Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Keyboard class input driver for the NVIDIA Tegra SoC internal matrix |
| 3 | * keyboard controller |
| 4 | * |
| 5 | * Copyright (c) 2009-2011, NVIDIA Corporation. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 15 | * more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 20 | */ |
| 21 | |
Rakesh Iyer | 3f27757 | 2011-07-30 12:01:48 -0700 | [diff] [blame] | 22 | #include <linux/kernel.h> |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 23 | #include <linux/module.h> |
| 24 | #include <linux/input.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/delay.h> |
| 27 | #include <linux/io.h> |
| 28 | #include <linux/interrupt.h> |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 29 | #include <linux/of.h> |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 30 | #include <linux/clk.h> |
| 31 | #include <linux/slab.h> |
Stephen Warren | a85442a | 2012-09-04 20:27:38 -0700 | [diff] [blame] | 32 | #include <linux/input/tegra_kbc.h> |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 33 | #include <mach/clk.h> |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 34 | |
| 35 | #define KBC_MAX_DEBOUNCE_CNT 0x3ffu |
| 36 | |
| 37 | /* KBC row scan time and delay for beginning the row scan. */ |
| 38 | #define KBC_ROW_SCAN_TIME 16 |
| 39 | #define KBC_ROW_SCAN_DLY 5 |
| 40 | |
| 41 | /* KBC uses a 32KHz clock so a cycle = 1/32Khz */ |
Rakesh Iyer | 3f27757 | 2011-07-30 12:01:48 -0700 | [diff] [blame] | 42 | #define KBC_CYCLE_MS 32 |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 43 | |
| 44 | /* KBC Registers */ |
| 45 | |
| 46 | /* KBC Control Register */ |
| 47 | #define KBC_CONTROL_0 0x0 |
| 48 | #define KBC_FIFO_TH_CNT_SHIFT(cnt) (cnt << 14) |
| 49 | #define KBC_DEBOUNCE_CNT_SHIFT(cnt) (cnt << 4) |
| 50 | #define KBC_CONTROL_FIFO_CNT_INT_EN (1 << 3) |
Rakesh Iyer | b6834b0 | 2012-01-22 23:27:54 -0800 | [diff] [blame] | 51 | #define KBC_CONTROL_KEYPRESS_INT_EN (1 << 1) |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 52 | #define KBC_CONTROL_KBC_EN (1 << 0) |
| 53 | |
| 54 | /* KBC Interrupt Register */ |
| 55 | #define KBC_INT_0 0x4 |
| 56 | #define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2) |
Rakesh Iyer | fd0fc21 | 2011-12-29 19:27:44 -0800 | [diff] [blame] | 57 | #define KBC_INT_KEYPRESS_INT_STATUS (1 << 0) |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 58 | |
| 59 | #define KBC_ROW_CFG0_0 0x8 |
| 60 | #define KBC_COL_CFG0_0 0x18 |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 61 | #define KBC_TO_CNT_0 0x24 |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 62 | #define KBC_INIT_DLY_0 0x28 |
| 63 | #define KBC_RPT_DLY_0 0x2c |
| 64 | #define KBC_KP_ENT0_0 0x30 |
| 65 | #define KBC_KP_ENT1_0 0x34 |
| 66 | #define KBC_ROW0_MASK_0 0x38 |
| 67 | |
| 68 | #define KBC_ROW_SHIFT 3 |
| 69 | |
| 70 | struct tegra_kbc { |
| 71 | void __iomem *mmio; |
| 72 | struct input_dev *idev; |
| 73 | unsigned int irq; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 74 | spinlock_t lock; |
| 75 | unsigned int repoll_dly; |
| 76 | unsigned long cp_dly_jiffies; |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 77 | unsigned int cp_to_wkup_dly; |
Rakesh Iyer | 4e8b65f | 2011-02-18 08:38:02 -0800 | [diff] [blame] | 78 | bool use_fn_map; |
Rakesh Iyer | 34abeeb | 2011-04-27 23:18:15 -0700 | [diff] [blame] | 79 | bool use_ghost_filter; |
Rakesh Iyer | fd0fc21 | 2011-12-29 19:27:44 -0800 | [diff] [blame] | 80 | bool keypress_caused_wake; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 81 | const struct tegra_kbc_platform_data *pdata; |
Rakesh Iyer | 4e8b65f | 2011-02-18 08:38:02 -0800 | [diff] [blame] | 82 | unsigned short keycode[KBC_MAX_KEY * 2]; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 83 | unsigned short current_keys[KBC_MAX_KPENT]; |
| 84 | unsigned int num_pressed_keys; |
Rakesh Iyer | fd0fc21 | 2011-12-29 19:27:44 -0800 | [diff] [blame] | 85 | u32 wakeup_key; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 86 | struct timer_list timer; |
| 87 | struct clk *clk; |
| 88 | }; |
| 89 | |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 90 | static const u32 tegra_kbc_default_keymap[] __devinitdata = { |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 91 | KEY(0, 2, KEY_W), |
| 92 | KEY(0, 3, KEY_S), |
| 93 | KEY(0, 4, KEY_A), |
| 94 | KEY(0, 5, KEY_Z), |
| 95 | KEY(0, 7, KEY_FN), |
| 96 | |
Rakesh Iyer | e7acc84 | 2011-01-28 22:05:14 -0800 | [diff] [blame] | 97 | KEY(1, 7, KEY_LEFTMETA), |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 98 | |
| 99 | KEY(2, 6, KEY_RIGHTALT), |
| 100 | KEY(2, 7, KEY_LEFTALT), |
| 101 | |
| 102 | KEY(3, 0, KEY_5), |
| 103 | KEY(3, 1, KEY_4), |
| 104 | KEY(3, 2, KEY_R), |
| 105 | KEY(3, 3, KEY_E), |
| 106 | KEY(3, 4, KEY_F), |
| 107 | KEY(3, 5, KEY_D), |
| 108 | KEY(3, 6, KEY_X), |
| 109 | |
| 110 | KEY(4, 0, KEY_7), |
| 111 | KEY(4, 1, KEY_6), |
| 112 | KEY(4, 2, KEY_T), |
| 113 | KEY(4, 3, KEY_H), |
| 114 | KEY(4, 4, KEY_G), |
| 115 | KEY(4, 5, KEY_V), |
| 116 | KEY(4, 6, KEY_C), |
| 117 | KEY(4, 7, KEY_SPACE), |
| 118 | |
| 119 | KEY(5, 0, KEY_9), |
| 120 | KEY(5, 1, KEY_8), |
| 121 | KEY(5, 2, KEY_U), |
| 122 | KEY(5, 3, KEY_Y), |
