1 /* 2 * Copyright (C) 2017 MediaTek, Inc. 3 * 4 * Author: Chen Zhong <chen.zhong@mediatek.com> 5 * 6 * This software is licensed under the terms of the GNU General Public 7 * License version 2, as published by the Free Software Foundation, and 8 * may be copied, distributed, and modified under those terms. 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 17 #include <linux/input.h> 18 #include <linux/interrupt.h> 19 #include <linux/kernel.h> 20 #include <linux/mfd/mt6323/registers.h> 21 #include <linux/mfd/mt6397/core.h> 22 #include <linux/mfd/mt6397/registers.h> 23 #include <linux/module.h> 24 #include <linux/of_device.h> 25 #include <linux/of.h> 26 #include <linux/platform_device.h> 27 #include <linux/regmap.h> 28 29 #define MTK_PMIC_PWRKEY_RST_EN_MASK 0x1 30 #define MTK_PMIC_PWRKEY_RST_EN_SHIFT 6 31 #define MTK_PMIC_HOMEKEY_RST_EN_MASK 0x1 32 #define MTK_PMIC_HOMEKEY_RST_EN_SHIFT 5 33 #define MTK_PMIC_RST_DU_MASK 0x3 34 #define MTK_PMIC_RST_DU_SHIFT 8 35 36 #define MTK_PMIC_PWRKEY_RST \ 37 (MTK_PMIC_PWRKEY_RST_EN_MASK << MTK_PMIC_PWRKEY_RST_EN_SHIFT) 38 #define MTK_PMIC_HOMEKEY_RST \ 39 (MTK_PMIC_HOMEKEY_RST_EN_MASK << MTK_PMIC_HOMEKEY_RST_EN_SHIFT) 40 41 #define MTK_PMIC_PWRKEY_INDEX 0 42 #define MTK_PMIC_HOMEKEY_INDEX 1 43 #define MTK_PMIC_MAX_KEY_COUNT 2 44 45 struct mtk_pmic_keys_regs { 46 u32 deb_reg; 47 u32 deb_mask; 48 u32 intsel_reg; 49 u32 intsel_mask; 50 }; 51 52 #define MTK_PMIC_KEYS_REGS(_deb_reg, _deb_mask, \ 53 _intsel_reg, _intsel_mask) \ 54 { \ 55 .deb_reg = _deb_reg, \ 56 .deb_mask = _deb_mask, \ 57 .intsel_reg = _intsel_reg, \ 58 .intsel_mask = _intsel_mask, \ 59 } 60 61 struct mtk_pmic_regs { 62 const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT]; 63 u32 pmic_rst_reg; 64 }; 65 66 static const struct mtk_pmic_regs mt6397_regs = { 67 .keys_regs[MTK_PMIC_PWRKEY_INDEX] = 68 MTK_PMIC_KEYS_REGS(MT6397_CHRSTATUS, 69 0x8, MT6397_INT_RSV, 0x10), 70 .keys_regs[MTK_PMIC_HOMEKEY_INDEX] = 71 MTK_PMIC_KEYS_REGS(MT6397_OCSTATUS2, 72 0x10, MT6397_INT_RSV, 0x8), 73 .pmic_rst_reg = MT6397_TOP_RST_MISC, 74 }; 75 76 static const struct mtk_pmic_regs mt6323_regs = { 77 .keys_regs[MTK_PMIC_PWRKEY_INDEX] = 78 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS, 79 0x2, MT6323_INT_MISC_CON, 0x10), 80 .keys_regs[MTK_PMIC_HOMEKEY_INDEX] = 81 MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS, 82 0x4, MT6323_INT_MISC_CON, 0x8), 83 .pmic_rst_reg = MT6323_TOP_RST_MISC, 84 }; 85 86 struct mtk_pmic_keys_info { 87 struct mtk_pmic_keys *keys; 88 const struct mtk_pmic_keys_regs *regs; 89 unsigned int keycode; 90 int irq; 91 bool wakeup:1; 92 }; 93 94 struct mtk_pmic_keys { 95 struct input_dev *input_dev; 96 struct device *dev; 97 struct regmap *regmap; 98 struct mtk_pmic_keys_info keys[MTK_PMIC_MAX_KEY_COUNT]; 99 }; 100 101 enum mtk_pmic_keys_lp_mode { 102 LP_DISABLE, 103 LP_ONEKEY, 104 LP_TWOKEY, 105 }; 106 107 static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys, 108 u32 pmic_rst_reg) 109 { 110 int ret; 111 u32 long_press_mode, long_press_debounce; 112 113 ret = of_property_read_u32(keys->dev->of_node, 