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36682b81 ZJ |
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 | ||
36682b81 | 15 | #include <linux/bitops.h> |
de901cc3 AM |
16 | #include <linux/delay.h> |
17 | #include <linux/i2c.h> | |
18 | #include <linux/input.h> | |
36682b81 | 19 | #include <linux/interrupt.h> |
de901cc3 AM |
20 | #include <linux/module.h> |
21 | #include <linux/of.h> | |
22 | #include <linux/property.h> | |
23 | #include <linux/regulator/consumer.h> | |
24 | #include <linux/slab.h> | |
36682b81 ZJ |
25 | |
26 | /* Register definitions */ | |
27 | #define ELE_TOUCH_STATUS_0_ADDR 0x0 | |
28 | #define ELE_TOUCH_STATUS_1_ADDR 0X1 | |
29 | #define MHD_RISING_ADDR 0x2b | |
30 | #define NHD_RISING_ADDR 0x2c | |
31 | #define NCL_RISING_ADDR 0x2d | |
32 | #define FDL_RISING_ADDR 0x2e | |
33 | #define MHD_FALLING_ADDR 0x2f | |
34 | #define NHD_FALLING_ADDR 0x30 | |
35 | #define NCL_FALLING_ADDR 0x31 | |
36 | #define FDL_FALLING_ADDR 0x32 | |
37 | #define ELE0_TOUCH_THRESHOLD_ADDR 0x41 | |
38 | #define ELE0_RELEASE_THRESHOLD_ADDR 0x42 | |
39 | #define AFE_CONF_ADDR 0x5c | |
40 | #define FILTER_CONF_ADDR 0x5d | |
41 | ||
42 | /* | |
43 | * ELECTRODE_CONF_ADDR: This register configures the number of | |
44 | * enabled capacitance sensing inputs and its run/suspend mode. | |
45 | */ | |
46 | #define ELECTRODE_CONF_ADDR 0x5e | |
c7b4a5d5 | 47 | #define ELECTRODE_CONF_QUICK_CHARGE 0x80 |
36682b81 ZJ |
48 | #define AUTO_CONFIG_CTRL_ADDR 0x7b |
49 | #define AUTO_CONFIG_USL_ADDR 0x7d | |
50 | #define AUTO_CONFIG_LSL_ADDR 0x7e | |
51 | #define AUTO_CONFIG_TL_ADDR 0x7f | |
52 | ||
53 | /* Threshold of touch/release trigger */ | |
c7b4a5d5 JZ |
54 | #define TOUCH_THRESHOLD 0x08 |
55 | #define RELEASE_THRESHOLD 0x05 | |
36682b81 ZJ |
56 | /* Masks for touch and release triggers */ |
57 | #define TOUCH_STATUS_MASK 0xfff | |
58 | /* MPR121 has 12 keys */ | |
59 | #define MPR121_MAX_KEY_COUNT 12 | |
60 | ||
61 | struct mpr121_touchkey { | |
62 | struct i2c_client *client; | |
63 | struct input_dev *input_dev; | |
36682b81 ZJ |
64 | unsigned int statusbits; |
65 | unsigned int keycount; | |
de901cc3 | 66 | u32 keycodes[MPR121_MAX_KEY_COUNT]; |
36682b81 ZJ |
67 | }; |
68 | ||
69 | struct mpr121_init_register { | |
70 | int addr; | |
71 | u8 val; | |
72 | }; | |
73 | ||
78f50c24 | 74 | static const struct mpr121_init_register init_reg_table[] = { |
36682b81 ZJ |
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 | ||
de901cc3 AM |
86 | static void mpr121_vdd_supply_disable(void *data) |
87 | { | |
88 | struct regulator *vdd_supply = data; | |
89 | ||
90 | regulator_disable(vdd_supply); | |
91 | } | |
92 | ||
93 | static struct regulator *mpr121_vdd_supply_init(struct device *dev) | |
94 | { | |
95 | struct regulator *vdd_supply; | |
96 | int err; | |
97 | ||
98 | vdd_supply = devm_regulator_get(dev, "vdd"); | |
99 | if (IS_ERR(vdd_supply)) { | |
100 | dev_err(dev, "failed to get vdd regulator: %ld\n", | |
101 | PTR_ERR(vdd_supply)); | |
102 | return vdd_supply; | |
103 | } | |
104 | ||
105 | err = regulator_enable(vdd_supply); | |
106 | if (err) { | |
107 | dev_err(dev, "failed to enable vdd regulator: %d\n", err); | |
108 | return ERR_PTR(err); | |
109 | } | |
110 | ||
111 | err = devm_add_action(dev, mpr121_vdd_supply_disable, vdd_supply); | |
