GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / mfd / pcf50633-core.c
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  */
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  */
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
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
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
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
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 */
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
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
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
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
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
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
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
312 static int __init pcf50633_init(void)
313 {
314         return i2c_add_driver(&pcf50633_driver);
315 }
316
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);