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
 36struct 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
 52struct mtk_pmic_regs {
 53	const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT];
 54	u32 pmic_rst_reg;
 55};
 56
 57static 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
 67static 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
 77struct 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
 85struct 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
 92enum mtk_pmic_keys_lp_mode {
 93	LP_DISABLE,
 94	LP_ONEKEY,
 95	LP_TWOKEY,
 96};
 97
 98static 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
148static 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
168static 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
196static 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
209static 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
222static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
223			mtk_pmic_keys_resume);
224
225static 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};
236MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl);
237
238static 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			of_node_put(child);
282			return keys->keys[index].irq;
283		}
284
285		error = of_property_read_u32(child,
286			"linux,keycodes", &keys->keys[index].keycode);
287		if (error) {
288			dev_err(keys->dev,
289				"failed to read key:%d linux,keycode property: %d\n",
290				index, error);
291			of_node_put(child);
292			return error;
293		}
294
295		if (of_property_read_bool(child, "wakeup-source"))
296			keys->keys[index].wakeup = true;
297
298		error = mtk_pmic_key_setup(keys, &keys->keys[index]);
299		if (error) {
300			of_node_put(child);
301			return error;
302		}
303
304		index++;
305	}
306
307	error = input_register_device(input_dev);
308	if (error) {
309		dev_err(&pdev->dev,
310			"register input device failed (%d)\n", error);
311		return error;
312	}
313
314	mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs->pmic_rst_reg);
315
316	platform_set_drvdata(pdev, keys);
317
318	return 0;
319}
320
321static struct platform_driver pmic_keys_pdrv = {
322	.probe = mtk_pmic_keys_probe,
323	.driver = {
324		   .name = "mtk-pmic-keys",
325		   .of_match_table = of_mtk_pmic_keys_match_tbl,
326		   .pm = &mtk_pmic_keys_pm_ops,
327	},
328};
329
330module_platform_driver(pmic_keys_pdrv);
331
332MODULE_LICENSE("GPL v2");
333MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
334MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");