tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Driver for PC-speaker like devices found on various Sparc systems.
3 *
4 * Copyright (c) 2002 Vojtech Pavlik
5 * Copyright (c) 2002, 2006, 2008 David S. Miller (davem@davemloft.net)
6 */
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/input.h>
11#include <linux/of_device.h>
12#include <linux/slab.h>
13
14#include <asm/io.h>
15
16MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
17MODULE_DESCRIPTION("Sparc Speaker beeper driver");
18MODULE_LICENSE("GPL");
19
20struct grover_beep_info {
21 void __iomem *freq_regs;
22 void __iomem *enable_reg;
23};
24
25struct bbc_beep_info {
26 u32 clock_freq;
27 void __iomem *regs;
28};
29
30struct sparcspkr_state {
31 const char *name;
32 int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
33 spinlock_t lock;
34 struct input_dev *input_dev;
35 union {
36 struct grover_beep_info grover;
37 struct bbc_beep_info bbc;
38 } u;
39};
40
41static u32 bbc_count_to_reg(struct bbc_beep_info *info, unsigned int count)
42{
43 u32 val, clock_freq = info->clock_freq;
44 int i;
45
46 if (!count)
47 return 0;
48
49 if (count <= clock_freq >> 20)
50 return 1 << 18;
51
52 if (count >= clock_freq >> 12)
53 return 1 << 10;
54
55 val = 1 << 18;
56 for (i = 19; i >= 11; i--) {
57 val >>= 1;
58 if (count <= clock_freq >> i)
59 break;
60 }
61
62 return val;
63}
64
65static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
66{
67 struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
68 struct bbc_beep_info *info = &state->u.bbc;
69 unsigned int count = 0;
70 unsigned long flags;
71
72 if (type != EV_SND)
73 return -1;
74
75 switch (code) {
76 case SND_BELL: if (value) value = 1000;
77 case SND_TONE: break;
78 default: return -1;
79 }
80
81 if (value > 20 && value < 32767)
82 count = 1193182 / value;
83
84 count = bbc_count_to_reg(info, count);
85
86 spin_lock_irqsave(&state->lock, flags);
87
88 if (count) {
89 outb(0x01, info->regs + 0);
90 outb(0x00, info->regs + 2);
91 outb((count >> 16) & 0xff, info->regs + 3);
92 outb((count >> 8) & 0xff, info->regs + 4);
93 outb(0x00, info->regs + 5);
94 } else {
95 outb(0x00, info->regs + 0);
96 }
97
98 spin_unlock_irqrestore(&state->lock, flags);
99
100 return 0;
101}
102
103static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
104{
105 struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
106 struct grover_beep_info *info = &state->u.grover;
107 unsigned int count = 0;
108 unsigned long flags;
109
110 if (type != EV_SND)
111 return -1;
112
113 switch (code) {
114 case SND_BELL: if (value) value = 1000;
115 case SND_TONE: break;
116 default: return -1;
117 }
118
119 if (value > 20 && value < 32767)
120 count = 1193182 / value;
121
122 spin_lock_irqsave(&state->lock, flags);
123
124 if (count) {
125 /* enable counter 2 */
126 outb(inb(info->enable_reg) | 3, info->enable_reg);
127 /* set command for counter 2, 2 byte write */
128 outb(0xB6, info->freq_regs + 1);
129 /* select desired HZ */
130 outb(count & 0xff, info->freq_regs + 0);
131 outb((count >> 8) & 0xff, info->freq_regs + 0);
132 } else {
133 /* disable counter 2 */
134 outb(inb_p(info->enable_reg) & 0xFC, info->enable_reg);
135 }
136
137 spin_unlock_irqrestore(&state->lock, flags);
138
139 return 0;
140}
141
142static int __devinit sparcspkr_probe(struct device *dev)
143{
144 struct sparcspkr_state *state = dev_get_drvdata(dev);
145 struct input_dev *input_dev;
146 int error;
147
148 input_dev = input_allocate_device();
149 if (!input_dev)
150 return -ENOMEM;
151
152 input_dev->name = state->name;
153 input_dev->phys = "sparc/input0";
154 input_dev->id.bustype = BUS_ISA;
155 input_dev->id.vendor = 0x001f;
156 input_dev->id.product = 0x0001;
157 input_dev->id.version = 0x0100;
158 input_dev->dev.parent = dev;
159
160 input_dev->evbit[0] = BIT_MASK(EV_SND);
161 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
162
163 input_dev->event = state->event;
164
165 error = input_register_device(input_dev);
166 if (error) {
167 input_free_device(input_dev);
168 return error;
169 }
170
171 state->input_dev = input_dev;
172
173 return 0;
174}
175
176static int sparcspkr_shutdown(struct platform_device *dev)
177{
178 struct sparcspkr_state *state = dev_get_drvdata(&dev->dev);
179 struct input_dev *input_dev = state->input_dev;
180
181 /* turn off the speaker */
182 state->event(input_dev, EV_SND, SND_BELL, 0);
183
184 return 0;
185}
186
187static int __devinit bbc_beep_probe(struct platform_device *op, const struct of_device_id *match)
188{
