[deliverable/linux.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 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 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(&pdev->dev));
		if (error) {
			dev_err(dev, "requesting peripherals failed: %d\n",
				error);
			return error;
		}

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

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

	input_set_drvdata(input, rotary);

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

	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);
	}

	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;
	}

	if (pdata->rotary_button_key)
		writew(CZMIE, rotary->base + CNT_IMASK_OFF);

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

	if (pdata->mode)
		writew(readw(rotary->base + CNT_CONFIG_OFF) |
			(pdata->mode & ~CNTE),
			rotary->base + CNT_CONFIG_OFF);

	writew(readw(rotary->base + CNT_IMASK_OFF) | UCIE | DCIE,
		rotary->base + CNT_IMASK_OFF);
	writew(readw(rotary->base + CNT_CONFIG_OFF) | CNTE,
		rotary->base + CNT_CONFIG_OFF);

	platform_set_drvdata(pdev, rotary);
	device_init_wakeup(&pdev->dev, 1);

	return 0;
}

static int bfin_rotary_remove(struct platform_device *pdev)
{
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

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

	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,
	.remove		= bfin_rotary_remove,
	.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;
	37	unsigned short cnt_config;
	38	unsigned short cnt_imask;
	39	unsigned short cnt_debounce;
	40	};
	41
	42	static void report_key_event(struct input_dev *input, int keycode)
	43	{
	44	/* simulate a press-n-release */
	45	input_report_key(input, keycode, 1);
	46	input_sync(input);
	47	input_report_key(input, keycode, 0);
	48	input_sync(input);
	49	}
	50
	51	static void report_rotary_event(struct bfin_rot *rotary, int delta)
	52	{
	53	struct input_dev *input = rotary->input;
	54
	55	if (rotary->up_key) {
	56	report_key_event(input,
	57	delta > 0 ? rotary->up_key : rotary->down_key);
	58	} else {
	59	input_report_rel(input, rotary->rel_code, delta);
	60	input_sync(input);
	61	}
	62	}
	63
	64	static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
	65	{
7694f44d	66	struct bfin_rot *rotary = dev_id;
48329582 MH	67	int delta;
48329582 MH	68
71adf22f	69	switch (readw(rotary->base + CNT_STATUS_OFF)) {
48329582 MH	70
	71	case ICII:
	72	break;
	73
	74	case UCII:
	75	case DCII:
71adf22f	76	delta = readl(rotary->base + CNT_COUNTER_OFF);
48329582 MH	77	if (delta)
	78	report_rotary_event(rotary, delta);
	79	break;
	80
	81	case CZMII:
	82	report_key_event(rotary->input, rotary->button_key);
	83	break;
	84
	85	default:
	86	break;
	87	}
	88
71adf22f SZ	89	writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
71adf22f SZ	90	writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */
48329582 MH	91
	92	return IRQ_HANDLED;
	93	}
	94
f14d4df9 SZ	95	static void bfin_rotary_free_action(void *data)
	96	{
	97	peripheral_free_list(data);
	98	}
	99
5298cc4c	100	static int bfin_rotary_probe(struct platform_device *pdev)
48329582	101	{
71adf22f	102	struct device *dev = &pdev->dev;
f14d4df9	103	const struct bfin_rotary_platform_data *pdata = dev_get_platdata(dev);
48329582	104	struct bfin_rot *rotary;
71adf22f	105	struct resource *res;
48329582 MH	106	struct input_dev *input;
	107	int error;
	108
	109	/* Basic validation */
	110	if ((pdata->rotary_up_key && !pdata->rotary_down_key) \|\|
	111	(!pdata->rotary_up_key && pdata->rotary_down_key)) {
	112	return -EINVAL;
	113	}
	114
5ea0699a SZ	115	if (pdata->pin_list) {
	116	error = peripheral_request_list(pdata->pin_list,
	117	dev_name(&pdev->dev));
	118	if (error) {
f14d4df9 SZ	119	dev_err(dev, "requesting peripherals failed: %d\n",
f14d4df9 SZ	120	error);
5ea0699a SZ	121	return error;
5ea0699a SZ	122	}
48329582	123
f14d4df9 SZ	124	error = devm_add_action(dev, bfin_rotary_free_action,
	125	pdata->pin_list);
	126	if (error) {
	127	dev_err(dev, "setting cleanup action failed: %d\n",
	128	error);
	129	peripheral_free_list(pdata->pin_list);
	130	return error;
	131	}
48329582 MH	132	}
48329582 MH	133
f14d4df9 SZ	134	rotary = devm_kzalloc(dev, sizeof(struct bfin_rot), GFP_KERNEL);
	135	if (!rotary)
	136	return -ENOMEM;
	137
71adf22f SZ	138	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
71adf22f SZ	139	rotary->base = devm_ioremap_resource(dev, res);
f14d4df9 SZ	140	if (IS_ERR(rotary->base))
	141	return PTR_ERR(rotary->base);
	142
	143	input = devm_input_allocate_device(dev);
	144	if (!input)
	145	return -ENOMEM;
71adf22f	146
48329582 MH	147	rotary->input = input;
