input: Touchscreen driver for TPS6507x
[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 };
103
104 static struct resource ds1wm_resources[] __initdata = {
105         [0] = {
106                 .start  = 0,
107                 .flags  = IORESOURCE_MEM,
108         },
109         [1] = {
110                 .start  = 0,
111                 .end    = 0,
112                 .flags  = IORESOURCE_IRQ,
113         },
114 };
115
116 static struct mfd_cell ds1wm_cell __initdata = {
117         .name          = "ds1wm",
118         .enable        = ds1wm_enable,
119         .disable       = ds1wm_disable,
120         .driver_data   = &ds1wm_pdata,
121         .num_resources = 2,
122         .resources     = ds1wm_resources,
123 };
124
125 static int __init pasic3_probe(struct platform_device *pdev)
126 {
127         struct pasic3_platform_data *pdata = pdev->dev.platform_data;
128         struct device *dev = &pdev->dev;
129         struct pasic3_data *asic;
130         struct resource *r;
131         int ret;
132         int irq = 0;
133
134         r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
135         if (r) {
136                 ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
137                         (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
138                 irq = r->start;
139         }
140
141         r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
142         if (r) {
143                 ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
144                         (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
145                 irq = r->start;
146         }
147
148         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
149         if (!r)
150                 return -ENXIO;
151
152         if (!request_mem_region(r->start, resource_size(r), "pasic3"))
153                 return -EBUSY;
154
155         asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
156         if (!asic)
157                 return -ENOMEM;
158
159         platform_set_drvdata(pdev, asic);
160
161         asic->mapping = ioremap(r->start, resource_size(r));
162         if (!asic->mapping) {
163                 dev_err(dev, "couldn't ioremap PASIC3\n");
164                 kfree(asic);
165                 return -ENOMEM;
166         }
167
168         /* calculate bus shift from mem resource */
169         asic->bus_shift = (resource_size(r) - 5) >> 3;
170
171         if (pdata && pdata->clock_rate) {
172                 ds1wm_pdata.clock_rate = pdata->clock_rate;
173                 /* the first 5 PASIC3 registers control the DS1WM */
174                 ds1wm_resources[0].end = (5 << asic->bus_shift) - 1;
175                 ds1wm_cell.platform_data = &ds1wm_cell;
176                 ds1wm_cell.data_size = sizeof(ds1wm_cell);
177                 ret = mfd_add_devices(&pdev->dev, pdev->id,
178                                 &ds1wm_cell, 1, r, irq);
179                 if (ret < 0)
180                         dev_warn(dev, "failed to register DS1WM\n");
181         }
182
183         if (pdata && pdata->led_pdata) {
184                 led_cell.driver_data = pdata->led_pdata;
185                 led_cell.platform_data = &led_cell;
186                 led_cell.data_size = sizeof(ds1wm_cell);
187                 ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, 0);
188                 if (ret < 0)
189                         dev_warn(dev, "failed to register LED device\n");
190         }
191
192         return 0;
193 }
194
195 static int pasic3_remove(struct platform_device *pdev)
196 {
197         struct pasic3_data *asic = platform_get_drvdata(pdev);
198         struct resource *r;
199
200         mfd_remove_devices(&pdev->dev);
201
202         iounmap(asic->mapping);
203         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
204         release_mem_region(r->start, resource_size(r));
205         kfree(asic);
206         return 0;
207 }
208
209 MODULE_ALIAS("platform:pasic3");
210
211 static struct platform_driver pasic3_driver = {
212         .driver         = {
213                 .name   = "pasic3",
214         },
215         .remove         = pasic3_remove,
216 };
217
218 static int __init pasic3_base_init(void)
219 {
220         return platform_driver_probe(&pasic3_driver, pasic3_probe);
221 }
222
223 static void __exit pasic3_base_exit(void)
224 {
225         platform_driver_unregister(&pasic3_driver);
226 }
227
228 module_init(pasic3_base_init);
229 module_exit(pasic3_base_exit);
230
231 MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
232 MODULE_DESCRIPTION("Core driver for HTC PASIC3");
233 MODULE_LICENSE("GPL");