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};
256
257static struct platform_driver bbc_beep_driver = {
258	.driver = {
259		.name = "bbcbeep",
260		.of_match_table = bbc_beep_match,
261	},
262	.probe		= bbc_beep_probe,
263	.remove		= bbc_remove,
264	.shutdown	= sparcspkr_shutdown,
265};
266
267static int grover_beep_probe(struct platform_device *op)
268{
269	struct sparcspkr_state *state;
270	struct grover_beep_info *info;
271	int err = -ENOMEM;
272
273	state = kzalloc(sizeof(*state), GFP_KERNEL);
274	if (!state)
275		goto out_err;
276
277	state->name = "Sparc Grover Speaker";
278	state->event = grover_spkr_event;
279	spin_lock_init(&state->lock);
280
281	info = &state->u.grover;
282	info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq");
283	if (!info->freq_regs)
284		goto out_free;
285
286	info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable");
287	if (!info->enable_reg)
288		goto out_unmap_freq_regs;
289
290	platform_set_drvdata(op, state);
291
292	err = sparcspkr_probe(&op->dev);
293	if (err)
294		goto out_clear_drvdata;
295
296	return 0;
297
298out_clear_drvdata:
299	of_iounmap(&op->resource[3], info->enable_reg, 1);
300
301out_unmap_freq_regs:
302	of_iounmap(&op->resource[2], info->freq_regs, 2);
303out_free:
304	kfree(state);
305out_err:
306	return err;
307}
308
309static int grover_remove(struct platform_device *op)
310{
311	struct sparcspkr_state *state = platform_get_drvdata(op);
312	struct grover_beep_info *info = &state->u.grover;
313	struct input_dev *input_dev = state->input_dev;
314
315	/* turn off the speaker */
316	state->event(input_dev, EV_SND, SND_BELL, 0);
317
318	input_unregister_device(input_dev);
319
320	of_iounmap(&op->resource[3], info->enable_reg, 1);
321	of_iounmap(&op->resource[2], info->freq_regs, 2);
322
323	kfree(state);
324
325	return 0;
326}
327
328static const struct of_device_id grover_beep_match[] = {
329	{
330		.name = "beep",
331		.compatible = "SUNW,smbus-beep",
332	},
333	{},
334};
335
336static struct platform_driver grover_beep_driver = {
337	.driver = {
338		.name = "groverbeep",
339		.of_match_table = grover_beep_match,
340	},
341	.probe		= grover_beep_probe,
342	.remove		= grover_remove,
343	.shutdown	= sparcspkr_shutdown,
344};
345
346static int __init sparcspkr_init(void)
347{
348	int err = platform_driver_register(&bbc_beep_driver);
349
350	if (!err) {
351		err = platform_driver_register(&grover_beep_driver);
352		if (err)
353			platform_driver_unregister(&bbc_beep_driver);
354	}
355
356	return err;
357}
358
359static void __exit sparcspkr_exit(void)
360{
361	platform_driver_unregister(&bbc_beep_driver);
362	platform_driver_unregister(&grover_beep_driver);
363}
364
365module_init(sparcspkr_init);
366module_exit(sparcspkr_exit);
367