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8#include <linux/module.h>
9#include <linux/slab.h>
10#include <linux/input.h>
11#include <linux/interrupt.h>
12#include <linux/platform_device.h>
13#include <linux/input/matrix_keypad.h>
14#include <linux/mfd/stmpe.h>
15
16
17#define STMPE_KPC_COL 0x60
18#define STMPE_KPC_ROW_MSB 0x61
19#define STMPE_KPC_ROW_LSB 0x62
20#define STMPE_KPC_CTRL_MSB 0x63
21#define STMPE_KPC_CTRL_LSB 0x64
22#define STMPE_KPC_COMBI_KEY_0 0x65
23#define STMPE_KPC_COMBI_KEY_1 0x66
24#define STMPE_KPC_COMBI_KEY_2 0x67
25#define STMPE_KPC_DATA_BYTE0 0x68
26#define STMPE_KPC_DATA_BYTE1 0x69
27#define STMPE_KPC_DATA_BYTE2 0x6a
28#define STMPE_KPC_DATA_BYTE3 0x6b
29#define STMPE_KPC_DATA_BYTE4 0x6c
30
31#define STMPE_KPC_CTRL_LSB_SCAN (0x1 << 0)
32#define STMPE_KPC_CTRL_LSB_DEBOUNCE (0x7f << 1)
33#define STMPE_KPC_CTRL_MSB_SCAN_COUNT (0xf << 4)
34
35#define STMPE_KPC_ROW_MSB_ROWS 0xff
36
37#define STMPE_KPC_DATA_UP (0x1 << 7)
38#define STMPE_KPC_DATA_ROW (0xf << 3)
39#define STMPE_KPC_DATA_COL (0x7 << 0)
40#define STMPE_KPC_DATA_NOKEY_MASK 0x78
41
42#define STMPE_KEYPAD_MAX_DEBOUNCE 127
43#define STMPE_KEYPAD_MAX_SCAN_COUNT 15
44
45#define STMPE_KEYPAD_MAX_ROWS 8
46#define STMPE_KEYPAD_MAX_COLS 8
47#define STMPE_KEYPAD_ROW_SHIFT 3
48#define STMPE_KEYPAD_KEYMAP_MAX_SIZE \
49 (STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS)
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63struct stmpe_keypad_variant {
64 bool auto_increment;
65 bool set_pullup;
66 int num_data;
67 int num_normal_data;
68 int max_cols;
69 int max_rows;
70 unsigned int col_gpios;
71 unsigned int row_gpios;
72};
73
74static const struct stmpe_keypad_variant stmpe_keypad_variants[] = {
75 [STMPE1601] = {
76 .auto_increment = true,
77 .num_data = 5,
78 .num_normal_data = 3,
79 .max_cols = 8,
80 .max_rows = 8,
81 .col_gpios = 0x000ff,
82 .row_gpios = 0x0ff00,
83 },
84 [STMPE2401] = {
85 .auto_increment = false,
86 .set_pullup = true,
87 .num_data = 3,
88 .num_normal_data = 2,
89 .max_cols = 8,
90 .max_rows = 12,
91 .col_gpios = 0x0000ff,
92 .row_gpios = 0x1f7f00,
93 },
94 [STMPE2403] = {
95 .auto_increment = true,
96 .set_pullup = true,
97 .num_data = 5,
98 .num_normal_data = 3,
99 .max_cols = 8,
100 .max_rows = 12,
101 .col_gpios = 0x0000ff,
102 .row_gpios = 0x1fef00,
103 },
104};
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119
120struct stmpe_keypad {
121 struct stmpe *stmpe;
122 struct input_dev *input;
123 const struct stmpe_keypad_variant *variant;
124 unsigned int debounce_ms;
125 unsigned int scan_count;
126 bool no_autorepeat;
127 unsigned int rows;
128 unsigned int cols;
129 unsigned short keymap[STMPE_KEYPAD_KEYMAP_MAX_SIZE];
130};
131
132static int stmpe_keypad_read_data(struct stmpe_keypad *keypad, u8 *data)
133{
134 const struct stmpe_keypad_variant *variant = keypad->variant;
135 struct stmpe *stmpe = keypad->stmpe;
136 int ret;
137 int i;
138
139 if (variant->auto_increment)
140 return stmpe_block_read(stmpe, STMPE_KPC_DATA_BYTE0,
141 variant->num_data, data);
142
143 for (i = 0; i < variant->num_data; i++) {
144 ret = stmpe_reg_read(stmpe, STMPE_KPC_DATA_BYTE0 + i);
145 if (ret < 0)
146 return ret;
147
148 data[i] = ret;
149 }
150
151 return 0;
152}
153
