Merge branches 'pxa' and 'orion-fixes1'
[linux-2.6.git] / drivers / mfd / htc-pasic3.c
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
22 struct 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  */
37 void 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 }
47 EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
48
49 /*
50  * read from a secondary register on the PASIC3
51  */
52 u8 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 }
62 EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
63
64 /*
65  * LEDs
66  */
67
68 static 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
98 exit_pdev_put:
99         platform_device_put(pdev);
100         return ret;
101 }
102
103 /*
104  * DS1WM
105  */
106
107 static 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
118 static 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
129 static struct ds1wm_platform_data ds1wm_pdata = {
130         .bus_shift = 2,
131         .enable    = ds1wm_enable,
132         .disable   = ds1wm_disable,
133 };
134
135 static 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
173 exit_pdev_put:
174         platform_device_put(pdev);
175         return ret;
176 }
177
178 static 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
224 static 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
241 static struct platform_driver pasic3_driver = {
242         .driver         = {
243                 .name   = "pasic3",
244         },
245         .remove         = pasic3_remove,
246 };
247
248 static int __init pasic3_base_init(void)
249 {
250         return platform_driver_probe(&pasic3_driver, pasic3_probe);
251 }
252
253 static void __exit pasic3_base_exit(void)
254 {
255         platform_driver_unregister(&pasic3_driver);
256 }
257
258 module_init(pasic3_base_init);
259 module_exit(pasic3_base_exit);
260
261 MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
262 MODULE_DESCRIPTION("Core driver for HTC PASIC3");
263 MODULE_LICENSE("GPL");