	148
	149	rotary->up_key = pdata->rotary_up_key;
	150	rotary->down_key = pdata->rotary_down_key;
	151	rotary->button_key = pdata->rotary_button_key;
	152	rotary->rel_code = pdata->rotary_rel_code;
	153
48329582 MH	154	input->name = pdev->name;
	155	input->phys = "bfin-rotary/input0";
	156	input->dev.parent = &pdev->dev;
	157
	158	input_set_drvdata(input, rotary);
	159
	160	input->id.bustype = BUS_HOST;
	161	input->id.vendor = 0x0001;
	162	input->id.product = 0x0001;
	163	input->id.version = 0x0100;
	164
	165	if (rotary->up_key) {
	166	__set_bit(EV_KEY, input->evbit);
	167	__set_bit(rotary->up_key, input->keybit);
	168	__set_bit(rotary->down_key, input->keybit);
	169	} else {
	170	__set_bit(EV_REL, input->evbit);
	171	__set_bit(rotary->rel_code, input->relbit);
	172	}
	173
	174	if (rotary->button_key) {
	175	__set_bit(EV_KEY, input->evbit);
	176	__set_bit(rotary->button_key, input->keybit);
	177	}
	178
f14d4df9 SZ	179	rotary->irq = platform_get_irq(pdev, 0);
	180	if (rotary->irq < 0) {
	181	dev_err(dev, "No rotary IRQ specified\n");
	182	return -ENOENT;
	183	}
	184
	185	error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr,
	186	0, dev_name(dev), rotary);
48329582	187	if (error) {
f14d4df9	188	dev_err(dev, "unable to claim irq %d; error %d\n",
48329582	189	rotary->irq, error);
f14d4df9	190	return error;
48329582 MH	191	}
	192
	193	error = input_register_device(input);
	194	if (error) {
f14d4df9 SZ	195	dev_err(dev, "unable to register input device (%d)\n", error);
f14d4df9 SZ	196	return error;
48329582 MH	197	}
	198
	199	if (pdata->rotary_button_key)
71adf22f	200	writew(CZMIE, rotary->base + CNT_IMASK_OFF);
48329582 MH	201
48329582 MH	202	if (pdata->mode & ROT_DEBE)
71adf22f SZ	203	writew(pdata->debounce & DPRESCALE,
71adf22f SZ	204	rotary->base + CNT_DEBOUNCE_OFF);
48329582 MH	205
48329582 MH	206	if (pdata->mode)
71adf22f SZ	207	writew(readw(rotary->base + CNT_CONFIG_OFF) \|
	208	(pdata->mode & ~CNTE),
	209	rotary->base + CNT_CONFIG_OFF);
48329582	210
71adf22f SZ	211	writew(readw(rotary->base + CNT_IMASK_OFF) \| UCIE \| DCIE,
	212	rotary->base + CNT_IMASK_OFF);
	213	writew(readw(rotary->base + CNT_CONFIG_OFF) \| CNTE,
	214	rotary->base + CNT_CONFIG_OFF);
48329582 MH	215
	216	platform_set_drvdata(pdev, rotary);
	217	device_init_wakeup(&pdev->dev, 1);
	218
	219	return 0;
48329582 MH	220	}
48329582 MH	221
e2619cf7	222	static int bfin_rotary_remove(struct platform_device *pdev)
48329582 MH	223	{
	224	struct bfin_rot *rotary = platform_get_drvdata(pdev);
	225
71adf22f SZ	226	writew(0, rotary->base + CNT_CONFIG_OFF);
71adf22f SZ	227	writew(0, rotary->base + CNT_IMASK_OFF);
48329582	228
48329582 MH	229	return 0;
	230	}
	231
5ec662e7	232	static int __maybe_unused bfin_rotary_suspend(struct device *dev)
48329582 MH	233	{
	234	struct platform_device *pdev = to_platform_device(dev);
	235	struct bfin_rot *rotary = platform_get_drvdata(pdev);
	236
71adf22f SZ	237	rotary->cnt_config = readw(rotary->base + CNT_CONFIG_OFF);
	238	rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
	239	rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);
48329582 MH	240
	241	if (device_may_wakeup(&pdev->dev))
	242	enable_irq_wake(rotary->irq);
	243
	244	return 0;
	245	}
	246
5ec662e7	247	static int __maybe_unused bfin_rotary_resume(struct device *dev)
48329582 MH	248	{
	249	struct platform_device *pdev = to_platform_device(dev);
	250	struct bfin_rot *rotary = platform_get_drvdata(pdev);
	251
71adf22f SZ	252	writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
	253	writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
	254	writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);
48329582 MH	255
	256	if (device_may_wakeup(&pdev->dev))
	257	disable_irq_wake(rotary->irq);
	258
	259	if (rotary->cnt_config & CNTE)
71adf22f	260	writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);
48329582 MH	261
	262	return 0;
	263	}
	264
5ec662e7 DT	265	static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
5ec662e7 DT	266	bfin_rotary_suspend, bfin_rotary_resume);
48329582 MH	267
	268	static struct platform_driver bfin_rotary_device_driver = {
	269	.probe = bfin_rotary_probe,
1cb0aa88	270	.remove = bfin_rotary_remove,
48329582 MH	271	.driver = {
48329582 MH	272	.name = "bfin-rotary",
48329582	273	.pm = &bfin_rotary_pm_ops,
48329582 MH	274	},
48329582 MH	275	};
840a746b	276	module_platform_driver(bfin_rotary_device_driver);
48329582 MH	277
	278	MODULE_LICENSE("GPL");
	279	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	280	MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
	281	MODULE_ALIAS("platform:bfin-rotary");