154static irqreturn_t stmpe_keypad_irq(int irq, void *dev)
155{
156 struct stmpe_keypad *keypad = dev;
157 struct input_dev *input = keypad->input;
158 const struct stmpe_keypad_variant *variant = keypad->variant;
159 u8 fifo[variant->num_data];
160 int ret;
161 int i;
162
163 ret = stmpe_keypad_read_data(keypad, fifo);
164 if (ret < 0)
165 return IRQ_NONE;
166
167 for (i = 0; i < variant->num_normal_data; i++) {
168 u8 data = fifo[i];
169 int row = (data & STMPE_KPC_DATA_ROW) >> 3;
170 int col = data & STMPE_KPC_DATA_COL;
171 int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT);
172 bool up = data & STMPE_KPC_DATA_UP;
173
174 if ((data & STMPE_KPC_DATA_NOKEY_MASK)
175 == STMPE_KPC_DATA_NOKEY_MASK)
176 continue;
177
178 input_event(input, EV_MSC, MSC_SCAN, code);
179 input_report_key(input, keypad->keymap[code], !up);
180 input_sync(input);
181 }
182
183 return IRQ_HANDLED;
184}
185
186static int stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad)
187{
188 const struct stmpe_keypad_variant *variant = keypad->variant;
189 unsigned int col_gpios = variant->col_gpios;
190 unsigned int row_gpios = variant->row_gpios;
191 struct stmpe *stmpe = keypad->stmpe;
192 u8 pureg = stmpe->regs[STMPE_IDX_GPPUR_LSB];
193 unsigned int pins = 0;
194 unsigned int pu_pins = 0;
195 int ret;
196 int i;
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209 for (i = 0; i < variant->max_cols; i++) {
210 int num = __ffs(col_gpios);
211
212 if (keypad->cols & (1 << i)) {
213 pins |= 1 << num;
214 pu_pins |= 1 << num;
215 }
216
217 col_gpios &= ~(1 << num);
218 }
219
220 for (i = 0; i < variant->max_rows; i++) {
221 int num = __ffs(row_gpios);
222
223 if (keypad->rows & (1 << i))
224 pins |= 1 << num;
225
226 row_gpios &= ~(1 << num);
227 }
228
229 ret = stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
230 if (ret)
231 return ret;
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238
239 if (variant->set_pullup) {
240 u8 val;
241
242 ret = stmpe_reg_read(stmpe, pureg);
243 if (ret)
244 return ret;
245
246
247 val = ret & ~pu_pins;
248 val |= pu_pins;
249
250 ret = stmpe_reg_write(stmpe, pureg, val);
251 }
252
253 return 0;
254}
255
256static int stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
257{
258 const struct stmpe_keypad_variant *variant = keypad->variant;
259 struct stmpe *stmpe = keypad->stmpe;
260 int ret;
261
262 if (keypad->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
263 return -EINVAL;
264
265 if (keypad->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
266 return -EINVAL;
267
268 ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD);
269 if (ret < 0)
270 return ret;
271
272 ret = stmpe_keypad_altfunc_init(keypad);
273 if (ret < 0)
274 return ret;
275
276 ret = stmpe_reg_write(stmpe, STMPE_KPC_COL, keypad->cols);
277 if (ret < 0)
278 return ret;
279
280 ret = stmpe_reg_write(stmpe, STMPE_KPC_ROW_LSB, keypad->rows);
281 if (ret < 0)
282 return ret;
283
284 if (variant->max_rows > 8) {
285 ret = stmpe_set_bits(stmpe, STMPE_KPC_ROW_MSB,
286 STMPE_KPC_ROW_MSB_ROWS,
287 keypad->rows >> 8);
288 if (ret < 0)
289 return ret;
290 }
291
292 ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB,
293 STMPE_KPC_CTRL_MSB_SCAN_COUNT,
294 keypad->scan_count << 4);
295 if (ret < 0)
