1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2017 MediaTek, Inc. 4 * 5 * Author: Chen Zhong <chen.zhong@mediatek.com> 6 */ 7 8 #include <linux/input.h> 9 #include <linux/interrupt.h> 10 #include <linux/kernel.h> 11 #include <linux/mfd/mt6323/registers.h> 12 #include <linux/mfd/mt6331/registers.h> 13 #include <linux/mfd/mt6358/registers.h> 14 #include <linux/mfd/mt6397/core.h> 15 #include <linux/mfd/mt6397/registers.h> 16 #include <linux/module.h> 17 #include <linux/of_device.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <linux/regmap.h> 21 22 #define MTK_PMIC_RST_DU_MASK GENMASK(9, 8) 23 #define MTK_PMIC_PWRKEY_RST BIT(6) 24 #define MTK_PMIC_HOMEKEY_RST BIT(5) 25 26 #define MTK_PMIC_MT6331_RST_DU_MASK GENMASK(13, 12) 27 #define MTK_PMIC_MT6331_PWRKEY_RST BIT(9) 28 #define MTK_PMIC_MT6331_HOMEKEY_RST BIT(8) 29 30 #define MTK_PMIC_PWRKEY_INDEX 0 31 #define MTK_PMIC_HOMEKEY_INDEX 1 32 #define MTK_PMIC_MAX_KEY_COUNT 2 33 34 struct mtk_pmic_keys_regs { 35 u32 deb_reg; 36 u32 deb_mask; 37 u32 intsel_reg; 38 u32 intsel_mask; 39 u32 rst_en_mask; 40 }; 41 42 #define MTK_PMIC_KEYS_REGS(_deb_reg, _deb_mask, \ 43 _intsel_reg, _intsel_mask, _rst_mask) \ 44 { \ 45 .deb_reg = _deb_reg, \ 46 .deb_mask = _deb_mask, \ 47 .intsel_reg = _intsel_reg, \ 48 .intsel_mask = _intsel_mask, \ 49 .rst_en_mask = _rst_mask, \ 50 } 51 52 struct mtk_pmic_regs { 53 const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT]; 54 u32 pmic_rst_reg; 55 u32 rst_lprst_mask; /* Long-press reset timeout bitmask */ 56 }; 57 58 static const struct mtk_pmic_regs mt6397_regs = { 59 .keys_regs[MTK_PMIC_PWRKEY_INDEX] = 60 MTK_PMIC_KEYS_REGS(MT6397_CHRSTATUS, 61 0x8, MT6397_INT_RSV, 0x10, MTK_PMIC_PWRKEY_RST), 62 .keys_regs[MTK_PMIC_HOMEKEY_INDEX] = 63 MTK_PMIC_KEYS_REGS(MT6397_OCSTATUS2, 64 0x10, MT6397_INT_RSV, 0x8, MTK_PMIC_HOMEKEY_RST), 65 .pmic_rst_reg = MT6397_TOP_RST_MISC, 66 .rst_lprst_mask = MTK_PMIC_RST_DU_MASK, 67 }; 68 69 static const struct mtk_pmic_regs mt6323_regs = { 70 .keys_regs[MTK_PMIC_PWRKEY_INDEX] = 71 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS, 72 0x2, MT6323_INT_MISC_CON, 0x10, MTK_PMIC_PWRKEY_RST), 73 .keys_regs[MTK_PMIC_HOMEKEY_INDEX] = 74 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS, 75 0x4, MT6323_INT_MISC_CON, 0x8, MTK_PMIC_HOMEKEY_RST), 76 .pmic_rst_reg = MT6323_TOP_RST_MISC, 77 .rst_lprst_mask = MTK_PMIC_RST_DU_MASK, 78 }; 79 80 static const struct mtk_pmic_regs mt6331_regs = { 81 .keys_regs[MTK_PMIC_PWRKEY_INDEX] = 82 MTK_PMIC_KEYS_REGS(MT6331_TOPSTATUS, 0x2, 83 MT6331_INT_MISC_CON, 0x4, 84 MTK_PMIC_MT6331_PWRKEY_RST), 85 .keys_regs[MTK_PMIC_HOMEKEY_INDEX] = 86 MTK_PMIC_KEYS_REGS(MT6331_TOPSTATUS, 0x4, 87 MT6331_INT_MISC_CON, 0x2, 88 MTK_PMIC_MT6331_HOMEKEY_RST), 89 .pmic_rst_reg = MT6331_TOP_RST_MISC, 90 .rst_lprst_mask = MTK_PMIC_MT6331_RST_DU_MASK, 91 }; 92 93 static const struct mtk_pmic_regs mt6358_regs = { 94 .keys_regs[MTK_PMIC_PWRKEY_INDEX] = 95 MTK_PMIC_KEYS_REGS(MT6358_TOPSTATUS, 96 0x2, MT6358_PSC_TOP_INT_CON0, 0x5, 97 MTK_PMIC_PWRKEY_RST), 98 .keys_regs[MTK_PMIC_HOMEKEY_INDEX] = 99 MTK_PMIC_KEYS_REGS(MT6358_TOPSTATUS, 100 0x8, MT6358_PSC_TOP_INT_CON0, 0xa, 101 MTK_PMIC_HOMEKEY_RST), 102 .pmic_rst_reg = MT6358_TOP_RST_MISC, 103 .rst_lprst_mask = MTK_PMIC_RST_DU_MASK, 104 }; 105 106 struct mtk_pmic_keys_info { 107 struct mtk_pmic_keys *keys; 108 const struct mtk_pmic_keys_regs *regs; 109 unsigned int keycode; 110 int irq; 111 int irq_r; /* optional: release irq if different */ 112 bool wakeup:1; 113 }; 114 115 struct mtk_pmic_keys { 116 struct input_dev *input_dev; 117 struct device *dev; 118 struct regmap *regmap; 119 struct mtk_pmic_keys_info keys[MTK_PMIC_MAX_KEY_COUNT]; 120 }; 121 122 enum mtk_pmic_keys_lp_mode { 123 