1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * linux/drivers/input/keyboard/omap-keypad.c 4 * 5 * OMAP Keypad Driver 6 * 7 * Copyright (C) 2003 Nokia Corporation 8 * Written by Timo Teräs <ext-timo.teras@nokia.com> 9 * 10 * Added support for H2 & H3 Keypad 11 * Copyright (C) 2004 Texas Instruments 12 */ 13 14 #include <linux/module.h> 15 #include <linux/interrupt.h> 16 #include <linux/types.h> 17 #include <linux/input.h> 18 #include <linux/kernel.h> 19 #include <linux/delay.h> 20 #include <linux/platform_device.h> 21 #include <linux/mutex.h> 22 #include <linux/errno.h> 23 #include <linux/slab.h> 24 #include <linux/platform_data/gpio-omap.h> 25 #include <linux/platform_data/keypad-omap.h> 26 #include <linux/soc/ti/omap1-io.h> 27 28 #undef NEW_BOARD_LEARNING_MODE 29 30 static void omap_kp_tasklet(unsigned long); 31 static void omap_kp_timer(struct timer_list *); 32 33 static unsigned char keypad_state[8]; 34 static DEFINE_MUTEX(kp_enable_mutex); 35 static int kp_enable = 1; 36 static int kp_cur_group = -1; 37 38 struct omap_kp { 39 struct input_dev *input; 40 struct timer_list timer; 41 int irq; 42 unsigned int rows; 43 unsigned int cols; 44 unsigned long delay; 45 unsigned int debounce; 46 unsigned short keymap[]; 47 }; 48 49 static DECLARE_TASKLET_DISABLED_OLD(kp_tasklet, omap_kp_tasklet); 50 51 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) 52 { 53 /* disable keyboard interrupt and schedule for handling */ 54 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 55 56 tasklet_schedule(&kp_tasklet); 57 58 return IRQ_HANDLED; 59 } 60 61 static void omap_kp_timer(struct timer_list *unused) 62 { 63 tasklet_schedule(&kp_tasklet); 64 } 65 66 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state) 67 { 68 int col = 0; 69 70 /* disable keyboard interrupt and schedule for handling */ 71 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 72 73 /* read the keypad status */ 74 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 75 for (col = 0; col < omap_kp->cols; col++) { 76 omap_writew(~(1 << col) & 0xff, 77 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 78 79 udelay(omap_kp->delay); 80 81 state[col] = ~omap_readw(OMAP1_MPUIO_BASE + 82 OMAP_MPUIO_KBR_LATCH) & 0xff; 83 } 84 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 85 udelay(2); 86 } 87 88 static void omap_kp_tasklet(unsigned long data) 89 { 90 struct omap_kp *omap_kp_data = (struct omap_kp *) data; 91 unsigned short *keycodes = omap_kp_data->input->keycode; 92 unsigned int row_shift = get_count_order(omap_kp_data->cols); 93 unsigned char new_state[8], changed, key_down = 0; 94 int col, row; 95 96 /* check for any changes */ 97 omap_kp_scan_keypad(omap_kp_data, new_state); 98 99 /* check for changes and print those */ 100 for (col = 0; col < omap_kp_data->cols; col++) { 101 changed = new_state[col] ^ keypad_state[col]; 102 key_down |= new_state[col]; 103 if (changed == 0) 104 continue; 105 106 for (row = 0; row < omap_kp_data->rows; row++) { 107 int key; 108 if (!(changed & (1 << row))) 109 continue; 110 #ifdef NEW_BOARD_LEARNING_MODE 111 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, 112 row, (new_state[col] & (1 << row)) ? 113 "pressed" : "released"); 114 #else 115 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)]; 116 117 if (!(kp_cur_group == (key & GROUP_MASK) || 118 kp_cur_group == -1)) 119 continue; 120 121 kp_cur_group = key & GROUP_MASK; 122 input_report_key(omap_kp_data->input, key & ~GROUP_MASK, 123 new_state[col] & (1 << row)); 124 #endif 125 } 126 } 127 input_sync(omap_kp_data->input); 128 memcpy(keypad_state, new_state, sizeof(keypad_state)); 129 130 if (key_down) { 131 /* some key is pressed - keep irq disabled and use timer 132 * to poll the keypad */ 133 mod_timer(&omap_kp_data->timer, jiffies + HZ / 20); 134 } else { 135 /* enable interrupts */ 136 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 137 kp_cur_group = -1; 138 } 139 } 140 141 static ssize_t omap_kp_enable_show(struct device *dev, 142 struct device_attribute *attr, char *buf) 143 { 144 return sprintf(buf, "%u\n", kp_enable); 145 } 146 147 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr, 