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