mfd: Refactor DB8500 PRCMU reg access
[linux-2.6.git] / drivers / mfd / pcf50633-core.c
1 /* NXP PCF50633 Power Management Unit (PMU) driver
2  *
3  * (C) 2006-2008 by Openmoko, Inc.
4  * Author: Harald Welte <laforge@openmoko.org>
5  *         Balaji Rao <balajirrao@openmoko.org>
6  * All rights reserved.
7  *
8  *  This program is free software; you can redistribute  it and/or modify it
9  *  under  the terms of  the GNU General  Public License as published by the
10  *  Free Software Foundation;  either version 2 of the  License, or (at your
11  *  option) any later version.
12  *
13  */
14
15 #include <linux/kernel.h>
16 #include <linux/device.h>
17 #include <linux/sysfs.h>
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/interrupt.h>
21 #include <linux/workqueue.h>
22 #include <linux/platform_device.h>
23 #include <linux/i2c.h>
24 #include <linux/pm.h>
25 #include <linux/slab.h>
26 #include <linux/regmap.h>
27 #include <linux/err.h>
28
29 #include <linux/mfd/pcf50633/core.h>
30
31 /* Read a block of up to 32 regs  */
32 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
33                                         int nr_regs, u8 *data)
34 {
35         int ret;
36
37         ret = regmap_raw_read(pcf->regmap, reg, data, nr_regs);
38         if (ret != 0)
39                 return ret;
40
41         return nr_regs;
42 }
43 EXPORT_SYMBOL_GPL(pcf50633_read_block);
44
45 /* Write a block of up to 32 regs  */
46 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
47                                         int nr_regs, u8 *data)
48 {
49         int ret;
50
51         ret = regmap_raw_write(pcf->regmap, reg, data, nr_regs);
52         if (ret != 0)
53                 return ret;
54
55         return nr_regs;
56 }
57 EXPORT_SYMBOL_GPL(pcf50633_write_block);
58
59 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
60 {
61         unsigned int val;
62         int ret;
63
64         ret = regmap_read(pcf->regmap, reg, &val);
65         if (ret < 0)
66                 return -1;
67
68         return val;
69 }
70 EXPORT_SYMBOL_GPL(pcf50633_reg_read);
71
72 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
73 {
74         return regmap_write(pcf->regmap, reg, val);
75 }
76 EXPORT_SYMBOL_GPL(pcf50633_reg_write);
77
78 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
79 {
80         return regmap_update_bits(pcf->regmap, reg, mask, val);
81 }
82 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
83
84 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
85 {
86         return regmap_update_bits(pcf->regmap, reg, val, 0);
87 }
88 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
89
90 /* sysfs attributes */
91 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
92                             char *buf)
93 {
94         struct pcf50633 *pcf = dev_get_drvdata(dev);
95         u8 dump[16];
96         int n, n1, idx = 0;
97         char *buf1 = buf;
98         static u8 address_no_read[] = { /* must be ascending */
99                 PCF50633_REG_INT1,
100                 PCF50633_REG_INT2,
101                 PCF50633_REG_INT3,
102                 PCF50633_REG_INT4,
103                 PCF50633_REG_INT5,
104                 0 /* terminator */
105         };
106
107         for (n = 0; n < 256; n += sizeof(dump)) {
108                 for (n1 = 0; n1 < sizeof(dump); n1++)
109                         if (n == address_no_read[idx]) {
110                                 idx++;
111                                 dump[n1] = 0x00;
112                         } else
113                                 dump[n1] = pcf50633_reg_read(pcf, n + n1);
114
115                 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
116                 buf1 += strlen(buf1);
117                 *buf1++ = '\n';
118                 *buf1 = '\0';
119         }
120
121         return buf1 - buf;
122 }
123 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
124
125 static ssize_t show_resume_reason(struct device *dev,
126                                 struct device_attribute *attr, char *buf)
127 {
128         struct pcf50633 *pcf = dev_get_drvdata(dev);
129         int n;
130
131         n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
132                                 pcf->resume_reason[0],
133                                 pcf->resume_reason[1],
134                                 pcf->resume_reason[2],
135                                 pcf->resume_reason[3],
136                                 pcf->resume_reason[4]);
137
138         return n;
139 }
140 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
141
142 static struct attribute *pcf_sysfs_entries[] = {
143         &dev_attr_dump_regs.attr,
144         &dev_attr_resume_reason.attr,
145         NULL,
146 };
147
148 static struct attribute_group pcf_attr_group = {
149         .name   = NULL,                 /* put in device directory */
150         .attrs  = pcf_sysfs_entries,
151 };
152
153 static void
154 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
155                                                 struct platform_device **pdev)
156 {
157         int ret;
158
159         *pdev = platform_device_alloc(name, -1);
160         if (!*pdev) {
161                 dev_err(pcf->dev, "Falied to allocate %s\n", name);
162                 return;
163         }
164
165         (*pdev)->dev.parent = pcf->dev;
166
167         ret = platform_device_add(*pdev);
168         if (ret) {
169                 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
170                 platform_device_put(*pdev);
171                 *pdev = NULL;
172         }
173 }
174
175 #ifdef CONFIG_PM_SLEEP
176 static int pcf50633_suspend(struct device *dev)
177 {
