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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Touchkey driver for MELFAS MCS5000/5080 controller
4 *
5 * Copyright (C) 2010 Samsung Electronics Co.Ltd
6 * Author: HeungJun Kim <riverful.kim@samsung.com>
7 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
8 */
9
10#include <linux/module.h>
11#include <linux/i2c.h>
12#include <linux/interrupt.h>
13#include <linux/input.h>
14#include <linux/irq.h>
15#include <linux/slab.h>
16#include <linux/platform_data/mcs.h>
17#include <linux/pm.h>
18
19/* MCS5000 Touchkey */
20#define MCS5000_TOUCHKEY_STATUS 0x04
21#define MCS5000_TOUCHKEY_STATUS_PRESS 7
22#define MCS5000_TOUCHKEY_FW 0x0a
23#define MCS5000_TOUCHKEY_BASE_VAL 0x61
24
25/* MCS5080 Touchkey */
26#define MCS5080_TOUCHKEY_STATUS 0x00
27#define MCS5080_TOUCHKEY_STATUS_PRESS 3
28#define MCS5080_TOUCHKEY_FW 0x01
29#define MCS5080_TOUCHKEY_BASE_VAL 0x1
30
31enum mcs_touchkey_type {
32 MCS5000_TOUCHKEY,
33 MCS5080_TOUCHKEY,
34};
35
36struct mcs_touchkey_chip {
37 unsigned int status_reg;
38 unsigned int pressbit;
39 unsigned int press_invert;
40 unsigned int baseval;
41};
42
43struct mcs_touchkey_data {
44 void (*poweron)(bool);
45
46 struct i2c_client *client;
47 struct input_dev *input_dev;
48 struct mcs_touchkey_chip chip;
49 unsigned int key_code;
50 unsigned int key_val;
51 unsigned short keycodes[];
52};
53
54static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
55{
56 struct mcs_touchkey_data *data = dev_id;
57 struct mcs_touchkey_chip *chip = &data->chip;
58 struct i2c_client *client = data->client;
59 struct input_dev *input = data->input_dev;
60 unsigned int key_val;
61 unsigned int pressed;
62 int val;
63
64 val = i2c_smbus_read_byte_data(client, chip->status_reg);
65 if (val < 0) {
66 dev_err(&client->dev, "i2c read error [%d]\n", val);
67 goto out;
68 }
69
70 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
71 if (chip->press_invert)
72 pressed ^= chip->press_invert;
73
74 /* key_val is 0 when released, so we should use key_val of press. */
75 if (pressed) {
76 key_val = val & (0xff >> (8 - chip->pressbit));
77 if (!key_val)
78 goto out;
79 key_val -= chip->baseval;
80 data->key_code = data->keycodes[key_val];
81 data->key_val = key_val;
82 }
83
84 input_event(input, EV_MSC, MSC_SCAN, data->key_val);
85 input_report_key(input, data->key_code, pressed);
86 input_sync(input);
87
88 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
89 pressed ? "pressed" : "released");
90
91 out:
92 return IRQ_HANDLED;
93}
94
95static int mcs_touchkey_probe(struct i2c_client *client)
96{
97 const struct i2c_device_id *id = i2c_client_get_device_id(client);
98 const struct mcs_platform_data *pdata;
99 struct mcs_touchkey_data *data;
100 struct input_dev *input_dev;
101 unsigned int fw_reg;
102 int fw_ver;
103 int error;
104 int i;
105
106 pdata = dev_get_platdata(&client->dev);
107 if (!pdata) {
108 dev_err(&client->dev, "no platform data defined\n");
109 return -EINVAL;
110 }
111
112 data = kzalloc(struct_size(data, keycodes, pdata->key_maxval + 1),
113 GFP_KERNEL);
114 input_dev = input_allocate_device();
115 if (!data || !input_dev) {
116 dev_err(&client->dev, "Failed to allocate memory\n");
117 error = -ENOMEM;
118 goto err_free_mem;
119 }
120
121 data->client = client;
122 data->input_dev = input_dev;
123
124 if (id->driver_data == MCS5000_TOUCHKEY) {
125 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
126 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
127 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
128 fw_reg = MCS5000_TOUCHKEY_FW;
129 } else {
130 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
131 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
132 data->chip.press_invert = 1;
133 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
