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5dc3339a PZ |
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 | ||
5dc3339a PZ |
15 | #include <linux/gpio.h> |
16 | #include <linux/io.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/interrupt.h> | |
0254a8f4 PZ |
19 | #include <linux/mfd/core.h> |
20 | #include <linux/mfd/ds1wm.h> | |
5dc3339a PZ |
21 | #include <linux/mfd/htc-pasic3.h> |
22 | ||
5dc3339a PZ |
23 | struct pasic3_data { |
24 | void __iomem *mapping; | |
25 | unsigned int bus_shift; | |
5dc3339a PZ |
26 | }; |
27 | ||
28 | #define REG_ADDR 5 | |
29 | #define REG_DATA 6 | |
5dc3339a PZ |
30 | |
31 | #define READ_MODE 0x80 | |
32 | ||
33 | /* | |
34 | * write to a secondary register on the PASIC3 | |
35 | */ | |
36 | void pasic3_write_register(struct device *dev, u32 reg, u8 val) | |
37 | { | |
1902a9e6 | 38 | struct pasic3_data *asic = dev_get_drvdata(dev); |
5dc3339a PZ |
39 | int bus_shift = asic->bus_shift; |
40 | void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift); | |
41 | void __iomem *data = asic->mapping + (REG_DATA << bus_shift); | |
42 | ||
43 | __raw_writeb(~READ_MODE & reg, addr); | |
44 | __raw_writeb(val, data); | |
45 | } | |
46 | EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */ | |
47 | ||
48 | /* | |
49 | * read from a secondary register on the PASIC3 | |
50 | */ | |
51 | u8 pasic3_read_register(struct device *dev, u32 reg) | |
52 | { | |
1902a9e6 | 53 | struct pasic3_data *asic = dev_get_drvdata(dev); |
5dc3339a PZ |
54 | int bus_shift = asic->bus_shift; |
55 | void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift); | |
56 | void __iomem *data = asic->mapping + (REG_DATA << bus_shift); | |
57 | ||
58 | __raw_writeb(READ_MODE | reg, addr); | |
59 | return __raw_readb(data); | |
60 | } | |
61 | EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */ | |
62 | ||
63 | /* | |
64 | * LEDs | |
65 | */ | |
66 | ||
0254a8f4 PZ |
67 | static struct mfd_cell led_cell __initdata = { |
68 | .name = "leds-pasic3", | |
69 | }; | |
5dc3339a PZ |
70 | |
71 | /* | |
72 | * DS1WM | |
73 | */ | |
74 | ||
0254a8f4 | 75 | static int ds1wm_enable(struct platform_device *pdev) |
5dc3339a PZ |
76 | { |
77 | struct device *dev = pdev->dev.parent; | |
78 | int c; | |
79 | ||
80 | c = pasic3_read_register(dev, 0x28); | |
81 | pasic3_write_register(dev, 0x28, c & 0x7f); | |
82 | ||
83 | dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f); | |
0254a8f4 | 84 | return 0; |
5dc3339a PZ |
85 | } |
86 | ||
0254a8f4 | 87 | static int ds1wm_disable(struct platform_device *pdev) |
5dc3339a PZ |
88 | { |
89 | struct device *dev = pdev->dev.parent; | |
90 | int c; | |
91 | ||
92 | c = pasic3_read_register(dev, 0x28); | |
93 | pasic3_write_register(dev, 0x28, c | 0x80); | |
94 | ||
95 | dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80); | |
0254a8f4 | 96 | return 0; |
5dc3339a PZ |
97 | } |
98 | ||
0254a8f4 PZ |
99 | static struct ds1wm_driver_data ds1wm_pdata = { |
100 | .active_high = 0, | |
5dc3339a PZ |
101 | }; |
102 | ||
0254a8f4 PZ |
103 | static struct resource ds1wm_resources[] __initdata = { |
104 | [0] = { | |
105 | .start = 0, | |
106 | .flags = IORESOURCE_MEM, | |
107 | }, | |
108 | [1] = { | |
109 | .start = 0, | |
110 | .end = 0, | |
111 | .flags = IORESOURCE_IRQ, | |
112 | }, | |
113 | }; | |
5dc3339a | 114 | |
0254a8f4 PZ |
115 | static struct mfd_cell ds1wm_cell __initdata = { |
116 | .name = "ds1wm", | |
117 | .enable = ds1wm_enable, | |
118 | .disable = ds1wm_disable, | |
119 | .driver_data = &ds1wm_pdata, | |
120 | .num_resources = 2, | |
121 | .resources = ds1wm_resources, | |
122 | }; | |
5dc3339a PZ |
123 | |
124 | static int __init pasic3_probe(struct platform_device *pdev) | |
125 | { | |
