1 /* 2 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. 3 * Copyright (c) 2014, Sony Mobile Communications Inc. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 and 7 * only version 2 as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/errno.h> 17 #include <linux/input.h> 18 #include <linux/interrupt.h> 19 #include <linux/kernel.h> 20 #include <linux/log2.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_device.h> 24 #include <linux/platform_device.h> 25 #include <linux/reboot.h> 26 #include <linux/regmap.h> 27 28 #define PON_REV2 0x01 29 30 #define PON_RT_STS 0x10 31 #define PON_KPDPWR_N_SET BIT(0) 32 #define PON_RESIN_N_SET BIT(1) 33 34 #define PON_PS_HOLD_RST_CTL 0x5a 35 #define PON_PS_HOLD_RST_CTL2 0x5b 36 #define PON_PS_HOLD_ENABLE BIT(7) 37 #define PON_PS_HOLD_TYPE_MASK 0x0f 38 #define PON_PS_HOLD_TYPE_SHUTDOWN 4 39 #define PON_PS_HOLD_TYPE_HARD_RESET 7 40 41 #define PON_PULL_CTL 0x70 42 #define PON_KPDPWR_PULL_UP BIT(1) 43 #define PON_RESIN_PULL_UP BIT(0) 44 45 #define PON_DBC_CTL 0x71 46 #define PON_DBC_DELAY_MASK 0x7 47 48 struct pm8941_data { 49 unsigned int pull_up_bit; 50 unsigned int status_bit; 51 }; 52 53 struct pm8941_pwrkey { 54 struct device *dev; 55 int irq; 56 u32 baseaddr; 57 struct regmap *regmap; 58 struct input_dev *input; 59 60 unsigned int revision; 61 struct notifier_block reboot_notifier; 62 63 u32 code; 64 const struct pm8941_data *data; 65 }; 66 67 static int pm8941_reboot_notify(struct notifier_block *nb, 68 unsigned long code, void *unused) 69 { 70 struct pm8941_pwrkey *pwrkey = container_of(nb, struct pm8941_pwrkey, 71 reboot_notifier); 72 unsigned int enable_reg; 73 unsigned int reset_type; 74 int error; 75 76 /* PMICs with revision 0 have the enable bit in same register as ctrl */ 77 if (pwrkey->revision == 0) 78 enable_reg = PON_PS_HOLD_RST_CTL; 79 else 80 enable_reg = PON_PS_HOLD_RST_CTL2; 81 82 error = regmap_update_bits(pwrkey->regmap, 83 pwrkey->baseaddr + enable_reg, 84 PON_PS_HOLD_ENABLE, 85 0); 86 if (error) 87 dev_err(pwrkey->dev, 88 "unable to clear ps hold reset enable: %d\n", 89 error); 90 91 /* 92 * Updates of PON_PS_HOLD_ENABLE requires 3 sleep cycles between 93 * writes. 94 */ 95 usleep_range(100, 1000); 96 97 switch (code) { 98 case SYS_HALT: 99 case SYS_POWER_OFF: 100 reset_type = PON_PS_HOLD_TYPE_SHUTDOWN; 101 break; 102 case SYS_RESTART: 103 default: 104 reset_type = PON_PS_HOLD_TYPE_HARD_RESET; 105 break; 106 } 107 108 error = regmap_update_bits(pwrkey->regmap, 109 pwrkey->baseaddr + PON_PS_HOLD_RST_CTL, 110 PON_PS_HOLD_TYPE_MASK, 111 reset_type); 112 if (error) 113 dev_err(pwrkey->dev, "unable to set ps hold reset type: %d\n", 114 error); 115 116 error = regmap_update_bits(pwrkey->regmap, 117 pwrkey->baseaddr + enable_reg, 118 PON_PS_HOLD_ENABLE, 119 PON_PS_HOLD_ENABLE); 120 if (error) 121 dev_err(pwrkey->dev, "unable to re-set enable: %d\n", error); 122 123 return NOTIFY_DONE; 124 } 125 126 static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data) 127 { 128 struct pm8941_pwrkey *pwrkey = _data; 129 unsigned int sts; 130 int error; 131 132 error = regmap_read(pwrkey->regmap, 133 pwrkey->baseaddr + PON_RT_STS, &sts); 134 if (error) 135 return IRQ_HANDLED; 136 137 input_report_key(pwrkey->input, pwrkey->code, 138 sts & pwrkey->data->status_bit); 139 input_sync(pwrkey->input); 140 141 return IRQ_HANDLED; 142 } 143 144 static int __maybe_unused pm8941_pwrkey_suspend(struct device *dev) 145 { 146 struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev); 147 148 if (device_may_wakeup(dev)) 149 enable_irq_wake(pwrkey->irq); 150 151 return 0; 152 } 153 154 static int __maybe_unused pm8941_pwrkey_resume(struct device *dev) 155 { 156 struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev); 157 158 if (device_may_wakeup(dev)) 159 disable_irq_wake(pwrkey->irq); 160 161 return 0; 162 } 163 164 static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops, 165 pm8941_pwrkey_suspend, pm8941_pwrkey_resume); 166 167 static int pm8941_pwrkey_probe(struct platform_device *pdev) 168 { 169 struct pm8941_pwrkey *pwrkey; 170 bool pull_up; 171 struct device *parent; 172 u32 req_delay; 173 int error; 174 175 if (of_property_read_u32(pdev->dev.of_node, "debounce", &req_delay)) 176 req_delay = 15625; 177 178 if (req_delay > 2000000 || req_delay == 0) { 179 dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay); 180 return -EINVAL; 181 } 182 183 pull_up = of_property_read_bool(pdev->dev.of_node, "bias-pull-up"); 184 185 pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL); 186 if (!pwrkey) 187 return -ENOMEM; 188 189 pwrkey->dev = &pdev->dev; 190 pwrkey->data = of_device_get_match_data(&pdev->dev); 191 192 parent = pdev->dev.parent; 193 pwrkey->regmap = dev_get_regmap(parent, NULL); 194 if (!pwrkey->regmap) { 195 /* 196 * We failed to get regmap for parent. Let's see if we are 197 * a child of pon node and read regmap and reg from its 198 * parent. 