2 * File: drivers/input/keyboard/adp5588_keys.c
3 * Description: keypad driver for ADP5588 and ADP5587
4 * I2C QWERTY Keypad and IO Expander
5 * Bugs: Enter bugs at http://blackfin.uclinux.org/
7 * Copyright (C) 2008-2009 Analog Devices Inc.
8 * Licensed under the GPL-2 or later.
11 #include <linux/module.h>
12 #include <linux/version.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/irq.h>
16 #include <linux/workqueue.h>
17 #include <linux/errno.h>
19 #include <linux/platform_device.h>
20 #include <linux/input.h>
21 #include <linux/i2c.h>
22 #include <linux/slab.h>
24 #include <linux/i2c/adp5588.h>
26 /* Configuration Register1 */
27 #define AUTO_INC (1 << 7)
28 #define GPIEM_CFG (1 << 6)
29 #define OVR_FLOW_M (1 << 5)
30 #define INT_CFG (1 << 4)
31 #define OVR_FLOW_IEN (1 << 3)
32 #define K_LCK_IM (1 << 2)
33 #define GPI_IEN (1 << 1)
34 #define KE_IEN (1 << 0)
36 /* Interrupt Status Register */
37 #define CMP2_INT (1 << 5)
38 #define CMP1_INT (1 << 4)
39 #define OVR_FLOW_INT (1 << 3)
40 #define K_LCK_INT (1 << 2)
41 #define GPI_INT (1 << 1)
42 #define KE_INT (1 << 0)
44 /* Key Lock and Event Counter Register */
45 #define K_LCK_EN (1 << 6)
49 /* Key Event Register xy */
50 #define KEY_EV_PRESSED (1 << 7)
51 #define KEY_EV_MASK (0x7F)
53 #define KP_SEL(x) (0xFFFF >> (16 - x)) /* 2^x-1 */
55 #define KEYP_MAX_EVENT 10
58 * Early pre 4.0 Silicon required to delay readout by at least 25ms,
59 * since the Event Counter Register updated 25ms after the interrupt
62 #define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
65 struct i2c_client *client;
66 struct input_dev *input;
67 struct delayed_work work;
69 unsigned short keycode[ADP5588_KEYMAPSIZE];
72 static int adp5588_read(struct i2c_client *client, u8 reg)
74 int ret = i2c_smbus_read_byte_data(client, reg);
77 dev_err(&client->dev, "Read Error\n");
82 static int adp5588_write(struct i2c_client *client, u8 reg, u8 val)
84 return i2c_smbus_write_byte_data(client, reg, val);
87 static void adp5588_work(struct work_struct *work)
89 struct adp5588_kpad *kpad = container_of(work,
90 struct adp5588_kpad, work.work);
91 struct i2c_client *client = kpad->client;
92 int i, key, status, ev_cnt;
94 status = adp5588_read(client, INT_STAT);
96 if (status & OVR_FLOW_INT) /* Unlikely and should never happen */
97 dev_err(&client->dev, "Event Overflow Error\n");
99 if (status & KE_INT) {
100 ev_cnt = adp5588_read(client, KEY_LCK_EC_STAT) & KEC;
102 for (i = 0; i < ev_cnt; i++) {
103 key = adp5588_read(client, Key_EVENTA + i);
104 input_report_key(kpad->input,
105 kpad->keycode[(key & KEY_EV_MASK) - 1],
106 key & KEY_EV_PRESSED);
108 input_sync(kpad->input);
111 adp5588_write(client, INT_STAT, status); /* Status is W1C */
114 static irqreturn_t adp5588_irq(int irq, void *handle)
116 struct adp5588_kpad *kpad = handle;
119 * use keventd context to read the event fifo registers
120 * Schedule readout at least 25ms after notification for
124 schedule_delayed_work(&kpad->work, kpad->delay);
129 static int __devinit adp5588_setup(struct i2c_client *client)
131 struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
134 ret = adp5588_write(client, KP_GPIO1, KP_SEL(pdata->rows));
135 ret |= adp5588_write(client, KP_GPIO2, KP_SEL(pdata->cols) & 0xFF);
136 ret |= adp5588_write(client, KP_GPIO3, KP_SEL(pdata->cols) >> 8);
138 if (pdata->en_keylock) {
139 ret |= adp5588_write(client, UNLOCK1, pdata->unlock_key1);
140 ret |= adp5588_write(client, UNLOCK2, pdata->unlock_key2);
141 ret |= adp5588_write(client, KEY_LCK_EC_STAT, K_LCK_EN);
144 for (i = 0; i < KEYP_MAX_EVENT; i++)
145 ret |= adp5588_read(client, Key_EVENTA);
147 ret |= adp5588_write(client, INT_STAT, CMP2_INT | CMP1_INT |
148 OVR_FLOW_INT | K_LCK_INT |
149 GPI_INT | KE_INT); /* Status is W1C */
151 ret |= adp5588_write(client, CFG, INT_CFG | OVR_FLOW_IEN | KE_IEN);
154 dev_err(&client->dev, "Write Error\n");
161 static int __devinit adp5588_probe(struct i2c_client *client,
162 const struct i2c_device_id *id)