| 123 | KEY(5, 4, KEY_J), |
| 124 | KEY(5, 5, KEY_N), |
| 125 | KEY(5, 6, KEY_B), |
| 126 | KEY(5, 7, KEY_BACKSLASH), |
| 127 | |
| 128 | KEY(6, 0, KEY_MINUS), |
| 129 | KEY(6, 1, KEY_0), |
| 130 | KEY(6, 2, KEY_O), |
| 131 | KEY(6, 3, KEY_I), |
| 132 | KEY(6, 4, KEY_L), |
| 133 | KEY(6, 5, KEY_K), |
| 134 | KEY(6, 6, KEY_COMMA), |
| 135 | KEY(6, 7, KEY_M), |
| 136 | |
| 137 | KEY(7, 1, KEY_EQUAL), |
| 138 | KEY(7, 2, KEY_RIGHTBRACE), |
| 139 | KEY(7, 3, KEY_ENTER), |
| 140 | KEY(7, 7, KEY_MENU), |
| 141 | |
| 142 | KEY(8, 4, KEY_RIGHTSHIFT), |
| 143 | KEY(8, 5, KEY_LEFTSHIFT), |
| 144 | |
| 145 | KEY(9, 5, KEY_RIGHTCTRL), |
| 146 | KEY(9, 7, KEY_LEFTCTRL), |
| 147 | |
| 148 | KEY(11, 0, KEY_LEFTBRACE), |
| 149 | KEY(11, 1, KEY_P), |
| 150 | KEY(11, 2, KEY_APOSTROPHE), |
| 151 | KEY(11, 3, KEY_SEMICOLON), |
| 152 | KEY(11, 4, KEY_SLASH), |
| 153 | KEY(11, 5, KEY_DOT), |
| 154 | |
| 155 | KEY(12, 0, KEY_F10), |
| 156 | KEY(12, 1, KEY_F9), |
| 157 | KEY(12, 2, KEY_BACKSPACE), |
| 158 | KEY(12, 3, KEY_3), |
| 159 | KEY(12, 4, KEY_2), |
| 160 | KEY(12, 5, KEY_UP), |
| 161 | KEY(12, 6, KEY_PRINT), |
| 162 | KEY(12, 7, KEY_PAUSE), |
| 163 | |
| 164 | KEY(13, 0, KEY_INSERT), |
| 165 | KEY(13, 1, KEY_DELETE), |
| 166 | KEY(13, 3, KEY_PAGEUP), |
| 167 | KEY(13, 4, KEY_PAGEDOWN), |
| 168 | KEY(13, 5, KEY_RIGHT), |
| 169 | KEY(13, 6, KEY_DOWN), |
| 170 | KEY(13, 7, KEY_LEFT), |
| 171 | |
| 172 | KEY(14, 0, KEY_F11), |
| 173 | KEY(14, 1, KEY_F12), |
| 174 | KEY(14, 2, KEY_F8), |
| 175 | KEY(14, 3, KEY_Q), |
| 176 | KEY(14, 4, KEY_F4), |
| 177 | KEY(14, 5, KEY_F3), |
| 178 | KEY(14, 6, KEY_1), |
| 179 | KEY(14, 7, KEY_F7), |
| 180 | |
| 181 | KEY(15, 0, KEY_ESC), |
| 182 | KEY(15, 1, KEY_GRAVE), |
| 183 | KEY(15, 2, KEY_F5), |
| 184 | KEY(15, 3, KEY_TAB), |
| 185 | KEY(15, 4, KEY_F1), |
| 186 | KEY(15, 5, KEY_F2), |
| 187 | KEY(15, 6, KEY_CAPSLOCK), |
| 188 | KEY(15, 7, KEY_F6), |
Rakesh Iyer | 4e8b65f | 2011-02-18 08:38:02 -0800 | [diff] [blame] | 189 | |
| 190 | /* Software Handled Function Keys */ |
| 191 | KEY(20, 0, KEY_KP7), |
| 192 | |
| 193 | KEY(21, 0, KEY_KP9), |
| 194 | KEY(21, 1, KEY_KP8), |
| 195 | KEY(21, 2, KEY_KP4), |
| 196 | KEY(21, 4, KEY_KP1), |
| 197 | |
| 198 | KEY(22, 1, KEY_KPSLASH), |
| 199 | KEY(22, 2, KEY_KP6), |
| 200 | KEY(22, 3, KEY_KP5), |
| 201 | KEY(22, 4, KEY_KP3), |
| 202 | KEY(22, 5, KEY_KP2), |
| 203 | KEY(22, 7, KEY_KP0), |
| 204 | |
| 205 | KEY(27, 1, KEY_KPASTERISK), |
| 206 | KEY(27, 3, KEY_KPMINUS), |
| 207 | KEY(27, 4, KEY_KPPLUS), |
| 208 | KEY(27, 5, KEY_KPDOT), |
| 209 | |
| 210 | KEY(28, 5, KEY_VOLUMEUP), |
| 211 | |
| 212 | KEY(29, 3, KEY_HOME), |
| 213 | KEY(29, 4, KEY_END), |
| 214 | KEY(29, 5, KEY_BRIGHTNESSDOWN), |
| 215 | KEY(29, 6, KEY_VOLUMEDOWN), |
| 216 | KEY(29, 7, KEY_BRIGHTNESSUP), |
| 217 | |
| 218 | KEY(30, 0, KEY_NUMLOCK), |
| 219 | KEY(30, 1, KEY_SCROLLLOCK), |
| 220 | KEY(30, 2, KEY_MUTE), |
| 221 | |
| 222 | KEY(31, 4, KEY_HELP), |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 223 | }; |
| 224 | |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 225 | static const |
| 226 | struct matrix_keymap_data tegra_kbc_default_keymap_data __devinitdata = { |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 227 | .keymap = tegra_kbc_default_keymap, |
| 228 | .keymap_size = ARRAY_SIZE(tegra_kbc_default_keymap), |
| 229 | }; |
| 230 | |
| 231 | static void tegra_kbc_report_released_keys(struct input_dev *input, |
| 232 | unsigned short old_keycodes[], |
| 233 | unsigned int old_num_keys, |
| 234 | unsigned short new_keycodes[], |
| 235 | unsigned int new_num_keys) |
| 236 | { |
| 237 | unsigned int i, j; |
| 238 | |
| 239 | for (i = 0; i < old_num_keys; i++) { |
| 240 | for (j = 0; j < new_num_keys; j++) |
| 241 | if (old_keycodes[i] == new_keycodes[j]) |
| 242 | break; |
| 243 | |
| 244 | if (j == new_num_keys) |
| 245 | input_report_key(input, old_keycodes[i], 0); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | static void tegra_kbc_report_pressed_keys(struct input_dev *input, |
| 250 | unsigned char scancodes[], |
| 251 | unsigned short keycodes[], |
| 252 | unsigned int num_pressed_keys) |
| 253 | { |
| 254 | unsigned int i; |
| 255 | |
| 256 | for (i = 0; i < num_pressed_keys; i++) { |
| 257 | input_event(input, EV_MSC, MSC_SCAN, scancodes[i]); |
| 258 | input_report_key(input, keycodes[i], 1); |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | static void tegra_kbc_report_keys(struct tegra_kbc *kbc) |
| 263 | { |
| 264 | unsigned char scancodes[KBC_MAX_KPENT]; |
| 265 | unsigned short keycodes[KBC_MAX_KPENT]; |
| 266 | u32 val = 0; |
| 267 | unsigned int i; |
| 268 | unsigned int num_down = 0; |
Rakesh Iyer | 4e8b65f | 2011-02-18 08:38:02 -0800 | [diff] [blame] | 269 | bool fn_keypress = false; |
Rakesh Iyer | 34abeeb | 2011-04-27 23:18:15 -0700 | [diff] [blame] | 270 | bool key_in_same_row = false; |
| 271 | bool key_in_same_col = false; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 272 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 273 | for (i = 0; i < KBC_MAX_KPENT; i++) { |
| 274 | if ((i % 4) == 0) |
| 275 | val = readl(kbc->mmio + KBC_KP_ENT0_0 + i); |
| 276 | |
| 277 | if (val & 0x80) { |
| 278 | unsigned int col = val & 0x07; |
