1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* Core driver for HTC PASIC3 LED/DS1WM chip.
*
* Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com>
*
* 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; version 2 of the License.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/mfd/ds1wm.h>
#include <linux/mfd/htc-pasic3.h>
struct pasic3_data {
void __iomem *mapping;
unsigned int bus_shift;
};
#define REG_ADDR 5
#define REG_DATA 6
#define READ_MODE 0x80
/*
* write to a secondary register on the PASIC3
*/
void pasic3_write_register(struct device *dev, u32 reg, u8 val)
{
struct pasic3_data *asic = dev->driver_data;
int bus_shift = asic->bus_shift;
void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
__raw_writeb(~READ_MODE & reg, addr);
__raw_writeb(val, data);
}
EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
/*
* read from a secondary register on the PASIC3
*/
u8 pasic3_read_register(struct device *dev, u32 reg)
{
struct pasic3_data *asic = dev->driver_data;
int bus_shift = asic->bus_shift;
void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
__raw_writeb(READ_MODE | reg, addr);
return __raw_readb(data);
}
EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
/*
* LEDs
*/
static struct mfd_cell led_cell __initdata = {
.name = "leds-pasic3",
};
/*
* DS1WM
*/
static int ds1wm_enable(struct platform_device *pdev)
{
struct device *dev = pdev->dev.parent;
int c;
c = pasic3_read_register(dev, 0x28);
pasic3_write_register(dev, 0x28, c & 0x7f);
dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
return 0;
}
static int ds1wm_disable(struct platform_device *pdev)
{
struct device *dev = pdev->dev.parent;
int c;
c = pasic3_read_register(dev, 0x28);
pasic3_write_register(dev, 0x28, c | 0x80);
dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
return 0;
}
static struct ds1wm_driver_data ds1wm_pdata = {
.active_high = 0,
};
static struct resource ds1wm_resources[] __initdata = {
[0] = {
.start = 0,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = 0,
.end = 0,
.flags = IORESOURCE_IRQ,
},
};
static struct mfd_cell ds1wm_cell __initdata = {
.name = "ds1wm",
.enable = ds1wm_enable,
.disable = ds1wm_disable,
.driver_data = &ds1wm_pdata,
.num_resources = 2,
.resources = ds1wm_resources,
};
static int __init pasic3_probe(struct platform_device *pdev)
{
struct pasic3_platform_data *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct pasic3_data *asic;
struct resource *r;
int ret;
int irq = 0;
r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (r) {
ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
(IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
irq = r->start;
}
r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (r) {
ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
(IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
irq = r->start;
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -ENXIO;
if (!request_mem_region(r->start, resource_size(r), "pasic3"))
return -EBUSY;
asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
if (!asic)
return -ENOMEM;
platform_set_drvdata(pdev, asic);
asic->mapping = ioremap(r->start, resource_size(r));
if (!asic->mapping) {
dev_err(dev, "couldn't ioremap PASIC3\n");
kfree(asic);
return -ENOMEM;
}
/* calculate bus shift from mem resource */
asic->bus_shift = (resource_size(r) - 5) >> 3;
if (pdata && pdata->clock_rate) {
ds1wm_pdata.clock_rate = pdata->clock_rate;
/* the first 5 PASIC3 registers control the DS1WM */
ds1wm_resources[0].end = (5 << asic->bus_shift) - 1;
ds1wm_cell.platform_data = &ds1wm_cell;
ds1wm_cell.data_size = sizeof(ds1wm_cell);
ret = mfd_add_devices(&pdev->dev, pdev->id,
&ds1wm_cell, 1, r, irq);
if (ret < 0)
dev_warn(dev, "failed to register DS1WM\n");
}
if (pdata && pdata->led_pdata) {
led_cell.driver_data = pdata->led_pdata;
led_cell.platform_data = &led_cell;
led_cell.data_size = sizeof(ds1wm_cell);
ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, 0);
if (ret < 0)
dev_warn(dev, "failed to register LED device\n");
}
return 0;
}
static int pasic3_remove(struct platform_device *pdev)
{
struct pasic3_data *asic = platform_get_drvdata(pdev);
struct resource *r;
mfd_remove_devices(&pdev->dev);
iounmap(asic->mapping);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(r->start, resource_size(r));
kfree(asic);
return 0;
}
MODULE_ALIAS("platform:pasic3");
static struct platform_driver pasic3_driver = {
.driver = {
.name = "pasic3",
},
.remove = pasic3_remove,
};
static int __init pasic3_base_init(void)
{
return platform_driver_probe(&pasic3_driver, pasic3_probe);
}
static void __exit pasic3_base_exit(void)
{
platform_driver_unregister(&pasic3_driver);
}
module_init(pasic3_base_init);
module_exit(pasic3_base_exit);
MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
MODULE_DESCRIPTION("Core driver for HTC PASIC3");
MODULE_LICENSE("GPL");
|
