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Diffstat (limited to 'drivers/i2c/busses/i2c-ixp4xx.c')
-rw-r--r--drivers/i2c/busses/i2c-ixp4xx.c178
1 files changed, 0 insertions, 178 deletions
diff --git a/drivers/i2c/busses/i2c-ixp4xx.c b/drivers/i2c/busses/i2c-ixp4xx.c
deleted file mode 100644
index 069ed7f3b395..000000000000
--- a/drivers/i2c/busses/i2c-ixp4xx.c
+++ /dev/null
@@ -1,178 +0,0 @@
1/*
2 * drivers/i2c/busses/i2c-ixp4xx.c
3 *
4 * Intel's IXP4xx XScale NPU chipsets (IXP420, 421, 422, 425) do not have
5 * an on board I2C controller but provide 16 GPIO pins that are often
6 * used to create an I2C bus. This driver provides an i2c_adapter
7 * interface that plugs in under algo_bit and drives the GPIO pins
8 * as instructed by the alogorithm driver.
9 *
10 * Author: Deepak Saxena <dsaxena@plexity.net>
11 *
12 * Copyright (c) 2003-2004 MontaVista Software Inc.
13 *
14 * This file is licensed under the terms of the GNU General Public
15 * License version 2. This program is licensed "as is" without any
16 * warranty of any kind, whether express or implied.
17 *
18 * NOTE: Since different platforms will use different GPIO pins for
19 * I2C, this driver uses an IXP4xx-specific platform_data
20 * pointer to pass the GPIO numbers to the driver. This
21 * allows us to support all the different IXP4xx platforms
22 * w/o having to put #ifdefs in this driver.
23 *
24 * See arch/arm/mach-ixp4xx/ixdp425.c for an example of building a
25 * device list and filling in the ixp4xx_i2c_pins data structure
26 * that is passed as the platform_data to this driver.
27 */
28
29#include <linux/kernel.h>
30#include <linux/init.h>
31#include <linux/platform_device.h>
32#include <linux/module.h>
33#include <linux/i2c.h>
34#include <linux/i2c-algo-bit.h>
35
36#include <asm/hardware.h> /* Pick up IXP4xx-specific bits */
37
38static inline int ixp4xx_scl_pin(void *data)
39{
40 return ((struct ixp4xx_i2c_pins*)data)->scl_pin;
41}
42
43static inline int ixp4xx_sda_pin(void *data)
44{
45 return ((struct ixp4xx_i2c_pins*)data)->sda_pin;
46}
47
48static void ixp4xx_bit_setscl(void *data, int val)
49{
50 gpio_line_set(ixp4xx_scl_pin(data), 0);
51 gpio_line_config(ixp4xx_scl_pin(data),
52 val ? IXP4XX_GPIO_IN : IXP4XX_GPIO_OUT );
53}
54
55static void ixp4xx_bit_setsda(void *data, int val)
56{
57 gpio_line_set(ixp4xx_sda_pin(data), 0);
58 gpio_line_config(ixp4xx_sda_pin(data),
59 val ? IXP4XX_GPIO_IN : IXP4XX_GPIO_OUT );
60}
61
62static int ixp4xx_bit_getscl(void *data)
63{
64 int scl;
65
66 gpio_line_config(ixp4xx_scl_pin(data), IXP4XX_GPIO_IN );
67 gpio_line_get(ixp4xx_scl_pin(data), &scl);
68
69 return scl;
70}
71
72static int ixp4xx_bit_getsda(void *data)
73{
74 int sda;
75
76 gpio_line_config(ixp4xx_sda_pin(data), IXP4XX_GPIO_IN );
77 gpio_line_get(ixp4xx_sda_pin(data), &sda);
78
79 return sda;
80}
81
82struct ixp4xx_i2c_data {
83 struct ixp4xx_i2c_pins *gpio_pins;
84 struct i2c_adapter adapter;
85 struct i2c_algo_bit_data algo_data;
86};
87
88static int ixp4xx_i2c_remove(struct platform_device *plat_dev)
89{
90 struct ixp4xx_i2c_data *drv_data = platform_get_drvdata(plat_dev);
91
92 platform_set_drvdata(plat_dev, NULL);
93
94 i2c_del_adapter(&drv_data->adapter);
95
96 kfree(drv_data);
97
98 return 0;
99}
100
101static int ixp4xx_i2c_probe(struct platform_device *plat_dev)
102{
103 int err;
104 struct ixp4xx_i2c_pins *gpio = plat_dev->dev.platform_data;
105 struct ixp4xx_i2c_data *drv_data =
106 kzalloc(sizeof(struct ixp4xx_i2c_data), GFP_KERNEL);
107
108 if(!drv_data)
109 return -ENOMEM;
110
111 drv_data->gpio_pins = gpio;
112
113 /*
114 * We could make a lot of these structures static, but
115 * certain platforms may have multiple GPIO-based I2C
116 * buses for various device domains, so we need per-device
117 * algo_data->data.
118 */
119 drv_data->algo_data.data = gpio;
120 drv_data->algo_data.setsda = ixp4xx_bit_setsda;
121 drv_data->algo_data.setscl = ixp4xx_bit_setscl;
122 drv_data->algo_data.getsda = ixp4xx_bit_getsda;
123 drv_data->algo_data.getscl = ixp4xx_bit_getscl;
124 drv_data->algo_data.udelay = 10;
125 drv_data->algo_data.timeout = 100;
126
127 drv_data->adapter.id = I2C_HW_B_IXP4XX;
128 drv_data->adapter.class = I2C_CLASS_HWMON;
129 strlcpy(drv_data->adapter.name, plat_dev->dev.driver->name,
130 sizeof(drv_data->adapter.name));
131 drv_data->adapter.algo_data = &drv_data->algo_data;
132
133 drv_data->adapter.dev.parent = &plat_dev->dev;
134
135 gpio_line_config(gpio->scl_pin, IXP4XX_GPIO_IN);
136 gpio_line_config(gpio->sda_pin, IXP4XX_GPIO_IN);
137 gpio_line_set(gpio->scl_pin, 0);
138 gpio_line_set(gpio->sda_pin, 0);
139
140 err = i2c_bit_add_bus(&drv_data->adapter);
141 if (err) {
142 printk(KERN_ERR "ERROR: Could not install %s\n", plat_dev->dev.bus_id);
143
144 kfree(drv_data);
145 return err;
146 }
147
148 platform_set_drvdata(plat_dev, drv_data);
149
150 return 0;
151}
152
153static struct platform_driver ixp4xx_i2c_driver = {
154 .probe = ixp4xx_i2c_probe,
155 .remove = ixp4xx_i2c_remove,
156 .driver = {
157 .name = "IXP4XX-I2C",
158 .owner = THIS_MODULE,
159 },
160};
161
162static int __init ixp4xx_i2c_init(void)
163{
164 return platform_driver_register(&ixp4xx_i2c_driver);
165}
166
167static void __exit ixp4xx_i2c_exit(void)
168{
169 platform_driver_unregister(&ixp4xx_i2c_driver);
170}
171
172module_init(ixp4xx_i2c_init);
173module_exit(ixp4xx_i2c_exit);
174
175MODULE_DESCRIPTION("GPIO-based I2C adapter for IXP4xx systems");
176MODULE_LICENSE("GPL");
177MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
178
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-23 07:34:49 -0500