178         struct i2c_client *client = to_i2c_client(dev);
179         struct pcf50633 *pcf = i2c_get_clientdata(client);
180
181         return pcf50633_irq_suspend(pcf);
182 }
183
184 static int pcf50633_resume(struct device *dev)
185 {
186         struct i2c_client *client = to_i2c_client(dev);
187         struct pcf50633 *pcf = i2c_get_clientdata(client);
188
189         return pcf50633_irq_resume(pcf);
190 }
191 #endif
192
193 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
194
195 static struct regmap_config pcf50633_regmap_config = {
196         .reg_bits = 8,
197         .val_bits = 8,
198 };
199
200 static int __devinit pcf50633_probe(struct i2c_client *client,
201                                 const struct i2c_device_id *ids)
202 {
203         struct pcf50633 *pcf;
204         struct pcf50633_platform_data *pdata = client->dev.platform_data;
205         int i, ret;
206         int version, variant;
207
208         if (!client->irq) {
209                 dev_err(&client->dev, "Missing IRQ\n");
210                 return -ENOENT;
211         }
212
213         pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
214         if (!pcf)
215                 return -ENOMEM;
216
217         pcf->pdata = pdata;
218
219         mutex_init(&pcf->lock);
220
221         pcf->regmap = regmap_init_i2c(client, &pcf50633_regmap_config);
222         if (IS_ERR(pcf->regmap)) {
223                 ret = PTR_ERR(pcf->regmap);
224                 dev_err(pcf->dev, "Failed to allocate register map: %d\n",
225                         ret);
226                 goto err_free;
227         }
228
229         i2c_set_clientdata(client, pcf);
230         pcf->dev = &client->dev;
231
232         version = pcf50633_reg_read(pcf, 0);
233         variant = pcf50633_reg_read(pcf, 1);
234         if (version < 0 || variant < 0) {
235                 dev_err(pcf->dev, "Unable to probe pcf50633\n");
236                 ret = -ENODEV;
237                 goto err_regmap;
238         }
239
240         dev_info(pcf->dev, "Probed device version %d variant %d\n",
241                                                         version, variant);
242
243         pcf50633_irq_init(pcf, client->irq);
244
245         /* Create sub devices */
246         pcf50633_client_dev_register(pcf, "pcf50633-input",
247                                                 &pcf->input_pdev);
248         pcf50633_client_dev_register(pcf, "pcf50633-rtc",
249                                                 &pcf->rtc_pdev);
250         pcf50633_client_dev_register(pcf, "pcf50633-mbc",
251                                                 &pcf->mbc_pdev);
252         pcf50633_client_dev_register(pcf, "pcf50633-adc",
253                                                 &pcf->adc_pdev);
254         pcf50633_client_dev_register(pcf, "pcf50633-backlight",
255                                                 &pcf->bl_pdev);
256
257
258         for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
259                 struct platform_device *pdev;
260
261                 pdev = platform_device_alloc("pcf50633-regltr", i);
262                 if (!pdev) {
263                         dev_err(pcf->dev, "Cannot create regulator %d\n", i);
264                         continue;
265                 }
266
267                 pdev->dev.parent = pcf->dev;
268                 platform_device_add_data(pdev, &pdata->reg_init_data[i],
269                                         sizeof(pdata->reg_init_data[i]));
270                 pcf->regulator_pdev[i] = pdev;
271
272                 platform_device_add(pdev);
273         }
274
275         ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
276         if (ret)
277                 dev_err(pcf->dev, "error creating sysfs entries\n");
278
279         if (pdata->probe_done)
280                 pdata->probe_done(pcf);
281
282         return 0;
283
284 err_regmap:
285         regmap_exit(pcf->regmap);
286 err_free:
287         kfree(pcf);
288
289         return ret;
290 }
291
292 static int __devexit pcf50633_remove(struct i2c_client *client)
293 {
294         struct pcf50633 *pcf = i2c_get_clientdata(client);
295         int i;
296
297         sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
298         pcf50633_irq_free(pcf);
299
300         platform_device_unregister(pcf->input_pdev);
301         platform_device_unregister(pcf->rtc_pdev);
302         platform_device_unregister(pcf->mbc_pdev);
303         platform_device_unregister(pcf->adc_pdev);
304         platform_device_unregister(pcf->bl_pdev);
305
306         for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
307                 platform_device_unregister(pcf->regulator_pdev[i]);
308
309         regmap_exit(pcf->regmap);
310         kfree(pcf);
311
312         return 0;
313 }
314
315 static const struct i2c_device_id pcf50633_id_table[] = {
316         {"pcf50633", 0x73},
317         {/* end of list */}
318 };
319 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
320
321 static struct i2c_driver pcf50633_driver = {
322         .driver = {
323                 .name   = "pcf50633",
324                 .pm     = &pcf50633_pm,
325         },
326         .id_table = pcf50633_id_table,
327         .probe = pcf50633_probe,
328         .remove = __devexit_p(pcf50633_remove),
329 };
330
331 static int __init pcf50633_init(void)
332 {
333         return i2c_add_driver(&pcf50633_driver);
334 }
335
336 static void __exit pcf50633_exit(void)
337 {
338         i2c_del_driver(&pcf50633_driver);
339 }
340
341 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
342 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
343 MODULE_LICENSE("GPL");
344
345 subsys_initcall(pcf50633_init);
346 module_exit(pcf50633_exit);