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4a15235e WZ |
1 | /* |
2 | * Copyright (c) 2008-2009 Nuvoton technology corporation. | |
3 | * | |
4 | * Wan ZongShun <mcuos.com@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation;version 2 of the License. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/input.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/clk.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/io.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
4a15235e WZ |
23 | |
24 | #include <mach/w90p910_keypad.h> | |
25 | ||
26 | /* Keypad Interface Control Registers */ | |
27 | #define KPI_CONF 0x00 | |
28 | #define KPI_3KCONF 0x04 | |
29 | #define KPI_LPCONF 0x08 | |
30 | #define KPI_STATUS 0x0C | |
31 | ||
32 | #define IS1KEY (0x01 << 16) | |
33 | #define INTTR (0x01 << 21) | |
34 | #define KEY0R (0x0f << 3) | |
35 | #define KEY0C 0x07 | |
36 | #define DEBOUNCE_BIT 0x08 | |
37 | #define KSIZE0 (0x01 << 16) | |
38 | #define KSIZE1 (0x01 << 17) | |
39 | #define KPSEL (0x01 << 19) | |
40 | #define ENKP (0x01 << 18) | |
41 | ||
42 | #define KGET_RAW(n) (((n) & KEY0R) >> 3) | |
43 | #define KGET_COLUMN(n) ((n) & KEY0C) | |
44 | ||
09113aea DT |
45 | #define W90P910_MAX_KEY_NUM (8 * 8) |
46 | #define W90P910_ROW_SHIFT 3 | |
4a15235e WZ |
47 | |
48 | struct w90p910_keypad { | |
09113aea | 49 | const struct w90p910_keypad_platform_data *pdata; |
4a15235e WZ |
50 | struct clk *clk; |
51 | struct input_dev *input_dev; | |
52 | void __iomem *mmio_base; | |
53 | int irq; | |
09113aea | 54 | unsigned short keymap[W90P910_MAX_KEY_NUM]; |
4a15235e WZ |
55 | }; |
56 | ||
4a15235e WZ |
57 | static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad, |
58 | unsigned int status) | |
59 | { | |
09113aea DT |
60 | struct input_dev *input_dev = keypad->input_dev; |
61 | unsigned int row = KGET_RAW(status); | |
62 | unsigned int col = KGET_COLUMN(status); | |
63 | unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT); | |
64 | unsigned int key = keypad->keymap[code]; | |
65 | ||
66 | input_event(input_dev, EV_MSC, MSC_SCAN, code); | |
67 | input_report_key(input_dev, key, 1); | |
68 | input_sync(input_dev); | |
69 | ||
70 | input_event(input_dev, EV_MSC, MSC_SCAN, code); | |
71 | input_report_key(input_dev, key, 0); | |
72 | input_sync(input_dev); | |
4a15235e WZ |
73 | } |
74 | ||
75 | static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id) | |
76 | { | |
77 | struct w90p910_keypad *keypad = dev_id; | |
78 | unsigned int kstatus, val; | |
79 | ||
80 | kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS); | |
81 | ||
82 | val = INTTR | IS1KEY; | |
83 | ||
84 | if (kstatus & val) | |
85 | w90p910_keypad_scan_matrix(keypad, kstatus); | |
86 | ||
87 | return IRQ_HANDLED; | |
88 | } | |
89 | ||
90 | static int w90p910_keypad_open(struct input_dev *dev) | |
91 | { | |
92 | struct w90p910_keypad *keypad = input_get_drvdata(dev); | |
09113aea | 93 | const struct w90p910_keypad_platform_data *pdata = keypad->pdata; |
4a15235e WZ |
94 | unsigned int val, config; |
95 | ||
96 | /* Enable unit clock */ | |
97 | clk_enable(keypad->clk); | |
98 | ||
99 | val = __raw_readl(keypad->mmio_base + KPI_CONF); | |
100 | val |= (KPSEL | ENKP); | |
