i2c: Add platform driver on top of the new pca-algorithm

Tested on a blackfin. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>

i2c: Add platform driver on top of the new pca-algorithm
Tested on a blackfin. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Wolfram Sang · Jean Delvare
1 parent c01b083105
Showing 4 changed files with 324 additions and 2 deletions Side-by-side Diff
drivers/i2c/busses/Kconfig
drivers/i2c/busses/Makefile
drivers/i2c/busses/i2c-pca-platform.c
include/linux/i2c-pca-platform.h
@@ -632,8 +632,8 @@
 	select I2C_ALGOPCA
 	default n
 	help
-	  This driver supports ISA boards using the Philips PCA 9564
-	  Parallel bus to I2C bus controller
+	  This driver supports ISA boards using the Philips PCA9564
+	  parallel bus to I2C bus controller.
  
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-pca-isa.
@@ -642,6 +642,17 @@
 	  system which doesn't have this device will result in long
 	  delays when I2C/SMBus chip drivers are loaded (e.g. at boot
 	  time).  If unsure, say N.
+
+config I2C_PCA_PLATFORM
+	tristate "PCA9564 as platform device"
+	select I2C_ALGOPCA
+	default n
+	help
+	  This driver supports a memory mapped Philips PCA9564
+	  parallel bus to I2C bus controller.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called i2c-pca-platform.
  
 config I2C_MV64XXX
 	tristate "Marvell mv64xxx I2C Controller"
@@ -30,6 +30,7 @@
 obj-$(CONFIG_I2C_PARPORT_LIGHT)	+= i2c-parport-light.o
 obj-$(CONFIG_I2C_PASEMI)	+= i2c-pasemi.o
 obj-$(CONFIG_I2C_PCA_ISA)	+= i2c-pca-isa.o
+obj-$(CONFIG_I2C_PCA_PLATFORM)	+= i2c-pca-platform.o
 obj-$(CONFIG_I2C_PIIX4)		+= i2c-piix4.o
 obj-$(CONFIG_I2C_PMCMSP)	+= i2c-pmcmsp.o
 obj-$(CONFIG_I2C_PNX)		+= i2c-pnx.o
+/*
+ *  i2c_pca_platform.c
+ *
+ *  Platform driver for the PCA9564 I2C controller.
+ *
+ *  Copyright (C) 2008 Pengutronix
+ *
+ *  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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/i2c-algo-pca.h>
+#include <linux/i2c-pca-platform.h>
+#include <linux/gpio.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#define res_len(r)		((r)->end - (r)->start + 1)
+
+struct i2c_pca_pf_data {
+	void __iomem			*reg_base;
+	int				irq;	/* if 0, use polling */
+	int				gpio;
+	wait_queue_head_t		wait;
+	struct i2c_adapter		adap;
+	struct i2c_algo_pca_data	algo_data;
+	unsigned long			io_base;
+	unsigned long			io_size;
+};
+
+/* Read/Write functions for different register alignments */
+
+static int i2c_pca_pf_readbyte8(void *pd, int reg)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+	return ioread8(i2c->reg_base + reg);
+}
+
+static int i2c_pca_pf_readbyte16(void *pd, int reg)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+	return ioread8(i2c->reg_base + reg * 2);
+}
+
+static int i2c_pca_pf_readbyte32(void *pd, int reg)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+	return ioread8(i2c->reg_base + reg * 4);
+}
+
+static void i2c_pca_pf_writebyte8(void *pd, int reg, int val)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+	iowrite8(val, i2c->reg_base + reg);
+}
+
+static void i2c_pca_pf_writebyte16(void *pd, int reg, int val)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+	iowrite8(val, i2c->reg_base + reg * 2);
+}
+
+static void i2c_pca_pf_writebyte32(void *pd, int reg, int val)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+	iowrite8(val, i2c->reg_base + reg * 4);
+}
+
+
+static int i2c_pca_pf_waitforcompletion(void *pd)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+	int ret = 0;
+
+	if (i2c->irq) {
+		ret = wait_event_interruptible(i2c->wait,
+			i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
+			& I2C_PCA_CON_SI);
+	} else {
+		/*
+		 * Do polling...
+		 * XXX: Could get stuck in extreme cases!
+		 *      Maybe add timeout, but using irqs is preferred anyhow.
