--- /dev/null
+/*
+ * drivers/i2c/chips/pca9535.c
+ *
+ * Driver for Philips PCA9535 16-bit low power I/O port with interrupt.
+ * Tested with OMAP-1510 based iPAQ h63xx series of mobile phones.
+ * (h6315, h6340 and h6365)
+ *
+ * Copyright (C) 2009 Mika Laitio
+ * Copyright (C) 2009 Husam Senussi
+ *
+ * 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, or
+ * (at your option) any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Copyright (C) 2005 Husam Senussi
+ * Framework based on Pawel Kolodziejski's pca9535 driver in
+ * handheld.org's 2.6.13 kernel. Driver updated by Mika Laitio.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon.h>
+#include <linux/err.h>
+
+#include <asm/arch/pca9535.h>
+#include <linux/delay.h>
+
+#include <linux/interrupt.h>
+#include <asm/mach-types.h>
+#include <asm/irq.h>
+#include <asm/mach/arch.h>
+#include <asm/hardware.h>
+
+EXPORT_SYMBOL(pca9535_gpio_read);
+EXPORT_SYMBOL(pca9535_gpio_write);
+EXPORT_SYMBOL(pca9535_gpio_direction);
+
+static int pca9535_attach_adapter(struct i2c_adapter *adapter);
+static int pca9535_detach_client(struct i2c_client *client);
+static int pca9535_attach(struct i2c_adapter *adapter, int address, int zero_or_minus_one);
+static u32 pca9535_read_reg(struct i2c_client *client, u8 regaddr);
+static void pca9535_write_reg(struct i2c_client *client, u8 regaddr, u16 param);
+
+enum pca9535_cmd
+{
+ PCA9535_INPUT_0 = 0,
+ PCA9535_INPUT_1 = 1,
+ PCA9535_OUTPUT_0 = 2,
+ PCA9535_OUTPUT_1 = 3,
+ PCA9535_INVERT_0 = 4,
+ PCA9535_INVERT_1 = 5,
+ PCA9535_DIRECTION_0 = 6,
+ PCA9535_DIRECTION_1 = 7,
+};
+
+struct pca9535_data {
+ struct semaphore lock;
+ struct i2c_client client;
+};
+
+static struct i2c_driver pca9535_driver = {
+ .driver = {
+ .name = "pca9535",
+ },
+ .attach_adapter = pca9535_attach_adapter,
+ .detach_client = pca9535_detach_client,
+};
+
+static struct i2c_client *pca9535_i2c_client = NULL;
+static struct pca9535_data pca9535_inited;
+
+static unsigned short normal_i2c[] = { 0x20, I2C_CLIENT_END };
+
+#define DRIVER_VERSION "20 OCT 2005"
+#define DRIVER_NAME "PCA9535"
+
+/*
+ * sysfs callback function.
+ */
+static ssize_t pca9535_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *psa = to_sensor_dev_attr(attr);
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%02X\n", (pca9535_read_reg(client, psa->index) >> 8));
+}
+
+/*
+ * sysfs callback function.
+ */
+static ssize_t pca9535_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *psa = to_sensor_dev_attr(attr);
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val = simple_strtoul(buf, NULL, 0);
+ unsigned long old = pca9535_read_reg(client, psa->index);
+
+ if (val > 0xff)
+ return -EINVAL;
+
+ val = (old & 0xff) | (val << 8);
+ pca9535_write_reg(client, psa->index, val);
+ return count;
+}
+
+#define PCA9535_ENTRY_RO(name, cmd_idx) \
+ static SENSOR_DEVICE_ATTR(name, S_IRUGO, pca9535_show, NULL, cmd_idx)
+
+#define PCA9535_ENTRY_RW(name, cmd_idx) \
+ static SENSOR_DEVICE_ATTR(name, S_IRUGO | S_IWUSR, pca9535_show, \
+ pca9535_store, cmd_idx)
+
+PCA9535_ENTRY_RO(input0, PCA9535_INPUT_0);
+PCA9535_ENTRY_RO(input1, PCA9535_INPUT_1);
+PCA9535_ENTRY_RW(output0, PCA9535_OUTPUT_0);
+PCA9535_ENTRY_RW(output1, PCA9535_OUTPUT_1);
+PCA9535_ENTRY_RW(invert0, PCA9535_INVERT_0);
+PCA9535_ENTRY_RW(invert1, PCA9535_INVERT_1);
+PCA9535_ENTRY_RW(direction0, PCA9535_DIRECTION_0);
+PCA9535_ENTRY_RW(direction1, PCA9535_DIRECTION_1);
+
+static struct attribute *pca9535_attributes[] = {
+ &sensor_dev_attr_input0.dev_attr.attr,
+ &sensor_dev_attr_input1.dev_attr.attr,
+ &sensor_dev_attr_output0.dev_attr.attr,
+ &sensor_dev_attr_output1.dev_attr.attr,
+ &sensor_dev_attr_invert0.dev_attr.attr,
+ &sensor_dev_attr_invert1.dev_attr.attr,
+ &sensor_dev_attr_direction0.dev_attr.attr,
+ &sensor_dev_attr_direction1.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group pca9535_defattr_group = {
+ .attrs = pca9535_attributes,
+};
+//End of sysfs management code.
