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