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795e6bf3 MD |
1 | /* |
2 | * SuperH KEYSC Keypad Driver | |
3 | * | |
4 | * Copyright (C) 2008 Magnus Damm | |
5 | * | |
6 | * Based on gpio_keys.c, Copyright 2005 Phil Blundell | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/input.h> | |
fc1d003d | 21 | #include <linux/input/sh_keysc.h> |
090d951b | 22 | #include <linux/clk.h> |
795e6bf3 | 23 | #include <linux/io.h> |
795e6bf3 MD |
24 | |
25 | #define KYCR1_OFFS 0x00 | |
26 | #define KYCR2_OFFS 0x04 | |
27 | #define KYINDR_OFFS 0x08 | |
28 | #define KYOUTDR_OFFS 0x0c | |
29 | ||
30 | #define KYCR2_IRQ_LEVEL 0x10 | |
31 | #define KYCR2_IRQ_DISABLED 0x00 | |
32 | ||
33 | static const struct { | |
34 | unsigned char kymd, keyout, keyin; | |
35 | } sh_keysc_mode[] = { | |
36 | [SH_KEYSC_MODE_1] = { 0, 6, 5 }, | |
37 | [SH_KEYSC_MODE_2] = { 1, 5, 6 }, | |
38 | [SH_KEYSC_MODE_3] = { 2, 4, 7 }, | |
39 | }; | |
40 | ||
41 | struct sh_keysc_priv { | |
42 | void __iomem *iomem_base; | |
090d951b | 43 | struct clk *clk; |
795e6bf3 MD |
44 | unsigned long last_keys; |
45 | struct input_dev *input; | |
46 | struct sh_keysc_info pdata; | |
47 | }; | |
48 | ||
49 | static irqreturn_t sh_keysc_isr(int irq, void *dev_id) | |
50 | { | |
51 | struct platform_device *pdev = dev_id; | |
52 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); | |
53 | struct sh_keysc_info *pdata = &priv->pdata; | |
54 | unsigned long keys, keys1, keys0, mask; | |
55 | unsigned char keyin_set, tmp; | |
56 | int i, k; | |
57 | ||
58 | dev_dbg(&pdev->dev, "isr!\n"); | |
59 | ||
60 | keys1 = ~0; | |
61 | keys0 = 0; | |
62 | ||
63 | do { | |
64 | keys = 0; | |
65 | keyin_set = 0; | |
66 | ||
67 | iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS); | |
68 | ||
69 | for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) { | |
70 | iowrite16(0xfff ^ (3 << (i * 2)), | |
71 | priv->iomem_base + KYOUTDR_OFFS); | |
72 | udelay(pdata->delay); | |
73 | tmp = ioread16(priv->iomem_base + KYINDR_OFFS); | |
74 | keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i); | |
75 | tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1; | |
76 | keyin_set |= tmp; | |
77 | } | |
78 | ||
79 | iowrite16(0, priv->iomem_base + KYOUTDR_OFFS); | |
80 | iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8), | |
81 | priv->iomem_base + KYCR2_OFFS); | |
82 | ||
1f85d381 KM |
83 | if (pdata->kycr2_delay) |
84 | udelay(pdata->kycr2_delay); | |
85 | ||
795e6bf3 MD |
86 | keys ^= ~0; |
87 | keys &= (1 << (sh_keysc_mode[pdata->mode].keyin * | |
88 | sh_keysc_mode[pdata->mode].keyout)) - 1; | |
89 | keys1 &= keys; | |
90 | keys0 |= keys; | |
91 | ||
92 | dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys); | |
93 | ||
94 | } while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01); | |
95 | ||
96 | dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n", | |
97 | priv->last_keys, keys0, keys1); | |
98 | ||
99 | for (i = 0; i < SH_KEYSC_MAXKEYS; i++) { | |
100 | k = pdata->keycodes[i]; | |
101 | if (!k) | |
102 | continue; | |
103 | ||
104 | mask = 1 << i; | |
105 | ||
106 | if (!((priv->last_keys ^ keys0) & mask)) | |
107 | continue; | |
108 | ||
109 | if ((keys1 | keys0) & mask) { | |
110 | input_event(priv->input, EV_KEY, k, 1); | |
111 | priv->last_keys |= mask; | |
112 | } | |
113 | ||
114 | if (!(keys1 & mask)) { | |
115 | input_event(priv->input, EV_KEY, k, 0); | |
116 | priv->last_keys &= ~mask; | |
117 | } | |
118 | ||
119 | } | |
120 | input_sync(priv->input); | |
121 | ||
122 | return IRQ_HANDLED; | |
