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authorWolfram Sang <w.sang@pengutronix.de>2009-09-18 16:45:48 -0400
committerJean Delvare <khali@linux-fr.org>2009-09-18 16:45:48 -0400
commit8f67eeb0b44cde19216955975ffef8513a87c0c0 (patch)
treec848851a7494b72038f24beca93362755567e8cc
parent4ba2ccb83e03077bb94f8848ee573f1e27cea969 (diff)
i2c/chips: Remove deprecated pcf8575 driver
The pcf8575 driver in drivers/i2c/chips which just exports its register to sysfs is superseded by drivers/gpio/pcf857x.c which properly uses the gpiolib. As this driver has been deprecated for more than a year, finally remove it. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Cc: Bart Van Assche <bart.vanassche@gmail.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat
-rw-r--r--Documentation/i2c/chips/pcf857569
-rw-r--r--drivers/i2c/chips/Kconfig18
-rw-r--r--drivers/i2c/chips/Makefile1
-rw-r--r--drivers/i2c/chips/pcf8575.c198
4 files changed, 0 insertions, 286 deletions
diff --git a/Documentation/i2c/chips/pcf8575 b/Documentation/i2c/chips/pcf8575
deleted file mode 100644
index 40b268eb276..00000000000
--- a/Documentation/i2c/chips/pcf8575
+++ /dev/null
@@ -1,69 +0,0 @@
1About the PCF8575 chip and the pcf8575 kernel driver
2====================================================
3
4The PCF8575 chip is produced by the following manufacturers:
5
6 * Philips NXP
7 http://www.nxp.com/#/pip/cb=[type=product,path=50807/41735/41850,final=PCF8575_3]|pip=[pip=PCF8575_3][0]
8
9 * Texas Instruments
10 http://focus.ti.com/docs/prod/folders/print/pcf8575.html
11
12
13Some vendors sell small PCB's with the PCF8575 mounted on it. You can connect
14such a board to a Linux host via e.g. an USB to I2C interface. Examples of
15PCB boards with a PCF8575:
16
17 * SFE Breakout Board for PCF8575 I2C Expander by RobotShop
18 http://www.robotshop.ca/home/products/robot-parts/electronics/adapters-converters/sfe-pcf8575-i2c-expander-board.html
19
20 * Breakout Board for PCF8575 I2C Expander by Spark Fun Electronics
21 http://www.sparkfun.com/commerce/product_info.php?products_id=8130
22
23
24Description
25-----------
26The PCF8575 chip is a 16-bit I/O expander for the I2C bus. Up to eight of
27these chips can be connected to the same I2C bus. You can find this
28chip on some custom designed hardware, but you won't find it on PC
29motherboards.
30
31The PCF8575 chip consists of a 16-bit quasi-bidirectional port and an I2C-bus
32interface. Each of the sixteen I/O's can be independently used as an input or
33an output. To set up an I/O pin as an input, you have to write a 1 to the
34corresponding output.
35
36For more information please see the datasheet.
37
38
39Detection
40---------
41
42There is no method known to detect whether a chip on a given I2C address is
43a PCF8575 or whether it is any other I2C device, so you have to pass the I2C
44bus and address of the installed PCF8575 devices explicitly to the driver at
45load time via the force=... parameter.
46
47/sys interface
48--------------
49
50For each address on which a PCF8575 chip was found or forced the following
51files will be created under /sys:
52* /sys/bus/i2c/devices/<bus>-<address>/read
53* /sys/bus/i2c/devices/<bus>-<address>/write
54where bus is the I2C bus number (0, 1, ...) and address is the four-digit
55hexadecimal representation of the 7-bit I2C address of the PCF8575
56(0020 .. 0027).
57
58The read file is read-only. Reading it will trigger an I2C read and will hence
59report the current input state for the pins configured as inputs, and the
60current output value for the pins configured as outputs.
61
62The write file is read-write. Writing a value to it will configure all pins
63as output for which the corresponding bit is zero. Reading the write file will
64return the value last written, or -EAGAIN if no value has yet been written to
65the write file.
