[mirror_ubuntu-bionic-kernel.git] / drivers / input / misc / bfin_rotary.c

/*
 * Rotary counter driver for Analog Devices Blackfin Processors
 *
 * Copyright 2008-2009 Analog Devices Inc.
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/platform_data/bfin_rotary.h>

#include <asm/portmux.h>

#define CNT_CONFIG_OFF		0	/* CNT Config Offset */
#define CNT_IMASK_OFF		4	/* CNT Interrupt Mask Offset */
#define CNT_STATUS_OFF		8	/* CNT Status Offset */
#define CNT_COMMAND_OFF		12	/* CNT Command Offset */
#define CNT_DEBOUNCE_OFF	16	/* CNT Debounce Offset */
#define CNT_COUNTER_OFF		20	/* CNT Counter Offset */
#define CNT_MAX_OFF		24	/* CNT Maximum Count Offset */
#define CNT_MIN_OFF		28	/* CNT Minimum Count Offset */

struct bfin_rot {
	struct input_dev *input;
	void __iomem *base;
	int irq;
	unsigned int up_key;
	unsigned int down_key;
	unsigned int button_key;
	unsigned int rel_code;

	unsigned short mode;
	unsigned short debounce;

	unsigned short cnt_config;
	unsigned short cnt_imask;
	unsigned short cnt_debounce;
};

static void report_key_event(struct input_dev *input, int keycode)
{
	/* simulate a press-n-release */
	input_report_key(input, keycode, 1);
	input_sync(input);
	input_report_key(input, keycode, 0);
	input_sync(input);
}

static void report_rotary_event(struct bfin_rot *rotary, int delta)
{
	struct input_dev *input = rotary->input;

	if (rotary->up_key) {
		report_key_event(input,
				 delta > 0 ? rotary->up_key : rotary->down_key);
	} else {
		input_report_rel(input, rotary->rel_code, delta);
		input_sync(input);
	}
}

static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
{
	struct bfin_rot *rotary = dev_id;
	int delta;

	switch (readw(rotary->base + CNT_STATUS_OFF)) {

	case ICII:
		break;

	case UCII:
	case DCII:
		delta = readl(rotary->base + CNT_COUNTER_OFF);
		if (delta)
			report_rotary_event(rotary, delta);
		break;

	case CZMII:
		report_key_event(rotary->input, rotary->button_key);
		break;

	default:
		break;
	}

	writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
	writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */

	return IRQ_HANDLED;
}

static int bfin_rotary_open(struct input_dev *input)
{
	struct bfin_rot *rotary = input_get_drvdata(input);
	unsigned short val;

	if (rotary->mode & ROT_DEBE)
		writew(rotary->debounce & DPRESCALE,
			rotary->base + CNT_DEBOUNCE_OFF);

	writew(rotary->mode & ~CNTE, rotary->base + CNT_CONFIG_OFF);

	val = UCIE | DCIE;
	if (rotary->button_key)
		val |= CZMIE;
	writew(val, rotary->base + CNT_IMASK_OFF);

	writew(rotary->mode | CNTE, rotary->base + CNT_CONFIG_OFF);

	return 0;
}

static void bfin_rotary_close(struct input_dev *input)
{
	struct bfin_rot *rotary = input_get_drvdata(input);

	writew(0, rotary->base + CNT_CONFIG_OFF);
	writew(0, rotary->base + CNT_IMASK_OFF);
}

static void bfin_rotary_free_action(void *data)
{
	peripheral_free_list(data);
}

static int bfin_rotary_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct bfin_rotary_platform_data *pdata = dev_get_platdata(dev);
	struct bfin_rot *rotary;
	struct resource *res;
	struct input_dev *input;
	int error;

	/* Basic validation */
	if ((pdata->rotary_up_key && !pdata->rotary_down_key) ||
	    (!pdata->rotary_up_key && pdata->rotary_down_key)) {
		return -EINVAL;
	}

	if (pdata->pin_list) {
		error = peripheral_request_list(pdata->pin_list,
						dev_name(dev));
		if (error) {
			dev_err(dev, "requesting peripherals failed: %d\n",
				error);
			return error;
		}

		error = devm_add_action_or_reset(dev, bfin_rotary_free_action,
						 pdata->pin_list);
		if (error) {
			dev_err(dev, "setting cleanup action failed: %d\n",
				error);
			return error;
		}
	}

	rotary = devm_kzalloc(dev, sizeof(struct bfin_rot), GFP_KERNEL);
	if (!rotary)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	rotary->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(rotary->base))
		return PTR_ERR(rotary->base);

	input = devm_input_allocate_device(dev);
	if (!input)
		return -ENOMEM;

	rotary->input = input;