296 return ret;
297
298 return stmpe_set_bits(stmpe, STMPE_KPC_CTRL_LSB,
299 STMPE_KPC_CTRL_LSB_SCAN |
300 STMPE_KPC_CTRL_LSB_DEBOUNCE,
301 STMPE_KPC_CTRL_LSB_SCAN |
302 (keypad->debounce_ms << 1));
303}
304
305static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad,
306 u32 used_rows, u32 used_cols)
307{
308 int row, col;
309
310 for (row = 0; row < used_rows; row++) {
311 for (col = 0; col < used_cols; col++) {
312 int code = MATRIX_SCAN_CODE(row, col,
313 STMPE_KEYPAD_ROW_SHIFT);
314 if (keypad->keymap[code] != KEY_RESERVED) {
315 keypad->rows |= 1 << row;
316 keypad->cols |= 1 << col;
317 }
318 }
319 }
320}
321
322static int stmpe_keypad_probe(struct platform_device *pdev)
323{
324 struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
325 struct device_node *np = pdev->dev.of_node;
326 struct stmpe_keypad *keypad;
327 struct input_dev *input;
328 u32 rows;
329 u32 cols;
330 int error;
331 int irq;
332
333 irq = platform_get_irq(pdev, 0);
334 if (irq < 0)
335 return irq;
336
337 keypad = devm_kzalloc(&pdev->dev, sizeof(struct stmpe_keypad),
338 GFP_KERNEL);
339 if (!keypad)
340 return -ENOMEM;
341
342 keypad->stmpe = stmpe;
343 keypad->variant = &stmpe_keypad_variants[stmpe->partnum];
344
345 of_property_read_u32(np, "debounce-interval", &keypad->debounce_ms);
346 of_property_read_u32(np, "st,scan-count", &keypad->scan_count);
347 keypad->no_autorepeat = of_property_read_bool(np, "st,no-autorepeat");
348
349 input = devm_input_allocate_device(&pdev->dev);
350 if (!input)
351 return -ENOMEM;
352
353 input->name = "STMPE keypad";
354 input->id.bustype = BUS_I2C;
355 input->dev.parent = &pdev->dev;
356
357 error = matrix_keypad_parse_of_params(&pdev->dev, &rows, &cols);
358 if (error)
359 return error;
360
361 error = matrix_keypad_build_keymap(NULL, NULL, rows, cols,
362 keypad->keymap, input);
363 if (error)
364 return error;
365
366 input_set_capability(input, EV_MSC, MSC_SCAN);
367 if (!keypad->no_autorepeat)
368 __set_bit(EV_REP, input->evbit);
369
370 stmpe_keypad_fill_used_pins(keypad, rows, cols);
371
372 keypad->input = input;
373
374 error = stmpe_keypad_chip_init(keypad);
375 if (error < 0)
376 return error;
377
378 error = devm_request_threaded_irq(&pdev->dev, irq,
379 NULL, stmpe_keypad_irq,
380 IRQF_ONESHOT, "stmpe-keypad", keypad);
381 if (error) {
382 dev_err(&pdev->dev, "unable to get irq: %d\n", error);
383 return error;
384 }
385
386 error = input_register_device(input);
387 if (error) {
388 dev_err(&pdev->dev,
389 "unable to register input device: %d\n", error);
390 return error;
391 }
392
393 platform_set_drvdata(pdev, keypad);
394
395 return 0;
396}
397
398static int stmpe_keypad_remove(struct platform_device *pdev)
399{
400 struct stmpe_keypad *keypad = platform_get_drvdata(pdev);
401
402 stmpe_disable(keypad->stmpe, STMPE_BLOCK_KEYPAD);
403
404 return 0;
405}
406
407static struct platform_driver stmpe_keypad_driver = {
408 .driver.name = "stmpe-keypad",
409 .driver.owner = THIS_MODULE,
410 .probe = stmpe_keypad_probe,
411 .remove = stmpe_keypad_remove,
412};
413module_platform_driver(stmpe_keypad_driver);
414
415MODULE_LICENSE("GPL v2");
416MODULE_DESCRIPTION("STMPExxxx keypad driver");
417MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
418