199 */ 200 pwrkey->regmap = dev_get_regmap(parent->parent, NULL); 201 if (!pwrkey->regmap) { 202 dev_err(&pdev->dev, "failed to locate regmap\n"); 203 return -ENODEV; 204 } 205 206 error = of_property_read_u32(parent->of_node, 207 "reg", &pwrkey->baseaddr); 208 } else { 209 error = of_property_read_u32(pdev->dev.of_node, "reg", 210 &pwrkey->baseaddr); 211 } 212 if (error) 213 return error; 214 215 pwrkey->irq = platform_get_irq(pdev, 0); 216 if (pwrkey->irq < 0) { 217 dev_err(&pdev->dev, "failed to get irq\n"); 218 return pwrkey->irq; 219 } 220 221 error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2, 222 &pwrkey->revision); 223 if (error) { 224 dev_err(&pdev->dev, "failed to set debounce: %d\n", error); 225 return error; 226 } 227 228 error = of_property_read_u32(pdev->dev.of_node, "linux,code", 229 &pwrkey->code); 230 if (error) { 231 dev_dbg(&pdev->dev, 232 "no linux,code assuming power (%d)\n", error); 233 pwrkey->code = KEY_POWER; 234 } 235 236 pwrkey->input = devm_input_allocate_device(&pdev->dev); 237 if (!pwrkey->input) { 238 dev_dbg(&pdev->dev, "unable to allocate input device\n"); 239 return -ENOMEM; 240 } 241 242 input_set_capability(pwrkey->input, EV_KEY, pwrkey->code); 243 244 pwrkey->input->name = "pm8941_pwrkey"; 245 pwrkey->input->phys = "pm8941_pwrkey/input0"; 246 247 req_delay = (req_delay << 6) / USEC_PER_SEC; 248 req_delay = ilog2(req_delay); 249 250 error = regmap_update_bits(pwrkey->regmap, 251 pwrkey->baseaddr + PON_DBC_CTL, 252 PON_DBC_DELAY_MASK, 253 req_delay); 254 if (error) { 255 dev_err(&pdev->dev, "failed to set debounce: %d\n", error); 256 return error; 257 } 258 259 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 : 0); 263 if (error) { 264 dev_err(&pdev->dev, "failed to set pull: %d\n", error); 265 return error; 266 } 267 268 error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq, 269 NULL, pm8941_pwrkey_irq, 270 IRQF_ONESHOT, 271 "pm8941_pwrkey", pwrkey); 272 if (error) { 273 dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error); 274 return error; 275 } 276 277 error = input_register_device(pwrkey->input); 278 if (error) { 279 dev_err(&pdev->dev, "failed to register input device: %d\n", 280 error); 281 return error; 282 } 283 284 pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify, 285 error = register_reboot_notifier(&pwrkey->reboot_notifier); 286 if (error) { 287 dev_err(&pdev->dev, "failed to register reboot notifier: %d\n", 288 error); 289 return error; 290 } 291 292 platform_set_drvdata(pdev, pwrkey); 293 device_init_wakeup(&pdev->dev, 1); 294 295 return 0; 296 } 297 298 static int pm8941_pwrkey_remove(struct platform_device *pdev) 299 { 300 struct pm8941_pwrkey *pwrkey = platform_get_drvdata(pdev); 301 302 unregister_reboot_notifier(&pwrkey->reboot_notifier); 303 304 return 0; 305 } 306 307 static const struct pm8941_data pwrkey_data = { 308 .pull_up_bit = PON_KPDPWR_PULL_UP, 309 .status_bit = PON_KPDPWR_N_SET, 310 }; 311 312 static const struct pm8941_data resin_data = { 313 .pull_up_bit = PON_RESIN_PULL_UP, 314 .status_bit = PON_RESIN_N_SET, 315 }; 316 317 static const struct of_device_id pm8941_pwr_key_id_table[] = { 318 { .compatible = "qcom,pm8941-pwrkey", .data = &pwrkey_data }, 319 { .compatible = "qcom,pm8941-resin", .data = &resin_data }, 320 { } 321 }; 322 MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table); 323 324 static struct platform_driver pm8941_pwrkey_driver = { 325 .probe = pm8941_pwrkey_probe, 326 .remove = pm8941_pwrkey_remove, 327 .driver = { 328 .name = "pm8941-pwrkey", 329 .pm = &pm8941_pwr_key_pm_ops, 330 .of_match_table = of_match_ptr(pm8941_pwr_key_id_table), 331 }, 332 }; 333 module_platform_driver(pm8941_pwrkey_driver); 334 335 MODULE_DESCRIPTION("PM8941 Power Key driver"); 336 MODULE_LICENSE("GPL v2"); 337