1 /*
2 * Driver for TPS65218 Integrated power management chipsets
3 *
4 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether expressed or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details.
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/device.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/init.h>
21 #include <linux/i2c.h>
22 #include <linux/slab.h>
23 #include <linux/regmap.h>
24 #include <linux/err.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/irq.h>
28 #include <linux/interrupt.h>
29 #include <linux/mutex.h>
30
31 #include <linux/mfd/core.h>
32 #include <linux/mfd/tps65218.h>
33
34 #define TPS65218_PASSWORD_REGS_UNLOCK 0x7D
35
36 static const struct mfd_cell tps65218_cells[] = {
37 {
38 .name = "tps65218-pwrbutton",
39 .of_compatible = "ti,tps65218-pwrbutton",
40 },
41 {
42 .name = "tps65218-gpio",
43 .of_compatible = "ti,tps65218-gpio",
44 },
45 { .name = "tps65218-regulator", },
46 };
47
48 /**
49 * tps65218_reg_write: Write a single tps65218 register.
50 *
51 * @tps65218: Device to write to.
52 * @reg: Register to write to.
53 * @val: Value to write.
54 * @level: Password protected level
55 */
tps65218_reg_write(struct tps65218 * tps,unsigned int reg,unsigned int val,unsigned int level)56 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
57 unsigned int val, unsigned int level)
58 {
59 int ret;
60 unsigned int xor_reg_val;
61
62 switch (level) {
63 case TPS65218_PROTECT_NONE:
64 return regmap_write(tps->regmap, reg, val);
65 case TPS65218_PROTECT_L1:
66 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
67 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
68 xor_reg_val);
69 if (ret < 0)
70 return ret;
71
72 return regmap_write(tps->regmap, reg, val);
73 default:
74 return -EINVAL;
75 }
76 }
77 EXPORT_SYMBOL_GPL(tps65218_reg_write);
78
79 /**
80 * tps65218_update_bits: Modify bits w.r.t mask, val and level.
81 *
82 * @tps65218: Device to write to.
83 * @reg: Register to read-write to.
84 * @mask: Mask.
85 * @val: Value to write.
86 * @level: Password protected level
87 */
tps65218_update_bits(struct tps65218 * tps,unsigned int reg,unsigned int mask,unsigned int val,unsigned int level)88 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
89 unsigned int mask, unsigned int val, unsigned int level)
90 {
91 int ret;
92 unsigned int data;
93
94 ret = regmap_read(tps->regmap, reg, &data);
95 if (ret) {
96 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
97 return ret;
98 }
99
100 data &= ~mask;
101 data |= val & mask;
102
103 mutex_lock(&tps->tps_lock);
104 ret = tps65218_reg_write(tps, reg, data, level);
105 if (ret)
106 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
107 mutex_unlock(&tps->tps_lock);
108
109 return ret;
110 }
111
tps65218_set_bits(struct tps65218 * tps,unsigned int reg,unsigned int mask,unsigned int val,unsigned int level)112 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
113 unsigned int mask, unsigned int val, unsigned int level)
114 {
115 return tps65218_update_bits(tps, reg, mask, val, level);
116 }
117 EXPORT_SYMBOL_GPL(tps65218_set_bits);
118
tps65218_clear_bits(struct tps65218 * tps,unsigned int reg,unsigned int mask,unsigned int level)119 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
120 unsigned int mask, unsigned int level)
121 {
122 return tps65218_update_bits(tps, reg, mask, 0, level);
123 }
124 EXPORT_SYMBOL_GPL(tps65218_clear_bits);
125
126 static const struct regmap_range tps65218_yes_ranges[] = {
127 regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
128 regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
129 };
130
131 static const struct regmap_access_table tps65218_volatile_table = {
132 .yes_ranges = tps65218_yes_ranges,
133 .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
134 };
135
136 static const struct regmap_config tps65218_regmap_config = {
137 .reg_bits = 8,
138 .val_bits = 8,
139 .cache_type = REGCACHE_RBTREE,
