Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Texas Instruments TNETV107X Keypad Driver |
| 3 | * |
| 4 | * Copyright (C) 2010 Texas Instruments |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation version 2. |
| 9 | * |
| 10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 11 | * kind, whether express or implied; without even the implied warranty |
| 12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
Jamie Iles | a064092 | 2011-01-17 20:40:32 -0800 | [diff] [blame] | 17 | #include <linux/err.h> |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 18 | #include <linux/errno.h> |
| 19 | #include <linux/input.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/io.h> |
| 25 | #include <linux/clk.h> |
| 26 | #include <linux/input/matrix_keypad.h> |
Paul Gortmaker | d2d8442 | 2011-07-03 13:53:48 -0400 | [diff] [blame] | 27 | #include <linux/module.h> |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 28 | |
| 29 | #define BITS(x) (BIT(x) - 1) |
| 30 | |
| 31 | #define KEYPAD_ROWS 9 |
| 32 | #define KEYPAD_COLS 9 |
| 33 | |
| 34 | #define DEBOUNCE_MIN 0x400ul |
| 35 | #define DEBOUNCE_MAX 0x3ffffffful |
| 36 | |
| 37 | struct keypad_regs { |
| 38 | u32 rev; |
| 39 | u32 mode; |
| 40 | u32 mask; |
| 41 | u32 pol; |
| 42 | u32 dclock; |
| 43 | u32 rclock; |
| 44 | u32 stable_cnt; |
| 45 | u32 in_en; |
| 46 | u32 out; |
| 47 | u32 out_en; |
| 48 | u32 in; |
| 49 | u32 lock; |
| 50 | u32 pres[3]; |
| 51 | }; |
| 52 | |
| 53 | #define keypad_read(kp, reg) __raw_readl(&(kp)->regs->reg) |
| 54 | #define keypad_write(kp, reg, val) __raw_writel(val, &(kp)->regs->reg) |
| 55 | |
| 56 | struct keypad_data { |
| 57 | struct input_dev *input_dev; |
| 58 | struct resource *res; |
| 59 | struct keypad_regs __iomem *regs; |
| 60 | struct clk *clk; |
| 61 | struct device *dev; |
| 62 | spinlock_t lock; |
| 63 | u32 irq_press; |
| 64 | u32 irq_release; |
| 65 | int rows, cols, row_shift; |
| 66 | int debounce_ms, active_low; |
| 67 | u32 prev_keys[3]; |
| 68 | unsigned short keycodes[]; |
| 69 | }; |
| 70 | |
| 71 | static irqreturn_t keypad_irq(int irq, void *data) |
| 72 | { |
| 73 | struct keypad_data *kp = data; |
| 74 | int i, bit, val, row, col, code; |
| 75 | unsigned long flags; |
| 76 | u32 curr_keys[3]; |
| 77 | u32 change; |
| 78 | |
| 79 | spin_lock_irqsave(&kp->lock, flags); |
| 80 | |
| 81 | memset(curr_keys, 0, sizeof(curr_keys)); |
| 82 | if (irq == kp->irq_press) |
| 83 | for (i = 0; i < 3; i++) |
| 84 | curr_keys[i] = keypad_read(kp, pres[i]); |
| 85 | |
| 86 | for (i = 0; i < 3; i++) { |
| 87 | change = curr_keys[i] ^ kp->prev_keys[i]; |
| 88 | |
| 89 | while (change) { |
| 90 | bit = fls(change) - 1; |
| 91 | change ^= BIT(bit); |
| 92 | val = curr_keys[i] & BIT(bit); |
| 93 | bit += i * 32; |
| 94 | row = bit / KEYPAD_COLS; |
| 95 | col = bit % KEYPAD_COLS; |
| 96 | |
| 97 | code = MATRIX_SCAN_CODE(row, col, kp->row_shift); |
| 98 | input_event(kp->input_dev, EV_MSC, MSC_SCAN, code); |
| 99 | input_report_key(kp->input_dev, kp->keycodes[code], |
| 100 | val); |
| 101 | } |
| 102 | } |
| 103 | input_sync(kp->input_dev); |
| 104 | memcpy(kp->prev_keys, curr_keys, sizeof(curr_keys)); |
| 105 | |
| 106 | if (irq == kp->irq_press) |
| 107 | keypad_write(kp, lock, 0); /* Allow hardware updates */ |
| 108 | |
| 109 | spin_unlock_irqrestore(&kp->lock, flags); |
| 110 | |
| 111 | return IRQ_HANDLED; |
| 112 | } |
| 113 | |
| 114 | static int keypad_start(struct input_dev *dev) |
| 115 | { |
| 116 | struct keypad_data *kp = input_get_drvdata(dev); |
| 117 | unsigned long mask, debounce, clk_rate_khz; |
| 118 | unsigned long flags; |
| 119 | |
| 120 | clk_enable(kp->clk); |
| 121 | clk_rate_khz = clk_get_rate(kp->clk) / 1000; |
| 122 | |
| 123 | spin_lock_irqsave(&kp->lock, flags); |
| 124 | |
| 125 | /* Initialize device registers */ |
| 126 | keypad_write(kp, mode, 0); |
| 127 | |
| 128 | mask = BITS(kp->rows) << KEYPAD_COLS; |
| 129 | mask |= BITS(kp->cols); |
| 130 | keypad_write(kp, mask, ~mask); |
| 131 | |
