Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/juhl/trivial
[linux-2.6] / 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 #include <asm/arch/pxa-regs.h>
23
24 struct pasic3_data {
25         void __iomem *mapping;
26         unsigned int bus_shift;
27         struct platform_device *ds1wm_pdev;
28         struct platform_device *led_pdev;
29 };
30
31 #define REG_ADDR  5
32 #define REG_DATA  6
33 #define NUM_REGS  7
34
35 #define READ_MODE 0x80
36
37 /*
38  * write to a secondary register on the PASIC3
39  */
40 void pasic3_write_register(struct device *dev, u32 reg, u8 val)
41 {
42         struct pasic3_data *asic = dev->driver_data;
43         int bus_shift = asic->bus_shift;
44         void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
45         void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
46
47         __raw_writeb(~READ_MODE & reg, addr);
48         __raw_writeb(val, data);
49 }
50 EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
51
52 /*
53  * read from a secondary register on the PASIC3
54  */
55 u8 pasic3_read_register(struct device *dev, u32 reg)
56 {
57         struct pasic3_data *asic = dev->driver_data;
58         int bus_shift = asic->bus_shift;
59         void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
60         void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
61
62         __raw_writeb(READ_MODE | reg, addr);
63         return __raw_readb(data);
64 }
65 EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
66
67 /*
68  * LEDs
69  */
70
71 static int led_device_add(struct device *pasic3_dev,
72                                 const struct pasic3_leds_machinfo *pdata)
73 {
74         struct pasic3_data *asic = pasic3_dev->driver_data;
75         struct platform_device *pdev;
76         int ret;
77
78         pdev = platform_device_alloc("pasic3-led", -1);
79         if (!pdev) {
80                 dev_dbg(pasic3_dev, "failed to allocate LED platform device\n");
81                 return -ENOMEM;
82         }
83
84         ret = platform_device_add_data(pdev, pdata,
85                                         sizeof(struct pasic3_leds_machinfo));
86         if (ret < 0) {
87                 dev_dbg(pasic3_dev, "failed to add LED platform data\n");
88                 goto exit_pdev_put;
89         }
90
91         pdev->dev.parent = pasic3_dev;
92         ret = platform_device_add(pdev);
93         if (ret < 0) {
94                 dev_dbg(pasic3_dev, "failed to add LED platform device\n");
95                 goto exit_pdev_put;
96         }
97
98         asic->led_pdev = pdev;
99         return 0;
100
101 exit_pdev_put:
102         platform_device_put(pdev);
103         return ret;
104 }
105
106 /*
107  * DS1WM
108  */
109
110 static void ds1wm_enable(struct platform_device *pdev)
111 {
112         struct device *dev = pdev->dev.parent;
113         int c;
114
115         c = pasic3_read_register(dev, 0x28);
116         pasic3_write_register(dev, 0x28, c & 0x7f);
117
118         dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
119 }
120
121 static void ds1wm_disable(struct platform_device *pdev)
122 {
123         struct device *dev = pdev->dev.parent;
124         int c;
125
126         c = pasic3_read_register(dev, 0x28);
127         pasic3_write_register(dev, 0x28, c | 0x80);
128
129         dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
130 }
131
132 static struct ds1wm_platform_data ds1wm_pdata = {
133         .bus_shift = 2,
134         .enable    = ds1wm_enable,
135         .disable   = ds1wm_disable,
136 };
137
138 static int ds1wm_device_add(struct device *pasic3_dev, int bus_shift)
139 {
140         struct pasic3_data *asic = pasic3_dev->driver_data;
141         struct platform_device *pdev;
142         int ret;
143
144         pdev = platform_device_alloc("ds1wm", -1);
145         if (!pdev) {
146                 dev_dbg(pasic3_dev, "failed to allocate DS1WM platform device\n");
147                 return -ENOMEM;
148         }
149
150         ret = platform_device_add_resources(pdev, pdev->resource,
151                                                 pdev->num_resources);
152         if (ret < 0) {
153                 dev_dbg(pasic3_dev, "failed to add DS1WM resources\n");
154                 goto exit_pdev_put;
155         }
156
157         ds1wm_pdata.bus_shift = asic->bus_shift;
158         ret = platform_device_add_data(pdev, &ds1wm_pdata,
159                                         sizeof(struct ds1wm_platform_data));
160         if (ret < 0) {
161                 dev_dbg(pasic3_dev, "failed to add DS1WM platform data\n");
162                 goto exit_pdev_put;
163         }
164
165         pdev->dev.parent = pasic3_dev;
166         ret = platform_device_add(pdev);
167         if (ret < 0) {
168                 dev_dbg(pasic3_dev, "failed to add DS1WM platform device\n");
169                 goto exit_pdev_put;
170         }
171
172         asic->ds1wm_pdev = pdev;
173         return 0;
174
175 exit_pdev_put:
176         platform_device_put(pdev);
177         return ret;
178 }
179
180 static int __init pasic3_probe(struct platform_device *pdev)
181 {
182         struct pasic3_platform_data *pdata = pdev->dev.platform_data;
183         struct device *dev = &pdev->dev;
184         struct pasic3_data *asic;
185         struct resource *r;
186         int ret;
187
188         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
189         if (!r)
190                 return -ENXIO;
191
192         if (!request_mem_region(r->start, r->end - r->start + 1, "pasic3"))
193                 return -EBUSY;
194
195         asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
196         if (!asic)
197                 return -ENOMEM;
198
199         platform_set_drvdata(pdev, asic);
200
201         if (pdata && pdata->bus_shift)
202                 asic->bus_shift = pdata->bus_shift;
203         else
204                 asic->bus_shift = 2;
205
206         asic->mapping = ioremap(r->start, r->end - r->start + 1);
207         if (!asic->mapping) {
208                 dev_err(dev, "couldn't ioremap PASIC3\n");
209                 kfree(asic);
210                 return -ENOMEM;
211         }
212
213         ret = ds1wm_device_add(dev, asic->bus_shift);
214         if (ret < 0)
215                 dev_warn(dev, "failed to register DS1WM\n");
216
217         if (pdata->led_pdata) {
218                 ret = led_device_add(dev, pdata->led_pdata);
219                 if (ret < 0)
220                         dev_warn(dev, "failed to register LED device\n");
221         }
222
223         return 0;
224 }
225
226 static int pasic3_remove(struct platform_device *pdev)
227 {
228         struct pasic3_data *asic = platform_get_drvdata(pdev);
229         struct resource *r;
230
231         if (asic->led_pdev)
232                 platform_device_unregister(asic->led_pdev);
233         if (asic->ds1wm_pdev)
234                 platform_device_unregister(asic->ds1wm_pdev);
235
236         iounmap(asic->mapping);
237         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
238         release_mem_region(r->start, r->end - r->start + 1);
239         kfree(asic);
240         return 0;
241 }
242
243 static struct platform_driver pasic3_driver = {
244         .driver         = {
245                 .name   = "pasic3",
246         },
247         .remove         = pasic3_remove,
248 };
249
250 static int __init pasic3_base_init(void)
251 {
252         return platform_driver_probe(&pasic3_driver, pasic3_probe);
253 }
254
255 static void __exit pasic3_base_exit(void)
256 {
257         platform_driver_unregister(&pasic3_driver);
258 }
259
260 module_init(pasic3_base_init);
261 module_exit(pasic3_base_exit);
262
263 MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
264 MODULE_DESCRIPTION("Core driver for HTC PASIC3");
265 MODULE_LICENSE("GPL");