| 279 | unsigned int row = (val >> 3) & 0x0f; |
| 280 | unsigned char scancode = |
| 281 | MATRIX_SCAN_CODE(row, col, KBC_ROW_SHIFT); |
| 282 | |
| 283 | scancodes[num_down] = scancode; |
Rakesh Iyer | 4e8b65f | 2011-02-18 08:38:02 -0800 | [diff] [blame] | 284 | keycodes[num_down] = kbc->keycode[scancode]; |
| 285 | /* If driver uses Fn map, do not report the Fn key. */ |
| 286 | if ((keycodes[num_down] == KEY_FN) && kbc->use_fn_map) |
| 287 | fn_keypress = true; |
| 288 | else |
| 289 | num_down++; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | val >>= 8; |
| 293 | } |
Rakesh Iyer | 4e8b65f | 2011-02-18 08:38:02 -0800 | [diff] [blame] | 294 | |
| 295 | /* |
Rakesh Iyer | 34abeeb | 2011-04-27 23:18:15 -0700 | [diff] [blame] | 296 | * Matrix keyboard designs are prone to keyboard ghosting. |
| 297 | * Ghosting occurs if there are 3 keys such that - |
| 298 | * any 2 of the 3 keys share a row, and any 2 of them share a column. |
| 299 | * If so ignore the key presses for this iteration. |
| 300 | */ |
Dmitry Torokhov | 95439cb | 2011-09-09 09:24:20 -0700 | [diff] [blame] | 301 | if (kbc->use_ghost_filter && num_down >= 3) { |
Rakesh Iyer | 34abeeb | 2011-04-27 23:18:15 -0700 | [diff] [blame] | 302 | for (i = 0; i < num_down; i++) { |
| 303 | unsigned int j; |
| 304 | u8 curr_col = scancodes[i] & 0x07; |
| 305 | u8 curr_row = scancodes[i] >> KBC_ROW_SHIFT; |
| 306 | |
| 307 | /* |
| 308 | * Find 2 keys such that one key is in the same row |
| 309 | * and the other is in the same column as the i-th key. |
| 310 | */ |
| 311 | for (j = i + 1; j < num_down; j++) { |
| 312 | u8 col = scancodes[j] & 0x07; |
| 313 | u8 row = scancodes[j] >> KBC_ROW_SHIFT; |
| 314 | |
| 315 | if (col == curr_col) |
| 316 | key_in_same_col = true; |
| 317 | if (row == curr_row) |
| 318 | key_in_same_row = true; |
| 319 | } |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /* |
Rakesh Iyer | 4e8b65f | 2011-02-18 08:38:02 -0800 | [diff] [blame] | 324 | * If the platform uses Fn keymaps, translate keys on a Fn keypress. |
| 325 | * Function keycodes are KBC_MAX_KEY apart from the plain keycodes. |
| 326 | */ |
| 327 | if (fn_keypress) { |
| 328 | for (i = 0; i < num_down; i++) { |
| 329 | scancodes[i] += KBC_MAX_KEY; |
| 330 | keycodes[i] = kbc->keycode[scancodes[i]]; |
| 331 | } |
| 332 | } |
| 333 | |
Rakesh Iyer | 34abeeb | 2011-04-27 23:18:15 -0700 | [diff] [blame] | 334 | /* Ignore the key presses for this iteration? */ |
| 335 | if (key_in_same_col && key_in_same_row) |
| 336 | return; |
| 337 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 338 | tegra_kbc_report_released_keys(kbc->idev, |
| 339 | kbc->current_keys, kbc->num_pressed_keys, |
| 340 | keycodes, num_down); |
| 341 | tegra_kbc_report_pressed_keys(kbc->idev, scancodes, keycodes, num_down); |
| 342 | input_sync(kbc->idev); |
| 343 | |
| 344 | memcpy(kbc->current_keys, keycodes, sizeof(kbc->current_keys)); |
| 345 | kbc->num_pressed_keys = num_down; |
| 346 | } |
| 347 | |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 348 | static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable) |
| 349 | { |
| 350 | u32 val; |
| 351 | |
| 352 | val = readl(kbc->mmio + KBC_CONTROL_0); |
| 353 | if (enable) |
| 354 | val |= KBC_CONTROL_FIFO_CNT_INT_EN; |
| 355 | else |
| 356 | val &= ~KBC_CONTROL_FIFO_CNT_INT_EN; |
| 357 | writel(val, kbc->mmio + KBC_CONTROL_0); |
| 358 | } |
| 359 | |
Rakesh Iyer | b6834b0 | 2012-01-22 23:27:54 -0800 | [diff] [blame] | 360 | static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable) |
| 361 | { |
| 362 | u32 val; |
| 363 | |
| 364 | val = readl(kbc->mmio + KBC_CONTROL_0); |
| 365 | if (enable) |
| 366 | val |= KBC_CONTROL_KEYPRESS_INT_EN; |
| 367 | else |
| 368 | val &= ~KBC_CONTROL_KEYPRESS_INT_EN; |
| 369 | writel(val, kbc->mmio + KBC_CONTROL_0); |
| 370 | } |
| 371 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 372 | static void tegra_kbc_keypress_timer(unsigned long data) |
| 373 | { |
| 374 | struct tegra_kbc *kbc = (struct tegra_kbc *)data; |
| 375 | unsigned long flags; |
| 376 | u32 val; |
| 377 | unsigned int i; |
| 378 | |
Dmitry Torokhov | 95439cb | 2011-09-09 09:24:20 -0700 | [diff] [blame] | 379 | spin_lock_irqsave(&kbc->lock, flags); |
| 380 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 381 | val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf; |
| 382 | if (val) { |
| 383 | unsigned long dly; |
| 384 | |
| 385 | tegra_kbc_report_keys(kbc); |
| 386 | |
| 387 | /* |
| 388 | * If more than one keys are pressed we need not wait |
| 389 | * for the repoll delay. |
| 390 | */ |
| 391 | dly = (val == 1) ? kbc->repoll_dly : 1; |
| 392 | mod_timer(&kbc->timer, jiffies + msecs_to_jiffies(dly)); |
| 393 | } else { |
| 394 | /* Release any pressed keys and exit the polling loop */ |
| 395 | for (i = 0; i < kbc->num_pressed_keys; i++) |
| 396 | input_report_key(kbc->idev, kbc->current_keys[i], 0); |
| 397 | input_sync(kbc->idev); |
| 398 | |
| 399 | kbc->num_pressed_keys = 0; |
| 400 | |
| 401 | /* All keys are released so enable the keypress interrupt */ |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 402 | tegra_kbc_set_fifo_interrupt(kbc, true); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 403 | } |
