1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * OnKey device driver for DA9063, DA9062 and DA9061 PMICs
4 * Copyright (C) 2015 Dialog Semiconductor Ltd.
5 */
6
7 #include <linux/devm-helpers.h>
8 #include <linux/module.h>
9 #include <linux/errno.h>
10 #include <linux/input.h>
11 #include <linux/interrupt.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_wakeirq.h>
14 #include <linux/workqueue.h>
15 #include <linux/regmap.h>
16 #include <linux/of.h>
17 #include <linux/mfd/da9063/core.h>
18 #include <linux/mfd/da9063/registers.h>
19 #include <linux/mfd/da9062/core.h>
20 #include <linux/mfd/da9062/registers.h>
21
22 struct da906x_chip_config {
23 /* REGS */
24 int onkey_status;
25 int onkey_pwr_signalling;
26 int onkey_fault_log;
27 int onkey_shutdown;
28 /* MASKS */
29 int onkey_nonkey_mask;
30 int onkey_nonkey_lock_mask;
31 int onkey_key_reset_mask;
32 int onkey_shutdown_mask;
33 /* NAMES */
34 const char *name;
35 };
36
37 struct da9063_onkey {
38 struct delayed_work work;
39 struct input_dev *input;
40 struct device *dev;
41 struct regmap *regmap;
42 const struct da906x_chip_config *config;
43 char phys[32];
44 bool key_power;
45 };
46
47 static const struct da906x_chip_config da9063_regs = {
48 /* REGS */
49 .onkey_status = DA9063_REG_STATUS_A,
50 .onkey_pwr_signalling = DA9063_REG_CONTROL_B,
51 .onkey_fault_log = DA9063_REG_FAULT_LOG,
52 .onkey_shutdown = DA9063_REG_CONTROL_F,
53 /* MASKS */
54 .onkey_nonkey_mask = DA9063_NONKEY,
55 .onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
56 .onkey_key_reset_mask = DA9063_KEY_RESET,
57 .onkey_shutdown_mask = DA9063_SHUTDOWN,
58 /* NAMES */
59 .name = DA9063_DRVNAME_ONKEY,
60 };
61
62 static const struct da906x_chip_config da9062_regs = {
63 /* REGS */
64 .onkey_status = DA9062AA_STATUS_A,
65 .onkey_pwr_signalling = DA9062AA_CONTROL_B,
66 .onkey_fault_log = DA9062AA_FAULT_LOG,
67 .onkey_shutdown = DA9062AA_CONTROL_F,
68 /* MASKS */
69 .onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
70 .onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
71 .onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
72 .onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
73 /* NAMES */
74 .name = "da9062-onkey",
75 };
76
77 static const struct of_device_id da9063_compatible_reg_id_table[] = {
78 { .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
79 { .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
80 { },
81 };
82 MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
83
da9063_poll_on(struct work_struct * work)84 static void da9063_poll_on(struct work_struct *work)
85 {
86 struct da9063_onkey *onkey = container_of(work,
87 struct da9063_onkey,
88 work.work);
89 const struct da906x_chip_config *config = onkey->config;
90 unsigned int val;
91 int fault_log = 0;
92 bool poll = true;
93 int error;
94
95 /* Poll to see when the pin is released */
96 error = regmap_read(onkey->regmap,
97 config->onkey_status,
98 &val);
99 if (error) {
100 dev_err(onkey->dev,
101 "Failed to read ON status: %d\n", error);
102 goto err_poll;
103 }
104
105 if (!(val & config->onkey_nonkey_mask)) {
106 error = regmap_update_bits(onkey->regmap,
107 config->onkey_pwr_signalling,
108 config->onkey_nonkey_lock_mask,
109 0);
110 if (error) {
111 dev_err(onkey->dev,
112 "Failed to reset the Key Delay %d\n", error);
113 goto err_poll;
114 }
115
116 input_report_key(onkey->input, KEY_POWER, 0);
117 input_sync(onkey->input);
118
119 poll = false;
120 }
121
122 /*
123 * If the fault log KEY_RESET is detected, then clear it
124 * and shut down the system.