+
+I2C_CLIENT_INSMOD;
+
+u32 pca9535_read_input(void)
+{
+ return pca9535_read_reg(pca9535_i2c_client, 0);
+}
+EXPORT_SYMBOL(pca9535_read_input);
+
+void pca9535_write_output(u16 param)
+{
+ pca9535_write_reg(pca9535_i2c_client, 2, param);
+}
+EXPORT_SYMBOL(pca9535_write_output);
+
+void pca9535_set_dir(u16 param)
+{
+ pca9535_write_reg(pca9535_i2c_client, 6, param);
+}
+EXPORT_SYMBOL(pca9535_set_dir);
+
+static int pca9535_attach_adapter(struct i2c_adapter *adapter)
+{
+ return i2c_probe(adapter, &addr_data, pca9535_attach);
+}
+
+static int pca9535_attach(struct i2c_adapter *adapter, int address, int zero_or_minus_one)
+{
+ struct i2c_client *new_client;
+ int err = 0;
+
+ new_client = &(pca9535_inited.client);
+ i2c_set_clientdata(new_client, 0);
+ new_client->addr = address;
+ new_client->adapter = adapter;
+ new_client->driver = &pca9535_driver;
+ strcpy(new_client->name, DRIVER_NAME);
+
+ if ((err = i2c_attach_client(new_client)))
+ goto exit_free;
+
+ pca9535_i2c_client = new_client;
+
+ init_MUTEX(&pca9535_inited.lock);
+ i2c_set_clientdata(pca9535_i2c_client, &pca9535_inited);
+
+ sysfs_create_group(&pca9535_i2c_client->dev.kobj, &pca9535_defattr_group);
+
+ printk("pca9535_attach() ok, address = %d, zero_or_minus_one = %d\n", address, zero_or_minus_one);
+ return 0;
+
+exit_free:
+ printk("pca9535_attach() failed, error code = %d\n", err);
+ return err;
+}
+
+static int pca9535_detach_client(struct i2c_client *client)
+{
+ int err;
+
+ if ((err = i2c_detach_client(client))) {
+ dev_err(&client->dev, "Client deregistration failed, client not detached.\n");
+ return err;
+ }
+ pca9535_i2c_client = NULL;
+
+ return 0;
+}
+
+static int __init pca9535_init(void)
+{
+ return i2c_add_driver(&pca9535_driver);
+}
+
+static void __exit pca9535_exit(void)
+{
+ i2c_del_driver(&pca9535_driver);
+}
+
+/*
+ * Reads the value of GPIO available via I2C.
+ */
+int pca9535_gpio_read(int gpio){
+ unsigned char reg = 0;
+ unsigned long val = 0;
+
+ printk("9535_gpio_read() called\n");
+ if(!pca9535_i2c_client)
+ return -ENODEV;
+
+ if(gpio < GPIO0 || gpio > GPIO17)
+ return -EINVAL;
+
+ if(gpio >= GPIO0 && gpio <= GPIO7){
+ reg = PCA9535_INPUT_0;
+ gpio -= GPIO0;
+ }else if(gpio >= GPIO8 && gpio <= GPIO17){
+ reg = PCA9535_INPUT_1;
+ gpio -= GPIO8;
+ }
+
+ down(&pca9535_inited.lock);
+
+ // Read the existing values first
+ val = pca9535_read_reg(pca9535_i2c_client, reg) >> 8;
+ val = (val >> gpio) & 0x01;
+
+ up(&pca9535_inited.lock);
+
+ return val;
+}
+
+/*
+ * Set the value of I2C GPIO.
