David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 1 | /* |
| 2 | * twl4030_keypad.c - driver for 8x8 keypad controller in twl4030 chips |
| 3 | * |
| 4 | * Copyright (C) 2007 Texas Instruments, Inc. |
| 5 | * Copyright (C) 2008 Nokia Corporation |
| 6 | * |
| 7 | * Code re-written for 2430SDP by: |
| 8 | * Syed Mohammed Khasim <x0khasim@ti.com> |
| 9 | * |
| 10 | * Initial Code: |
| 11 | * Manjunatha G K <manjugk@ti.com> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 26 | */ |
| 27 | |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/input.h> |
| 33 | #include <linux/platform_device.h> |
Santosh Shilimkar | b07682b | 2009-12-13 20:05:51 +0100 | [diff] [blame] | 34 | #include <linux/i2c/twl.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 35 | #include <linux/slab.h> |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 36 | |
| 37 | |
| 38 | /* |
| 39 | * The TWL4030 family chips include a keypad controller that supports |
| 40 | * up to an 8x8 switch matrix. The controller can issue system wakeup |
| 41 | * events, since it uses only the always-on 32KiHz oscillator, and has |
| 42 | * an internal state machine that decodes pressed keys, including |
| 43 | * multi-key combinations. |
| 44 | * |
| 45 | * This driver lets boards define what keycodes they wish to report for |
| 46 | * which scancodes, as part of the "struct twl4030_keypad_data" used in |
| 47 | * the probe() routine. |
| 48 | * |
| 49 | * See the TPS65950 documentation; that's the general availability |
| 50 | * version of the TWL5030 second generation part. |
| 51 | */ |
| 52 | #define TWL4030_MAX_ROWS 8 /* TWL4030 hard limit */ |
| 53 | #define TWL4030_MAX_COLS 8 |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 54 | /* |
| 55 | * Note that we add space for an extra column so that we can handle |
| 56 | * row lines connected to the gnd (see twl4030_col_xlate()). |
| 57 | */ |
| 58 | #define TWL4030_ROW_SHIFT 4 |
| 59 | #define TWL4030_KEYMAP_SIZE (TWL4030_MAX_ROWS << TWL4030_ROW_SHIFT) |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 60 | |
| 61 | struct twl4030_keypad { |
| 62 | unsigned short keymap[TWL4030_KEYMAP_SIZE]; |
| 63 | u16 kp_state[TWL4030_MAX_ROWS]; |
| 64 | unsigned n_rows; |
| 65 | unsigned n_cols; |
| 66 | unsigned irq; |
| 67 | |
| 68 | struct device *dbg_dev; |
| 69 | struct input_dev *input; |
| 70 | }; |
| 71 | |
| 72 | /*----------------------------------------------------------------------*/ |
| 73 | |
| 74 | /* arbitrary prescaler value 0..7 */ |
| 75 | #define PTV_PRESCALER 4 |
| 76 | |
| 77 | /* Register Offsets */ |
| 78 | #define KEYP_CTRL 0x00 |
| 79 | #define KEYP_DEB 0x01 |
| 80 | #define KEYP_LONG_KEY 0x02 |
| 81 | #define KEYP_LK_PTV 0x03 |
| 82 | #define KEYP_TIMEOUT_L 0x04 |
| 83 | #define KEYP_TIMEOUT_H 0x05 |
| 84 | #define KEYP_KBC 0x06 |
| 85 | #define KEYP_KBR 0x07 |
| 86 | #define KEYP_SMS 0x08 |
