This source file includes following definitions.
- mtk_pmic_keys_lp_reset_setup
- mtk_pmic_keys_irq_handler_thread
- mtk_pmic_key_setup
- mtk_pmic_keys_suspend
- mtk_pmic_keys_resume
- mtk_pmic_keys_probe
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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
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 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
321 static 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
330 module_platform_driver(pmic_keys_pdrv);
331
332 MODULE_LICENSE("GPL v2");
333 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
334 MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");