| 132 | keypad_write(kp, pol, kp->active_low ? 0 : 0x3ffff); |
| 133 | keypad_write(kp, stable_cnt, 3); |
| 134 | |
| 135 | debounce = kp->debounce_ms * clk_rate_khz; |
| 136 | debounce = clamp(debounce, DEBOUNCE_MIN, DEBOUNCE_MAX); |
| 137 | keypad_write(kp, dclock, debounce); |
| 138 | keypad_write(kp, rclock, 4 * debounce); |
| 139 | |
| 140 | keypad_write(kp, in_en, 1); |
| 141 | |
| 142 | spin_unlock_irqrestore(&kp->lock, flags); |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static void keypad_stop(struct input_dev *dev) |
| 148 | { |
| 149 | struct keypad_data *kp = input_get_drvdata(dev); |
| 150 | |
| 151 | synchronize_irq(kp->irq_press); |
| 152 | synchronize_irq(kp->irq_release); |
| 153 | clk_disable(kp->clk); |
| 154 | } |
| 155 | |
| 156 | static int __devinit keypad_probe(struct platform_device *pdev) |
| 157 | { |
| 158 | const struct matrix_keypad_platform_data *pdata; |
| 159 | const struct matrix_keymap_data *keymap_data; |
| 160 | struct device *dev = &pdev->dev; |
| 161 | struct keypad_data *kp; |
| 162 | int error = 0, sz, row_shift; |
| 163 | u32 rev = 0; |
| 164 | |
| 165 | pdata = pdev->dev.platform_data; |
| 166 | if (!pdata) { |
| 167 | dev_err(dev, "cannot find device data\n"); |
| 168 | return -EINVAL; |
| 169 | } |
| 170 | |
| 171 | keymap_data = pdata->keymap_data; |
| 172 | if (!keymap_data) { |
| 173 | dev_err(dev, "cannot find keymap data\n"); |
| 174 | return -EINVAL; |
| 175 | } |
| 176 | |
| 177 | row_shift = get_count_order(pdata->num_col_gpios); |
| 178 | sz = offsetof(struct keypad_data, keycodes); |
| 179 | sz += (pdata->num_row_gpios << row_shift) * sizeof(kp->keycodes[0]); |
| 180 | kp = kzalloc(sz, GFP_KERNEL); |
| 181 | if (!kp) { |
| 182 | dev_err(dev, "cannot allocate device info\n"); |
| 183 | return -ENOMEM; |
| 184 | } |
| 185 | |
| 186 | kp->dev = dev; |
| 187 | kp->rows = pdata->num_row_gpios; |
| 188 | kp->cols = pdata->num_col_gpios; |
| 189 | kp->row_shift = row_shift; |
| 190 | platform_set_drvdata(pdev, kp); |
| 191 | spin_lock_init(&kp->lock); |
| 192 | |
| 193 | kp->irq_press = platform_get_irq_byname(pdev, "press"); |
| 194 | kp->irq_release = platform_get_irq_byname(pdev, "release"); |
| 195 | if (kp->irq_press < 0 || kp->irq_release < 0) { |
| 196 | dev_err(dev, "cannot determine device interrupts\n"); |
| 197 | error = -ENODEV; |
| 198 | goto error_res; |
| 199 | } |
| 200 | |
| 201 | kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 202 | if (!kp->res) { |
| 203 | dev_err(dev, "cannot determine register area\n"); |
| 204 | error = -ENODEV; |
| 205 | goto error_res; |
| 206 | } |
| 207 | |
| 208 | if (!request_mem_region(kp->res->start, resource_size(kp->res), |
| 209 | pdev->name)) { |
| 210 | dev_err(dev, "cannot claim register memory\n"); |
| 211 | kp->res = NULL; |
| 212 | error = -EINVAL; |
| 213 | goto error_res; |
| 214 | } |
| 215 | |
| 216 | kp->regs = ioremap(kp->res->start, resource_size(kp->res)); |
| 217 | if (!kp->regs) { |
| 218 | dev_err(dev, "cannot map register memory\n"); |
| 219 | error = -ENOMEM; |
| 220 | goto error_map; |
| 221 | } |
| 222 | |
| 223 | kp->clk = clk_get(dev, NULL); |
Jamie Iles | a064092 | 2011-01-17 20:40:32 -0800 | [diff] [blame] | 224 | if (IS_ERR(kp->clk)) { |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 225 | dev_err(dev, "cannot claim device clock\n"); |
Jamie Iles | a064092 | 2011-01-17 20:40:32 -0800 | [diff] [blame] | 226 | error = PTR_ERR(kp->clk); |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 227 | goto error_clk; |
| 228 | } |
| 229 | |
Lars-Peter Clausen | 9b7e31b | 2012-07-04 13:02:56 -0700 | [diff] [blame] | 230 | error = request_threaded_irq(kp->irq_press, NULL, keypad_irq, |
| 231 | IRQF_ONESHOT, dev_name(dev), kp); |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 232 | if (error < 0) { |
| 233 | dev_err(kp->dev, "Could not allocate keypad press key irq\n"); |
| 234 | goto error_irq_press; |
| 235 | } |
| 236 | |
Lars-Peter Clausen | 9b7e31b | 2012-07-04 13:02:56 -0700 | [diff] [blame] | 237 | error = request_threaded_irq(kp->irq_release, NULL, keypad_irq, |