189 struct sparcspkr_state *state;
190 struct bbc_beep_info *info;
191 struct device_node *dp;
192 int err = -ENOMEM;
193
194 state = kzalloc(sizeof(*state), GFP_KERNEL);
195 if (!state)
196 goto out_err;
197
198 state->name = "Sparc BBC Speaker";
199 state->event = bbc_spkr_event;
200 spin_lock_init(&state->lock);
201
202 dp = of_find_node_by_path("/");
203 err = -ENODEV;
204 if (!dp)
205 goto out_free;
206
207 info = &state->u.bbc;
208 info->clock_freq = of_getintprop_default(dp, "clock-frequency", 0);
209 if (!info->clock_freq)
210 goto out_free;
211
212 info->regs = of_ioremap(&op->resource[0], 0, 6, "bbc beep");
213 if (!info->regs)
214 goto out_free;
215
216 dev_set_drvdata(&op->dev, state);
217
218 err = sparcspkr_probe(&op->dev);
219 if (err)
220 goto out_clear_drvdata;
221
222 return 0;
223
224out_clear_drvdata:
225 dev_set_drvdata(&op->dev, NULL);
226 of_iounmap(&op->resource[0], info->regs, 6);
227
228out_free:
229 kfree(state);
230out_err:
231 return err;
232}
233
234static int __devexit bbc_remove(struct platform_device *op)
235{
236 struct sparcspkr_state *state = dev_get_drvdata(&op->dev);
237 struct input_dev *input_dev = state->input_dev;
238 struct bbc_beep_info *info = &state->u.bbc;
239
240 /* turn off the speaker */
241 state->event(input_dev, EV_SND, SND_BELL, 0);
242
243 input_unregister_device(input_dev);
244
245 of_iounmap(&op->resource[0], info->regs, 6);
246
247 dev_set_drvdata(&op->dev, NULL);
248 kfree(state);
249
250 return 0;
251}
252
253static const struct of_device_id bbc_beep_match[] = {
254 {
255 .name = "beep",
256 .compatible = "SUNW,bbc-beep",
257 },
258 {},
259};
260
261static struct of_platform_driver bbc_beep_driver = {
262 .driver = {
263 .name = "bbcbeep",
264 .owner = THIS_MODULE,
265 .of_match_table = bbc_beep_match,
266 },
267 .probe = bbc_beep_probe,
268 .remove = __devexit_p(bbc_remove),
269 .shutdown = sparcspkr_shutdown,
270};
271
272static int __devinit grover_beep_probe(struct platform_device *op, const struct of_device_id *match)
273{
274 struct sparcspkr_state *state;
275 struct grover_beep_info *info;
276 int err = -ENOMEM;
277
278 state = kzalloc(sizeof(*state), GFP_KERNEL);
279 if (!state)
280 goto out_err;
281
282 state->name = "Sparc Grover Speaker";
283 state->event = grover_spkr_event;
284 spin_lock_init(&state->lock);
285
286 info = &state->u.grover;
287 info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq");
288 if (!info->freq_regs)
289 goto out_free;
290
291 info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable");
292 if (!info->enable_reg)
293 goto out_unmap_freq_regs;
294
295 dev_set_drvdata(&op->dev, state);
296
297 err = sparcspkr_probe(&op->dev);
298 if (err)
299 goto out_clear_drvdata;
300
301 return 0;
302
303out_clear_drvdata:
304 dev_set_drvdata(&op->dev, NULL);
305 of_iounmap(&op->resource[3], info->enable_reg, 1);
306
307out_unmap_freq_regs:
308 of_iounmap(&op->resource[2], info->freq_regs, 2);
309out_free:
310 kfree(state);
311out_err:
312 return err;
313}
314
315static int __devexit grover_remove(struct platform_device *op)
316{
317 struct sparcspkr_state *state = dev_get_drvdata(&op->dev);
318 struct grover_beep_info *info = &state->u.grover;
319 struct input_dev *input_dev = state->input_dev;
320
321 /* turn off the speaker */
322 state->event(input_dev, EV_SND, SND_BELL, 0);
323
324 input_unregister_device(input_dev);
325
326 of_iounmap(&op->resource[3], info->enable_reg, 1);
327 of_iounmap(&op->resource[2], info->freq_regs, 2);
328
329 dev_set_drvdata(&op->dev, NULL);
330 kfree(state);
331
332 return 0;
333}
334
335static const struct of_device_id grover_beep_match[] = {
336 {
337 .name = "beep",
338 .compatible = "SUNW,smbus-beep",
339 },
340 {},
341};
342
343static struct of_platform_driver grover_beep_driver = {
344 .driver = {
345 .name = "groverbeep",
346 .owner = THIS_MODULE,
347 .of_match_table = grover_beep_match,
348 },
349 .probe = grover_beep_probe,
350 .remove = __devexit_p(grover_remove),
351 .shutdown = sparcspkr_shutdown,
352};
353
354static int __init sparcspkr_init(void)
355{
356 int err = of_register_platform_driver(&bbc_beep_driver);
357
358 if (!err) {
359 err = of_register_platform_driver(&grover_beep_driver);
360 if (err)
361 of_unregister_platform_driver(&bbc_beep_driver);
362 }
363
364 return err;
365}
366
367static void __exit sparcspkr_exit(void)
368{
369 of_unregister_platform_driver(&bbc_beep_driver);
370 of_unregister_platform_driver(&grover_beep_driver);
371}
372
373module_init(sparcspkr_init);
374module_exit(sparcspkr_exit);