+		 */
+		while ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
+				& I2C_PCA_CON_SI) == 0)
+			udelay(100);
+	}
+
+	return ret;
+}
+
+static void i2c_pca_pf_dummyreset(void *pd)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+	printk(KERN_WARNING "%s: No reset-pin found. Chip may get stuck!\n",
+		i2c->adap.name);
+}
+
+static void i2c_pca_pf_resetchip(void *pd)
+{
+	struct i2c_pca_pf_data *i2c = pd;
+
+	gpio_set_value(i2c->gpio, 0);
+	ndelay(100);
+	gpio_set_value(i2c->gpio, 1);
+}
+
+static irqreturn_t i2c_pca_pf_handler(int this_irq, void *dev_id)
+{
+	struct i2c_pca_pf_data *i2c = dev_id;
+
+	if ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
+		return IRQ_NONE;
+
+	wake_up_interruptible(&i2c->wait);
+
+	return IRQ_HANDLED;
+}
+
+
+static int __devinit i2c_pca_pf_probe(struct platform_device *pdev)
+{
+	struct i2c_pca_pf_data *i2c;
+	struct resource *res;
+	struct i2c_pca9564_pf_platform_data *platform_data =
+				pdev->dev.platform_data;
+	int ret = 0;
+	int irq;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irq = platform_get_irq(pdev, 0);
+	/* If irq is 0, we do polling. */
+
+	if (res == NULL) {
+		ret = -ENODEV;
+		goto e_print;
+	}
+
+	if (!request_mem_region(res->start, res_len(res), res->name)) {
+		ret = -ENOMEM;
+		goto e_print;
+	}
+
+	i2c = kzalloc(sizeof(struct i2c_pca_pf_data), GFP_KERNEL);
+	if (!i2c) {
+		ret = -ENOMEM;
+		goto e_alloc;
+	}
+
+	init_waitqueue_head(&i2c->wait);
+
+	i2c->reg_base = ioremap(res->start, res_len(res));
+	if (!i2c->reg_base) {
+		ret = -EIO;
+		goto e_remap;
+	}
+	i2c->io_base = res->start;
+	i2c->io_size = res_len(res);
+	i2c->irq = irq;
+
+	i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
+	i2c->adap.owner = THIS_MODULE;
+	snprintf(i2c->adap.name, sizeof(i2c->adap.name), "PCA9564 at 0x%08lx",
+		(unsigned long) res->start);
+	i2c->adap.algo_data = &i2c->algo_data;
+	i2c->adap.dev.parent = &pdev->dev;
+	i2c->adap.timeout = platform_data->timeout;
+
+	i2c->algo_data.i2c_clock = platform_data->i2c_clock_speed;
+	i2c->algo_data.data = i2c;
+
+	switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {
+	case IORESOURCE_MEM_32BIT:
+		i2c->algo_data.write_byte = i2c_pca_pf_writebyte32;
+		i2c->algo_data.read_byte = i2c_pca_pf_readbyte32;
+		break;
+	case IORESOURCE_MEM_16BIT:
+		i2c->algo_data.write_byte = i2c_pca_pf_writebyte16;
+		i2c->algo_data.read_byte = i2c_pca_pf_readbyte16;
+		break;
+	case IORESOURCE_MEM_8BIT:
+	default:
+		i2c->algo_data.write_byte = i2c_pca_pf_writebyte8;
+		i2c->algo_data.read_byte = i2c_pca_pf_readbyte8;
+		break;
+	}
+
+	i2c->algo_data.wait_for_completion = i2c_pca_pf_waitforcompletion;
+
+	i2c->gpio = platform_data->gpio;
+	i2c->algo_data.reset_chip = i2c_pca_pf_dummyreset;
+
+	/* Use gpio_is_valid() when in mainline */
+	if (i2c->gpio > -1) {
+		ret = gpio_request(i2c->gpio, i2c->adap.name);
+		if (ret == 0) {
+			gpio_direction_output(i2c->gpio, 1);
+			i2c->algo_data.reset_chip = i2c_pca_pf_resetchip;
+		} else {
+			printk(KERN_WARNING "%s: Registering gpio failed!\n",
+				i2c->adap.name);
+			i2c->gpio = ret;
+		}
+	}
+
+	if (irq) {
+		ret = request_irq(irq, i2c_pca_pf_handler,
+			IRQF_TRIGGER_FALLING, i2c->adap.name, i2c);
+		if (ret)
+			goto e_reqirq;
+	}
+
+	if (i2c_pca_add_numbered_bus(&i2c->adap) < 0) {
+		ret = -ENODEV;
+		goto e_adapt;
+	}
+
+	platform_set_drvdata(pdev, i2c);
+
