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48329582 MH |
1 | /* |
2 | * Rotary counter driver for Analog Devices Blackfin Processors | |
3 | * | |
4 | * Copyright 2008-2009 Analog Devices Inc. | |
5 | * Licensed under the GPL-2 or later. | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/version.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/irq.h> | |
13 | #include <linux/pm.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/input.h> | |
16 | ||
17 | #include <asm/portmux.h> | |
18 | #include <asm/bfin_rotary.h> | |
19 | ||
20 | static const u16 per_cnt[] = { | |
21 | P_CNT_CUD, | |
22 | P_CNT_CDG, | |
23 | P_CNT_CZM, | |
24 | 0 | |
25 | }; | |
26 | ||
27 | struct bfin_rot { | |
28 | struct input_dev *input; | |
29 | int irq; | |
30 | unsigned int up_key; | |
31 | unsigned int down_key; | |
32 | unsigned int button_key; | |
33 | unsigned int rel_code; | |
34 | unsigned short cnt_config; | |
35 | unsigned short cnt_imask; | |
36 | unsigned short cnt_debounce; | |
37 | }; | |
38 | ||
39 | static void report_key_event(struct input_dev *input, int keycode) | |
40 | { | |
41 | /* simulate a press-n-release */ | |
42 | input_report_key(input, keycode, 1); | |
43 | input_sync(input); | |
44 | input_report_key(input, keycode, 0); | |
45 | input_sync(input); | |
46 | } | |
47 | ||
48 | static void report_rotary_event(struct bfin_rot *rotary, int delta) | |
49 | { | |
50 | struct input_dev *input = rotary->input; | |
51 | ||
52 | if (rotary->up_key) { | |
53 | report_key_event(input, | |
54 | delta > 0 ? rotary->up_key : rotary->down_key); | |
55 | } else { | |
56 | input_report_rel(input, rotary->rel_code, delta); | |
57 | input_sync(input); | |
58 | } | |
59 | } | |
60 | ||
61 | static irqreturn_t bfin_rotary_isr(int irq, void *dev_id) | |
62 | { | |
63 | struct platform_device *pdev = dev_id; | |
64 | struct bfin_rot *rotary = platform_get_drvdata(pdev); | |
65 | int delta; | |
66 | ||
67 | switch (bfin_read_CNT_STATUS()) { | |
68 | ||
69 | case ICII: | |
70 | break; | |
71 | ||
72 | case UCII: | |
73 | case DCII: | |
74 | delta = bfin_read_CNT_COUNTER(); | |
75 | if (delta) | |
76 | report_rotary_event(rotary, delta); | |
77 | break; | |
78 | ||
79 | case CZMII: | |
80 | report_key_event(rotary->input, rotary->button_key); | |
81 | break; | |
82 | ||
83 | default: | |
84 | break; | |
85 | } | |
86 | ||
87 | bfin_write_CNT_COMMAND(W1LCNT_ZERO); /* Clear COUNTER */ | |
88 | bfin_write_CNT_STATUS(-1); /* Clear STATUS */ | |
89 | ||
90 | return IRQ_HANDLED; | |
91 | } | |
92 | ||
93 | static int __devinit bfin_rotary_probe(struct platform_device *pdev) | |
94 | { | |
95 | struct bfin_rotary_platform_data *pdata = pdev->dev.platform_data; | |
96 | struct bfin_rot *rotary; | |
97 | struct input_dev *input; | |
98 | int error; | |
99 | ||
100 | /* Basic validation */ | |
101 | if ((pdata->rotary_up_key && !pdata->rotary_down_key) || | |
102 | (!pdata->rotary_up_key && pdata->rotary_down_key)) { | |
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | error = peripheral_request_list(per_cnt, dev_name(&pdev->dev)); | |
107 | if (error) { | |
108 | dev_err(&pdev->dev, "requesting peripherals failed\n"); | |
109 | return error; | |
110 | } | |
111 | ||
112 | rotary = kzalloc(sizeof(struct bfin_rot), GFP_KERNEL); | |
113 | input = input_allocate_device(); | |
114 | if (!rotary || !input) { | |
115 | error = -ENOMEM; | |
116 | goto out1; | |
117 | } | |
118 | ||
119 | rotary->input = input; | |
120 | ||
121 | rotary->up_key = pdata->rotary_up_key; | |
122 | rotary->down_key = pdata->rotary_down_key; | |
123 | rotary->button_key = pdata->rotary_button_key; | |
124 | rotary->rel_code = pdata->rotary_rel_code; | |
125 | ||
126 | error = rotary->irq = platform_get_irq(pdev, 0); | |
127 | if (error < 0) | |
128 | goto out1; | |
129 | ||
130 | input->name = pdev->name; | |
131 | input->phys = "bfin-rotary/input0"; | |
132 | input->dev.parent = &pdev->dev; | |
133 | ||
134 | input_set_drvdata(input, rotary); | |
135 | ||
136 | input->id.bustype = BUS_HOST; | |
137 | input->id.vendor = 0x0001; | |
138 | input->id.product = 0x0001; | |
139 | input->id.version = 0x0100; | |
140 | ||
141 | if (rotary->up_key) { | |
142 | __set_bit(EV_KEY, input->evbit); | |
143 | __set_bit(rotary->up_key, input->keybit); | |
144 | __set_bit(rotary->down_key, input->keybit); | |
145 | } else { | |
146 | __set_bit(EV_REL, input->evbit); | |
