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 */
pasic3_write_register(struct device * dev,u32 reg,u8 val)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 */
pasic3_read_register(struct device * dev,u32 reg)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
ds1wm_enable(struct platform_device * pdev)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
ds1wm_disable(struct platform_device * pdev)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
pasic3_probe(struct platform_device * pdev)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
pasic3_remove(struct platform_device * pdev)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
pasic3_base_init(void)210 static int __init pasic3_base_init(void)
211 {
212 return platform_driver_probe(&pasic3_driver, pasic3_probe);
213 }
214
pasic3_base_exit(void)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");
226