Path: news.gmane.org!not-for-mail From: Guennadi Liakhovetski Newsgroups: gmane.comp.video.video4linux,gmane.linux.drivers.i2c Subject: [RFC PATCH 3/8] Philips PCA9536 4 bit I2C GPIO extender driver Date: Wed, 23 Jan 2008 18:41:39 +0100 (CET) Lines: 210 Approved: news@gmane.org Message-ID: References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Trace: ger.gmane.org 1201110131 28782 80.91.229.12 (23 Jan 2008 17:42:11 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 23 Jan 2008 17:42:11 +0000 (UTC) Cc: i2c@lm-sensors.org To: video4linux-list@redhat.com Original-X-From: video4linux-list-bounces@redhat.com Wed Jan 23 18:42:30 2008 Return-path: Envelope-to: rh-video4linux-list@gmane.org Original-Received: from hormel.redhat.com ([209.132.177.30]) by lo.gmane.org with esmtp (Exim 4.50) id 1JHjcK-0002zY-Jd for rh-video4linux-list@gmane.org; Wed, 23 Jan 2008 18:42:29 +0100 Original-Received: from listman.util.phx.redhat.com (listman.util.phx.redhat.com [10.8.4.110]) by hormel.redhat.com (Postfix) with ESMTP id 1D07D72F5C; Wed, 23 Jan 2008 12:42:02 -0500 (EST) Original-Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.52.254]) by listman.util.phx.redhat.com (8.13.1/8.13.1) with ESMTP id m0NHfx7t017217 for ; Wed, 23 Jan 2008 12:41:59 -0500 Original-Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id m0NHfxW4028112 for ; Wed, 23 Jan 2008 12:41:59 -0500 Original-Received: from mail.gmx.net (mail.gmx.net [213.165.64.20]) by mx3.redhat.com (8.13.1/8.13.1) with SMTP id m0NHfPdF000786 for ; Wed, 23 Jan 2008 12:41:25 -0500 Original-Received: (qmail invoked by alias); 23 Jan 2008 17:41:19 -0000 Original-Received: from p57BD2F1F.dip0.t-ipconnect.de (EHLO axis700.grange) [87.189.47.31] by mail.gmx.net (mp021) with SMTP; 23 Jan 2008 18:41:19 +0100 X-Authenticated: #20450766 X-Provags-ID: V01U2FsdGVkX18gZ14xakQgr3grhg4ys0olRWzKeUW5G+x4WUV9jY iLvi2phxgtwjvM Original-Received: from lyakh (helo=localhost) by axis700.grange with local-esmtp (Exim 4.63) (envelope-from ) id 1JHjbX-00029t-5A; Wed, 23 Jan 2008 18:41:39 +0100 X-X-Sender: lyakh@axis700.grange In-Reply-To: X-Y-GMX-Trusted: 0 X-RedHat-Spam-Score: 0 X-Scanned-By: MIMEDefang 2.58 on 172.16.52.254 X-Scanned-By: MIMEDefang 2.58 on 172.16.48.32 X-loop: video4linux-list@redhat.com X-BeenThere: video4linux-list@redhat.com X-Mailman-Version: 2.1.5 Precedence: junk List-Id: Linux and Kernel Video List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: video4linux-list-bounces@redhat.com Errors-To: video4linux-list-bounces@redhat.com Xref: news.gmane.org gmane.comp.video.video4linux:36471 gmane.linux.drivers.i2c:251 Archived-At: This driver will be used by the mt9m001 and the mt9v022 camera drivers, that can use a pca9536 to switch between 8 and 10 bit modes. Signed-off-by: Guennadi Liakhovetski --- drivers/i2c/chips/Kconfig | 10 +++ drivers/i2c/chips/Makefile | 1 + drivers/i2c/chips/pca9536.c | 153 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 164 insertions(+), 0 deletions(-) create mode 100644 drivers/i2c/chips/pca9536.c diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index 2e1c24f..6f492f1 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -65,6 +65,16 @@ config SENSORS_PCF8574 These devices are hard to detect and rarely found on mainstream hardware. If unsure, say N. +config SENSORS_PCA9536 + tristate "Philips PCA9536 4-bit I/O port" + depends on EXPERIMENTAL + help + If you say yes here you get support for the Philips PCA9539 + 4-bit I/O port. + + This driver can also be built as a module. If so, the module + will be called pca9536. + config SENSORS_PCA9539 tristate "Philips PCA9539 16-bit I/O port" depends on EXPERIMENTAL diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index ca924e1..e24c582 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_DS1682) += ds1682.o obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o obj-$(CONFIG_SENSORS_MAX6875) += max6875.o obj-$(CONFIG_SENSORS_M41T00) += m41t00.o +obj-$(CONFIG_SENSORS_PCA9536) += pca9536.o obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o diff --git a/drivers/i2c/chips/pca9536.c b/drivers/i2c/chips/pca9536.c new file mode 100644 index 0000000..08e5d8b --- /dev/null +++ b/drivers/i2c/chips/pca9536.c @@ -0,0 +1,152 @@ +/* + * Driver for PCA9536 I/O Expander + * + * Copyright (C) 2008, Guennadi Liakhovetski + * + * 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 +#include +#include +#include + +#include +#include + +#define PCA9536_INPUT 0 +#define PCA9536_OUTPUT 1 +#define PCA9536_INVERT 2 +#define PCA9536_DIRECTION 3 + +/* following are the sysfs callback functions */ +static ssize_t pca9536_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, "%d\n", i2c_smbus_read_byte_data(client, + psa->index)); +} + +static ssize_t pca9536_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); + + if (val > 0xff) + return -EINVAL; + + i2c_smbus_write_byte_data(client, psa->index, val); + return count; +} + +int pca9536_set_level(struct i2c_client *client, u8 pin, u8 level) +{ + s32 data; + + if (pin > 3) + return -EINVAL; + + /* Switch to output */ + data = i2c_smbus_read_byte_data(client, PCA9536_DIRECTION); + if (data < 0) + return data; + data = i2c_smbus_write_byte_data(client, PCA9536_DIRECTION, + data & ~(1 << pin)); + if (data < 0) + return data; + + /* Set level */ + data = i2c_smbus_read_byte_data(client, PCA9536_OUTPUT); + if (data < 0) + return data; + if (level) + data |= (1 << pin); + else + data &= ~(1 << pin); + data = i2c_smbus_write_byte_data(client, PCA9536_OUTPUT, data); + + return data; +} +EXPORT_SYMBOL(pca9536_set_level); + +/* Define the device attributes */ + +#define PCA9536_ENTRY_RO(name, reg) \ + static SENSOR_DEVICE_ATTR(name, S_IRUGO, pca9536_show, NULL, reg) + +#define PCA9536_ENTRY_RW(name, reg) \ + static SENSOR_DEVICE_ATTR(name, S_IRUGO | S_IWUSR, pca9536_show, \ + pca9536_store, reg) + +PCA9536_ENTRY_RO(input, PCA9536_INPUT); +PCA9536_ENTRY_RW(output, PCA9536_OUTPUT); +PCA9536_ENTRY_RW(invert, PCA9536_INVERT); +PCA9536_ENTRY_RW(direction, PCA9536_DIRECTION); + +static struct attribute *pca9536_attributes[] = { + &sensor_dev_attr_input.dev_attr.attr, + &sensor_dev_attr_output.dev_attr.attr, + &sensor_dev_attr_invert.dev_attr.attr, + &sensor_dev_attr_direction.dev_attr.attr, + NULL +}; + +static struct attribute_group pca9536_defattr_group = { + .attrs = pca9536_attributes, +}; + +static int pca9536_probe(struct i2c_client *client) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { + pr_debug("%s: I2C-Adapter doesn't support I2C_FUNC_SMBUS_BYTE\n", __FUNCTION__); + return -EIO; + } + + if (client->dev.platform_data) + /* This chip is going to be used from the kernel */ + *(struct i2c_client **)client->dev.platform_data = client; + + /* Register sysfs hooks */ + return sysfs_create_group(&client->dev.kobj, + &pca9536_defattr_group); +} + +static int pca9536_remove(struct i2c_client *client) +{ + sysfs_remove_group(&client->dev.kobj, &pca9536_defattr_group); + return 0; +} + +static struct i2c_driver pca9536_i2c_driver = { + .driver = { + .name = "pca9536", + }, + .probe = pca9536_probe, + .remove = pca9536_remove, +}; + +static int __init pca9536_mod_init(void) +{ + return i2c_add_driver(&pca9536_i2c_driver); +} + +static void __exit pca9536_mod_exit(void) +{ + i2c_del_driver(&pca9536_i2c_driver); +} + +module_init(pca9536_mod_init); +module_exit(pca9536_mod_exit); + +MODULE_DESCRIPTION("PCA9536 driver"); +MODULE_AUTHOR("Guennadi Liakhovetski "); +MODULE_LICENSE("GPL"); -- 1.5.3.4 -- video4linux-list mailing list Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list