1/*
2 * AS3711 PMIC MFC driver
3 *
4 * Copyright (C) 2012 Renesas Electronics Corporation
5 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the version 2 of the GNU General Public License as
9 * published by the Free Software Foundation
10 */
11
12#include <linux/device.h>
13#include <linux/err.h>
14#include <linux/i2c.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/mfd/as3711.h>
18#include <linux/mfd/core.h>
19#include <linux/of.h>
20#include <linux/regmap.h>
21#include <linux/slab.h>
22
23enum {
24 AS3711_REGULATOR,
25 AS3711_BACKLIGHT,
26};
27
28/*
29 * Ok to have it static: it is only used during probing and multiple I2C devices
30 * cannot be probed simultaneously. Just make sure to avoid stale data.
31 */
32static struct mfd_cell as3711_subdevs[] = {
33 [AS3711_REGULATOR] = {.name = "as3711-regulator",},
34 [AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
35};
36
37static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
38{
39 switch (reg) {
40 case AS3711_GPIO_SIGNAL_IN:
41 case AS3711_INTERRUPT_STATUS_1:
42 case AS3711_INTERRUPT_STATUS_2:
43 case AS3711_INTERRUPT_STATUS_3:
44 case AS3711_CHARGER_STATUS_1:
45 case AS3711_CHARGER_STATUS_2:
46 case AS3711_REG_STATUS:
47 return true;
48 }
49 return false;
50}
51
52static bool as3711_precious_reg(struct device *dev, unsigned int reg)
53{
54 switch (reg) {
55 case AS3711_INTERRUPT_STATUS_1:
56 case AS3711_INTERRUPT_STATUS_2:
57 case AS3711_INTERRUPT_STATUS_3:
58 return true;
59 }
60 return false;
61}
62
63static bool as3711_readable_reg(struct device *dev, unsigned int reg)
64{
65 switch (reg) {
66 case AS3711_SD_1_VOLTAGE:
67 case AS3711_SD_2_VOLTAGE:
68 case AS3711_SD_3_VOLTAGE:
69 case AS3711_SD_4_VOLTAGE:
70 case AS3711_LDO_1_VOLTAGE:
71 case AS3711_LDO_2_VOLTAGE:
72 case AS3711_LDO_3_VOLTAGE:
73 case AS3711_LDO_4_VOLTAGE:
74 case AS3711_LDO_5_VOLTAGE:
75 case AS3711_LDO_6_VOLTAGE:
76 case AS3711_LDO_7_VOLTAGE:
77 case AS3711_LDO_8_VOLTAGE:
78 case AS3711_SD_CONTROL:
79 case AS3711_GPIO_SIGNAL_OUT:
80 case AS3711_GPIO_SIGNAL_IN:
81 case AS3711_SD_CONTROL_1:
82 case AS3711_SD_CONTROL_2:
83 case AS3711_CURR_CONTROL:
84 case AS3711_CURR1_VALUE:
85 case AS3711_CURR2_VALUE:
86 case AS3711_CURR3_VALUE:
87 case AS3711_STEPUP_CONTROL_1:
88 case AS3711_STEPUP_CONTROL_2:
89 case AS3711_STEPUP_CONTROL_4:
90 case AS3711_STEPUP_CONTROL_5:
91 case AS3711_REG_STATUS:
92 case AS3711_INTERRUPT_STATUS_1:
93 case AS3711_INTERRUPT_STATUS_2:
94 case AS3711_INTERRUPT_STATUS_3:
95 case AS3711_CHARGER_STATUS_1:
96 case AS3711_CHARGER_STATUS_2:
97 case AS3711_ASIC_ID_1:
98 case AS3711_ASIC_ID_2:
99 return true;
100 }
101 return false;
102}
103
104static const struct regmap_config as3711_regmap_config = {
105 .reg_bits = 8,
106 .val_bits = 8,
107 .volatile_reg = as3711_volatile_reg,
108 .readable_reg = as3711_readable_reg,
109 .precious_reg = as3711_precious_reg,
110 .max_register = AS3711_MAX_REG,
111 .num_reg_defaults_raw = AS3711_NUM_REGS,
112 .cache_type = REGCACHE_RBTREE,
113};
114
115#ifdef CONFIG_OF
116static const struct of_device_id as3711_of_match[] = {
117 {.compatible = "ams,as3711",},
118 {}
119};
120#endif
121
122static int as3711_i2c_probe(struct i2c_client *client,
123 const struct i2c_device_id *id)
124{
125 struct as3711 *as3711;
126 struct as3711_platform_data *pdata;
127 unsigned int id1, id2;
128 int ret;
129
130 if (!client->dev.of_node) {
131 pdata = dev_get_platdata(&client->dev);
132 if (!pdata)
133 dev_dbg(&client->dev, "Platform data not found\n");
134 } else {
135 pdata = devm_kzalloc(&client->dev,
136 sizeof(*pdata), GFP_KERNEL);
137 if (!pdata)
138 return -ENOMEM;
139 }
140
141 as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
142 if (!as3711)
143 return -ENOMEM;
144
145 as3711->dev = &client->dev;
146 i2c_set_clientdata(client, as3711);
147
148 if (client->irq)
149 dev_notice(&client->dev, "IRQ not supported yet\n");
150
151 as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
152 if (IS_ERR(as3711->regmap)) {
153 ret = PTR_ERR(as3711->regmap);
154 dev_err(&client->dev,
155 "regmap initialization failed: %d\n", ret);
156 return ret;
157 }
158
159 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
160 if (!ret)
161 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
162 if (ret < 0) {
163 dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
164 return ret;
165 }
166 if (id1 != 0x8b)
167 return -ENODEV;
168 dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);
169
170 /*
171 * We can reuse as3711_subdevs[],
172 * it will be copied in mfd_add_devices()
173 */
174 if (pdata) {
175 as3711_subdevs[AS3711_REGULATOR].platform_data =
176 &pdata->regulator;
177 as3711_subdevs[AS3711_REGULATOR].pdata_size =
178 sizeof(pdata->regulator);
179 as3711_subdevs[AS3711_BACKLIGHT].platform_data =
180 &pdata->backlight;
181 as3711_subdevs[AS3711_BACKLIGHT].pdata_size =
182 sizeof(pdata->backlight);
183 } else {
184 as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
185 as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
186 as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
187 as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
188 }
189
190 ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,
191 ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
192 if (ret < 0)
193 dev_err(&client->dev, "add mfd devices failed: %d\n", ret);
194
195 return ret;
196}
197
198static const struct i2c_device_id as3711_i2c_id[] = {
199 {.name = "as3711", .driver_data = 0},
200 {}
201};
202
203static struct i2c_driver as3711_i2c_driver = {
204 .driver = {
205 .name = "as3711",
206 .of_match_table = of_match_ptr(as3711_of_match),
207 },
208 .probe = as3711_i2c_probe,
209 .id_table = as3711_i2c_id,
210};
211
212static int __init as3711_i2c_init(void)
213{
214 return i2c_add_driver(&as3711_i2c_driver);
215}
216/* Initialise early */
217subsys_initcall(as3711_i2c_init);
218