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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_SC2731_IRQ_BASE 0x140
22#define SPRD_SC2731_IRQ_NUMS 16
23#define SPRD_SC2731_CHG_DET 0xedc
24
25
26#define SPRD_PMIC_CHG_DET_DELAY_US 200000
27#define SPRD_PMIC_CHG_DET_TIMEOUT 2000000
28#define SPRD_PMIC_CHG_DET_DONE BIT(11)
29#define SPRD_PMIC_SDP_TYPE BIT(7)
30#define SPRD_PMIC_DCP_TYPE BIT(6)
31#define SPRD_PMIC_CDP_TYPE BIT(5)
32#define SPRD_PMIC_CHG_TYPE_MASK GENMASK(7, 5)
33
34struct sprd_pmic {
35 struct regmap *regmap;
36 struct device *dev;
37 struct regmap_irq *irqs;
38 struct regmap_irq_chip irq_chip;
39 struct regmap_irq_chip_data *irq_data;
40 const struct sprd_pmic_data *pdata;
41 int irq;
42};
43
44struct sprd_pmic_data {
45 u32 irq_base;
46 u32 num_irqs;
47 u32 charger_det;
48};
49
50
51
52
53
54
55static const struct sprd_pmic_data sc2731_data = {
56 .irq_base = SPRD_SC2731_IRQ_BASE,
57 .num_irqs = SPRD_SC2731_IRQ_NUMS,
58 .charger_det = SPRD_SC2731_CHG_DET,
59};
60
61enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
62{
63 struct spi_device *spi = to_spi_device(dev);
64 struct sprd_pmic *ddata = spi_get_drvdata(spi);
65 const struct sprd_pmic_data *pdata = ddata->pdata;
66 enum usb_charger_type type;
67 u32 val;
68 int ret;
69
70 ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
71 (val & SPRD_PMIC_CHG_DET_DONE),
72 SPRD_PMIC_CHG_DET_DELAY_US,
73 SPRD_PMIC_CHG_DET_TIMEOUT);
74 if (ret) {
75 dev_err(&spi->dev, "failed to detect charger type\n");
76 return UNKNOWN_TYPE;
77 }
78
79 switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
80 case SPRD_PMIC_CDP_TYPE:
81 type = CDP_TYPE;
82 break;
83 case SPRD_PMIC_DCP_TYPE:
84 type = DCP_TYPE;
85 break;
86 case SPRD_PMIC_SDP_TYPE:
87 type = SDP_TYPE;
88 break;
89 default:
90 type = UNKNOWN_TYPE;
91 break;
92 }
93
94 return type;
95}
96EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
97
98static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
99{
100 struct device *dev = context;
101 struct spi_device *spi = to_spi_device(dev);
102
103 return spi_write(spi, data, count);
104}
105
106static int sprd_pmic_spi_read(void *context,
107 const void *reg, size_t reg_size,
108 void *val, size_t val_size)
109{
110 struct device *dev = context;
111 struct spi_device *spi = to_spi_device(dev);
112 u32 rx_buf[2] = { 0 };
113 int ret;
114
115
116 if (reg_size != sizeof(u32) || val_size != sizeof(u32))
117 return -EINVAL;
118
119
120 memcpy(rx_buf, reg, sizeof(u32));
121 ret = spi_read(spi, rx_buf, 1);
122 if (ret < 0)
123 return ret;
124
125 memcpy(val, rx_buf, val_size);
126 return 0;
127}
128
129static struct regmap_bus sprd_pmic_regmap = {
130 .write = sprd_pmic_spi_write,
131 .read = sprd_pmic_spi_read,
132 .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
133 .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
134};
135
136static const struct regmap_config sprd_pmic_config = {
137 .reg_bits = 32,
138 .val_bits = 32,
139 .reg_stride = 4,
140 .max_register = 0xffff,
141};
142
143static int sprd_pmic_probe(struct spi_device *spi)
144{
145 struct sprd_pmic *ddata;
146 const struct sprd_pmic_data *pdata;
147 int ret, i;
148
149 pdata = of_device_get_match_data(&spi->dev);
150 if (!pdata) {
151 dev_err(&spi->dev, "No matching driver data found\n");
152 return -EINVAL;
153 }
154
155 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
156 if (!ddata)
157 return -ENOMEM;
158
159 ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
160 &spi->dev, &sprd_pmic_config);
161 if (IS_ERR(ddata->regmap)) {
162 ret = PTR_ERR(ddata->regmap);
163 dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
164 return ret;
165 }
166
167 spi_set_drvdata(spi, ddata);
168 ddata->dev = &spi->dev;
169 ddata->irq = spi->irq;
170 ddata->pdata = pdata;
171
172 ddata->irq_chip.name = dev_name(&spi->dev);
173 ddata->irq_chip.status_base =
174 pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
175 ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
176 ddata->irq_chip.ack_base = 0;
177 ddata->irq_chip.num_regs = 1;
178 ddata->irq_chip.num_irqs = pdata->num_irqs;
179 ddata->irq_chip.mask_invert = true;
180
181 ddata->irqs = devm_kcalloc(&spi->dev,
182 pdata->num_irqs, sizeof(struct regmap_irq),
183 GFP_KERNEL);
184 if (!ddata->irqs)
185 return -ENOMEM;
186
187 ddata->irq_chip.irqs = ddata->irqs;
188 for (i = 0; i < pdata->num_irqs; i++)
189 ddata->irqs[i].mask = BIT(i);
190
191 ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
192 IRQF_ONESHOT, 0,
193 &ddata->irq_chip, &ddata->irq_data);
194 if (ret) {
195 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
196 return ret;
197 }
198
199 ret = devm_of_platform_populate(&spi->dev);
200 if (ret) {
201 dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);
202 return ret;
203 }
204
205 device_init_wakeup(&spi->dev, true);
206 return 0;
207}
208
209#ifdef CONFIG_PM_SLEEP
210static int sprd_pmic_suspend(struct device *dev)
211{
212 struct sprd_pmic *ddata = dev_get_drvdata(dev);
213
214 if (device_may_wakeup(dev))
215 enable_irq_wake(ddata->irq);
216
217 return 0;
218}
219
220static int sprd_pmic_resume(struct device *dev)
221{
222 struct sprd_pmic *ddata = dev_get_drvdata(dev);
223
224 if (device_may_wakeup(dev))
225 disable_irq_wake(ddata->irq);
226
227 return 0;
228}
229#endif
230
231static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);
232
233static const struct of_device_id sprd_pmic_match[] = {
234 { .compatible = "sprd,sc2731", .data = &sc2731_data },
235 {},
236};
237MODULE_DEVICE_TABLE(of, sprd_pmic_match);
238
239static struct spi_driver sprd_pmic_driver = {
240 .driver = {
241 .name = "sc27xx-pmic",
242 .of_match_table = sprd_pmic_match,
243 .pm = &sprd_pmic_pm_ops,
244 },
245 .probe = sprd_pmic_probe,
246};
247
248static int __init sprd_pmic_init(void)
249{
250 return spi_register_driver(&sprd_pmic_driver);
251}
252subsys_initcall(sprd_pmic_init);
253
254static void __exit sprd_pmic_exit(void)
255{
256 spi_unregister_driver(&sprd_pmic_driver);
257}
258module_exit(sprd_pmic_exit);
259
260MODULE_LICENSE("GPL v2");
261MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
262MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
263
