1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/input.h>
18#include <linux/i2c.h>
19#include <linux/slab.h>
20#include <linux/delay.h>
21#include <linux/bitops.h>
22#include <linux/interrupt.h>
23#include <linux/i2c/mpr121_touchkey.h>
24
25
26#define ELE_TOUCH_STATUS_0_ADDR 0x0
27#define ELE_TOUCH_STATUS_1_ADDR 0X1
28#define MHD_RISING_ADDR 0x2b
29#define NHD_RISING_ADDR 0x2c
30#define NCL_RISING_ADDR 0x2d
31#define FDL_RISING_ADDR 0x2e
32#define MHD_FALLING_ADDR 0x2f
33#define NHD_FALLING_ADDR 0x30
34#define NCL_FALLING_ADDR 0x31
35#define FDL_FALLING_ADDR 0x32
36#define ELE0_TOUCH_THRESHOLD_ADDR 0x41
37#define ELE0_RELEASE_THRESHOLD_ADDR 0x42
38#define AFE_CONF_ADDR 0x5c
39#define FILTER_CONF_ADDR 0x5d
40
41
42
43
44
45#define ELECTRODE_CONF_ADDR 0x5e
46#define AUTO_CONFIG_CTRL_ADDR 0x7b
47#define AUTO_CONFIG_USL_ADDR 0x7d
48#define AUTO_CONFIG_LSL_ADDR 0x7e
49#define AUTO_CONFIG_TL_ADDR 0x7f
50
51
52#define TOUCH_THRESHOLD 0x0f
53#define RELEASE_THRESHOLD 0x0a
54
55#define TOUCH_STATUS_MASK 0xfff
56
57#define MPR121_MAX_KEY_COUNT 12
58
59struct mpr121_touchkey {
60 struct i2c_client *client;
61 struct input_dev *input_dev;
62 unsigned int key_val;
63 unsigned int statusbits;
64 unsigned int keycount;
65 u16 keycodes[MPR121_MAX_KEY_COUNT];
66};
67
68struct mpr121_init_register {
69 int addr;
70 u8 val;
71};
72
73static const struct mpr121_init_register init_reg_table[] __devinitconst = {
74 { MHD_RISING_ADDR, 0x1 },
75 { NHD_RISING_ADDR, 0x1 },
76 { MHD_FALLING_ADDR, 0x1 },
77 { NHD_FALLING_ADDR, 0x1 },
78 { NCL_FALLING_ADDR, 0xff },
79 { FDL_FALLING_ADDR, 0x02 },
80 { FILTER_CONF_ADDR, 0x04 },
81 { AFE_CONF_ADDR, 0x0b },
82 { AUTO_CONFIG_CTRL_ADDR, 0x0b },
83};
84
85static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id)
86{
87 struct mpr121_touchkey *mpr121 = dev_id;
88 struct i2c_client *client = mpr121->client;
89 struct input_dev *input = mpr121->input_dev;
90 unsigned int key_num, key_val, pressed;
91 int reg;
92
93 reg = i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_1_ADDR);
94 if (reg < 0) {
95 dev_err(&client->dev, "i2c read error [%d]\n", reg);
96 goto out;
97 }
98
99 reg <<= 8;
100 reg |= i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_0_ADDR);
101 if (reg < 0) {
102 dev_err(&client->dev, "i2c read error [%d]\n", reg);
103 goto out;
104 }
105
106 reg &= TOUCH_STATUS_MASK;
107
108 key_num = ffs(reg ^ mpr121->statusbits) - 1;
109 pressed = reg & (1 << key_num);
110 mpr121->statusbits = reg;
111
112 key_val = mpr121->keycodes[key_num];
113
114 input_event(input, EV_MSC, MSC_SCAN, key_num);
115 input_report_key(input, key_val, pressed);
116 input_sync(input);
117
118 dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val,
119 pressed ? "pressed" : "released");
120
121out:
122 return IRQ_HANDLED;
123}
124
125static int __devinit mpr121_phys_init(const struct mpr121_platform_data *pdata,
126 struct mpr121_touchkey *mpr121,
127 struct i2c_client *client)
128{
129 const struct mpr121_init_register *reg;
130 unsigned char usl, lsl, tl;
131 int i, t, vdd, ret;
132
133
134 for (i = 0; i <= MPR121_MAX_KEY_COUNT; i++) {
135 t = ELE0_TOUCH_THRESHOLD_ADDR + (i * 2);
136 ret = i2c_smbus_write_byte_data(client, t, TOUCH_THRESHOLD);
137 if (ret < 0)
138 goto err_i2c_write;
139 ret = i2c_smbus_write_byte_data(client, t + 1,
140 RELEASE_THRESHOLD);
141 if (ret < 0)
142 goto err_i2c_write;
143 }
144
145
146 for (i = 0; i < ARRAY_SIZE(init_reg_table); i++) {
147 reg = &init_reg_table[i];
148 ret = i2c_smbus_write_byte_data(client, reg->addr, reg->val);
149 if (ret < 0)
150 goto err_i2c_write;
151 }
152
153
154
155
156
157
158
159 vdd = pdata->vdd_uv / 1000;
160 usl = ((vdd - 700) * 256) / vdd;
161 lsl = (usl * 65) / 100;
162 tl = (usl * 90) / 100;
163 ret = i2c_smbus_write_byte_data(client, AUTO_CONFIG_USL_ADDR, usl);
164 ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_LSL_ADDR, lsl);
165 ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_TL_ADDR, tl);
166 ret |= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
167 mpr121->keycount);
168 if (ret != 0)
169 goto err_i2c_write;
170
171 dev_dbg(&client->dev, "set up with %x keys.\n", mpr121->keycount);
172
173 return 0;
174
175err_i2c_write:
176 dev_err(&client->dev, "i2c write error: %d\n", ret);
177 return ret;
178}
179
