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.unmask_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 
189 	ddata->irqs = devm_kcalloc(&spi->dev,
190 				   pdata->num_irqs, sizeof(struct regmap_irq),
191 				   GFP_KERNEL);
192 	if (!ddata->irqs)
193 		return -ENOMEM;
194 
195 	ddata->irq_chip.irqs = ddata->irqs;
196 	for (i = 0; i < pdata->num_irqs; i++)
197 		ddata->irqs[i].mask = BIT(i);
198 
199 	ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
200 				       IRQF_ONESHOT, 0,
201 				       &ddata->irq_chip, &ddata->irq_data);
202 	if (ret) {
203 		dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
204 		return ret;
205 	}
206 
207 	ret = devm_of_platform_populate(&spi->dev);
208 	if (ret) {
209 		dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);
210 		return ret;
211 	}
212 
213 	device_init_wakeup(&spi->dev, true);
214 	return 0;
215 }
216 
sprd_pmic_suspend(struct device * dev)217 static int sprd_pmic_suspend(struct device *dev)
218 {
219 	struct sprd_pmic *ddata = dev_get_drvdata(dev);
220 
221 	if (device_may_wakeup(dev))
222 		enable_irq_wake(ddata->irq);
223 
224 	return 0;
225 }
226 
sprd_pmic_resume(struct device * dev)227 static int sprd_pmic_resume(struct device *dev)
228 {
229 	struct sprd_pmic *ddata = dev_get_drvdata(dev);
230 
231 	if (device_may_wakeup(dev))
232 		disable_irq_wake(ddata->irq);
233 
234 	return 0;
235 }
236 
237 static DEFINE_SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops,
238 				sprd_pmic_suspend, sprd_pmic_resume);
239 
240 static const struct of_device_id sprd_pmic_match[] = {
241 	{ .compatible = "sprd,sc2730", .data = &sc2730_data },
242 	{ .compatible = "sprd,sc2731", .data = &sc2731_data },
243 	{},
244 };
245 MODULE_DEVICE_TABLE(of, sprd_pmic_match);
246 
247 static const struct spi_device_id sprd_pmic_spi_ids[] = {
248 	{ .name = "sc2730", .driver_data = (unsigned long)&sc2730_data },
249 	{ .name = "sc2731", .driver_data = (unsigned long)&sc2731_data },
250 	{},
251 };
252 MODULE_DEVICE_TABLE(spi, sprd_pmic_spi_ids);
253 
254 static struct spi_driver sprd_pmic_driver = {
255 	.driver = {
256 		.name = "sc27xx-pmic",
257 		.of_match_table = sprd_pmic_match,
258 		.pm = pm_sleep_ptr(&sprd_pmic_pm_ops),
259 	},
260 	.probe = sprd_pmic_probe,
261 	.id_table = sprd_pmic_spi_ids,
262 };
263 
sprd_pmic_init(void)264 static int __init sprd_pmic_init(void)
265 {
266 	return spi_register_driver(&sprd_pmic_driver);
267 }
268 subsys_initcall(sprd_pmic_init);
269 
sprd_pmic_exit(void)270 static void __exit sprd_pmic_exit(void)
271 {
272 	spi_unregister_driver(&sprd_pmic_driver);
273 }
274 module_exit(sprd_pmic_exit);
275 
276 MODULE_LICENSE("GPL v2");
277 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
278 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
279