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
36static 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 */
56int 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}
77EXPORT_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 */
88static 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
112int 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}
117EXPORT_SYMBOL_GPL(tps65218_set_bits);
118
119int 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}
124EXPORT_SYMBOL_GPL(tps65218_clear_bits);
125
126static 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
131static 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
136static 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
143static 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
198static 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
208static const struct of_device_id of_tps65218_match_table[] = {
209 { .compatible = "ti,tps65218", },
210 {}
211};
212MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
213
214static int tps65218_voltage_set_strict(struct tps65218 *tps)
215{
216 u32 strict;
217
218 if (of_property_read_u32(tps->dev->of_node,
219 "ti,strict-supply-voltage-supervision",
220 &strict))
221 return 0;
222
223 if (strict != 0 && strict != 1) {
224 dev_err(tps->dev,
225 "Invalid ti,strict-supply-voltage-supervision value\n");
226 return -EINVAL;
227 }
228
229 tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
230 TPS65218_CONFIG1_STRICT,
231 strict ? TPS65218_CONFIG1_STRICT : 0,
232 TPS65218_PROTECT_L1);
233 return 0;
234}
235
236static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
237{
238 u32 hyst;
239
240 if (of_property_read_u32(tps->dev->of_node,
241 "ti,under-voltage-hyst-microvolt", &hyst))
242 return 0;
243
244 if (hyst != 400000 && hyst != 200000) {
245 dev_err(tps->dev,
246 "Invalid ti,under-voltage-hyst-microvolt value\n");
247 return -EINVAL;
248 }
249
250 tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
251 TPS65218_CONFIG2_UVLOHYS,
252 hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
253 TPS65218_PROTECT_L1);
254 return 0;
255}
256
257static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
258{
259 u32 uvlo;
260 int uvloval;
261
262 if (of_property_read_u32(tps->dev->of_node,
263 "ti,under-voltage-limit-microvolt", &uvlo))
264 return 0;
265
266 switch (uvlo) {
267 case 2750000:
268 uvloval = TPS65218_CONFIG1_UVLO_2750000;
269 break;
270 case 2950000:
271 uvloval = TPS65218_CONFIG1_UVLO_2950000;
272 break;
273 case 3250000:
274 uvloval = TPS65218_CONFIG1_UVLO_3250000;
275 break;
276 case 3350000:
277 uvloval = TPS65218_CONFIG1_UVLO_3350000;
278 break;
279 default:
280 dev_err(tps->dev,
281 "Invalid ti,under-voltage-limit-microvolt value\n");
282 return -EINVAL;
283 }
284
285 tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
286 TPS65218_CONFIG1_UVLO_MASK, uvloval,
287 TPS65218_PROTECT_L1);
288 return 0;
289}
290
291static int tps65218_probe(struct i2c_client *client,
292 const struct i2c_device_id *ids)
293{
294 struct tps65218 *tps;
295 int ret;
296 unsigned int chipid;
297
298 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
299 if (!tps)
300 return -ENOMEM;
301
302 i2c_set_clientdata(client, tps);
303 tps->dev = &client->dev;
304 tps->irq = client->irq;
305 tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
306 if (IS_ERR(tps->regmap)) {
307 ret = PTR_ERR(tps->regmap);
308 dev_err(tps->dev, "Failed to allocate register map: %d\n",
309 ret);
310 return ret;
311 }
312
313 mutex_init(&tps->tps_lock);
314
315 ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq,
316 IRQF_ONESHOT, 0, &tps65218_irq_chip,
317 &tps->irq_data);
318 if (ret < 0)
319 return ret;
320
321 ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid);
322 if (ret) {
323 dev_err(tps->dev, "Failed to read chipid: %d\n", ret);
324 return ret;
325 }
326
327 tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
328
329 ret = tps65218_voltage_set_strict(tps);
330 if (ret)
331 return ret;
332
333 ret = tps65218_voltage_set_uvlo(tps);
334 if (ret)
335 return ret;
336
337 ret = tps65218_voltage_set_uv_hyst(tps);
338 if (ret)
339 return ret;
340
341 ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
342 ARRAY_SIZE(tps65218_cells), NULL, 0,
343 regmap_irq_get_domain(tps->irq_data));
344
345 return ret;
346}
347
348static const struct i2c_device_id tps65218_id_table[] = {
349 { "tps65218", TPS65218 },
350 { },
351};
352MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
353
354static struct i2c_driver tps65218_driver = {
355 .driver = {
356 .name = "tps65218",
357 .of_match_table = of_tps65218_match_table,
358 },
359 .probe = tps65218_probe,
360 .id_table = tps65218_id_table,
361};
362
363module_i2c_driver(tps65218_driver);
364
365MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
366MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
367MODULE_LICENSE("GPL v2");
368