112 | if (err) { | |
113 | regulator_disable(vdd_supply); | |
114 | dev_err(dev, "failed to add disable regulator action: %d\n", | |
115 | err); | |
116 | return ERR_PTR(err); | |
117 | } | |
118 | ||
119 | return vdd_supply; | |
120 | } | |
121 | ||
36682b81 ZJ |
122 | static irqreturn_t mpr_touchkey_interrupt(int irq, void *dev_id) |
123 | { | |
124 | struct mpr121_touchkey *mpr121 = dev_id; | |
125 | struct i2c_client *client = mpr121->client; | |
126 | struct input_dev *input = mpr121->input_dev; | |
08fea55e AM |
127 | unsigned long bit_changed; |
128 | unsigned int key_num; | |
36682b81 ZJ |
129 | int reg; |
130 | ||
131 | reg = i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_1_ADDR); | |
132 | if (reg < 0) { | |
133 | dev_err(&client->dev, "i2c read error [%d]\n", reg); | |
134 | goto out; | |
135 | } | |
136 | ||
137 | reg <<= 8; | |
138 | reg |= i2c_smbus_read_byte_data(client, ELE_TOUCH_STATUS_0_ADDR); | |
139 | if (reg < 0) { | |
140 | dev_err(&client->dev, "i2c read error [%d]\n", reg); | |
141 | goto out; | |
142 | } | |
143 | ||
144 | reg &= TOUCH_STATUS_MASK; | |
145 | /* use old press bit to figure out which bit changed */ | |
08fea55e | 146 | bit_changed = reg ^ mpr121->statusbits; |
36682b81 | 147 | mpr121->statusbits = reg; |
08fea55e AM |
148 | for_each_set_bit(key_num, &bit_changed, mpr121->keycount) { |
149 | unsigned int key_val, pressed; | |
36682b81 | 150 | |
08fea55e AM |
151 | pressed = reg & BIT(key_num); |
152 | key_val = mpr121->keycodes[key_num]; | |
36682b81 | 153 | |
08fea55e AM |
154 | input_event(input, EV_MSC, MSC_SCAN, key_num); |
155 | input_report_key(input, key_val, pressed); | |
156 | ||
157 | dev_dbg(&client->dev, "key %d %d %s\n", key_num, key_val, | |
158 | pressed ? "pressed" : "released"); | |
36682b81 | 159 | |
08fea55e AM |
160 | } |
161 | input_sync(input); | |
36682b81 ZJ |
162 | |
163 | out: | |
164 | return IRQ_HANDLED; | |
165 | } | |
166 | ||
de901cc3 AM |
167 | static int mpr121_phys_init(struct mpr121_touchkey *mpr121, |
168 | struct i2c_client *client, int vdd_uv) | |
36682b81 ZJ |
169 | { |
170 | const struct mpr121_init_register *reg; | |
c7b4a5d5 | 171 | unsigned char usl, lsl, tl, eleconf; |
36682b81 ZJ |
172 | int i, t, vdd, ret; |
173 | ||
174 | /* Set up touch/release threshold for ele0-ele11 */ | |
175 | for (i = 0; i <= MPR121_MAX_KEY_COUNT; i++) { | |
176 | t = ELE0_TOUCH_THRESHOLD_ADDR + (i * 2); | |
177 | ret = i2c_smbus_write_byte_data(client, t, TOUCH_THRESHOLD); | |
178 | if (ret < 0) | |
179 | goto err_i2c_write; | |
180 | ret = i2c_smbus_write_byte_data(client, t + 1, | |
181 | RELEASE_THRESHOLD); | |
182 | if (ret < 0) | |
183 | goto err_i2c_write; | |
184 | } | |
185 | ||
186 | /* Set up init register */ | |
187 | for (i = 0; i < ARRAY_SIZE(init_reg_table); i++) { | |
188 | reg = &init_reg_table[i]; | |
189 | ret = i2c_smbus_write_byte_data(client, reg->addr, reg->val); | |
190 | if (ret < 0) | |
191 | goto err_i2c_write; | |
192 | } | |
193 | ||
194 | ||
195 | /* | |
196 | * Capacitance on sensing input varies and needs to be compensated. | |
197 | * The internal MPR121-auto-configuration can do this if it's | |
de901cc3 | 198 | * registers are set properly (based on vdd_uv). |
36682b81 | 199 | */ |