LP_DISABLE, 124 LP_ONEKEY, 125 LP_TWOKEY, 126 }; 127 128 static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys, 129 const struct mtk_pmic_regs *regs) 130 { 131 const struct mtk_pmic_keys_regs *kregs_home, *kregs_pwr; 132 u32 long_press_mode, long_press_debounce; 133 u32 value, mask; 134 int error; 135 136 kregs_home = keys->keys[MTK_PMIC_HOMEKEY_INDEX].regs; 137 kregs_pwr = keys->keys[MTK_PMIC_PWRKEY_INDEX].regs; 138 139 error = of_property_read_u32(keys->dev->of_node, "power-off-time-sec", 140 &long_press_debounce); 141 if (error) 142 long_press_debounce = 0; 143 144 mask = regs->rst_lprst_mask; 145 value = long_press_debounce << (ffs(regs->rst_lprst_mask) - 1); 146 147 error = of_property_read_u32(keys->dev->of_node, 148 "mediatek,long-press-mode", 149 &long_press_mode); 150 if (error) 151 long_press_mode = LP_DISABLE; 152 153 switch (long_press_mode) { 154 case LP_TWOKEY: 155 value |= kregs_home->rst_en_mask; 156 fallthrough; 157 158 case LP_ONEKEY: 159 value |= kregs_pwr->rst_en_mask; 160 fallthrough; 161 162 case LP_DISABLE: 163 mask |= kregs_home->rst_en_mask; 164 mask |= kregs_pwr->rst_en_mask; 165 break; 166 167 default: 168 break; 169 } 170 171 regmap_update_bits(keys->regmap, regs->pmic_rst_reg, mask, value); 172 } 173 174 static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data) 175 { 176 struct mtk_pmic_keys_info *info = data; 177 u32 key_deb, pressed; 178 179 regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb); 180 181 key_deb &= info->regs->deb_mask; 182 183 pressed = !key_deb; 184 185 input_report_key(info->keys->input_dev, info->keycode, pressed); 186 input_sync(info->keys->input_dev); 187 188 dev_dbg(info->keys->dev, "(%s) key =%d using PMIC\n", 189 pressed ? "pressed" : "released", info->keycode); 190 191 return IRQ_HANDLED; 192 } 193 194 static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys, 195 struct mtk_pmic_keys_info *info) 196 { 197 int ret; 198 199 info->keys = keys; 200 201 ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg, 202 info->regs->intsel_mask, 203 info->regs->intsel_mask); 204 if (ret < 0) 205 return ret; 206 207 ret = devm_request_threaded_irq(keys->dev, info->irq, NULL, 208 mtk_pmic_keys_irq_handler_thread, 209 IRQF_ONESHOT | IRQF_TRIGGER_HIGH, 210 "mtk-pmic-keys", info); 211 if (ret) { 212 dev_err(keys->dev, "Failed to request IRQ: %d: %d\n", 213 info->irq, ret); 214 return ret; 215 } 216 217 if (info->irq_r > 0) { 218 ret = devm_request_threaded_irq(keys->dev, info->irq_r, NULL, 219 mtk_pmic_keys_irq_handler_thread, 220 IRQF_ONESHOT | IRQF_TRIGGER_HIGH, 221 "mtk-pmic-keys", info); 222 if (ret) { 223 dev_err(keys->dev, "Failed to request IRQ_r: %d: %d\n", 224 info->irq, ret); 225 return ret; 226 } 227 } 228 229 input_set_capability(keys->input_dev, EV_KEY, info->keycode); 230 231 return 0; 232 } 233 234 static int __maybe_unused mtk_pmic_keys_suspend(struct device *dev) 235 { 236 struct mtk_pmic_keys *keys = dev_get_drvdata(dev); 237 int index; 238 239 for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) { 240 if (keys->keys[index].wakeup) { 241 enable_irq_wake(keys->keys[index].irq); 242 if (keys->keys[index].irq_r > 0) 243 enable_irq_wake(keys->keys[index].irq_r); 244 } 245 } 246 247 return 0; 248 } 249 250 static int __maybe_unused mtk_pmic_keys_resume(struct device *dev) 251 { 252 struct mtk_pmic_keys *keys = dev_get_drvdata(dev); 253 int index; 254 255 for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) { 256 if (keys->keys[index].wakeup) { 257 disable_irq_wake(keys->keys[index].irq); 258 if (keys->keys[index].irq_r > 0) 259 disable_irq_wake(keys->keys[index].irq_r); 260 } 261 } 262 263 return 0; 264 } 265 266 static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend, 