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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
bc09dcad MA |
2 | /* |
3 | * DaVinci Key Scan Driver for TI platforms | |
4 | * | |
5 | * Copyright (C) 2009 Texas Instruments, Inc | |
6 | * | |
7 | * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com> | |
8 | * | |
25985edc | 9 | * Initial Code: Sandeep Paulraj <s-paulraj@ti.com> |
bc09dcad MA |
10 | */ |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/input.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/errno.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
bc09dcad | 21 | |
ec2a0833 | 22 | #include <linux/platform_data/keyscan-davinci.h> |
bc09dcad MA |
23 | |
24 | /* Key scan registers */ | |
25 | #define DAVINCI_KEYSCAN_KEYCTRL 0x0000 | |
26 | #define DAVINCI_KEYSCAN_INTENA 0x0004 | |
27 | #define DAVINCI_KEYSCAN_INTFLAG 0x0008 | |
28 | #define DAVINCI_KEYSCAN_INTCLR 0x000c | |
29 | #define DAVINCI_KEYSCAN_STRBWIDTH 0x0010 | |
30 | #define DAVINCI_KEYSCAN_INTERVAL 0x0014 | |
31 | #define DAVINCI_KEYSCAN_CONTTIME 0x0018 | |
32 | #define DAVINCI_KEYSCAN_CURRENTST 0x001c | |
33 | #define DAVINCI_KEYSCAN_PREVSTATE 0x0020 | |
34 | #define DAVINCI_KEYSCAN_EMUCTRL 0x0024 | |
35 | #define DAVINCI_KEYSCAN_IODFTCTRL 0x002c | |
36 | ||
37 | /* Key Control Register (KEYCTRL) */ | |
38 | #define DAVINCI_KEYSCAN_KEYEN 0x00000001 | |
39 | #define DAVINCI_KEYSCAN_PREVMODE 0x00000002 | |
40 | #define DAVINCI_KEYSCAN_CHATOFF 0x00000004 | |
41 | #define DAVINCI_KEYSCAN_AUTODET 0x00000008 | |
42 | #define DAVINCI_KEYSCAN_SCANMODE 0x00000010 | |
43 | #define DAVINCI_KEYSCAN_OUTTYPE 0x00000020 | |
44 | ||
45 | /* Masks for the interrupts */ | |
46 | #define DAVINCI_KEYSCAN_INT_CONT 0x00000008 | |
47 | #define DAVINCI_KEYSCAN_INT_OFF 0x00000004 | |
48 | #define DAVINCI_KEYSCAN_INT_ON 0x00000002 | |
49 | #define DAVINCI_KEYSCAN_INT_CHANGE 0x00000001 | |
50 | #define DAVINCI_KEYSCAN_INT_ALL 0x0000000f | |
51 | ||
52 | struct davinci_ks { | |
53 | struct input_dev *input; | |
54 | struct davinci_ks_platform_data *pdata; | |
55 | int irq; | |
56 | void __iomem *base; | |
57 | resource_size_t pbase; | |
58 | size_t base_size; | |
59 | unsigned short keymap[]; | |
60 | }; | |
61 | ||
62 | /* Initializing the kp Module */ | |
63 | static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks) | |
64 | { | |
65 | struct device *dev = &davinci_ks->input->dev; | |
66 | struct davinci_ks_platform_data *pdata = davinci_ks->pdata; | |
67 | u32 matrix_ctrl; | |
68 | ||
69 | /* Enable all interrupts */ | |
70 | __raw_writel(DAVINCI_KEYSCAN_INT_ALL, | |
71 | davinci_ks->base + DAVINCI_KEYSCAN_INTENA); | |
72 | ||
73 | /* Clear interrupts if any */ | |
74 | __raw_writel(DAVINCI_KEYSCAN_INT_ALL, | |
75 | davinci_ks->base + DAVINCI_KEYSCAN_INTCLR); | |
76 | ||
77 | /* Setup the scan period = strobe + interval */ | |
78 | __raw_writel(pdata->strobe, | |
79 | davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH); | |
80 | __raw_writel(pdata->interval, | |
81 | davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL); | |
82 | __raw_writel(0x01, | |
83 | davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME); | |
84 | ||
85 | /* Define matrix type */ | |
86 | switch (pdata->matrix_type) { | |
87 | case DAVINCI_KEYSCAN_MATRIX_4X4: | |
88 | matrix_ctrl = 0; | |
89 | break; | |
90 | case DAVINCI_KEYSCAN_MATRIX_5X3: | |
91 | matrix_ctrl = (1 << 6); | |
92 | break; | |
93 | default: | |
94 | dev_err(dev->parent, "wrong matrix type\n"); | |
95 | return -EINVAL; | |
96 | } | |
97 | ||
98 | /* Enable key scan module and set matrix type */ | |
99 | __raw_writel(DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN | | |
100 | matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id) | |
106 | { | |
107 | struct davinci_ks *davinci_ks = dev_id; | |
108 | struct device *dev = &davinci_ks->input->dev; | |
109 | unsigned short *keymap = davinci_ks->keymap; | |
110 | int keymapsize = davinci_ks->pdata->keymapsize; | |
111 | u32 prev_status, new_status, changed; | |
112 | bool release; | |
113 | int keycode = KEY_UNKNOWN; | |
114 | int i; | |
115 | ||
116 | /* Disable interrupt */ | |
117 | __raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA); | |
118 | ||
119 | /* Reading previous and new status of the key scan */ | |
120 | prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE); | |
121 | new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST); | |
122 | ||
123 | changed = prev_status ^ new_status; | |
124 | ||
125 | if (changed) { | |
126 | /* | |
127 | * It goes through all bits in 'changed' to ensure | |
128 | * that no key changes are being missed | |
129 | */ | |
130 | for (i = 0 ; i < keymapsize; i++) { | |
131 | if ((changed>>i) & 0x1) { | |
132 | keycode = keymap[i]; | |
133 | release = (new_status >> i) & 0x1; | |
134 | dev_dbg(dev->parent, "key %d %s\n", keycode, | |
135 | release ? "released" : "pressed"); | |
136 | input_report_key(davinci_ks->input, keycode, | |
137 | !release); | |
138 | input_sync(davinci_ks->input); | |
139 | } | |
140 | } | |
141 | /* Clearing interrupt */ | |
142 | __raw_writel(DAVINCI_KEYSCAN_INT_ALL, | |
143 | davinci_ks->base + DAVINCI_KEYSCAN_INTCLR); | |
144 | } | |
145 | ||
146 | /* Enable interrupts */ | |
147 | __raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA); | |
148 | ||
149 | return IRQ_HANDLED; | |
150 | } | |
151 | ||
152 | static int __init davinci_ks_probe(struct platform_device *pdev) | |
153 | { | |
154 | struct davinci_ks *davinci_ks; | |
155 | struct input_dev *key_dev; | |
156 | struct resource *res, *mem; | |
157 | struct device *dev = &pdev->dev; | |
b4e66e7d | 158 | struct davinci_ks_platform_data *pdata = dev_get_platdata(dev); |
bc09dcad MA |
159 | int error, i; |
160 | ||
861a6442 MA |
161 | if (pdata->device_enable) { |
162 | error = pdata->device_enable(dev); | |
163 | if (error < 0) { | |
164 | dev_dbg(dev, "device enable function failed\n"); | |
165 | return error; | |
166 | } | |
167 | } | |
168 | ||
bc09dcad MA |
169 | if (!pdata->keymap) { |
170 | dev_dbg(dev, "no keymap from pdata\n"); | |
171 | return -EINVAL; | |
172 | } | |
173 | ||
174 | davinci_ks = kzalloc(sizeof(struct davinci_ks) + | |
175 | sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL); | |
176 | if (!davinci_ks) { | |
177 | dev_dbg(dev, "could not allocate memory for private data\n"); | |
178 | return -ENOMEM; | |
179 | } | |
180 | ||
181 | memcpy(davinci_ks->keymap, pdata->keymap, | |
182 | sizeof(unsigned short) * pdata->keymapsize); | |
183 | ||
184 | key_dev = input_allocate_device(); | |
185 | if (!key_dev) { | |
186 | dev_dbg(dev, "could not allocate input device\n"); | |
187 | error = -ENOMEM; | |
188 | goto fail1; | |
189 | } | |
190 | ||
191 | davinci_ks->input = key_dev; | |
192 | ||
193 | davinci_ks->irq = platform_get_irq(pdev, 0); | |
194 | if (davinci_ks->irq < 0) { | |
195 | dev_err(dev, "no key scan irq\n"); | |
196 | error = davinci_ks->irq; | |
197 | goto fail2; | |
198 | } | |
199 | ||
200 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
201 | if (!res) { | |
202 | dev_err(dev, "no mem resource\n"); | |
203 | error = -EINVAL; | |
204 | goto fail2; | |
205 | } | |
206 | ||
207 | davinci_ks->pbase = res->start; | |
208 | davinci_ks->base_size = resource_size(res); | |
209 | ||