164 struct adp5588_kpad *kpad;
165 struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
166 struct input_dev *input;
171 if (!i2c_check_functionality(client->adapter,
172 I2C_FUNC_SMBUS_BYTE_DATA)) {
173 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
178 dev_err(&client->dev, "no platform data?\n");
182 if (!pdata->rows || !pdata->cols || !pdata->keymap) {
183 dev_err(&client->dev, "no rows, cols or keymap from pdata\n");
187 if (pdata->keymapsize != ADP5588_KEYMAPSIZE) {
188 dev_err(&client->dev, "invalid keymapsize\n");
193 dev_err(&client->dev, "no IRQ?\n");
197 kpad = kzalloc(sizeof(*kpad), GFP_KERNEL);
198 input = input_allocate_device();
199 if (!kpad || !input) {
204 kpad->client = client;
206 INIT_DELAYED_WORK(&kpad->work, adp5588_work);
208 ret = adp5588_read(client, DEV_ID);
214 revid = (u8) ret & ADP5588_DEVICE_ID_MASK;
215 if (WA_DELAYED_READOUT_REVID(revid))
216 kpad->delay = msecs_to_jiffies(30);
218 input->name = client->name;
219 input->phys = "adp5588-keys/input0";
220 input->dev.parent = &client->dev;
222 input_set_drvdata(input, kpad);
224 input->id.bustype = BUS_I2C;
225 input->id.vendor = 0x0001;
226 input->id.product = 0x0001;
227 input->id.version = revid;
229 input->keycodesize = sizeof(kpad->keycode[0]);
230 input->keycodemax = pdata->keymapsize;
231 input->keycode = kpad->keycode;
233 memcpy(kpad->keycode, pdata->keymap,
234 pdata->keymapsize * input->keycodesize);
236 /* setup input device */
237 __set_bit(EV_KEY, input->evbit);
240 __set_bit(EV_REP, input->evbit);
242 for (i = 0; i < input->keycodemax; i++)
243 __set_bit(kpad->keycode[i] & KEY_MAX, input->keybit);
244 __clear_bit(KEY_RESERVED, input->keybit);
246 error = input_register_device(input);
248 dev_err(&client->dev, "unable to register input device\n");
252 error = request_irq(client->irq, adp5588_irq,
253 IRQF_TRIGGER_FALLING | IRQF_DISABLED,
254 client->dev.driver->name, kpad);
256 dev_err(&client->dev, "irq %d busy?\n", client->irq);
260 error = adp5588_setup(client);
264 device_init_wakeup(&client->dev, 1);
265 i2c_set_clientdata(client, kpad);
267 dev_info(&client->dev, "Rev.%d keypad, irq %d\n", revid, client->irq);
271 free_irq(client->irq, kpad);
273 input_unregister_device(input);
276 input_free_device(input);
282 static int __devexit adp5588_remove(struct i2c_client *client)
284 struct adp5588_kpad *kpad = i2c_get_clientdata(client);
286 adp5588_write(client, CFG, 0);
287 free_irq(client->irq, kpad);
288 cancel_delayed_work_sync(&kpad->work);
289 input_unregister_device(kpad->input);
296 static int adp5588_suspend(struct device *dev)
298 struct adp5588_kpad *kpad = dev_get_drvdata(dev);
299 struct i2c_client *client = kpad->client;
301 disable_irq(client->irq);
302 cancel_delayed_work_sync(&kpad->work);
304 if (device_may_wakeup(&client->dev))
305 enable_irq_wake(client->irq);
310 static int adp5588_resume(struct device *dev)
312 struct adp5588_kpad *kpad = dev_get_drvdata(dev);
313 struct i2c_client *client = kpad->client;
315 if (device_may_wakeup(&client->dev))
316 disable_irq_wake(client->irq);
318 enable_irq(client->irq);
323 static const struct dev_pm_ops adp5588_dev_pm_ops = {
324 .suspend = adp5588_suspend,
325 .resume = adp5588_resume,
329 static const struct i2c_device_id adp5588_id[] = {
330 { KBUILD_MODNAME, 0 },
331 { "adp5587-keys", 0 },
334 MODULE_DEVICE_TABLE(i2c, adp5588_id);
336 static struct i2c_driver adp5588_driver = {
338 .name = KBUILD_MODNAME,
340 .pm = &adp5588_dev_pm_ops,
343 .probe = adp5588_probe,
344 .remove = __devexit_p(adp5588_remove),
345 .id_table = adp5588_id,
348 static int __init adp5588_init(void)
350 return i2c_add_driver(&adp5588_driver);
352 module_init(adp5588_init);
354 static void __exit adp5588_exit(void)
356 i2c_del_driver(&adp5588_driver);
358 module_exit(adp5588_exit);
360 MODULE_LICENSE("GPL");
361 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
362 MODULE_DESCRIPTION("ADP5588/87 Keypad driver");
363 MODULE_ALIAS("platform:adp5588-keys");