Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 | /* * Copyright (C) ST-Ericsson SA 2010 * * License Terms: GNU General Public License, version 2 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson */ #include <linux/module.h> #include <linux/slab.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/input/matrix_keypad.h> #include <linux/mfd/stmpe.h> /* These are at the same addresses in all STMPE variants */ #define STMPE_KPC_COL 0x60 #define STMPE_KPC_ROW_MSB 0x61 #define STMPE_KPC_ROW_LSB 0x62 #define STMPE_KPC_CTRL_MSB 0x63 #define STMPE_KPC_CTRL_LSB 0x64 #define STMPE_KPC_COMBI_KEY_0 0x65 #define STMPE_KPC_COMBI_KEY_1 0x66 #define STMPE_KPC_COMBI_KEY_2 0x67 #define STMPE_KPC_DATA_BYTE0 0x68 #define STMPE_KPC_DATA_BYTE1 0x69 #define STMPE_KPC_DATA_BYTE2 0x6a #define STMPE_KPC_DATA_BYTE3 0x6b #define STMPE_KPC_DATA_BYTE4 0x6c #define STMPE_KPC_CTRL_LSB_SCAN (0x1 << 0) #define STMPE_KPC_CTRL_LSB_DEBOUNCE (0x7f << 1) #define STMPE_KPC_CTRL_MSB_SCAN_COUNT (0xf << 4) #define STMPE_KPC_ROW_MSB_ROWS 0xff #define STMPE_KPC_DATA_UP (0x1 << 7) #define STMPE_KPC_DATA_ROW (0xf << 3) #define STMPE_KPC_DATA_COL (0x7 << 0) #define STMPE_KPC_DATA_NOKEY_MASK 0x78 #define STMPE_KEYPAD_MAX_DEBOUNCE 127 #define STMPE_KEYPAD_MAX_SCAN_COUNT 15 #define STMPE_KEYPAD_MAX_ROWS 8 #define STMPE_KEYPAD_MAX_COLS 8 #define STMPE_KEYPAD_ROW_SHIFT 3 #define STMPE_KEYPAD_KEYMAP_MAX_SIZE \ (STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS) #define STMPE1601_NUM_DATA 5 #define STMPE2401_NUM_DATA 3 #define STMPE2403_NUM_DATA 5 /* Make sure it covers all cases above */ #define MAX_NUM_DATA 5 /** * struct stmpe_keypad_variant - model-specific attributes * @auto_increment: whether the KPC_DATA_BYTE register address * auto-increments on multiple read * @set_pullup: whether the pins need to have their pull-ups set * @num_data: number of data bytes * @num_normal_data: number of normal keys' data bytes * @max_cols: maximum number of columns supported * @max_rows: maximum number of rows supported * @col_gpios: bitmask of gpios which can be used for columns * @row_gpios: bitmask of gpios which can be used for rows */ struct stmpe_keypad_variant { bool auto_increment; bool set_pullup; int num_data; int num_normal_data; int max_cols; int max_rows; unsigned int col_gpios; unsigned int row_gpios; }; static const struct stmpe_keypad_variant stmpe_keypad_variants[] = { [STMPE1601] = { .auto_increment = true, .num_data = STMPE1601_NUM_DATA, .num_normal_data = 3, .max_cols = 8, .max_rows = 8, .col_gpios = 0x000ff, /* GPIO 0 - 7 */ .row_gpios = 0x0ff00, /* GPIO 8 - 15 */ }, [STMPE2401] = { .auto_increment = false, .set_pullup = true, .num_data = STMPE2401_NUM_DATA, .num_normal_data = 2, .max_cols = 8, .max_rows = 12, .col_gpios = 0x0000ff, /* GPIO 0 - 7*/ .row_gpios = 0x1f7f00, /* GPIO 8-14, 16-20 */ }, [STMPE2403] = { .auto_increment = true, .set_pullup = true, .num_data = STMPE2403_NUM_DATA, .num_normal_data = 3, .max_cols = 8, .max_rows = 12, .col_gpios = 0x0000ff, /* GPIO 0 - 7*/ .row_gpios = 0x1fef00, /* GPIO 8-14, 16-20 */ }, }; /** * struct stmpe_keypad - STMPE keypad state container * @stmpe: pointer to parent STMPE device * @input: spawned input device * @variant: STMPE variant * @debounce_ms: debounce interval, in ms. Maximum is * %STMPE_KEYPAD_MAX_DEBOUNCE. * @scan_count: number of key scanning cycles to confirm key data. * Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT. * @no_autorepeat: disable key autorepeat * @rows: bitmask for the rows * @cols: bitmask for the columns * @keymap: the keymap */ struct stmpe_keypad { struct stmpe *stmpe; struct input_dev *input; const struct stmpe_keypad_variant *variant; unsigned int debounce_ms; unsigned int scan_count; bool no_autorepeat; unsigned int rows; unsigned int cols; unsigned short keymap[STMPE_KEYPAD_KEYMAP_MAX_SIZE]; }; static int stmpe_keypad_read_data(struct stmpe_keypad *keypad, u8 *data) { const struct stmpe_keypad_variant *variant = keypad->variant; struct stmpe *stmpe = keypad->stmpe; int ret; int i; if (variant->auto_increment) return stmpe_block_read(stmpe, STMPE_KPC_DATA_BYTE0, variant->num_data, data); for (i = 0; i < variant->num_data; i++) { ret = stmpe_reg_read(stmpe, STMPE_KPC_DATA_BYTE0 + i); if (ret < 0) return ret; data[i] = ret; } return 0; } static irqreturn_t stmpe_keypad_irq(int irq, void *dev) { struct stmpe_keypad *keypad = dev; struct input_dev *input = keypad->input; const struct stmpe_keypad_variant *variant = keypad->variant; u8 fifo[MAX_NUM_DATA]; int ret; int i; ret = stmpe_keypad_read_data(keypad, fifo); if (ret < 0) return IRQ_NONE; for (i = 0; i < variant->num_normal_data; i++) { u8 data = fifo[i]; int row = (data & STMPE_KPC_DATA_ROW) >> 3; int col = data & STMPE_KPC_DATA_COL; int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT); bool up = data & STMPE_KPC_DATA_UP; if ((data & STMPE_KPC_DATA_NOKEY_MASK) == STMPE_KPC_DATA_NOKEY_MASK) continue; input_event(input, EV_MSC, MSC_SCAN, code); input_report_key(input, keypad->keymap[code], !up); input_sync(input); } return IRQ_HANDLED; } static int stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad) { const struct stmpe_keypad_variant *variant = keypad->variant; unsigned int col_gpios = variant->col_gpios; unsigned int row_gpios = variant->row_gpios; struct stmpe *stmpe = keypad->stmpe; u8 pureg = stmpe->regs[STMPE_IDX_GPPUR_LSB]; unsigned int pins = 0; unsigned int pu_pins = 0; int ret; int i; /* * Figure out which pins need to be set to the keypad alternate * function. * * {cols,rows}_gpios are bitmasks of which pins on the chip can be used * for the keypad. * * keypad->{cols,rows} are a bitmask of which pins (of the ones useable * for the keypad) are used on the board. */ for (i = 0; i < variant->max_cols; i++) { int num = __ffs(col_gpios); if (keypad->cols & (1 << i)) { pins |= 1 << num; pu_pins |= 1 << num; } col_gpios &= ~(1 << num); } for (i = 0; i < variant->max_rows; i++) { int num = __ffs(row_gpios); if (keypad->rows & (1 << i)) pins |= 1 << num; row_gpios &= ~(1 << num); } ret = stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD); if (ret) return ret; /* * On STMPE24xx, set pin bias to pull-up on all keypad input * pins (columns), this incidentally happen to be maximum 8 pins * and placed at GPIO0-7 so only the LSB of the pull up register * ever needs to be written. */ if (variant->set_pullup) { u8 val; ret = stmpe_reg_read(stmpe, pureg); if (ret) return ret; /* Do not touch unused pins, may be used for GPIO */ val = ret & ~pu_pins; val |= pu_pins; ret = stmpe_reg_write(stmpe, pureg, val); } return 0; } static int stmpe_keypad_chip_init(struct stmpe_keypad *keypad) { const struct stmpe_keypad_variant *variant = keypad->variant; struct stmpe *stmpe = keypad->stmpe; int ret; if (keypad->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE) return -EINVAL; if (keypad->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT) return -EINVAL; ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD); if (ret < 0) return ret; ret = stmpe_keypad_altfunc_init(keypad); if (ret < 0) return ret; ret = stmpe_reg_write(stmpe, STMPE_KPC_COL, keypad->cols); if (ret < 0) return ret; ret = stmpe_reg_write(stmpe, STMPE_KPC_ROW_LSB, keypad->rows); if (ret < 0) return ret; if (variant->max_rows > 8) { ret = stmpe_set_bits(stmpe, STMPE_KPC_ROW_MSB, STMPE_KPC_ROW_MSB_ROWS, keypad->rows >> 8); if (ret < 0) return ret; } ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB, STMPE_KPC_CTRL_MSB_SCAN_COUNT, keypad->scan_count << 4); if (ret < 0) return ret; return stmpe_set_bits(stmpe, STMPE_KPC_CTRL_LSB, STMPE_KPC_CTRL_LSB_SCAN | STMPE_KPC_CTRL_LSB_DEBOUNCE, STMPE_KPC_CTRL_LSB_SCAN | (keypad->debounce_ms << 1)); } static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad, u32 used_rows, u32 used_cols) { int row, col; for (row = 0; row < used_rows; row++) { for (col = 0; col < used_cols; col++) { int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT); if (keypad->keymap[code] != KEY_RESERVED) { keypad->rows |= 1 << row; keypad->cols |= 1 << col; } } } } static int stmpe_keypad_probe(struct platform_device *pdev) { struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent); struct device_node *np = pdev->dev.of_node; struct stmpe_keypad *keypad; struct input_dev *input; u32 rows; u32 cols; int error; int irq; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; keypad = devm_kzalloc(&pdev->dev, sizeof(struct stmpe_keypad), GFP_KERNEL); if (!keypad) return -ENOMEM; keypad->stmpe = stmpe; keypad->variant = &stmpe_keypad_variants[stmpe->partnum]; of_property_read_u32(np, "debounce-interval", &keypad->debounce_ms); of_property_read_u32(np, "st,scan-count", &keypad->scan_count); keypad->no_autorepeat = of_property_read_bool(np, "st,no-autorepeat"); input = devm_input_allocate_device(&pdev->dev); if (!input) return -ENOMEM; input->name = "STMPE keypad"; input->id.bustype = BUS_I2C; input->dev.parent = &pdev->dev; error = matrix_keypad_parse_properties(&pdev->dev, &rows, &cols); if (error) return error; error = matrix_keypad_build_keymap(NULL, NULL, rows, cols, keypad->keymap, input); if (error) return error; input_set_capability(input, EV_MSC, MSC_SCAN); if (!keypad->no_autorepeat) __set_bit(EV_REP, input->evbit); stmpe_keypad_fill_used_pins(keypad, rows, cols); keypad->input = input; error = stmpe_keypad_chip_init(keypad); if (error < 0) return error; error = devm_request_threaded_irq(&pdev->dev, irq, NULL, stmpe_keypad_irq, IRQF_ONESHOT, "stmpe-keypad", keypad); if (error) { dev_err(&pdev->dev, "unable to get irq: %d\n", error); return error; } error = input_register_device(input); if (error) { dev_err(&pdev->dev, "unable to register input device: %d\n", error); return error; } platform_set_drvdata(pdev, keypad); return 0; } static int stmpe_keypad_remove(struct platform_device *pdev) { struct stmpe_keypad *keypad = platform_get_drvdata(pdev); stmpe_disable(keypad->stmpe, STMPE_BLOCK_KEYPAD); return 0; } static struct platform_driver stmpe_keypad_driver = { .driver.name = "stmpe-keypad", .driver.owner = THIS_MODULE, .probe = stmpe_keypad_probe, .remove = stmpe_keypad_remove, }; module_platform_driver(stmpe_keypad_driver); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("STMPExxxx keypad driver"); MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>"); |