1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Rockchip RK808/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 rk808_is_volatile_reg(struct device *dev, unsigned int reg)
25{
26 /*
27 * Notes:
28 * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
29 * we don't use that feature. It's better to cache.
30 * - It's unlikely we care that RK808_DEVCTRL_REG is volatile since
31 * bits are cleared in case when we shutoff anyway, but better safe.
32 */
33
34 switch (reg) {
35 case RK808_SECONDS_REG ... RK808_WEEKS_REG:
36 case RK808_RTC_STATUS_REG:
37 case RK808_VB_MON_REG:
38 case RK808_THERMAL_REG:
39 case RK808_DCDC_UV_STS_REG:
40 case RK808_LDO_UV_STS_REG:
41 case RK808_DCDC_PG_REG:
42 case RK808_LDO_PG_REG:
43 case RK808_DEVCTRL_REG:
44 case RK808_INT_STS_REG1:
45 case RK808_INT_STS_REG2:
46 return true;
47 }
48
49 return false;
50}
51
52static bool rk817_is_volatile_reg(struct device *dev, unsigned int reg)
53{
54 /*
55 * Notes:
56 * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
57 * we don't use that feature. It's better to cache.
58 */
59
60 switch (reg) {
61 case RK817_SECONDS_REG ... RK817_WEEKS_REG:
62 case RK817_RTC_STATUS_REG:
63 case RK817_CODEC_DTOP_LPT_SRST:
64 case RK817_GAS_GAUGE_ADC_CONFIG0 ... RK817_GAS_GAUGE_CUR_ADC_K0:
65 case RK817_PMIC_CHRG_STS:
66 case RK817_PMIC_CHRG_OUT:
67 case RK817_PMIC_CHRG_IN:
68 case RK817_INT_STS_REG0:
69 case RK817_INT_STS_REG1:
70 case RK817_INT_STS_REG2:
71 case RK817_SYS_STS:
72 return true;
73 }
74
75 return false;
76}
77
78
79static const struct regmap_config rk818_regmap_config = {
80 .reg_bits = 8,
81 .val_bits = 8,
82 .max_register = RK818_USB_CTRL_REG,
83 .cache_type = REGCACHE_MAPLE,
84 .volatile_reg = rk808_is_volatile_reg,
85};
86
87static const struct regmap_config rk805_regmap_config = {
88 .reg_bits = 8,
89 .val_bits = 8,
90 .max_register = RK805_OFF_SOURCE_REG,
91 .cache_type = REGCACHE_MAPLE,
92 .volatile_reg = rk808_is_volatile_reg,
93};
94
95static const struct regmap_config rk808_regmap_config = {
96 .reg_bits = 8,
97 .val_bits = 8,
98 .max_register = RK808_IO_POL_REG,
99 .cache_type = REGCACHE_MAPLE,
100 .volatile_reg = rk808_is_volatile_reg,
101};
102
103static const struct regmap_config rk817_regmap_config = {
104 .reg_bits = 8,
105 .val_bits = 8,
106 .max_register = RK817_GPIO_INT_CFG,
107 .cache_type = REGCACHE_NONE,
108 .volatile_reg = rk817_is_volatile_reg,
109};
110
111static const struct rk8xx_i2c_platform_data rk805_data = {
112 .regmap_cfg = &rk805_regmap_config,
113 .variant = RK805_ID,
114};
115
116static const struct rk8xx_i2c_platform_data rk808_data = {
117 .regmap_cfg = &rk808_regmap_config,
118 .variant = RK808_ID,
119};
120
121static const struct rk8xx_i2c_platform_data rk809_data = {
122 .regmap_cfg = &rk817_regmap_config,
123 .variant = RK809_ID,
124};
125
126static const struct rk8xx_i2c_platform_data rk817_data = {
127 .regmap_cfg = &rk817_regmap_config,
128 .variant = RK817_ID,
129};
130
131static const struct rk8xx_i2c_platform_data rk818_data = {
132 .regmap_cfg = &rk818_regmap_config,
133 .variant = RK818_ID,
134};
135
136static int rk8xx_i2c_probe(struct i2c_client *client)
137{
138 const struct rk8xx_i2c_platform_data *data;
139 struct regmap *regmap;
140
141 data = device_get_match_data(dev: &client->dev);
142 if (!data)
143 return -ENODEV;
144
145 regmap = devm_regmap_init_i2c(client, data->regmap_cfg);
146 if (IS_ERR(ptr: regmap))
147 return dev_err_probe(dev: &client->dev, err: PTR_ERR(ptr: regmap),
148 fmt: "regmap initialization failed\n");
149
150 return rk8xx_probe(dev: &client->dev, variant: data->variant, irq: client->irq, regmap);
151}
152
153static void rk8xx_i2c_shutdown(struct i2c_client *client)
154{
155 rk8xx_shutdown(dev: &client->dev);
156}
157
158static SIMPLE_DEV_PM_OPS(rk8xx_i2c_pm_ops, rk8xx_suspend, rk8xx_resume);
159
160static const struct of_device_id rk8xx_i2c_of_match[] = {
161 { .compatible = "rockchip,rk805", .data = &rk805_data },
162 { .compatible = "rockchip,rk808", .data = &rk808_data },
163 { .compatible = "rockchip,rk809", .data = &rk809_data },
164 { .compatible = "rockchip,rk817", .data = &rk817_data },
165 { .compatible = "rockchip,rk818", .data = &rk818_data },
166 { },
167};
168MODULE_DEVICE_TABLE(of, rk8xx_i2c_of_match);
169
170static struct i2c_driver rk8xx_i2c_driver = {
171 .driver = {
172 .name = "rk8xx-i2c",
173 .of_match_table = rk8xx_i2c_of_match,
174 .pm = &rk8xx_i2c_pm_ops,
175 },
176 .probe = rk8xx_i2c_probe,
177 .shutdown = rk8xx_i2c_shutdown,
178};
179module_i2c_driver(rk8xx_i2c_driver);
180
181MODULE_LICENSE("GPL");
182MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
183MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
184MODULE_AUTHOR("Wadim Egorov <w.egorov@phytec.de>");
185MODULE_DESCRIPTION("RK8xx I2C PMIC driver");
186

source code of linux/drivers/mfd/rk8xx-i2c.c