tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Core driver for HTC PASIC3 LED/DS1WM chip.
3 *
4 * Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 */
10
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14
15#include <linux/ds1wm.h>
16#include <linux/gpio.h>
17#include <linux/io.h>
18#include <linux/irq.h>
19#include <linux/interrupt.h>
20#include <linux/mfd/htc-pasic3.h>
21
22struct pasic3_data {
23 void __iomem *mapping;
24 unsigned int bus_shift;
25 struct platform_device *ds1wm_pdev;
26 struct platform_device *led_pdev;
27};
28
29#define REG_ADDR 5
30#define REG_DATA 6
31
32#define READ_MODE 0x80
33
34/*
35 * write to a secondary register on the PASIC3
36 */
37void pasic3_write_register(struct device *dev, u32 reg, u8 val)
38{
39 struct pasic3_data *asic = dev->driver_data;
40 int bus_shift = asic->bus_shift;
41 void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
42 void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
43
44 __raw_writeb(~READ_MODE & reg, addr);
45 __raw_writeb(val, data);
46}
47EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
48
49/*
50 * read from a secondary register on the PASIC3
51 */
52u8 pasic3_read_register(struct device *dev, u32 reg)
53{
54 struct pasic3_data *asic = dev->driver_data;
55 int bus_shift = asic->bus_shift;
56 void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
57 void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
58
59 __raw_writeb(READ_MODE | reg, addr);
60 return __raw_readb(data);
61}
62EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
63
64/*
65 * LEDs
66 */
67
68static int led_device_add(struct device *pasic3_dev,
69 const struct pasic3_leds_machinfo *pdata)
70{
71 struct pasic3_data *asic = pasic3_dev->driver_data;
72 struct platform_device *pdev;
73 int ret;
74
75 pdev = platform_device_alloc("pasic3-led", -1);
76 if (!pdev) {
77 dev_dbg(pasic3_dev, "failed to allocate LED platform device\n");
78 return -ENOMEM;
79 }
80
81 ret = platform_device_add_data(pdev, pdata,
82 sizeof(struct pasic3_leds_machinfo));
83 if (ret < 0) {
84 dev_dbg(pasic3_dev, "failed to add LED platform data\n");
85 goto exit_pdev_put;
86 }
87
88 pdev->dev.parent = pasic3_dev;
89 ret = platform_device_add(pdev);
90 if (ret < 0) {
91 dev_dbg(pasic3_dev, "failed to add LED platform device\n");
92 goto exit_pdev_put;
93 }
94
95 asic->led_pdev = pdev;
96 return 0;
97
98exit_pdev_put:
99 platform_device_put(pdev);
100 return ret;
101}
102
103/*
104 * DS1WM
105 */
106
107static void ds1wm_enable(struct platform_device *pdev)
108{
109 struct device *dev = pdev->dev.parent;
110 int c;
111
112 c = pasic3_read_register(dev, 0x28);
113 pasic3_write_register(dev, 0x28, c & 0x7f);
114
115 dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
116}
117
118static void ds1wm_disable(struct platform_device *pdev)
119{
120 struct device *dev = pdev->dev.parent;
121 int c;
122
123 c = pasic3_read_register(dev, 0x28);
124 pasic3_write_register(dev, 0x28, c | 0x80);
125
126 dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
127}
128
129static struct ds1wm_platform_data ds1wm_pdata = {
130 .bus_shift = 2,
131 .enable = ds1wm_enable,
132 .disable = ds1wm_disable,
133};
134
135static int ds1wm_device_add(struct platform_device *pasic3_pdev, int bus_shift)
136{
137 struct device *pasic3_dev = &pasic3_pdev->dev;
138 struct pasic3_data *asic = pasic3_dev->driver_data;
139 struct platform_device *pdev;
140 int ret;
141
142 pdev = platform_device_alloc("ds1wm", -1);
143 if (!pdev) {
144 dev_dbg(pasic3_dev, "failed to allocate DS1WM platform device\n");
145 return -ENOMEM;
146 }
147
148 ret = platform_device_add_resources(pdev, pasic3_pdev->resource,
149 pasic3_pdev->num_resources);
150 if (ret < 0) {
151 dev_dbg(pasic3_dev, "failed to add DS1WM resources\n");
152 goto exit_pdev_put;
153 }
154
155 ds1wm_pdata.bus_shift = asic->bus_shift;
156 ret = platform_device_add_data(pdev, &ds1wm_pdata,
157 sizeof(struct ds1wm_platform_data));
158 if (ret < 0) {
159 dev_dbg(pasic3_dev, "failed to add DS1WM platform data\n");
160 goto exit_pdev_put;
161 }
162
163 pdev->dev.parent = pasic3_dev;
164 ret = platform_device_add(pdev);
165 if (ret < 0) {
166 dev_dbg(pasic3_dev, "failed to add DS1WM platform device\n");
167 goto exit_pdev_put;
168 }
169
170 asic->ds1wm_pdev = pdev;
171 return 0;
172
173exit_pdev_put:
174 platform_device_put(pdev);
175 return ret;
176}
177
178static int __init pasic3_probe(struct platform_device *pdev)
179{
180 struct pasic3_platform_data *pdata = pdev->dev.platform_data;
181 struct device *dev = &pdev->dev;
182 struct pasic3_data *asic;
183 struct resource *r;
184 int ret;
185
186 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
187 if (!r)
188 return -ENXIO;
189
190 if (!request_mem_region(r->start, r->end - r->start + 1, "pasic3"))
191 return -EBUSY;
192
193 asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
194 if (!asic)
195 return -ENOMEM;
196
197 platform_set_drvdata(pdev, asic);
198
199 if (pdata && pdata->bus_shift)
200 asic->bus_shift = pdata->bus_shift;
201 else
202 asic->bus_shift = 2;
203
204 asic->mapping = ioremap(r->start, r->end - r->start + 1);
205 if (!asic->mapping) {
206 dev_err(dev, "couldn't ioremap PASIC3\n");
207 kfree(asic);
208 return -ENOMEM;
209 }
210
211 ret = ds1wm_device_add(pdev, asic->bus_shift);
212 if (ret < 0)
213 dev_warn(dev, "failed to register DS1WM\n");
214
215 if (pdata->led_pdata) {
216 ret = led_device_add(dev, pdata->led_pdata);
217 if (ret < 0)
218 dev_warn(dev, "failed to register LED device\n");
219 }
220
221 return 0;
222}
223
224static int pasic3_remove(struct platform_device *pdev)
225{
226 struct pasic3_data *asic = platform_get_drvdata(pdev);
227 struct resource *r;
228
229 if (asic->led_pdev)
230 platform_device_unregister(asic->led_pdev);
231 if (asic->ds1wm_pdev)
232 platform_device_unregister(asic->ds1wm_pdev);
233
234 iounmap(asic->mapping);
235 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
236 release_mem_region(r->start, r->end - r->start + 1);
237 kfree(asic);
238 return 0;
239}
240
241static struct platform_driver pasic3_driver = {
242 .driver = {
243 .name = "pasic3",
244 },
245 .remove = pasic3_remove,
246};
247
248static int __init pasic3_base_init(void)
249{
250 return platform_driver_probe(&pasic3_driver, pasic3_probe);
251}
252
253static void __exit pasic3_base_exit(void)
254{
255 platform_driver_unregister(&pasic3_driver);
256}
257
258module_init(pasic3_base_init);
259module_exit(pasic3_base_exit);
260
261MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
262MODULE_DESCRIPTION("Core driver for HTC PASIC3");
263MODULE_LICENSE("GPL");