123 | } | |
124 | ||
125 | #define res_size(res) ((res)->end - (res)->start + 1) | |
126 | ||
127 | static int __devinit sh_keysc_probe(struct platform_device *pdev) | |
128 | { | |
129 | struct sh_keysc_priv *priv; | |
130 | struct sh_keysc_info *pdata; | |
131 | struct resource *res; | |
132 | struct input_dev *input; | |
090d951b | 133 | char clk_name[8]; |
24d01c06 | 134 | int i; |
795e6bf3 MD |
135 | int irq, error; |
136 | ||
137 | if (!pdev->dev.platform_data) { | |
138 | dev_err(&pdev->dev, "no platform data defined\n"); | |
139 | error = -EINVAL; | |
140 | goto err0; | |
141 | } | |
142 | ||
143 | error = -ENXIO; | |
144 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
145 | if (res == NULL) { | |
146 | dev_err(&pdev->dev, "failed to get I/O memory\n"); | |
147 | goto err0; | |
148 | } | |
149 | ||
150 | irq = platform_get_irq(pdev, 0); | |
151 | if (irq < 0) { | |
152 | dev_err(&pdev->dev, "failed to get irq\n"); | |
153 | goto err0; | |
154 | } | |
155 | ||
156 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
157 | if (priv == NULL) { | |
158 | dev_err(&pdev->dev, "failed to allocate driver data\n"); | |
159 | error = -ENOMEM; | |
160 | goto err0; | |
161 | } | |
162 | ||
163 | platform_set_drvdata(pdev, priv); | |
164 | memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata)); | |
165 | pdata = &priv->pdata; | |
166 | ||
795e6bf3 MD |
167 | priv->iomem_base = ioremap_nocache(res->start, res_size(res)); |
168 | if (priv->iomem_base == NULL) { | |
169 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); | |
170 | error = -ENXIO; | |
d3aa43a9 | 171 | goto err1; |
795e6bf3 MD |
172 | } |
173 | ||
090d951b MD |
174 | snprintf(clk_name, sizeof(clk_name), "keysc%d", pdev->id); |
175 | priv->clk = clk_get(&pdev->dev, clk_name); | |
176 | if (IS_ERR(priv->clk)) { | |
177 | dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name); | |
178 | error = PTR_ERR(priv->clk); | |
179 | goto err2; | |
180 | } | |
181 | ||
795e6bf3 MD |
182 | priv->input = input_allocate_device(); |
183 | if (!priv->input) { | |
184 | dev_err(&pdev->dev, "failed to allocate input device\n"); | |
185 | error = -ENOMEM; | |
090d951b | 186 | goto err3; |
795e6bf3 MD |
187 | } |
188 | ||
189 | input = priv->input; | |
190 | input->evbit[0] = BIT_MASK(EV_KEY); | |
191 | ||
192 | input->name = pdev->name; | |
193 | input->phys = "sh-keysc-keys/input0"; | |
194 | input->dev.parent = &pdev->dev; | |
195 | ||
196 | input->id.bustype = BUS_HOST; | |
197 | input->id.vendor = 0x0001; | |
198 | input->id.product = 0x0001; | |
199 | input->id.version = 0x0100; | |
200 | ||
24d01c06 DT |
201 | input->keycode = pdata->keycodes; |
202 | input->keycodesize = sizeof(pdata->keycodes[0]); | |
203 | input->keycodemax = ARRAY_SIZE(pdata->keycodes); | |
204 | ||
795e6bf3 MD |
205 | error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev); |
206 | if (error) { | |
207 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
090d951b | 208 | goto err4; |
795e6bf3 MD |
209 | } |
210 | ||
24d01c06 DT |
211 | for (i = 0; i < SH_KEYSC_MAXKEYS; i++) |
212 | __set_bit(pdata->keycodes[i], input->keybit); | |
213 | __clear_bit(KEY_RESERVED, input->keybit); | |
795e6bf3 MD |
214 | |
215 | error = input_register_device(input); | |
216 | if (error) { | |
217 | dev_err(&pdev->dev, "failed to register input device\n"); | |
090d951b | 218 | goto err5; |
795e6bf3 MD |
219 | } |
220 | ||
090d951b MD |
221 | clk_enable(priv->clk); |
222 | ||
795e6bf3 MD |
223 | iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) | |