+ */
+int pca9535_gpio_write(int gpio, unsigned char value){
+ unsigned char in_reg = 0;
+ unsigned char out_reg = 0;
+ unsigned long val = 0;
+ unsigned long old = 0;
+ int ret = 0;
+
+ if(!pca9535_i2c_client)
+ return -ENODEV;
+
+ if(gpio < GPIO0 || gpio > GPIO17)
+ return -EINVAL;
+
+ if(gpio >= GPIO0 && gpio <= GPIO7){
+ in_reg = PCA9535_INPUT_0;
+ out_reg = PCA9535_OUTPUT_0;
+ gpio -= GPIO0;
+ }else if(gpio >= GPIO8 && gpio <= GPIO17){
+ in_reg = PCA9535_INPUT_1;
+ out_reg = PCA9535_OUTPUT_1;
+ gpio -= GPIO8;
+ }
+
+ down(&pca9535_inited.lock);
+
+ // Read the existing values first
+ val = pca9535_read_reg(pca9535_i2c_client, in_reg);
+ old = val >> 8;
+
+ switch(value){
+ case LOW:
+ old |= (1 << gpio);
+ break;
+ case HI:
+ old &= ~(1 << gpio);
+ break;
+ default:
+ ret = -EINVAL;
+ goto error;
+ }
+
+ val = (val & 0xff) | (old << 8);
+
+ // write the values back to the register
+ pca9535_write_reg(pca9535_i2c_client, out_reg, val);
+error:
+
+ up(&pca9535_inited.lock);
+ return ret;
+}
+
+/*
+ * Set the direction of I2C GPIO.
+ */
+int pca9535_gpio_direction(int gpio, unsigned char direction){
+ unsigned char reg = 0;
+ unsigned long val = 0;
+ unsigned long old = 0;
+ int ret = 0;
+
+ if(!pca9535_i2c_client)
+ return -ENODEV;
+
+ if(gpio < GPIO0 || gpio > GPIO17)
+ return -EINVAL;
+
+ if(gpio >= GPIO0 && gpio <= GPIO7){
+ reg = PCA9535_DIRECTION_0;
+ gpio -= GPIO0;
+ }else if(gpio >= GPIO8 && gpio <= GPIO17){
+ reg = PCA9535_DIRECTION_1;
+ gpio -= GPIO8;
+ }
+
+ down(&pca9535_inited.lock);
+
+ // Read the existing values first
+ old = pca9535_read_reg(pca9535_i2c_client, reg);
+ val = old >> 8;
+
+ switch(direction){
+ case GPIO_INPUT:
+ val |= (1 << gpio);
+ break;
+ case GPIO_OUTPUT:
+ val &= ~(1 << gpio);
+ break;
+ default:
+ ret = -EINVAL;
+ goto error;
+ }
+
+ val = (old & 0xff) | (val << 8);
+
+ // write the values back to the register
+ pca9535_write_reg(pca9535_i2c_client, reg, val);
+error:
+
+ up(&pca9535_inited.lock);
+ return ret;
+}
+
+static u32 pca9535_read_reg(struct i2c_client *client, u8 regaddr)
+{
+ char buffer[3];
+ int r;
+ u32 data;
+
+ buffer[0] = regaddr;
+ buffer[1] = 0;
+ buffer[2] = 0;
+
+ r = i2c_master_send(client, buffer, 1);
+ if (r != 1) {
+ printk(KERN_ERR "pca9535: read failed, status %d\n", r);
+ return 0xffffffff;
+ }
+
+ r = i2c_master_recv(client, buffer, 3);
+ if (r != 3) {
+ printk(KERN_ERR "pca9535: read failed, status %d\n", r);
+ return 0xffffffff;
+ }
+
+ data = buffer[1];
+ data |= buffer[2] << 8;
+ //printk(KERN_ERR "%s: reading %x in %x\n", __FUNCTION__, data, regaddr);
+
+ return data;
+}
+
+static void pca9535_write_reg(struct i2c_client *client, u8 regaddr, u16 data)
+{
+ char buffer[3];
+ int r;
+
+ //printk(KERN_ERR "%s: writing %x in %x\n", __FUNCTION__, data, regaddr);
+ buffer[0] = regaddr;
+ buffer[1] = data >> 8;
+ buffer[2] = data & 0xff;
+
+ r = i2c_master_send(client, buffer, 3);
+ if (r != 3) {
+ printk(KERN_ERR "pca9535: write failed, status %d\n", r);
+ }
+}
+
+MODULE_AUTHOR("Husam Senussi <husamsenussi@gmail.com>");
+MODULE_DESCRIPTION("PCA9535 driver");
+MODULE_LICENSE("GPL");
+
+module_init(pca9535_init);
+module_exit(pca9535_exit);
projects / linux-2.6-omap-h63xx.git / commitdiff