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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ad4e09b1 KS |
2 | /* |
3 | * linux/drivers/input/keyboard/omap-keypad.c | |
4 | * | |
5 | * OMAP Keypad Driver | |
6 | * | |
7 | * Copyright (C) 2003 Nokia Corporation | |
96de0e25 | 8 | * Written by Timo Teräs <ext-timo.teras@nokia.com> |
ad4e09b1 KS |
9 | * |
10 | * Added support for H2 & H3 Keypad | |
11 | * Copyright (C) 2004 Texas Instruments | |
ad4e09b1 KS |
12 | */ |
13 | ||
14 | #include <linux/module.h> | |
ad4e09b1 KS |
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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
f799a3d8 | 24 | #include <linux/platform_data/gpio-omap.h> |
2203747c | 25 | #include <linux/platform_data/keypad-omap.h> |
0ae41a0b | 26 | #include <linux/soc/ti/omap1-io.h> |
ad4e09b1 KS |
27 | |
28 | #undef NEW_BOARD_LEARNING_MODE | |
29 | ||
30 | static void omap_kp_tasklet(unsigned long); | |
4ea40278 | 31 | static void omap_kp_timer(struct timer_list *); |
ad4e09b1 KS |
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; | |
1932811f | 46 | unsigned short keymap[]; |
ad4e09b1 KS |
47 | }; |
48 | ||
b13fecb1 | 49 | static DECLARE_TASKLET_DISABLED_OLD(kp_tasklet, omap_kp_tasklet); |
ad4e09b1 | 50 | |
7d12e780 | 51 | static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) |
ad4e09b1 | 52 | { |
ad4e09b1 | 53 | /* disable keyboard interrupt and schedule for handling */ |
f799a3d8 | 54 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 KS |
55 | |
56 | tasklet_schedule(&kp_tasklet); | |
57 | ||
58 | return IRQ_HANDLED; | |
59 | } | |
60 | ||
4ea40278 | 61 | static void omap_kp_timer(struct timer_list *unused) |
ad4e09b1 KS |
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 | ||
f799a3d8 TL |
70 | /* disable keyboard interrupt and schedule for handling */ |
71 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
ad4e09b1 | 72 | |
f799a3d8 TL |
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); | |
ad4e09b1 | 78 | |
f799a3d8 | 79 | udelay(omap_kp->delay); |
ad4e09b1 | 80 | |
f799a3d8 TL |
81 | state[col] = ~omap_readw(OMAP1_MPUIO_BASE + |
82 | OMAP_MPUIO_KBR_LATCH) & 0xff; | |
ad4e09b1 | 83 | } |
f799a3d8 TL |
84 | omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); |
85 | udelay(2); | |
ad4e09b1 KS |
86 | } |
87 | ||
ad4e09b1 KS |
88 | static void omap_kp_tasklet(unsigned long data) |
89 | { | |
90 | struct omap_kp *omap_kp_data = (struct omap_kp *) data; | |
da1f026b JK |
91 | unsigned short *keycodes = omap_kp_data->input->keycode; |
92 | unsigned int row_shift = get_count_order(omap_kp_data->cols); | |
ad4e09b1 KS |
93 | unsigned char new_state[8], changed, key_down = 0; |
94 | int col, row; | |
ad4e09b1 KS |
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 | |
da1f026b | 115 | key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)]; |
ad4e09b1 KS |
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 | } | |
b27af563 | 127 | input_sync(omap_kp_data->input); |
ad4e09b1 KS |
128 | memcpy(keypad_state, new_state, sizeof(keypad_state)); |
129 | ||
130 | if (key_down) { | |
ad4e09b1 KS |
131 | /* some key is pressed - keep irq disabled and use timer |
132 | * to poll the keypad */ | |
94016680 | 133 | mod_timer(&omap_kp_data->timer, jiffies + HZ / 20); |
ad4e09b1 KS |
134 | } else { |
135 | /* enable interrupts */ | |
f799a3d8 TL |
136 | omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
137 | kp_cur_group = -1; | |
9360353f | 138 | } |
ad4e09b1 KS |
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 | { | |
f799a3d8 | 150 | struct omap_kp *omap_kp = dev_get_drvdata(dev); |
ad4e09b1 KS |
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) | |
f799a3d8 | 162 | enable_irq(omap_kp->irq); |
ad4e09b1 | 163 | else |
f799a3d8 | 164 | disable_irq(omap_kp->irq); |
ad4e09b1 KS |
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 | ||
2d7877d7 DT |
174 | static struct attribute *omap_kp_attrs[] = { |
175 | &dev_attr_enable.attr, | |
176 | NULL | |
177 | }; | |
178 | ATTRIBUTE_GROUPS(omap_kp); | |
