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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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
48329582 MH |
17 | |
18 | #include <asm/portmux.h> | |
19 | #include <asm/bfin_rotary.h> | |
20 | ||
21 | static const u16 per_cnt[] = { | |
22 | P_CNT_CUD, | |
23 | P_CNT_CDG, | |
24 | P_CNT_CZM, | |
25 | 0 | |
26 | }; | |
27 | ||
28 | struct bfin_rot { | |
29 | struct input_dev *input; | |
30 | int irq; | |
31 | unsigned int up_key; | |
32 | unsigned int down_key; | |
33 | unsigned int button_key; | |
34 | unsigned int rel_code; | |
35 | unsigned short cnt_config; | |
36 | unsigned short cnt_imask; | |
37 | unsigned short cnt_debounce; | |
38 | }; | |
39 | ||
40 | static void report_key_event(struct input_dev *input, int keycode) | |
41 | { | |
42 | /* simulate a press-n-release */ | |
43 | input_report_key(input, keycode, 1); | |
44 | input_sync(input); | |
45 | input_report_key(input, keycode, 0); | |
46 | input_sync(input); | |
47 | } | |
48 | ||
49 | static void report_rotary_event(struct bfin_rot *rotary, int delta) | |
50 | { | |
51 | struct input_dev *input = rotary->input; | |
52 | ||
53 | if (rotary->up_key) { | |
54 | report_key_event(input, | |
55 | delta > 0 ? rotary->up_key : rotary->down_key); | |
56 | } else { | |
57 | input_report_rel(input, rotary->rel_code, delta); | |
58 | input_sync(input); | |
59 | } | |
60 | } | |
61 | ||
62 | static irqreturn_t bfin_rotary_isr(int irq, void *dev_id) | |
63 | { | |
64 | struct platform_device *pdev = dev_id; | |
65 | struct bfin_rot *rotary = platform_get_drvdata(pdev); | |
66 | int delta; | |
67 | ||
68 | switch (bfin_read_CNT_STATUS()) { | |
69 | ||
70 | case ICII: | |
71 | break; | |
72 | ||
73 | case UCII: | |
74 | case DCII: | |
75 | delta = bfin_read_CNT_COUNTER(); | |
76 | if (delta) | |
77 | report_rotary_event(rotary, delta); | |
78 | break; | |
79 | ||
80 | case CZMII: | |
81 | report_key_event(rotary->input, rotary->button_key); | |
82 | break; | |
83 | ||
84 | default: | |
85 | break; | |
86 | } | |
87 | ||
88 | bfin_write_CNT_COMMAND(W1LCNT_ZERO); /* Clear COUNTER */ | |
89 | bfin_write_CNT_STATUS(-1); /* Clear STATUS */ | |
90 | ||
91 | return IRQ_HANDLED; | |
92 | } | |
93 | ||
94 | static int __devinit bfin_rotary_probe(struct platform_device *pdev) | |
95 | { | |
96 | struct bfin_rotary_platform_data *pdata = pdev->dev.platform_data; | |
97 | struct bfin_rot *rotary; | |
98 | struct input_dev *input; | |
99 | int error; | |
100 | ||
101 | /* Basic validation */ | |
102 | if ((pdata->rotary_up_key && !pdata->rotary_down_key) || | |
103 | (!pdata->rotary_up_key && pdata->rotary_down_key)) { | |
104 | return -EINVAL; | |
105 | } | |
106 | ||
107 | error = peripheral_request_list(per_cnt, dev_name(&pdev->dev)); | |
108 | if (error) { | |
109 | dev_err(&pdev->dev, "requesting peripherals failed\n"); | |
110 | return error; | |
111 | } | |
112 | ||
113 | rotary = kzalloc(sizeof(struct bfin_rot), GFP_KERNEL); | |
114 | input = input_allocate_device(); | |
115 | if (!rotary || !input) { | |
116 | error = -ENOMEM; | |
117 | goto out1; | |
118 | } | |
119 | ||
120 | rotary->input = input; | |
121 | ||
122 | rotary->up_key = pdata->rotary_up_key; | |
123 | rotary->down_key = pdata->rotary_down_key; | |
124 | rotary->button_key = pdata->rotary_button_key; | |
125 | rotary->rel_code = pdata->rotary_rel_code; | |
126 | ||
127 | error = rotary->irq = platform_get_irq(pdev, 0); | |
128 | if (error < 0) | |
129 | goto out1; | |
130 | ||
131 | input->name = pdev->name; | |
132 | input->phys = "bfin-rotary/input0"; | |
133 | input->dev.parent = &pdev->dev; | |
134 | ||
135 | input_set_drvdata(input, rotary); | |
136 | ||
137 | input->id.bustype = BUS_HOST; | |
138 | input->id.vendor = 0x0001; | |
139 | input->id.product = 0x0001; | |
140 | input->id.version = 0x0100; | |
141 | ||
142 | if (rotary->up_key) { | |
143 | __set_bit(EV_KEY, input->evbit); | |
144 | __set_bit(rotary->up_key, input->keybit); | |
145 | __set_bit(rotary->down_key, input->keybit); | |
146 | } else { | |
147 | __set_bit(EV_REL, input->evbit); | |
148 | __set_bit(rotary->rel_code, input->relbit); | |
149 | } | |
150 | ||
151 | if (rotary->button_key) { | |
152 | __set_bit(EV_KEY, input->evbit); | |
