[PATCH] Infineion TLE62X0 device driver

[PATCH] Infineion TLE62X0 device driver

[Ben Dooks]

Add support for the Infineon TLE62x0 series of low-side driver
chips, such as the TLE6220 or TLE6230.

Signed-off-by: Ben Dooks <ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org>

Index: linux-2.6.22-rc4-simtec/include/linux/spi/tle62x0.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.22-rc4-simtec/include/linux/spi/tle62x0.h	2007-06-05 19:14:07.000000000 +0100
@@ -0,0 +1,23 @@
+/* include/linux/spi/tle62x0.h
+ *
+ * Copyright 2007 Simtec Electronics
+ *	Ben Dooks <ben-Y5A6D6n0/KfQXOPxS62xeg@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+struct tle62x0_pdata {
+	unsigned int		init_state;
+	unsigned int		gpio_count;
+};
Index: linux-2.6.22-rc4-simtec/drivers/spi/Kconfig
===================================================================
--- linux-2.6.22-rc4-simtec.orig/drivers/spi/Kconfig	2007-06-05 18:27:11.000000000 +0100
+++ linux-2.6.22-rc4-simtec/drivers/spi/Kconfig	2007-06-05 19:14:07.000000000 +0100
@@ -160,6 +160,13 @@ config SPI_S3C24XX_GPIO
 # Add new SPI master controllers in alphabetical order above this line
 #
 
+config SPI_TLE62X0
+	tristate "Infineon TLE62X0"
+	depends on SPI_MASTER
+	help
+	  SPI driver for Infineion TLE62X0 series line driver chips,
+	  such as the TLE6220, TLE6230 and TLE6240.
+
 #
 # There are lots of SPI device types, with sensors and memory
 # being probably the most widely used ones.
Index: linux-2.6.22-rc4-simtec/drivers/spi/tle62x0.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.22-rc4-simtec/drivers/spi/tle62x0.c	2007-06-05 19:14:07.000000000 +0100
@@ -0,0 +1,312 @@
+/* drivers/spi/tle62x0.c
+ *
+ * Copyright (c) 2007 Simtec Electronics
+ *	Ben Dooks, <ben-Y5A6D6n0/KfQXOPxS62xeg@public.gmane.org>
+ *
+ * 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.
+ *
+ * Infineon TLE62x0 series driver
+*/
+
+#include <linux/device.h>
+#include <linux/kernel.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 int 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);
+
+	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, 0444, tle62x0_status_show, NULL);
+
+static int 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 int 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, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio2, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio3, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio4, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio5, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio6, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio7, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio8, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio9, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio10, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio11, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio12, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio13, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio14, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio15, 0644, tle62x0_gpio_show, tle62x0_gpio_store);
+static DEVICE_ATTR(gpio16, 0644, 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 __devinit 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(data);
+	spi_set_drvdata(spi, st);
+	return 0;
+
+ err_gpios:
+	for (; ptr > 0; ptr--)
+		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 __devexit 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]);
+
+	kfree(st);
+	return 0;
+}
+
+static struct spi_driver tle62x0_driver = {
+	.driver = {
+		.name	= "tle62x0",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= tle62x0_probe,
+	.remove		= __devexit_p(tle62x0_remove),
+};
+
+static __init int tle62x0_init(void)
+{
+	return spi_register_driver(&tle62x0_driver);
+}
+
+static __exit void tle62x0_exit(void)
+{
+	spi_unregister_driver(&tle62x0_driver);
+}
+
+module_init(tle62x0_init);
+module_exit(tle62x0_exit);
+
+MODULE_AUTHOR("Ben Dooks <ben-Y5A6D6n0/KfQXOPxS62xeg@public.gmane.org>");
+MODULE_DESCRIPTION("TLE62x0 SPI driver");
+MODULE_LICENSE("GPL v2");
Index: linux-2.6.22-rc4-simtec/drivers/spi/Makefile
===================================================================
--- linux-2.6.22-rc4-simtec.orig/drivers/spi/Makefile	2007-06-05 19:14:22.000000000 +0100
+++ linux-2.6.22-rc4-simtec/drivers/spi/Makefile	2007-06-05 19:14:46.000000000 +0100
@@ -28,6 +28,7 @@ obj-$(CONFIG_SPI_S3C24XX)		+= spi_s3c24x
 # SPI protocol drivers (device/link on bus)
 obj-$(CONFIG_SPI_AT25)		+= at25.o
 obj-$(CONFIG_SPI_SPIDEV)	+= spidev.o
+obj-$(CONFIG_SPI_TLE62X0)	+= tle62x0.o
 # 	... add above this line ...
 
 # SPI slave controller drivers (upstream link)

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Re: [PATCH] Infineion TLE62X0 device driver

[David Brownell]

On Tuesday 05 June 2007, Ben Dooks wrote:
> Add support for the Infineon TLE62x0 series of low-side driver
> chips, such as the TLE6220 or TLE6230.

I forwarded a version with minor updates/fixes; thanks.

Ben, you might consider getting rid of the separate "status"
file for diagnostic info and just bundling that with as part
of each individual line's status ... it seems odd to view
that apart from whether the switch is e.g. on or not, and
there are sysfs fascists who object to multi-valued files.

Also, it looked to me like the init_state should have been
fed to the chip, rather than just assumed to be correct.

- Dave


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