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1 | /* |
2 | * Touchkey driver for Freescale MPR121 Controllor |
3 | * |
4 | * Copyright (C) 2011 Freescale Semiconductor, Inc. |
5 | * Author: Zhang Jiejing <jiejing.zhang@freescale.com> |
6 | * |
7 | * Based on mcs_touchkey.c |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License version 2 as |
11 | * published by the Free Software Foundation. |
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 | /* Register definitions */ |
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 | * ELECTRODE_CONF_ADDR: This register configures the number of |
43 | * enabled capacitance sensing inputs and its run/suspend mode. |
44 | */ |
45 | #define ELECTRODE_CONF_ADDR 0x5e |
46 | #define ELECTRODE_CONF_QUICK_CHARGE 0x80 |
47 | #define AUTO_CONFIG_CTRL_ADDR 0x7b |
48 | #define AUTO_CONFIG_USL_ADDR 0x7d |
49 | #define AUTO_CONFIG_LSL_ADDR 0x7e |
50 | #define AUTO_CONFIG_TL_ADDR 0x7f |
51 | |
52 | /* Threshold of touch/release trigger */ |
53 | #define TOUCH_THRESHOLD 0x08 |
54 | #define RELEASE_THRESHOLD 0x05 |
55 | /* Masks for touch and release triggers */ |
56 | #define TOUCH_STATUS_MASK 0xfff |
57 | /* MPR121 has 12 keys */ |
58 | #define MPR121_MAX_KEY_COUNT 12 |
59 | |
60 | struct mpr121_touchkey { |
61 | struct i2c_client *client; |
62 | struct input_dev *input_dev; |
63 | unsigned int key_val; |
64 | unsigned int statusbits; |
65 | unsigned int keycount; |
66 | u16 keycodes[MPR121_MAX_KEY_COUNT]; |
67 | }; |
68 | |
69 | struct mpr121_init_register { |
70 | int addr; |
71 | u8 val; |
72 | }; |
73 | |
74 | static const struct mpr121_init_register init_reg_table[] = { |
75 | { MHD_RISING_ADDR, 0x1 }, |
76 | { NHD_RISING_ADDR, 0x1 }, |
77 | { MHD_FALLING_ADDR, 0x1 }, |
78 | { NHD_FALLING_ADDR, 0x1 }, |
79 | { NCL_FALLING_ADDR, 0xff }, |
80 | { FDL_FALLING_ADDR, 0x02 }, |
81 | { FILTER_CONF_ADDR, 0x04 }, |
82 | { AFE_CONF_ADDR, 0x0b }, |
83 | { AUTO_CONFIG_CTRL_ADDR, 0x0b }, |
84 | }; |
85 | |
86 | static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id) |
87 | { |
88 | struct mpr121_touchkey *mpr121 = dev_id; |
89 | struct i2c_client *client = mpr121->client; |
90 | struct input_dev *input = mpr121->input_dev; |
91 | unsigned int key_num, key_val, pressed; |
92 | int reg; |
93 | |
94 | reg = i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_1_ADDR); |
95 | if (reg < 0) { |
96 | dev_err(&client->dev, "i2c read error [%d]\n", reg); |
97 | goto out; |
98 | } |
99 | |
100 | reg <<= 8; |
101 | reg |= i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_0_ADDR); |
102 | if (reg < 0) { |
103 | dev_err(&client->dev, "i2c read error [%d]\n", reg); |
104 | goto out; |
105 | } |
106 | |
107 | reg &= TOUCH_STATUS_MASK; |
108 | /* use old press bit to figure out which bit changed */ |
109 | key_num = ffs(reg ^ mpr121->statusbits) - 1; |
110 | pressed = reg & (1 << key_num); |
111 | mpr121->statusbits = reg; |
112 | |
113 | key_val = mpr121->keycodes[key_num]; |
114 | |
115 | input_event(input, EV_MSC, MSC_SCAN, key_num); |
116 | input_report_key(input, key_val, pressed); |
117 | input_sync(input); |
118 | |
119 | dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val, |
120 | pressed ? "pressed" : "released"); |
121 | |
122 | out: |
123 | return IRQ_HANDLED; |
124 | } |
125 | |
126 | static int mpr121_phys_init(const struct mpr121_platform_data *pdata, |
127 | struct mpr121_touchkey *mpr121, |