140 .volatile_table = &tps65218_volatile_table,
141 };
142
143 static const struct regmap_irq tps65218_irqs[] = {
144 /* INT1 IRQs */
145 [TPS65218_PRGC_IRQ] = {
146 .mask = TPS65218_INT1_PRGC,
147 },
148 [TPS65218_CC_AQC_IRQ] = {
149 .mask = TPS65218_INT1_CC_AQC,
150 },
151 [TPS65218_HOT_IRQ] = {
152 .mask = TPS65218_INT1_HOT,
153 },
154 [TPS65218_PB_IRQ] = {
155 .mask = TPS65218_INT1_PB,
156 },
157 [TPS65218_AC_IRQ] = {
158 .mask = TPS65218_INT1_AC,
159 },
160 [TPS65218_VPRG_IRQ] = {
161 .mask = TPS65218_INT1_VPRG,
162 },
163 [TPS65218_INVALID1_IRQ] = {
164 },
165 [TPS65218_INVALID2_IRQ] = {
166 },
167 /* INT2 IRQs*/
168 [TPS65218_LS1_I_IRQ] = {
169 .mask = TPS65218_INT2_LS1_I,
170 .reg_offset = 1,
171 },
172 [TPS65218_LS2_I_IRQ] = {
173 .mask = TPS65218_INT2_LS2_I,
174 .reg_offset = 1,
175 },
176 [TPS65218_LS3_I_IRQ] = {
177 .mask = TPS65218_INT2_LS3_I,
178 .reg_offset = 1,
179 },
180 [TPS65218_LS1_F_IRQ] = {
181 .mask = TPS65218_INT2_LS1_F,
182 .reg_offset = 1,
183 },
184 [TPS65218_LS2_F_IRQ] = {
185 .mask = TPS65218_INT2_LS2_F,
186 .reg_offset = 1,
187 },
188 [TPS65218_LS3_F_IRQ] = {
189 .mask = TPS65218_INT2_LS3_F,
190 .reg_offset = 1,
191 },
192 [TPS65218_INVALID3_IRQ] = {
193 },
194 [TPS65218_INVALID4_IRQ] = {
195 },
196 };
197
198 static struct regmap_irq_chip tps65218_irq_chip = {
199 .name = "tps65218",
200 .irqs = tps65218_irqs,
201 .num_irqs = ARRAY_SIZE(tps65218_irqs),
202
203 .num_regs = 2,
204 .mask_base = TPS65218_REG_INT_MASK1,
205 .status_base = TPS65218_REG_INT1,
206 };
207
208 static const struct of_device_id of_tps65218_match_table[] = {
209 { .compatible = "ti,tps65218", },
210 {}
211 };
212 MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
213
tps65218_probe(struct i2c_client * client,const struct i2c_device_id * ids)214 static int tps65218_probe(struct i2c_client *client,
215 const struct i2c_device_id *ids)
216 {
217 struct tps65218 *tps;
218 int ret;
219 unsigned int chipid;
220
221 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
222 if (!tps)
223 return -ENOMEM;
224
225 i2c_set_clientdata(client, tps);
226 tps->dev = &client->dev;
227 tps->irq = client->irq;
228 tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
229 if (IS_ERR(tps->regmap)) {
230 ret = PTR_ERR(tps->regmap);
231 dev_err(tps->dev, "Failed to allocate register map: %d\n",
232 ret);
233 return ret;
234 }
235
236 mutex_init(&tps->tps_lock);
237
238 ret = regmap_add_irq_chip(tps->regmap, tps->irq,
239 IRQF_ONESHOT, 0, &tps65218_irq_chip,
240 &tps->irq_data);
241 if (ret < 0)
242 return ret;
243
244 ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid);
245 if (ret) {
246 dev_err(tps->dev, "Failed to read chipid: %d\n", ret);
247 return ret;
248 }
249
250 tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
251
252 ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
253 ARRAY_SIZE(tps65218_cells), NULL, 0,
254 regmap_irq_get_domain(tps->irq_data));
255
256 if (ret < 0)
257 goto err_irq;
258
259 return 0;
260
261 err_irq:
262 regmap_del_irq_chip(tps->irq, tps->irq_data);
263
264 return ret;
265 }
266
tps65218_remove(struct i2c_client * client)267 static int tps65218_remove(struct i2c_client *client)
268 {
269 struct tps65218 *tps = i2c_get_clientdata(client);
270
271 regmap_del_irq_chip(tps->irq, tps->irq_data);
272
273 return 0;
274 }
275
276 static const struct i2c_device_id tps65218_id_table[] = {
277 { "tps65218", TPS65218 },
278 { },
279 };
280 MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
281
282 static struct i2c_driver tps65218_driver = {
283 .driver = {
284 .name = "tps65218",
285 .of_match_table = of_tps65218_match_table,
286 },
287 .probe = tps65218_probe,
288 .remove = tps65218_remove,
289 .id_table = tps65218_id_table,
290 };
291
292 module_i2c_driver(tps65218_driver);
293
294 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
295 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
296 MODULE_LICENSE("GPL v2");
297