| 87 | #define KEYP_FULL_CODE_7_0 0x09 /* row 0 column status */ |
| 88 | #define KEYP_FULL_CODE_15_8 0x0a /* ... row 1 ... */ |
| 89 | #define KEYP_FULL_CODE_23_16 0x0b |
| 90 | #define KEYP_FULL_CODE_31_24 0x0c |
| 91 | #define KEYP_FULL_CODE_39_32 0x0d |
| 92 | #define KEYP_FULL_CODE_47_40 0x0e |
| 93 | #define KEYP_FULL_CODE_55_48 0x0f |
| 94 | #define KEYP_FULL_CODE_63_56 0x10 |
| 95 | #define KEYP_ISR1 0x11 |
| 96 | #define KEYP_IMR1 0x12 |
| 97 | #define KEYP_ISR2 0x13 |
| 98 | #define KEYP_IMR2 0x14 |
| 99 | #define KEYP_SIR 0x15 |
| 100 | #define KEYP_EDR 0x16 /* edge triggers */ |
| 101 | #define KEYP_SIH_CTRL 0x17 |
| 102 | |
| 103 | /* KEYP_CTRL_REG Fields */ |
| 104 | #define KEYP_CTRL_SOFT_NRST BIT(0) |
| 105 | #define KEYP_CTRL_SOFTMODEN BIT(1) |
| 106 | #define KEYP_CTRL_LK_EN BIT(2) |
| 107 | #define KEYP_CTRL_TOE_EN BIT(3) |
| 108 | #define KEYP_CTRL_TOLE_EN BIT(4) |
| 109 | #define KEYP_CTRL_RP_EN BIT(5) |
| 110 | #define KEYP_CTRL_KBD_ON BIT(6) |
| 111 | |
| 112 | /* KEYP_DEB, KEYP_LONG_KEY, KEYP_TIMEOUT_x*/ |
| 113 | #define KEYP_PERIOD_US(t, prescale) ((t) / (31 << (prescale + 1)) - 1) |
| 114 | |
| 115 | /* KEYP_LK_PTV_REG Fields */ |
| 116 | #define KEYP_LK_PTV_PTV_SHIFT 5 |
| 117 | |
| 118 | /* KEYP_{IMR,ISR,SIR} Fields */ |
| 119 | #define KEYP_IMR1_MIS BIT(3) |
| 120 | #define KEYP_IMR1_TO BIT(2) |
| 121 | #define KEYP_IMR1_LK BIT(1) |
| 122 | #define KEYP_IMR1_KP BIT(0) |
| 123 | |
| 124 | /* KEYP_EDR Fields */ |
| 125 | #define KEYP_EDR_KP_FALLING 0x01 |
| 126 | #define KEYP_EDR_KP_RISING 0x02 |
| 127 | #define KEYP_EDR_KP_BOTH 0x03 |
| 128 | #define KEYP_EDR_LK_FALLING 0x04 |
| 129 | #define KEYP_EDR_LK_RISING 0x08 |
| 130 | #define KEYP_EDR_TO_FALLING 0x10 |
| 131 | #define KEYP_EDR_TO_RISING 0x20 |
| 132 | #define KEYP_EDR_MIS_FALLING 0x40 |
| 133 | #define KEYP_EDR_MIS_RISING 0x80 |
| 134 | |
| 135 | |
| 136 | /*----------------------------------------------------------------------*/ |
| 137 | |
| 138 | static int twl4030_kpread(struct twl4030_keypad *kp, |
| 139 | u8 *data, u32 reg, u8 num_bytes) |
| 140 | { |
Balaji T K | fc7b92f | 2009-12-13 21:23:33 +0100 | [diff] [blame] | 141 | int ret = twl_i2c_read(TWL4030_MODULE_KEYPAD, data, reg, num_bytes); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 142 | |
| 143 | if (ret < 0) |
| 144 | dev_warn(kp->dbg_dev, |
| 145 | "Couldn't read TWL4030: %X - ret %d[%x]\n", |
| 146 | reg, ret, ret); |
| 147 | |
| 148 | return ret; |
| 149 | } |
| 150 | |
| 151 | static int twl4030_kpwrite_u8(struct twl4030_keypad *kp, u8 data, u32 reg) |
| 152 | { |
Balaji T K | fc7b92f | 2009-12-13 21:23:33 +0100 | [diff] [blame] | 153 | int ret = twl_i2c_write_u8(TWL4030_MODULE_KEYPAD, data, reg); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 154 | |
| 155 | if (ret < 0) |
| 156 | dev_warn(kp->dbg_dev, |
| 157 | "Could not write TWL4030: %X - ret %d[%x]\n", |
| 158 | reg, ret, ret); |
| 159 | |
