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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/module.h>
8#include <linux/errno.h>
9#include <linux/input.h>
10#include <linux/interrupt.h>
11#include <linux/platform_device.h>
12#include <linux/workqueue.h>
13#include <linux/regmap.h>
14#include <linux/of.h>
15#include <linux/mfd/da9063/core.h>
16#include <linux/mfd/da9063/registers.h>
17#include <linux/mfd/da9062/core.h>
18#include <linux/mfd/da9062/registers.h>
19
20struct da906x_chip_config {
21 /* REGS */
22 int onkey_status;
23 int onkey_pwr_signalling;
24 int onkey_fault_log;
25 int onkey_shutdown;
26 /* MASKS */
27 int onkey_nonkey_mask;
28 int onkey_nonkey_lock_mask;
29 int onkey_key_reset_mask;
30 int onkey_shutdown_mask;
31 /* NAMES */
32 const char *name;
33};
34
35struct da9063_onkey {
36 struct delayed_work work;
37 struct input_dev *input;
38 struct device *dev;
39 struct regmap *regmap;
40 const struct da906x_chip_config *config;
41 char phys[32];
42 bool key_power;
43};
44
45static const struct da906x_chip_config da9063_regs = {
46 /* REGS */
47 .onkey_status = DA9063_REG_STATUS_A,
48 .onkey_pwr_signalling = DA9063_REG_CONTROL_B,
49 .onkey_fault_log = DA9063_REG_FAULT_LOG,
50 .onkey_shutdown = DA9063_REG_CONTROL_F,
51 /* MASKS */
52 .onkey_nonkey_mask = DA9063_NONKEY,
53 .onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
54 .onkey_key_reset_mask = DA9063_KEY_RESET,
55 .onkey_shutdown_mask = DA9063_SHUTDOWN,
56 /* NAMES */
57 .name = DA9063_DRVNAME_ONKEY,
58};
59
60static const struct da906x_chip_config da9062_regs = {
61 /* REGS */
62 .onkey_status = DA9062AA_STATUS_A,
63 .onkey_pwr_signalling = DA9062AA_CONTROL_B,
64 .onkey_fault_log = DA9062AA_FAULT_LOG,
65 .onkey_shutdown = DA9062AA_CONTROL_F,
66 /* MASKS */
67 .onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
68 .onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
69 .onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
70 .onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
71 /* NAMES */
72 .name = "da9062-onkey",
73};
74
75static const struct of_device_id da9063_compatible_reg_id_table[] = {
76 { .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
77 { .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
78 { },
79};
80MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
81
82static void da9063_poll_on(struct work_struct *work)
83{
84 struct da9063_onkey *onkey = container_of(work,
85 struct da9063_onkey,
86 work.work);
87 const struct da906x_chip_config *config = onkey->config;
88 unsigned int val;
89 int fault_log = 0;
90 bool poll = true;
91 int error;
92
93 /* Poll to see when the pin is released */
94 error = regmap_read(onkey->regmap,
95 config->onkey_status,
96 &val);
97 if (error) {
98 dev_err(onkey->dev,
99 "Failed to read ON status: %d\n", error);
100 goto err_poll;
101 }
102
103 if (!(val & config->onkey_nonkey_mask)) {
104 error = regmap_update_bits(onkey->regmap,
105 config->onkey_pwr_signalling,
106 config->onkey_nonkey_lock_mask,
107 0);
108 if (error) {
109 dev_err(onkey->dev,
110 "Failed to reset the Key Delay %d\n", error);
111 goto err_poll;
112 }
113
114 input_report_key(onkey->input, KEY_POWER, 0);
115 input_sync(onkey->input);
116
117 poll = false;
118 }
119
120 /*
121 * If the fault log KEY_RESET is detected, then clear it
122 * and shut down the system.