	rotary->up_key = pdata->rotary_up_key;
	rotary->down_key = pdata->rotary_down_key;
	rotary->button_key = pdata->rotary_button_key;
	rotary->rel_code = pdata->rotary_rel_code;

	rotary->mode = pdata->mode;
	rotary->debounce = pdata->debounce;

	input->name = pdev->name;
	input->phys = "bfin-rotary/input0";
	input->dev.parent = dev;

	input_set_drvdata(input, rotary);

	input->id.bustype = BUS_HOST;
	input->id.vendor = 0x0001;
	input->id.product = 0x0001;
	input->id.version = 0x0100;

	input->open = bfin_rotary_open;
	input->close = bfin_rotary_close;

	if (rotary->up_key) {
		__set_bit(EV_KEY, input->evbit);
		__set_bit(rotary->up_key, input->keybit);
		__set_bit(rotary->down_key, input->keybit);
	} else {
		__set_bit(EV_REL, input->evbit);
		__set_bit(rotary->rel_code, input->relbit);
	}

	if (rotary->button_key) {
		__set_bit(EV_KEY, input->evbit);
		__set_bit(rotary->button_key, input->keybit);
	}

	/* Quiesce the device before requesting irq */
	bfin_rotary_close(input);

	rotary->irq = platform_get_irq(pdev, 0);
	if (rotary->irq < 0) {
		dev_err(dev, "No rotary IRQ specified\n");
		return -ENOENT;
	}

	error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr,
				 0, dev_name(dev), rotary);
	if (error) {
		dev_err(dev, "unable to claim irq %d; error %d\n",
			rotary->irq, error);
		return error;
	}

	error = input_register_device(input);
	if (error) {
		dev_err(dev, "unable to register input device (%d)\n", error);
		return error;
	}

	platform_set_drvdata(pdev, rotary);
	device_init_wakeup(dev, 1);

	return 0;
}

static int __maybe_unused bfin_rotary_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

	rotary->cnt_config = readw(rotary->base + CNT_CONFIG_OFF);
	rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
	rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);

	if (device_may_wakeup(&pdev->dev))
		enable_irq_wake(rotary->irq);

	return 0;
}

static int __maybe_unused bfin_rotary_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

	writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
	writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
	writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);

	if (device_may_wakeup(&pdev->dev))
		disable_irq_wake(rotary->irq);

	if (rotary->cnt_config & CNTE)
		writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);

	return 0;
}

static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
			 bfin_rotary_suspend, bfin_rotary_resume);