153 | __set_bit(rotary->button_key, input->keybit); | |
154 | } | |
155 | ||
156 | error = request_irq(rotary->irq, bfin_rotary_isr, | |
157 | 0, dev_name(&pdev->dev), pdev); | |
158 | if (error) { | |
159 | dev_err(&pdev->dev, | |
160 | "unable to claim irq %d; error %d\n", | |
161 | rotary->irq, error); | |
162 | goto out1; | |
163 | } | |
164 | ||
165 | error = input_register_device(input); | |
166 | if (error) { | |
167 | dev_err(&pdev->dev, | |
168 | "unable to register input device (%d)\n", error); | |
169 | goto out2; | |
170 | } | |
171 | ||
172 | if (pdata->rotary_button_key) | |
173 | bfin_write_CNT_IMASK(CZMIE); | |
174 | ||
175 | if (pdata->mode & ROT_DEBE) | |
176 | bfin_write_CNT_DEBOUNCE(pdata->debounce & DPRESCALE); | |
177 | ||
178 | if (pdata->mode) | |
179 | bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() | | |
180 | (pdata->mode & ~CNTE)); | |
181 | ||
182 | bfin_write_CNT_IMASK(bfin_read_CNT_IMASK() | UCIE | DCIE); | |
183 | bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() | CNTE); | |
184 | ||
185 | platform_set_drvdata(pdev, rotary); | |
186 | device_init_wakeup(&pdev->dev, 1); | |
187 | ||
188 | return 0; | |
189 | ||
190 | out2: | |
191 | free_irq(rotary->irq, pdev); | |
192 | out1: | |
193 | input_free_device(input); | |
194 | kfree(rotary); | |
195 | peripheral_free_list(per_cnt); | |
196 | ||
197 | return error; | |
198 | } | |
199 | ||
200 | static int __devexit bfin_rotary_remove(struct platform_device *pdev) | |
201 | { | |
202 | struct bfin_rot *rotary = platform_get_drvdata(pdev); | |
203 | ||
204 | bfin_write_CNT_CONFIG(0); | |
205 | bfin_write_CNT_IMASK(0); | |
206 | ||
207 | free_irq(rotary->irq, pdev); | |
208 | input_unregister_device(rotary->input); | |
209 | peripheral_free_list(per_cnt); | |
210 | ||
211 | kfree(rotary); | |
212 | platform_set_drvdata(pdev, NULL); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | #ifdef CONFIG_PM | |
218 | static int bfin_rotary_suspend(struct device *dev) | |
219 | { | |
220 | struct platform_device *pdev = to_platform_device(dev); | |
221 | struct bfin_rot *rotary = platform_get_drvdata(pdev); | |
222 | ||
223 | rotary->cnt_config = bfin_read_CNT_CONFIG(); | |
224 | rotary->cnt_imask = bfin_read_CNT_IMASK(); | |
225 | rotary->cnt_debounce = bfin_read_CNT_DEBOUNCE(); | |
226 | ||
227 | if (device_may_wakeup(&pdev->dev)) | |
228 | enable_irq_wake(rotary->irq); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static int bfin_rotary_resume(struct device *dev) | |
234 | { | |
235 | struct platform_device *pdev = to_platform_device(dev); | |
236 | struct bfin_rot *rotary = platform_get_drvdata(pdev); | |
237 | ||
238 | bfin_write_CNT_DEBOUNCE(rotary->cnt_debounce); | |
239 | bfin_write_CNT_IMASK(rotary->cnt_imask); | |
240 | bfin_write_CNT_CONFIG(rotary->cnt_config & ~CNTE); | |
241 | ||
242 | if (device_may_wakeup(&pdev->dev)) | |
243 | disable_irq_wake(rotary->irq); | |
244 | ||
245 | if (rotary->cnt_config & CNTE) | |
246 | bfin_write_CNT_CONFIG(rotary->cnt_config); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
47145210 | 251 | static const struct dev_pm_ops bfin_rotary_pm_ops = { |
48329582 MH |
252 | .suspend = bfin_rotary_suspend, |
253 | .resume = bfin_rotary_resume, | |
254 | }; | |
255 | #endif | |
256 | ||
257 | static struct platform_driver bfin_rotary_device_driver = { | |
258 | .probe = bfin_rotary_probe, | |
259 | .remove = __devexit_p(bfin_rotary_remove), | |
260 | .driver = { | |
261 | .name = "bfin-rotary", | |
262 | .owner = THIS_MODULE, | |
263 | #ifdef CONFIG_PM | |
264 | .pm = &bfin_rotary_pm_ops, | |
265 | #endif | |
266 | }, | |
267 | }; | |
268 | ||
269 | static int __init bfin_rotary_init(void) | |
270 | { | |
271 | return platform_driver_register(&bfin_rotary_device_driver); | |
272 | } | |
273 | module_init(bfin_rotary_init); | |
274 | ||
275 | static void __exit bfin_rotary_exit(void) | |
276 | { | |
277 | platform_driver_unregister(&bfin_rotary_device_driver); | |
278 | } | |
279 | module_exit(bfin_rotary_exit); | |
280 | ||
281 | MODULE_LICENSE("GPL"); | |
282 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
283 | MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors"); | |
284 | MODULE_ALIAS("platform:bfin-rotary"); |