134 fw_reg = MCS5080_TOUCHKEY_FW;
135 }
136
137 fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
138 if (fw_ver < 0) {
139 error = fw_ver;
140 dev_err(&client->dev, "i2c read error[%d]\n", error);
141 goto err_free_mem;
142 }
143 dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
144
145 input_dev->name = "MELFAS MCS Touchkey";
146 input_dev->id.bustype = BUS_I2C;
147 input_dev->dev.parent = &client->dev;
148 input_dev->evbit[0] = BIT_MASK(EV_KEY);
149 if (!pdata->no_autorepeat)
150 input_dev->evbit[0] |= BIT_MASK(EV_REP);
151 input_dev->keycode = data->keycodes;
152 input_dev->keycodesize = sizeof(data->keycodes[0]);
153 input_dev->keycodemax = pdata->key_maxval + 1;
154
155 for (i = 0; i < pdata->keymap_size; i++) {
156 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
157 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
158
159 data->keycodes[val] = code;
160 __set_bit(code, input_dev->keybit);
161 }
162
163 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
164 input_set_drvdata(input_dev, data);
165
166 if (pdata->cfg_pin)
167 pdata->cfg_pin();
168
169 if (pdata->poweron) {
170 data->poweron = pdata->poweron;
171 data->poweron(true);
172 }
173
174 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
175 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
176 client->dev.driver->name, data);
177 if (error) {
178 dev_err(&client->dev, "Failed to register interrupt\n");
179 goto err_free_mem;
180 }
181
182 error = input_register_device(input_dev);
183 if (error)
184 goto err_free_irq;
185
186 i2c_set_clientdata(client, data);
187 return 0;
188
189err_free_irq:
190 free_irq(client->irq, data);
191err_free_mem:
192 input_free_device(input_dev);
193 kfree(data);
194 return error;
195}
196
197static void mcs_touchkey_remove(struct i2c_client *client)
198{
199 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
200
201 free_irq(client->irq, data);
202 if (data->poweron)
203 data->poweron(false);
204 input_unregister_device(data->input_dev);
205 kfree(data);
206}
207
208static void mcs_touchkey_shutdown(struct i2c_client *client)
209{
210 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
211
212 if (data->poweron)
213 data->poweron(false);
214}
215
216static int mcs_touchkey_suspend(struct device *dev)
217{
218 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
219 struct i2c_client *client = data->client;
220
221 /* Disable the work */
222 disable_irq(client->irq);
223
224 /* Finally turn off the power */
225 if (data->poweron)
226 data->poweron(false);
227
228 return 0;
229}
230
231static int mcs_touchkey_resume(struct device *dev)
232{
233 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
234 struct i2c_client *client = data->client;
235
236 /* Enable the device first */
237 if (data->poweron)
238 data->poweron(true);
239
240 /* Enable irq again */
241 enable_irq(client->irq);
242
243 return 0;
244}
245
246static DEFINE_SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
247 mcs_touchkey_suspend, mcs_touchkey_resume);
248
249static const struct i2c_device_id mcs_touchkey_id[] = {
250 { "mcs5000_touchkey", MCS5000_TOUCHKEY },
251 { "mcs5080_touchkey", MCS5080_TOUCHKEY },
252 { }
253};
254MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
255
256static struct i2c_driver mcs_touchkey_driver = {
257 .driver = {
258 .name = "mcs_touchkey",
259 .pm = pm_sleep_ptr(&mcs_touchkey_pm_ops),
260 },
261 .probe_new = mcs_touchkey_probe,
262 .remove = mcs_touchkey_remove,
263 .shutdown = mcs_touchkey_shutdown,
264 .id_table = mcs_touchkey_id,
265};
266
267module_i2c_driver(mcs_touchkey_driver);
268
269/* Module information */
270MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
271MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
272MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