| 238 | IRQF_ONESHOT, dev_name(dev), kp); |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 239 | if (error < 0) { |
| 240 | dev_err(kp->dev, "Could not allocate keypad release key irq\n"); |
| 241 | goto error_irq_release; |
| 242 | } |
| 243 | |
| 244 | kp->input_dev = input_allocate_device(); |
| 245 | if (!kp->input_dev) { |
| 246 | dev_err(dev, "cannot allocate input device\n"); |
| 247 | error = -ENOMEM; |
| 248 | goto error_input; |
| 249 | } |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 250 | |
| 251 | kp->input_dev->name = pdev->name; |
| 252 | kp->input_dev->dev.parent = &pdev->dev; |
| 253 | kp->input_dev->open = keypad_start; |
| 254 | kp->input_dev->close = keypad_stop; |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 255 | |
| 256 | clk_enable(kp->clk); |
| 257 | rev = keypad_read(kp, rev); |
| 258 | kp->input_dev->id.bustype = BUS_HOST; |
| 259 | kp->input_dev->id.product = ((rev >> 8) & 0x07); |
| 260 | kp->input_dev->id.version = ((rev >> 16) & 0xfff); |
| 261 | clk_disable(kp->clk); |
| 262 | |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 263 | error = matrix_keypad_build_keymap(keymap_data, NULL, |
| 264 | kp->rows, kp->cols, |
| 265 | kp->keycodes, kp->input_dev); |
| 266 | if (error) { |
| 267 | dev_err(dev, "Failed to build keymap\n"); |
| 268 | goto error_reg; |
| 269 | } |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 270 | |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 271 | if (!pdata->no_autorepeat) |
| 272 | kp->input_dev->evbit[0] |= BIT_MASK(EV_REP); |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 273 | input_set_capability(kp->input_dev, EV_MSC, MSC_SCAN); |
| 274 | |
Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame] | 275 | input_set_drvdata(kp->input_dev, kp); |
| 276 | |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 277 | error = input_register_device(kp->input_dev); |
| 278 | if (error < 0) { |
| 279 | dev_err(dev, "Could not register input device\n"); |
| 280 | goto error_reg; |
| 281 | } |
| 282 | |
| 283 | return 0; |
| 284 | |
| 285 | |
| 286 | error_reg: |
| 287 | input_free_device(kp->input_dev); |
| 288 | error_input: |
| 289 | free_irq(kp->irq_release, kp); |
| 290 | error_irq_release: |
| 291 | free_irq(kp->irq_press, kp); |
| 292 | error_irq_press: |
| 293 | clk_put(kp->clk); |
| 294 | error_clk: |
| 295 | iounmap(kp->regs); |
| 296 | error_map: |
| 297 | release_mem_region(kp->res->start, resource_size(kp->res)); |
| 298 | error_res: |
| 299 | platform_set_drvdata(pdev, NULL); |
| 300 | kfree(kp); |
| 301 | return error; |
| 302 | } |
| 303 | |
| 304 | static int __devexit keypad_remove(struct platform_device *pdev) |
| 305 | { |
| 306 | struct keypad_data *kp = platform_get_drvdata(pdev); |
| 307 | |
| 308 | free_irq(kp->irq_press, kp); |
| 309 | free_irq(kp->irq_release, kp); |
| 310 | input_unregister_device(kp->input_dev); |
| 311 | clk_put(kp->clk); |
| 312 | iounmap(kp->regs); |
| 313 | release_mem_region(kp->res->start, resource_size(kp->res)); |
| 314 | platform_set_drvdata(pdev, NULL); |
| 315 | kfree(kp); |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | static struct platform_driver keypad_driver = { |
| 321 | .probe = keypad_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame^] | 322 | .remove = keypad_remove, |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 323 | .driver.name = "tnetv107x-keypad", |
| 324 | .driver.owner = THIS_MODULE, |
| 325 | }; |
JJ Ding | 5146c84 | 2011-11-29 11:08:39 -0800 | [diff] [blame] | 326 | module_platform_driver(keypad_driver); |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 327 | |
| 328 | MODULE_AUTHOR("Cyril Chemparathy"); |
| 329 | MODULE_DESCRIPTION("TNETV107X Keypad Driver"); |
Axel Lin | 51a3db4 | 2011-06-27 12:38:43 -0700 | [diff] [blame] | 330 | MODULE_ALIAS("platform:tnetv107x-keypad"); |
Cyril Chemparathy | 7061408 | 2010-09-20 12:26:40 -0400 | [diff] [blame] | 331 | MODULE_LICENSE("GPL"); |