xref: /linux/drivers/input/misc/sparcspkr.c (revision 3e51108c72e8adbcf3180ed40527a2a9d2d0123b)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Driver for PC-speaker like devices found on various Sparc systems.
4  *
5  *  Copyright (c) 2002 Vojtech Pavlik
6  *  Copyright (c) 2002, 2006, 2008 David S. Miller (davem@davemloft.net)
7  */
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/input.h>
12 #include <linux/of.h>
13 #include <linux/platform_device.h>
14 #include <linux/slab.h>
15 
16 #include <asm/io.h>
17 
18 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
19 MODULE_DESCRIPTION("Sparc Speaker beeper driver");
20 MODULE_LICENSE("GPL");
21 
22 struct grover_beep_info {
23 	void __iomem	*freq_regs;
24 	void __iomem	*enable_reg;
25 };
26 
27 struct bbc_beep_info {
28 	u32		clock_freq;
29 	void __iomem	*regs;
30 };
31 
32 struct sparcspkr_state {
33 	const char		*name;
34 	int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
35 	spinlock_t		lock;
36 	struct input_dev	*input_dev;
37 	union {
38 		struct grover_beep_info grover;
39 		struct bbc_beep_info bbc;
40 	} u;
41 };
42 
bbc_count_to_reg(struct bbc_beep_info * info,unsigned int count)43 static u32 bbc_count_to_reg(struct bbc_beep_info *info, unsigned int count)
44 {
45 	u32 val, clock_freq = info->clock_freq;
46 	int i;
47 
48 	if (!count)
49 		return 0;
50 
51 	if (count <= clock_freq >> 20)
52 		return 1 << 18;
53 
54 	if (count >= clock_freq >> 12)
55 		return 1 << 10;
56 
57 	val = 1 << 18;
58 	for (i = 19; i >= 11; i--) {
59 		val >>= 1;
60 		if (count <= clock_freq >> i)
61 			break;
62 	}
63 
64 	return val;
65 }
66 
bbc_spkr_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)67 static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
68 {
69 	struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
70 	struct bbc_beep_info *info = &state->u.bbc;
71 	unsigned int count = 0;
72 
73 	if (type != EV_SND)
74 		return -1;
75 
76 	switch (code) {
77 		case SND_BELL: if (value) value = 1000;
78 		case SND_TONE: break;
79 		default: return -1;
80 	}
81 
82 	if (value > 20 && value < 32767)
83 		count = 1193182 / value;
84 
85 	count = bbc_count_to_reg(info, count);
86 
87 	guard(spinlock_irqsave)(&state->lock);
88 
89 	if (count) {
90 		sbus_writeb(0x01,                 info->regs + 0);
91 		sbus_writeb(0x00,                 info->regs + 2);
92 		sbus_writeb((count >> 16) & 0xff, info->regs + 3);
93 		sbus_writeb((count >>  8) & 0xff, info->regs + 4);
94 		sbus_writeb(0x00,                 info->regs + 5);
95 	} else {
96 		sbus_writeb(0x00,                 info->regs + 0);
97 	}
98 
99 	return 0;
100 }
101 
grover_spkr_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)102 static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
103 {
104 	struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
105 	struct grover_beep_info *info = &state->u.grover;
106 	unsigned int count = 0;
107 
108 	if (type != EV_SND)
109 		return -1;
110 
111 	switch (code) {
112 		case SND_BELL: if (value) value = 1000;
113 		case SND_TONE: break;
114 		default: return -1;
115 	}
116 
117 	if (value > 20 && value < 32767)
118 		count = 1193182 / value;
119 
120 	guard(spinlock_irqsave)(&state->lock);
121 
122 	if (count) {
123 		/* enable counter 2 */
124 		sbus_writeb(sbus_readb(info->enable_reg) | 3, info->enable_reg);
125 		/* set command for counter 2, 2 byte write */
126 		sbus_writeb(0xB6, info->freq_regs + 1);
127 		/* select desired HZ */
128 		sbus_writeb(count & 0xff, info->freq_regs + 0);
129 		sbus_writeb((count >> 8) & 0xff, info->freq_regs + 0);
130 	} else {
131 		/* disable counter 2 */
132 		sbus_writeb(sbus_readb(info->enable_reg) & 0xFC, info->enable_reg);
133 	}
134 
135 	return 0;
136 }
137 
sparcspkr_probe(struct device * dev)138 static int sparcspkr_probe(struct device *dev)
139 {
140 	struct sparcspkr_state *state = dev_get_drvdata(dev);
141 	struct input_dev *input_dev;
142 	int error;
143 
144 	input_dev = input_allocate_device();
145 	if (!input_dev)
146 		return -ENOMEM;
147 
148 	input_dev->name = state->name;
149 	input_dev->phys = "sparc/input0";
150 	input_dev->id.bustype = BUS_ISA;
151 	input_dev->id.vendor = 0x001f;
152 	input_dev->id.product = 0x0001;
153 	input_dev->id.version = 0x0100;
154 	input_dev->dev.parent = dev;
155 
156 	input_dev->evbit[0] = BIT_MASK(EV_SND);
157 	input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
158 
159 	input_dev->event = state->event;
160 
161 	error = input_register_device(input_dev);
162 	if (error) {
163 		input_free_device(input_dev);
164 		return error;
165 	}
166 
167 	state->input_dev = input_dev;
168 
169 	return 0;
170 }
171 
sparcspkr_shutdown(struct platform_device * dev)172 static void sparcspkr_shutdown(struct platform_device *dev)
