GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / sprd-sc27xx-spi.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2017 Spreadtrum Communications Inc.
4  */
5
6 #include <linux/interrupt.h>
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/mfd/core.h>
10 #include <linux/mfd/sc27xx-pmic.h>
11 #include <linux/of_device.h>
12 #include <linux/of_platform.h>
13 #include <linux/regmap.h>
14 #include <linux/spi/spi.h>
15 #include <uapi/linux/usb/charger.h>
16
17 #define SPRD_PMIC_INT_MASK_STATUS       0x0
18 #define SPRD_PMIC_INT_RAW_STATUS        0x4
19 #define SPRD_PMIC_INT_EN                0x8
20
21 #define SPRD_SC2730_IRQ_BASE            0x80
22 #define SPRD_SC2730_IRQ_NUMS            10
23 #define SPRD_SC2730_CHG_DET             0x1b9c
24 #define SPRD_SC2731_IRQ_BASE            0x140
25 #define SPRD_SC2731_IRQ_NUMS            16
26 #define SPRD_SC2731_CHG_DET             0xedc
27
28 /* PMIC charger detection definition */
29 #define SPRD_PMIC_CHG_DET_DELAY_US      200000
30 #define SPRD_PMIC_CHG_DET_TIMEOUT       2000000
31 #define SPRD_PMIC_CHG_DET_DONE          BIT(11)
32 #define SPRD_PMIC_SDP_TYPE              BIT(7)
33 #define SPRD_PMIC_DCP_TYPE              BIT(6)
34 #define SPRD_PMIC_CDP_TYPE              BIT(5)
35 #define SPRD_PMIC_CHG_TYPE_MASK         GENMASK(7, 5)
36
37 struct sprd_pmic {
38         struct regmap *regmap;
39         struct device *dev;
40         struct regmap_irq *irqs;
41         struct regmap_irq_chip irq_chip;
42         struct regmap_irq_chip_data *irq_data;
43         const struct sprd_pmic_data *pdata;
44         int irq;
45 };
46
47 struct sprd_pmic_data {
48         u32 irq_base;
49         u32 num_irqs;
50         u32 charger_det;
51 };
52
53 /*
54  * Since different PMICs of SC27xx series can have different interrupt
55  * base address and irq number, we should save irq number and irq base
56  * in the device data structure.
57  */
58 static const struct sprd_pmic_data sc2730_data = {
59         .irq_base = SPRD_SC2730_IRQ_BASE,
60         .num_irqs = SPRD_SC2730_IRQ_NUMS,
61         .charger_det = SPRD_SC2730_CHG_DET,
62 };
63
64 static const struct sprd_pmic_data sc2731_data = {
65         .irq_base = SPRD_SC2731_IRQ_BASE,
66         .num_irqs = SPRD_SC2731_IRQ_NUMS,
67         .charger_det = SPRD_SC2731_CHG_DET,
68 };
69
70 enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
71 {
72         struct spi_device *spi = to_spi_device(dev);
73         struct sprd_pmic *ddata = spi_get_drvdata(spi);
74         const struct sprd_pmic_data *pdata = ddata->pdata;
75         enum usb_charger_type type;
76         u32 val;
77         int ret;
78
79         ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
80                                        (val & SPRD_PMIC_CHG_DET_DONE),
81                                        SPRD_PMIC_CHG_DET_DELAY_US,
82                                        SPRD_PMIC_CHG_DET_TIMEOUT);
83         if (ret) {
84                 dev_err(&spi->dev, "failed to detect charger type\n");
85                 return UNKNOWN_TYPE;
86         }
87
88         switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
89         case SPRD_PMIC_CDP_TYPE:
90                 type = CDP_TYPE;
91                 break;
92         case SPRD_PMIC_DCP_TYPE:
93                 type = DCP_TYPE;
94                 break;
95         case SPRD_PMIC_SDP_TYPE:
96                 type = SDP_TYPE;
97                 break;
98         default:
99                 type = UNKNOWN_TYPE;
100                 break;
101         }
102
103         return type;
104 }
105 EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
106
107 static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
108 {
109         struct device *dev = context;
110         struct spi_device *spi = to_spi_device(dev);
111
112         return spi_write(spi, data, count);
113 }
114
115 static int sprd_pmic_spi_read(void *context,
116                               const void *reg, size_t reg_size,
117                               void *val, size_t val_size)
118 {
119         struct device *dev = context;
120         struct spi_device *spi = to_spi_device(dev);
121         u32 rx_buf[2] = { 0 };
122         int ret;
123
124         /* Now we only support one PMIC register to read every time. */
125         if (reg_size != sizeof(u32) || val_size != sizeof(u32))
126                 return -EINVAL;
127
128         /* Copy address to read from into first element of SPI buffer. */
129         memcpy(rx_buf, reg, sizeof(u32));
130         ret = spi_read(spi, rx_buf, 1);
131         if (ret < 0)
132                 return ret;
133
134         memcpy(val, rx_buf, val_size);
135         return 0;
136 }
137
138 static struct regmap_bus sprd_pmic_regmap = {
139         .write = sprd_pmic_spi_write,
