[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / spi / spi-tle62x0.c

/*
 * Support Infineon TLE62x0 driver chips
 *
 * Copyright (c) 2007 Simtec Electronics
 *	Ben Dooks, <ben@simtec.co.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <linux/spi/spi.h>
#include <linux/spi/tle62x0.h>


#define CMD_READ	0x00
#define CMD_SET		0xff

#define DIAG_NORMAL	0x03
#define DIAG_OVERLOAD	0x02
#define DIAG_OPEN	0x01
#define DIAG_SHORTGND	0x00

struct tle62x0_state {
	struct spi_device	*us;
	struct mutex		lock;
	unsigned int		nr_gpio;
	unsigned int		gpio_state;

	unsigned char		tx_buff[4];
	unsigned char		rx_buff[4];
};

static int to_gpio_num(struct device_attribute *attr);

static inline int tle62x0_write(struct tle62x0_state *st)
{
	unsigned char *buff = st->tx_buff;
	unsigned int gpio_state = st->gpio_state;

	buff[0] = CMD_SET;

	if (st->nr_gpio == 16) {
		buff[1] = gpio_state >> 8;
		buff[2] = gpio_state;
	} else {
		buff[1] = gpio_state;
	}

	dev_dbg(&st->us->dev, "buff %02x,%02x,%02x\n",
		buff[0], buff[1], buff[2]);

	return spi_write(st->us, buff, (st->nr_gpio == 16) ? 3 : 2);
}

static inline int tle62x0_read(struct tle62x0_state *st)
{
	unsigned char *txbuff = st->tx_buff;
	struct spi_transfer xfer = {
		.tx_buf		= txbuff,
		.rx_buf		= st->rx_buff,
		.len		= (st->nr_gpio * 2) / 8,
	};
	struct spi_message msg;

	txbuff[0] = CMD_READ;
	txbuff[1] = 0x00;
	txbuff[2] = 0x00;
	txbuff[3] = 0x00;

	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	return spi_sync(st->us, &msg);
}

static unsigned char *decode_fault(unsigned int fault_code)
{
	fault_code &= 3;

	switch (fault_code) {
	case DIAG_NORMAL:
		return "N";
	case DIAG_OVERLOAD:
		return "V";
	case DIAG_OPEN:
		return "O";
	case DIAG_SHORTGND:
		return "G";
	}

	return "?";
}

static ssize_t tle62x0_status_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct tle62x0_state *st = dev_get_drvdata(dev);
	char *bp = buf;
	unsigned char *buff = st->rx_buff;
	unsigned long fault = 0;
	int ptr;
	int ret;

	mutex_lock(&st->lock);
	ret = tle62x0_read(st);
	dev_dbg(dev, "tle62x0_read() returned %d\n", ret);
	if (ret < 0) {
		mutex_unlock(&st->lock);
		return ret;
	}

	for (ptr = 0; ptr < (st->nr_gpio * 2)/8; ptr += 1) {
		fault <<= 8;
		fault  |= ((unsigned long)buff[ptr]);

		dev_dbg(dev, "byte %d is %02x\n", ptr, buff[ptr]);
	}

	for (ptr = 0; ptr < st->nr_gpio; ptr++) {
		bp += sprintf(bp, "%s ", decode_fault(fault >> (ptr * 2)));
	}

	*bp++ = '\n';

	mutex_unlock(&st->lock);
	return bp - buf;
}

static DEVICE_ATTR(status_show, S_IRUGO, tle62x0_status_show, NULL);

static ssize_t tle62x0_gpio_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct tle62x0_state *st = dev_get_drvdata(dev);
	int gpio_num = to_gpio_num(attr);
	int value;

	mutex_lock(&st->lock);
	value = (st->gpio_state >> gpio_num) & 1;
	mutex_unlock(&st->lock);

	return snprintf(buf, PAGE_SIZE, "%d", value);
}

static ssize_t tle62x0_gpio_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t len)
{
	struct tle62x0_state *st = dev_get_drvdata(dev);
	int gpio_num = to_gpio_num(attr);
	unsigned long val;
	char *endp;

	val = simple_strtoul(buf, &endp, 0);
	if (buf == endp)
		return -EINVAL;

