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 | |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 37 | /* |
| 38 | * The TWL4030 family chips include a keypad controller that supports |
| 39 | * up to an 8x8 switch matrix. The controller can issue system wakeup |
| 40 | * events, since it uses only the always-on 32KiHz oscillator, and has |
| 41 | * an internal state machine that decodes pressed keys, including |
| 42 | * multi-key combinations. |
| 43 | * |
| 44 | * This driver lets boards define what keycodes they wish to report for |
| 45 | * which scancodes, as part of the "struct twl4030_keypad_data" used in |
| 46 | * the probe() routine. |
| 47 | * |
| 48 | * See the TPS65950 documentation; that's the general availability |
| 49 | * version of the TWL5030 second generation part. |
| 50 | */ |
| 51 | #define TWL4030_MAX_ROWS 8 /* TWL4030 hard limit */ |
| 52 | #define TWL4030_MAX_COLS 8 |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 53 | /* |
| 54 | * Note that we add space for an extra column so that we can handle |
| 55 | * row lines connected to the gnd (see twl4030_col_xlate()). |
| 56 | */ |
| 57 | #define TWL4030_ROW_SHIFT 4 |
| 58 | #define TWL4030_KEYMAP_SIZE (TWL4030_MAX_ROWS << TWL4030_ROW_SHIFT) |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 59 | |
| 60 | struct twl4030_keypad { |
| 61 | unsigned short keymap[TWL4030_KEYMAP_SIZE]; |
| 62 | u16 kp_state[TWL4030_MAX_ROWS]; |
| 63 | unsigned n_rows; |
| 64 | unsigned n_cols; |
| 65 | unsigned irq; |
| 66 | |
| 67 | struct device *dbg_dev; |
| 68 | struct input_dev *input; |
| 69 | }; |
| 70 | |
| 71 | /*----------------------------------------------------------------------*/ |
| 72 | |
| 73 | /* arbitrary prescaler value 0..7 */ |
| 74 | #define PTV_PRESCALER 4 |
| 75 | |
| 76 | /* Register Offsets */ |
| 77 | #define KEYP_CTRL 0x00 |
| 78 | #define KEYP_DEB 0x01 |
| 79 | #define KEYP_LONG_KEY 0x02 |
| 80 | #define KEYP_LK_PTV 0x03 |
| 81 | #define KEYP_TIMEOUT_L 0x04 |
| 82 | #define KEYP_TIMEOUT_H 0x05 |
| 83 | #define KEYP_KBC 0x06 |
| 84 | #define KEYP_KBR 0x07 |
| 85 | #define KEYP_SMS 0x08 |
| 86 | #define KEYP_FULL_CODE_7_0 0x09 /* row 0 column status */ |
| 87 | #define KEYP_FULL_CODE_15_8 0x0a /* ... row 1 ... */ |
| 88 | #define KEYP_FULL_CODE_23_16 0x0b |
| 89 | #define KEYP_FULL_CODE_31_24 0x0c |
| 90 | #define KEYP_FULL_CODE_39_32 0x0d |
| 91 | #define KEYP_FULL_CODE_47_40 0x0e |
| 92 | #define KEYP_FULL_CODE_55_48 0x0f |
| 93 | #define KEYP_FULL_CODE_63_56 0x10 |
| 94 | #define KEYP_ISR1 0x11 |
| 95 | #define KEYP_IMR1 0x12 |
| 96 | #define KEYP_ISR2 0x13 |
| 97 | #define KEYP_IMR2 0x14 |
| 98 | #define KEYP_SIR 0x15 |
| 99 | #define KEYP_EDR 0x16 /* edge triggers */ |
| 100 | #define KEYP_SIH_CTRL 0x17 |
| 101 | |
| 102 | /* KEYP_CTRL_REG Fields */ |
| 103 | #define KEYP_CTRL_SOFT_NRST BIT(0) |
| 104 | #define KEYP_CTRL_SOFTMODEN BIT(1) |
| 105 | #define KEYP_CTRL_LK_EN BIT(2) |
| 106 | #define KEYP_CTRL_TOE_EN BIT(3) |
| 107 | #define KEYP_CTRL_TOLE_EN BIT(4) |
| 108 | #define KEYP_CTRL_RP_EN BIT(5) |
| 109 | #define KEYP_CTRL_KBD_ON BIT(6) |
| 110 | |
| 111 | /* KEYP_DEB, KEYP_LONG_KEY, KEYP_TIMEOUT_x*/ |
| 112 | #define KEYP_PERIOD_US(t, prescale) ((t) / (31 << (prescale + 1)) - 1) |
| 113 | |
| 114 | /* KEYP_LK_PTV_REG Fields */ |
| 115 | #define KEYP_LK_PTV_PTV_SHIFT 5 |
| 116 | |
| 117 | /* KEYP_{IMR,ISR,SIR} Fields */ |
