Eric Lee / smarc-fsl-linux-kernel

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drivers/spi/spi-tle62x0.c 7.02 KB
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d2912cb15   Thomas Gleixner   treewide: Replace... 
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  // SPDX-License-Identifier: GPL-2.0-only
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  /*
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   * Support Infineon TLE62x0 driver chips
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   *
   * Copyright (c) 2007 Simtec Electronics
   *	Ben Dooks, <ben@simtec.co.uk>
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   */
  
  #include <linux/device.h>
  #include <linux/kernel.h>
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  #include <linux/module.h>
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  #include <linux/slab.h>
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  #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;
  	}
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  	dev_dbg(&st->us->dev, "buff %3ph
  ", buff);
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  	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);
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  	dev_dbg(dev, "tle62x0_read() returned %d
  ", ret);
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  	if (ret < 0) {
  		mutex_unlock(&st->lock);
  		return ret;
  	}
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  	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
  ", ptr, buff[ptr]);
  	}
  
  	for (ptr = 0; ptr < st->nr_gpio; ptr++) {
  		bp += sprintf(bp, "%s ", decode_fault(fault >> (ptr * 2)));
  	}
  
  	*bp++ = '
  ';
  
  	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
  ", 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;
  }
fd4a319bc   Grant Likely   spi: Remove HOTPL... 
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  static int tle62x0_probe(struct spi_device *spi)
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  {
  	struct tle62x0_state *st;
  	struct tle62x0_pdata *pdata;
  	int ptr;
  	int ret;
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  	pdata = dev_get_platdata(&spi->dev);
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  	if (pdata == NULL) {
  		dev_err(&spi->dev, "no device data specified
  ");
  		return -EINVAL;
  	}
  
  	st = kzalloc(sizeof(struct tle62x0_state), GFP_KERNEL);
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  	if (st == NULL)
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  		return -ENOMEM;
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  	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
  ");
  		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
  ");
  			goto err_gpios;
  		}
  	}
  
  	/* tle62x0_write(st); */
  	spi_set_drvdata(spi, st);
  	return 0;
  
   err_gpios:
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  	while (--ptr >= 0)
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  		device_remove_file(&spi->dev, gpio_attrs[ptr]);
  
  	device_remove_file(&spi->dev, &dev_attr_status_show);
  
   err_status:
  	kfree(st);
  	return ret;
  }
fd4a319bc   Grant Likely   spi: Remove HOTPL... 
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  static int tle62x0_remove(struct spi_device *spi)
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  {
  	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]);
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  	device_remove_file(&spi->dev, &dev_attr_status_show);
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  	kfree(st);
  	return 0;
  }
  
  static struct spi_driver tle62x0_driver = {
  	.driver = {
  		.name	= "tle62x0",
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  	},
  	.probe		= tle62x0_probe,
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  	.remove		= tle62x0_remove,
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  };
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  module_spi_driver(tle62x0_driver);
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  MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
  MODULE_DESCRIPTION("TLE62x0 SPI driver");
  MODULE_LICENSE("GPL v2");
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  MODULE_ALIAS("spi:tle62x0");