1/*
2 * OnKey device driver for DA9063, DA9062 and DA9061 PMICs
3 * Copyright (C) 2015 Dialog Semiconductor Ltd.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/module.h>
17#include <linux/errno.h>
18#include <linux/input.h>
19#include <linux/interrupt.h>
20#include <linux/platform_device.h>
21#include <linux/workqueue.h>
22#include <linux/regmap.h>
23#include <linux/of.h>
24#include <linux/mfd/da9063/core.h>
25#include <linux/mfd/da9063/pdata.h>
26#include <linux/mfd/da9063/registers.h>
27#include <linux/mfd/da9062/core.h>
28#include <linux/mfd/da9062/registers.h>
29
30struct da906x_chip_config {
31 /* REGS */
32 int onkey_status;
33 int onkey_pwr_signalling;
34 int onkey_fault_log;
35 int onkey_shutdown;
36 /* MASKS */
37 int onkey_nonkey_mask;
38 int onkey_nonkey_lock_mask;
39 int onkey_key_reset_mask;
40 int onkey_shutdown_mask;
41 /* NAMES */
42 const char *name;
43};
44
45struct da9063_onkey {
46 struct delayed_work work;
47 struct input_dev *input;
48 struct device *dev;
49 struct regmap *regmap;
50 const struct da906x_chip_config *config;
51 char phys[32];
52 bool key_power;
53};
54
55static const struct da906x_chip_config da9063_regs = {
56 /* REGS */
57 .onkey_status = DA9063_REG_STATUS_A,
58 .onkey_pwr_signalling = DA9063_REG_CONTROL_B,
59 .onkey_fault_log = DA9063_REG_FAULT_LOG,
60 .onkey_shutdown = DA9063_REG_CONTROL_F,
61 /* MASKS */
62 .onkey_nonkey_mask = DA9063_NONKEY,
63 .onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
64 .onkey_key_reset_mask = DA9063_KEY_RESET,
65 .onkey_shutdown_mask = DA9063_SHUTDOWN,
66 /* NAMES */
67 .name = DA9063_DRVNAME_ONKEY,
68};
69
70static const struct da906x_chip_config da9062_regs = {
71 /* REGS */
72 .onkey_status = DA9062AA_STATUS_A,
73 .onkey_pwr_signalling = DA9062AA_CONTROL_B,
74 .onkey_fault_log = DA9062AA_FAULT_LOG,
75 .onkey_shutdown = DA9062AA_CONTROL_F,
76 /* MASKS */
77 .onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
78 .onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
79 .onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
80 .onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
81 /* NAMES */
82 .name = "da9062-onkey",
83};
84
85static const struct of_device_id da9063_compatible_reg_id_table[] = {
86 { .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
87 { .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
88 { },
89};
90MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
91
92static void da9063_poll_on(struct work_struct *work)
93{
94 struct da9063_onkey *onkey = container_of(work,
95 struct da9063_onkey,
96 work.work);
97 const struct da906x_chip_config *config = onkey->config;
98 unsigned int val;
99 int fault_log = 0;
100 bool poll = true;
101 int error;
102
103 /* Poll to see when the pin is released */
104 error = regmap_read(onkey->regmap,
105 config->onkey_status,
106 &val);
107 if (error) {
108 dev_err(onkey->dev,
109 "Failed to read ON status: %d\n", error);
110 goto err_poll;
111 }
112
113 if (!(val & config->onkey_nonkey_mask)) {
114 error = regmap_update_bits(onkey->regmap,
115 config->onkey_pwr_signalling,
116 config->onkey_nonkey_lock_mask,
117 0);
118 if (error) {
119 dev_err(onkey->dev,
120 "Failed to reset the Key Delay %d\n", error);
121 goto err_poll;
122 }
123
124 input_report_key(onkey->input, KEY_POWER, 0);
125 input_sync(onkey->input);
126
127 poll = false;
128 }
129
130 /*
131 * If the fault log KEY_RESET is detected, then clear it
132 * and shut down the system.
