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

source code of linux/drivers/input/misc/da9063_onkey.c