+	printk(KERN_INFO "%s registered.\n", i2c->adap.name);
+
+	return 0;
+
+e_adapt:
+	if (irq)
+		free_irq(irq, i2c);
+e_reqirq:
+	if (i2c->gpio > -1)
+		gpio_free(i2c->gpio);
+
+	iounmap(i2c->reg_base);
+e_remap:
+	kfree(i2c);
+e_alloc:
+	release_mem_region(res->start, res_len(res));
+e_print:
+	printk(KERN_ERR "Registering PCA9564 FAILED! (%d)\n", ret);
+	return ret;
+}
+
+static int __devexit i2c_pca_pf_remove(struct platform_device *pdev)
+{
+	struct i2c_pca_pf_data *i2c = platform_get_drvdata(pdev);
+	platform_set_drvdata(pdev, NULL);
+
+	i2c_del_adapter(&i2c->adap);
+
+	if (i2c->irq)
+		free_irq(i2c->irq, i2c);
+
+	if (i2c->gpio > -1)
+		gpio_free(i2c->gpio);
+
+	iounmap(i2c->reg_base);
+	release_mem_region(i2c->io_base, i2c->io_size);
+	kfree(i2c);
+
+	return 0;
+}
+
+static struct platform_driver i2c_pca_pf_driver = {
+	.probe = i2c_pca_pf_probe,
+	.remove = __devexit_p(i2c_pca_pf_remove),
+	.driver = {
+		.name = "i2c-pca-platform",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init i2c_pca_pf_init(void)
+{
+	return platform_driver_register(&i2c_pca_pf_driver);
+}
+
+static void __exit i2c_pca_pf_exit(void)
+{
+	platform_driver_unregister(&i2c_pca_pf_driver);
+}
+
+MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
+MODULE_DESCRIPTION("I2C-PCA9564 platform driver");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_pca_pf_init);
+module_exit(i2c_pca_pf_exit);
+#ifndef I2C_PCA9564_PLATFORM_H
+#define I2C_PCA9564_PLATFORM_H
+
+struct i2c_pca9564_pf_platform_data {
+	int gpio;		/* pin to reset chip. driver will work when
+				 * not supplied (negative value), but it
+				 * cannot exit some error conditions then */
+	int i2c_clock_speed;	/* values are defined in linux/i2c-algo-pca.h */
+	int timeout;		/* timeout = this value * 10us */
+};
+
+#endif /* I2C_PCA9564_PLATFORM_H */
...	...	@@ -632,8 +632,8 @@
632	632	select I2C_ALGOPCA
633	633	default n
634	634	help
635		- This driver supports ISA boards using the Philips PCA 9564
636		- Parallel bus to I2C bus controller
	635	+ This driver supports ISA boards using the Philips PCA9564
	636	+ parallel bus to I2C bus controller.
637	637
638	638	This driver can also be built as a module. If so, the module
639	639	will be called i2c-pca-isa.
...	...	@@ -642,6 +642,17 @@
642	642	system which doesn't have this device will result in long
643	643	delays when I2C/SMBus chip drivers are loaded (e.g. at boot
644	644	time). If unsure, say N.
	645	+
	646	+config I2C_PCA_PLATFORM
	647	+ tristate "PCA9564 as platform device"
	648	+ select I2C_ALGOPCA
	649	+ default n
	650	+ help
	651	+ This driver supports a memory mapped Philips PCA9564
	652	+ parallel bus to I2C bus controller.
	653	+
	654	+ This driver can also be built as a module. If so, the module
	655	+ will be called i2c-pca-platform.
645	656
646	657	config I2C_MV64XXX
647	658	tristate "Marvell mv64xxx I2C Controller"
...	...	@@ -30,6 +30,7 @@
30	30	obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
31	31	obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
32	32	obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
	33	+obj-$(CONFIG_I2C_PCA_PLATFORM) += i2c-pca-platform.o
33	34	obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o
34	35	obj-$(CONFIG_I2C_PMCMSP) += i2c-pmcmsp.o
35	36	obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
	1	+/*
	2	+ * i2c_pca_platform.c
	3	+ *
	4	+ * Platform driver for the PCA9564 I2C controller.
