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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Rockchip RK805/RK808/RK816/RK817/RK818 Core (I2C) driver
4 *
5 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
6 * Copyright (C) 2016 PHYTEC Messtechnik GmbH
7 *
8 * Author: Chris Zhong <zyw@rock-chips.com>
9 * Author: Zhang Qing <zhangqing@rock-chips.com>
10 * Author: Wadim Egorov <w.egorov@phytec.de>
11 */
12
13#include <linux/i2c.h>
14#include <linux/mfd/rk808.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/regmap.h>
18
19struct rk8xx_i2c_platform_data {
20 const struct regmap_config *regmap_cfg;
21 int variant;
22};
23
24static bool rk806_is_volatile_reg(struct device *dev, unsigned int reg)
25{
26 switch (reg) {
27 case RK806_POWER_EN0 ... RK806_POWER_EN5:
28 case RK806_DVS_START_CTRL ... RK806_INT_MSK1:
29 return true;
30 }
31
32 return false;
33}
34
35static bool rk808_is_volatile_reg(struct device *dev, unsigned int reg)
36{
37 /*
38 * Notes:
39 * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
40 * we don't use that feature. It's better to cache.
41 * - It's unlikely we care that RK808_DEVCTRL_REG is volatile since
42 * bits are cleared in case when we shutoff anyway, but better safe.
43 */
44
45 switch (reg) {
46 case RK808_SECONDS_REG ... RK808_WEEKS_REG:
47 case RK808_RTC_STATUS_REG:
48 case RK808_VB_MON_REG:
49 case RK808_THERMAL_REG:
50 case RK808_DCDC_UV_STS_REG:
51 case RK808_LDO_UV_STS_REG:
52 case RK808_DCDC_PG_REG:
53 case RK808_LDO_PG_REG:
54 case RK808_DEVCTRL_REG:
55 case RK808_INT_STS_REG1:
56 case RK808_INT_STS_REG2:
57 return true;
58 }
59
60 return false;
61}
62
63static bool rk816_is_volatile_reg(struct device *dev, unsigned int reg)
64{
65 /*
66 * Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
67 * we don't use that feature. It's better to cache.
68 */
69
70 switch (reg) {
71 case RK808_SECONDS_REG ... RK808_WEEKS_REG:
72 case RK808_RTC_STATUS_REG:
73 case RK808_VB_MON_REG:
74 case RK808_THERMAL_REG:
75 case RK816_DCDC_EN_REG1:
76 case RK816_DCDC_EN_REG2:
77 case RK816_INT_STS_REG1:
78 case RK816_INT_STS_REG2:
79 case RK816_INT_STS_REG3:
80 case RK808_DEVCTRL_REG:
81 case RK816_SUP_STS_REG:
82 case RK816_GGSTS_REG:
83 case RK816_ZERO_CUR_ADC_REGH:
84 case RK816_ZERO_CUR_ADC_REGL:
85 case RK816_GASCNT_REG(0) ... RK816_BAT_VOL_REGL:
86 return true;
87 }
88
89 return false;
90}
91
92static bool rk817_is_volatile_reg(struct device *dev, unsigned int reg)
93{
94 /*
95 * Notes:
96 * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
97 * we don't use that feature. It's better to cache.
98 */
99
100 switch (reg) {
101 case RK817_SECONDS_REG ... RK817_WEEKS_REG:
102 case RK817_RTC_STATUS_REG:
103 case RK817_CODEC_DTOP_LPT_SRST:
104 case RK817_GAS_GAUGE_ADC_CONFIG0 ... RK817_GAS_GAUGE_CUR_ADC_K0:
105 case RK817_PMIC_CHRG_STS:
106 case RK817_PMIC_CHRG_OUT:
107 case RK817_PMIC_CHRG_IN:
108 case RK817_INT_STS_REG0:
109 case RK817_INT_STS_REG1:
110 case RK817_INT_STS_REG2:
111 case RK817_SYS_STS:
112 return true;
113 }
114
115 return false;
116}
117
118
119static const struct regmap_config rk818_regmap_config = {
120 .reg_bits = 8,
121 .val_bits = 8,
122 .max_register = RK818_USB_CTRL_REG,
123 .cache_type = REGCACHE_MAPLE,
124 .volatile_reg = rk808_is_volatile_reg,
125};
126
127static const struct regmap_config rk805_regmap_config = {
128 .reg_bits = 8,
129 .val_bits = 8,
130 .max_register = RK805_OFF_SOURCE_REG,
131 .cache_type = REGCACHE_MAPLE,
132 .volatile_reg = rk808_is_volatile_reg,
133};
134
135static const struct regmap_config rk806_regmap_config = {
