// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for PC-speaker like devices found on various Sparc systems.
*
* Copyright (c) 2002 Vojtech Pavlik
* Copyright (c) 2002, 2006, 2008 David S. Miller ([email protected])
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <asm/io.h>
MODULE_AUTHOR("David S. Miller <[email protected]>");
MODULE_DESCRIPTION("Sparc Speaker beeper driver");
MODULE_LICENSE("GPL");
struct grover_beep_info {
void __iomem *freq_regs;
void __iomem *enable_reg;
};
struct bbc_beep_info {
u32 clock_freq;
void __iomem *regs;
};
struct sparcspkr_state {
const char *name;
int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
spinlock_t lock;
struct input_dev *input_dev;
union {
struct grover_beep_info grover;
struct bbc_beep_info bbc;
} u;
};
static u32 bbc_count_to_reg(struct bbc_beep_info *info, unsigned int count)
{
u32 val, clock_freq = info->clock_freq;
int i;
if (!count)
return 0;
if (count <= clock_freq >> 20)
return 1 << 18;
if (count >= clock_freq >> 12)
return 1 << 10;
val = 1 << 18;
for (i = 19; i >= 11; i--) {
val >>= 1;
if (count <= clock_freq >> i)
break;
}
return val;
}
static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
struct bbc_beep_info *info = &state->u.bbc;
unsigned int count = 0;
unsigned long flags;
if (type != EV_SND)
return -1;
switch (code) {
case SND_BELL: if (value) value = 1000;
case SND_TONE: break;
default: return -1;
}
if (value > 20 && value < 32767)
count = 1193182 / value;
count = bbc_count_to_reg(info, count);
spin_lock_irqsave(&state->lock, flags);
if (count) {
sbus_writeb(0x01, info->regs + 0);
sbus_writeb(0x00, info->regs + 2);
sbus_writeb((count >> 16) & 0xff, info->regs + 3);
sbus_writeb((count >> 8) & 0xff, info->regs + 4);
sbus_writeb(0x00, info->regs + 5);
} else {
sbus_writeb(0x00, info->regs + 0);
}
spin_unlock_irqrestore(&state->lock, flags);
return 0;
}
static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
struct grover_beep_info *info = &state->u.grover;
unsigned int count = 0;
unsigned long flags;
if (type != EV_SND)
return -1;
switch (code) {
case SND_BELL: if (value) value = 1000;
case SND_TONE: break;
default: return -1;
}
if (value > 20 && value < 32767)
count = 1193182 / value;
spin_lock_irqsave(&state->lock, flags);
if (count) {
/* enable counter 2 */
sbus_writeb(sbus_readb(info->enable_reg) | 3, info->enable_reg);
/* set command for counter 2, 2 byte write */
sbus_writeb(0xB6, info->freq_regs + 1);
/* select desired HZ */
sbus_writeb(count & 0xff, info->freq_regs + 0);
sbus_writeb((count >> 8) & 0xff, info->freq_regs + 0);
} else {
/* disable counter 2 */
sbus_writeb(sbus_readb(info->enable_reg) & 0xFC, info->enable_reg);
}
spin_unlock_irqrestore(&state->lock, flags);
return 0;
}
static int sparcspkr_probe(struct device *dev)
{
struct sparcspkr_state *state = dev_get_drvdata(dev);
struct input_dev *input_dev;
int error;
input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
input_dev->name = state->name;
input_dev->phys = "sparc/input0";
input_dev->id.bustype = BUS_ISA;
input_dev->id.vendor = 0x001f;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->dev.parent = dev;
input_dev->evbit[0] = BIT_MASK(EV_SND);
input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
input_dev->event = state->event;
error = input_register_device(input_dev);
if (error) {
input_free_device(input_dev);
return error;
}
state->input_dev = input_dev;
return 0;
}
static void sparcspkr_shutdown(struct platform_device *dev)
{
struct sparcspkr_state *state = platform_get_drvdata(dev);
struct input_dev *input_dev = state->input_dev;
/* turn off the speaker */
state->event(input_dev, EV_SND, SND_BELL, 0);
}
