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 */
show_dump_regs(struct device * dev,struct device_attribute * attr,char * buf)80 static 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 }
109 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
110
show_resume_reason(struct device * dev,struct device_attribute * attr,char * buf)111 static 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 }
126 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
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 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
296 static const struct i2c_device_id pcf50633_id_table[] = {
297 {"pcf50633", 0x73},
298 {/* end of list */}
299 };
300 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
301
302 static 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
pcf50633_init(void)312 static int __init pcf50633_init(void)
313 {
314 return i2c_add_driver(&pcf50633_driver);
315 }
316
pcf50633_exit(void)317 static void __exit pcf50633_exit(void)
318 {
319 i2c_del_driver(&pcf50633_driver);
320 }
321
322 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
323 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
324 MODULE_LICENSE("GPL");
325
326 subsys_initcall(pcf50633_init);
327 module_exit(pcf50633_exit);
328