224 | pdata->scan_timing, priv->iomem_base + KYCR1_OFFS); | |
225 | iowrite16(0, priv->iomem_base + KYOUTDR_OFFS); | |
226 | iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS); | |
a29b99ec MD |
227 | |
228 | device_init_wakeup(&pdev->dev, 1); | |
24d01c06 | 229 | |
795e6bf3 | 230 | return 0; |
24d01c06 | 231 | |
090d951b | 232 | err5: |
d3aa43a9 | 233 | free_irq(irq, pdev); |
090d951b | 234 | err4: |
d3aa43a9 | 235 | input_free_device(input); |
090d951b MD |
236 | err3: |
237 | clk_put(priv->clk); | |
795e6bf3 | 238 | err2: |
d3aa43a9 | 239 | iounmap(priv->iomem_base); |
795e6bf3 MD |
240 | err1: |
241 | platform_set_drvdata(pdev, NULL); | |
242 | kfree(priv); | |
243 | err0: | |
244 | return error; | |
245 | } | |
246 | ||
247 | static int __devexit sh_keysc_remove(struct platform_device *pdev) | |
248 | { | |
249 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); | |
795e6bf3 MD |
250 | |
251 | iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS); | |
252 | ||
253 | input_unregister_device(priv->input); | |
254 | free_irq(platform_get_irq(pdev, 0), pdev); | |
795e6bf3 MD |
255 | iounmap(priv->iomem_base); |
256 | ||
090d951b MD |
257 | clk_disable(priv->clk); |
258 | clk_put(priv->clk); | |
259 | ||
795e6bf3 MD |
260 | platform_set_drvdata(pdev, NULL); |
261 | kfree(priv); | |
24d01c06 | 262 | |
795e6bf3 MD |
263 | return 0; |
264 | } | |
265 | ||
a29b99ec MD |
266 | static int sh_keysc_suspend(struct device *dev) |
267 | { | |
49976927 MD |
268 | struct platform_device *pdev = to_platform_device(dev); |
269 | struct sh_keysc_priv *priv = platform_get_drvdata(pdev); | |
4ba50df6 | 270 | int irq = platform_get_irq(pdev, 0); |
a29b99ec MD |
271 | unsigned short value; |
272 | ||
a29b99ec | 273 | value = ioread16(priv->iomem_base + KYCR1_OFFS); |
795e6bf3 | 274 | |
4ba50df6 | 275 | if (device_may_wakeup(dev)) { |
a29b99ec | 276 | value |= 0x80; |
4ba50df6 | 277 | enable_irq_wake(irq); |
24d01c06 | 278 | } else { |
a29b99ec | 279 | value &= ~0x80; |
24d01c06 | 280 | } |
a29b99ec MD |
281 | |
282 | iowrite16(value, priv->iomem_base + KYCR1_OFFS); | |
24d01c06 | 283 | |
a29b99ec MD |
284 | return 0; |
285 | } | |
286 | ||
4ba50df6 MD |
287 | static int sh_keysc_resume(struct device *dev) |
288 | { | |
289 | struct platform_device *pdev = to_platform_device(dev); | |
290 | int irq = platform_get_irq(pdev, 0); | |
291 | ||
292 | if (device_may_wakeup(dev)) | |
293 | disable_irq_wake(irq); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
47145210 | 298 | static const struct dev_pm_ops sh_keysc_dev_pm_ops = { |
a29b99ec | 299 | .suspend = sh_keysc_suspend, |
4ba50df6 | 300 | .resume = sh_keysc_resume, |
a29b99ec | 301 | }; |
795e6bf3 MD |
302 | |
303 | struct platform_driver sh_keysc_device_driver = { | |
304 | .probe = sh_keysc_probe, | |
305 | .remove = __devexit_p(sh_keysc_remove), | |
795e6bf3 MD |
306 | .driver = { |
307 | .name = "sh_keysc", | |
a29b99ec | 308 | .pm = &sh_keysc_dev_pm_ops, |
795e6bf3 MD |
309 | } |
310 | }; | |
311 | ||
312 | static int __init sh_keysc_init(void) | |
313 | { | |
314 | return platform_driver_register(&sh_keysc_device_driver); | |
315 | } | |
316 | ||
317 | static void __exit sh_keysc_exit(void) | |
318 | { | |
319 | platform_driver_unregister(&sh_keysc_device_driver); | |
320 | } | |
321 | ||
322 | module_init(sh_keysc_init); | |
323 | module_exit(sh_keysc_exit); | |
324 | ||
325 | MODULE_AUTHOR("Magnus Damm"); | |
326 | MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver"); | |
327 | MODULE_LICENSE("GPL"); |