SPI: tle620x power switch driver
Add support for the Infineon TLE62x0 series of low-side driver chips, such as the TLE6220 or TLE6230. These can be viewed as output GPIOs specialized for power switching applications. The driver provides a userspace interface to those GPIOs, and to the switch status they provide. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ben Dooks
Linus Torvalds
parent
da0abc275f
commit
447aef1a19
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@ -198,6 +198,15 @@ config SPI_SPIDEV
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Note that this application programming interface is EXPERIMENTAL
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and hence SUBJECT TO CHANGE WITHOUT NOTICE while it stabilizes.
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config SPI_TLE62X0
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tristate "Infineon TLE62X0 (for power switching)"
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depends on SPI_MASTER && SYSFS
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help
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SPI driver for Infineon TLE62X0 series line driver chips,
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such as the TLE6220, TLE6230 and TLE6240. This provides a
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sysfs interface, with each line presented as a kind of GPIO
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exposing both switch control and diagnostic feedback.
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#
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# Add new SPI protocol masters in alphabetical order above this line
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#
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@ -29,6 +29,7 @@ obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o
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# SPI protocol drivers (device/link on bus)
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obj-$(CONFIG_SPI_AT25) += at25.o
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obj-$(CONFIG_SPI_SPIDEV) += spidev.o
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obj-$(CONFIG_SPI_TLE62X0) += tle62x0.o
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# ... add above this line ...
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# SPI slave controller drivers (upstream link)
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@ -0,0 +1,328 @@
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/*
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* tle62x0.c -- support Infineon TLE62x0 driver chips
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*
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* Copyright (c) 2007 Simtec Electronics
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* Ben Dooks, <ben@simtec.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/tle62x0.h>
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#define CMD_READ 0x00
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#define CMD_SET 0xff
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#define DIAG_NORMAL 0x03
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#define DIAG_OVERLOAD 0x02
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#define DIAG_OPEN 0x01
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#define DIAG_SHORTGND 0x00
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struct tle62x0_state {
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struct spi_device *us;
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struct mutex lock;
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unsigned int nr_gpio;
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unsigned int gpio_state;
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unsigned char tx_buff[4];
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unsigned char rx_buff[4];
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};
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static int to_gpio_num(struct device_attribute *attr);
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static inline int tle62x0_write(struct tle62x0_state *st)
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{
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unsigned char *buff = st->tx_buff;
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unsigned int gpio_state = st->gpio_state;
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buff[0] = CMD_SET;
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if (st->nr_gpio == 16) {
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buff[1] = gpio_state >> 8;
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buff[2] = gpio_state;
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} else {
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buff[1] = gpio_state;
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}
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dev_dbg(&st->us->dev, "buff %02x,%02x,%02x\n",
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buff[0], buff[1], buff[2]);
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return spi_write(st->us, buff, (st->nr_gpio == 16) ? 3 : 2);
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}
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static inline int tle62x0_read(struct tle62x0_state *st)
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{
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unsigned char *txbuff = st->tx_buff;
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struct spi_transfer xfer = {
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.tx_buf = txbuff,
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.rx_buf = st->rx_buff,
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.len = (st->nr_gpio * 2) / 8,
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};
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struct spi_message msg;
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txbuff[0] = CMD_READ;
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txbuff[1] = 0x00;
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txbuff[2] = 0x00;
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txbuff[3] = 0x00;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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return spi_sync(st->us, &msg);
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}
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static unsigned char *decode_fault(unsigned int fault_code)
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{
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fault_code &= 3;
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switch (fault_code) {
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case DIAG_NORMAL:
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return "N";
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case DIAG_OVERLOAD:
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return "V";
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case DIAG_OPEN:
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return "O";
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case DIAG_SHORTGND:
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return "G";
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}
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return "?";
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}
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static ssize_t tle62x0_status_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct tle62x0_state *st = dev_get_drvdata(dev);
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char *bp = buf;
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unsigned char *buff = st->rx_buff;
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unsigned long fault = 0;
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int ptr;
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int ret;
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mutex_lock(&st->lock);
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ret = tle62x0_read(st);
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dev_dbg(dev, "tle62x0_read() returned %d\n", ret);
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for (ptr = 0; ptr < (st->nr_gpio * 2)/8; ptr += 1) {
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fault <<= 8;
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fault |= ((unsigned long)buff[ptr]);
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dev_dbg(dev, "byte %d is %02x\n", ptr, buff[ptr]);
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}
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for (ptr = 0; ptr < st->nr_gpio; ptr++) {
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bp += sprintf(bp, "%s ", decode_fault(fault >> (ptr * 2)));
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}
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*bp++ = '\n';
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mutex_unlock(&st->lock);
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return bp - buf;
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}
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static DEVICE_ATTR(status_show, S_IRUGO, tle62x0_status_show, NULL);
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static ssize_t tle62x0_gpio_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct tle62x0_state *st = dev_get_drvdata(dev);
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int gpio_num = to_gpio_num(attr);
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int value;
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mutex_lock(&st->lock);
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value = (st->gpio_state >> gpio_num) & 1;
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mutex_unlock(&st->lock);
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return snprintf(buf, PAGE_SIZE, "%d", value);
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}
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static ssize_t tle62x0_gpio_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct tle62x0_state *st = dev_get_drvdata(dev);
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int gpio_num = to_gpio_num(attr);
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unsigned long val;
