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d48f411c AC |
1 | /* |
2 | * tps65217.c | |
3 | * | |
4 | * TPS65217 chip family multi-function driver | |
5 | * | |
6 | * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation version 2. | |
11 | * | |
12 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
13 | * kind, whether express or implied; without even the implied warranty | |
14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/i2c.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/regmap.h> | |
26 | #include <linux/err.h> | |
817bb7fb AC |
27 | #include <linux/of.h> |
28 | #include <linux/of_device.h> | |
d48f411c AC |
29 | |
30 | #include <linux/mfd/core.h> | |
31 | #include <linux/mfd/tps65217.h> | |
32 | ||
30fe2b5b | 33 | static const struct mfd_cell tps65217s[] = { |
817bb7fb AC |
34 | { |
35 | .name = "tps65217-pmic", | |
36 | }, | |
b6290ffe MK |
37 | { |
38 | .name = "tps65217-bl", | |
39 | }, | |
817bb7fb AC |
40 | }; |
41 | ||
d48f411c AC |
42 | /** |
43 | * tps65217_reg_read: Read a single tps65217 register. | |
44 | * | |
45 | * @tps: Device to read from. | |
46 | * @reg: Register to read. | |
47 | * @val: Contians the value | |
48 | */ | |
49 | int tps65217_reg_read(struct tps65217 *tps, unsigned int reg, | |
50 | unsigned int *val) | |
51 | { | |
52 | return regmap_read(tps->regmap, reg, val); | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(tps65217_reg_read); | |
55 | ||
56 | /** | |
57 | * tps65217_reg_write: Write a single tps65217 register. | |
58 | * | |
59 | * @tps65217: Device to write to. | |
60 | * @reg: Register to write to. | |
61 | * @val: Value to write. | |
62 | * @level: Password protected level | |
63 | */ | |
64 | int tps65217_reg_write(struct tps65217 *tps, unsigned int reg, | |
65 | unsigned int val, unsigned int level) | |
66 | { | |
67 | int ret; | |
68 | unsigned int xor_reg_val; | |
69 | ||
70 | switch (level) { | |
71 | case TPS65217_PROTECT_NONE: | |
72 | return regmap_write(tps->regmap, reg, val); | |
73 | case TPS65217_PROTECT_L1: | |
74 | xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; | |
75 | ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, | |
76 | xor_reg_val); | |
77 | if (ret < 0) | |
78 | return ret; | |
79 | ||
80 | return regmap_write(tps->regmap, reg, val); | |
81 | case TPS65217_PROTECT_L2: | |
82 | xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; | |
83 | ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, | |
84 | xor_reg_val); | |
85 | if (ret < 0) | |
86 | return ret; | |
87 | ret = regmap_write(tps->regmap, reg, val); | |
88 | if (ret < 0) | |
89 | return ret; | |
90 | ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, | |
91 | xor_reg_val); | |
92 | if (ret < 0) | |
93 | return ret; | |
94 | return regmap_write(tps->regmap, reg, val); | |
95 | default: | |
96 | return -EINVAL; | |
97 | } | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(tps65217_reg_write); | |
100 | ||
101 | /** | |
102 | * tps65217_update_bits: Modify bits w.r.t mask, val and level. | |
103 | * | |
104 | * @tps65217: Device to write to. | |
105 | * @reg: Register to read-write to. | |
106 | * @mask: Mask. | |
107 | * @val: Value to write. | |
108 | * @level: Password protected level | |
109 | */ | |
27757e82 | 110 | static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg, |
d48f411c AC |
111 | unsigned int mask, unsigned int val, unsigned int level) |
112 | { | |
113 | int ret; | |
114 | unsigned int data; | |
115 | ||
116 | ret = tps65217_reg_read(tps, reg, &data); | |
117 | if (ret) { | |
118 | dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | data &= ~mask; | |
123 | data |= val & mask; | |
124 | ||
125 | ret = tps65217_reg_write(tps, reg, data, level); | |
126 | if (ret) | |
127 | dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
132 | int tps65217_set_bits(struct tps65217 *tps, unsigned int reg, | |
133 | unsigned int mask, unsigned int val, unsigned int level) | |
134 | { | |
135 | return tps65217_update_bits(tps, reg, mask, val, level); | |
136 | } | |
137 | EXPORT_SYMBOL_GPL(tps65217_set_bits); | |
138 | ||
139 | int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg, | |
140 | unsigned int mask, unsigned int level) | |
141 | { | |
142 | return tps65217_update_bits(tps, reg, mask, 0, level); | |
143 | } | |
144 | EXPORT_SYMBOL_GPL(tps65217_clear_bits); | |
145 | ||
146 | static struct regmap_config tps65217_regmap_config = { | |
