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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 sbus_writeb(0x01, info->regs + 0);
90 sbus_writeb(0x00, info->regs + 2);
91 sbus_writeb((count >> 16) & 0xff, info->regs + 3);
92 sbus_writeb((count >> 8) & 0xff, info->regs + 4);
93 sbus_writeb(0x00, info->regs + 5);
94 } else {
95 sbus_writeb(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 sbus_writeb(sbus_readb(info->enable_reg) | 3, info->enable_reg);
127 /* set command for counter 2, 2 byte write */
128 sbus_writeb(0xB6, info->freq_regs + 1);
129 /* select desired HZ */
130 sbus_writeb(count & 0xff, info->freq_regs + 0);
131 sbus_writeb((count >> 8) & 0xff, info->freq_regs + 0);
132 } else {
133 /* disable counter 2 */
134 sbus_writeb(sbus_readb(info->enable_reg) & 0xFC, info->enable_reg);
135 }
136
137 spin_unlock_irqrestore(&state->lock, flags);
138
139 return 0;
140}
141
142static int 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 void sparcspkr_shutdown(struct platform_device *dev)
177{
178 struct sparcspkr_state *state = platform_get_drvdata(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
185static int bbc_beep_probe(struct platform_device *op)
186{
187 struct sparcspkr_state *state;
188 struct bbc_beep_info *info;
189 struct device_node *dp;
190 int err = -ENOMEM;
191
192 state = kzalloc(sizeof(*state), GFP_KERNEL);
193 if (!state)
194 goto out_err;
195
196 state->name = "Sparc BBC Speaker";
197 state->event = bbc_spkr_event;
198 spin_lock_init(&state->lock);
199
200 dp = of_find_node_by_path("/");
201 err = -ENODEV;
202 if (!dp)
203 goto out_free;
204
205 info = &state->u.bbc;
206 info->clock_freq = of_getintprop_default(dp, "clock-frequency", 0);
207 if (!info->clock_freq)
208 goto out_free;
209
210 info->regs = of_ioremap(&op->resource[0], 0, 6, "bbc beep");
211 if (!info->regs)
212 goto out_free;
213
214 platform_set_drvdata(op, state);
215
216 err = sparcspkr_probe(&op->dev);
217 if (err)
218 goto out_clear_drvdata;
219
220 return 0;
221
222out_clear_drvdata:
223 of_iounmap(&op->resource[0], info->regs, 6);
224
225out_free:
226 kfree(state);
227out_err:
228 return err;
229}
230
231static int bbc_remove(struct platform_device *op)
232{
233 struct sparcspkr_state *state = platform_get_drvdata(op);
234 struct input_dev *input_dev = state->input_dev;
235 struct bbc_beep_info *info = &state->u.bbc;
236
237 /* turn off the speaker */
238 state->event(input_dev, EV_SND, SND_BELL, 0);
239
240 input_unregister_device(input_dev);
241
242 of_iounmap(&op->resource[0], info->regs, 6);
243
244 kfree(state);
245
246 return 0;
247}
248
249static const struct of_device_id bbc_beep_match[] = {
250 {
251 .name = "beep",
252 .compatible = "SUNW,bbc-beep",
253 },
254 {},
255};
256MODULE_DEVICE_TABLE(of, bbc_beep_match);
257
258static struct platform_driver bbc_beep_driver = {
259 .driver = {
260 .name = "bbcbeep",
261 .of_match_table = bbc_beep_match,
262 },
263 .probe = bbc_beep_probe,
264 .remove = bbc_remove,
265 .shutdown = sparcspkr_shutdown,
266};
267
268static int grover_beep_probe(struct platform_device *op)
269{
270 struct sparcspkr_state *state;
271 struct grover_beep_info *info;
272 int err = -ENOMEM;
273
274 state = kzalloc(sizeof(*state), GFP_KERNEL);
275 if (!state)
276 goto out_err;
277
278 state->name = "Sparc Grover Speaker";
279 state->event = grover_spkr_event;
280 spin_lock_init(&state->lock);
281
282 info = &state->u.grover;
283 info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq");
284 if (!info->freq_regs)
285 goto out_free;
286
287 info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable");
288 if (!info->enable_reg)
289 goto out_unmap_freq_regs;
290
291 platform_set_drvdata(op, state);
292
293 err = sparcspkr_probe(&op->dev);
294 if (err)
295 goto out_clear_drvdata;
296
297 return 0;
298
299out_clear_drvdata:
300 of_iounmap(&op->resource[3], info->enable_reg, 1);
301
302out_unmap_freq_regs:
303 of_iounmap(&op->resource[2], info->freq_regs, 2);
304out_free:
305 kfree(state);
306out_err:
307 return err;
308}
309
310static int grover_remove(struct platform_device *op)
311{
312 struct sparcspkr_state *state = platform_get_drvdata(op);
313 struct grover_beep_info *info = &state->u.grover;
314 struct input_dev *input_dev = state->input_dev;
315
316 /* turn off the speaker */
317 state->event(input_dev, EV_SND, SND_BELL, 0);
318
319 input_unregister_device(input_dev);
320
321 of_iounmap(&op->resource[3], info->enable_reg, 1);
322 of_iounmap(&op->resource[2], info->freq_regs, 2);
323
324 kfree(state);
325
326 return 0;
327}
328
329static const struct of_device_id grover_beep_match[] = {
330 {
331 .name = "beep",
332 .compatible = "SUNW,smbus-beep",
333 },
334 {},
335};
336MODULE_DEVICE_TABLE(of, grover_beep_match);
337
338static struct platform_driver grover_beep_driver = {
339 .driver = {
340 .name = "groverbeep",
341 .of_match_table = grover_beep_match,
342 },
343 .probe = grover_beep_probe,
344 .remove = grover_remove,
345 .shutdown = sparcspkr_shutdown,
346};
347
348static struct platform_driver * const drivers[] = {
349 &bbc_beep_driver,
350 &grover_beep_driver,
351};
352
353static int __init sparcspkr_init(void)
354{
355 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
356}
357
358static void __exit sparcspkr_exit(void)
359{
360 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
361}
362
363module_init(sparcspkr_init);
364module_exit(sparcspkr_exit);
365

Warning: That file was not part of the compilation database. It may have many parsing errors.