147 | __set_bit(rotary->rel_code, input->relbit); | |
148 | } | |
149 | ||
150 | if (rotary->button_key) { | |
151 | __set_bit(EV_KEY, input->evbit); | |
152 | __set_bit(rotary->button_key, input->keybit); | |
153 | } | |
154 | ||
155 | error = request_irq(rotary->irq, bfin_rotary_isr, | |
156 | 0, dev_name(&pdev->dev), pdev); | |
157 | if (error) { | |
158 | dev_err(&pdev->dev, | |
159 | "unable to claim irq %d; error %d\n", | |
160 | rotary->irq, error); | |
161 | goto out1; | |
162 | } | |
163 | ||
164 | error = input_register_device(input); | |
165 | if (error) { | |
166 | dev_err(&pdev->dev, | |
167 | "unable to register input device (%d)\n", error); | |
168 | goto out2; | |
169 | } | |
170 | ||
171 | if (pdata->rotary_button_key) | |
172 | bfin_write_CNT_IMASK(CZMIE); | |
173 | ||
174 | if (pdata->mode & ROT_DEBE) | |
175 | bfin_write_CNT_DEBOUNCE(pdata->debounce & DPRESCALE); | |
176 | ||
177 | if (pdata->mode) | |
178 | bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() | | |
179 | (pdata->mode & ~CNTE)); | |
180 | ||
181 | bfin_write_CNT_IMASK(bfin_read_CNT_IMASK() | UCIE | DCIE); | |
182 | bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() | CNTE); | |
183 | ||
184 | platform_set_drvdata(pdev, rotary); | |
185 | device_init_wakeup(&pdev->dev, 1); | |
186 | ||
187 | return 0; | |
188 | ||
189 | out2: | |
190 | free_irq(rotary->irq, pdev); | |
191 | out1: | |
192 | input_free_device(input); | |
193 | kfree(rotary); | |
194 | peripheral_free_list(per_cnt); | |
195 | ||
196 | return error; | |
197 | } | |
198 | ||
199 | static int __devexit bfin_rotary_remove(struct platform_device *pdev) | |
200 | { | |
201 | struct bfin_rot *rotary = platform_get_drvdata(pdev); | |
202 | ||
203 | bfin_write_CNT_CONFIG(0); | |
204 | bfin_write_CNT_IMASK(0); | |
205 | ||
206 | free_irq(rotary->irq, pdev); | |
207 | input_unregister_device(rotary->input); | |
208 | peripheral_free_list(per_cnt); | |
209 | ||
210 | kfree(rotary); | |
211 | platform_set_drvdata(pdev, NULL); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | #ifdef CONFIG_PM | |
217 | static int bfin_rotary_suspend(struct device *dev) | |
218 | { | |
219 | struct platform_device *pdev = to_platform_device(dev); | |
220 | struct bfin_rot *rotary = platform_get_drvdata(pdev); | |
221 | ||
222 | rotary->cnt_config = bfin_read_CNT_CONFIG(); | |
223 | rotary->cnt_imask = bfin_read_CNT_IMASK(); | |
224 | rotary->cnt_debounce = bfin_read_CNT_DEBOUNCE(); | |
225 | ||
226 | if (device_may_wakeup(&pdev->dev)) | |
227 | enable_irq_wake(rotary->irq); | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static int bfin_rotary_resume(struct device *dev) | |
233 | { | |
234 | struct platform_device *pdev = to_platform_device(dev); | |
235 | struct bfin_rot *rotary = platform_get_drvdata(pdev); | |
236 | ||
237 | bfin_write_CNT_DEBOUNCE(rotary->cnt_debounce); | |
238 | bfin_write_CNT_IMASK(rotary->cnt_imask); | |
239 | bfin_write_CNT_CONFIG(rotary->cnt_config & ~CNTE); | |
240 | ||
241 | if (device_may_wakeup(&pdev->dev)) | |
242 | disable_irq_wake(rotary->irq); | |
243 | ||
244 | if (rotary->cnt_config & CNTE) | |
245 | bfin_write_CNT_CONFIG(rotary->cnt_config); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | static struct dev_pm_ops bfin_rotary_pm_ops = { | |
251 | .suspend = bfin_rotary_suspend, | |
252 | .resume = bfin_rotary_resume, | |
253 | }; | |
254 | #endif | |
255 | ||
256 | static struct platform_driver bfin_rotary_device_driver = { | |
257 | .probe = bfin_rotary_probe, | |
258 | .remove = __devexit_p(bfin_rotary_remove), | |
259 | .driver = { | |
260 | .name = "bfin-rotary", | |
261 | .owner = THIS_MODULE, | |
262 | #ifdef CONFIG_PM | |
263 | .pm = &bfin_rotary_pm_ops, | |
264 | #endif | |
265 | }, | |
266 | }; | |
267 | ||
268 | static int __init bfin_rotary_init(void) | |
269 | { | |
270 | return platform_driver_register(&bfin_rotary_device_driver); | |
271 | } | |
272 | module_init(bfin_rotary_init); | |
273 | ||
274 | static void __exit bfin_rotary_exit(void) | |
275 | { | |
276 | platform_driver_unregister(&bfin_rotary_device_driver); | |
277 | } | |
278 | module_exit(bfin_rotary_exit); | |
279 | ||
280 | MODULE_LICENSE("GPL"); | |
281 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
282 | MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors"); | |
283 | MODULE_ALIAS("platform:bfin-rotary"); |