180static int __devinit mpr_touchkey_probe(struct i2c_client *client,
181 const struct i2c_device_id *id)
182{
183 const struct mpr121_platform_data *pdata = client->dev.platform_data;
184 struct mpr121_touchkey *mpr121;
185 struct input_dev *input_dev;
186 int error;
187 int i;
188
189 if (!pdata) {
190 dev_err(&client->dev, "no platform data defined\n");
191 return -EINVAL;
192 }
193
194 if (!pdata->keymap || !pdata->keymap_size) {
195 dev_err(&client->dev, "missing keymap data\n");
196 return -EINVAL;
197 }
198
199 if (pdata->keymap_size > MPR121_MAX_KEY_COUNT) {
200 dev_err(&client->dev, "too many keys defined\n");
201 return -EINVAL;
202 }
203
204 if (!client->irq) {
205 dev_err(&client->dev, "irq number should not be zero\n");
206 return -EINVAL;
207 }
208
209 mpr121 = kzalloc(sizeof(struct mpr121_touchkey), GFP_KERNEL);
210 input_dev = input_allocate_device();
211 if (!mpr121 || !input_dev) {
212 dev_err(&client->dev, "Failed to allocate memory\n");
213 error = -ENOMEM;
214 goto err_free_mem;
215 }
216
217 mpr121->client = client;
218 mpr121->input_dev = input_dev;
219 mpr121->keycount = pdata->keymap_size;
220
221 input_dev->name = "Freescale MPR121 Touchkey";
222 input_dev->id.bustype = BUS_I2C;
223 input_dev->dev.parent = &client->dev;
224 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
225
226 input_dev->keycode = mpr121->keycodes;
227 input_dev->keycodesize = sizeof(mpr121->keycodes[0]);
228 input_dev->keycodemax = mpr121->keycount;
229
230 for (i = 0; i < pdata->keymap_size; i++) {
231 input_set_capability(input_dev, EV_KEY, pdata->keymap[i]);
232 mpr121->keycodes[i] = pdata->keymap[i];
233 }
234
235 error = mpr121_phys_init(pdata, mpr121, client);
236 if (error) {
237 dev_err(&client->dev, "Failed to init register\n");
238 goto err_free_mem;
239 }
240
241 error = request_threaded_irq(client->irq, NULL,
242 mpr_touchkey_interrupt,
243 IRQF_TRIGGER_FALLING,
244 client->dev.driver->name, mpr121);
245 if (error) {
246 dev_err(&client->dev, "Failed to register interrupt\n");
247 goto err_free_mem;
248 }
249
250 error = input_register_device(input_dev);
251 if (error)
252 goto err_free_irq;
253
254 i2c_set_clientdata(client, mpr121);
255 device_init_wakeup(&client->dev, pdata->wakeup);
256
257 return 0;
258
259err_free_irq:
260 free_irq(client->irq, mpr121);
261err_free_mem:
262 input_free_device(input_dev);
263 kfree(mpr121);
264 return error;
265}
266
267static int __devexit mpr_touchkey_remove(struct i2c_client *client)
268{
269 struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);
270
271 free_irq(client->irq, mpr121);
272 input_unregister_device(mpr121->input_dev);
273 kfree(mpr121);
274
275 return 0;
276}
277
278#ifdef CONFIG_PM_SLEEP
279static int mpr_suspend(struct device *dev)
280{
281 struct i2c_client *client = to_i2c_client(dev);
282
283 if (device_may_wakeup(&client->dev))
284 enable_irq_wake(client->irq);
285
286 i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, 0x00);
287
288 return 0;
289}
290
291static int mpr_resume(struct device *dev)
292{
293 struct i2c_client *client = to_i2c_client(dev);
294 struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);
295
296 if (device_may_wakeup(&client->dev))
297 disable_irq_wake(client->irq);
298
299 i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
300 mpr121->keycount);
301
302 return 0;
303}
304#endif
305
306static SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume);
307
308static const struct i2c_device_id mpr121_id[] = {
309 { "mpr121_touchkey", 0 },
310 { }
311};
312MODULE_DEVICE_TABLE(i2c, mpr121_id);
313
314static struct i2c_driver mpr_touchkey_driver = {
315 .driver = {
316 .name = "mpr121",
317 .owner = THIS_MODULE,
318 .pm = &mpr121_touchkey_pm_ops,
319 },
320 .id_table = mpr121_id,
321 .probe = mpr_touchkey_probe,
322 .remove = __devexit_p(mpr_touchkey_remove),
323};
324
325static int __init mpr_touchkey_init(void)
326{
327 return i2c_add_driver(&mpr_touchkey_driver);
328}
329module_init(mpr_touchkey_init);
330
331static void __exit mpr_touchkey_exit(void)
332{
333 i2c_del_driver(&mpr_touchkey_driver);
334}
335module_exit(mpr_touchkey_exit);
336
337MODULE_LICENSE("GPL");
338MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>");
339MODULE_DESCRIPTION("Touch Key driver for Freescale MPR121 Chip");
340