114 "power-off-time-sec", &long_press_debounce); 115 if (ret) 116 long_press_debounce = 0; 117 118 regmap_update_bits(keys->regmap, pmic_rst_reg, 119 MTK_PMIC_RST_DU_MASK << MTK_PMIC_RST_DU_SHIFT, 120 long_press_debounce << MTK_PMIC_RST_DU_SHIFT); 121 122 ret = of_property_read_u32(keys->dev->of_node, 123 "mediatek,long-press-mode", &long_press_mode); 124 if (ret) 125 long_press_mode = LP_DISABLE; 126 127 switch (long_press_mode) { 128 case LP_ONEKEY: 129 regmap_update_bits(keys->regmap, pmic_rst_reg, 130 MTK_PMIC_PWRKEY_RST, 131 MTK_PMIC_PWRKEY_RST); 132 regmap_update_bits(keys->regmap, pmic_rst_reg, 133 MTK_PMIC_HOMEKEY_RST, 134 0); 135 break; 136 case LP_TWOKEY: 137 regmap_update_bits(keys->regmap, pmic_rst_reg, 138 MTK_PMIC_PWRKEY_RST, 139 MTK_PMIC_PWRKEY_RST); 140 regmap_update_bits(keys->regmap, pmic_rst_reg, 141 MTK_PMIC_HOMEKEY_RST, 142 MTK_PMIC_HOMEKEY_RST); 143 break; 144 case LP_DISABLE: 145 regmap_update_bits(keys->regmap, pmic_rst_reg, 146 MTK_PMIC_PWRKEY_RST, 147 0); 148 regmap_update_bits(keys->regmap, pmic_rst_reg, 149 MTK_PMIC_HOMEKEY_RST, 150 0); 151 break; 152 default: 153 break; 154 } 155 } 156 157 static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data) 158 { 159 struct mtk_pmic_keys_info *info = data; 160 u32 key_deb, pressed; 161 162 regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb); 163 164 key_deb &= info->regs->deb_mask; 165 166 pressed = !key_deb; 167 168 input_report_key(info->keys->input_dev, info->keycode, pressed); 169 input_sync(info->keys->input_dev); 170 171 dev_dbg(info->keys->dev, "(%s) key =%d using PMIC\n", 172 pressed ? "pressed" : "released", info->keycode); 173 174 return IRQ_HANDLED; 175 } 176 177 static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys, 178 struct mtk_pmic_keys_info *info) 179 { 180 int ret; 181 182 info->keys = keys; 183 184 ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg, 185 info->regs->intsel_mask, 186 info->regs->intsel_mask); 187 if (ret < 0) 188 return ret; 189 190 ret = devm_request_threaded_irq(keys->dev, info->irq, NULL, 191 mtk_pmic_keys_irq_handler_thread, 192 IRQF_ONESHOT | IRQF_TRIGGER_HIGH, 193 "mtk-pmic-keys", info); 194 if (ret) { 195 dev_err(keys->dev, "Failed to request IRQ: %d: %d\n", 196 info->irq, ret); 197 return ret; 198 } 199 200 input_set_capability(keys->input_dev, EV_KEY, info->keycode); 201 202 return 0; 203 } 204 205 static int __maybe_unused mtk_pmic_keys_suspend(struct device *dev) 206 { 207 struct mtk_pmic_keys *keys = dev_get_drvdata(dev); 208 int index; 209 210 for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) { 211 if (keys->keys[index].wakeup) 212 enable_irq_wake(keys->keys[index].irq); 213 } 214 215 return 0; 216 } 217 218 static int __maybe_unused mtk_pmic_keys_resume(struct device *dev) 219 { 220 struct mtk_pmic_keys *keys = dev_get_drvdata(dev); 221 int index; 222 223 for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) { 224 if (keys->keys[index].wakeup) 225 disable_irq_wake(keys->keys[index].irq); 226 } 227 228 return 0; 229 } 230 231 