101 | val &= ~(KSIZE0 | KSIZE1); | |
102 | ||
103 | config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT); | |
104 | ||
105 | val |= config; | |
106 | ||
107 | __raw_writel(val, keypad->mmio_base + KPI_CONF); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | static void w90p910_keypad_close(struct input_dev *dev) | |
113 | { | |
114 | struct w90p910_keypad *keypad = input_get_drvdata(dev); | |
115 | ||
116 | /* Disable clock unit */ | |
117 | clk_disable(keypad->clk); | |
118 | } | |
119 | ||
120 | static int __devinit w90p910_keypad_probe(struct platform_device *pdev) | |
121 | { | |
09113aea DT |
122 | const struct w90p910_keypad_platform_data *pdata = |
123 | pdev->dev.platform_data; | |
903b9124 | 124 | const struct matrix_keymap_data *keymap_data; |
4a15235e WZ |
125 | struct w90p910_keypad *keypad; |
126 | struct input_dev *input_dev; | |
127 | struct resource *res; | |
09113aea DT |
128 | int irq; |
129 | int error; | |
4a15235e | 130 | |
09113aea | 131 | if (!pdata) { |
4a15235e | 132 | dev_err(&pdev->dev, "no platform data defined\n"); |
09113aea | 133 | return -EINVAL; |
4a15235e WZ |
134 | } |
135 | ||
903b9124 JL |
136 | keymap_data = pdata->keymap_data; |
137 | ||
4a15235e WZ |
138 | irq = platform_get_irq(pdev, 0); |
139 | if (irq < 0) { | |
140 | dev_err(&pdev->dev, "failed to get keypad irq\n"); | |
09113aea DT |
141 | return -ENXIO; |
142 | } | |
143 | ||
144 | keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL); | |
145 | input_dev = input_allocate_device(); | |
146 | if (!keypad || !input_dev) { | |
147 | dev_err(&pdev->dev, "failed to allocate driver data\n"); | |
148 | error = -ENOMEM; | |
4a15235e WZ |
149 | goto failed_free; |
150 | } | |
151 | ||
09113aea DT |
152 | keypad->pdata = pdata; |
153 | keypad->input_dev = input_dev; | |
154 | keypad->irq = irq; | |
155 | ||
4a15235e WZ |
156 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
157 | if (res == NULL) { | |
158 | dev_err(&pdev->dev, "failed to get I/O memory\n"); | |
159 | error = -ENXIO; | |
160 | goto failed_free; | |
161 | } | |
162 | ||
163 | res = request_mem_region(res->start, resource_size(res), pdev->name); | |
164 | if (res == NULL) { | |
165 | dev_err(&pdev->dev, "failed to request I/O memory\n"); | |
166 | error = -EBUSY; | |
167 | goto failed_free; | |
168 | } | |
169 | ||
170 | keypad->mmio_base = ioremap(res->start, resource_size(res)); | |
171 | if (keypad->mmio_base == NULL) { | |
172 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); | |
173 | error = -ENXIO; | |
09113aea | 174 | goto failed_free_res; |
4a15235e WZ |
175 | } |
176 | ||
177 | keypad->clk = clk_get(&pdev->dev, NULL); | |
178 | if (IS_ERR(keypad->clk)) { | |
179 | dev_err(&pdev->dev, "failed to get keypad clock\n"); | |
180 | error = PTR_ERR(keypad->clk); | |
181 | goto failed_free_io; | |
182 | } | |
183 | ||
4a15235e WZ |
184 | /* set multi-function pin for w90p910 kpi. */ |
185 | mfp_set_groupi(&pdev->dev); | |
186 | ||
187 | input_dev->name = pdev->name; | |
188 | input_dev->id.bustype = BUS_HOST; | |
189 | input_dev->open = w90p910_keypad_open; | |
190 | input_dev->close = w90p910_keypad_close; | |
191 | input_dev->dev.parent = &pdev->dev; | |
4a15235e | 192 | |
09113aea DT |
193 | input_dev->keycode = keypad->keymap; |