267 mtk_pmic_keys_resume); 268 269 static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = { 270 { 271 .compatible = "mediatek,mt6397-keys", 272 .data = &mt6397_regs, 273 }, { 274 .compatible = "mediatek,mt6323-keys", 275 .data = &mt6323_regs, 276 }, { 277 .compatible = "mediatek,mt6331-keys", 278 .data = &mt6331_regs, 279 }, { 280 .compatible = "mediatek,mt6358-keys", 281 .data = &mt6358_regs, 282 }, { 283 /* sentinel */ 284 } 285 }; 286 MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl); 287 288 static int mtk_pmic_keys_probe(struct platform_device *pdev) 289 { 290 int error, index = 0; 291 unsigned int keycount; 292 struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent); 293 struct device_node *node = pdev->dev.of_node, *child; 294 static const char *const irqnames[] = { "powerkey", "homekey" }; 295 static const char *const irqnames_r[] = { "powerkey_r", "homekey_r" }; 296 struct mtk_pmic_keys *keys; 297 const struct mtk_pmic_regs *mtk_pmic_regs; 298 struct input_dev *input_dev; 299 const struct of_device_id *of_id = 300 of_match_device(of_mtk_pmic_keys_match_tbl, &pdev->dev); 301 302 keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL); 303 if (!keys) 304 return -ENOMEM; 305 306 keys->dev = &pdev->dev; 307 keys->regmap = pmic_chip->regmap; 308 mtk_pmic_regs = of_id->data; 309 310 keys->input_dev = input_dev = devm_input_allocate_device(keys->dev); 311 if (!input_dev) { 312 dev_err(keys->dev, "input allocate device fail.\n"); 313 return -ENOMEM; 314 } 315 316 input_dev->name = "mtk-pmic-keys"; 317 input_dev->id.bustype = BUS_HOST; 318 input_dev->id.vendor = 0x0001; 319 input_dev->id.product = 0x0001; 320 input_dev->id.version = 0x0001; 321 322 keycount = of_get_available_child_count(node); 323 if (keycount > MTK_PMIC_MAX_KEY_COUNT || 324 keycount > ARRAY_SIZE(irqnames)) { 325 dev_err(keys->dev, "too many keys defined (%d)\n", keycount); 326 return -EINVAL; 327 } 328 329 for_each_child_of_node(node, child) { 330 keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index]; 331 332 keys->keys[index].irq = 333 platform_get_irq_byname(pdev, irqnames[index]); 334 if (keys->keys[index].irq < 0) { 335 of_node_put(child); 336 return keys->keys[index].irq; 337 } 338 339 if (of_device_is_compatible(node, "mediatek,mt6358-keys")) { 340 keys->keys[index].irq_r = platform_get_irq_byname(pdev, 341 irqnames_r[index]); 342 343 if (keys->keys[index].irq_r < 0) { 344 of_node_put(child); 345 return keys->keys[index].irq_r; 346 } 347 } 348 349 error = of_property_read_u32(child, 350 "linux,keycodes", &keys->keys[index].keycode); 351 if (error) { 352 dev_err(keys->dev, 353 "failed to read key:%d linux,keycode property: %d\n", 354 index, error); 355 of_node_put(child); 356 return error; 357 } 358 359 if (of_property_read_bool(child, "wakeup-source")) 360 keys->keys[index].wakeup = true; 361 362 error = mtk_pmic_key_setup(keys, &keys->keys[index]); 363 if (error) { 364 of_node_put(child); 365 return error; 366 } 367 368 index++; 369 } 370 371 error = input_register_device(input_dev); 372 if (error) { 373 dev_err(&pdev->dev, 374 "register input device failed (%d)\n", error); 375 return error; 376 } 377 378 mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs); 379 380 platform_set_drvdata(pdev, keys); 381 382 return 0; 383 } 384 385 static struct platform_driver pmic_keys_pdrv = { 386 .probe = mtk_pmic_keys_probe, 387 .driver = { 388 .name = "mtk-pmic-keys", 389 .of_match_table = of_mtk_pmic_keys_match_tbl, 390 .pm = &mtk_pmic_keys_pm_ops, 391 }, 392 }; 393 394 module_platform_driver(pmic_keys_pdrv); 395 396 MODULE_LICENSE("GPL v2"); 397 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>"); 398 MODULE_DESCRIPTION("MTK pmic-keys driver v0.1"); 399