126 | struct pasic3_platform_data *pdata = pdev->dev.platform_data; | |
127 | struct device *dev = &pdev->dev; | |
128 | struct pasic3_data *asic; | |
129 | struct resource *r; | |
130 | int ret; | |
0254a8f4 PZ |
131 | int irq = 0; |
132 | ||
133 | r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
134 | if (r) { | |
135 | ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags & | |
136 | (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE)); | |
137 | irq = r->start; | |
138 | } | |
139 | ||
140 | r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
141 | if (r) { | |
142 | ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags & | |
143 | (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE)); | |
144 | irq = r->start; | |
145 | } | |
5dc3339a PZ |
146 | |
147 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
148 | if (!r) | |
149 | return -ENXIO; | |
150 | ||
0254a8f4 | 151 | if (!request_mem_region(r->start, resource_size(r), "pasic3")) |
5dc3339a PZ |
152 | return -EBUSY; |
153 | ||
154 | asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL); | |
155 | if (!asic) | |
156 | return -ENOMEM; | |
157 | ||
158 | platform_set_drvdata(pdev, asic); | |
159 | ||
0254a8f4 | 160 | asic->mapping = ioremap(r->start, resource_size(r)); |
5dc3339a PZ |
161 | if (!asic->mapping) { |
162 | dev_err(dev, "couldn't ioremap PASIC3\n"); | |
163 | kfree(asic); | |
164 | return -ENOMEM; | |
165 | } | |
166 | ||
0254a8f4 PZ |
167 | /* calculate bus shift from mem resource */ |
168 | asic->bus_shift = (resource_size(r) - 5) >> 3; | |
169 | ||
47c10edd PZ |
170 | if (pdata && pdata->clock_rate) { |
171 | ds1wm_pdata.clock_rate = pdata->clock_rate; | |
172 | /* the first 5 PASIC3 registers control the DS1WM */ | |
173 | ds1wm_resources[0].end = (5 << asic->bus_shift) - 1; | |
174 | ds1wm_cell.platform_data = &ds1wm_cell; | |
175 | ds1wm_cell.data_size = sizeof(ds1wm_cell); | |
176 | ret = mfd_add_devices(&pdev->dev, pdev->id, | |
177 | &ds1wm_cell, 1, r, irq); | |
178 | if (ret < 0) | |
179 | dev_warn(dev, "failed to register DS1WM\n"); | |
180 | } | |
181 | ||
182 | if (pdata && pdata->led_pdata) { | |
0254a8f4 PZ |
183 | led_cell.driver_data = pdata->led_pdata; |
184 | led_cell.platform_data = &led_cell; | |
185 | led_cell.data_size = sizeof(ds1wm_cell); | |
186 | ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, 0); | |
5dc3339a PZ |
187 | if (ret < 0) |
188 | dev_warn(dev, "failed to register LED device\n"); | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static int pasic3_remove(struct platform_device *pdev) | |
195 | { | |
196 | struct pasic3_data *asic = platform_get_drvdata(pdev); | |
197 | struct resource *r; | |
198 | ||
0254a8f4 | 199 | mfd_remove_devices(&pdev->dev); |
5dc3339a PZ |
200 | |
201 | iounmap(asic->mapping); | |
202 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
0254a8f4 | 203 | release_mem_region(r->start, resource_size(r)); |
5dc3339a PZ |
204 | kfree(asic); |
205 | return 0; | |
206 | } | |
207 | ||
4f46d6e7 KS |
208 | MODULE_ALIAS("platform:pasic3"); |
209 | ||
5dc3339a PZ |
210 | static struct platform_driver pasic3_driver = { |
211 | .driver = { | |
212 | .name = "pasic3", | |
213 | }, | |
214 | .remove = pasic3_remove, | |
215 | }; | |
216 | ||
217 | static int __init pasic3_base_init(void) | |
218 | { | |
219 | return platform_driver_probe(&pasic3_driver, pasic3_probe); | |
220 | } | |
221 | ||
222 | static void __exit pasic3_base_exit(void) | |
223 | { | |
224 | platform_driver_unregister(&pasic3_driver); | |
225 | } | |
226 | ||
227 | module_init(pasic3_base_init); | |
228 | module_exit(pasic3_base_exit); | |
229 | ||
230 | MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>"); | |
231 | MODULE_DESCRIPTION("Core driver for HTC PASIC3"); | |
232 | MODULE_LICENSE("GPL"); |