Dmitry Torokhov | 95439cb | 2011-09-09 09:24:20 -0700 | [diff] [blame] | 404 | |
| 405 | spin_unlock_irqrestore(&kbc->lock, flags); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | static irqreturn_t tegra_kbc_isr(int irq, void *args) |
| 409 | { |
| 410 | struct tegra_kbc *kbc = args; |
Dmitry Torokhov | 95439cb | 2011-09-09 09:24:20 -0700 | [diff] [blame] | 411 | unsigned long flags; |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 412 | u32 val; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 413 | |
Dmitry Torokhov | 95439cb | 2011-09-09 09:24:20 -0700 | [diff] [blame] | 414 | spin_lock_irqsave(&kbc->lock, flags); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 415 | |
| 416 | /* |
| 417 | * Quickly bail out & reenable interrupts if the fifo threshold |
| 418 | * count interrupt wasn't the interrupt source |
| 419 | */ |
| 420 | val = readl(kbc->mmio + KBC_INT_0); |
| 421 | writel(val, kbc->mmio + KBC_INT_0); |
| 422 | |
| 423 | if (val & KBC_INT_FIFO_CNT_INT_STATUS) { |
| 424 | /* |
Dmitry Torokhov | 95439cb | 2011-09-09 09:24:20 -0700 | [diff] [blame] | 425 | * Until all keys are released, defer further processing to |
| 426 | * the polling loop in tegra_kbc_keypress_timer. |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 427 | */ |
Dmitry Torokhov | 95439cb | 2011-09-09 09:24:20 -0700 | [diff] [blame] | 428 | tegra_kbc_set_fifo_interrupt(kbc, false); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 429 | mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies); |
Rakesh Iyer | fd0fc21 | 2011-12-29 19:27:44 -0800 | [diff] [blame] | 430 | } else if (val & KBC_INT_KEYPRESS_INT_STATUS) { |
| 431 | /* We can be here only through system resume path */ |
| 432 | kbc->keypress_caused_wake = true; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 433 | } |
| 434 | |
Dmitry Torokhov | 95439cb | 2011-09-09 09:24:20 -0700 | [diff] [blame] | 435 | spin_unlock_irqrestore(&kbc->lock, flags); |
| 436 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 437 | return IRQ_HANDLED; |
| 438 | } |
| 439 | |
| 440 | static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter) |
| 441 | { |
| 442 | const struct tegra_kbc_platform_data *pdata = kbc->pdata; |
| 443 | int i; |
| 444 | unsigned int rst_val; |
| 445 | |
Rakesh Iyer | baafb43 | 2011-05-11 14:24:10 -0700 | [diff] [blame] | 446 | /* Either mask all keys or none. */ |
| 447 | rst_val = (filter && !pdata->wakeup) ? ~0 : 0; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 448 | |
| 449 | for (i = 0; i < KBC_MAX_ROW; i++) |
| 450 | writel(rst_val, kbc->mmio + KBC_ROW0_MASK_0 + i * 4); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | static void tegra_kbc_config_pins(struct tegra_kbc *kbc) |
| 454 | { |
| 455 | const struct tegra_kbc_platform_data *pdata = kbc->pdata; |
| 456 | int i; |
| 457 | |
| 458 | for (i = 0; i < KBC_MAX_GPIO; i++) { |
| 459 | u32 r_shft = 5 * (i % 6); |
| 460 | u32 c_shft = 4 * (i % 8); |
Rakesh Iyer | 7530c4a | 2011-01-28 22:05:14 -0800 | [diff] [blame] | 461 | u32 r_mask = 0x1f << r_shft; |
| 462 | u32 c_mask = 0x0f << c_shft; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 463 | u32 r_offs = (i / 6) * 4 + KBC_ROW_CFG0_0; |
| 464 | u32 c_offs = (i / 8) * 4 + KBC_COL_CFG0_0; |
| 465 | u32 row_cfg = readl(kbc->mmio + r_offs); |
| 466 | u32 col_cfg = readl(kbc->mmio + c_offs); |
| 467 | |
| 468 | row_cfg &= ~r_mask; |
| 469 | col_cfg &= ~c_mask; |
| 470 | |
Shridhar Rasal | 023cea0 | 2012-02-03 00:27:30 -0800 | [diff] [blame] | 471 | switch (pdata->pin_cfg[i].type) { |
| 472 | case PIN_CFG_ROW: |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 473 | row_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << r_shft; |
Shridhar Rasal | 023cea0 | 2012-02-03 00:27:30 -0800 | [diff] [blame] | 474 | break; |
| 475 | |
| 476 | case PIN_CFG_COL: |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 477 | col_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << c_shft; |
Shridhar Rasal | 023cea0 | 2012-02-03 00:27:30 -0800 | [diff] [blame] | 478 | break; |
| 479 | |
| 480 | case PIN_CFG_IGNORE: |
| 481 | break; |
| 482 | } |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 483 | |
| 484 | writel(row_cfg, kbc->mmio + r_offs); |
| 485 | writel(col_cfg, kbc->mmio + c_offs); |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | static int tegra_kbc_start(struct tegra_kbc *kbc) |
| 490 | { |
| 491 | const struct tegra_kbc_platform_data *pdata = kbc->pdata; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 492 | unsigned int debounce_cnt; |
| 493 | u32 val = 0; |
| 494 | |
Prashant Gaikwad | f762470 | 2012-06-05 09:59:39 +0530 | [diff] [blame] | 495 | clk_prepare_enable(kbc->clk); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 496 | |
| 497 | /* Reset the KBC controller to clear all previous status.*/ |
| 498 | tegra_periph_reset_assert(kbc->clk); |
| 499 | udelay(100); |
| 500 | tegra_periph_reset_deassert(kbc->clk); |
| 501 | udelay(100); |
| 502 | |
| 503 | tegra_kbc_config_pins(kbc); |
| 504 | tegra_kbc_setup_wakekeys(kbc, false); |
| 505 | |
| 506 | writel(pdata->repeat_cnt, kbc->mmio + KBC_RPT_DLY_0); |
| 507 | |
