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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 | ||
1932811f DT |
45 | #define W90P910_NUM_ROWS 8 |
46 | #define W90P910_NUM_COLS 8 | |
09113aea | 47 | #define W90P910_ROW_SHIFT 3 |
4a15235e WZ |
48 | |
49 | struct w90p910_keypad { | |
09113aea | 50 | const struct w90p910_keypad_platform_data *pdata; |
4a15235e WZ |
51 | struct clk *clk; |
52 | struct input_dev *input_dev; | |
53 | void __iomem *mmio_base; | |
54 | int irq; | |
1932811f | 55 | unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS]; |
4a15235e WZ |
56 | }; |
57 | ||
4a15235e WZ |
58 | static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad, |
59 | unsigned int status) | |
60 | { | |
09113aea DT |
61 | struct input_dev *input_dev = keypad->input_dev; |
62 | unsigned int row = KGET_RAW(status); | |
63 | unsigned int col = KGET_COLUMN(status); | |
64 | unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT); | |
65 | unsigned int key = keypad->keymap[code]; | |
66 | ||
67 | input_event(input_dev, EV_MSC, MSC_SCAN, code); | |
68 | input_report_key(input_dev, key, 1); | |
69 | input_sync(input_dev); | |
70 | ||
71 | input_event(input_dev, EV_MSC, MSC_SCAN, code); | |
72 | input_report_key(input_dev, key, 0); | |
73 | input_sync(input_dev); | |
4a15235e WZ |
74 | } |
75 | ||
76 | static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id) | |
77 | { | |
78 | struct w90p910_keypad *keypad = dev_id; | |
79 | unsigned int kstatus, val; | |
80 | ||
81 | kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS); | |
82 | ||
83 | val = INTTR | IS1KEY; | |
84 | ||
85 | if (kstatus & val) | |
86 | w90p910_keypad_scan_matrix(keypad, kstatus); | |
87 | ||
88 | return IRQ_HANDLED; | |
89 | } | |
90 | ||
91 | static int w90p910_keypad_open(struct input_dev *dev) | |
92 | { | |
93 | struct w90p910_keypad *keypad = input_get_drvdata(dev); | |
09113aea | 94 | const struct w90p910_keypad_platform_data *pdata = keypad->pdata; |
4a15235e WZ |
95 | unsigned int val, config; |
96 | ||
97 | /* Enable unit clock */ | |
98 | clk_enable(keypad->clk); | |
99 | ||
100 | val = __raw_readl(keypad->mmio_base + KPI_CONF); | |
101 | val |= (KPSEL | ENKP); | |
102 | val &= ~(KSIZE0 | KSIZE1); | |
103 | ||
104 | config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT); | |
105 | ||
106 | val |= config; | |
107 | ||
108 | __raw_writel(val, keypad->mmio_base + KPI_CONF); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static void w90p910_keypad_close(struct input_dev *dev) | |
114 | { | |
115 | struct w90p910_keypad *keypad = input_get_drvdata(dev); | |
116 | ||
117 | /* Disable clock unit */ | |
118 | clk_disable(keypad->clk); | |
119 | } | |
120 | ||
121 | static int __devinit w90p910_keypad_probe(struct platform_device *pdev) | |
122 | { | |
09113aea DT |
123 | const struct w90p910_keypad_platform_data *pdata = |
124 | pdev->dev.platform_data; | |
903b9124 | 125 | const struct matrix_keymap_data *keymap_data; |
4a15235e WZ |
126 | struct w90p910_keypad *keypad; |
127 | struct input_dev *input_dev; | |
128 | struct resource *res; | |
09113aea DT |
129 | int irq; |
130 | int error; | |
4a15235e | 131 | |
09113aea | 132 | if (!pdata) { |
4a15235e | 133 | dev_err(&pdev->dev, "no platform data defined\n"); |
09113aea | 134 | return -EINVAL; |
4a15235e WZ |
135 | } |
136 | ||
903b9124 JL |
137 | keymap_data = pdata->keymap_data; |
138 | ||
4a15235e WZ |
139 | irq = platform_get_irq(pdev, 0); |
140 | if (irq < 0) { | |
141 | dev_err(&pdev->dev, "failed to get keypad irq\n"); | |
09113aea DT |
142 | return -ENXIO; |
143 | } | |
144 | ||
145 | keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL); | |
146 | input_dev = input_allocate_device(); | |
147 | if (!keypad || !input_dev) { | |
148 | dev_err(&pdev->dev, "failed to allocate driver data\n"); | |
149 | error = -ENOMEM; | |
4a15235e WZ |
150 | goto failed_free; |
151 | } | |
152 | ||
09113aea DT |
153 | keypad->pdata = pdata; |
154 | keypad->input_dev = input_dev; | |
155 | keypad->irq = irq; | |
156 | ||
4a15235e WZ |
157 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
158 | if (res == NULL) { | |