128 | struct i2c_client *client) |
129 | { |
130 | const struct mpr121_init_register *reg; |
131 | unsigned char usl, lsl, tl, eleconf; |
132 | int i, t, vdd, ret; |
133 | |
134 | /* Set up touch/release threshold for ele0-ele11 */ |
135 | for (i = 0; i <= MPR121_MAX_KEY_COUNT; i++) { |
136 | t = ELE0_TOUCH_THRESHOLD_ADDR + (i * 2); |
137 | ret = i2c_smbus_write_byte_data(client, t, TOUCH_THRESHOLD); |
138 | if (ret < 0) |
139 | goto err_i2c_write; |
140 | ret = i2c_smbus_write_byte_data(client, t + 1, |
141 | RELEASE_THRESHOLD); |
142 | if (ret < 0) |
143 | goto err_i2c_write; |
144 | } |
145 | |
146 | /* Set up init register */ |
147 | for (i = 0; i < ARRAY_SIZE(init_reg_table); i++) { |
148 | reg = &init_reg_table[i]; |
149 | ret = i2c_smbus_write_byte_data(client, reg->addr, reg->val); |
150 | if (ret < 0) |
151 | goto err_i2c_write; |
152 | } |
153 | |
154 | |
155 | /* |
156 | * Capacitance on sensing input varies and needs to be compensated. |
157 | * The internal MPR121-auto-configuration can do this if it's |
158 | * registers are set properly (based on pdata->vdd_uv). |
159 | */ |
160 | vdd = pdata->vdd_uv / 1000; |
161 | usl = ((vdd - 700) * 256) / vdd; |
162 | lsl = (usl * 65) / 100; |
163 | tl = (usl * 90) / 100; |
164 | ret = i2c_smbus_write_byte_data(client, AUTO_CONFIG_USL_ADDR, usl); |
165 | ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_LSL_ADDR, lsl); |
166 | ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_TL_ADDR, tl); |
167 | |
168 | /* |
169 | * Quick charge bit will let the capacitive charge to ready |
170 | * state quickly, or the buttons may not function after system |
171 | * boot. |
172 | */ |
173 | eleconf = mpr121->keycount | ELECTRODE_CONF_QUICK_CHARGE; |
174 | ret |= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, |
175 | eleconf); |
176 | if (ret != 0) |
177 | goto err_i2c_write; |
178 | |
179 | dev_dbg(&client->dev, "set up with %x keys.\n", mpr121->keycount); |
180 | |
181 | return 0; |
182 | |
183 | err_i2c_write: |
184 | dev_err(&client->dev, "i2c write error: %d\n", ret); |
185 | return ret; |
186 | } |
187 | |
188 | static int mpr_touchkey_probe(struct i2c_client *client, |
189 | const struct i2c_device_id *id) |
190 | { |
191 | const struct mpr121_platform_data *pdata = client->dev.platform_data; |
192 | struct mpr121_touchkey *mpr121; |
193 | struct input_dev *input_dev; |
194 | int error; |
195 | int i; |
196 | |
197 | if (!pdata) { |
198 | dev_err(&client->dev, "no platform data defined\n"); |
199 | return -EINVAL; |
200 | } |
201 | |
202 | if (!pdata->keymap || !pdata->keymap_size) { |
203 | dev_err(&client->dev, "missing keymap data\n"); |
204 | return -EINVAL; |
205 | } |
206 | |
207 | if (pdata->keymap_size > MPR121_MAX_KEY_COUNT) { |
208 | dev_err(&client->dev, "too many keys defined\n"); |
209 | return -EINVAL; |
210 | } |
211 | |
212 | if (!client->irq) { |
213 | dev_err(&client->dev, "irq number should not be zero\n"); |
214 | return -EINVAL; |
215 | } |
216 | |
217 | mpr121 = kzalloc(sizeof(struct mpr121_touchkey), GFP_KERNEL); |
218 | input_dev = input_allocate_device(); |
219 | if (!mpr121 || !input_dev) { |
220 | dev_err(&client->dev, "Failed to allocate memory\n"); |
221 | error = -ENOMEM; |
222 | goto err_free_mem; |
223 | } |
224 | |
225 | mpr121->client = client; |
226 | mpr121->input_dev = input_dev; |
227 | mpr121->keycount = pdata->keymap_size; |
228 | |
229 | input_dev->name = "Freescale MPR121 Touchkey"; |