66
67On module initialization the configuration of the chip is not changed -- the
68chip is left in the state it was already configured in through either power-up
69or through previous I2C write actions.
diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig
index 02d746c9c47..1b5455ec290 100644
--- a/drivers/i2c/chips/Kconfig
+++ b/drivers/i2c/chips/Kconfig
@@ -33,24 +33,6 @@ config SENSORS_PCF8574
33 These devices are hard to detect and rarely found on mainstream 33 These devices are hard to detect and rarely found on mainstream
34 hardware. If unsure, say N. 34 hardware. If unsure, say N.
35 35
36config PCF8575
37 tristate "Philips PCF8575 (DEPRECATED)"
38 default n
39 depends on GPIO_PCF857X = "n"
40 help
41 If you say yes here you get support for Philips PCF8575 chip.
42 This chip is a 16-bit I/O expander for the I2C bus. Several other
43 chip manufacturers sell equivalent chips, e.g. Texas Instruments.
44
45 This driver can also be built as a module. If so, the module
46 will be called pcf8575.
47
48 This driver is deprecated and will be dropped soon. Use
49 drivers/gpio/pcf857x.c instead.
50
51 This device is hard to detect and is rarely found on mainstream
52 hardware. If unsure, say N.
53
54config SENSORS_PCA9539 36config SENSORS_PCA9539
55 tristate "Philips PCA9539 16-bit I/O port (DEPRECATED)" 37 tristate "Philips PCA9539 16-bit I/O port (DEPRECATED)"
56 depends on EXPERIMENTAL && GPIO_PCA953X = "n" 38 depends on EXPERIMENTAL && GPIO_PCA953X = "n"
diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile
index f4680d16ee3..fceb377f528 100644
--- a/drivers/i2c/chips/Makefile
+++ b/drivers/i2c/chips/Makefile
@@ -13,7 +13,6 @@
13obj-$(CONFIG_DS1682) += ds1682.o 13obj-$(CONFIG_DS1682) += ds1682.o
14obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o 14obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o
15obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o 15obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o
16obj-$(CONFIG_PCF8575) += pcf8575.o
17obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o 16obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
18 17
19ifeq ($(CONFIG_I2C_DEBUG_CHIP),y) 18ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
diff --git a/drivers/i2c/chips/pcf8575.c b/drivers/i2c/chips/pcf8575.c
deleted file mode 100644
index 07fd7cb3c57..00000000000
--- a/drivers/i2c/chips/pcf8575.c
+++ /dev/null
@@ -1,198 +0,0 @@
1/*
2 pcf8575.c
3
4 About the PCF8575 chip: the PCF8575 is a 16-bit I/O expander for the I2C bus
5 produced by a.o. Philips Semiconductors.
6
7 Copyright (C) 2006 Michael Hennerich, Analog Devices Inc.
8 <hennerich@blackfin.uclinux.org>
9 Based on pcf8574.c.
10
11 Copyright (c) 2007 Bart Van Assche <bart.vanassche@gmail.com>.
12 Ported this driver from ucLinux to the mainstream Linux kernel.
13
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 2 of the License, or
17 (at your option) any later version.
