1aecd8454SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2acad189bSGuennadi Liakhovetski /*
3acad189bSGuennadi Liakhovetski * AS3711 PMIC MFC driver
4acad189bSGuennadi Liakhovetski *
5acad189bSGuennadi Liakhovetski * Copyright (C) 2012 Renesas Electronics Corporation
6acad189bSGuennadi Liakhovetski * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
7acad189bSGuennadi Liakhovetski */
8acad189bSGuennadi Liakhovetski
9acad189bSGuennadi Liakhovetski #include <linux/device.h>
10acad189bSGuennadi Liakhovetski #include <linux/err.h>
11acad189bSGuennadi Liakhovetski #include <linux/i2c.h>
12acad189bSGuennadi Liakhovetski #include <linux/init.h>
13acad189bSGuennadi Liakhovetski #include <linux/kernel.h>
14acad189bSGuennadi Liakhovetski #include <linux/mfd/as3711.h>
15acad189bSGuennadi Liakhovetski #include <linux/mfd/core.h>
160af6f271SSachin Kamat #include <linux/of.h>
17acad189bSGuennadi Liakhovetski #include <linux/regmap.h>
18acad189bSGuennadi Liakhovetski #include <linux/slab.h>
19acad189bSGuennadi Liakhovetski
20acad189bSGuennadi Liakhovetski enum {
21acad189bSGuennadi Liakhovetski AS3711_REGULATOR,
22acad189bSGuennadi Liakhovetski AS3711_BACKLIGHT,
23acad189bSGuennadi Liakhovetski };
24acad189bSGuennadi Liakhovetski
25acad189bSGuennadi Liakhovetski /*
26acad189bSGuennadi Liakhovetski * Ok to have it static: it is only used during probing and multiple I2C devices
27acad189bSGuennadi Liakhovetski * cannot be probed simultaneously. Just make sure to avoid stale data.
28acad189bSGuennadi Liakhovetski */
29acad189bSGuennadi Liakhovetski static struct mfd_cell as3711_subdevs[] = {
30acad189bSGuennadi Liakhovetski [AS3711_REGULATOR] = {.name = "as3711-regulator",},
31acad189bSGuennadi Liakhovetski [AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
32acad189bSGuennadi Liakhovetski };
33acad189bSGuennadi Liakhovetski
as3711_volatile_reg(struct device * dev,unsigned int reg)34acad189bSGuennadi Liakhovetski static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
35acad189bSGuennadi Liakhovetski {
36acad189bSGuennadi Liakhovetski switch (reg) {
37acad189bSGuennadi Liakhovetski case AS3711_GPIO_SIGNAL_IN:
38acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_1:
39acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_2:
40acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_3:
41acad189bSGuennadi Liakhovetski case AS3711_CHARGER_STATUS_1:
42acad189bSGuennadi Liakhovetski case AS3711_CHARGER_STATUS_2:
43acad189bSGuennadi Liakhovetski case AS3711_REG_STATUS:
44acad189bSGuennadi Liakhovetski return true;
45acad189bSGuennadi Liakhovetski }
46acad189bSGuennadi Liakhovetski return false;
47acad189bSGuennadi Liakhovetski }
48acad189bSGuennadi Liakhovetski
as3711_precious_reg(struct device * dev,unsigned int reg)49acad189bSGuennadi Liakhovetski static bool as3711_precious_reg(struct device *dev, unsigned int reg)
50acad189bSGuennadi Liakhovetski {
51acad189bSGuennadi Liakhovetski switch (reg) {
52acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_1:
53acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_2:
54acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_3:
55acad189bSGuennadi Liakhovetski return true;
56acad189bSGuennadi Liakhovetski }
57acad189bSGuennadi Liakhovetski return false;
58acad189bSGuennadi Liakhovetski }
59acad189bSGuennadi Liakhovetski
as3711_readable_reg(struct device * dev,unsigned int reg)60acad189bSGuennadi Liakhovetski static bool as3711_readable_reg(struct device *dev, unsigned int reg)
61acad189bSGuennadi Liakhovetski {
62acad189bSGuennadi Liakhovetski switch (reg) {
63acad189bSGuennadi Liakhovetski case AS3711_SD_1_VOLTAGE:
64acad189bSGuennadi Liakhovetski case AS3711_SD_2_VOLTAGE:
65acad189bSGuennadi Liakhovetski case AS3711_SD_3_VOLTAGE:
66acad189bSGuennadi Liakhovetski case AS3711_SD_4_VOLTAGE:
67acad189bSGuennadi Liakhovetski case AS3711_LDO_1_VOLTAGE:
68acad189bSGuennadi Liakhovetski case AS3711_LDO_2_VOLTAGE:
69acad189bSGuennadi Liakhovetski case AS3711_LDO_3_VOLTAGE:
70acad189bSGuennadi Liakhovetski case AS3711_LDO_4_VOLTAGE:
71acad189bSGuennadi Liakhovetski case AS3711_LDO_5_VOLTAGE:
72acad189bSGuennadi Liakhovetski case AS3711_LDO_6_VOLTAGE:
73acad189bSGuennadi Liakhovetski case AS3711_LDO_7_VOLTAGE:
74acad189bSGuennadi Liakhovetski case AS3711_LDO_8_VOLTAGE:
75acad189bSGuennadi Liakhovetski case AS3711_SD_CONTROL:
76acad189bSGuennadi Liakhovetski case AS3711_GPIO_SIGNAL_OUT:
77acad189bSGuennadi Liakhovetski case AS3711_GPIO_SIGNAL_IN:
78acad189bSGuennadi Liakhovetski case AS3711_SD_CONTROL_1:
79acad189bSGuennadi Liakhovetski case AS3711_SD_CONTROL_2:
80acad189bSGuennadi Liakhovetski case AS3711_CURR_CONTROL:
81acad189bSGuennadi Liakhovetski case AS3711_CURR1_VALUE:
82acad189bSGuennadi Liakhovetski case AS3711_CURR2_VALUE:
83acad189bSGuennadi Liakhovetski case AS3711_CURR3_VALUE:
84acad189bSGuennadi Liakhovetski case AS3711_STEPUP_CONTROL_1:
85acad189bSGuennadi Liakhovetski case AS3711_STEPUP_CONTROL_2:
86acad189bSGuennadi Liakhovetski case AS3711_STEPUP_CONTROL_4:
87acad189bSGuennadi Liakhovetski case AS3711_STEPUP_CONTROL_5:
88acad189bSGuennadi Liakhovetski case AS3711_REG_STATUS:
89acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_1:
90acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_2:
91acad189bSGuennadi Liakhovetski case AS3711_INTERRUPT_STATUS_3:
92acad189bSGuennadi Liakhovetski case AS3711_CHARGER_STATUS_1:
93acad189bSGuennadi Liakhovetski case AS3711_CHARGER_STATUS_2:
94acad189bSGuennadi Liakhovetski case AS3711_ASIC_ID_1:
95acad189bSGuennadi Liakhovetski case AS3711_ASIC_ID_2:
96acad189bSGuennadi Liakhovetski return true;
97acad189bSGuennadi Liakhovetski }
98acad189bSGuennadi Liakhovetski return false;
99acad189bSGuennadi Liakhovetski }
100acad189bSGuennadi Liakhovetski
101acad189bSGuennadi Liakhovetski static const struct regmap_config as3711_regmap_config = {
102acad189bSGuennadi Liakhovetski .reg_bits = 8,
103acad189bSGuennadi Liakhovetski .val_bits = 8,
104acad189bSGuennadi Liakhovetski .volatile_reg = as3711_volatile_reg,
105acad189bSGuennadi Liakhovetski .readable_reg = as3711_readable_reg,
106acad189bSGuennadi Liakhovetski .precious_reg = as3711_precious_reg,
107e9b7ba79SMaciej S. Szmigiero .max_register = AS3711_MAX_REG,
108e9b7ba79SMaciej S. Szmigiero .num_reg_defaults_raw = AS3711_NUM_REGS,
109acad189bSGuennadi Liakhovetski .cache_type = REGCACHE_RBTREE,
110acad189bSGuennadi Liakhovetski };
111acad189bSGuennadi Liakhovetski
11264710af3SGuennadi Liakhovetski #ifdef CONFIG_OF
11344560303SKrzysztof Kozlowski static const struct of_device_id as3711_of_match[] = {
11464710af3SGuennadi Liakhovetski {.compatible = "ams,as3711",},
11564710af3SGuennadi Liakhovetski {}
11664710af3SGuennadi Liakhovetski };
11764710af3SGuennadi Liakhovetski #endif
11864710af3SGuennadi Liakhovetski
as3711_i2c_probe(struct i2c_client * client)1194a36fb26SUwe Kleine-König static int as3711_i2c_probe(struct i2c_client *client)
120acad189bSGuennadi Liakhovetski {
121acad189bSGuennadi Liakhovetski struct as3711 *as3711;
12264710af3SGuennadi Liakhovetski struct as3711_platform_data *pdata;
123acad189bSGuennadi Liakhovetski unsigned int id1, id2;
124acad189bSGuennadi Liakhovetski int ret;
125acad189bSGuennadi Liakhovetski
12664710af3SGuennadi Liakhovetski if (!client->dev.of_node) {
127334a41ceSJingoo Han pdata = dev_get_platdata(&client->dev);
128acad189bSGuennadi Liakhovetski if (!pdata)
129acad189bSGuennadi Liakhovetski dev_dbg(&client->dev, "Platform data not found\n");
13064710af3SGuennadi Liakhovetski } else {
13164710af3SGuennadi Liakhovetski pdata = devm_kzalloc(&client->dev,
13264710af3SGuennadi Liakhovetski sizeof(*pdata), GFP_KERNEL);
133ae487ae2SLee Jones if (!pdata)
13464710af3SGuennadi Liakhovetski return -ENOMEM;
13564710af3SGuennadi Liakhovetski }
136acad189bSGuennadi Liakhovetski
137acad189bSGuennadi Liakhovetski as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
138ae487ae2SLee Jones if (!as3711)
139acad189bSGuennadi Liakhovetski return -ENOMEM;
140acad189bSGuennadi Liakhovetski
141acad189bSGuennadi Liakhovetski as3711->dev = &client->dev;
142acad189bSGuennadi Liakhovetski i2c_set_clientdata(client, as3711);