	dev_dbg(dev, "setting gpio %d to %ld\n", gpio_num, val);

	mutex_lock(&st->lock);

	if (val)
		st->gpio_state |= 1 << gpio_num;
	else
		st->gpio_state &= ~(1 << gpio_num);

	tle62x0_write(st);
	mutex_unlock(&st->lock);

	return len;
}

static DEVICE_ATTR(gpio1, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio2, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio3, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio4, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio5, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio6, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio7, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio8, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio9, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio10, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio11, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio12, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio13, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio14, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio15, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);
static DEVICE_ATTR(gpio16, S_IWUSR|S_IRUGO,
		tle62x0_gpio_show, tle62x0_gpio_store);

static struct device_attribute *gpio_attrs[] = {
	[0]		= &dev_attr_gpio1,
	[1]		= &dev_attr_gpio2,
	[2]		= &dev_attr_gpio3,
	[3]		= &dev_attr_gpio4,
	[4]		= &dev_attr_gpio5,
	[5]		= &dev_attr_gpio6,
	[6]		= &dev_attr_gpio7,
	[7]		= &dev_attr_gpio8,
	[8]		= &dev_attr_gpio9,
	[9]		= &dev_attr_gpio10,
	[10]		= &dev_attr_gpio11,
	[11]		= &dev_attr_gpio12,
	[12]		= &dev_attr_gpio13,
	[13]		= &dev_attr_gpio14,
	[14]		= &dev_attr_gpio15,
	[15]		= &dev_attr_gpio16
};

static int to_gpio_num(struct device_attribute *attr)
{
	int ptr;

	for (ptr = 0; ptr < ARRAY_SIZE(gpio_attrs); ptr++) {
		if (gpio_attrs[ptr] == attr)
			return ptr;
	}

	return -1;
}

static int tle62x0_probe(struct spi_device *spi)
{
	struct tle62x0_state *st;
	struct tle62x0_pdata *pdata;
	int ptr;
	int ret;

	pdata = spi->dev.platform_data;
	if (pdata == NULL) {
		dev_err(&spi->dev, "no device data specified\n");
		return -EINVAL;
	}

	st = kzalloc(sizeof(struct tle62x0_state), GFP_KERNEL);
	if (st == NULL) {
		dev_err(&spi->dev, "no memory for device state\n");
		return -ENOMEM;
	}

	st->us = spi;
	st->nr_gpio = pdata->gpio_count;
	st->gpio_state = pdata->init_state;

	mutex_init(&st->lock);

	ret = device_create_file(&spi->dev, &dev_attr_status_show);
	if (ret) {
		dev_err(&spi->dev, "cannot create status attribute\n");
		goto err_status;
	}

	for (ptr = 0; ptr < pdata->gpio_count; ptr++) {
		ret = device_create_file(&spi->dev, gpio_attrs[ptr]);
		if (ret) {
			dev_err(&spi->dev, "cannot create gpio attribute\n");
			goto err_gpios;
		}
	}

	/* tle62x0_write(st); */
	spi_set_drvdata(spi, st);
	return 0;

 err_gpios:
	while (--ptr >= 0)
		device_remove_file(&spi->dev, gpio_attrs[ptr]);

	device_remove_file(&spi->dev, &dev_attr_status_show);

 err_status:
	kfree(st);
	return ret;
}

static int tle62x0_remove(struct spi_device *spi)
{
	struct tle62x0_state *st = spi_get_drvdata(spi);
	int ptr;

	for (ptr = 0; ptr < st->nr_gpio; ptr++)
		device_remove_file(&spi->dev, gpio_attrs[ptr]);

	device_remove_file(&spi->dev, &dev_attr_status_show);
	kfree(st);
	return 0;
}

static struct spi_driver tle62x0_driver = {
	.driver = {
		.name	= "tle62x0",
		.owner	= THIS_MODULE,
	},
	.probe		= tle62x0_probe,
	.remove		= tle62x0_remove,
};

module_spi_driver(tle62x0_driver);

MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("TLE62x0 SPI driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:tle62x0");
Commit	Line	Data
447aef1a	1	/*
ca632f55	2	* Support Infineon TLE62x0 driver chips
447aef1a BD	3	*
	4	* Copyright (c) 2007 Simtec Electronics
	5	* Ben Dooks, <ben@simtec.co.uk>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/device.h>
	13	#include <linux/kernel.h>
d7614de4	14	#include <linux/module.h>
5a0e3ad6	15	#include <linux/slab.h>
447aef1a BD	16
	17	#include <linux/spi/spi.h>
	18	#include <linux/spi/tle62x0.h>
	19
	20
	21	#define CMD_READ 0x00
	22	#define CMD_SET 0xff
	23
	24	#define DIAG_NORMAL 0x03
	25	#define DIAG_OVERLOAD 0x02
	26	#define DIAG_OPEN 0x01
	27	#define DIAG_SHORTGND 0x00
	28
	29	struct tle62x0_state {
	30	struct spi_device *us;
	31	struct mutex lock;
	32	unsigned int nr_gpio;
	33	unsigned int gpio_state;
	34
	35	unsigned char tx_buff[4];
	36	unsigned char rx_buff[4];
	37	};
	38
	39	static int to_gpio_num(struct device_attribute *attr);
	40
	41	static inline int tle62x0_write(struct tle62x0_state *st)
	42	{
	43	unsigned char *buff = st->tx_buff;
	44	unsigned int gpio_state = st->gpio_state;
	45
	46	buff[0] = CMD_SET;
	47
	48	if (st->nr_gpio == 16) {
	49	buff[1] = gpio_state >> 8;
	50	buff[2] = gpio_state;
	51	} else {
	52	buff[1] = gpio_state;
	53	}
	54
	55	dev_dbg(&st->us->dev, "buff %02x,%02x,%02x\n",
	56	buff[0], buff[1], buff[2]);
	57
	58	return spi_write(st->us, buff, (st->nr_gpio == 16) ? 3 : 2);
	59	}
	60
	61	static inline int tle62x0_read(struct tle62x0_state *st)
	62	{
	63	unsigned char *txbuff = st->tx_buff;
	64	struct spi_transfer xfer = {
	65	.tx_buf = txbuff,
	66	.rx_buf = st->rx_buff,
	67	.len = (st->nr_gpio * 2) / 8,
	68	};
	69	struct spi_message msg;
	70
	71	txbuff[0] = CMD_READ;
	72	txbuff[1] = 0x00;
	73	txbuff[2] = 0x00;
	74	txbuff[3] = 0x00;
	75
	76	spi_message_init(&msg);
	77	spi_message_add_tail(&xfer, &msg);
	78
	79	return spi_sync(st->us, &msg);
80	}
81
82	static unsigned char *decode_fault(unsigned int fault_code)
83	{
84	fault_code &= 3;
85
86	switch (fault_code) {
87	case DIAG_NORMAL:
88	return "N";
89	case DIAG_OVERLOAD:
90	return "V";
91	case DIAG_OPEN:
92	return "O";
93	case DIAG_SHORTGND:
94	return "G";
95	}
96
97	return "?";
98	}
99
100	static ssize_t tle62x0_status_show(struct device *dev,
101	struct device_attribute attr, char buf)
102	{
103	struct tle62x0_state *st = dev_get_drvdata(dev);
104	char *bp = buf;
105	unsigned char *buff = st->rx_buff;
106	unsigned long fault = 0;
107	int ptr;
108	int ret;
109
110	mutex_lock(&st->lock);
111	ret = tle62x0_read(st);
447aef1a	112	dev_dbg(dev, "tle62x0_read() returned %d\n", ret);
822bd5aa DB	113	if (ret < 0) {
	114	mutex_unlock(&st->lock);
	115	return ret;
	116	}
447aef1a BD	117
	118	for (ptr = 0; ptr < (st->nr_gpio * 2)/8; ptr += 1) {
	119	fault <<= 8;
	120	fault \|= ((unsigned long)buff[ptr]);
	121
