1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AS3711 PMIC MFC driver
4 *
5 * Copyright (C) 2012 Renesas Electronics Corporation
6 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
7 */
8
9 #include <linux/device.h>
10 #include <linux/err.h>
11 #include <linux/i2c.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/mfd/as3711.h>
15 #include <linux/mfd/core.h>
16 #include <linux/of.h>
17 #include <linux/regmap.h>
18 #include <linux/slab.h>
19
20 enum {
21 AS3711_REGULATOR,
22 AS3711_BACKLIGHT,
23 };
24
25 /*
26 * Ok to have it static: it is only used during probing and multiple I2C devices
27 * cannot be probed simultaneously. Just make sure to avoid stale data.
28 */
29 static struct mfd_cell as3711_subdevs[] = {
30 [AS3711_REGULATOR] = {.name = "as3711-regulator",},
31 [AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
32 };
33
as3711_volatile_reg(struct device * dev,unsigned int reg)34 static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
35 {
36 switch (reg) {
37 case AS3711_GPIO_SIGNAL_IN:
38 case AS3711_INTERRUPT_STATUS_1:
39 case AS3711_INTERRUPT_STATUS_2:
40 case AS3711_INTERRUPT_STATUS_3:
41 case AS3711_CHARGER_STATUS_1:
42 case AS3711_CHARGER_STATUS_2:
43 case AS3711_REG_STATUS:
44 return true;
45 }
46 return false;
47 }
48
as3711_precious_reg(struct device * dev,unsigned int reg)49 static bool as3711_precious_reg(struct device *dev, unsigned int reg)
50 {
51 switch (reg) {
52 case AS3711_INTERRUPT_STATUS_1:
53 case AS3711_INTERRUPT_STATUS_2:
54 case AS3711_INTERRUPT_STATUS_3:
55 return true;
56 }
57 return false;
58 }
59
as3711_readable_reg(struct device * dev,unsigned int reg)60 static bool as3711_readable_reg(struct device *dev, unsigned int reg)
61 {
62 switch (reg) {
63 case AS3711_SD_1_VOLTAGE:
64 case AS3711_SD_2_VOLTAGE:
65 case AS3711_SD_3_VOLTAGE:
66 case AS3711_SD_4_VOLTAGE:
67 case AS3711_LDO_1_VOLTAGE:
68 case AS3711_LDO_2_VOLTAGE:
69 case AS3711_LDO_3_VOLTAGE:
70 case AS3711_LDO_4_VOLTAGE:
71 case AS3711_LDO_5_VOLTAGE:
72 case AS3711_LDO_6_VOLTAGE:
73 case AS3711_LDO_7_VOLTAGE:
74 case AS3711_LDO_8_VOLTAGE:
75 case AS3711_SD_CONTROL:
76 case AS3711_GPIO_SIGNAL_OUT:
77 case AS3711_GPIO_SIGNAL_IN:
78 case AS3711_SD_CONTROL_1:
79 case AS3711_SD_CONTROL_2:
80 case AS3711_CURR_CONTROL:
81 case AS3711_CURR1_VALUE:
82 case AS3711_CURR2_VALUE:
83 case AS3711_CURR3_VALUE:
84 case AS3711_STEPUP_CONTROL_1:
85 case AS3711_STEPUP_CONTROL_2:
86 case AS3711_STEPUP_CONTROL_4:
87 case AS3711_STEPUP_CONTROL_5:
88 case AS3711_REG_STATUS:
89 case AS3711_INTERRUPT_STATUS_1:
90 case AS3711_INTERRUPT_STATUS_2:
91 case AS3711_INTERRUPT_STATUS_3:
92 case AS3711_CHARGER_STATUS_1:
93 case AS3711_CHARGER_STATUS_2:
94 case AS3711_ASIC_ID_1:
95 case AS3711_ASIC_ID_2:
96 return true;
97 }
98 return false;
99 }
100
101 static const struct regmap_config as3711_regmap_config = {
102 .reg_bits = 8,
103 .val_bits = 8,
104 .volatile_reg = as3711_volatile_reg,
105 .readable_reg = as3711_readable_reg,
106 .precious_reg = as3711_precious_reg,
107 .max_register = AS3711_MAX_REG,
108 .num_reg_defaults_raw = AS3711_NUM_REGS,
109 .cache_type = REGCACHE_MAPLE,
110 };
111
112 #ifdef CONFIG_OF
113 static const struct of_device_id as3711_of_match[] = {
114 {.compatible = "ams,as3711",},
115 {}
116 };
117 #endif
118
as3711_i2c_probe(struct i2c_client * client)119 static int as3711_i2c_probe(struct i2c_client *client)
120 {
121 struct as3711 *as3711;
122 struct as3711_platform_data *pdata;
123 unsigned int id1, id2;
124 int ret;
125
126 if (!client->dev.of_node) {
127 pdata = dev_get_platdata(&client->dev);
128 if (!pdata)
129 dev_dbg(&client->dev, "Platform data not found\n");
130 } else {
131 pdata = devm_kzalloc(&client->dev,
132 sizeof(*pdata), GFP_KERNEL);
133 if (!pdata)
134 return -ENOMEM;
135 }
136
137 as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
138 if (!as3711)
139 return -ENOMEM;
140
141 as3711->dev = &client->dev;
142 i2c_set_clientdata(client, as3711);
143
144 if (client->irq)
145 dev_notice(&client->dev, "IRQ not supported yet\n");
146
147 as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
148 if (IS_ERR(as3711->regmap)) {
149 ret = PTR_ERR(as3711->regmap);
150 dev_err(&client->dev,
151 "regmap initialization failed: %d\n", ret);
152 return ret;
153 }
154
155 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
156 if (!ret)
157 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
158 if (ret < 0) {
159 dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
160 return ret;
161 }
162 if (id1 != 0x8b)
163 return -ENODEV;
164 dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);
165
166 /*
167 * We can reuse as3711_subdevs[],
168 * it will be copied in mfd_add_devices()
169 */
170 if (pdata) {
171 as3711_subdevs[AS3711_REGULATOR].platform_data =
172 &pdata->regulator;
173 as3711_subdevs[AS3711_REGULATOR].pdata_size =
174 sizeof(pdata->regulator);
175 as3711_subdevs[AS3711_BACKLIGHT].platform_data =
176 &pdata->backlight;
177 as3711_subdevs[AS3711_BACKLIGHT].pdata_size =
178 sizeof(pdata->backlight);
179 } else {
180 as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
181 as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
182 as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
183 as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
184 }
185
186 ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,
187 ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
188 if (ret < 0)
189 dev_err(&client->dev, "add mfd devices failed: %d\n", ret);
190
191 return ret;
192 }
193
194 static const struct i2c_device_id as3711_i2c_id[] = {
195 {.name = "as3711", .driver_data = 0},
196 {}
197 };
198
199 static struct i2c_driver as3711_i2c_driver = {
200 .driver = {
201 .name = "as3711",
202 .of_match_table = of_match_ptr(as3711_of_match),
203 },
204 .probe = as3711_i2c_probe,
205 .id_table = as3711_i2c_id,
206 };
207
as3711_i2c_init(void)208 static int __init as3711_i2c_init(void)
209 {
210 return i2c_add_driver(&as3711_i2c_driver);
211 }
212 /* Initialise early */
213 subsys_initcall(as3711_i2c_init);
214