273MODULE_LICENSE("GPL");
1/*
2 * Touchkey driver for MELFAS MCS5000/5080 controller
3 *
4 * Copyright (C) 2010 Samsung Electronics Co.Ltd
5 * Author: HeungJun Kim <riverful.kim@samsung.com>
6 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/i2c.h>
17#include <linux/i2c/mcs.h>
18#include <linux/interrupt.h>
19#include <linux/input.h>
20#include <linux/irq.h>
21#include <linux/slab.h>
22#include <linux/pm.h>
23
24/* MCS5000 Touchkey */
25#define MCS5000_TOUCHKEY_STATUS 0x04
26#define MCS5000_TOUCHKEY_STATUS_PRESS 7
27#define MCS5000_TOUCHKEY_FW 0x0a
28#define MCS5000_TOUCHKEY_BASE_VAL 0x61
29
30/* MCS5080 Touchkey */
31#define MCS5080_TOUCHKEY_STATUS 0x00
32#define MCS5080_TOUCHKEY_STATUS_PRESS 3
33#define MCS5080_TOUCHKEY_FW 0x01
34#define MCS5080_TOUCHKEY_BASE_VAL 0x1
35
36enum mcs_touchkey_type {
37 MCS5000_TOUCHKEY,
38 MCS5080_TOUCHKEY,
39};
40
41struct mcs_touchkey_chip {
42 unsigned int status_reg;
43 unsigned int pressbit;
44 unsigned int press_invert;
45 unsigned int baseval;
46};
47
48struct mcs_touchkey_data {
49 void (*poweron)(bool);
50
51 struct i2c_client *client;
52 struct input_dev *input_dev;
53 struct mcs_touchkey_chip chip;
54 unsigned int key_code;
55 unsigned int key_val;
56 unsigned short keycodes[];
57};
58
59static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
60{
61 struct mcs_touchkey_data *data = dev_id;
62 struct mcs_touchkey_chip *chip = &data->chip;
63 struct i2c_client *client = data->client;
64 struct input_dev *input = data->input_dev;
65 unsigned int key_val;
66 unsigned int pressed;
67 int val;
68
69 val = i2c_smbus_read_byte_data(client, chip->status_reg);
70 if (val < 0) {
71 dev_err(&client->dev, "i2c read error [%d]\n", val);
72 goto out;
73 }
74
75 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
76 if (chip->press_invert)
77 pressed ^= chip->press_invert;
78
79 /* key_val is 0 when released, so we should use key_val of press. */
80 if (pressed) {
81 key_val = val & (0xff >> (8 - chip->pressbit));
82 if (!key_val)
83 goto out;
84 key_val -= chip->baseval;
85 data->key_code = data->keycodes[key_val];
86 data->key_val = key_val;
87 }
88
89 input_event(input, EV_MSC, MSC_SCAN, data->key_val);
90 input_report_key(input, data->key_code, pressed);
91 input_sync(input);
92
93 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
94 pressed ? "pressed" : "released");
95
96 out:
97 return IRQ_HANDLED;
98}
99
100static int __devinit mcs_touchkey_probe(struct i2c_client *client,
101 const struct i2c_device_id *id)
102{
103 const struct mcs_platform_data *pdata;
104 struct mcs_touchkey_data *data;
105 struct input_dev *input_dev;
106 unsigned int fw_reg;
107 int fw_ver;
108 int error;
109 int i;
110
111 pdata = client->dev.platform_data;
112 if (!pdata) {
113 dev_err(&client->dev, "no platform data defined\n");
114 return -EINVAL;
115 }
116
117 data = kzalloc(sizeof(struct mcs_touchkey_data) +
118 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
119 GFP_KERNEL);
120 input_dev = input_allocate_device();
121 if (!data || !input_dev) {
122 dev_err(&client->dev, "Failed to allocate memory\n");
123 error = -ENOMEM;
124 goto err_free_mem;
125 }
126
127 data->client = client;
128 data->input_dev = input_dev;
129
130 if (id->driver_data == MCS5000_TOUCHKEY) {
131 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
132 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
133 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
134 fw_reg = MCS5000_TOUCHKEY_FW;
135 } else {
136 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
137 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
138 data->chip.press_invert = 1;
139 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
140 fw_reg = MCS5080_TOUCHKEY_FW;
141 }
142
143 fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