18
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
23
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27*/
28
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/i2c.h>
32#include <linux/slab.h> /* kzalloc() */
33#include <linux/sysfs.h> /* sysfs_create_group() */
34
35/* Addresses to scan: none, device can't be detected */
36static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
37
38/* Insmod parameters */
39I2C_CLIENT_INSMOD;
40
41
42/* Each client has this additional data */
43struct pcf8575_data {
44 int write; /* last written value, or error code */
45};
46
47/* following are the sysfs callback functions */
48static ssize_t show_read(struct device *dev, struct device_attribute *attr,
49 char *buf)
50{
51 struct i2c_client *client = to_i2c_client(dev);
52 u16 val;
53 u8 iopin_state[2];
54
55 i2c_master_recv(client, iopin_state, 2);
56
57 val = iopin_state[0];
58 val |= iopin_state[1] << 8;
59
60 return sprintf(buf, "%u\n", val);
61}
62
63static DEVICE_ATTR(read, S_IRUGO, show_read, NULL);
64
65static ssize_t show_write(struct device *dev, struct device_attribute *attr,
66 char *buf)
67{
68 struct pcf8575_data *data = dev_get_drvdata(dev);
69 if (data->write < 0)
70 return data->write;
71 return sprintf(buf, "%d\n", data->write);
72}
73
74static ssize_t set_write(struct device *dev, struct device_attribute *attr,
75 const char *buf, size_t count)
76{
77 struct i2c_client *client = to_i2c_client(dev);
78 struct pcf8575_data *data = i2c_get_clientdata(client);
79 unsigned long val = simple_strtoul(buf, NULL, 10);
80 u8 iopin_state[2];
81
82 if (val > 0xffff)
83 return -EINVAL;
84
85 data->write = val;
86
87 iopin_state[0] = val & 0xFF;
88 iopin_state[1] = val >> 8;
89
90 i2c_master_send(client, iopin_state, 2);
91
92 return count;
93}
94
95static DEVICE_ATTR(write, S_IWUSR | S_IRUGO, show_write, set_write);
96
97static struct attribute *pcf8575_attributes[] = {
98 &dev_attr_read.attr,
99 &dev_attr_write.attr,
100 NULL
101};
102
103static const struct attribute_group pcf8575_attr_group = {
104 .attrs = pcf8575_attributes,
105};
106
107/*
108 * Real code
109 */
110
111/* Return 0 if detection is successful, -ENODEV otherwise */
112static int pcf8575_detect(struct i2c_client *client, int kind,
113 struct i2c_board_info *info)
114{
115 struct i2c_adapter *adapter = client->adapter;
116
117 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
118 return -ENODEV;
119
120 /* This is the place to detect whether the chip at the specified
121 address really is a PCF8575 chip. However, there is no method known
122 to detect whether an I2C chip is a PCF8575 or any other I2C chip. */
123
124 strlcpy(info->type, "pcf8575", I2C_NAME_SIZE);
125
126 return 0;
127}
128
129static int pcf8575_probe(struct i2c_client *client,
130 const struct i2c_device_id *id)
131{
132 struct pcf8575_data *data;
133 int err;
134
135 data = kzalloc(sizeof(struct pcf8575_data), GFP_KERNEL);
136 if (!data) {
137 err = -ENOMEM;
138 goto exit;
139 }
140
141 i2c_set_clientdata(client, data);
142 data->write = -EAGAIN;
143
144 /* Register sysfs hooks */
145 err = sysfs_create_group(&client->dev.kobj, &pcf8575_attr_group);
146 if (err)
147 goto exit_free;
148
149 return 0;
150
151exit_free:
152 kfree(data);
153exit:
154 return err;
155}
156
157static int pcf8575_remove(struct i2c_client *client)
158{
159 sysfs_remove_group(&client->dev.kobj, &pcf8575_attr_group);
160 kfree(i2c_get_clientdata(client));
161 return 0;
162}
163
164static const struct i2c_device_id pcf8575_id[] = {
165 { "pcf8575", 0 },
166 { }
167};
168
169static struct i2c_driver pcf8575_driver = {
170 .driver = {
171 .owner = THIS_MODULE,
172 .name = "pcf8575",
173 },
174 .probe = pcf8575_probe,
175 .remove = pcf8575_remove,
176 .id_table = pcf8575_id,
177
178 .detect = pcf8575_detect,
179 .address_data = &addr_data,
180};
181
182static int __init pcf8575_init(void)
183{
184 return i2c_add_driver(&pcf8575_driver);
185}
186
187static void __exit pcf8575_exit(void)
188{
189 i2c_del_driver(&pcf8575_driver);
190}
191
192MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>, "
193 "Bart Van Assche <bart.vanassche@gmail.com>");
194MODULE_DESCRIPTION("pcf8575 driver");
195MODULE_LICENSE("GPL");
196
197module_init(pcf8575_init);
198module_exit(pcf8575_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 21:31:37 -0500