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/of_device.h>
11 #include <linux/regmap.h>
12 #include <linux/spi/spi.h>
13 #include <uapi/linux/usb/charger.h>
14
15 #define SPRD_PMIC_INT_MASK_STATUS 0x0
16 #define SPRD_PMIC_INT_RAW_STATUS 0x4
17 #define SPRD_PMIC_INT_EN 0x8
18
19 #define SPRD_SC2731_IRQ_BASE 0x140
20 #define SPRD_SC2731_IRQ_NUMS 16
21 #define SPRD_SC2731_CHG_DET 0xedc
22
23 /* PMIC charger detection definition */
24 #define SPRD_PMIC_CHG_DET_DELAY_US 200000
25 #define SPRD_PMIC_CHG_DET_TIMEOUT 2000000
26 #define SPRD_PMIC_CHG_DET_DONE BIT(11)
27 #define SPRD_PMIC_SDP_TYPE BIT(7)
28 #define SPRD_PMIC_DCP_TYPE BIT(6)
29 #define SPRD_PMIC_CDP_TYPE BIT(5)
30 #define SPRD_PMIC_CHG_TYPE_MASK GENMASK(7, 5)
31
32 struct sprd_pmic {
33 struct regmap *regmap;
34 struct device *dev;
35 struct regmap_irq *irqs;
36 struct regmap_irq_chip irq_chip;
37 struct regmap_irq_chip_data *irq_data;
38 const struct sprd_pmic_data *pdata;
39 int irq;
40 };
41
42 struct sprd_pmic_data {
43 u32 irq_base;
44 u32 num_irqs;
45 u32 charger_det;
46 };
47
48 /*
49 * Since different PMICs of SC27xx series can have different interrupt
50 * base address and irq number, we should save irq number and irq base
51 * in the device data structure.
52 */
53 static const struct sprd_pmic_data sc2731_data = {
54 .irq_base = SPRD_SC2731_IRQ_BASE,
55 .num_irqs = SPRD_SC2731_IRQ_NUMS,
56 .charger_det = SPRD_SC2731_CHG_DET,
57 };
58
sprd_pmic_detect_charger_type(struct device * dev)59 enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
60 {
61 struct spi_device *spi = to_spi_device(dev);
62 struct sprd_pmic *ddata = spi_get_drvdata(spi);
63 const struct sprd_pmic_data *pdata = ddata->pdata;
64 enum usb_charger_type type;
65 u32 val;
66 int ret;
67
68 ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
69 (val & SPRD_PMIC_CHG_DET_DONE),
70 SPRD_PMIC_CHG_DET_DELAY_US,
71 SPRD_PMIC_CHG_DET_TIMEOUT);
72 if (ret) {
73 dev_err(&spi->dev, "failed to detect charger type\n");
74 return UNKNOWN_TYPE;
75 }
76
77 switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
78 case SPRD_PMIC_CDP_TYPE:
79 type = CDP_TYPE;
80 break;
81 case SPRD_PMIC_DCP_TYPE:
82 type = DCP_TYPE;
83 break;
84 case SPRD_PMIC_SDP_TYPE:
85 type = SDP_TYPE;
86 break;
87 default:
88 type = UNKNOWN_TYPE;
89 break;
90 }
91
92 return type;
93 }
94 EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
95
96 static const struct mfd_cell sprd_pmic_devs[] = {
97 {
98 .name = "sc27xx-wdt",
99 .of_compatible = "sprd,sc2731-wdt",
100 }, {
101 .name = "sc27xx-rtc",
102 .of_compatible = "sprd,sc2731-rtc",
103 }, {
104 .name = "sc27xx-charger",
105 .of_compatible = "sprd,sc2731-charger",
106 }, {
107 .name = "sc27xx-chg-timer",
108 .of_compatible = "sprd,sc2731-chg-timer",
109 }, {
110 .name = "sc27xx-fast-chg",
111 .of_compatible = "sprd,sc2731-fast-chg",
112 }, {
113 .name = "sc27xx-chg-wdt",
114 .of_compatible = "sprd,sc2731-chg-wdt",
115 }, {
116 .name = "sc27xx-typec",
117 .of_compatible = "sprd,sc2731-typec",
118 }, {
119 .name = "sc27xx-flash",
