1// SPDX-License-Identifier: GPL-2.0-or-later
2/* NXP PCF50633 Power Management Unit (PMU) driver
3 *
4 * (C) 2006-2008 by Openmoko, Inc.
5 * Author: Harald Welte <laforge@openmoko.org>
6 * 	   Balaji Rao <balajirrao@openmoko.org>
7 * All rights reserved.
8 */
9
10#include <linux/kernel.h>
11#include <linux/device.h>
12#include <linux/sysfs.h>
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/interrupt.h>
16#include <linux/workqueue.h>
17#include <linux/platform_device.h>
18#include <linux/i2c.h>
19#include <linux/pm.h>
20#include <linux/slab.h>
21#include <linux/regmap.h>
22#include <linux/err.h>
23
24#include <linux/mfd/pcf50633/core.h>
25
26/* Read a block of up to 32 regs  */
27int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
28					int nr_regs, u8 *data)
29{
30	int ret;
31
32	ret = regmap_raw_read(pcf->regmap, reg, data, nr_regs);
33	if (ret != 0)
34		return ret;
35
36	return nr_regs;
37}
38EXPORT_SYMBOL_GPL(pcf50633_read_block);
39
40/* Write a block of up to 32 regs  */
41int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
42					int nr_regs, u8 *data)
43{
44	return regmap_raw_write(pcf->regmap, reg, data, nr_regs);
45}
46EXPORT_SYMBOL_GPL(pcf50633_write_block);
47
48u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
49{
50	unsigned int val;
51	int ret;
52
53	ret = regmap_read(pcf->regmap, reg, &val);
54	if (ret < 0)
55		return -1;
56
57	return val;
58}
59EXPORT_SYMBOL_GPL(pcf50633_reg_read);
60
61int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
62{
63	return regmap_write(pcf->regmap, reg, val);
64}
65EXPORT_SYMBOL_GPL(pcf50633_reg_write);
66
67int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
68{
69	return regmap_update_bits(pcf->regmap, reg, mask, val);
70}
71EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
72
73int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
74{
75	return regmap_update_bits(pcf->regmap, reg, val, 0);
76}
77EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
78
79/* sysfs attributes */
80static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
81			    char *buf)
82{
83	struct pcf50633 *pcf = dev_get_drvdata(dev);
84	u8 dump[16];
85	int n, n1, idx = 0;
86	char *buf1 = buf;
87	static u8 address_no_read[] = { /* must be ascending */
88		PCF50633_REG_INT1,
89		PCF50633_REG_INT2,
90		PCF50633_REG_INT3,
91		PCF50633_REG_INT4,
92		PCF50633_REG_INT5,
93		0 /* terminator */
94	};
95
96	for (n = 0; n < 256; n += sizeof(dump)) {
97		for (n1 = 0; n1 < sizeof(dump); n1++)
98			if (n == address_no_read[idx]) {
99				idx++;
100				dump[n1] = 0x00;
101			} else
102				dump[n1] = pcf50633_reg_read(pcf, n + n1);
103
104		buf1 += sprintf(buf1, "%*ph\n", (int)sizeof(dump), dump);
105	}
106
107	return buf1 - buf;
108}
109static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
110
111static ssize_t show_resume_reason(struct device *dev,
112				struct device_attribute *attr, char *buf)
113{
114	struct pcf50633 *pcf = dev_get_drvdata(dev);
115	int n;
116
117	n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
118				pcf->resume_reason[0],
119				pcf->resume_reason[1],
120				pcf->resume_reason[2],
121				pcf->resume_reason[3],
122				pcf->resume_reason[4]);
123
124	return n;
125}
126static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
127
128static struct attribute *pcf_sysfs_entries[] = {
129	&dev_attr_dump_regs.attr,
130	&dev_attr_resume_reason.attr,
131	NULL,
132};
133
134static struct attribute_group pcf_attr_group = {
135	.name	= NULL,			/* put in device directory */
136	.attrs	= pcf_sysfs_entries,
137};
138
139static void
140pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
141						struct platform_device **pdev)
142{
143	int ret;
144
145	*pdev = platform_device_alloc(name, -1);
146	if (!*pdev) {
147		dev_err(pcf->dev, "Failed to allocate %s\n", name);
148		return;
149	}
150
151	(*pdev)->dev.parent = pcf->dev;
152
153	ret = platform_device_add(*pdev);
154	if (ret) {
155		dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
156		platform_device_put(*pdev);
157		*pdev = NULL;
158	}
159}
160
161#ifdef CONFIG_PM_SLEEP
162static int pcf50633_suspend(struct device *dev)
163{
164	struct i2c_client *client = to_i2c_client(dev);
165	struct pcf50633 *pcf = i2c_get_clientdata(client);