| 508 | /* Keyboard debounce count is maximum of 12 bits. */ |
| 509 | debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT); |
| 510 | val = KBC_DEBOUNCE_CNT_SHIFT(debounce_cnt); |
| 511 | val |= KBC_FIFO_TH_CNT_SHIFT(1); /* set fifo interrupt threshold to 1 */ |
| 512 | val |= KBC_CONTROL_FIFO_CNT_INT_EN; /* interrupt on FIFO threshold */ |
| 513 | val |= KBC_CONTROL_KBC_EN; /* enable */ |
| 514 | writel(val, kbc->mmio + KBC_CONTROL_0); |
| 515 | |
| 516 | /* |
| 517 | * Compute the delay(ns) from interrupt mode to continuous polling |
| 518 | * mode so the timer routine is scheduled appropriately. |
| 519 | */ |
| 520 | val = readl(kbc->mmio + KBC_INIT_DLY_0); |
| 521 | kbc->cp_dly_jiffies = usecs_to_jiffies((val & 0xfffff) * 32); |
| 522 | |
| 523 | kbc->num_pressed_keys = 0; |
| 524 | |
| 525 | /* |
| 526 | * Atomically clear out any remaining entries in the key FIFO |
| 527 | * and enable keyboard interrupts. |
| 528 | */ |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 529 | while (1) { |
| 530 | val = readl(kbc->mmio + KBC_INT_0); |
| 531 | val >>= 4; |
| 532 | if (!val) |
| 533 | break; |
| 534 | |
| 535 | val = readl(kbc->mmio + KBC_KP_ENT0_0); |
| 536 | val = readl(kbc->mmio + KBC_KP_ENT1_0); |
| 537 | } |
| 538 | writel(0x7, kbc->mmio + KBC_INT_0); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 539 | |
| 540 | enable_irq(kbc->irq); |
| 541 | |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | static void tegra_kbc_stop(struct tegra_kbc *kbc) |
| 546 | { |
| 547 | unsigned long flags; |
| 548 | u32 val; |
| 549 | |
| 550 | spin_lock_irqsave(&kbc->lock, flags); |
| 551 | val = readl(kbc->mmio + KBC_CONTROL_0); |
| 552 | val &= ~1; |
| 553 | writel(val, kbc->mmio + KBC_CONTROL_0); |
| 554 | spin_unlock_irqrestore(&kbc->lock, flags); |
| 555 | |
| 556 | disable_irq(kbc->irq); |
| 557 | del_timer_sync(&kbc->timer); |
| 558 | |
Prashant Gaikwad | f762470 | 2012-06-05 09:59:39 +0530 | [diff] [blame] | 559 | clk_disable_unprepare(kbc->clk); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | static int tegra_kbc_open(struct input_dev *dev) |
| 563 | { |
| 564 | struct tegra_kbc *kbc = input_get_drvdata(dev); |
| 565 | |
| 566 | return tegra_kbc_start(kbc); |
| 567 | } |
| 568 | |
| 569 | static void tegra_kbc_close(struct input_dev *dev) |
| 570 | { |
| 571 | struct tegra_kbc *kbc = input_get_drvdata(dev); |
| 572 | |
| 573 | return tegra_kbc_stop(kbc); |
| 574 | } |
| 575 | |
| 576 | static bool __devinit |
| 577 | tegra_kbc_check_pin_cfg(const struct tegra_kbc_platform_data *pdata, |
| 578 | struct device *dev, unsigned int *num_rows) |
| 579 | { |
| 580 | int i; |
| 581 | |
| 582 | *num_rows = 0; |
| 583 | |
| 584 | for (i = 0; i < KBC_MAX_GPIO; i++) { |
| 585 | const struct tegra_kbc_pin_cfg *pin_cfg = &pdata->pin_cfg[i]; |
| 586 | |
Shridhar Rasal | 023cea0 | 2012-02-03 00:27:30 -0800 | [diff] [blame] | 587 | switch (pin_cfg->type) { |
| 588 | case PIN_CFG_ROW: |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 589 | if (pin_cfg->num >= KBC_MAX_ROW) { |
| 590 | dev_err(dev, |
| 591 | "pin_cfg[%d]: invalid row number %d\n", |
| 592 | i, pin_cfg->num); |
| 593 | return false; |
| 594 | } |
| 595 | (*num_rows)++; |
Shridhar Rasal | 023cea0 | 2012-02-03 00:27:30 -0800 | [diff] [blame] | 596 | break; |
| 597 | |
| 598 | case PIN_CFG_COL: |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 599 | if (pin_cfg->num >= KBC_MAX_COL) { |
| 600 | dev_err(dev, |
| 601 | "pin_cfg[%d]: invalid column number %d\n", |
| 602 | i, pin_cfg->num); |
| 603 | return false; |
| 604 | } |
Shridhar Rasal | 023cea0 | 2012-02-03 00:27:30 -0800 | [diff] [blame] | 605 | break; |
| 606 | |
| 607 | case PIN_CFG_IGNORE: |
| 608 | break; |
| 609 | |
| 610 | default: |
| 611 | dev_err(dev, |
| 612 | "pin_cfg[%d]: invalid entry type %d\n", |
| 613 | pin_cfg->type, pin_cfg->num); |
| 614 | return false; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 615 | } |
| 616 | } |
| 617 | |
| 618 | return true; |
| 619 | } |
| 620 | |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 621 | #ifdef CONFIG_OF |
Dmitry Torokhov | b45c8f3 | 2012-05-10 22:37:15 -0700 | [diff] [blame] | 622 | static struct tegra_kbc_platform_data * __devinit tegra_kbc_dt_parse_pdata( |
| 623 | struct platform_device *pdev) |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 624 | { |
| 625 | struct tegra_kbc_platform_data *pdata; |
| 626 | struct device_node *np = pdev->dev.of_node; |
Olof Johansson | 145e973 | 2012-03-13 21:36:29 -0700 | [diff] [blame] | 627 | u32 prop; |
| 628 | int i; |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 629 | |
| 630 | if (!np) |
| 631 | return NULL; |
| 632 | |
Viresh Kumar | 131c713 | 2012-03-26 23:55:24 -0700 | [diff] [blame] | 633 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 634 | if (!pdata) |
| 635 | return NULL; |
| 636 | |
Olof Johansson | 145e973 | 2012-03-13 21:36:29 -0700 | [diff] [blame] | 637 | if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop)) |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 638 | pdata->debounce_cnt = prop; |
| 639 | |
Olof Johansson | 145e973 | 2012-03-13 21:36:29 -0700 | [diff] [blame] | 640 | if (!of_property_read_u32(np, "nvidia,repeat-delay-ms", &prop)) |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 641 | pdata->repeat_cnt = prop; |