de901cc3 | 200 | vdd = vdd_uv / 1000; |
36682b81 ZJ |
201 | usl = ((vdd - 700) * 256) / vdd; |
202 | lsl = (usl * 65) / 100; | |
203 | tl = (usl * 90) / 100; | |
204 | ret = i2c_smbus_write_byte_data(client, AUTO_CONFIG_USL_ADDR, usl); | |
205 | ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_LSL_ADDR, lsl); | |
206 | ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_TL_ADDR, tl); | |
c7b4a5d5 JZ |
207 | |
208 | /* | |
209 | * Quick charge bit will let the capacitive charge to ready | |
210 | * state quickly, or the buttons may not function after system | |
211 | * boot. | |
212 | */ | |
213 | eleconf = mpr121->keycount | ELECTRODE_CONF_QUICK_CHARGE; | |
36682b81 | 214 | ret |= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, |
c7b4a5d5 | 215 | eleconf); |
36682b81 ZJ |
216 | if (ret != 0) |
217 | goto err_i2c_write; | |
218 | ||
219 | dev_dbg(&client->dev, "set up with %x keys.\n", mpr121->keycount); | |
220 | ||
221 | return 0; | |
222 | ||
223 | err_i2c_write: | |
224 | dev_err(&client->dev, "i2c write error: %d\n", ret); | |
225 | return ret; | |
226 | } | |
227 | ||
5298cc4c BP |
228 | static int mpr_touchkey_probe(struct i2c_client *client, |
229 | const struct i2c_device_id *id) | |
36682b81 | 230 | { |
de901cc3 AM |
231 | struct device *dev = &client->dev; |
232 | struct regulator *vdd_supply; | |
233 | int vdd_uv; | |
36682b81 ZJ |
234 | struct mpr121_touchkey *mpr121; |
235 | struct input_dev *input_dev; | |
236 | int error; | |
237 | int i; | |
238 | ||
36682b81 | 239 | if (!client->irq) { |
b4e66e7d | 240 | dev_err(dev, "irq number should not be zero\n"); |
36682b81 ZJ |
241 | return -EINVAL; |
242 | } | |
243 | ||
de901cc3 AM |
244 | vdd_supply = mpr121_vdd_supply_init(dev); |
245 | if (IS_ERR(vdd_supply)) | |
246 | return PTR_ERR(vdd_supply); | |
247 | ||
248 | vdd_uv = regulator_get_voltage(vdd_supply); | |
249 | ||
b4e66e7d | 250 | mpr121 = devm_kzalloc(dev, sizeof(*mpr121), GFP_KERNEL); |
254af0a3 PG |
251 | if (!mpr121) |
252 | return -ENOMEM; | |
253 | ||
b4e66e7d | 254 | input_dev = devm_input_allocate_device(dev); |
254af0a3 PG |
255 | if (!input_dev) |
256 | return -ENOMEM; | |
36682b81 ZJ |
257 | |
258 | mpr121->client = client; | |
259 | mpr121->input_dev = input_dev; | |
de901cc3 AM |
260 | mpr121->keycount = device_property_read_u32_array(dev, "linux,keycodes", |
261 | NULL, 0); | |
262 | if (mpr121->keycount > MPR121_MAX_KEY_COUNT) { | |
263 | dev_err(dev, "too many keys defined (%d)\n", mpr121->keycount); | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
267 | error = device_property_read_u32_array(dev, "linux,keycodes", | |
268 | mpr121->keycodes, | |
269 | mpr121->keycount); | |
270 | if (error) { | |
271 | dev_err(dev, | |
272 | "failed to read linux,keycode property: %d\n", error); | |
273 | return error; | |
274 | } | |
36682b81 ZJ |
275 | |
276 | input_dev->name = "Freescale MPR121 Touchkey"; | |
277 | input_dev->id.bustype = BUS_I2C; | |
b4e66e7d | 278 | input_dev->dev.parent = dev; |
de901cc3 AM |
279 | if (device_property_read_bool(dev, "autorepeat")) |
280 | __set_bit(EV_REP, input_dev->evbit); | |
9723ddc8 | 281 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
36682b81 ZJ |
282 | |
283 | input_dev->keycode = mpr121->keycodes; | |
284 | input_dev->keycodesize = sizeof(mpr121->keycodes[0]); | |