136 .reg_bits = 8,
137 .val_bits = 8,
138 .max_register = RK806_BUCK_RSERVE_REG5,
139 .cache_type = REGCACHE_MAPLE,
140 .volatile_reg = rk806_is_volatile_reg,
141};
142
143static const struct regmap_config rk808_regmap_config = {
144 .reg_bits = 8,
145 .val_bits = 8,
146 .max_register = RK808_IO_POL_REG,
147 .cache_type = REGCACHE_MAPLE,
148 .volatile_reg = rk808_is_volatile_reg,
149};
150
151static const struct regmap_config rk816_regmap_config = {
152 .reg_bits = 8,
153 .val_bits = 8,
154 .max_register = RK816_DATA_REG(18),
155 .cache_type = REGCACHE_MAPLE,
156 .volatile_reg = rk816_is_volatile_reg,
157};
158
159static const struct regmap_config rk817_regmap_config = {
160 .reg_bits = 8,
161 .val_bits = 8,
162 .max_register = RK817_GPIO_INT_CFG,
163 .cache_type = REGCACHE_NONE,
164 .volatile_reg = rk817_is_volatile_reg,
165};
166
167static const struct rk8xx_i2c_platform_data rk805_data = {
168 .regmap_cfg = &rk805_regmap_config,
169 .variant = RK805_ID,
170};
171
172static const struct rk8xx_i2c_platform_data rk806_data = {
173 .regmap_cfg = &rk806_regmap_config,
174 .variant = RK806_ID,
175};
176
177static const struct rk8xx_i2c_platform_data rk808_data = {
178 .regmap_cfg = &rk808_regmap_config,
179 .variant = RK808_ID,
180};
181
182static const struct rk8xx_i2c_platform_data rk809_data = {
183 .regmap_cfg = &rk817_regmap_config,
184 .variant = RK809_ID,
185};
186
187static const struct rk8xx_i2c_platform_data rk816_data = {
188 .regmap_cfg = &rk816_regmap_config,
189 .variant = RK816_ID,
190};
191
192static const struct rk8xx_i2c_platform_data rk817_data = {
193 .regmap_cfg = &rk817_regmap_config,
194 .variant = RK817_ID,
195};
196
197static const struct rk8xx_i2c_platform_data rk818_data = {
198 .regmap_cfg = &rk818_regmap_config,
199 .variant = RK818_ID,
200};
201
202static int rk8xx_i2c_probe(struct i2c_client *client)
203{
204 const struct rk8xx_i2c_platform_data *data;
205 struct regmap *regmap;
206
207 data = device_get_match_data(&client->dev);
208 if (!data)
209 return -ENODEV;
210
211 regmap = devm_regmap_init_i2c(client, data->regmap_cfg);
212 if (IS_ERR(regmap))
213 return dev_err_probe(&client->dev, PTR_ERR(regmap),
214 "regmap initialization failed\n");
215
216 return rk8xx_probe(&client->dev, data->variant, client->irq, regmap);
217}
218
219static void rk8xx_i2c_shutdown(struct i2c_client *client)
220{
221 rk8xx_shutdown(&client->dev);
222}
223
224static SIMPLE_DEV_PM_OPS(rk8xx_i2c_pm_ops, rk8xx_suspend, rk8xx_resume);
225
226static const struct of_device_id rk8xx_i2c_of_match[] = {
227 { .compatible = "rockchip,rk805", .data = &rk805_data },
228 { .compatible = "rockchip,rk806", .data = &rk806_data },
229 { .compatible = "rockchip,rk808", .data = &rk808_data },
230 { .compatible = "rockchip,rk809", .data = &rk809_data },
231 { .compatible = "rockchip,rk816", .data = &rk816_data },
232 { .compatible = "rockchip,rk817", .data = &rk817_data },
233 { .compatible = "rockchip,rk818", .data = &rk818_data },
234 { },
235};
236MODULE_DEVICE_TABLE(of, rk8xx_i2c_of_match);
237
238static struct i2c_driver rk8xx_i2c_driver = {
239 .driver = {
240 .name = "rk8xx-i2c",
241 .of_match_table = rk8xx_i2c_of_match,
242 .pm = &rk8xx_i2c_pm_ops,
243 },
244 .probe = rk8xx_i2c_probe,
245 .shutdown = rk8xx_i2c_shutdown,
246};
247module_i2c_driver(rk8xx_i2c_driver);
248
249MODULE_LICENSE("GPL");
250MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
251MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
252MODULE_AUTHOR("Wadim Egorov <w.egorov@phytec.de>");
253MODULE_DESCRIPTION("RK8xx I2C PMIC driver");