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
sprd_pmic_detect_charger_type(struct device * dev)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
sprd_pmic_spi_write(void * context,const void * data,size_t count)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
sprd_pmic_spi_read(void * context,const void * reg,size_t reg_size,void * val,size_t val_size)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
sprd_pmic_probe(struct spi_device * spi)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
sprd_pmic_suspend(struct device * dev)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
sprd_pmic_resume(struct device * dev)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
sprd_pmic_init(void)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
sprd_pmic_exit(void)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>");
281