static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend, 232 mtk_pmic_keys_resume); 233 234 static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = { 235 { 236 .compatible = "mediatek,mt6397-keys", 237 .data = &mt6397_regs, 238 }, { 239 .compatible = "mediatek,mt6323-keys", 240 .data = &mt6323_regs, 241 }, { 242 /* sentinel */ 243 } 244 }; 245 MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl); 246 247 static int mtk_pmic_keys_probe(struct platform_device *pdev) 248 { 249 int error, index = 0; 250 unsigned int keycount; 251 struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent); 252 struct device_node *node = pdev->dev.of_node, *child; 253 struct mtk_pmic_keys *keys; 254 const struct mtk_pmic_regs *mtk_pmic_regs; 255 struct input_dev *input_dev; 256 const struct of_device_id *of_id = 257 of_match_device(of_mtk_pmic_keys_match_tbl, &pdev->dev); 258 259 keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL); 260 if (!keys) 261 return -ENOMEM; 262 263 keys->dev = &pdev->dev; 264 keys->regmap = pmic_chip->regmap; 265 mtk_pmic_regs = of_id->data; 266 267 keys->input_dev = input_dev = devm_input_allocate_device(keys->dev); 268 if (!input_dev) { 269 dev_err(keys->dev, "input allocate device fail.\n"); 270 return -ENOMEM; 271 } 272 273 input_dev->name = "mtk-pmic-keys"; 274 input_dev->id.bustype = BUS_HOST; 275 input_dev->id.vendor = 0x0001; 276 input_dev->id.product = 0x0001; 277 input_dev->id.version = 0x0001; 278 279 keycount = of_get_available_child_count(node); 280 if (keycount > MTK_PMIC_MAX_KEY_COUNT) { 281 dev_err(keys->dev, "too many keys defined (%d)\n", keycount); 282 return -EINVAL; 283 } 284 285 for_each_child_of_node(node, child) { 286 keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index]; 287 288 keys->keys[index].irq = platform_get_irq(pdev, index); 289 if (keys->keys[index].irq < 0) 290 return keys->keys[index].irq; 291 292 error = of_property_read_u32(child, 293 "linux,keycodes", &keys->keys[index].keycode); 294 if (error) { 295 dev_err(keys->dev, 296 "failed to read key:%d linux,keycode property: %d\n", 297 index, error); 298 return error; 299 } 300 301 if (of_property_read_bool(child, "wakeup-source")) 302 keys->keys[index].wakeup = true; 303 304 error = mtk_pmic_key_setup(keys, &keys->keys[index]); 305 if (error) 306 return error; 307 308 index++; 309 } 310 311 error = input_register_device(input_dev); 312 if (error) { 313 dev_err(&pdev->dev, 314 "register input device failed (%d)\n", error); 315 return error; 316 } 317 318 mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs->pmic_rst_reg); 319 320 platform_set_drvdata(pdev, keys); 321 322 return 0; 323 } 324 325 static struct platform_driver pmic_keys_pdrv = { 326 .probe = mtk_pmic_keys_probe, 327 .driver = { 328 .name = "mtk-pmic-keys", 329 .of_match_table = of_mtk_pmic_keys_match_tbl, 330 .pm = &mtk_pmic_keys_pm_ops, 331 }, 332 }; 333 334 module_platform_driver(pmic_keys_pdrv); 335 336 MODULE_LICENSE("GPL v2"); 337 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>"); 338 MODULE_DESCRIPTION("MTK pmic-keys driver v0.1"); 339