static int bbc_beep_probe(struct platform_device *op)
{
struct sparcspkr_state *state;
struct bbc_beep_info *info;
struct device_node *dp;
int err = -ENOMEM;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
goto out_err;
state->name = "Sparc BBC Speaker";
state->event = bbc_spkr_event;
spin_lock_init(&state->lock);
dp = of_find_node_by_path("/");
err = -ENODEV;
if (!dp)
goto out_free;
info = &state->u.bbc;
info->clock_freq = of_getintprop_default(dp, "clock-frequency", 0);
of_node_put(dp);
if (!info->clock_freq)
goto out_free;
info->regs = of_ioremap(&op->resource[0], 0, 6, "bbc beep");
if (!info->regs)
goto out_free;
platform_set_drvdata(op, state);
err = sparcspkr_probe(&op->dev);
if (err)
goto out_clear_drvdata;
return 0;
out_clear_drvdata:
of_iounmap(&op->resource[0], info->regs, 6);
out_free:
kfree(state);
out_err:
return err;
}
static void bbc_remove(struct platform_device *op)
{
struct sparcspkr_state *state = platform_get_drvdata(op);
struct input_dev *input_dev = state->input_dev;
struct bbc_beep_info *info = &state->u.bbc;
/* turn off the speaker */
state->event(input_dev, EV_SND, SND_BELL, 0);
input_unregister_device(input_dev);
of_iounmap(&op->resource[0], info->regs, 6);
kfree(state);
}
static const struct of_device_id bbc_beep_match[] = {
{
.name = "beep",
.compatible = "SUNW,bbc-beep",
},
{},
};
MODULE_DEVICE_TABLE(of, bbc_beep_match);
static struct platform_driver bbc_beep_driver = {
.driver = {
.name = "bbcbeep",
.of_match_table = bbc_beep_match,
},
.probe = bbc_beep_probe,
.remove_new = bbc_remove,
.shutdown = sparcspkr_shutdown,
};
static int grover_beep_probe(struct platform_device *op)
{
struct sparcspkr_state *state;
struct grover_beep_info *info;
int err = -ENOMEM;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
goto out_err;
state->name = "Sparc Grover Speaker";
state->event = grover_spkr_event;
spin_lock_init(&state->lock);
info = &state->u.grover;
info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq");
if (!info->freq_regs)
goto out_free;
info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable");
if (!info->enable_reg)
goto out_unmap_freq_regs;
platform_set_drvdata(op, state);
err = sparcspkr_probe(&op->dev);
if (err)
goto out_clear_drvdata;
return 0;
out_clear_drvdata:
of_iounmap(&op->resource[3], info->enable_reg, 1);
out_unmap_freq_regs:
of_iounmap(&op->resource[2], info->freq_regs, 2);
out_free:
kfree(state);
out_err:
return err;
}
static void grover_remove(struct platform_device *op)
{
struct sparcspkr_state *state = platform_get_drvdata(op);
struct grover_beep_info *info = &state->u.grover;
struct input_dev *input_dev = state->input_dev;
/* turn off the speaker */
state->event(input_dev, EV_SND, SND_BELL, 0);
input_unregister_device(input_dev);
of_iounmap(&op->resource[3], info->enable_reg, 1);
of_iounmap(&op->resource[2], info->freq_regs, 2);
kfree(state);
}
static const struct of_device_id grover_beep_match[] = {
{
.name = "beep",
.compatible = "SUNW,smbus-beep",
},
{},
};
MODULE_DEVICE_TABLE(of, grover_beep_match);
static struct platform_driver grover_beep_driver = {
.driver = {
.name = "groverbeep",
.of_match_table = grover_beep_match,
},
.probe = grover_beep_probe,
.remove_new = grover_remove,
.shutdown = sparcspkr_shutdown,
};
static struct platform_driver * const drivers[] = {
&bbc_beep_driver,
&grover_beep_driver,
};
static int __init sparcspkr_init(void)
{
return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
}
static void __exit sparcspkr_exit(void)
{
platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
}
module_init(sparcspkr_init);
module_exit(sparcspkr_exit);
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