| 118 | #define KEYP_IMR1_MIS BIT(3) |
| 119 | #define KEYP_IMR1_TO BIT(2) |
| 120 | #define KEYP_IMR1_LK BIT(1) |
| 121 | #define KEYP_IMR1_KP BIT(0) |
| 122 | |
| 123 | /* KEYP_EDR Fields */ |
| 124 | #define KEYP_EDR_KP_FALLING 0x01 |
| 125 | #define KEYP_EDR_KP_RISING 0x02 |
| 126 | #define KEYP_EDR_KP_BOTH 0x03 |
| 127 | #define KEYP_EDR_LK_FALLING 0x04 |
| 128 | #define KEYP_EDR_LK_RISING 0x08 |
| 129 | #define KEYP_EDR_TO_FALLING 0x10 |
| 130 | #define KEYP_EDR_TO_RISING 0x20 |
| 131 | #define KEYP_EDR_MIS_FALLING 0x40 |
| 132 | #define KEYP_EDR_MIS_RISING 0x80 |
| 133 | |
| 134 | |
| 135 | /*----------------------------------------------------------------------*/ |
| 136 | |
| 137 | static int twl4030_kpread(struct twl4030_keypad *kp, |
| 138 | u8 *data, u32 reg, u8 num_bytes) |
| 139 | { |
Balaji T K | fc7b92f | 2009-12-13 21:23:33 +0100 | [diff] [blame] | 140 | int ret = twl_i2c_read(TWL4030_MODULE_KEYPAD, data, reg, num_bytes); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 141 | |
| 142 | if (ret < 0) |
| 143 | dev_warn(kp->dbg_dev, |
| 144 | "Couldn't read TWL4030: %X - ret %d[%x]\n", |
| 145 | reg, ret, ret); |
| 146 | |
| 147 | return ret; |
| 148 | } |
| 149 | |
| 150 | static int twl4030_kpwrite_u8(struct twl4030_keypad *kp, u8 data, u32 reg) |
| 151 | { |
Balaji T K | fc7b92f | 2009-12-13 21:23:33 +0100 | [diff] [blame] | 152 | int ret = twl_i2c_write_u8(TWL4030_MODULE_KEYPAD, data, reg); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 153 | |
| 154 | if (ret < 0) |
| 155 | dev_warn(kp->dbg_dev, |
| 156 | "Could not write TWL4030: %X - ret %d[%x]\n", |
| 157 | reg, ret, ret); |
| 158 | |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | static inline u16 twl4030_col_xlate(struct twl4030_keypad *kp, u8 col) |
| 163 | { |
| 164 | /* If all bits in a row are active for all coloumns then |
| 165 | * we have that row line connected to gnd. Mark this |
| 166 | * key on as if it was on matrix position n_cols (ie |
| 167 | * one higher than the size of the matrix). |
| 168 | */ |
| 169 | if (col == 0xFF) |
| 170 | return 1 << kp->n_cols; |
| 171 | else |
| 172 | return col & ((1 << kp->n_cols) - 1); |
| 173 | } |
| 174 | |
| 175 | static int twl4030_read_kp_matrix_state(struct twl4030_keypad *kp, u16 *state) |
| 176 | { |
| 177 | u8 new_state[TWL4030_MAX_ROWS]; |
| 178 | int row; |
| 179 | int ret = twl4030_kpread(kp, new_state, |
| 180 | KEYP_FULL_CODE_7_0, kp->n_rows); |
| 181 | if (ret >= 0) |
| 182 | for (row = 0; row < kp->n_rows; row++) |
| 183 | state[row] = twl4030_col_xlate(kp, new_state[row]); |
| 184 | |
| 185 | return ret; |
| 186 | } |
| 187 | |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 188 | 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] | 189 | { |
| 190 | int i; |
| 191 | u16 check = 0; |
| 192 | |
| 193 | for (i = 0; i < kp->n_rows; i++) { |
| 194 | u16 col = key_state[i]; |
| 195 | |
| 196 | if ((col & check) && hweight16(col) > 1) |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 197 | return true; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 198 | |
| 199 | check |= col; |
| 200 | } |
| 201 | |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 202 | return false; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static void twl4030_kp_scan(struct twl4030_keypad *kp, bool release_all) |
| 206 | { |
| 207 | struct input_dev *input = kp->input; |
