projects/linux·blob master · refs

267 lines · 6.9 KiB

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/property.h>
15#include <linux/workqueue.h>
16#include <linux/regmap.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
22struct 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
37struct 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
47static 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
62static 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
77static void da9063_poll_on(struct work_struct *work)
78{
79 struct da9063_onkey *onkey = container_of(work,
80 struct da9063_onkey,
81 work.work);
82 const struct da906x_chip_config *config = onkey->config;
83 unsigned int val;
84 int fault_log = 0;
85 bool poll = true;
86 int error;
87
88 /* Poll to see when the pin is released */
89 error = regmap_read(onkey->regmap,
90 config->onkey_status,
91 &val);
92 if (error) {
93 dev_err(onkey->dev,
94 "Failed to read ON status: %d\n", error);
95 goto err_poll;
96 }
97
98 if (!(val & config->onkey_nonkey_mask)) {
99 error = regmap_update_bits(onkey->regmap,
100 config->onkey_pwr_signalling,
101 config->onkey_nonkey_lock_mask,
102 0);
103 if (error) {
104 dev_err(onkey->dev,
105 "Failed to reset the Key Delay %d\n", error);
106 goto err_poll;
107 }
108
109 input_report_key(onkey->input, KEY_POWER, 0);
110 input_sync(onkey->input);
111
112 poll = false;
113 }
114
115 /*
116 * If the fault log KEY_RESET is detected, then clear it
117 * and shut down the system.
118 */
119 error = regmap_read(onkey->regmap,
120 config->onkey_fault_log,
121 &fault_log);
122 if (error) {
123 dev_warn(&onkey->input->dev,
124 "Cannot read FAULT_LOG: %d\n", error);
125 } else if (fault_log & config->onkey_key_reset_mask) {
126 error = regmap_write(onkey->regmap,
127 config->onkey_fault_log,
128 config->onkey_key_reset_mask);
129 if (error) {
130 dev_warn(&onkey->input->dev,
131 "Cannot reset KEY_RESET fault log: %d\n",
132 error);
133 } else {
134 /* at this point we do any S/W housekeeping
135 * and then send shutdown command
136 */
137 dev_dbg(&onkey->input->dev,
138 "Sending SHUTDOWN to PMIC ...\n");
139 error = regmap_write(onkey->regmap,
140 config->onkey_shutdown,
141 config->onkey_shutdown_mask);
142 if (error)
143 dev_err(&onkey->input->dev,
144 "Cannot SHUTDOWN PMIC: %d\n",
145 error);
146 }
147 }
148
149err_poll:
150 if (poll)
151 schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
152}
153
154static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
155{
156 struct da9063_onkey *onkey = data;
157 const struct da906x_chip_config *config = onkey->config;
158 unsigned int val;
159 int error;
160
161 error = regmap_read(onkey->regmap,
162 config->onkey_status,
163 &val);
164 if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
165 input_report_key(onkey->input, KEY_POWER, 1);
166 input_sync(onkey->input);
167 schedule_delayed_work(&onkey->work, 0);
168 dev_dbg(onkey->dev, "KEY_POWER long press.\n");
169 } else {
170 input_report_key(onkey->input, KEY_POWER, 1);
171 input_sync(onkey->input);
172 input_report_key(onkey->input, KEY_POWER, 0);
173 input_sync(onkey->input);
174 dev_dbg(onkey->dev, "KEY_POWER short press.\n");
175 }
176
177 return IRQ_HANDLED;
178}
179
180static int da9063_onkey_probe(struct platform_device *pdev)
181{
182 struct da9063_onkey *onkey;
183 int error;
184 int irq;
185
186 onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
187 GFP_KERNEL);
188 if (!onkey)
189 return -ENOMEM;
190
191 onkey->config = device_get_match_data(&pdev->dev);
192 if (!onkey->config)
193 return -ENXIO;
194
195 onkey->dev = &pdev->dev;
196
197 onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
198 if (!onkey->regmap)
199 return dev_err_probe(&pdev->dev, -ENXIO,
200 "Parent regmap unavailable.\n");
201
202 onkey->key_power = !device_property_read_bool(&pdev->dev,
203 "dlg,disable-key-power");
204
205 onkey->input = devm_input_allocate_device(&pdev->dev);
206 if (!onkey->input)
207 return -ENOMEM;
208
209 onkey->input->name = onkey->config->name;
210 snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
211 onkey->config->name);
212 onkey->input->phys = onkey->phys;
213
214 input_set_capability(onkey->input, EV_KEY, KEY_POWER);
215
216 error = devm_delayed_work_autocancel(&pdev->dev, &onkey->work,
217 da9063_poll_on);
218 if (error)
219 return error;
220
221 irq = platform_get_irq_byname(pdev, "ONKEY");
222 if (irq < 0)
223 return irq;
224
225 error = devm_request_threaded_irq(&pdev->dev, irq,
226 NULL, da9063_onkey_irq_handler,
227 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
228 "ONKEY", onkey);
229 if (error)
230 return dev_err_probe(&pdev->dev, error,
231 "Failed to allocate onkey IRQ\n");
232
233 error = dev_pm_set_wake_irq(&pdev->dev, irq);
234 if (error)
235 dev_warn(&pdev->dev,
236 "Failed to set IRQ %d as a wake IRQ: %d\n",
237 irq, error);
238 else
239 device_init_wakeup(&pdev->dev, true);
240
241 error = input_register_device(onkey->input);
242 if (error)
243 return error;
244
245 return 0;
246}
247
248static const struct of_device_id da9063_compatible_reg_id_table[] = {
249 { .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
250 { .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
251 { }
252};
253MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
254
255static struct platform_driver da9063_onkey_driver = {
256 .probe = da9063_onkey_probe,
257 .driver = {
258 .name = DA9063_DRVNAME_ONKEY,
259 .of_match_table = da9063_compatible_reg_id_table,
260 },
261};
262module_platform_driver(da9063_onkey_driver);
263
264MODULE_AUTHOR("S Twiss <[email protected]>");
265MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
266MODULE_LICENSE("GPL");
267MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);