| 160 | return ret; |
| 161 | } |
| 162 | |
| 163 | static inline u16 twl4030_col_xlate(struct twl4030_keypad *kp, u8 col) |
| 164 | { |
| 165 | /* If all bits in a row are active for all coloumns then |
| 166 | * we have that row line connected to gnd. Mark this |
| 167 | * key on as if it was on matrix position n_cols (ie |
| 168 | * one higher than the size of the matrix). |
| 169 | */ |
| 170 | if (col == 0xFF) |
| 171 | return 1 << kp->n_cols; |
| 172 | else |
| 173 | return col & ((1 << kp->n_cols) - 1); |
| 174 | } |
| 175 | |
| 176 | static int twl4030_read_kp_matrix_state(struct twl4030_keypad *kp, u16 *state) |
| 177 | { |
| 178 | u8 new_state[TWL4030_MAX_ROWS]; |
| 179 | int row; |
| 180 | int ret = twl4030_kpread(kp, new_state, |
| 181 | KEYP_FULL_CODE_7_0, kp->n_rows); |
| 182 | if (ret >= 0) |
| 183 | for (row = 0; row < kp->n_rows; row++) |
| 184 | state[row] = twl4030_col_xlate(kp, new_state[row]); |
| 185 | |
| 186 | return ret; |
| 187 | } |
| 188 | |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 189 | static bool twl4030_is_in_ghost_state(struct twl4030_keypad *kp, u16 *key_state) |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 190 | { |
| 191 | int i; |
| 192 | u16 check = 0; |
| 193 | |
| 194 | for (i = 0; i < kp->n_rows; i++) { |
| 195 | u16 col = key_state[i]; |
| 196 | |
| 197 | if ((col & check) && hweight16(col) > 1) |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 198 | return true; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 199 | |
| 200 | check |= col; |
| 201 | } |
| 202 | |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 203 | return false; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | static void twl4030_kp_scan(struct twl4030_keypad *kp, bool release_all) |
| 207 | { |
| 208 | struct input_dev *input = kp->input; |
| 209 | u16 new_state[TWL4030_MAX_ROWS]; |
| 210 | int col, row; |
| 211 | |
| 212 | if (release_all) |
| 213 | memset(new_state, 0, sizeof(new_state)); |
| 214 | else { |
| 215 | /* check for any changes */ |
| 216 | int ret = twl4030_read_kp_matrix_state(kp, new_state); |
| 217 | |
| 218 | if (ret < 0) /* panic ... */ |
| 219 | return; |
| 220 | |
| 221 | if (twl4030_is_in_ghost_state(kp, new_state)) |
| 222 | return; |
| 223 | } |
| 224 | |
| 225 | /* check for changes and print those */ |
| 226 | for (row = 0; row < kp->n_rows; row++) { |
| 227 | int changed = new_state[row] ^ kp->kp_state[row]; |
| 228 | |
| 229 | if (!changed) |
| 230 | continue; |
| 231 | |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 232 | /* Extra column handles "all gnd" rows */ |
| 233 | for (col = 0; col < kp->n_cols + 1; col++) { |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 234 | int code; |
| 235 | |
| 236 | if (!(changed & (1 << col))) |
| 237 | continue; |
| 238 | |
| 239 | dev_dbg(kp->dbg_dev, "key [%d:%d] %s\n", row, col, |
| 240 | (new_state[row] & (1 << col)) ? |