| 208 | u16 new_state[TWL4030_MAX_ROWS]; |
| 209 | int col, row; |
| 210 | |
| 211 | if (release_all) |
| 212 | memset(new_state, 0, sizeof(new_state)); |
| 213 | else { |
| 214 | /* check for any changes */ |
| 215 | int ret = twl4030_read_kp_matrix_state(kp, new_state); |
| 216 | |
| 217 | if (ret < 0) /* panic ... */ |
| 218 | return; |
| 219 | |
| 220 | if (twl4030_is_in_ghost_state(kp, new_state)) |
| 221 | return; |
| 222 | } |
| 223 | |
| 224 | /* check for changes and print those */ |
| 225 | for (row = 0; row < kp->n_rows; row++) { |
| 226 | int changed = new_state[row] ^ kp->kp_state[row]; |
| 227 | |
| 228 | if (!changed) |
| 229 | continue; |
| 230 | |
Dmitry Torokhov | 3fea602 | 2010-07-20 20:25:35 -0700 | [diff] [blame] | 231 | /* Extra column handles "all gnd" rows */ |
| 232 | for (col = 0; col < kp->n_cols + 1; col++) { |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 233 | int code; |
| 234 | |
| 235 | if (!(changed & (1 << col))) |
| 236 | continue; |
| 237 | |
| 238 | dev_dbg(kp->dbg_dev, "key [%d:%d] %s\n", row, col, |
| 239 | (new_state[row] & (1 << col)) ? |
| 240 | "press" : "release"); |
| 241 | |
| 242 | code = MATRIX_SCAN_CODE(row, col, TWL4030_ROW_SHIFT); |
| 243 | input_event(input, EV_MSC, MSC_SCAN, code); |
| 244 | input_report_key(input, kp->keymap[code], |
| 245 | new_state[row] & (1 << col)); |
| 246 | } |
| 247 | kp->kp_state[row] = new_state[row]; |
| 248 | } |
| 249 | input_sync(input); |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Keypad interrupt handler |
| 254 | */ |
| 255 | static irqreturn_t do_kp_irq(int irq, void *_kp) |
| 256 | { |
| 257 | struct twl4030_keypad *kp = _kp; |
| 258 | u8 reg; |
| 259 | int ret; |
| 260 | |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 261 | /* Read & Clear TWL4030 pending interrupt */ |
| 262 | ret = twl4030_kpread(kp, ®, KEYP_ISR1, 1); |
| 263 | |
| 264 | /* Release all keys if I2C has gone bad or |
| 265 | * the KEYP has gone to idle state */ |
| 266 | if (ret >= 0 && (reg & KEYP_IMR1_KP)) |
| 267 | twl4030_kp_scan(kp, false); |
| 268 | else |
| 269 | twl4030_kp_scan(kp, true); |
| 270 | |
| 271 | return IRQ_HANDLED; |
| 272 | } |
| 273 | |
| 274 | static int __devinit twl4030_kp_program(struct twl4030_keypad *kp) |
| 275 | { |
| 276 | u8 reg; |
| 277 | int i; |
| 278 | |
| 279 | /* Enable controller, with hardware decoding but not autorepeat */ |
| 280 | reg = KEYP_CTRL_SOFT_NRST | KEYP_CTRL_SOFTMODEN |
| 281 | | KEYP_CTRL_TOE_EN | KEYP_CTRL_KBD_ON; |
| 282 | if (twl4030_kpwrite_u8(kp, reg, KEYP_CTRL) < 0) |
| 283 | return -EIO; |
| 284 | |
| 285 | /* NOTE: we could use sih_setup() here to package keypad |
| 286 | * event sources as four different IRQs ... but we don't. |
| 287 | */ |
| 288 | |
| 289 | /* Enable TO rising and KP rising and falling edge detection */ |
| 290 | reg = KEYP_EDR_KP_BOTH | KEYP_EDR_TO_RISING; |
| 291 | if (twl4030_kpwrite_u8(kp, reg, KEYP_EDR) < 0) |
| 292 | return -EIO; |
| 293 | |
| 294 | /* Set PTV prescaler Field */ |
| 295 | reg = (PTV_PRESCALER << KEYP_LK_PTV_PTV_SHIFT); |
| 296 | if (twl4030_kpwrite_u8(kp, reg, KEYP_LK_PTV) < 0) |
| 297 | return -EIO; |
| 298 | |
| 299 | /* Set key debounce time to 20 ms */ |
| 300 | i = KEYP_PERIOD_US(20000, PTV_PRESCALER); |
| 301 | if (twl4030_kpwrite_u8(kp, i, KEYP_DEB) < 0) |
| 302 | return -EIO; |
| 303 | |