179 | ||
5298cc4c | 180 | static int omap_kp_probe(struct platform_device *pdev) |
ad4e09b1 KS |
181 | { |
182 | struct omap_kp *omap_kp; | |
183 | struct input_dev *input_dev; | |
c838cb3d | 184 | struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev); |
e53c18da | 185 | int ret; |
da1f026b | 186 | unsigned int row_shift, keycodemax; |
ad4e09b1 | 187 | |
da1f026b JK |
188 | if (!pdata->rows || !pdata->cols || !pdata->keymap_data) { |
189 | printk(KERN_ERR "No rows, cols or keymap_data from pdata\n"); | |
ad4e09b1 KS |
190 | return -EINVAL; |
191 | } | |
192 | ||
da1f026b JK |
193 | row_shift = get_count_order(pdata->cols); |
194 | keycodemax = pdata->rows << row_shift; | |
195 | ||
cef6f5cc | 196 | omap_kp = kzalloc(struct_size(omap_kp, keymap, keycodemax), GFP_KERNEL); |
ad4e09b1 KS |
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 */ | |
f799a3d8 | 209 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 | 210 | |
ad4e09b1 KS |
211 | if (pdata->delay) |
212 | omap_kp->delay = pdata->delay; | |
213 | ||
ad4e09b1 KS |
214 | omap_kp->rows = pdata->rows; |
215 | omap_kp->cols = pdata->cols; | |
216 | ||
4ea40278 | 217 | timer_setup(&omap_kp->timer, omap_kp_timer, 0); |
ad4e09b1 KS |
218 | |
219 | /* get the irq and init timer*/ | |
ad4e09b1 | 220 | kp_tasklet.data = (unsigned long) omap_kp; |
7ae6cfe8 | 221 | tasklet_enable(&kp_tasklet); |
ad4e09b1 | 222 | |
ad4e09b1 | 223 | /* setup input device */ |
ad4e09b1 KS |
224 | input_dev->name = "omap-keypad"; |
225 | input_dev->phys = "omap-keypad/input0"; | |
469ba4df | 226 | input_dev->dev.parent = &pdev->dev; |
ad4e09b1 KS |
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 | ||
1932811f DT |
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) | |
2d7877d7 | 240 | goto err2; |
1932811f | 241 | |
ad4e09b1 KS |
242 | ret = input_register_device(omap_kp->input); |
243 | if (ret < 0) { | |
244 | printk(KERN_ERR "Unable to register omap-keypad input device\n"); | |
2d7877d7 | 245 | goto err2; |
ad4e09b1 KS |
246 | } |
247 | ||
248 | if (pdata->dbounce) | |
6175556f | 249 | omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); |
ad4e09b1 KS |
250 | |
251 | /* scan current status and enable interrupt */ | |
252 | omap_kp_scan_keypad(omap_kp, keypad_state); | |
f799a3d8 TL |
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) | |
2d7877d7 | 257 | goto err3; |
ad4e09b1 | 258 | } |
f799a3d8 TL |
259 | omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
260 | ||
ad4e09b1 | 261 | return 0; |
f799a3d8 | 262 | |
2d7877d7 | 263 | err3: |
ad4e09b1 KS |
264 | input_unregister_device(omap_kp->input); |
265 | input_dev = NULL; | |
ad4e09b1 | 266 | err2: |
ad4e09b1 KS |
267 | kfree(omap_kp); |
268 | input_free_device(input_dev); | |
269 | ||
270 | return -EINVAL; | |
271 | } | |
272 | ||
d93f3feb | 273 | static void omap_kp_remove(struct platform_device *pdev) |
ad4e09b1 KS |
274 | { |
275 | struct omap_kp *omap_kp = platform_get_drvdata(pdev); | |
276 | ||
277 | /* disable keypad interrupt handling */ | |
278 | tasklet_disable(&kp_tasklet); | |
f799a3d8 TL |
279 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
280 | free_irq(omap_kp->irq, omap_kp); | |
ad4e09b1 | 281 | |
292a089d | 282 | timer_shutdown_sync(&omap_kp->timer); |
ad4e09b1 KS |
283 | tasklet_kill(&kp_tasklet); |
284 | ||
285 | /* unregister everything */ | |
286 | input_unregister_device(omap_kp->input); | |
287 | ||
288 | kfree(omap_kp); | |
ad4e09b1 KS |
289 | } |
290 | ||
291 | static struct platform_driver omap_kp_driver = { | |
292 | .probe = omap_kp_probe, | |
d93f3feb | 293 | .remove_new = omap_kp_remove, |
ad4e09b1 KS |
294 | .driver = { |
295 | .name = "omap-keypad", | |
2d7877d7 | 296 | .dev_groups = omap_kp_groups, |
ad4e09b1 KS |
297 | }, |
298 | }; | |
5146c84f | 299 | module_platform_driver(omap_kp_driver); |
ad4e09b1 | 300 | |
96de0e25 | 301 | MODULE_AUTHOR("Timo Teräs"); |
ad4e09b1 KS |
302 | MODULE_DESCRIPTION("OMAP Keypad Driver"); |
303 | MODULE_LICENSE("GPL"); | |
d7b5247b | 304 | MODULE_ALIAS("platform:omap-keypad"); |