159 | dev_err(&pdev->dev, "failed to get I/O memory\n"); | |
160 | error = -ENXIO; | |
161 | goto failed_free; | |
162 | } | |
163 | ||
164 | res = request_mem_region(res->start, resource_size(res), pdev->name); | |
165 | if (res == NULL) { | |
166 | dev_err(&pdev->dev, "failed to request I/O memory\n"); | |
167 | error = -EBUSY; | |
168 | goto failed_free; | |
169 | } | |
170 | ||
171 | keypad->mmio_base = ioremap(res->start, resource_size(res)); | |
172 | if (keypad->mmio_base == NULL) { | |
173 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); | |
174 | error = -ENXIO; | |
09113aea | 175 | goto failed_free_res; |
4a15235e WZ |
176 | } |
177 | ||
178 | keypad->clk = clk_get(&pdev->dev, NULL); | |
179 | if (IS_ERR(keypad->clk)) { | |
180 | dev_err(&pdev->dev, "failed to get keypad clock\n"); | |
181 | error = PTR_ERR(keypad->clk); | |
182 | goto failed_free_io; | |
183 | } | |
184 | ||
4a15235e WZ |
185 | /* set multi-function pin for w90p910 kpi. */ |
186 | mfp_set_groupi(&pdev->dev); | |
187 | ||
188 | input_dev->name = pdev->name; | |
189 | input_dev->id.bustype = BUS_HOST; | |
190 | input_dev->open = w90p910_keypad_open; | |
191 | input_dev->close = w90p910_keypad_close; | |
192 | input_dev->dev.parent = &pdev->dev; | |
4a15235e | 193 | |
1932811f DT |
194 | error = matrix_keypad_build_keymap(keymap_data, NULL, |
195 | W90P910_NUM_ROWS, W90P910_NUM_COLS, | |
196 | keypad->keymap, input_dev); | |
197 | if (error) { | |
198 | dev_err(&pdev->dev, "failed to build keymap\n"); | |
199 | goto failed_put_clk; | |
200 | } | |
4a15235e | 201 | |
09113aea | 202 | error = request_irq(keypad->irq, w90p910_keypad_irq_handler, |
ec4665c4 | 203 | 0, pdev->name, keypad); |
4a15235e WZ |
204 | if (error) { |
205 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
09113aea | 206 | goto failed_put_clk; |
4a15235e WZ |
207 | } |
208 | ||
1932811f DT |
209 | __set_bit(EV_REP, input_dev->evbit); |
210 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); | |
211 | input_set_drvdata(input_dev, keypad); | |
212 | ||
4a15235e WZ |
213 | /* Register the input device */ |
214 | error = input_register_device(input_dev); | |
215 | if (error) { | |
216 | dev_err(&pdev->dev, "failed to register input device\n"); | |
217 | goto failed_free_irq; | |
218 | } | |
219 | ||
09113aea | 220 | platform_set_drvdata(pdev, keypad); |
4a15235e WZ |
221 | return 0; |
222 | ||
223 | failed_free_irq: | |
224 | free_irq(irq, pdev); | |
4a15235e WZ |
225 | failed_put_clk: |
226 | clk_put(keypad->clk); | |
227 | failed_free_io: | |
228 | iounmap(keypad->mmio_base); | |
09113aea | 229 | failed_free_res: |
4a15235e WZ |
230 | release_mem_region(res->start, resource_size(res)); |
231 | failed_free: | |
09113aea | 232 | input_free_device(input_dev); |
4a15235e WZ |
233 | kfree(keypad); |
234 | return error; | |
235 | } | |
236 | ||
237 | static int __devexit w90p910_keypad_remove(struct platform_device *pdev) | |
238 | { | |
239 | struct w90p910_keypad *keypad = platform_get_drvdata(pdev); | |
240 | struct resource *res; | |
241 | ||
242 | free_irq(keypad->irq, pdev); | |
243 | ||
244 | clk_put(keypad->clk); | |
245 | ||
246 | input_unregister_device(keypad->input_dev); | |
247 | ||
248 | iounmap(keypad->mmio_base); | |
4a15235e WZ |
249 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
250 | release_mem_region(res->start, resource_size(res)); | |
251 | ||
252 | platform_set_drvdata(pdev, NULL); | |
253 | kfree(keypad); | |
09113aea | 254 | |
4a15235e WZ |
255 | return 0; |
256 | } | |
257 | ||
258 | static struct platform_driver w90p910_keypad_driver = { | |
259 | .probe = w90p910_keypad_probe, | |
260 | .remove = __devexit_p(w90p910_keypad_remove), | |
261 | .driver = { | |
1afaab90 | 262 | .name = "nuc900-kpi", |
4a15235e WZ |
263 | .owner = THIS_MODULE, |
264 | }, | |
265 | }; | |
5146c84f | 266 | module_platform_driver(w90p910_keypad_driver); |
4a15235e WZ |
267 | |
268 | MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); | |
fb962e1e | 269 | MODULE_DESCRIPTION("w90p910 keypad driver"); |
4a15235e | 270 | MODULE_LICENSE("GPL"); |
fb962e1e | 271 | MODULE_ALIAS("platform:nuc900-keypad"); |