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_SC2731_IRQ_BASE 0x140
22 #define SPRD_SC2731_IRQ_NUMS 16
23 #define SPRD_SC2731_CHG_DET 0xedc
24
25 /* PMIC charger detection definition */
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
34 struct 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
44 struct sprd_pmic_data {
45 u32 irq_base;
46 u32 num_irqs;
47 u32 charger_det;
48 };
49
50 /*
51 * Since different PMICs of SC27xx series can have different interrupt
52 * base address and irq number, we should save irq number and irq base
53 * in the device data structure.
54 */
55 static 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
sprd_pmic_detect_charger_type(struct device * dev)61 enum 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 }
96 EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
97
sprd_pmic_spi_write(void * context,const void * data,size_t count)98 static 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
sprd_pmic_spi_read(void * context,const void * reg,size_t reg_size,void * val,size_t val_size)106 static 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 /* Now we only support one PMIC register to read every time. */
116 if (reg_size != sizeof(u32) || val_size != sizeof(u32))
117 return -EINVAL;
118
119 /* Copy address to read from into first element of SPI buffer. */
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
129 static 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
136 static 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
sprd_pmic_probe(struct spi_device * spi)143 static 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
sprd_pmic_suspend(struct device * dev)210 static 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
sprd_pmic_resume(struct device * dev)220 static 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
231 static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);
232
233 static const struct of_device_id sprd_pmic_match[] = {
234 { .compatible = "sprd,sc2731", .data = &sc2731_data },
235 {},
236 };
237 MODULE_DEVICE_TABLE(of, sprd_pmic_match);
238
239 static 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
sprd_pmic_init(void)248 static int __init sprd_pmic_init(void)
249 {
250 return spi_register_driver(&sprd_pmic_driver);
251 }
252 subsys_initcall(sprd_pmic_init);
253
sprd_pmic_exit(void)254 static void __exit sprd_pmic_exit(void)
255 {
256 spi_unregister_driver(&sprd_pmic_driver);
257 }
258 module_exit(sprd_pmic_exit);
259
260 MODULE_LICENSE("GPL v2");
261 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
262 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
263