173 {
174 	struct sparcspkr_state *state = platform_get_drvdata(dev);
175 	struct input_dev *input_dev = state->input_dev;
176 
177 	/* turn off the speaker */
178 	state->event(input_dev, EV_SND, SND_BELL, 0);
179 }
180 
bbc_beep_probe(struct platform_device * op)181 static int bbc_beep_probe(struct platform_device *op)
182 {
183 	struct sparcspkr_state *state;
184 	struct bbc_beep_info *info;
185 	int err;
186 
187 	state = devm_kzalloc(&op->dev, sizeof(*state), GFP_KERNEL);
188 	if (!state)
189 		return -ENOMEM;
190 
191 	state->name = "Sparc BBC Speaker";
192 	state->event = bbc_spkr_event;
193 	spin_lock_init(&state->lock);
194 
195 	struct device_node *dp __free(device_node) = of_find_node_by_path("/");
196 	if (!dp)
197 		return -ENODEV;
198 
199 	info = &state->u.bbc;
200 	info->clock_freq = of_getintprop_default(dp, "clock-frequency", 0);
201 	if (!info->clock_freq)
202 		return -ENODEV;
203 
204 	info->regs = of_ioremap(&op->resource[0], 0, 6, "bbc beep");
205 	if (!info->regs)
206 		return -ENODEV;
207 
208 	platform_set_drvdata(op, state);
209 
210 	err = sparcspkr_probe(&op->dev);
211 	if (err) {
212 		of_iounmap(&op->resource[0], info->regs, 6);
213 		return err;
214 	}
215 
216 	return 0;
217 }
218 
bbc_remove(struct platform_device * op)219 static void bbc_remove(struct platform_device *op)
220 {
221 	struct sparcspkr_state *state = platform_get_drvdata(op);
222 	struct input_dev *input_dev = state->input_dev;
223 	struct bbc_beep_info *info = &state->u.bbc;
224 
225 	/* turn off the speaker */
226 	state->event(input_dev, EV_SND, SND_BELL, 0);
227 
228 	input_unregister_device(input_dev);
229 
230 	of_iounmap(&op->resource[0], info->regs, 6);
231 }
232 
233 static const struct of_device_id bbc_beep_match[] = {
234 	{
235 		.name = "beep",
236 		.compatible = "SUNW,bbc-beep",
237 	},
238 	{},
239 };
240 MODULE_DEVICE_TABLE(of, bbc_beep_match);
241 
242 static struct platform_driver bbc_beep_driver = {
243 	.driver = {
244 		.name = "bbcbeep",
245 		.of_match_table = bbc_beep_match,
246 	},
247 	.probe		= bbc_beep_probe,
248 	.remove		= bbc_remove,
249 	.shutdown	= sparcspkr_shutdown,
250 };
251 
grover_beep_probe(struct platform_device * op)252 static int grover_beep_probe(struct platform_device *op)
253 {
254 	struct sparcspkr_state *state;
255 	struct grover_beep_info *info;
256 	int err = -ENOMEM;
257 
258 	state = devm_kzalloc(&op->dev, sizeof(*state), GFP_KERNEL);
259 	if (!state)
260 		return err;
261 
262 	state->name = "Sparc Grover Speaker";
263 	state->event = grover_spkr_event;
264 	spin_lock_init(&state->lock);
265 
266 	info = &state->u.grover;
267 	info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq");
268 	if (!info->freq_regs)
269 		return err;
270 
271 	info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable");
272 	if (!info->enable_reg)
273 		goto out_unmap_freq_regs;
274 
275 	platform_set_drvdata(op, state);
276 
277 	err = sparcspkr_probe(&op->dev);
278 	if (err)
279 		goto out_clear_drvdata;
280 
281 	return 0;
282 
283 out_clear_drvdata:
284 	of_iounmap(&op->resource[3], info->enable_reg, 1);
285 
286 out_unmap_freq_regs:
287 	of_iounmap(&op->resource[2], info->freq_regs, 2);
288 
289 	return err;
290 }
291 
grover_remove(struct platform_device * op)292 static void grover_remove(struct platform_device *op)
293 {
294 	struct sparcspkr_state *state = platform_get_drvdata(op);
295 	struct grover_beep_info *info = &state->u.grover;
296 	struct input_dev *input_dev = state->input_dev;
297 
298 	/* turn off the speaker */
299 	state->event(input_dev, EV_SND, SND_BELL, 0);
300 
301 	input_unregister_device(input_dev);
302 
303 	of_iounmap(&op->resource[3], info->enable_reg, 1);
304 	of_iounmap(&op->resource[2], info->freq_regs, 2);
305 }
306 
307 static const struct of_device_id grover_beep_match[] = {
308 	{
309 		.name = "beep",
310 		.compatible = "SUNW,smbus-beep",
311 	},
312 	{},
313 };
314 MODULE_DEVICE_TABLE(of, grover_beep_match);
315 
316 static struct platform_driver grover_beep_driver = {
317 	.driver = {
318 		.name = "groverbeep",
319 		.of_match_table = grover_beep_match,
320 	},
321 	.probe		= grover_beep_probe,
322 	.remove		= grover_remove,
323 	.shutdown	= sparcspkr_shutdown,
324 };
325 
326 static struct platform_driver * const drivers[] = {
327 	&bbc_beep_driver,
328 	&grover_beep_driver,
329 };
330 
sparcspkr_init(void)331 static int __init sparcspkr_init(void)
332 {
333 	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
334 }
335 
sparcspkr_exit(void)336 static void __exit sparcspkr_exit(void)
337 {
338 	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
339 }
340 
341 module_init(sparcspkr_init);
342 module_exit(sparcspkr_exit);
343