144 if (fw_ver < 0) {
145 error = fw_ver;
146 dev_err(&client->dev, "i2c read error[%d]\n", error);
147 goto err_free_mem;
148 }
149 dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
150
151 input_dev->name = "MELPAS MCS Touchkey";
152 input_dev->id.bustype = BUS_I2C;
153 input_dev->dev.parent = &client->dev;
154 input_dev->evbit[0] = BIT_MASK(EV_KEY);
155 if (!pdata->no_autorepeat)
156 input_dev->evbit[0] |= BIT_MASK(EV_REP);
157 input_dev->keycode = data->keycodes;
158 input_dev->keycodesize = sizeof(data->keycodes[0]);
159 input_dev->keycodemax = pdata->key_maxval + 1;
160
161 for (i = 0; i < pdata->keymap_size; i++) {
162 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
163 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
164
165 data->keycodes[val] = code;
166 __set_bit(code, input_dev->keybit);
167 }
168
169 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
170 input_set_drvdata(input_dev, data);
171
172 if (pdata->cfg_pin)
173 pdata->cfg_pin();
174
175 if (pdata->poweron) {
176 data->poweron = pdata->poweron;
177 data->poweron(true);
178 }
179
180 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
181 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
182 client->dev.driver->name, data);
183 if (error) {
184 dev_err(&client->dev, "Failed to register interrupt\n");
185 goto err_free_mem;
186 }
187
188 error = input_register_device(input_dev);
189 if (error)
190 goto err_free_irq;
191
192 i2c_set_clientdata(client, data);
193 return 0;
194
195err_free_irq:
196 free_irq(client->irq, data);
197err_free_mem:
198 input_free_device(input_dev);
199 kfree(data);
200 return error;
201}
202
203static int __devexit mcs_touchkey_remove(struct i2c_client *client)
204{
205 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
206
207 free_irq(client->irq, data);
208 if (data->poweron)
209 data->poweron(false);
210 input_unregister_device(data->input_dev);
211 kfree(data);
212
213 return 0;
214}
215
216static void mcs_touchkey_shutdown(struct i2c_client *client)
217{
218 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
219
220 if (data->poweron)
221 data->poweron(false);
222}
223
224#ifdef CONFIG_PM_SLEEP
225static int mcs_touchkey_suspend(struct device *dev)
226{
227 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
228 struct i2c_client *client = data->client;
229
230 /* Disable the work */
231 disable_irq(client->irq);
232
233 /* Finally turn off the power */
234 if (data->poweron)
235 data->poweron(false);
236
237 return 0;
238}
239
240static int mcs_touchkey_resume(struct device *dev)
241{
242 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
243 struct i2c_client *client = data->client;
244
245 /* Enable the device first */
246 if (data->poweron)
247 data->poweron(true);
248
249 /* Enable irq again */
250 enable_irq(client->irq);
251
252 return 0;
253}
254#endif
255
256static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
257 mcs_touchkey_suspend, mcs_touchkey_resume);
258
259static const struct i2c_device_id mcs_touchkey_id[] = {
260 { "mcs5000_touchkey", MCS5000_TOUCHKEY },
261 { "mcs5080_touchkey", MCS5080_TOUCHKEY },
262 { }
263};
264MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
265
266static struct i2c_driver mcs_touchkey_driver = {
267 .driver = {
268 .name = "mcs_touchkey",
269 .owner = THIS_MODULE,
270 .pm = &mcs_touchkey_pm_ops,
271 },
272 .probe = mcs_touchkey_probe,
273 .remove = __devexit_p(mcs_touchkey_remove),
274 .shutdown = mcs_touchkey_shutdown,
275 .id_table = mcs_touchkey_id,
276};
277
278module_i2c_driver(mcs_touchkey_driver);
279
280/* Module information */
281MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
282MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
283MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
284MODULE_LICENSE("GPL");