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char *endp;
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val = simple_strtoul(buf, &endp, 0);
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if (buf == endp)
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return -EINVAL;
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dev_dbg(dev, "setting gpio %d to %ld\n", gpio_num, val);
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mutex_lock(&st->lock);
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if (val)
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st->gpio_state |= 1 << gpio_num;
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else
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st->gpio_state &= ~(1 << gpio_num);
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tle62x0_write(st);
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mutex_unlock(&st->lock);
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return len;
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}
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static DEVICE_ATTR(gpio1, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio2, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio3, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio4, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio5, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio6, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio7, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio8, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio9, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio10, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio11, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio12, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio13, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio14, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio15, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static DEVICE_ATTR(gpio16, S_IWUSR|S_IRUGO,
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tle62x0_gpio_show, tle62x0_gpio_store);
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static struct device_attribute *gpio_attrs[] = {
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[0] = &dev_attr_gpio1,
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[1] = &dev_attr_gpio2,
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[2] = &dev_attr_gpio3,
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[3] = &dev_attr_gpio4,
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[4] = &dev_attr_gpio5,
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[5] = &dev_attr_gpio6,
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[6] = &dev_attr_gpio7,
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[7] = &dev_attr_gpio8,
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[8] = &dev_attr_gpio9,
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[9] = &dev_attr_gpio10,
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[10] = &dev_attr_gpio11,
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[11] = &dev_attr_gpio12,
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[12] = &dev_attr_gpio13,
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[13] = &dev_attr_gpio14,
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[14] = &dev_attr_gpio15,
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[15] = &dev_attr_gpio16
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};
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static int to_gpio_num(struct device_attribute *attr)
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{
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int ptr;
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for (ptr = 0; ptr < ARRAY_SIZE(gpio_attrs); ptr++) {
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if (gpio_attrs[ptr] == attr)
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return ptr;
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}
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return -1;
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}
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static int __devinit tle62x0_probe(struct spi_device *spi)
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{
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struct tle62x0_state *st;
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struct tle62x0_pdata *pdata;
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int ptr;
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int ret;
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pdata = spi->dev.platform_data;
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if (pdata == NULL) {
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dev_err(&spi->dev, "no device data specified\n");
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return -EINVAL;
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}
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st = kzalloc(sizeof(struct tle62x0_state), GFP_KERNEL);
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if (st == NULL) {
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dev_err(&spi->dev, "no memory for device state\n");
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return -ENOMEM;
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}
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st->us = spi;
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st->nr_gpio = pdata->gpio_count;
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st->gpio_state = pdata->init_state;
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mutex_init(&st->lock);
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ret = device_create_file(&spi->dev, &dev_attr_status_show);
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if (ret) {
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dev_err(&spi->dev, "cannot create status attribute\n");
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goto err_status;
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}
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for (ptr = 0; ptr < pdata->gpio_count; ptr++) {
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ret = device_create_file(&spi->dev, gpio_attrs[ptr]);
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if (ret) {
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dev_err(&spi->dev, "cannot create gpio attribute\n");
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goto err_gpios;
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}
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}
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/* tle62x0_write(st); */
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spi_set_drvdata(spi, st);
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return 0;
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err_gpios:
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for (; ptr > 0; ptr--)
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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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err_status:
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kfree(st);
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return ret;
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}
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static int __devexit tle62x0_remove(struct spi_device *spi)
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{
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struct tle62x0_state *st = spi_get_drvdata(spi);
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int ptr;
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for (ptr = 0; ptr < st->nr_gpio; ptr++)
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device_remove_file(&spi->dev, gpio_attrs[ptr]);
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kfree(st);
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return 0;
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}
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static struct spi_driver tle62x0_driver = {
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.driver = {
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.name = "tle62x0",
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.owner = THIS_MODULE,
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},
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.probe = tle62x0_probe,
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.remove = __devexit_p(tle62x0_remove),
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};
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static __init int tle62x0_init(void)
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{
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return spi_register_driver(&tle62x0_driver);
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}
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static __exit void tle62x0_exit(void)
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{
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spi_unregister_driver(&tle62x0_driver);
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}
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module_init(tle62x0_init);
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module_exit(tle62x0_exit);
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MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
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MODULE_DESCRIPTION("TLE62x0 SPI driver");
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MODULE_LICENSE("GPL v2");
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@ -0,0 +1,24 @@
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/*
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* tle62x0.h - platform glue to Infineon TLE62x0 driver chips
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*
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* Copyright 2007 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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struct tle62x0_pdata {
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unsigned int init_state;
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unsigned int gpio_count;
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};
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