140         .read = sprd_pmic_spi_read,
141         .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
142         .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
143 };
144
145 static const struct regmap_config sprd_pmic_config = {
146         .reg_bits = 32,
147         .val_bits = 32,
148         .reg_stride = 4,
149         .max_register = 0xffff,
150 };
151
152 static int sprd_pmic_probe(struct spi_device *spi)
153 {
154         struct sprd_pmic *ddata;
155         const struct sprd_pmic_data *pdata;
156         int ret, i;
157
158         pdata = of_device_get_match_data(&spi->dev);
159         if (!pdata) {
160                 dev_err(&spi->dev, "No matching driver data found\n");
161                 return -EINVAL;
162         }
163
164         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
165         if (!ddata)
166                 return -ENOMEM;
167
168         ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
169                                          &spi->dev, &sprd_pmic_config);
170         if (IS_ERR(ddata->regmap)) {
171                 ret = PTR_ERR(ddata->regmap);
172                 dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
173                 return ret;
174         }
175
176         spi_set_drvdata(spi, ddata);
177         ddata->dev = &spi->dev;
178         ddata->irq = spi->irq;
179         ddata->pdata = pdata;
180
181         ddata->irq_chip.name = dev_name(&spi->dev);
182         ddata->irq_chip.status_base =
183                 pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
184         ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
185         ddata->irq_chip.ack_base = 0;
186         ddata->irq_chip.num_regs = 1;
187         ddata->irq_chip.num_irqs = pdata->num_irqs;
188         ddata->irq_chip.mask_invert = true;
189
190         ddata->irqs = devm_kcalloc(&spi->dev,
191                                    pdata->num_irqs, sizeof(struct regmap_irq),
192                                    GFP_KERNEL);
193         if (!ddata->irqs)
194                 return -ENOMEM;
195
196         ddata->irq_chip.irqs = ddata->irqs;
197         for (i = 0; i < pdata->num_irqs; i++)
198                 ddata->irqs[i].mask = BIT(i);
199
200         ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
201                                        IRQF_ONESHOT, 0,
202                                        &ddata->irq_chip, &ddata->irq_data);
203         if (ret) {
204                 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
205                 return ret;
206         }
207
208         ret = devm_of_platform_populate(&spi->dev);
209         if (ret) {
210                 dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);
211                 return ret;
212         }
213
214         device_init_wakeup(&spi->dev, true);
215         return 0;
216 }
217
218 #ifdef CONFIG_PM_SLEEP
219 static int sprd_pmic_suspend(struct device *dev)
220 {
221         struct sprd_pmic *ddata = dev_get_drvdata(dev);
222
223         if (device_may_wakeup(dev))
224                 enable_irq_wake(ddata->irq);
225
226         return 0;
227 }
228
229 static int sprd_pmic_resume(struct device *dev)
230 {
231         struct sprd_pmic *ddata = dev_get_drvdata(dev);
232
233         if (device_may_wakeup(dev))
234                 disable_irq_wake(ddata->irq);
235
236         return 0;
237 }
238 #endif
239
240 static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);
241
242 static const struct of_device_id sprd_pmic_match[] = {
243         { .compatible = "sprd,sc2730", .data = &sc2730_data },
244         { .compatible = "sprd,sc2731", .data = &sc2731_data },
245         {},
246 };
247 MODULE_DEVICE_TABLE(of, sprd_pmic_match);
248
249 static const struct spi_device_id sprd_pmic_spi_ids[] = {
250         { .name = "sc2730", .driver_data = (unsigned long)&sc2730_data },
251         { .name = "sc2731", .driver_data = (unsigned long)&sc2731_data },
252         {},
253 };
254 MODULE_DEVICE_TABLE(spi, sprd_pmic_spi_ids);
255
256 static struct spi_driver sprd_pmic_driver = {
257         .driver = {
258                 .name = "sc27xx-pmic",
259                 .of_match_table = sprd_pmic_match,
260                 .pm = &sprd_pmic_pm_ops,
261         },
262         .probe = sprd_pmic_probe,
263         .id_table = sprd_pmic_spi_ids,
264 };
265
266 static int __init sprd_pmic_init(void)
267 {
268         return spi_register_driver(&sprd_pmic_driver);
269 }
270 subsys_initcall(sprd_pmic_init);
271
272 static void __exit sprd_pmic_exit(void)
273 {
274         spi_unregister_driver(&sprd_pmic_driver);
275 }
276 module_exit(sprd_pmic_exit);
277
278 MODULE_LICENSE("GPL v2");
279 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
280 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");