166
167	return pcf50633_irq_suspend(pcf);
168}
169
170static int pcf50633_resume(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_resume(pcf);
176}
177#endif
178
179static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
180
181static const struct regmap_config pcf50633_regmap_config = {
182	.reg_bits = 8,
183	.val_bits = 8,
184};
185
186static int pcf50633_probe(struct i2c_client *client,
187				const struct i2c_device_id *ids)
188{
189	struct pcf50633 *pcf;
190	struct platform_device *pdev;
191	struct pcf50633_platform_data *pdata = dev_get_platdata(&client->dev);
192	int i, j, ret;
193	int version, variant;
194
195	if (!client->irq) {
196		dev_err(&client->dev, "Missing IRQ\n");
197		return -ENOENT;
198	}
199
200	pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL);
201	if (!pcf)
202		return -ENOMEM;
203
204	i2c_set_clientdata(client, pcf);
205	pcf->dev = &client->dev;
206	pcf->pdata = pdata;
207
208	mutex_init(&pcf->lock);
209
210	pcf->regmap = devm_regmap_init_i2c(client, &pcf50633_regmap_config);
211	if (IS_ERR(pcf->regmap)) {
212		ret = PTR_ERR(pcf->regmap);
213		dev_err(pcf->dev, "Failed to allocate register map: %d\n", ret);
214		return ret;
215	}
216
217	version = pcf50633_reg_read(pcf, 0);
218	variant = pcf50633_reg_read(pcf, 1);
219	if (version < 0 || variant < 0) {
220		dev_err(pcf->dev, "Unable to probe pcf50633\n");
221		ret = -ENODEV;
222		return ret;
223	}
224
225	dev_info(pcf->dev, "Probed device version %d variant %d\n",
226							version, variant);
227
228	pcf50633_irq_init(pcf, client->irq);
229
230	/* Create sub devices */
231	pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev);
232	pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev);
233	pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev);
234	pcf50633_client_dev_register(pcf, "pcf50633-adc", &pcf->adc_pdev);
235	pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_pdev);
236
237
238	for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
239		pdev = platform_device_alloc("pcf50633-regulator", i);
240		if (!pdev) {
241			ret = -ENOMEM;
242			goto err2;
243		}
244
245		pdev->dev.parent = pcf->dev;
246		ret = platform_device_add_data(pdev, &pdata->reg_init_data[i],
247					       sizeof(pdata->reg_init_data[i]));
248		if (ret)
249			goto err;
250
251		ret = platform_device_add(pdev);
252		if (ret)
253			goto err;
254
255		pcf->regulator_pdev[i] = pdev;
256	}
257
258	ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
259	if (ret)
260		dev_warn(pcf->dev, "error creating sysfs entries\n");
261
262	if (pdata->probe_done)
263		pdata->probe_done(pcf);
264
265	return 0;
266
267err:
268	platform_device_put(pdev);
269err2:
270	for (j = 0; j < i; j++)
271		platform_device_put(pcf->regulator_pdev[j]);
272
273	return ret;
274}
275
276static int pcf50633_remove(struct i2c_client *client)
277{
278	struct pcf50633 *pcf = i2c_get_clientdata(client);
279	int i;
280
281	sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
282	pcf50633_irq_free(pcf);
283
284	platform_device_unregister(pcf->input_pdev);
285	platform_device_unregister(pcf->rtc_pdev);
286	platform_device_unregister(pcf->mbc_pdev);
287	platform_device_unregister(pcf->adc_pdev);
288	platform_device_unregister(pcf->bl_pdev);
289
290	for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
291		platform_device_unregister(pcf->regulator_pdev[i]);
292
293	return 0;
294}
295
296static const struct i2c_device_id pcf50633_id_table[] = {
297	{"pcf50633", 0x73},
298	{/* end of list */}
299};
300MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
301
302static struct i2c_driver pcf50633_driver = {
303	.driver = {
304		.name	= "pcf50633",
305		.pm	= &pcf50633_pm,
306	},
307	.id_table = pcf50633_id_table,
308	.probe = pcf50633_probe,
309	.remove = pcf50633_remove,
310};
311
312static int __init pcf50633_init(void)
313{
314	return i2c_add_driver(&pcf50633_driver);
315}
316
317static void __exit pcf50633_exit(void)
318{
319	i2c_del_driver(&pcf50633_driver);
320}
321
322MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
323MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
324MODULE_LICENSE("GPL");
325
326subsys_initcall(pcf50633_init);
327module_exit(pcf50633_exit);
328