static struct platform_driver bfin_rotary_device_driver = {
	.probe		= bfin_rotary_probe,
	.driver		= {
		.name	= "bfin-rotary",
		.pm	= &bfin_rotary_pm_ops,
	},
};
module_platform_driver(bfin_rotary_device_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
MODULE_ALIAS("platform:bfin-rotary");
Commit	Line	Data
48329582 MH	1	/*
	2	* Rotary counter driver for Analog Devices Blackfin Processors
	3	*
	4	* Copyright 2008-2009 Analog Devices Inc.
	5	* Licensed under the GPL-2 or later.
	6	*/
	7
	8	#include <linux/module.h>
48329582	9	#include <linux/interrupt.h>
71adf22f	10	#include <linux/io.h>
48329582 MH	11	#include <linux/irq.h>
	12	#include <linux/pm.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/input.h>
5a0e3ad6	15	#include <linux/slab.h>
1ea74014	16	#include <linux/platform_data/bfin_rotary.h>
48329582 MH	17
48329582 MH	18	#include <asm/portmux.h>
48329582	19
71adf22f SZ	20	#define CNT_CONFIG_OFF 0 /* CNT Config Offset */
	21	#define CNT_IMASK_OFF 4 /* CNT Interrupt Mask Offset */
	22	#define CNT_STATUS_OFF 8 /* CNT Status Offset */
	23	#define CNT_COMMAND_OFF 12 /* CNT Command Offset */
	24	#define CNT_DEBOUNCE_OFF 16 /* CNT Debounce Offset */
	25	#define CNT_COUNTER_OFF 20 /* CNT Counter Offset */
	26	#define CNT_MAX_OFF 24 /* CNT Maximum Count Offset */
	27	#define CNT_MIN_OFF 28 /* CNT Minimum Count Offset */
	28
48329582 MH	29	struct bfin_rot {
48329582 MH	30	struct input_dev *input;
71adf22f	31	void __iomem *base;
48329582 MH	32	int irq;
	33	unsigned int up_key;
	34	unsigned int down_key;
	35	unsigned int button_key;
	36	unsigned int rel_code;
c8af781e DT	37
	38	unsigned short mode;
	39	unsigned short debounce;
	40
48329582 MH	41	unsigned short cnt_config;
	42	unsigned short cnt_imask;
	43	unsigned short cnt_debounce;
	44	};
	45
	46	static void report_key_event(struct input_dev *input, int keycode)
	47	{
	48	/* simulate a press-n-release */
	49	input_report_key(input, keycode, 1);
	50	input_sync(input);
	51	input_report_key(input, keycode, 0);
	52	input_sync(input);
	53	}
	54
	55	static void report_rotary_event(struct bfin_rot *rotary, int delta)
	56	{
	57	struct input_dev *input = rotary->input;
	58
	59	if (rotary->up_key) {
	60	report_key_event(input,
	61	delta > 0 ? rotary->up_key : rotary->down_key);
	62	} else {
	63	input_report_rel(input, rotary->rel_code, delta);
	64	input_sync(input);
	65	}
	66	}
	67
	68	static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
	69	{
7694f44d	70	struct bfin_rot *rotary = dev_id;
48329582 MH	71	int delta;
48329582 MH	72
71adf22f	73	switch (readw(rotary->base + CNT_STATUS_OFF)) {
48329582 MH	74
	75	case ICII:
	76	break;
	77
	78	case UCII:
	79	case DCII:
71adf22f	80	delta = readl(rotary->base + CNT_COUNTER_OFF);
48329582 MH	81	if (delta)
	82	report_rotary_event(rotary, delta);
	83	break;
	84
	85	case CZMII:
	86	report_key_event(rotary->input, rotary->button_key);
	87	break;
	88
	89	default:
	90	break;
	91	}
	92
71adf22f SZ	93	writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
71adf22f SZ	94	writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */
48329582 MH	95
	96	return IRQ_HANDLED;
	97	}
	98
c8af781e DT	99	static int bfin_rotary_open(struct input_dev *input)
	100	{
	101	struct bfin_rot *rotary = input_get_drvdata(input);
	102	unsigned short val;
	103
	104	if (rotary->mode & ROT_DEBE)
	105	writew(rotary->debounce & DPRESCALE,
	106	rotary->base + CNT_DEBOUNCE_OFF);
	107
	108	writew(rotary->mode & ~CNTE, rotary->base + CNT_CONFIG_OFF);
	109
	110	val = UCIE \| DCIE;
	111	if (rotary->button_key)
	112	val \|= CZMIE;
	113	writew(val, rotary->base + CNT_IMASK_OFF);
	114
	115	writew(rotary->mode \| CNTE, rotary->base + CNT_CONFIG_OFF);
	116
	117	return 0;
	118	}
	119
	120	static void bfin_rotary_close(struct input_dev *input)
	121	{
	122	struct bfin_rot *rotary = input_get_drvdata(input);
	123
	124	writew(0, rotary->base + CNT_CONFIG_OFF);
	125	writew(0, rotary->base + CNT_IMASK_OFF);
	126	}
	127
f14d4df9 SZ	128	static void bfin_rotary_free_action(void *data)
	129	{
	130	peripheral_free_list(data);
	131	}
	132
5298cc4c	133	static int bfin_rotary_probe(struct platform_device *pdev)
48329582	134	{
71adf22f	135	struct device *dev = &pdev->dev;
f14d4df9	136	const struct bfin_rotary_platform_data *pdata = dev_get_platdata(dev);
48329582	137	struct bfin_rot *rotary;
71adf22f	138	struct resource *res;
48329582 MH	139	struct input_dev *input;
	140	int error;
	141
	142	/* Basic validation */
	143	if ((pdata->rotary_up_key && !pdata->rotary_down_key) \|\|
	144	(!pdata->rotary_up_key && pdata->rotary_down_key)) {
	145	return -EINVAL;
	146	}
	147
5ea0699a SZ	148	if (pdata->pin_list) {
5ea0699a SZ	149	error = peripheral_request_list(pdata->pin_list,
0265c324	150	dev_name(dev));
5ea0699a	151	if (error) {
f14d4df9 SZ	152	dev_err(dev, "requesting peripherals failed: %d\n",
