Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 201 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-pca-isa.c b/drivers/i2c/busses/i2c-pca-isa.c
new file mode 100644
index 000000000..85e8cf58e
--- /dev/null
+++ b/drivers/i2c/busses/i2c-pca-isa.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  i2c-pca-isa.c driver for PCA9564 on ISA boards
+ *    Copyright (C) 2004 Arcom Control Systems
+ *    Copyright (C) 2008 Pengutronix
+ */
+
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/isa.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-pca.h>
+#include <linux/io.h>
+
+#include <asm/irq.h>
+
+#define DRIVER "i2c-pca-isa"
+#define IO_SIZE 4
+
+static unsigned long base;
+static int irq = -1;
+
+/* Data sheet recommends 59kHz for 100kHz operation due to variation
+ * in the actual clock rate */
+static int clock  = 59000;
+
+static struct i2c_adapter pca_isa_ops;
+static wait_queue_head_t pca_wait;
+
+static void pca_isa_writebyte(void *pd, int reg, int val)
+{
+#ifdef DEBUG_IO
+	static char *names[] = { "T/O", "DAT", "ADR", "CON" };
+	printk(KERN_DEBUG "*** write %s at %#lx <= %#04x\n", names[reg],
+	       base+reg, val);
+#endif
+	outb(val, base+reg);
+}
+
+static int pca_isa_readbyte(void *pd, int reg)
+{
+	int res = inb(base+reg);
+#ifdef DEBUG_IO
+	{
+		static char *names[] = { "STA", "DAT", "ADR", "CON" };
+		printk(KERN_DEBUG "*** read  %s => %#04x\n", names[reg], res);
+	}
+#endif
+	return res;
+}
+
+static int pca_isa_waitforcompletion(void *pd)
+{
+	unsigned long timeout;
+	long ret;
+
+	if (irq > -1) {
+		ret = wait_event_timeout(pca_wait,
+				pca_isa_readbyte(pd, I2C_PCA_CON)
+				& I2C_PCA_CON_SI, pca_isa_ops.timeout);
+	} else {
+		/* Do polling */
+		timeout = jiffies + pca_isa_ops.timeout;
+		do {
+			ret = time_before(jiffies, timeout);
+			if (pca_isa_readbyte(pd, I2C_PCA_CON)
+					& I2C_PCA_CON_SI)
+				break;
+			udelay(100);
+		} while (ret);
+	}
+
+	return ret > 0;
+}
+
+static void pca_isa_resetchip(void *pd)
+{
+	/* apparently only an external reset will do it. not a lot can be done */
+	printk(KERN_WARNING DRIVER ": Haven't figured out how to do a reset yet\n");
+}
+
+static irqreturn_t pca_handler(int this_irq, void *dev_id) {
+	wake_up(&pca_wait);
+	return IRQ_HANDLED;
+}
+
+static struct i2c_algo_pca_data pca_isa_data = {
+	/* .data intentionally left NULL, not needed with ISA */
+	.write_byte		= pca_isa_writebyte,
+	.read_byte		= pca_isa_readbyte,
+	.wait_for_completion	= pca_isa_waitforcompletion,
+	.reset_chip		= pca_isa_resetchip,
+};
+
+static struct i2c_adapter pca_isa_ops = {
+	.owner          = THIS_MODULE,
+	.algo_data	= &pca_isa_data,
+	.name		= "PCA9564/PCA9665 ISA Adapter",
+	.timeout	= HZ,
+};
+
+static int pca_isa_match(struct device *dev, unsigned int id)
+{
+	int match = base != 0;
+
+	if (match) {
+		if (irq <= -1)
+			dev_warn(dev, "Using polling mode (specify irq)\n");
+	} else
+		dev_err(dev, "Please specify I/O base\n");
+
+	return match;
+}
+
+static int pca_isa_probe(struct device *dev, unsigned int id)
+{
+	init_waitqueue_head(&pca_wait);
+
+	dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq);
+
+#ifdef CONFIG_PPC
+	if (check_legacy_ioport(base)) {
+		dev_err(dev, "I/O address %#08lx is not available\n", base);
+		goto out;
+	}
+#endif
+
+	if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {
+		dev_err(dev, "I/O address %#08lx is in use\n", base);
+		goto out;
+	}
+
+	if (irq > -1) {
+		if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) {
+			dev_err(dev, "Request irq%d failed\n", irq);
+			goto out_region;
+		}
+	}
+
+	pca_isa_data.i2c_clock = clock;
+	if (i2c_pca_add_bus(&pca_isa_ops) < 0) {
+		dev_err(dev, "Failed to add i2c bus\n");
+		goto out_irq;
+	}
+
+	return 0;
+
+ out_irq:
+	if (irq > -1)
+		free_irq(irq, &pca_isa_ops);
+ out_region:
+	release_region(base, IO_SIZE);
+ out:
+	return -ENODEV;
+}
+
+static void pca_isa_remove(struct device *dev, unsigned int id)
+{
+	i2c_del_adapter(&pca_isa_ops);
+
+	if (irq > -1) {
+		disable_irq(irq);
+		free_irq(irq, &pca_isa_ops);
+	}
+	release_region(base, IO_SIZE);
+}
+
+static struct isa_driver pca_isa_driver = {
+	.match		= pca_isa_match,
+	.probe		= pca_isa_probe,
+	.remove		= pca_isa_remove,
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= DRIVER,
+	}
+};
+
+MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
+MODULE_DESCRIPTION("ISA base PCA9564/PCA9665 driver");
+MODULE_LICENSE("GPL");
+
+module_param_hw(base, ulong, ioport, 0);
+MODULE_PARM_DESC(base, "I/O base address");
+module_param_hw(irq, int, irq, 0);
+MODULE_PARM_DESC(irq, "IRQ");
+module_param(clock, int, 0);
+MODULE_PARM_DESC(clock, "Clock rate in hertz.\n\t\t"
+		"For PCA9564: 330000,288000,217000,146000,"
+		"88000,59000,44000,36000\n"
+		"\t\tFor PCA9665:\tStandard: 60300 - 100099\n"
+		"\t\t\t\tFast: 100100 - 400099\n"
+		"\t\t\t\tFast+: 400100 - 10000099\n"
+		"\t\t\t\tTurbo: Up to 1265800");
+module_isa_driver(pca_isa_driver, 1);