| 642 | |
Olof Johansson | 145e973 | 2012-03-13 21:36:29 -0700 | [diff] [blame] | 643 | if (of_find_property(np, "nvidia,needs-ghost-filter", NULL)) |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 644 | pdata->use_ghost_filter = true; |
| 645 | |
Olof Johansson | 145e973 | 2012-03-13 21:36:29 -0700 | [diff] [blame] | 646 | if (of_find_property(np, "nvidia,wakeup-source", NULL)) |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 647 | pdata->wakeup = true; |
| 648 | |
| 649 | /* |
| 650 | * All currently known keymaps with device tree support use the same |
| 651 | * pin_cfg, so set it up here. |
| 652 | */ |
| 653 | for (i = 0; i < KBC_MAX_ROW; i++) { |
| 654 | pdata->pin_cfg[i].num = i; |
Shridhar Rasal | 023cea0 | 2012-02-03 00:27:30 -0800 | [diff] [blame] | 655 | pdata->pin_cfg[i].type = PIN_CFG_ROW; |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 656 | } |
| 657 | |
| 658 | for (i = 0; i < KBC_MAX_COL; i++) { |
| 659 | pdata->pin_cfg[KBC_MAX_ROW + i].num = i; |
Shridhar Rasal | 023cea0 | 2012-02-03 00:27:30 -0800 | [diff] [blame] | 660 | pdata->pin_cfg[KBC_MAX_ROW + i].type = PIN_CFG_COL; |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 661 | } |
| 662 | |
| 663 | return pdata; |
| 664 | } |
| 665 | #else |
| 666 | static inline struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata( |
| 667 | struct platform_device *pdev) |
| 668 | { |
| 669 | return NULL; |
| 670 | } |
| 671 | #endif |
| 672 | |
Dmitry Torokhov | b45c8f3 | 2012-05-10 22:37:15 -0700 | [diff] [blame] | 673 | static int __devinit tegra_kbd_setup_keymap(struct tegra_kbc *kbc) |
| 674 | { |
| 675 | const struct tegra_kbc_platform_data *pdata = kbc->pdata; |
| 676 | const struct matrix_keymap_data *keymap_data = pdata->keymap_data; |
| 677 | unsigned int keymap_rows = KBC_MAX_KEY; |
| 678 | int retval; |
| 679 | |
| 680 | if (keymap_data && pdata->use_fn_map) |
| 681 | keymap_rows *= 2; |
| 682 | |
| 683 | retval = matrix_keypad_build_keymap(keymap_data, NULL, |
| 684 | keymap_rows, KBC_MAX_COL, |
| 685 | kbc->keycode, kbc->idev); |
| 686 | if (retval == -ENOSYS || retval == -ENOENT) { |
| 687 | /* |
| 688 | * If there is no OF support in kernel or keymap |
| 689 | * property is missing, use default keymap. |
| 690 | */ |
| 691 | retval = matrix_keypad_build_keymap( |
| 692 | &tegra_kbc_default_keymap_data, NULL, |
| 693 | keymap_rows, KBC_MAX_COL, |
| 694 | kbc->keycode, kbc->idev); |
| 695 | } |
| 696 | |
| 697 | return retval; |
| 698 | } |
| 699 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 700 | static int __devinit tegra_kbc_probe(struct platform_device *pdev) |
| 701 | { |
| 702 | const struct tegra_kbc_platform_data *pdata = pdev->dev.platform_data; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 703 | struct tegra_kbc *kbc; |
| 704 | struct input_dev *input_dev; |
| 705 | struct resource *res; |
| 706 | int irq; |
| 707 | int err; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 708 | int num_rows = 0; |
| 709 | unsigned int debounce_cnt; |
| 710 | unsigned int scan_time_rows; |
| 711 | |
| 712 | if (!pdata) |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 713 | pdata = tegra_kbc_dt_parse_pdata(pdev); |
| 714 | |
| 715 | if (!pdata) |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 716 | return -EINVAL; |
| 717 | |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 718 | if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows)) { |
| 719 | err = -EINVAL; |
| 720 | goto err_free_pdata; |
| 721 | } |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 722 | |
| 723 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 724 | if (!res) { |
| 725 | dev_err(&pdev->dev, "failed to get I/O memory\n"); |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 726 | err = -ENXIO; |
| 727 | goto err_free_pdata; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | irq = platform_get_irq(pdev, 0); |
| 731 | if (irq < 0) { |
| 732 | dev_err(&pdev->dev, "failed to get keyboard IRQ\n"); |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 733 | err = -ENXIO; |
| 734 | goto err_free_pdata; |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 735 | } |
| 736 | |
| 737 | kbc = kzalloc(sizeof(*kbc), GFP_KERNEL); |
| 738 | input_dev = input_allocate_device(); |
| 739 | if (!kbc || !input_dev) { |
| 740 | err = -ENOMEM; |
| 741 | goto err_free_mem; |
| 742 | } |
| 743 | |
| 744 | kbc->pdata = pdata; |
| 745 | kbc->idev = input_dev; |
| 746 | kbc->irq = irq; |
| 747 | spin_lock_init(&kbc->lock); |
| 748 | setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc); |
| 749 | |
| 750 | res = request_mem_region(res->start, resource_size(res), pdev->name); |
| 751 | if (!res) { |
| 752 | dev_err(&pdev->dev, "failed to request I/O memory\n"); |
| 753 | err = -EBUSY; |
| 754 | goto err_free_mem; |
| 755 | } |
| 756 | |
| 757 | kbc->mmio = ioremap(res->start, resource_size(res)); |
| 758 | if (!kbc->mmio) { |
| 759 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); |
| 760 | err = -ENXIO; |
| 761 | goto err_free_mem_region; |
| 762 | } |
| 763 | |
| 764 | kbc->clk = clk_get(&pdev->dev, NULL); |
