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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, NULL); |
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, |
180 | 0, NULL); |
181 | if (ret < 0) |
182 | dev_warn(dev, "failed to register LED device\n"); |
183 | } |
184 | |
185 | return 0; |
186 | } |
187 | |
188 | static int pasic3_remove(struct platform_device *pdev) |
189 | { |
190 | struct pasic3_data *asic = platform_get_drvdata(pdev); |
191 | struct resource *r; |
192 | |
193 | mfd_remove_devices(&pdev->dev); |
194 | |
195 | iounmap(asic->mapping); |
196 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
197 | release_mem_region(r->start, resource_size(r)); |
198 | kfree(asic); |
199 | return 0; |
200 | } |
201 | |
202 | MODULE_ALIAS("platform:pasic3"); |
203 | |
204 | static struct platform_driver pasic3_driver = { |
205 | .driver = { |
206 | .name = "pasic3", |
207 | }, |
208 | .remove = pasic3_remove, |
209 | }; |
210 | |
211 | static int __init pasic3_base_init(void) |
212 | { |
213 | return platform_driver_probe(&pasic3_driver, pasic3_probe); |
214 | } |
215 | |
216 | static void __exit pasic3_base_exit(void) |
217 | { |
218 | platform_driver_unregister(&pasic3_driver); |
219 | } |
220 | |
221 | module_init(pasic3_base_init); |
222 | module_exit(pasic3_base_exit); |
223 | |
224 | MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>"); |
225 | MODULE_DESCRIPTION("Core driver for HTC PASIC3"); |
226 | MODULE_LICENSE("GPL"); |
227 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
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