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  */
pcf50633_read_block(struct pcf50633 * pcf,u8 reg,int nr_regs,u8 * data)27 int 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 }
38 EXPORT_SYMBOL_GPL(pcf50633_read_block);
39 
40 /* Write a block of up to 32 regs  */
pcf50633_write_block(struct pcf50633 * pcf,u8 reg,int nr_regs,u8 * data)41 int 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 }
46 EXPORT_SYMBOL_GPL(pcf50633_write_block);
47 
pcf50633_reg_read(struct pcf50633 * pcf,u8 reg)48 u8 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 }
59 EXPORT_SYMBOL_GPL(pcf50633_reg_read);
60 
pcf50633_reg_write(struct pcf50633 * pcf,u8 reg,u8 val)61 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
62 {
63 	return regmap_write(pcf->regmap, reg, val);
64 }
65 EXPORT_SYMBOL_GPL(pcf50633_reg_write);
66 
pcf50633_reg_set_bit_mask(struct pcf50633 * pcf,u8 reg,u8 mask,u8 val)67 int 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 }
71 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
72 
pcf50633_reg_clear_bits(struct pcf50633 * pcf,u8 reg,u8 val)73 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
74 {
75 	return regmap_update_bits(pcf->regmap, reg, val, 0);
76 }
77 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
78 
79 /* sysfs attributes */
dump_regs_show(struct device * dev,struct device_attribute * attr,char * buf)80 static ssize_t dump_regs_show(struct device *dev,
81 			      struct device_attribute *attr, 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 }
109 static DEVICE_ATTR_ADMIN_RO(dump_regs);
110 
resume_reason_show(struct device * dev,struct device_attribute * attr,char * buf)111 static ssize_t resume_reason_show(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 }
126 static DEVICE_ATTR_ADMIN_RO(resume_reason);
127 
128 static struct attribute *pcf_sysfs_entries[] = {
129 	&dev_attr_dump_regs.attr,
130 	&dev_attr_resume_reason.attr,
131 	NULL,
132 };
133 
134 static struct attribute_group pcf_attr_group = {
135 	.name	= NULL,			/* put in device directory */
136 	.attrs	= pcf_sysfs_entries,
137 };
138 
139 static void
pcf50633_client_dev_register(struct pcf50633 * pcf,const char * name,struct platform_device ** pdev)140 pcf50633_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
pcf50633_suspend(struct device * dev)162 static 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 
pcf50633_resume(struct device * dev)170 static 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 
179 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
180 
181 static const struct regmap_config pcf50633_regmap_config = {
182 	.reg_bits = 8,
183 	.val_bits = 8,
184 };
185 
pcf50633_probe(struct i2c_client * client,const struct i2c_device_id * ids)186 static 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 
267 err:
268 	platform_device_put(pdev);
269 err2:
270 	for (j = 0; j < i; j++)
271 		platform_device_put(pcf->regulator_pdev[j]);
272 
273 	return ret;
274 }
275 
pcf50633_remove(struct i2c_client * client)276 static void 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 
294 static const struct i2c_device_id pcf50633_id_table[] = {
295 	{"pcf50633", 0x73},
296 	{/* end of list */}
297 };
298 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
299 
300 static struct i2c_driver pcf50633_driver = {
301 	.driver = {
302 		.name	= "pcf50633",
303 		.pm	= &pcf50633_pm,
304 	},
305 	.id_table = pcf50633_id_table,
306 	.probe = pcf50633_probe,
307 	.remove = pcf50633_remove,
308 };
309 
pcf50633_init(void)310 static int __init pcf50633_init(void)
311 {
312 	return i2c_add_driver(&pcf50633_driver);
313 }
314 
pcf50633_exit(void)315 static void __exit pcf50633_exit(void)
316 {
317 	i2c_del_driver(&pcf50633_driver);
318 }
319 
320 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
321 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
322 MODULE_LICENSE("GPL");
323 
324 subsys_initcall(pcf50633_init);
325 module_exit(pcf50633_exit);
326