	122	dev_dbg(dev, "byte %d is %02x\n", ptr, buff[ptr]);
	123	}
	124
	125	for (ptr = 0; ptr < st->nr_gpio; ptr++) {
	126	bp += sprintf(bp, "%s ", decode_fault(fault >> (ptr * 2)));
	127	}
	128
	129	*bp++ = '\n';
	130
	131	mutex_unlock(&st->lock);
	132	return bp - buf;
	133	}
	134
	135	static DEVICE_ATTR(status_show, S_IRUGO, tle62x0_status_show, NULL);
	136
	137	static ssize_t tle62x0_gpio_show(struct device *dev,
	138	struct device_attribute attr, char buf)
	139	{
	140	struct tle62x0_state *st = dev_get_drvdata(dev);
	141	int gpio_num = to_gpio_num(attr);
	142	int value;
	143
	144	mutex_lock(&st->lock);
	145	value = (st->gpio_state >> gpio_num) & 1;
	146	mutex_unlock(&st->lock);
	147
	148	return snprintf(buf, PAGE_SIZE, "%d", value);
	149	}
	150
	151	static ssize_t tle62x0_gpio_store(struct device *dev,
	152	struct device_attribute *attr,
	153	const char *buf, size_t len)
	154	{
	155	struct tle62x0_state *st = dev_get_drvdata(dev);
	156	int gpio_num = to_gpio_num(attr);
	157	unsigned long val;
	158	char *endp;
	159
	160	val = simple_strtoul(buf, &endp, 0);
	161	if (buf == endp)
	162	return -EINVAL;
	163
	164	dev_dbg(dev, "setting gpio %d to %ld\n", gpio_num, val);
	165
	166	mutex_lock(&st->lock);
	167
	168	if (val)
	169	st->gpio_state \|= 1 << gpio_num;
	170	else
	171	st->gpio_state &= ~(1 << gpio_num);
	172
	173	tle62x0_write(st);
	174	mutex_unlock(&st->lock);
	175
	176	return len;
	177	}
	178
	179	static DEVICE_ATTR(gpio1, S_IWUSR\|S_IRUGO,
	180	tle62x0_gpio_show, tle62x0_gpio_store);
181	static DEVICE_ATTR(gpio2, S_IWUSR\|S_IRUGO,
182	tle62x0_gpio_show, tle62x0_gpio_store);
183	static DEVICE_ATTR(gpio3, S_IWUSR\|S_IRUGO,
184	tle62x0_gpio_show, tle62x0_gpio_store);
185	static DEVICE_ATTR(gpio4, S_IWUSR\|S_IRUGO,
186	tle62x0_gpio_show, tle62x0_gpio_store);
187	static DEVICE_ATTR(gpio5, S_IWUSR\|S_IRUGO,
188	tle62x0_gpio_show, tle62x0_gpio_store);
189	static DEVICE_ATTR(gpio6, S_IWUSR\|S_IRUGO,
190	tle62x0_gpio_show, tle62x0_gpio_store);
191	static DEVICE_ATTR(gpio7, S_IWUSR\|S_IRUGO,
192	tle62x0_gpio_show, tle62x0_gpio_store);
193	static DEVICE_ATTR(gpio8, S_IWUSR\|S_IRUGO,
194	tle62x0_gpio_show, tle62x0_gpio_store);
195	static DEVICE_ATTR(gpio9, S_IWUSR\|S_IRUGO,
196	tle62x0_gpio_show, tle62x0_gpio_store);
197	static DEVICE_ATTR(gpio10, S_IWUSR\|S_IRUGO,
198	tle62x0_gpio_show, tle62x0_gpio_store);
199	static DEVICE_ATTR(gpio11, S_IWUSR\|S_IRUGO,
200	tle62x0_gpio_show, tle62x0_gpio_store);
201	static DEVICE_ATTR(gpio12, S_IWUSR\|S_IRUGO,
202	tle62x0_gpio_show, tle62x0_gpio_store);
203	static DEVICE_ATTR(gpio13, S_IWUSR\|S_IRUGO,
204	tle62x0_gpio_show, tle62x0_gpio_store);
205	static DEVICE_ATTR(gpio14, S_IWUSR\|S_IRUGO,
206	tle62x0_gpio_show, tle62x0_gpio_store);
207	static DEVICE_ATTR(gpio15, S_IWUSR\|S_IRUGO,
208	tle62x0_gpio_show, tle62x0_gpio_store);
209	static DEVICE_ATTR(gpio16, S_IWUSR\|S_IRUGO,
210	tle62x0_gpio_show, tle62x0_gpio_store);
211
212	static struct device_attribute *gpio_attrs[] = {