	5	+ *
	6	+ * Copyright (C) 2008 Pengutronix
	7	+ *
	8	+ * This program is free software; you can redistribute it and/or modify
	9	+ * it under the terms of the GNU General Public License version 2 as
	10	+ * published by the Free Software Foundation.
	11	+
	12	+ */
	13	+#include <linux/kernel.h>
	14	+#include <linux/module.h>
	15	+#include <linux/init.h>
	16	+#include <linux/slab.h>
	17	+#include <linux/delay.h>
	18	+#include <linux/errno.h>
	19	+#include <linux/i2c.h>
	20	+#include <linux/interrupt.h>
	21	+#include <linux/platform_device.h>
	22	+#include <linux/i2c-algo-pca.h>
	23	+#include <linux/i2c-pca-platform.h>
	24	+#include <linux/gpio.h>
	25	+
	26	+#include <asm/irq.h>
	27	+#include <asm/io.h>
	28	+
	29	+#define res_len(r) ((r)->end - (r)->start + 1)
	30	+
	31	+struct i2c_pca_pf_data {
	32	+ void __iomem *reg_base;
	33	+ int irq; /* if 0, use polling */
	34	+ int gpio;
	35	+ wait_queue_head_t wait;
	36	+ struct i2c_adapter adap;
	37	+ struct i2c_algo_pca_data algo_data;
	38	+ unsigned long io_base;
	39	+ unsigned long io_size;
	40	+};
	41	+
	42	+/* Read/Write functions for different register alignments */
	43	+
	44	+static int i2c_pca_pf_readbyte8(void *pd, int reg)
	45	+{
	46	+ struct i2c_pca_pf_data *i2c = pd;
	47	+ return ioread8(i2c->reg_base + reg);
	48	+}
	49	+
	50	+static int i2c_pca_pf_readbyte16(void *pd, int reg)
	51	+{
	52	+ struct i2c_pca_pf_data *i2c = pd;
	53	+ return ioread8(i2c->reg_base + reg * 2);
	54	+}
	55	+
	56	+static int i2c_pca_pf_readbyte32(void *pd, int reg)
	57	+{
	58	+ struct i2c_pca_pf_data *i2c = pd;
	59	+ return ioread8(i2c->reg_base + reg * 4);
	60	+}
	61	+
	62	+static void i2c_pca_pf_writebyte8(void *pd, int reg, int val)
	63	+{
	64	+ struct i2c_pca_pf_data *i2c = pd;
	65	+ iowrite8(val, i2c->reg_base + reg);
	66	+}
	67	+
	68	+static void i2c_pca_pf_writebyte16(void *pd, int reg, int val)
	69	+{
	70	+ struct i2c_pca_pf_data *i2c = pd;
	71	+ iowrite8(val, i2c->reg_base + reg * 2);
	72	+}
	73	+
	74	+static void i2c_pca_pf_writebyte32(void *pd, int reg, int val)
	75	+{
	76	+ struct i2c_pca_pf_data *i2c = pd;
	77	+ iowrite8(val, i2c->reg_base + reg * 4);
	78	+}
	79	+
	80	+
	81	+static int i2c_pca_pf_waitforcompletion(void *pd)
	82	+{
	83	+ struct i2c_pca_pf_data *i2c = pd;
	84	+ int ret = 0;
	85	+
	86	+ if (i2c->irq) {
	87	+ ret = wait_event_interruptible(i2c->wait,
	88	+ i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
	89	+ & I2C_PCA_CON_SI);
	90	+ } else {
	91	+ /*
	92	+ * Do polling...
	93	+ * XXX: Could get stuck in extreme cases!
	94	+ * Maybe add timeout, but using irqs is preferred anyhow.