230 | input_dev->id.bustype = BUS_I2C; |
231 | input_dev->dev.parent = &client->dev; |
232 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); |
233 | |
234 | input_dev->keycode = mpr121->keycodes; |
235 | input_dev->keycodesize = sizeof(mpr121->keycodes[0]); |
236 | input_dev->keycodemax = mpr121->keycount; |
237 | |
238 | for (i = 0; i < pdata->keymap_size; i++) { |
239 | input_set_capability(input_dev, EV_KEY, pdata->keymap[i]); |
240 | mpr121->keycodes[i] = pdata->keymap[i]; |
241 | } |
242 | |
243 | error = mpr121_phys_init(pdata, mpr121, client); |
244 | if (error) { |
245 | dev_err(&client->dev, "Failed to init register\n"); |
246 | goto err_free_mem; |
247 | } |
248 | |
249 | error = request_threaded_irq(client->irq, NULL, |
250 | mpr_touchkey_interrupt, |
251 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
252 | client->dev.driver->name, mpr121); |
253 | if (error) { |
254 | dev_err(&client->dev, "Failed to register interrupt\n"); |
255 | goto err_free_mem; |
256 | } |
257 | |
258 | error = input_register_device(input_dev); |
259 | if (error) |
260 | goto err_free_irq; |
261 | |
262 | i2c_set_clientdata(client, mpr121); |
263 | device_init_wakeup(&client->dev, pdata->wakeup); |
264 | |
265 | return 0; |
266 | |
267 | err_free_irq: |
268 | free_irq(client->irq, mpr121); |
269 | err_free_mem: |
270 | input_free_device(input_dev); |
271 | kfree(mpr121); |
272 | return error; |
273 | } |
274 | |
275 | static int mpr_touchkey_remove(struct i2c_client *client) |
276 | { |
277 | struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client); |
278 | |
279 | free_irq(client->irq, mpr121); |
280 | input_unregister_device(mpr121->input_dev); |
281 | kfree(mpr121); |
282 | |
283 | return 0; |
284 | } |
285 | |
286 | #ifdef CONFIG_PM_SLEEP |
287 | static int mpr_suspend(struct device *dev) |
288 | { |
289 | struct i2c_client *client = to_i2c_client(dev); |
290 | |
291 | if (device_may_wakeup(&client->dev)) |
292 | enable_irq_wake(client->irq); |
293 | |
294 | i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, 0x00); |
295 | |
296 | return 0; |
297 | } |
298 | |
299 | static int mpr_resume(struct device *dev) |
300 | { |
301 | struct i2c_client *client = to_i2c_client(dev); |
302 | struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client); |
303 | |
304 | if (device_may_wakeup(&client->dev)) |
305 | disable_irq_wake(client->irq); |
306 | |
307 | i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, |
308 | mpr121->keycount); |
309 | |
310 | return 0; |
311 | } |
312 | #endif |
313 | |
314 | static SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume); |
315 | |
316 | static const struct i2c_device_id mpr121_id[] = { |
317 | { "mpr121_touchkey", 0 }, |
318 | { } |
319 | }; |
320 | MODULE_DEVICE_TABLE(i2c, mpr121_id); |
321 | |
322 | static struct i2c_driver mpr_touchkey_driver = { |
323 | .driver = { |
324 | .name = "mpr121", |
325 | .owner = THIS_MODULE, |
326 | .pm = &mpr121_touchkey_pm_ops, |
327 | }, |
328 | .id_table = mpr121_id, |
329 | .probe = mpr_touchkey_probe, |
330 | .remove = mpr_touchkey_remove, |
331 | }; |
332 | |
333 | module_i2c_driver(mpr_touchkey_driver); |
334 | |
335 | MODULE_LICENSE("GPL"); |
336 | MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>"); |
337 | MODULE_DESCRIPTION("Touch Key driver for Freescale MPR121 Chip"); |
338 |
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