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  */
32int 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}
43EXPORT_SYMBOL_GPL(pcf50633_read_block);
44
45/* Write a block of up to 32 regs  */
46int 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}
51EXPORT_SYMBOL_GPL(pcf50633_write_block);
52
53u8 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}
64EXPORT_SYMBOL_GPL(pcf50633_reg_read);
65
66int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
67{
68	return regmap_write(pcf->regmap, reg, val);
69}
70EXPORT_SYMBOL_GPL(pcf50633_reg_write);
71
72int 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}
76EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
77
78int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
79{
80	return regmap_update_bits(pcf->regmap, reg, val, 0);
81}
82EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
83
84/* sysfs attributes */
85static 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		buf1 += sprintf(buf1, "%*ph\n", (int)sizeof(dump), dump);
110	}
111
112	return buf1 - buf;
113}
114static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
115
116static ssize_t show_resume_reason(struct device *dev,
117				struct device_attribute *attr, char *buf)
118{
119	struct pcf50633 *pcf = dev_get_drvdata(dev);
120	int n;
121
122	n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
123				pcf->resume_reason[0],
124				pcf->resume_reason[1],
125				pcf->resume_reason[2],
126				pcf->resume_reason[3],
127				pcf->resume_reason[4]);
128
129	return n;
130}
131static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
132
133static struct attribute *pcf_sysfs_entries[] = {
134	&dev_attr_dump_regs.attr,
135	&dev_attr_resume_reason.attr,
136	NULL,
137};
138
139static struct attribute_group pcf_attr_group = {
140	.name	= NULL,			/* put in device directory */
141	.attrs	= pcf_sysfs_entries,
142};
143
144static void
145pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
146						struct platform_device **pdev)
147{
148	int ret;
149
150	*pdev = platform_device_alloc(name, -1);
151	if (!*pdev) {
152		dev_err(pcf->dev, "Falied to allocate %s\n", name);
153		return;
154	}
155
156	(*pdev)->dev.parent = pcf->dev;
157
158	ret = platform_device_add(*pdev);
159	if (ret) {
160		dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
161		platform_device_put(*pdev);
162		*pdev = NULL;
163	}
164}
165
166#ifdef CONFIG_PM_SLEEP
167static int pcf50633_suspend(struct device *dev)
168{
169	struct i2c_client *client = to_i2c_client(dev);
170	struct pcf50633 *pcf = i2c_get_clientdata(client);
171
172	return pcf50633_irq_suspend(pcf);
173}
174
175static int pcf50633_resume(struct device *dev)
176{
177	struct i2c_client *client = to_i2c_client(dev);
178	struct pcf50633 *pcf = i2c_get_clientdata(client);
179
180	return pcf50633_irq_resume(pcf);
181}
182#endif
183
184static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
185
186static const struct regmap_config pcf50633_regmap_config = {
187	.reg_bits = 8,
188	.val_bits = 8,
189};
190
191static int pcf50633_probe(struct i2c_client *client,
192				const struct i2c_device_id *ids)
193{
194	struct pcf50633 *pcf;
195	struct platform_device *pdev;
196	struct pcf50633_platform_data *pdata = dev_get_platdata(&client->dev);
197	int i, j, ret;
198	int version, variant;
199
200	if (!client->irq) {
201		dev_err(&client->dev, "Missing IRQ\n");
202		return -ENOENT;
203	}
204
205	pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL);
206	if (!pcf)
207		return -ENOMEM;
208
209	i2c_set_clientdata(client, pcf);
210	pcf->dev = &client->dev;
211	pcf->pdata = pdata;
212
213	mutex_init(&pcf->lock);
214
215	pcf->regmap = devm_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", ret);
219		return ret;
220	}
221
222	version = pcf50633_reg_read(pcf, 0);
223	variant = pcf50633_reg_read(pcf, 1);
224	if (version < 0 || variant < 0) {
225		dev_err(pcf->dev, "Unable to probe pcf50633\n");
226		ret = -ENODEV;
227		return ret;
228	}
229
230	dev_info(pcf->dev, "Probed device version %d variant %d\n",
231							version, variant);
232
233	pcf50633_irq_init(pcf, client->irq);
234
235	/* Create sub devices */
236	pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev);
237	pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev);
238	pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev);
239	pcf50633_client_dev_register(pcf, "pcf50633-adc", &pcf->adc_pdev);
240	pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_pdev);
241
242
243	for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
244		pdev = platform_device_alloc("pcf50633-regulator", i);
245		if (!pdev)
246			return -ENOMEM;
247
248		pdev->dev.parent = pcf->dev;
249		ret = platform_device_add_data(pdev, &pdata->reg_init_data[i],
250					       sizeof(pdata->reg_init_data[i]));
251		if (ret)
252			goto err;
253
254		ret = platform_device_add(pdev);
255		if (ret)
256			goto err;
257
258		pcf->regulator_pdev[i] = pdev;
259	}
260
261	ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
262	if (ret)
263		dev_warn(pcf->dev, "error creating sysfs entries\n");
264
265	if (pdata->probe_done)
266		pdata->probe_done(pcf);
267
268	return 0;
269
270err:
271	platform_device_put(pdev);
272	for (j = 0; j < i; j++)
273		platform_device_put(pcf->regulator_pdev[j]);
274
275	return ret;
276}
277
278static int pcf50633_remove(struct i2c_client *client)
279{
280	struct pcf50633 *pcf = i2c_get_clientdata(client);
281	int i;
282
283	sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
284	pcf50633_irq_free(pcf);
285
286	platform_device_unregister(pcf->input_pdev);
287	platform_device_unregister(pcf->rtc_pdev);
288	platform_device_unregister(pcf->mbc_pdev);
289	platform_device_unregister(pcf->adc_pdev);
290	platform_device_unregister(pcf->bl_pdev);
291
292	for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
293		platform_device_unregister(pcf->regulator_pdev[i]);
294
295	return 0;
296}
297
298static const struct i2c_device_id pcf50633_id_table[] = {
299	{"pcf50633", 0x73},
300	{/* end of list */}
301};
302MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
303
304static struct i2c_driver pcf50633_driver = {
305	.driver = {
306		.name	= "pcf50633",
307		.pm	= &pcf50633_pm,
308	},
309	.id_table = pcf50633_id_table,
310	.probe = pcf50633_probe,
311	.remove = pcf50633_remove,
312};
313
314static int __init pcf50633_init(void)
315{
316	return i2c_add_driver(&pcf50633_driver);
317}
318
319static void __exit pcf50633_exit(void)
320{
321	i2c_del_driver(&pcf50633_driver);
322}
323
324MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
325MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
326MODULE_LICENSE("GPL");
327
328subsys_initcall(pcf50633_init);
329module_exit(pcf50633_exit);
330