120 .of_compatible = "sprd,sc2731-flash",
121 }, {
122 .name = "sc27xx-eic",
123 .of_compatible = "sprd,sc2731-eic",
124 }, {
125 .name = "sc27xx-efuse",
126 .of_compatible = "sprd,sc2731-efuse",
127 }, {
128 .name = "sc27xx-thermal",
129 .of_compatible = "sprd,sc2731-thermal",
130 }, {
131 .name = "sc27xx-adc",
132 .of_compatible = "sprd,sc2731-adc",
133 }, {
134 .name = "sc27xx-audio-codec",
135 .of_compatible = "sprd,sc2731-audio-codec",
136 }, {
137 .name = "sc27xx-regulator",
138 .of_compatible = "sprd,sc2731-regulator",
139 }, {
140 .name = "sc27xx-vibrator",
141 .of_compatible = "sprd,sc2731-vibrator",
142 }, {
143 .name = "sc27xx-keypad-led",
144 .of_compatible = "sprd,sc2731-keypad-led",
145 }, {
146 .name = "sc27xx-bltc",
147 .of_compatible = "sprd,sc2731-bltc",
148 }, {
149 .name = "sc27xx-fgu",
150 .of_compatible = "sprd,sc2731-fgu",
151 }, {
152 .name = "sc27xx-7sreset",
153 .of_compatible = "sprd,sc2731-7sreset",
154 }, {
155 .name = "sc27xx-poweroff",
156 .of_compatible = "sprd,sc2731-poweroff",
157 }, {
158 .name = "sc27xx-syscon",
159 .of_compatible = "sprd,sc2731-syscon",
160 },
161 };
162
sprd_pmic_spi_write(void * context,const void * data,size_t count)163 static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
164 {
165 struct device *dev = context;
166 struct spi_device *spi = to_spi_device(dev);
167
168 return spi_write(spi, data, count);
169 }
170
sprd_pmic_spi_read(void * context,const void * reg,size_t reg_size,void * val,size_t val_size)171 static int sprd_pmic_spi_read(void *context,
172 const void *reg, size_t reg_size,
173 void *val, size_t val_size)
174 {
175 struct device *dev = context;
176 struct spi_device *spi = to_spi_device(dev);
177 u32 rx_buf[2] = { 0 };
178 int ret;
179
180 /* Now we only support one PMIC register to read every time. */
181 if (reg_size != sizeof(u32) || val_size != sizeof(u32))
182 return -EINVAL;
183
184 /* Copy address to read from into first element of SPI buffer. */
185 memcpy(rx_buf, reg, sizeof(u32));
186 ret = spi_read(spi, rx_buf, 1);
187 if (ret < 0)
188 return ret;
189
190 memcpy(val, rx_buf, val_size);
191 return 0;
192 }
193
194 static struct regmap_bus sprd_pmic_regmap = {
195 .write = sprd_pmic_spi_write,
196 .read = sprd_pmic_spi_read,
197 .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
198 .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
199 };
200
201 static const struct regmap_config sprd_pmic_config = {
202 .reg_bits = 32,
203 .val_bits = 32,
204 .reg_stride = 4,
205 .max_register = 0xffff,
206 };
207
sprd_pmic_probe(struct spi_device * spi)208 static int sprd_pmic_probe(struct spi_device *spi)
209 {
210 struct sprd_pmic *ddata;
211 const struct sprd_pmic_data *pdata;
212 int ret, i;
213
214 pdata = of_device_get_match_data(&spi->dev);
215 if (!pdata) {
216 dev_err(&spi->dev, "No matching driver data found\n");
217 return -EINVAL;
218 }
219
220 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
221 if (!ddata)
222 return -ENOMEM;
223
224 ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
225 &spi->dev, &sprd_pmic_config);