Felipe Contreras | 4936f97 | 2012-02-01 09:12:23 -0800 | [diff] [blame] | 304 | /* Set timeout period to 200 ms */ |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 305 | i = KEYP_PERIOD_US(200000, PTV_PRESCALER); |
| 306 | if (twl4030_kpwrite_u8(kp, (i & 0xFF), KEYP_TIMEOUT_L) < 0) |
| 307 | return -EIO; |
| 308 | |
| 309 | if (twl4030_kpwrite_u8(kp, (i >> 8), KEYP_TIMEOUT_H) < 0) |
| 310 | return -EIO; |
| 311 | |
| 312 | /* |
| 313 | * Enable Clear-on-Read; disable remembering events that fire |
| 314 | * after the IRQ but before our handler acks (reads) them, |
| 315 | */ |
| 316 | reg = TWL4030_SIH_CTRL_COR_MASK | TWL4030_SIH_CTRL_PENDDIS_MASK; |
| 317 | if (twl4030_kpwrite_u8(kp, reg, KEYP_SIH_CTRL) < 0) |
| 318 | return -EIO; |
| 319 | |
| 320 | /* initialize key state; irqs update it from here on */ |
| 321 | if (twl4030_read_kp_matrix_state(kp, kp->kp_state) < 0) |
| 322 | return -EIO; |
| 323 | |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Registers keypad device with input subsystem |
| 329 | * and configures TWL4030 keypad registers |
| 330 | */ |
| 331 | static int __devinit twl4030_kp_probe(struct platform_device *pdev) |
| 332 | { |
| 333 | struct twl4030_keypad_data *pdata = pdev->dev.platform_data; |
Axel Lin | c68b208 | 2011-04-11 23:50:02 -0700 | [diff] [blame] | 334 | const struct matrix_keymap_data *keymap_data; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 335 | struct twl4030_keypad *kp; |
| 336 | struct input_dev *input; |
| 337 | u8 reg; |
| 338 | int error; |
| 339 | |
Shubhrajyoti D | 8f74c06 | 2011-04-06 15:31:22 -0700 | [diff] [blame] | 340 | if (!pdata || !pdata->rows || !pdata->cols || !pdata->keymap_data || |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 341 | pdata->rows > TWL4030_MAX_ROWS || pdata->cols > TWL4030_MAX_COLS) { |
| 342 | dev_err(&pdev->dev, "Invalid platform_data\n"); |
| 343 | return -EINVAL; |
| 344 | } |
| 345 | |
Axel Lin | c68b208 | 2011-04-11 23:50:02 -0700 | [diff] [blame] | 346 | keymap_data = pdata->keymap_data; |
| 347 | |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 348 | kp = kzalloc(sizeof(*kp), GFP_KERNEL); |
| 349 | input = input_allocate_device(); |
| 350 | if (!kp || !input) { |
| 351 | error = -ENOMEM; |
| 352 | goto err1; |
| 353 | } |
| 354 | |
| 355 | /* Get the debug Device */ |
| 356 | kp->dbg_dev = &pdev->dev; |
| 357 | kp->input = input; |
| 358 | |
| 359 | kp->n_rows = pdata->rows; |
| 360 | kp->n_cols = pdata->cols; |
| 361 | kp->irq = platform_get_irq(pdev, 0); |
| 362 | |
| 363 | /* setup input device */ |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 364 | input->name = "TWL4030 Keypad"; |
| 365 | input->phys = "twl4030_keypad/input0"; |
| 366 | input->dev.parent = &pdev->dev; |
| 367 | |
| 368 | input->id.bustype = BUS_HOST; |
| 369 | input->id.vendor = 0x0001; |
| 370 | input->id.product = 0x0001; |
| 371 | input->id.version = 0x0003; |
| 372 | |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 373 | error = matrix_keypad_build_keymap(keymap_data, NULL, |
| 374 | TWL4030_MAX_ROWS, |
| 375 | 1 << TWL4030_ROW_SHIFT, |
| 376 | kp->keymap, input); |
| 377 | if (error) { |
| 378 | dev_err(kp->dbg_dev, "Failed to build keymap\n"); |
| 379 | goto err1; |
| 380 | } |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 381 | |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 382 | input_set_capability(input, EV_MSC, MSC_SCAN); |