| 765 | if (IS_ERR(kbc->clk)) { |
| 766 | dev_err(&pdev->dev, "failed to get keyboard clock\n"); |
| 767 | err = PTR_ERR(kbc->clk); |
| 768 | goto err_iounmap; |
| 769 | } |
| 770 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 771 | /* |
| 772 | * The time delay between two consecutive reads of the FIFO is |
| 773 | * the sum of the repeat time and the time taken for scanning |
| 774 | * the rows. There is an additional delay before the row scanning |
| 775 | * starts. The repoll delay is computed in milliseconds. |
| 776 | */ |
| 777 | debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT); |
| 778 | scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows; |
| 779 | kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + pdata->repeat_cnt; |
Rakesh Iyer | 3f27757 | 2011-07-30 12:01:48 -0700 | [diff] [blame] | 780 | kbc->repoll_dly = DIV_ROUND_UP(kbc->repoll_dly, KBC_CYCLE_MS); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 781 | |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 782 | kbc->wakeup_key = pdata->wakeup_key; |
| 783 | kbc->use_fn_map = pdata->use_fn_map; |
| 784 | kbc->use_ghost_filter = pdata->use_ghost_filter; |
| 785 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 786 | input_dev->name = pdev->name; |
| 787 | input_dev->id.bustype = BUS_HOST; |
| 788 | input_dev->dev.parent = &pdev->dev; |
| 789 | input_dev->open = tegra_kbc_open; |
| 790 | input_dev->close = tegra_kbc_close; |
| 791 | |
Dmitry Torokhov | b45c8f3 | 2012-05-10 22:37:15 -0700 | [diff] [blame] | 792 | err = tegra_kbd_setup_keymap(kbc); |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 793 | if (err) { |
Dmitry Torokhov | b45c8f3 | 2012-05-10 22:37:15 -0700 | [diff] [blame] | 794 | dev_err(&pdev->dev, "failed to setup keymap\n"); |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 795 | goto err_put_clk; |
| 796 | } |
| 797 | |
| 798 | __set_bit(EV_REP, input_dev->evbit); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 799 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
| 800 | |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 801 | input_set_drvdata(input_dev, kbc); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 802 | |
Rakesh Iyer | fd0fc21 | 2011-12-29 19:27:44 -0800 | [diff] [blame] | 803 | err = request_irq(kbc->irq, tegra_kbc_isr, |
| 804 | IRQF_NO_SUSPEND | IRQF_TRIGGER_HIGH, pdev->name, kbc); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 805 | if (err) { |
| 806 | dev_err(&pdev->dev, "failed to request keyboard IRQ\n"); |
| 807 | goto err_put_clk; |
| 808 | } |
| 809 | |
| 810 | disable_irq(kbc->irq); |
| 811 | |
| 812 | err = input_register_device(kbc->idev); |
| 813 | if (err) { |
| 814 | dev_err(&pdev->dev, "failed to register input device\n"); |
| 815 | goto err_free_irq; |
| 816 | } |
| 817 | |
| 818 | platform_set_drvdata(pdev, kbc); |
| 819 | device_init_wakeup(&pdev->dev, pdata->wakeup); |
| 820 | |
| 821 | return 0; |
| 822 | |
| 823 | err_free_irq: |
| 824 | free_irq(kbc->irq, pdev); |
| 825 | err_put_clk: |
| 826 | clk_put(kbc->clk); |
| 827 | err_iounmap: |
| 828 | iounmap(kbc->mmio); |
| 829 | err_free_mem_region: |
| 830 | release_mem_region(res->start, resource_size(res)); |
| 831 | err_free_mem: |
Axel Lin | 22f8320 | 2011-08-11 09:22:45 -0700 | [diff] [blame] | 832 | input_free_device(input_dev); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 833 | kfree(kbc); |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 834 | err_free_pdata: |
Dmitry Torokhov | b45c8f3 | 2012-05-10 22:37:15 -0700 | [diff] [blame] | 835 | if (!pdev->dev.platform_data) |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 836 | kfree(pdata); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 837 | |
| 838 | return err; |
| 839 | } |
| 840 | |
| 841 | static int __devexit tegra_kbc_remove(struct platform_device *pdev) |
| 842 | { |
| 843 | struct tegra_kbc *kbc = platform_get_drvdata(pdev); |
| 844 | struct resource *res; |
| 845 | |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 846 | platform_set_drvdata(pdev, NULL); |
| 847 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 848 | free_irq(kbc->irq, pdev); |
| 849 | clk_put(kbc->clk); |
| 850 | |
| 851 | input_unregister_device(kbc->idev); |
| 852 | iounmap(kbc->mmio); |
| 853 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 854 | release_mem_region(res->start, resource_size(res)); |
| 855 | |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 856 | /* |
| 857 | * If we do not have platform data attached to the device we |
| 858 | * allocated it ourselves and thus need to free it. |
| 859 | */ |
| 860 | if (!pdev->dev.platform_data) |
| 861 | kfree(kbc->pdata); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 862 | |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 863 | kfree(kbc); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 864 | |
| 865 | return 0; |
| 866 | } |
| 867 | |
| 868 | #ifdef CONFIG_PM_SLEEP |
| 869 | static int tegra_kbc_suspend(struct device *dev) |
| 870 | { |
| 871 | struct platform_device *pdev = to_platform_device(dev); |
| 872 | struct tegra_kbc *kbc = platform_get_drvdata(pdev); |
