->dev, "failed to set debounce: %d\n", 253 error); 254 return error; 255 } 256 } 257 258 if (pwrkey->data->pull_up_bit) { 259 error = regmap_update_bits(pwrkey->regmap, 260 pwrkey->baseaddr + PON_PULL_CTL, 261 pwrkey->data->pull_up_bit, 262 pull_up ? pwrkey->data->pull_up_bit : 263 0); 264 if (error) { 265 dev_err(&pdev->dev, "failed to set pull: %d\n", error); 266 return error; 267 } 268 } 269 270 error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq, 271 NULL, pm8941_pwrkey_irq, 272 IRQF_ONESHOT, 273 pwrkey->data->name, pwrkey); 274 if (error) { 275 dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error); 276 return error; 277 } 278 279 error = input_register_device(pwrkey->input); 280 if (error) { 281 dev_err(&pdev->dev, "failed to register input device: %d\n", 282 error); 283 return error; 284 } 285 286 if (pwrkey->data->supports_ps_hold_poff_config) { 287 pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify; 288 error = register_reboot_notifier(&pwrkey->reboot_notifier); 289 if (error) { 290 dev_err(&pdev->dev, "failed to register reboot notifier: %d\n", 291 error); 292 return error; 293 } 294 } 295 296 platform_set_drvdata(pdev, pwrkey); 297 device_init_wakeup(&pdev->dev, 1); 298 299 return 0; 300 } 301 302 static int pm8941_pwrkey_remove(struct platform_device *pdev) 303 { 304 struct pm8941_pwrkey *pwrkey = platform_get_drvdata(pdev); 305 306 if (pwrkey->data->supports_ps_hold_poff_config) 307 unregister_reboot_notifier(&pwrkey->reboot_notifier); 308 309 return 0; 310 } 311 312 static const struct pm8941_data pwrkey_data = { 313 .pull_up_bit = PON_KPDPWR_PULL_UP, 314 .status_bit = PON_KPDPWR_N_SET, 315 .name = "pm8941_pwrkey", 316 .phys = "pm8941_pwrkey/input0", 317 .supports_ps_hold_poff_config = true, 318 .supports_debounce_config = true, 319 }; 320 321 static const struct pm8941_data resin_data = { 322 .pull_up_bit = PON_RESIN_PULL_UP, 323 .status_bit = PON_RESIN_N_SET, 324 .name = "pm8941_resin", 325 .phys = "pm8941_resin/input0", 326 .supports_ps_hold_poff_config = true, 327 .supports_debounce_config = true, 328 }; 329 330 static const struct pm8941_data pon_gen3_pwrkey_data = { 331 .status_bit = PON_GEN3_KPDPWR_N_SET, 332 .name = "pmic_pwrkey", 333 .phys = "pmic_pwrkey/input0", 334 .supports_ps_hold_poff_config = false, 335 .supports_debounce_config = false, 336 }; 337 338 static const struct pm8941_data pon_gen3_resin_data = { 339 .status_bit = PON_GEN3_RESIN_N_SET, 340 .name = "pmic_resin", 341 .phys = "pmic_resin/input0", 342 .supports_ps_hold_poff_config = false, 343 .supports_debounce_config = false, 344 }; 345 346 static const struct of_device_id pm8941_pwr_key_id_table[] = { 347 { .compatible = "qcom,pm8941-pwrkey", .data = &pwrkey_data }, 348 { .compatible = "qcom,pm8941-resin", .data = &resin_data }, 349 { .compatible = "qcom,pmk8350-pwrkey", .data = &pon_gen3_pwrkey_data }, 350 { .compatible = "qcom,pmk8350-resin", .data = &pon_gen3_resin_data }, 351 { } 352 }; 353 MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table); 354 355 static struct platform_driver pm8941_pwrkey_driver = { 356 .probe = pm8941_pwrkey_probe, 357 .remove = pm8941_pwrkey_remove, 358 .driver = { 359 .name = "pm8941-pwrkey", 360 .pm = &pm8941_pwr_key_pm_ops, 361 .of_match_table = of_match_ptr(pm8941_pwr_key_id_table), 362 }, 363 }; 364 module_platform_driver(pm8941_pwrkey_driver); 365 366 MODULE_DESCRIPTION("PM8941 Power Key driver"); 367 MODULE_LICENSE("GPL v2"); 368