226 if (IS_ERR(ddata->regmap)) {
227 ret = PTR_ERR(ddata->regmap);
228 dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
229 return ret;
230 }
231
232 spi_set_drvdata(spi, ddata);
233 ddata->dev = &spi->dev;
234 ddata->irq = spi->irq;
235 ddata->pdata = pdata;
236
237 ddata->irq_chip.name = dev_name(&spi->dev);
238 ddata->irq_chip.status_base =
239 pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
240 ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
241 ddata->irq_chip.ack_base = 0;
242 ddata->irq_chip.num_regs = 1;
243 ddata->irq_chip.num_irqs = pdata->num_irqs;
244 ddata->irq_chip.mask_invert = true;
245
246 ddata->irqs = devm_kcalloc(&spi->dev,
247 pdata->num_irqs, sizeof(struct regmap_irq),
248 GFP_KERNEL);
249 if (!ddata->irqs)
250 return -ENOMEM;
251
252 ddata->irq_chip.irqs = ddata->irqs;
253 for (i = 0; i < pdata->num_irqs; i++) {
254 ddata->irqs[i].reg_offset = i / pdata->num_irqs;
255 ddata->irqs[i].mask = BIT(i % pdata->num_irqs);
256 }
257
258 ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
259 IRQF_ONESHOT, 0,
260 &ddata->irq_chip, &ddata->irq_data);
261 if (ret) {
262 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
263 return ret;
264 }
265
266 ret = devm_mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO,
267 sprd_pmic_devs, ARRAY_SIZE(sprd_pmic_devs),
268 NULL, 0,
269 regmap_irq_get_domain(ddata->irq_data));
270 if (ret) {
271 dev_err(&spi->dev, "Failed to register device %d\n", ret);
272 return ret;
273 }
274
275 device_init_wakeup(&spi->dev, true);
276 return 0;
277 }
278
279 #ifdef CONFIG_PM_SLEEP
sprd_pmic_suspend(struct device * dev)280 static int sprd_pmic_suspend(struct device *dev)
281 {
282 struct sprd_pmic *ddata = dev_get_drvdata(dev);
283
284 if (device_may_wakeup(dev))
285 enable_irq_wake(ddata->irq);
286
287 return 0;
288 }
289
sprd_pmic_resume(struct device * dev)290 static int sprd_pmic_resume(struct device *dev)
291 {
292 struct sprd_pmic *ddata = dev_get_drvdata(dev);
293
294 if (device_may_wakeup(dev))
295 disable_irq_wake(ddata->irq);
296
297 return 0;
298 }
299 #endif
300
301 static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);
302
303 static const struct of_device_id sprd_pmic_match[] = {
304 { .compatible = "sprd,sc2731", .data = &sc2731_data },
305 {},
306 };
307 MODULE_DEVICE_TABLE(of, sprd_pmic_match);
308
309 static struct spi_driver sprd_pmic_driver = {
310 .driver = {
311 .name = "sc27xx-pmic",
312 .bus = &spi_bus_type,
313 .of_match_table = sprd_pmic_match,
314 .pm = &sprd_pmic_pm_ops,
315 },
316 .probe = sprd_pmic_probe,
317 };
318
sprd_pmic_init(void)319 static int __init sprd_pmic_init(void)
320 {
321 return spi_register_driver(&sprd_pmic_driver);
322 }
323 subsys_initcall(sprd_pmic_init);
324
sprd_pmic_exit(void)325 static void __exit sprd_pmic_exit(void)
326 {
327 spi_unregister_driver(&sprd_pmic_driver);
328 }
329 module_exit(sprd_pmic_exit);
330
331 MODULE_LICENSE("GPL v2");
332 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
333 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
334