| 383 | /* Enable auto repeat feature of Linux input subsystem */ |
| 384 | if (pdata->rep) |
| 385 | __set_bit(EV_REP, input->evbit); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 386 | |
| 387 | error = input_register_device(input); |
| 388 | if (error) { |
| 389 | dev_err(kp->dbg_dev, |
| 390 | "Unable to register twl4030 keypad device\n"); |
| 391 | goto err1; |
| 392 | } |
| 393 | |
| 394 | error = twl4030_kp_program(kp); |
| 395 | if (error) |
| 396 | goto err2; |
| 397 | |
| 398 | /* |
| 399 | * This ISR will always execute in kernel thread context because of |
| 400 | * the need to access the TWL4030 over the I2C bus. |
| 401 | * |
| 402 | * NOTE: we assume this host is wired to TWL4040 INT1, not INT2 ... |
| 403 | */ |
Felipe Balbi | 3f58061 | 2009-12-29 23:15:51 -0800 | [diff] [blame] | 404 | error = request_threaded_irq(kp->irq, NULL, do_kp_irq, |
| 405 | 0, pdev->name, kp); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 406 | if (error) { |
| 407 | dev_info(kp->dbg_dev, "request_irq failed for irq no=%d\n", |
| 408 | kp->irq); |
Dmitry Torokhov | a9cc020 | 2010-09-29 18:36:00 -0700 | [diff] [blame] | 409 | goto err2; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | /* Enable KP and TO interrupts now. */ |
| 413 | reg = (u8) ~(KEYP_IMR1_KP | KEYP_IMR1_TO); |
| 414 | if (twl4030_kpwrite_u8(kp, reg, KEYP_IMR1)) { |
| 415 | error = -EIO; |
Dmitry Torokhov | a9cc020 | 2010-09-29 18:36:00 -0700 | [diff] [blame] | 416 | goto err3; |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | platform_set_drvdata(pdev, kp); |
| 420 | return 0; |
| 421 | |
Dmitry Torokhov | a9cc020 | 2010-09-29 18:36:00 -0700 | [diff] [blame] | 422 | err3: |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 423 | /* mask all events - we don't care about the result */ |
| 424 | (void) twl4030_kpwrite_u8(kp, 0xff, KEYP_IMR1); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 425 | free_irq(kp->irq, NULL); |
| 426 | err2: |
| 427 | input_unregister_device(input); |
| 428 | input = NULL; |
| 429 | err1: |
| 430 | input_free_device(input); |
| 431 | kfree(kp); |
| 432 | return error; |
| 433 | } |
| 434 | |
| 435 | static int __devexit twl4030_kp_remove(struct platform_device *pdev) |
| 436 | { |
| 437 | struct twl4030_keypad *kp = platform_get_drvdata(pdev); |
| 438 | |
| 439 | free_irq(kp->irq, kp); |
| 440 | input_unregister_device(kp->input); |
| 441 | platform_set_drvdata(pdev, NULL); |
| 442 | kfree(kp); |
| 443 | |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * NOTE: twl4030 are multi-function devices connected via I2C. |
| 449 | * So this device is a child of an I2C parent, thus it needs to |
| 450 | * support unplug/replug (which most platform devices don't). |
| 451 | */ |
| 452 | |
| 453 | static struct platform_driver twl4030_kp_driver = { |
| 454 | .probe = twl4030_kp_probe, |
| 455 | .remove = __devexit_p(twl4030_kp_remove), |
| 456 | .driver = { |
| 457 | .name = "twl4030_keypad", |
| 458 | .owner = THIS_MODULE, |
| 459 | }, |
| 460 | }; |
JJ Ding | 5146c84 | 2011-11-29 11:08:39 -0800 | [diff] [blame] | 461 | module_platform_driver(twl4030_kp_driver); |
David Brownell | 9d83406 | 2009-08-25 19:24:14 -0700 | [diff] [blame] | 462 | |
| 463 | MODULE_AUTHOR("Texas Instruments"); |
| 464 | MODULE_DESCRIPTION("TWL4030 Keypad Driver"); |
| 465 | MODULE_LICENSE("GPL"); |
| 466 | MODULE_ALIAS("platform:twl4030_keypad"); |