213	[0] = &dev_attr_gpio1,
214	[1] = &dev_attr_gpio2,
215	[2] = &dev_attr_gpio3,
216	[3] = &dev_attr_gpio4,
217	[4] = &dev_attr_gpio5,
218	[5] = &dev_attr_gpio6,
219	[6] = &dev_attr_gpio7,
220	[7] = &dev_attr_gpio8,
221	[8] = &dev_attr_gpio9,
222	[9] = &dev_attr_gpio10,
223	[10] = &dev_attr_gpio11,
224	[11] = &dev_attr_gpio12,
225	[12] = &dev_attr_gpio13,
226	[13] = &dev_attr_gpio14,
227	[14] = &dev_attr_gpio15,
228	[15] = &dev_attr_gpio16
229	};
230
231	static int to_gpio_num(struct device_attribute *attr)
232	{
233	int ptr;
234
235	for (ptr = 0; ptr < ARRAY_SIZE(gpio_attrs); ptr++) {
236	if (gpio_attrs[ptr] == attr)
237	return ptr;
238	}
239
240	return -1;
241	}
242
fd4a319b	243	static int tle62x0_probe(struct spi_device *spi)
447aef1a BD	244	{
	245	struct tle62x0_state *st;
	246	struct tle62x0_pdata *pdata;
	247	int ptr;
	248	int ret;
	249
	250	pdata = spi->dev.platform_data;
	251	if (pdata == NULL) {
	252	dev_err(&spi->dev, "no device data specified\n");
	253	return -EINVAL;
	254	}
	255
	256	st = kzalloc(sizeof(struct tle62x0_state), GFP_KERNEL);
	257	if (st == NULL) {
	258	dev_err(&spi->dev, "no memory for device state\n");
	259	return -ENOMEM;
	260	}
	261
	262	st->us = spi;
	263	st->nr_gpio = pdata->gpio_count;
	264	st->gpio_state = pdata->init_state;
	265
	266	mutex_init(&st->lock);
	267
	268	ret = device_create_file(&spi->dev, &dev_attr_status_show);
	269	if (ret) {
	270	dev_err(&spi->dev, "cannot create status attribute\n");
	271	goto err_status;
	272	}
	273
	274	for (ptr = 0; ptr < pdata->gpio_count; ptr++) {
	275	ret = device_create_file(&spi->dev, gpio_attrs[ptr]);
	276	if (ret) {
	277	dev_err(&spi->dev, "cannot create gpio attribute\n");
	278	goto err_gpios;
	279	}
	280	}
	281
	282	/* tle62x0_write(st); */
	283	spi_set_drvdata(spi, st);
	284	return 0;
	285
	286	err_gpios:
80b40370	287	while (--ptr >= 0)
447aef1a BD	288	device_remove_file(&spi->dev, gpio_attrs[ptr]);
	289
	290	device_remove_file(&spi->dev, &dev_attr_status_show);
	291
	292	err_status:
	293	kfree(st);
	294	return ret;
	295	}
	296
fd4a319b	297	static int tle62x0_remove(struct spi_device *spi)
447aef1a BD	298	{
	299	struct tle62x0_state *st = spi_get_drvdata(spi);
	300	int ptr;
	301
	302	for (ptr = 0; ptr < st->nr_gpio; ptr++)
	303	device_remove_file(&spi->dev, gpio_attrs[ptr]);
	304
80b40370	305	device_remove_file(&spi->dev, &dev_attr_status_show);
447aef1a BD	306	kfree(st);
	307	return 0;
	308	}
	309
	310	static struct spi_driver tle62x0_driver = {
	311	.driver = {
	312	.name = "tle62x0",
	313	.owner = THIS_MODULE,
	314	},
	315	.probe = tle62x0_probe,
fd4a319b	316	.remove = tle62x0_remove,
447aef1a BD	317	};
447aef1a BD	318
38e271cd	319	module_spi_driver(tle62x0_driver);
447aef1a BD	320
	321	MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
	322	MODULE_DESCRIPTION("TLE62x0 SPI driver");
	323	MODULE_LICENSE("GPL v2");
e0626e38	324	MODULE_ALIAS("spi:tle62x0");