| 873 | |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 874 | mutex_lock(&kbc->idev->mutex); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 875 | if (device_may_wakeup(&pdev->dev)) { |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 876 | disable_irq(kbc->irq); |
| 877 | del_timer_sync(&kbc->timer); |
| 878 | tegra_kbc_set_fifo_interrupt(kbc, false); |
| 879 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 880 | /* Forcefully clear the interrupt status */ |
| 881 | writel(0x7, kbc->mmio + KBC_INT_0); |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 882 | /* |
| 883 | * Store the previous resident time of continuous polling mode. |
| 884 | * Force the keyboard into interrupt mode. |
| 885 | */ |
| 886 | kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0); |
| 887 | writel(0, kbc->mmio + KBC_TO_CNT_0); |
| 888 | |
| 889 | tegra_kbc_setup_wakekeys(kbc, true); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 890 | msleep(30); |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 891 | |
Rakesh Iyer | fd0fc21 | 2011-12-29 19:27:44 -0800 | [diff] [blame] | 892 | kbc->keypress_caused_wake = false; |
Rakesh Iyer | b6834b0 | 2012-01-22 23:27:54 -0800 | [diff] [blame] | 893 | /* Enable keypress interrupt before going into suspend. */ |
| 894 | tegra_kbc_set_keypress_interrupt(kbc, true); |
Rakesh Iyer | fd0fc21 | 2011-12-29 19:27:44 -0800 | [diff] [blame] | 895 | enable_irq(kbc->irq); |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 896 | enable_irq_wake(kbc->irq); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 897 | } else { |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 898 | if (kbc->idev->users) |
| 899 | tegra_kbc_stop(kbc); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 900 | } |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 901 | mutex_unlock(&kbc->idev->mutex); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 902 | |
| 903 | return 0; |
| 904 | } |
| 905 | |
| 906 | static int tegra_kbc_resume(struct device *dev) |
| 907 | { |
| 908 | struct platform_device *pdev = to_platform_device(dev); |
| 909 | struct tegra_kbc *kbc = platform_get_drvdata(pdev); |
| 910 | int err = 0; |
| 911 | |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 912 | mutex_lock(&kbc->idev->mutex); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 913 | if (device_may_wakeup(&pdev->dev)) { |
| 914 | disable_irq_wake(kbc->irq); |
| 915 | tegra_kbc_setup_wakekeys(kbc, false); |
Rakesh Iyer | b6834b0 | 2012-01-22 23:27:54 -0800 | [diff] [blame] | 916 | /* We will use fifo interrupts for key detection. */ |
| 917 | tegra_kbc_set_keypress_interrupt(kbc, false); |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 918 | |
| 919 | /* Restore the resident time of continuous polling mode. */ |
| 920 | writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0); |
| 921 | |
| 922 | tegra_kbc_set_fifo_interrupt(kbc, true); |
| 923 | |
Rakesh Iyer | fd0fc21 | 2011-12-29 19:27:44 -0800 | [diff] [blame] | 924 | if (kbc->keypress_caused_wake && kbc->wakeup_key) { |
| 925 | /* |
| 926 | * We can't report events directly from the ISR |
| 927 | * because timekeeping is stopped when processing |
| 928 | * wakeup request and we get a nasty warning when |
| 929 | * we try to call do_gettimeofday() in evdev |
| 930 | * handler. |
| 931 | */ |
| 932 | input_report_key(kbc->idev, kbc->wakeup_key, 1); |
| 933 | input_sync(kbc->idev); |
| 934 | input_report_key(kbc->idev, kbc->wakeup_key, 0); |
| 935 | input_sync(kbc->idev); |
| 936 | } |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 937 | } else { |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 938 | if (kbc->idev->users) |
| 939 | err = tegra_kbc_start(kbc); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 940 | } |
Rakesh Iyer | d0d150e | 2011-09-08 15:34:11 -0700 | [diff] [blame] | 941 | mutex_unlock(&kbc->idev->mutex); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 942 | |
| 943 | return err; |
| 944 | } |
| 945 | #endif |
| 946 | |
| 947 | static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume); |
| 948 | |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 949 | static const struct of_device_id tegra_kbc_of_match[] = { |
| 950 | { .compatible = "nvidia,tegra20-kbc", }, |
| 951 | { }, |
| 952 | }; |
| 953 | MODULE_DEVICE_TABLE(of, tegra_kbc_of_match); |
| 954 | |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 955 | static struct platform_driver tegra_kbc_driver = { |
| 956 | .probe = tegra_kbc_probe, |
| 957 | .remove = __devexit_p(tegra_kbc_remove), |
| 958 | .driver = { |
| 959 | .name = "tegra-kbc", |
| 960 | .owner = THIS_MODULE, |
| 961 | .pm = &tegra_kbc_pm_ops, |
Olof Johansson | a445c7f | 2011-12-29 09:58:16 -0800 | [diff] [blame] | 962 | .of_match_table = tegra_kbc_of_match, |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 963 | }, |
| 964 | }; |
JJ Ding | 5146c84 | 2011-11-29 11:08:39 -0800 | [diff] [blame] | 965 | module_platform_driver(tegra_kbc_driver); |
Rakesh Iyer | 11f5b30 | 2011-01-19 23:38:47 -0800 | [diff] [blame] | 966 | |
| 967 | MODULE_LICENSE("GPL"); |
| 968 | MODULE_AUTHOR("Rakesh Iyer <riyer@nvidia.com>"); |
| 969 | MODULE_DESCRIPTION("Tegra matrix keyboard controller driver"); |
| 970 | MODULE_ALIAS("platform:tegra-kbc"); |