mfd: Simulate active high IRQs with wm831x
[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/gpio.h>
16 #include <linux/io.h>
17 #include <linux/irq.h>
18 #include <linux/interrupt.h>
19 #include <linux/mfd/core.h>
20 #include <linux/mfd/ds1wm.h>
21 #include <linux/mfd/htc-pasic3.h>
22 #include <linux/slab.h>
23
24 struct pasic3_data {
25         void __iomem *mapping;
26         unsigned int bus_shift;
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_get_drvdata(dev);
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_get_drvdata(dev);
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 struct mfd_cell led_cell __initdata = {
69         .name = "leds-pasic3",
70 };
71
72 /*
73  * DS1WM
74  */
75
76 static int ds1wm_enable(struct platform_device *pdev)
77 {
78         struct device *dev = pdev->dev.parent;
79         int c;
80
81         c = pasic3_read_register(dev, 0x28);
82         pasic3_write_register(dev, 0x28, c & 0x7f);
83
84         dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
85         return 0;
86 }
87
88 static int ds1wm_disable(struct platform_device *pdev)
89 {
90         struct device *dev = pdev->dev.parent;
91         int c;
92
93         c = pasic3_read_register(dev, 0x28);
94         pasic3_write_register(dev, 0x28, c | 0x80);
95
96         dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
97         return 0;
98 }
99
100 static struct ds1wm_driver_data ds1wm_pdata = {
101         .active_high = 0,
102         .reset_recover_delay = 1,
103 };
104
105 static struct resource ds1wm_resources[] __initdata = {
106         [0] = {
107                 .start  = 0,
108                 .flags  = IORESOURCE_MEM,
109         },
110         [1] = {
111                 .start  = 0,
112                 .end    = 0,
113                 .flags  = IORESOURCE_IRQ,
114         },
115 };
116
117 static struct mfd_cell ds1wm_cell __initdata = {
118         .name          = "ds1wm",
119         .enable        = ds1wm_enable,
120         .disable       = ds1wm_disable,
121         .platform_data = &ds1wm_pdata,
122         .pdata_size    = sizeof(ds1wm_pdata),
123         .num_resources = 2,
124         .resources     = ds1wm_resources,
125 };
126
127 static int __init pasic3_probe(struct platform_device *pdev)
128 {
129         struct pasic3_platform_data *pdata = pdev->dev.platform_data;
130         struct device *dev = &pdev->dev;
131         struct pasic3_data *asic;
132         struct resource *r;
133         int ret;
134         int irq = 0;
135
136         r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
137         if (r) {
138                 ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
139                         (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
140                 irq = r->start;
141         }
142
143         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144         if (!r)
145                 return -ENXIO;
146
147         if (!request_mem_region(r->start, resource_size(r), "pasic3"))
148                 return -EBUSY;
149
150         asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
151         if (!asic)
152                 return -ENOMEM;
153
154         platform_set_drvdata(pdev, asic);
155
156         asic->mapping = ioremap(r->start, resource_size(r));
157         if (!asic->mapping) {
158                 dev_err(dev, "couldn't ioremap PASIC3\n");
159                 kfree(asic);
160                 return -ENOMEM;
161         }
162
163         /* calculate bus shift from mem resource */
164         asic->bus_shift = (resource_size(r) - 5) >> 3;
165
166         if (pdata && pdata->clock_rate) {
167                 ds1wm_pdata.clock_rate = pdata->clock_rate;
168                 /* the first 5 PASIC3 registers control the DS1WM */
169                 ds1wm_resources[0].end = (5 << asic->bus_shift) - 1;
170                 ret = mfd_add_devices(&pdev->dev, pdev->id,
171                                 &ds1wm_cell, 1, r, irq);
172                 if (ret < 0)
173                         dev_warn(dev, "failed to register DS1WM\n");
174         }
175
176         if (pdata && pdata->led_pdata) {
177                 led_cell.platform_data = pdata->led_pdata;
178                 led_cell.pdata_size = sizeof(struct pasic3_leds_machinfo);
179                 ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, 0);
180                 if (ret < 0)
181                         dev_warn(dev, "failed to register LED device\n");
182         }
183
184         return 0;
185 }
186
187 static int pasic3_remove(struct platform_device *pdev)
188 {
189         struct pasic3_data *asic = platform_get_drvdata(pdev);
190         struct resource *r;
191
192         mfd_remove_devices(&pdev->dev);
193
194         iounmap(asic->mapping);
195         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
196         release_mem_region(r->start, resource_size(r));
197         kfree(asic);
198         return 0;
199 }
200
201 MODULE_ALIAS("platform:pasic3");
202
203 static struct platform_driver pasic3_driver = {
204         .driver         = {
205                 .name   = "pasic3",
206         },
207         .remove         = pasic3_remove,
208 };
209
210 static int __init pasic3_base_init(void)
211 {
212         return platform_driver_probe(&pasic3_driver, pasic3_probe);
213 }
214
215 static void __exit pasic3_base_exit(void)
216 {
217         platform_driver_unregister(&pasic3_driver);
218 }
219
220 module_init(pasic3_base_init);
221 module_exit(pasic3_base_exit);
222
223 MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
224 MODULE_DESCRIPTION("Core driver for HTC PASIC3");
225 MODULE_LICENSE("GPL");