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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
23struct pasic3_data {
24 void __iomem *mapping;
25 unsigned int bus_shift;
26};
27
28#define REG_ADDR 5
29#define REG_DATA 6
30
31#define READ_MODE 0x80
32
33
34
35
36void pasic3_write_register(struct device *dev, u32 reg, u8 val)
37{
38 struct pasic3_data *asic = dev->driver_data;
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}
46EXPORT_SYMBOL(pasic3_write_register);
47
48
49
50
51u8 pasic3_read_register(struct device *dev, u32 reg)
52{
53 struct pasic3_data *asic = dev->driver_data;
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}
61EXPORT_SYMBOL(pasic3_read_register);
62
63
64
65
66
67static struct mfd_cell led_cell __initdata = {
68 .name = "leds-pasic3",
69};
70
71
72
73
74
75static int ds1wm_enable(struct platform_device *pdev)
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);
84 return 0;
85}
86
87static int ds1wm_disable(struct platform_device *pdev)
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);
96 return 0;
97}
98
99static struct ds1wm_driver_data ds1wm_pdata = {
100 .active_high = 0,
101};
102
103static 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};
114
115static 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};
123
124static 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;
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 }
146
147 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
148 if (!r)
149 return -ENXIO;
150
151 if (!request_mem_region(r->start, resource_size(r), "pasic3"))
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
160 asic->mapping = ioremap(r->start, resource_size(r));
161 if (!asic->mapping) {
162 dev_err(dev, "couldn't ioremap PASIC3\n");
163 kfree(asic);
164 return -ENOMEM;
165 }
166
167
168 asic->bus_shift = (resource_size(r) - 5) >> 3;
169
170 if (pdata && pdata->clock_rate) {
171 ds1wm_pdata.clock_rate = pdata->clock_rate;
172
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) {
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);
187 if (ret < 0)
188 dev_warn(dev, "failed to register LED device\n");
189 }
190
191 return 0;
192}
193
194static int pasic3_remove(struct platform_device *pdev)
195{
196 struct pasic3_data *asic = platform_get_drvdata(pdev);
197 struct resource *r;
198
199 mfd_remove_devices(&pdev->dev);
200
201 iounmap(asic->mapping);
202 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
203 release_mem_region(r->start, resource_size(r));
204 kfree(asic);
205 return 0;
206}
207
208MODULE_ALIAS("platform:pasic3");
209
210static struct platform_driver pasic3_driver = {
211 .driver = {
212 .name = "pasic3",
213 },
214 .remove = pasic3_remove,
215};
216
217static int __init pasic3_base_init(void)
218{
219 return platform_driver_probe(&pasic3_driver, pasic3_probe);
220}
221
222static void __exit pasic3_base_exit(void)
223{
224 platform_driver_unregister(&pasic3_driver);
225}
226
227module_init(pasic3_base_init);
228module_exit(pasic3_base_exit);
229
230MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
231MODULE_DESCRIPTION("Core driver for HTC PASIC3");
232MODULE_LICENSE("GPL");
233