147 | .reg_bits = 8, | |
148 | .val_bits = 8, | |
149 | }; | |
150 | ||
817bb7fb AC |
151 | static const struct of_device_id tps65217_of_match[] = { |
152 | { .compatible = "ti,tps65217", .data = (void *)TPS65217 }, | |
153 | { /* sentinel */ }, | |
154 | }; | |
155 | ||
f791be49 | 156 | static int tps65217_probe(struct i2c_client *client, |
d48f411c AC |
157 | const struct i2c_device_id *ids) |
158 | { | |
159 | struct tps65217 *tps; | |
d48f411c | 160 | unsigned int version; |
5c6fbd56 | 161 | unsigned long chip_id = ids->driver_data; |
817bb7fb | 162 | const struct of_device_id *match; |
eb433dad | 163 | bool status_off = false; |
817bb7fb | 164 | int ret; |
d48f411c | 165 | |
817bb7fb AC |
166 | if (client->dev.of_node) { |
167 | match = of_match_device(tps65217_of_match, &client->dev); | |
168 | if (!match) { | |
169 | dev_err(&client->dev, | |
170 | "Failed to find matching dt id\n"); | |
171 | return -EINVAL; | |
172 | } | |
5c6fbd56 | 173 | chip_id = (unsigned long)match->data; |
eb433dad CFP |
174 | status_off = of_property_read_bool(client->dev.of_node, |
175 | "ti,pmic-shutdown-controller"); | |
817bb7fb AC |
176 | } |
177 | ||
178 | if (!chip_id) { | |
179 | dev_err(&client->dev, "id is null.\n"); | |
180 | return -ENODEV; | |
181 | } | |
a7f1b63e | 182 | |
d48f411c AC |
183 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); |
184 | if (!tps) | |
185 | return -ENOMEM; | |
186 | ||
817bb7fb AC |
187 | i2c_set_clientdata(client, tps); |
188 | tps->dev = &client->dev; | |
189 | tps->id = chip_id; | |
190 | ||
0ef4619c | 191 | tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config); |
d48f411c AC |
192 | if (IS_ERR(tps->regmap)) { |
193 | ret = PTR_ERR(tps->regmap); | |
194 | dev_err(tps->dev, "Failed to allocate register map: %d\n", | |
195 | ret); | |
196 | return ret; | |
197 | } | |
198 | ||
817bb7fb | 199 | ret = mfd_add_devices(tps->dev, -1, tps65217s, |
55692af5 | 200 | ARRAY_SIZE(tps65217s), NULL, 0, NULL); |
817bb7fb AC |
201 | if (ret < 0) { |
202 | dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret); | |
203 | return ret; | |
204 | } | |
d48f411c AC |
205 | |
206 | ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version); | |
207 | if (ret < 0) { | |
0ef4619c AL |
208 | dev_err(tps->dev, "Failed to read revision register: %d\n", |
209 | ret); | |
210 | return ret; | |
d48f411c AC |
211 | } |
212 | ||
eb433dad CFP |
213 | /* Set the PMIC to shutdown on PWR_EN toggle */ |
214 | if (status_off) { | |
215 | ret = tps65217_set_bits(tps, TPS65217_REG_STATUS, | |
216 | TPS65217_STATUS_OFF, TPS65217_STATUS_OFF, | |
217 | TPS65217_PROTECT_NONE); | |
218 | if (ret) | |
219 | dev_warn(tps->dev, "unable to set the status OFF\n"); | |
220 | } | |
221 | ||
d48f411c AC |
222 | dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n", |
223 | (version & TPS65217_CHIPID_CHIP_MASK) >> 4, | |
224 | version & TPS65217_CHIPID_REV_MASK); | |
225 | ||
d48f411c | 226 | return 0; |
d48f411c AC |
227 | } |
228 | ||
4740f73f | 229 | static int tps65217_remove(struct i2c_client *client) |
d48f411c AC |
230 | { |
231 | struct tps65217 *tps = i2c_get_clientdata(client); | |
d48f411c | 232 | |
817bb7fb | 233 | mfd_remove_devices(tps->dev); |
d48f411c | 234 | |
d48f411c AC |
235 | return 0; |
236 | } | |
237 | ||
238 | static const struct i2c_device_id tps65217_id_table[] = { | |
817bb7fb AC |
239 | {"tps65217", TPS65217}, |
240 | { /* sentinel */ } | |
d48f411c AC |
241 | }; |
242 | MODULE_DEVICE_TABLE(i2c, tps65217_id_table); | |
243 | ||
244 | static struct i2c_driver tps65217_driver = { | |
245 | .driver = { | |
246 | .name = "tps65217", | |
a7f1b63e | 247 | .owner = THIS_MODULE, |
a351451a | 248 | .of_match_table = tps65217_of_match, |
d48f411c AC |
249 | }, |
250 | .id_table = tps65217_id_table, | |
251 | .probe = tps65217_probe, | |
84449216 | 252 | .remove = tps65217_remove, |
d48f411c AC |
253 | }; |
254 | ||
255 | static int __init tps65217_init(void) | |
256 | { | |
257 | return i2c_add_driver(&tps65217_driver); | |
258 | } | |
259 | subsys_initcall(tps65217_init); | |
260 | ||
261 | static void __exit tps65217_exit(void) | |
262 | { | |
263 | i2c_del_driver(&tps65217_driver); | |
264 | } | |
265 | module_exit(tps65217_exit); | |
266 | ||
267 | MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>"); | |
268 | MODULE_DESCRIPTION("TPS65217 chip family multi-function driver"); | |
269 | MODULE_LICENSE("GPL v2"); |