	95	+ */
	96	+ while ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
	97	+ & I2C_PCA_CON_SI) == 0)
	98	+ udelay(100);
	99	+ }
	100	+
	101	+ return ret;
	102	+}
	103	+
	104	+static void i2c_pca_pf_dummyreset(void *pd)
	105	+{
	106	+ struct i2c_pca_pf_data *i2c = pd;
	107	+ printk(KERN_WARNING "%s: No reset-pin found. Chip may get stuck!\n",
	108	+ i2c->adap.name);
	109	+}
	110	+
	111	+static void i2c_pca_pf_resetchip(void *pd)
	112	+{
	113	+ struct i2c_pca_pf_data *i2c = pd;
	114	+
	115	+ gpio_set_value(i2c->gpio, 0);
	116	+ ndelay(100);
	117	+ gpio_set_value(i2c->gpio, 1);
	118	+}
	119	+
	120	+static irqreturn_t i2c_pca_pf_handler(int this_irq, void *dev_id)
	121	+{
	122	+ struct i2c_pca_pf_data *i2c = dev_id;
	123	+
	124	+ if ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
	125	+ return IRQ_NONE;
	126	+
	127	+ wake_up_interruptible(&i2c->wait);
	128	+
	129	+ return IRQ_HANDLED;
	130	+}
	131	+
	132	+
	133	+static int __devinit i2c_pca_pf_probe(struct platform_device *pdev)
	134	+{
	135	+ struct i2c_pca_pf_data *i2c;
	136	+ struct resource *res;
	137	+ struct i2c_pca9564_pf_platform_data *platform_data =
	138	+ pdev->dev.platform_data;
	139	+ int ret = 0;
	140	+ int irq;
	141	+
	142	+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	143	+ irq = platform_get_irq(pdev, 0);
	144	+ /* If irq is 0, we do polling. */
	145	+
	146	+ if (res == NULL) {
	147	+ ret = -ENODEV;
	148	+ goto e_print;
	149	+ }
	150	+
	151	+ if (!request_mem_region(res->start, res_len(res), res->name)) {
	152	+ ret = -ENOMEM;
	153	+ goto e_print;
	154	+ }
	155	+
	156	+ i2c = kzalloc(sizeof(struct i2c_pca_pf_data), GFP_KERNEL);
	157	+ if (!i2c) {
	158	+ ret = -ENOMEM;
	159	+ goto e_alloc;
	160	+ }
	161	+
	162	+ init_waitqueue_head(&i2c->wait);
	163	+
	164	+ i2c->reg_base = ioremap(res->start, res_len(res));
	165	+ if (!i2c->reg_base) {
	166	+ ret = -EIO;
	167	+ goto e_remap;
	168	+ }
	169	+ i2c->io_base = res->start;
	170	+ i2c->io_size = res_len(res);
	171	+ i2c->irq = irq;
	172	+
	173	+ i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
	174	+ i2c->adap.owner = THIS_MODULE;
	175	+ snprintf(i2c->adap.name, sizeof(i2c->adap.name), "PCA9564 at 0x%08lx",
	176	+ (unsigned long) res->start);
	177	+ i2c->adap.algo_data = &i2c->algo_data;
	178	+ i2c->adap.dev.parent = &pdev->dev;
	179	+ i2c->adap.timeout = platform_data->timeout;
	180	+
	181	+ i2c->algo_data.i2c_clock = platform_data->i2c_clock_speed;
	182	+ i2c->algo_data.data = i2c;
	183	+
	184	+ switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {
	185	+ case IORESOURCE_MEM_32BIT:
	186	+ i2c->algo_data.write_byte = i2c_pca_pf_writebyte32;
	187	+ i2c->algo_data.read_byte = i2c_pca_pf_readbyte32;
	188	+ break;
	189	+ case IORESOURCE_MEM_16BIT:
	190	+ i2c->algo_data.write_byte = i2c_pca_pf_writebyte16;
	191	+ i2c->algo_data.read_byte = i2c_pca_pf_readbyte16;
	192	+ break;
	193	+ case IORESOURCE_MEM_8BIT:
	194	+ default:
	195	+ i2c->algo_data.write_byte = i2c_pca_pf_writebyte8;
	196	+ i2c->algo_data.read_byte = i2c_pca_pf_readbyte8;
	197	+ break;
	198	+ }
	199	+
