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