133 */
134 error = regmap_read(onkey->regmap,
135 config->onkey_fault_log,
136 &fault_log);
137 if (error) {
138 dev_warn(&onkey->input->dev,
139 "Cannot read FAULT_LOG: %d\n", error);
140 } else if (fault_log & config->onkey_key_reset_mask) {
141 error = regmap_write(onkey->regmap,
142 config->onkey_fault_log,
143 config->onkey_key_reset_mask);
144 if (error) {
145 dev_warn(&onkey->input->dev,
146 "Cannot reset KEY_RESET fault log: %d\n",
147 error);
148 } else {
149 /* at this point we do any S/W housekeeping
150 * and then send shutdown command
151 */
152 dev_dbg(&onkey->input->dev,
153 "Sending SHUTDOWN to PMIC ...\n");
154 error = regmap_write(onkey->regmap,
155 config->onkey_shutdown,
156 config->onkey_shutdown_mask);
157 if (error)
158 dev_err(&onkey->input->dev,
159 "Cannot SHUTDOWN PMIC: %d\n",
160 error);
161 }
162 }
163
164err_poll:
165 if (poll)
166 schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
167}
168
169static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
170{
171 struct da9063_onkey *onkey = data;
172 const struct da906x_chip_config *config = onkey->config;
173 unsigned int val;
174 int error;
175
176 error = regmap_read(onkey->regmap,
177 config->onkey_status,
178 &val);
179 if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
180 input_report_key(onkey->input, KEY_POWER, 1);
181 input_sync(onkey->input);
182 schedule_delayed_work(&onkey->work, 0);
183 dev_dbg(onkey->dev, "KEY_POWER long press.\n");
184 } else {
185 input_report_key(onkey->input, KEY_POWER, 1);
186 input_sync(onkey->input);
187 input_report_key(onkey->input, KEY_POWER, 0);
188 input_sync(onkey->input);
189 dev_dbg(onkey->dev, "KEY_POWER short press.\n");
190 }
191
192 return IRQ_HANDLED;
193}
194
195static void da9063_cancel_poll(void *data)
196{
197 struct da9063_onkey *onkey = data;
198
199 cancel_delayed_work_sync(&onkey->work);
200}
201
202static int da9063_onkey_probe(struct platform_device *pdev)
203{
204 struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
205 struct da9063_pdata *pdata = dev_get_platdata(da9063->dev);
206 struct da9063_onkey *onkey;
207 const struct of_device_id *match;
208 int irq;
209 int error;
210
211 match = of_match_node(da9063_compatible_reg_id_table,
212 pdev->dev.of_node);
213 if (!match)
214 return -ENXIO;
215
216 onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
217 GFP_KERNEL);
218 if (!onkey) {
219 dev_err(&pdev->dev, "Failed to allocate memory.\n");
220 return -ENOMEM;
221 }
222
223 onkey->config = match->data;
224 onkey->dev = &pdev->dev;
225
226 onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
227 if (!onkey->regmap) {
228 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
229 return -ENXIO;
230 }
231
232 if (pdata)
233 onkey->key_power = pdata->key_power;
234 else
235 onkey->key_power =
236 !of_property_read_bool(pdev->dev.of_node,
237 "dlg,disable-key-power");
238
239 onkey->input = devm_input_allocate_device(&pdev->dev);
240 if (!onkey->input) {
241 dev_err(&pdev->dev, "Failed to allocated input device.\n");
242 return -ENOMEM;
243 }
244
245 onkey->input->name = onkey->config->name;
246 snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
247 onkey->config->name);
248 onkey->input->phys = onkey->phys;
249 onkey->input->dev.parent = &pdev->dev;
250
251 if (onkey->key_power)
252 input_set_capability(onkey->input, EV_KEY, KEY_POWER);
253
254 input_set_capability(onkey->input, EV_KEY, KEY_SLEEP);
255
256 INIT_DELAYED_WORK(&onkey->work, da9063_poll_on);
257
258 error = devm_add_action(&pdev->dev, da9063_cancel_poll, onkey);
259 if (error) {
260 dev_err(&pdev->dev,
261 "Failed to add cancel poll action: %d\n",
262 error);
263 return error;
264 }
265
266 irq = platform_get_irq_byname(pdev, "ONKEY");
267 if (irq < 0) {
268 error = irq;
269 dev_err(&pdev->dev, "Failed to get platform IRQ: %d\n", error);
270 return error;
271 }
272
273 error = devm_request_threaded_irq(&pdev->dev, irq,
274 NULL, da9063_onkey_irq_handler,
275 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
276 "ONKEY", onkey);
277 if (error) {
278 dev_err(&pdev->dev,
279 "Failed to request IRQ %d: %d\n", irq, error);
280 return error;
281 }
282
283 error = input_register_device(onkey->input);
284 if (error) {
285 dev_err(&pdev->dev,
286 "Failed to register input device: %d\n", error);
287 return error;
288 }
289
290 return 0;
291}
292
293static struct platform_driver da9063_onkey_driver = {
294 .probe = da9063_onkey_probe,
295 .driver = {
296 .name = DA9063_DRVNAME_ONKEY,
297 .of_match_table = da9063_compatible_reg_id_table,
298 },
299};
300module_platform_driver(da9063_onkey_driver);
301
302MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
303MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
304MODULE_LICENSE("GPL");
305MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);
306