285 | input_dev->keycodemax = mpr121->keycount; | |
286 | ||
de901cc3 AM |
287 | for (i = 0; i < mpr121->keycount; i++) |
288 | input_set_capability(input_dev, EV_KEY, mpr121->keycodes[i]); | |
36682b81 | 289 | |
de901cc3 | 290 | error = mpr121_phys_init(mpr121, client, vdd_uv); |
36682b81 | 291 | if (error) { |
b4e66e7d | 292 | dev_err(dev, "Failed to init register\n"); |
254af0a3 | 293 | return error; |
36682b81 ZJ |
294 | } |
295 | ||
b4e66e7d GR |
296 | error = devm_request_threaded_irq(dev, client->irq, NULL, |
297 | mpr_touchkey_interrupt, | |
de901cc3 | 298 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
b4e66e7d | 299 | dev->driver->name, mpr121); |
36682b81 | 300 | if (error) { |
b4e66e7d | 301 | dev_err(dev, "Failed to register interrupt\n"); |
254af0a3 | 302 | return error; |
36682b81 ZJ |
303 | } |
304 | ||
305 | error = input_register_device(input_dev); | |
306 | if (error) | |
254af0a3 | 307 | return error; |
36682b81 ZJ |
308 | |
309 | i2c_set_clientdata(client, mpr121); | |
de901cc3 AM |
310 | device_init_wakeup(dev, |
311 | device_property_read_bool(dev, "wakeup-source")); | |
36682b81 | 312 | |
36682b81 ZJ |
313 | return 0; |
314 | } | |
315 | ||
890fa167 | 316 | static int __maybe_unused mpr_suspend(struct device *dev) |
36682b81 ZJ |
317 | { |
318 | struct i2c_client *client = to_i2c_client(dev); | |
319 | ||
320 | if (device_may_wakeup(&client->dev)) | |
321 | enable_irq_wake(client->irq); | |
322 | ||
323 | i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, 0x00); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
890fa167 | 328 | static int __maybe_unused mpr_resume(struct device *dev) |
36682b81 ZJ |
329 | { |
330 | struct i2c_client *client = to_i2c_client(dev); | |
331 | struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client); | |
332 | ||
333 | if (device_may_wakeup(&client->dev)) | |
334 | disable_irq_wake(client->irq); | |
335 | ||
336 | i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR, | |
337 | mpr121->keycount); | |
338 | ||
339 | return 0; | |
340 | } | |
36682b81 ZJ |
341 | |
342 | static SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume); | |
343 | ||
344 | static const struct i2c_device_id mpr121_id[] = { | |
345 | { "mpr121_touchkey", 0 }, | |
346 | { } | |
347 | }; | |
348 | MODULE_DEVICE_TABLE(i2c, mpr121_id); | |
349 | ||
de901cc3 AM |
350 | #ifdef CONFIG_OF |
351 | static const struct of_device_id mpr121_touchkey_dt_match_table[] = { | |
352 | { .compatible = "fsl,mpr121-touchkey" }, | |
353 | { }, | |
354 | }; | |
355 | MODULE_DEVICE_TABLE(of, mpr121_touchkey_dt_match_table); | |
356 | #endif | |
357 | ||
36682b81 ZJ |
358 | static struct i2c_driver mpr_touchkey_driver = { |
359 | .driver = { | |
360 | .name = "mpr121", | |
36682b81 | 361 | .pm = &mpr121_touchkey_pm_ops, |
de901cc3 | 362 | .of_match_table = of_match_ptr(mpr121_touchkey_dt_match_table), |
36682b81 ZJ |
363 | }, |
364 | .id_table = mpr121_id, | |
365 | .probe = mpr_touchkey_probe, | |
36682b81 ZJ |
366 | }; |
367 | ||
1b92c1cf | 368 | module_i2c_driver(mpr_touchkey_driver); |
36682b81 ZJ |
369 | |
370 | MODULE_LICENSE("GPL"); | |
371 | MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>"); | |
372 | MODULE_DESCRIPTION("Touch Key driver for Freescale MPR121 Chip"); |