148 const char *buf, size_t count) 149 { 150 struct omap_kp *omap_kp = dev_get_drvdata(dev); 151 int state; 152 153 if (sscanf(buf, "%u", &state) != 1) 154 return -EINVAL; 155 156 if ((state != 1) && (state != 0)) 157 return -EINVAL; 158 159 mutex_lock(&kp_enable_mutex); 160 if (state != kp_enable) { 161 if (state) 162 enable_irq(omap_kp->irq); 163 else 164 disable_irq(omap_kp->irq); 165 kp_enable = state; 166 } 167 mutex_unlock(&kp_enable_mutex); 168 169 return strnlen(buf, count); 170 } 171 172 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store); 173 174 static struct attribute *omap_kp_attrs[] = { 175 &dev_attr_enable.attr, 176 NULL 177 }; 178 ATTRIBUTE_GROUPS(omap_kp); 179 180 static int omap_kp_probe(struct platform_device *pdev) 181 { 182 struct omap_kp *omap_kp; 183 struct input_dev *input_dev; 184 struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev); 185 int ret; 186 unsigned int row_shift, keycodemax; 187 188 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) { 189 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n"); 190 return -EINVAL; 191 } 192 193 row_shift = get_count_order(pdata->cols); 194 keycodemax = pdata->rows << row_shift; 195 196 omap_kp = kzalloc(struct_size(omap_kp, keymap, keycodemax), GFP_KERNEL); 197 input_dev = input_allocate_device(); 198 if (!omap_kp || !input_dev) { 199 kfree(omap_kp); 200 input_free_device(input_dev); 201 return -ENOMEM; 202 } 203 204 platform_set_drvdata(pdev, omap_kp); 205 206 omap_kp->input = input_dev; 207 208 /* Disable the interrupt for the MPUIO keyboard */ 209 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 210 211 if (pdata->delay) 212 omap_kp->delay = pdata->delay; 213 214 omap_kp->rows = pdata->rows; 215 omap_kp->cols = pdata->cols; 216 217 timer_setup(&omap_kp->timer, omap_kp_timer, 0); 218 219 /* get the irq and init timer*/ 220 kp_tasklet.data = (unsigned long) omap_kp; 221 tasklet_enable(&kp_tasklet); 222 223 /* setup input device */ 224 input_dev->name = "omap-keypad"; 225 input_dev->phys = "omap-keypad/input0"; 226 input_dev->dev.parent = &pdev->dev; 227 228 input_dev->id.bustype = BUS_HOST; 229 input_dev->id.vendor = 0x0001; 230 input_dev->id.product = 0x0001; 231 input_dev->id.version = 0x0100; 232 233 if (pdata->rep) 234 __set_bit(EV_REP, input_dev->evbit); 235 236 ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL, 237 pdata->rows, pdata->cols, 238 omap_kp->keymap, input_dev); 239 if (ret < 0) 240 goto err2; 241 242 ret = input_register_device(omap_kp->input); 243 if (ret < 0) { 244 printk(KERN_ERR "Unable to register omap-keypad input device\n"); 245 goto err2; 246 } 247 248 if (pdata->dbounce) 249 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); 250 251 /* scan current status and enable interrupt */ 252 omap_kp_scan_keypad(omap_kp, keypad_state); 253 omap_kp->irq = platform_get_irq(pdev, 0); 254 if (omap_kp->irq >= 0) { 255 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0, 256 "omap-keypad", omap_kp) < 0) 257 goto err3; 258 } 259 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 260 261 return 0; 262 263 err3: 264 input_unregister_device(omap_kp->input); 265 input_dev = NULL; 266 err2: 267 kfree(omap_kp); 268 input_free_device(input_dev); 269 270 return -EINVAL; 271 } 272 273 static void omap_kp_remove(struct platform_device *pdev) 274 { 275 struct omap_kp *omap_kp = platform_get_drvdata(pdev); 276 277 /* disable keypad interrupt handling */ 278 tasklet_disable(&kp_tasklet); 279 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 280 free_irq(omap_kp->irq, omap_kp); 281 282 timer_shutdown_sync(&omap_kp->timer); 283 tasklet_kill(&kp_tasklet); 284 285 /* unregister everything */ 286 input_unregister_device(omap_kp->input); 287 288 kfree(omap_kp); 289 } 290 291 static struct platform_driver omap_kp_driver = { 292 .probe = omap_kp_probe, 293 .remove_new = omap_kp_remove, 294 .driver = { 295 .name = "omap-keypad", 296 .dev_groups = omap_kp_groups, 297 }, 298 }; 299 module_platform_driver(omap_kp_driver); 300 301 MODULE_AUTHOR("Timo Teräs"); 302 MODULE_DESCRIPTION("OMAP Keypad Driver"); 303 MODULE_LICENSE("GPL"); 304 MODULE_ALIAS("platform:omap-keypad"); 305