| 241 | "press" : "release"); |
| 242 | |
| 243 | code = MATRIX_SCAN_CODE(row, col, TWL4030_ROW_SHIFT); |
| 244 | input_event(input, EV_MSC, MSC_SCAN, code); |
| 245 | input_report_key(input, kp->keymap[code], |
| 246 | new_state[row] & (1 << col)); |
| 247 | } |
| 248 | kp->kp_state[row] = new_state[row]; |
| 249 | } |
| 250 | input_sync(input); |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Keypad interrupt handler |
| 255 | */ |
| 256 | static irqreturn_t do_kp_irq(int irq, void *_kp) |
| 257 | { |
| 258 | struct twl4030_keypad *kp = _kp; |
| 259 | u8 reg; |
| 260 | int ret; |
| 261 | |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 262 | /* Read & Clear TWL4030 pending interrupt */ |
| 263 | ret = twl4030_kpread(kp, ®, KEYP_ISR1, 1); |
| 264 | |
| 265 | /* Release all keys if I2C has gone bad or |
| 266 | * the KEYP has gone to idle state */ |
| 267 | if (ret >= 0 && (reg & KEYP_IMR1_KP)) |
| 268 | twl4030_kp_scan(kp, false); |
| 269 | else |
| 270 | twl4030_kp_scan(kp, true); |
| 271 | |
| 272 | return IRQ_HANDLED; |
| 273 | } |
| 274 | |
| 275 | static int __devinit twl4030_kp_program(struct twl4030_keypad *kp) |
| 276 | { |
| 277 | u8 reg; |
| 278 | int i; |
| 279 | |
| 280 | /* Enable controller, with hardware decoding but not autorepeat */ |
| 281 | reg = KEYP_CTRL_SOFT_NRST | KEYP_CTRL_SOFTMODEN |
| 282 | | KEYP_CTRL_TOE_EN | KEYP_CTRL_KBD_ON; |
| 283 | if (twl4030_kpwrite_u8(kp, reg, KEYP_CTRL) < 0) |
| 284 | return -EIO; |
| 285 | |
| 286 | /* NOTE: we could use sih_setup() here to package keypad |
| 287 | * event sources as four different IRQs ... but we don't. |
| 288 | */ |
| 289 | |
| 290 | /* Enable TO rising and KP rising and falling edge detection */ |
| 291 | reg = KEYP_EDR_KP_BOTH | KEYP_EDR_TO_RISING; |
| 292 | if (twl4030_kpwrite_u8(kp, reg, KEYP_EDR) < 0) |
| 293 | return -EIO; |
| 294 | |
| 295 | /* Set PTV prescaler Field */ |
| 296 | reg = (PTV_PRESCALER << KEYP_LK_PTV_PTV_SHIFT); |
| 297 | if (twl4030_kpwrite_u8(kp, reg, KEYP_LK_PTV) < 0) |
| 298 | return -EIO; |
| 299 | |
| 300 | /* Set key debounce time to 20 ms */ |
| 301 | i = KEYP_PERIOD_US(20000, PTV_PRESCALER); |
| 302 | if (twl4030_kpwrite_u8(kp, i, KEYP_DEB) < 0) |
| 303 | return -EIO; |
| 304 | |
| 305 | /* Set timeout period to 100 ms */ |
| 306 | i = KEYP_PERIOD_US(200000, PTV_PRESCALER); |
| 307 | if (twl4030_kpwrite_u8(kp, (i & 0xFF), KEYP_TIMEOUT_L) < 0) |
| 308 | return -EIO; |
| 309 | |
| 310 | if (twl4030_kpwrite_u8(kp, (i >> 8), KEYP_TIMEOUT_H) < 0) |
| 311 | return -EIO; |
| 312 | |
| 313 | /* |
| 314 | * Enable Clear-on-Read; disable remembering events that fire |
| 315 | * after the IRQ but before our handler acks (reads) them, |
| 316 | */ |
| 317 | reg = TWL4030_SIH_CTRL_COR_MASK | TWL4030_SIH_CTRL_PENDDIS_MASK; |
| 318 | if (twl4030_kpwrite_u8(kp, reg, KEYP_SIH_CTRL) < 0) |
| 319 | return -EIO; |
| 320 | |
| 321 | /* initialize key state; irqs update it from here on */ |