	200	+ i2c->algo_data.wait_for_completion = i2c_pca_pf_waitforcompletion;
	201	+
	202	+ i2c->gpio = platform_data->gpio;
	203	+ i2c->algo_data.reset_chip = i2c_pca_pf_dummyreset;
	204	+
	205	+ /* Use gpio_is_valid() when in mainline */
	206	+ if (i2c->gpio > -1) {
	207	+ ret = gpio_request(i2c->gpio, i2c->adap.name);
	208	+ if (ret == 0) {
	209	+ gpio_direction_output(i2c->gpio, 1);
	210	+ i2c->algo_data.reset_chip = i2c_pca_pf_resetchip;
	211	+ } else {
	212	+ printk(KERN_WARNING "%s: Registering gpio failed!\n",
	213	+ i2c->adap.name);
	214	+ i2c->gpio = ret;
	215	+ }
	216	+ }
	217	+
	218	+ if (irq) {
	219	+ ret = request_irq(irq, i2c_pca_pf_handler,
	220	+ IRQF_TRIGGER_FALLING, i2c->adap.name, i2c);
	221	+ if (ret)
	222	+ goto e_reqirq;
	223	+ }
	224	+
	225	+ if (i2c_pca_add_numbered_bus(&i2c->adap) < 0) {
	226	+ ret = -ENODEV;
	227	+ goto e_adapt;
	228	+ }
	229	+
	230	+ platform_set_drvdata(pdev, i2c);
	231	+
	232	+ printk(KERN_INFO "%s registered.\n", i2c->adap.name);
	233	+
	234	+ return 0;
	235	+
	236	+e_adapt:
	237	+ if (irq)
	238	+ free_irq(irq, i2c);
	239	+e_reqirq:
	240	+ if (i2c->gpio > -1)
	241	+ gpio_free(i2c->gpio);
	242	+
	243	+ iounmap(i2c->reg_base);
	244	+e_remap:
	245	+ kfree(i2c);
	246	+e_alloc:
	247	+ release_mem_region(res->start, res_len(res));
	248	+e_print:
	249	+ printk(KERN_ERR "Registering PCA9564 FAILED! (%d)\n", ret);
	250	+ return ret;
	251	+}
	252	+
	253	+static int __devexit i2c_pca_pf_remove(struct platform_device *pdev)
	254	+{
	255	+ struct i2c_pca_pf_data *i2c = platform_get_drvdata(pdev);
	256	+ platform_set_drvdata(pdev, NULL);
	257	+
	258	+ i2c_del_adapter(&i2c->adap);
	259	+
	260	+ if (i2c->irq)
	261	+ free_irq(i2c->irq, i2c);
	262	+
	263	+ if (i2c->gpio > -1)
	264	+ gpio_free(i2c->gpio);
	265	+
	266	+ iounmap(i2c->reg_base);
	267	+ release_mem_region(i2c->io_base, i2c->io_size);
	268	+ kfree(i2c);
	269	+
	270	+ return 0;
	271	+}
	272	+
	273	+static struct platform_driver i2c_pca_pf_driver = {
	274	+ .probe = i2c_pca_pf_probe,
	275	+ .remove = __devexit_p(i2c_pca_pf_remove),
	276	+ .driver = {
	277	+ .name = "i2c-pca-platform",
	278	+ .owner = THIS_MODULE,
	279	+ },
	280	+};
	281	+
	282	+static int __init i2c_pca_pf_init(void)
	283	+{
	284	+ return platform_driver_register(&i2c_pca_pf_driver);
	285	+}
	286	+
	287	+static void __exit i2c_pca_pf_exit(void)
	288	+{
	289	+ platform_driver_unregister(&i2c_pca_pf_driver);
	290	+}
	291	+
	292	+MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
	293	+MODULE_DESCRIPTION("I2C-PCA9564 platform driver");
	294	+MODULE_LICENSE("GPL");
	295	+
	296	+module_init(i2c_pca_pf_init);
	297	+module_exit(i2c_pca_pf_exit);
	1	+#ifndef I2C_PCA9564_PLATFORM_H
	2	+#define I2C_PCA9564_PLATFORM_H
	3	+
	4	+struct i2c_pca9564_pf_platform_data {
	5	+ int gpio; /* pin to reset chip. driver will work when
	6	+ * not supplied (negative value), but it
	7	+ * cannot exit some error conditions then */
	8	+ int i2c_clock_speed; /* values are defined in linux/i2c-algo-pca.h */
	9	+ int timeout; /* timeout = this value * 10us */
	10	+};
	11	+
	12	+#endif /* I2C_PCA9564_PLATFORM_H */