f14d4df9 SZ	153	error);
5ea0699a SZ	154	return error;
5ea0699a SZ	155	}
48329582	156
0265c324 GR	157	error = devm_add_action_or_reset(dev, bfin_rotary_free_action,
0265c324 GR	158	pdata->pin_list);
f14d4df9 SZ	159	if (error) {
	160	dev_err(dev, "setting cleanup action failed: %d\n",
	161	error);
f14d4df9 SZ	162	return error;
f14d4df9 SZ	163	}
48329582 MH	164	}
48329582 MH	165
f14d4df9 SZ	166	rotary = devm_kzalloc(dev, sizeof(struct bfin_rot), GFP_KERNEL);
	167	if (!rotary)
	168	return -ENOMEM;
	169
71adf22f SZ	170	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
71adf22f SZ	171	rotary->base = devm_ioremap_resource(dev, res);
f14d4df9 SZ	172	if (IS_ERR(rotary->base))
	173	return PTR_ERR(rotary->base);
	174
	175	input = devm_input_allocate_device(dev);
	176	if (!input)
	177	return -ENOMEM;
71adf22f	178
48329582 MH	179	rotary->input = input;
	180
	181	rotary->up_key = pdata->rotary_up_key;
	182	rotary->down_key = pdata->rotary_down_key;
	183	rotary->button_key = pdata->rotary_button_key;
	184	rotary->rel_code = pdata->rotary_rel_code;
	185
c8af781e DT	186	rotary->mode = pdata->mode;
	187	rotary->debounce = pdata->debounce;
	188
48329582 MH	189	input->name = pdev->name;
48329582 MH	190	input->phys = "bfin-rotary/input0";
0265c324	191	input->dev.parent = dev;
48329582 MH	192
	193	input_set_drvdata(input, rotary);
	194
	195	input->id.bustype = BUS_HOST;
	196	input->id.vendor = 0x0001;
	197	input->id.product = 0x0001;
	198	input->id.version = 0x0100;
	199
c8af781e DT	200	input->open = bfin_rotary_open;
	201	input->close = bfin_rotary_close;
	202
48329582 MH	203	if (rotary->up_key) {
	204	__set_bit(EV_KEY, input->evbit);
	205	__set_bit(rotary->up_key, input->keybit);
	206	__set_bit(rotary->down_key, input->keybit);
	207	} else {
	208	__set_bit(EV_REL, input->evbit);
	209	__set_bit(rotary->rel_code, input->relbit);
	210	}
	211
	212	if (rotary->button_key) {
	213	__set_bit(EV_KEY, input->evbit);
	214	__set_bit(rotary->button_key, input->keybit);
	215	}
	216
c8af781e DT	217	/* Quiesce the device before requesting irq */
	218	bfin_rotary_close(input);
	219
f14d4df9 SZ	220	rotary->irq = platform_get_irq(pdev, 0);
	221	if (rotary->irq < 0) {
	222	dev_err(dev, "No rotary IRQ specified\n");
	223	return -ENOENT;
	224	}
	225
	226	error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr,
	227	0, dev_name(dev), rotary);
48329582	228	if (error) {
f14d4df9	229	dev_err(dev, "unable to claim irq %d; error %d\n",
48329582	230	rotary->irq, error);
f14d4df9	231	return error;
48329582 MH	232	}
	233
	234	error = input_register_device(input);
	235	if (error) {
f14d4df9 SZ	236	dev_err(dev, "unable to register input device (%d)\n", error);
f14d4df9 SZ	237	return error;
48329582 MH	238	}
48329582 MH	239
48329582	240	platform_set_drvdata(pdev, rotary);
0265c324	241	device_init_wakeup(dev, 1);
48329582 MH	242
48329582 MH	243	return 0;
48329582 MH	244	}
48329582 MH	245
5ec662e7	246	static int __maybe_unused bfin_rotary_suspend(struct device *dev)
48329582 MH	247	{
	248	struct platform_device *pdev = to_platform_device(dev);
	249	struct bfin_rot *rotary = platform_get_drvdata(pdev);
	250
71adf22f SZ	251	rotary->cnt_config = readw(rotary->base + CNT_CONFIG_OFF);
	252	rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
	253	rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);
48329582 MH	254
	255	if (device_may_wakeup(&pdev->dev))
	256	enable_irq_wake(rotary->irq);
	257
	258	return 0;
	259	}
	260
5ec662e7	261	static int __maybe_unused bfin_rotary_resume(struct device *dev)
48329582 MH	262	{
	263	struct platform_device *pdev = to_platform_device(dev);
	264	struct bfin_rot *rotary = platform_get_drvdata(pdev);
	265
71adf22f SZ	266	writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
	267	writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
	268	writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);
48329582 MH	269
	270	if (device_may_wakeup(&pdev->dev))
	271	disable_irq_wake(rotary->irq);
	272
	273	if (rotary->cnt_config & CNTE)
71adf22f	274	writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);
48329582 MH	275
	276	return 0;
	277	}
	278
5ec662e7 DT	279	static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
5ec662e7 DT	280	bfin_rotary_suspend, bfin_rotary_resume);
48329582 MH	281
	282	static struct platform_driver bfin_rotary_device_driver = {
	283	.probe = bfin_rotary_probe,
48329582 MH	284	.driver = {
48329582 MH	285	.name = "bfin-rotary",
48329582	286	.pm = &bfin_rotary_pm_ops,
48329582 MH	287	},
48329582 MH	288	};
840a746b	289	module_platform_driver(bfin_rotary_device_driver);
48329582 MH	290
	291	MODULE_LICENSE("GPL");
	292	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	293	MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
	294	MODULE_ALIAS("platform:bfin-rotary");