123 */
124 error = regmap_read(onkey->regmap,
125 config->onkey_fault_log,
126 &fault_log);
127 if (error) {
128 dev_warn(&onkey->input->dev,
129 "Cannot read FAULT_LOG: %d\n", error);
130 } else if (fault_log & config->onkey_key_reset_mask) {
131 error = regmap_write(onkey->regmap,
132 config->onkey_fault_log,
133 config->onkey_key_reset_mask);
134 if (error) {
135 dev_warn(&onkey->input->dev,
136 "Cannot reset KEY_RESET fault log: %d\n",
137 error);
138 } else {
139 /* at this point we do any S/W housekeeping
140 * and then send shutdown command
141 */
142 dev_dbg(&onkey->input->dev,
143 "Sending SHUTDOWN to PMIC ...\n");
144 error = regmap_write(onkey->regmap,
145 config->onkey_shutdown,
146 config->onkey_shutdown_mask);
147 if (error)
148 dev_err(&onkey->input->dev,
149 "Cannot SHUTDOWN PMIC: %d\n",
150 error);
151 }
152 }
153
154err_poll:
155 if (poll)
156 schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
157}
158
159static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
160{
161 struct da9063_onkey *onkey = data;
162 const struct da906x_chip_config *config = onkey->config;
163 unsigned int val;
164 int error;
165
166 error = regmap_read(onkey->regmap,
167 config->onkey_status,
168 &val);
169 if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
170 input_report_key(onkey->input, KEY_POWER, 1);
171 input_sync(onkey->input);
172 schedule_delayed_work(&onkey->work, 0);
173 dev_dbg(onkey->dev, "KEY_POWER long press.\n");
174 } else {
175 input_report_key(onkey->input, KEY_POWER, 1);
176 input_sync(onkey->input);
177 input_report_key(onkey->input, KEY_POWER, 0);
178 input_sync(onkey->input);
179 dev_dbg(onkey->dev, "KEY_POWER short press.\n");
180 }
181
182 return IRQ_HANDLED;
183}
184
185static void da9063_cancel_poll(void *data)
186{
187 struct da9063_onkey *onkey = data;
188
189 cancel_delayed_work_sync(&onkey->work);
190}
191
192static int da9063_onkey_probe(struct platform_device *pdev)
193{
194 struct da9063_onkey *onkey;
195 const struct of_device_id *match;
196 int irq;
197 int error;
198
199 match = of_match_node(da9063_compatible_reg_id_table,
200 pdev->dev.of_node);
201 if (!match)
202 return -ENXIO;
203
204 onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
205 GFP_KERNEL);
206 if (!onkey) {
207 dev_err(&pdev->dev, "Failed to allocate memory.\n");
208 return -ENOMEM;
209 }
210
211 onkey->config = match->data;
212 onkey->dev = &pdev->dev;
213
214 onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
215 if (!onkey->regmap) {
216 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
217 return -ENXIO;
218 }
219
220 onkey->key_power = !of_property_read_bool(pdev->dev.of_node,
221 "dlg,disable-key-power");
222
223 onkey->input = devm_input_allocate_device(&pdev->dev);
224 if (!onkey->input) {
225 dev_err(&pdev->dev, "Failed to allocated input device.\n");
226 return -ENOMEM;
227 }
228
229 onkey->input->name = onkey->config->name;
230 snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
231 onkey->config->name);
232 onkey->input->phys = onkey->phys;
233 onkey->input->dev.parent = &pdev->dev;
234
235 input_set_capability(onkey->input, EV_KEY, KEY_POWER);
236
237 INIT_DELAYED_WORK(&onkey->work, da9063_poll_on);
238
239 error = devm_add_action(&pdev->dev, da9063_cancel_poll, onkey);
240 if (error) {
241 dev_err(&pdev->dev,
242 "Failed to add cancel poll action: %d\n",
243 error);
244 return error;
245 }
246
247 irq = platform_get_irq_byname(pdev, "ONKEY");
248 if (irq < 0)
249 return irq;
250
251 error = devm_request_threaded_irq(&pdev->dev, irq,
252 NULL, da9063_onkey_irq_handler,
253 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
254 "ONKEY", onkey);
255 if (error) {
256 dev_err(&pdev->dev,
257 "Failed to request IRQ %d: %d\n", irq, error);
258 return error;
259 }
260
261 error = input_register_device(onkey->input);
262 if (error) {
263 dev_err(&pdev->dev,
264 "Failed to register input device: %d\n", error);
265 return error;
266 }
267
268 return 0;
269}
270
271static struct platform_driver da9063_onkey_driver = {
272 .probe = da9063_onkey_probe,
273 .driver = {
274 .name = DA9063_DRVNAME_ONKEY,
275 .of_match_table = da9063_compatible_reg_id_table,
276 },
277};
278module_platform_driver(da9063_onkey_driver);
279
280MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
281MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
282MODULE_LICENSE("GPL");
283MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);