143acad189bSGuennadi Liakhovetski
144acad189bSGuennadi Liakhovetski if (client->irq)
145acad189bSGuennadi Liakhovetski dev_notice(&client->dev, "IRQ not supported yet\n");
146acad189bSGuennadi Liakhovetski
147acad189bSGuennadi Liakhovetski as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
148acad189bSGuennadi Liakhovetski if (IS_ERR(as3711->regmap)) {
149acad189bSGuennadi Liakhovetski ret = PTR_ERR(as3711->regmap);
150ae487ae2SLee Jones dev_err(&client->dev,
151ae487ae2SLee Jones "regmap initialization failed: %d\n", ret);
152acad189bSGuennadi Liakhovetski return ret;
153acad189bSGuennadi Liakhovetski }
154acad189bSGuennadi Liakhovetski
155acad189bSGuennadi Liakhovetski ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
156acad189bSGuennadi Liakhovetski if (!ret)
157acad189bSGuennadi Liakhovetski ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
158acad189bSGuennadi Liakhovetski if (ret < 0) {
159acad189bSGuennadi Liakhovetski dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
160acad189bSGuennadi Liakhovetski return ret;
161acad189bSGuennadi Liakhovetski }
162acad189bSGuennadi Liakhovetski if (id1 != 0x8b)
163acad189bSGuennadi Liakhovetski return -ENODEV;
164acad189bSGuennadi Liakhovetski dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);
165acad189bSGuennadi Liakhovetski
166ae487ae2SLee Jones /*
167ae487ae2SLee Jones * We can reuse as3711_subdevs[],
168ae487ae2SLee Jones * it will be copied in mfd_add_devices()
169ae487ae2SLee Jones */
170acad189bSGuennadi Liakhovetski if (pdata) {
171ae487ae2SLee Jones as3711_subdevs[AS3711_REGULATOR].platform_data =
172ae487ae2SLee Jones &pdata->regulator;
173ae487ae2SLee Jones as3711_subdevs[AS3711_REGULATOR].pdata_size =
174ae487ae2SLee Jones sizeof(pdata->regulator);
175ae487ae2SLee Jones as3711_subdevs[AS3711_BACKLIGHT].platform_data =
176ae487ae2SLee Jones &pdata->backlight;
177ae487ae2SLee Jones as3711_subdevs[AS3711_BACKLIGHT].pdata_size =
178ae487ae2SLee Jones sizeof(pdata->backlight);
179acad189bSGuennadi Liakhovetski } else {
180acad189bSGuennadi Liakhovetski as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
181acad189bSGuennadi Liakhovetski as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
182acad189bSGuennadi Liakhovetski as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
183acad189bSGuennadi Liakhovetski as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
184acad189bSGuennadi Liakhovetski }
185acad189bSGuennadi Liakhovetski
1869c998326SLaxman Dewangan ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,
187acad189bSGuennadi Liakhovetski ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
188acad189bSGuennadi Liakhovetski if (ret < 0)
189acad189bSGuennadi Liakhovetski dev_err(&client->dev, "add mfd devices failed: %d\n", ret);
190acad189bSGuennadi Liakhovetski
191acad189bSGuennadi Liakhovetski return ret;
192acad189bSGuennadi Liakhovetski }
193acad189bSGuennadi Liakhovetski
194acad189bSGuennadi Liakhovetski static const struct i2c_device_id as3711_i2c_id[] = {
195acad189bSGuennadi Liakhovetski {.name = "as3711", .driver_data = 0},
196acad189bSGuennadi Liakhovetski {}
197acad189bSGuennadi Liakhovetski };
198acad189bSGuennadi Liakhovetski
199acad189bSGuennadi Liakhovetski static struct i2c_driver as3711_i2c_driver = {
200acad189bSGuennadi Liakhovetski .driver = {
201acad189bSGuennadi Liakhovetski .name = "as3711",
20264710af3SGuennadi Liakhovetski .of_match_table = of_match_ptr(as3711_of_match),
203acad189bSGuennadi Liakhovetski },
204*9816d859SUwe Kleine-König .probe = as3711_i2c_probe,
205acad189bSGuennadi Liakhovetski .id_table = as3711_i2c_id,
206acad189bSGuennadi Liakhovetski };
207acad189bSGuennadi Liakhovetski
as3711_i2c_init(void)208acad189bSGuennadi Liakhovetski static int __init as3711_i2c_init(void)
209acad189bSGuennadi Liakhovetski {
210acad189bSGuennadi Liakhovetski return i2c_add_driver(&as3711_i2c_driver);
211acad189bSGuennadi Liakhovetski }
212acad189bSGuennadi Liakhovetski /* Initialise early */
213acad189bSGuennadi Liakhovetski subsys_initcall(as3711_i2c_init);
214