194 | input_dev->keycodesize = sizeof(keypad->keymap[0]); | |
195 | input_dev->keycodemax = ARRAY_SIZE(keypad->keymap); | |
196 | ||
4a15235e WZ |
197 | input_set_drvdata(input_dev, keypad); |
198 | ||
199 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); | |
09113aea DT |
200 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
201 | ||
77a53fd2 DT |
202 | matrix_keypad_build_keymap(keymap_data, W90P910_ROW_SHIFT, |
203 | input_dev->keycode, input_dev->keybit); | |
4a15235e | 204 | |
09113aea DT |
205 | error = request_irq(keypad->irq, w90p910_keypad_irq_handler, |
206 | IRQF_DISABLED, pdev->name, keypad); | |
4a15235e WZ |
207 | if (error) { |
208 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
09113aea | 209 | goto failed_put_clk; |
4a15235e WZ |
210 | } |
211 | ||
4a15235e WZ |
212 | /* Register the input device */ |
213 | error = input_register_device(input_dev); | |
214 | if (error) { | |
215 | dev_err(&pdev->dev, "failed to register input device\n"); | |
216 | goto failed_free_irq; | |
217 | } | |
218 | ||
09113aea | 219 | platform_set_drvdata(pdev, keypad); |
4a15235e WZ |
220 | return 0; |
221 | ||
222 | failed_free_irq: | |
223 | free_irq(irq, pdev); | |
4a15235e WZ |
224 | failed_put_clk: |
225 | clk_put(keypad->clk); | |
226 | failed_free_io: | |
227 | iounmap(keypad->mmio_base); | |
09113aea | 228 | failed_free_res: |
4a15235e WZ |
229 | release_mem_region(res->start, resource_size(res)); |
230 | failed_free: | |
09113aea | 231 | input_free_device(input_dev); |
4a15235e WZ |
232 | kfree(keypad); |
233 | return error; | |
234 | } | |
235 | ||
236 | static int __devexit w90p910_keypad_remove(struct platform_device *pdev) | |
237 | { | |
238 | struct w90p910_keypad *keypad = platform_get_drvdata(pdev); | |
239 | struct resource *res; | |
240 | ||
241 | free_irq(keypad->irq, pdev); | |
242 | ||
243 | clk_put(keypad->clk); | |
244 | ||
245 | input_unregister_device(keypad->input_dev); | |
246 | ||
247 | iounmap(keypad->mmio_base); | |
4a15235e WZ |
248 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
249 | release_mem_region(res->start, resource_size(res)); | |
250 | ||
251 | platform_set_drvdata(pdev, NULL); | |
252 | kfree(keypad); | |
09113aea | 253 | |
4a15235e WZ |
254 | return 0; |
255 | } | |
256 | ||
257 | static struct platform_driver w90p910_keypad_driver = { | |
258 | .probe = w90p910_keypad_probe, | |
259 | .remove = __devexit_p(w90p910_keypad_remove), | |
260 | .driver = { | |
fb962e1e | 261 | .name = "nuc900-keypad", |
4a15235e WZ |
262 | .owner = THIS_MODULE, |
263 | }, | |
264 | }; | |
265 | ||
266 | static int __init w90p910_keypad_init(void) | |
267 | { | |
268 | return platform_driver_register(&w90p910_keypad_driver); | |
269 | } | |
270 | ||
271 | static void __exit w90p910_keypad_exit(void) | |
272 | { | |
273 | platform_driver_unregister(&w90p910_keypad_driver); | |
274 | } | |
275 | ||
276 | module_init(w90p910_keypad_init); | |
277 | module_exit(w90p910_keypad_exit); | |
278 | ||
279 | MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); | |
fb962e1e | 280 | MODULE_DESCRIPTION("w90p910 keypad driver"); |
4a15235e | 281 | MODULE_LICENSE("GPL"); |
fb962e1e | 282 | MODULE_ALIAS("platform:nuc900-keypad"); |