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/*
* Freescale STMP3XXX Rotary Encoder Driver
*
* Author: Drew Benedetti <drewb@embeddedalley.com>
*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/input-polldev.h>
#include <mach/regs-timrot.h>
#include <mach/rotdec.h>
#include <mach/platform.h>
static int relative;
static unsigned int poll_interval = 500;
void stmp3xxx_rotdec_flush(struct input_polled_dev *dev)
{
/* in relative mode, reading the counter resets it */
if (relative)
__raw_readl(REGS_TIMROT_BASE + HW_TIMROT_ROTCOUNT);
}
void stmp3xxx_rotdec_poll(struct input_polled_dev *dev)
{
s16 cnt = __raw_readl(REGS_TIMROT_BASE + HW_TIMROT_ROTCOUNT) & BM_TIMROT_ROTCOUNT_UPDOWN;
if (relative)
input_report_rel(dev->input, REL_WHEEL, cnt);
else
input_report_abs(dev->input, ABS_WHEEL, cnt);
}
struct input_polled_dev *rotdec;
static u32 rotctrl;
static int stmp3xxx_rotdec_probe(struct platform_device *pdev)
{
int rc = 0;
/* save original state of HW_TIMROT_ROTCTRL */
rotctrl = __raw_readl(REGS_TIMROT_BASE + HW_TIMROT_ROTCTRL);
if (!(rotctrl & BM_TIMROT_ROTCTRL_ROTARY_PRESENT)) {
dev_info(&pdev->dev, "No rotary decoder present\n");
rc = -ENODEV;
goto err_rotdec_present;
} else {
/* I had to add some extra line breaks in here
* to avoid lines >80 chars wide
*/
__raw_writel(
BF(0x0, TIMROT_ROTCTRL_DIVIDER) | /* 32kHz divider - 1 */
BF(BV_TIMROT_ROTCTRL_OVERSAMPLE__2X,
TIMROT_ROTCTRL_OVERSAMPLE) |
BF(BV_TIMROT_ROTCTRL_SELECT_B__ROTARYB,
TIMROT_ROTCTRL_SELECT_B) |
BF(BV_TIMROT_ROTCTRL_SELECT_A__ROTARYA,
TIMROT_ROTCTRL_SELECT_A)
, REGS_TIMROT_BASE + HW_TIMROT_ROTCTRL);
__raw_writel(
BM_TIMROT_ROTCTRL_POLARITY_B |
BM_TIMROT_ROTCTRL_POLARITY_A
, REGS_TIMROT_BASE + HW_TIMROT_ROTCTRL_CLR);
if (relative)
__raw_writel(BM_TIMROT_ROTCTRL_RELATIVE,
REGS_TIMROT_BASE + HW_TIMROT_ROTCTRL_SET);
else
__raw_writel(BM_TIMROT_ROTCTRL_RELATIVE,
REGS_TIMROT_BASE + HW_TIMROT_ROTCTRL_CLR);
rc = rotdec_pinmux_request();
if (rc) {
dev_err(&pdev->dev,
"Pin request failed (err=%d)\n", rc);
goto err_pinmux;
}
/* set up input_polled_dev */
rotdec = input_allocate_polled_device();
if (!rotdec) {
dev_err(&pdev->dev,
"Unable to allocate polled device\n");
rc = -ENOMEM;
goto err_alloc_polldev;
}
rotdec->flush = stmp3xxx_rotdec_flush;
rotdec->poll = stmp3xxx_rotdec_poll;
rotdec->poll_interval = poll_interval; /* msec */
rotdec->input->name = "stmp3xxx-rotdec";
if (relative)
input_set_capability(rotdec->input, EV_REL, REL_WHEEL);
else {
input_set_capability(rotdec->input, EV_ABS, ABS_WHEEL);
input_set_abs_params(rotdec->input, ABS_WHEEL,
-32768, 32767, 0, 0);
}
rc = input_register_polled_device(rotdec);
if (rc) {
dev_err(&pdev->dev,
"Unable to register rotary decoder (err=%d)\n",
rc);
goto err_reg_polldev;
}
}
return 0;
err_reg_polldev:
input_free_polled_device(rotdec);
err_alloc_polldev:
rotdec_pinmux_free();
err_pinmux:
/* restore original register state */
__raw_writel(rotctrl, REGS_TIMROT_BASE + HW_TIMROT_ROTCTRL);
err_rotdec_present:
return rc;
}
static int stmp3xxx_rotdec_remove(struct platform_device *pdev)
{
input_unregister_polled_device(rotdec);
input_free_polled_device(rotdec);
rotdec_pinmux_free();
/* restore original register state */
__raw_writel(rotctrl, REGS_TIMROT_BASE + HW_TIMROT_ROTCTRL);
return 0;
}
static struct platform_driver stmp3xxx_rotdec_driver = {
.probe = stmp3xxx_rotdec_probe,
.remove = stmp3xxx_rotdec_remove,
.driver = {
.name = "stmp3xxx-rotdec",
},
};
static int __init stmp3xxx_rotdec_init(void)
{
return platform_driver_register(&stmp3xxx_rotdec_driver);
}
static void __exit stmp3xxx_rotdec_exit(void)
{
platform_driver_unregister(&stmp3xxx_rotdec_driver);
}
module_init(stmp3xxx_rotdec_init);
module_exit(stmp3xxx_rotdec_exit);
module_param(relative, bool, 0600);
module_param(poll_interval, uint, 0600);
MODULE_AUTHOR("Drew Benedetti <drewb@embeddedalley.com>");
MODULE_DESCRIPTION("STMP3xxx rotary decoder driver");
MODULE_LICENSE("GPL");
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