210 | mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size, | |
211 | pdev->name); | |
212 | if (!mem) { | |
213 | dev_err(dev, "key scan registers at %08x are not free\n", | |
214 | davinci_ks->pbase); | |
215 | error = -EBUSY; | |
216 | goto fail2; | |
217 | } | |
218 | ||
219 | davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size); | |
220 | if (!davinci_ks->base) { | |
221 | dev_err(dev, "can't ioremap MEM resource.\n"); | |
222 | error = -ENOMEM; | |
223 | goto fail3; | |
224 | } | |
225 | ||
226 | /* Enable auto repeat feature of Linux input subsystem */ | |
227 | if (pdata->rep) | |
228 | __set_bit(EV_REP, key_dev->evbit); | |
229 | ||
230 | /* Setup input device */ | |
231 | __set_bit(EV_KEY, key_dev->evbit); | |
232 | ||
233 | /* Setup the platform data */ | |
234 | davinci_ks->pdata = pdata; | |
235 | ||
236 | for (i = 0; i < davinci_ks->pdata->keymapsize; i++) | |
237 | __set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit); | |
238 | ||
239 | key_dev->name = "davinci_keyscan"; | |
240 | key_dev->phys = "davinci_keyscan/input0"; | |
b4e66e7d | 241 | key_dev->dev.parent = dev; |
bc09dcad MA |
242 | key_dev->id.bustype = BUS_HOST; |
243 | key_dev->id.vendor = 0x0001; | |
244 | key_dev->id.product = 0x0001; | |
245 | key_dev->id.version = 0x0001; | |
246 | key_dev->keycode = davinci_ks->keymap; | |
247 | key_dev->keycodesize = sizeof(davinci_ks->keymap[0]); | |
248 | key_dev->keycodemax = davinci_ks->pdata->keymapsize; | |
249 | ||
250 | error = input_register_device(davinci_ks->input); | |
251 | if (error < 0) { | |
252 | dev_err(dev, "unable to register davinci key scan device\n"); | |
253 | goto fail4; | |
254 | } | |
255 | ||
256 | error = request_irq(davinci_ks->irq, davinci_ks_interrupt, | |
ec4665c4 | 257 | 0, pdev->name, davinci_ks); |
bc09dcad MA |
258 | if (error < 0) { |
259 | dev_err(dev, "unable to register davinci key scan interrupt\n"); | |
260 | goto fail5; | |
261 | } | |
262 | ||
263 | error = davinci_ks_initialize(davinci_ks); | |
264 | if (error < 0) { | |
265 | dev_err(dev, "unable to initialize davinci key scan device\n"); | |
266 | goto fail6; | |
267 | } | |
268 | ||
269 | platform_set_drvdata(pdev, davinci_ks); | |
270 | return 0; | |
271 | ||
272 | fail6: | |
273 | free_irq(davinci_ks->irq, davinci_ks); | |
274 | fail5: | |
275 | input_unregister_device(davinci_ks->input); | |
276 | key_dev = NULL; | |
277 | fail4: | |
278 | iounmap(davinci_ks->base); | |
279 | fail3: | |
280 | release_mem_region(davinci_ks->pbase, davinci_ks->base_size); | |
281 | fail2: | |
282 | input_free_device(key_dev); | |
283 | fail1: | |
284 | kfree(davinci_ks); | |
285 | ||
286 | return error; | |
287 | } | |
288 | ||
e2619cf7 | 289 | static int davinci_ks_remove(struct platform_device *pdev) |
bc09dcad MA |
290 | { |
291 | struct davinci_ks *davinci_ks = platform_get_drvdata(pdev); | |
292 | ||
293 | free_irq(davinci_ks->irq, davinci_ks); | |
294 | ||
295 | input_unregister_device(davinci_ks->input); | |
296 | ||
297 | iounmap(davinci_ks->base); | |
298 | release_mem_region(davinci_ks->pbase, davinci_ks->base_size); | |
299 | ||
bc09dcad MA |
300 | kfree(davinci_ks); |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static struct platform_driver davinci_ks_driver = { | |
306 | .driver = { | |
307 | .name = "davinci_keyscan", | |
bc09dcad | 308 | }, |
1cb0aa88 | 309 | .remove = davinci_ks_remove, |
bc09dcad | 310 | }; |
d3d25808 | 311 | |
6b0bc60b | 312 | module_platform_driver_probe(davinci_ks_driver, davinci_ks_probe); |
bc09dcad MA |
313 | |
314 | MODULE_AUTHOR("Miguel Aguilar"); | |
315 | MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver"); | |
316 | MODULE_LICENSE("GPL"); |