125 */
126 error = regmap_read(onkey->regmap,
127 config->onkey_fault_log,
128 &fault_log);
129 if (error) {
130 dev_warn(&onkey->input->dev,
131 "Cannot read FAULT_LOG: %d\n", error);
132 } else if (fault_log & config->onkey_key_reset_mask) {
133 error = regmap_write(onkey->regmap,
134 config->onkey_fault_log,
135 config->onkey_key_reset_mask);
136 if (error) {
137 dev_warn(&onkey->input->dev,
138 "Cannot reset KEY_RESET fault log: %d\n",
139 error);
140 } else {
141 /* at this point we do any S/W housekeeping
142 * and then send shutdown command
143 */
144 dev_dbg(&onkey->input->dev,
145 "Sending SHUTDOWN to PMIC ...\n");
146 error = regmap_write(onkey->regmap,
147 config->onkey_shutdown,
148 config->onkey_shutdown_mask);
149 if (error)
150 dev_err(&onkey->input->dev,
151 "Cannot SHUTDOWN PMIC: %d\n",
152 error);
153 }
154 }
155
156 err_poll:
157 if (poll)
158 schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
159 }
160
da9063_onkey_irq_handler(int irq,void * data)161 static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
162 {
163 struct da9063_onkey *onkey = data;
164 const struct da906x_chip_config *config = onkey->config;
165 unsigned int val;
166 int error;
167
168 error = regmap_read(onkey->regmap,
169 config->onkey_status,
170 &val);
171 if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
172 input_report_key(onkey->input, KEY_POWER, 1);
173 input_sync(onkey->input);
174 schedule_delayed_work(&onkey->work, 0);
175 dev_dbg(onkey->dev, "KEY_POWER long press.\n");
176 } else {
177 input_report_key(onkey->input, KEY_POWER, 1);
178 input_sync(onkey->input);
179 input_report_key(onkey->input, KEY_POWER, 0);
180 input_sync(onkey->input);
181 dev_dbg(onkey->dev, "KEY_POWER short press.\n");
182 }
183
184 return IRQ_HANDLED;
185 }
186
da9063_onkey_probe(struct platform_device * pdev)187 static int da9063_onkey_probe(struct platform_device *pdev)
188 {
189 struct da9063_onkey *onkey;
190 const struct of_device_id *match;
191 int irq;
192 int error;
193
194 match = of_match_node(da9063_compatible_reg_id_table,
195 pdev->dev.of_node);
196 if (!match)
197 return -ENXIO;
198
199 onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
200 GFP_KERNEL);
201 if (!onkey) {
202 dev_err(&pdev->dev, "Failed to allocate memory.\n");
203 return -ENOMEM;
204 }
205
206 onkey->config = match->data;
207 onkey->dev = &pdev->dev;
208
209 onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
210 if (!onkey->regmap) {
211 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
212 return -ENXIO;
213 }
214
215 onkey->key_power = !of_property_read_bool(pdev->dev.of_node,
216 "dlg,disable-key-power");
217
218 onkey->input = devm_input_allocate_device(&pdev->dev);
219 if (!onkey->input) {
220 dev_err(&pdev->dev, "Failed to allocated input device.\n");
221 return -ENOMEM;
222 }
223
224 onkey->input->name = onkey->config->name;
225 snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
226 onkey->config->name);
227 onkey->input->phys = onkey->phys;
228 onkey->input->dev.parent = &pdev->dev;
229
230 input_set_capability(onkey->input, EV_KEY, KEY_POWER);
231
232 error = devm_delayed_work_autocancel(&pdev->dev, &onkey->work,
233 da9063_poll_on);
234 if (error) {
235 dev_err(&pdev->dev,
236 "Failed to add cancel poll action: %d\n",
237 error);
238 return error;
239 }
240
241 irq = platform_get_irq_byname(pdev, "ONKEY");
242 if (irq < 0)
243 return irq;
244
245 error = devm_request_threaded_irq(&pdev->dev, irq,
246 NULL, da9063_onkey_irq_handler,
247 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
248 "ONKEY", onkey);
249 if (error) {
250 dev_err(&pdev->dev,
251 "Failed to request IRQ %d: %d\n", irq, error);
252 return error;
253 }
254
255 error = dev_pm_set_wake_irq(&pdev->dev, irq);
256 if (error)
257 dev_warn(&pdev->dev,
258 "Failed to set IRQ %d as a wake IRQ: %d\n",
259 irq, error);
260 else
261 device_init_wakeup(&pdev->dev, true);
262
263 error = input_register_device(onkey->input);
264 if (error) {
265 dev_err(&pdev->dev,
266 "Failed to register input device: %d\n", error);
267 return error;
268 }
269
270 return 0;
271 }
272
273 static struct platform_driver da9063_onkey_driver = {
274 .probe = da9063_onkey_probe,
275 .driver = {
276 .name = DA9063_DRVNAME_ONKEY,
277 .of_match_table = da9063_compatible_reg_id_table,
278 },
279 };
280 module_platform_driver(da9063_onkey_driver);
281
282 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
283 MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
284 MODULE_LICENSE("GPL");
285 MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);
286