| 322 | if (twl4030_read_kp_matrix_state(kp, kp->kp_state) < 0) |
| 323 | return -EIO; |
| 324 | |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | /* |
| 329 | * Registers keypad device with input subsystem |
| 330 | * and configures TWL4030 keypad registers |
| 331 | */ |
| 332 | static int __devinit twl4030_kp_probe(struct platform_device *pdev) |
| 333 | { |
| 334 | struct twl4030_keypad_data *pdata = pdev->dev.platform_data; |
Axel Lin | c68b208 | 2011-04-11 23:50:02 -0700 | [diff] [blame] | 335 | const struct matrix_keymap_data *keymap_data; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 336 | struct twl4030_keypad *kp; |
| 337 | struct input_dev *input; |
| 338 | u8 reg; |
| 339 | int error; |
| 340 | |
Shubhrajyoti D | 8f74c06 | 2011-04-06 15:31:22 -0700 | [diff] [blame] | 341 | if (!pdata || !pdata->rows || !pdata->cols || !pdata->keymap_data || |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 342 | pdata->rows > TWL4030_MAX_ROWS || pdata->cols > TWL4030_MAX_COLS) { |
| 343 | dev_err(&pdev->dev, "Invalid platform_data\n"); |
| 344 | return -EINVAL; |
| 345 | } |
| 346 | |
Axel Lin | c68b208 | 2011-04-11 23:50:02 -0700 | [diff] [blame] | 347 | keymap_data = pdata->keymap_data; |
| 348 | |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 349 | kp = kzalloc(sizeof(*kp), GFP_KERNEL); |
| 350 | input = input_allocate_device(); |
| 351 | if (!kp || !input) { |
| 352 | error = -ENOMEM; |
| 353 | goto err1; |
| 354 | } |
| 355 | |
| 356 | /* Get the debug Device */ |
| 357 | kp->dbg_dev = &pdev->dev; |
| 358 | kp->input = input; |
| 359 | |
| 360 | kp->n_rows = pdata->rows; |
| 361 | kp->n_cols = pdata->cols; |
| 362 | kp->irq = platform_get_irq(pdev, 0); |
| 363 | |
| 364 | /* setup input device */ |
| 365 | __set_bit(EV_KEY, input->evbit); |
| 366 | |
| 367 | /* Enable auto repeat feature of Linux input subsystem */ |
| 368 | if (pdata->rep) |
| 369 | __set_bit(EV_REP, input->evbit); |
| 370 | |
| 371 | input_set_capability(input, EV_MSC, MSC_SCAN); |
| 372 | |
| 373 | input->name = "TWL4030 Keypad"; |
| 374 | input->phys = "twl4030_keypad/input0"; |
| 375 | input->dev.parent = &pdev->dev; |
| 376 | |
| 377 | input->id.bustype = BUS_HOST; |
| 378 | input->id.vendor = 0x0001; |
| 379 | input->id.product = 0x0001; |
| 380 | input->id.version = 0x0003; |
| 381 | |
| 382 | input->keycode = kp->keymap; |
| 383 | input->keycodesize = sizeof(kp->keymap[0]); |
| 384 | input->keycodemax = ARRAY_SIZE(kp->keymap); |
| 385 | |
| 386 | matrix_keypad_build_keymap(keymap_data, TWL4030_ROW_SHIFT, |
| 387 | input->keycode, input->keybit); |
| 388 | |
| 389 | error = input_register_device(input); |
| 390 | if (error) { |
| 391 | dev_err(kp->dbg_dev, |
| 392 | "Unable to register twl4030 keypad device\n"); |
| 393 | goto err1; |
| 394 | } |
| 395 | |
| 396 | error = twl4030_kp_program(kp); |
| 397 | if (error) |
| 398 | goto err2; |
| 399 | |
| 400 | /* |
| 401 | * This ISR will always execute in kernel thread context because of |
| 402 | * the need to access the TWL4030 over the I2C bus. |
| 403 | * |
| 404 | * NOTE: we assume this host is wired to TWL4040 INT1, not INT2 ... |
| 405 | */ |
Felipe Balbi | 3f58061 | 2009-12-29 23:15:51 -0800 | [diff] [blame] | 406 | error = request_threaded_irq(kp->irq, NULL, do_kp_irq, |
| 407 | 0, pdev->name, kp); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 408 | if (error) { |
| 409 | dev_info(kp->dbg_dev, "request_irq failed for irq no=%d\n", |
| 410 | kp->irq); |
Dmitry Torokhov | a9cc020 | 2010-09-29 18:36:00 -0700 | [diff] [blame] | 411 | goto err2; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | /* Enable KP and TO interrupts now. */ |
| 415 | reg = (u8) ~(KEYP_IMR1_KP | KEYP_IMR1_TO); |
| 416 | if (twl4030_kpwrite_u8(kp, reg, KEYP_IMR1)) { |
| 417 | error = -EIO; |
Dmitry Torokhov | a9cc020 | 2010-09-29 18:36:00 -0700 | [diff] [blame] | 418 | goto err3; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | platform_set_drvdata(pdev, kp); |
| 422 | return 0; |
| 423 | |
Dmitry Torokhov | a9cc020 | 2010-09-29 18:36:00 -0700 | [diff] [blame] | 424 | err3: |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 425 | /* mask all events - we don't care about the result */ |
| 426 | (void) twl4030_kpwrite_u8(kp, 0xff, KEYP_IMR1); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 427 | free_irq(kp->irq, NULL); |
| 428 | err2: |
| 429 | input_unregister_device(input); |
| 430 | input = NULL; |
| 431 | err1: |
| 432 | input_free_device(input); |
| 433 | kfree(kp); |
| 434 | return error; |
| 435 | } |
| 436 | |
| 437 | static int __devexit twl4030_kp_remove(struct platform_device *pdev) |
| 438 | { |
| 439 | struct twl4030_keypad *kp = platform_get_drvdata(pdev); |
| 440 | |
| 441 | free_irq(kp->irq, kp); |
| 442 | input_unregister_device(kp->input); |
| 443 | platform_set_drvdata(pdev, NULL); |
| 444 | kfree(kp); |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * NOTE: twl4030 are multi-function devices connected via I2C. |
| 451 | * So this device is a child of an I2C parent, thus it needs to |
| 452 | * support unplug/replug (which most platform devices don't). |
| 453 | */ |
| 454 | |
| 455 | static struct platform_driver twl4030_kp_driver = { |
| 456 | .probe = twl4030_kp_probe, |
| 457 | .remove = __devexit_p(twl4030_kp_remove), |
| 458 | .driver = { |
| 459 | .name = "twl4030_keypad", |
| 460 | .owner = THIS_MODULE, |
| 461 | }, |
| 462 | }; |
JJ Ding | 5146c84 | 2011-11-29 11:08:39 -0800 | [diff] [blame] | 463 | module_platform_driver(twl4030_kp_driver); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 464 | |
| 465 | MODULE_AUTHOR("Texas Instruments"); |
| 466 | MODULE_DESCRIPTION("TWL4030 Keypad Driver"); |
| 467 | MODULE_LICENSE("GPL"); |
| 468 | MODULE_ALIAS("platform:twl4030_keypad"); |
| 469 | |