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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for TPS65218 Integrated power management chipsets
4 *
5 * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
6 */
7
8#include <linux/kernel.h>
9#include <linux/device.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/init.h>
13#include <linux/i2c.h>
14#include <linux/slab.h>
15#include <linux/regmap.h>
16#include <linux/err.h>
17#include <linux/of.h>
18#include <linux/of_device.h>
19#include <linux/irq.h>
20#include <linux/interrupt.h>
21#include <linux/mutex.h>
22
23#include <linux/mfd/core.h>
24#include <linux/mfd/tps65218.h>
25
26#define TPS65218_PASSWORD_REGS_UNLOCK 0x7D
27
28static const struct mfd_cell tps65218_cells[] = {
29 {
30 .name = "tps65218-pwrbutton",
31 .of_compatible = "ti,tps65218-pwrbutton",
32 },
33 {
34 .name = "tps65218-gpio",
35 .of_compatible = "ti,tps65218-gpio",
36 },
37 { .name = "tps65218-regulator", },
38};
39
40/**
41 * tps65218_reg_write: Write a single tps65218 register.
42 *
43 * @tps: Device to write to.
44 * @reg: Register to write to.
45 * @val: Value to write.
46 * @level: Password protected level
47 */
48int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
49 unsigned int val, unsigned int level)
50{
51 int ret;
52 unsigned int xor_reg_val;
53
54 switch (level) {
55 case TPS65218_PROTECT_NONE:
56 return regmap_write(tps->regmap, reg, val);
57 case TPS65218_PROTECT_L1:
58 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
59 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
60 xor_reg_val);
61 if (ret < 0)
62 return ret;
63
64 return regmap_write(tps->regmap, reg, val);
65 default:
66 return -EINVAL;
67 }
68}
69EXPORT_SYMBOL_GPL(tps65218_reg_write);
70
71/**
72 * tps65218_update_bits: Modify bits w.r.t mask, val and level.
73 *
74 * @tps: Device to write to.
75 * @reg: Register to read-write to.
76 * @mask: Mask.
77 * @val: Value to write.
78 * @level: Password protected level
79 */
80static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
81 unsigned int mask, unsigned int val, unsigned int level)
82{
83 int ret;
84 unsigned int data;
85
86 ret = regmap_read(tps->regmap, reg, &data);
87 if (ret) {
88 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
89 return ret;
90 }
91
92 data &= ~mask;
93 data |= val & mask;
94
95 mutex_lock(&tps->tps_lock);
96 ret = tps65218_reg_write(tps, reg, data, level);
97 if (ret)
98 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
99 mutex_unlock(&tps->tps_lock);
100
101 return ret;
102}
103
104int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
105 unsigned int mask, unsigned int val, unsigned int level)
106{
107 return tps65218_update_bits(tps, reg, mask, val, level);
108}
109EXPORT_SYMBOL_GPL(tps65218_set_bits);
110
111int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
112 unsigned int mask, unsigned int level)
113{
114 return tps65218_update_bits(tps, reg, mask, 0, level);
115}
116EXPORT_SYMBOL_GPL(tps65218_clear_bits);
117
118static const struct regmap_range tps65218_yes_ranges[] = {
119 regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
120 regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
121};
122
123static const struct regmap_access_table tps65218_volatile_table = {
124 .yes_ranges = tps65218_yes_ranges,
125 .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
126};
127
128static const struct regmap_config tps65218_regmap_config = {
129 .reg_bits = 8,
130 .val_bits = 8,
131 .cache_type = REGCACHE_RBTREE,
132 .volatile_table = &tps65218_volatile_table,
133};
134
135static const struct regmap_irq tps65218_irqs[] = {
136 /* INT1 IRQs */
137 [TPS65218_PRGC_IRQ] = {
138 .mask = TPS65218_INT1_PRGC,
139 },
140 [TPS65218_CC_AQC_IRQ] = {
141 .mask = TPS65218_INT1_CC_AQC,
142 },
143 [TPS65218_HOT_IRQ] = {
144 .mask = TPS65218_INT1_HOT,
145 },
146 [TPS65218_PB_IRQ] = {
147 .mask = TPS65218_INT1_PB,
148 },
149 [TPS65218_AC_IRQ] = {
150 .mask = TPS65218_INT1_AC,
151 },
152 [TPS65218_VPRG_IRQ] = {
153 .mask = TPS65218_INT1_VPRG,
154 },
155 [TPS65218_INVALID1_IRQ] = {
156 },
157 [TPS65218_INVALID2_IRQ] = {
158 },
159 /* INT2 IRQs*/
160 [TPS65218_LS1_I_IRQ] = {
161 .mask = TPS65218_INT2_LS1_I,
162 .reg_offset = 1,
163 },
164 [TPS65218_LS2_I_IRQ] = {
165 .mask = TPS65218_INT2_LS2_I,
166 .reg_offset = 1,
167 },
168 [TPS65218_LS3_I_IRQ] = {
169 .mask = TPS65218_INT2_LS3_I,
170 .reg_offset = 1,
171 },
172 [TPS65218_LS1_F_IRQ] = {
173 .mask = TPS65218_INT2_LS1_F,
174 .reg_offset = 1,
175 },
176 [TPS65218_LS2_F_IRQ] = {
177 .mask = TPS65218_INT2_LS2_F,
178 .reg_offset = 1,
179 },
180 [TPS65218_LS3_F_IRQ] = {
181 .mask = TPS65218_INT2_LS3_F,
182 .reg_offset = 1,
183 },
184 [TPS65218_INVALID3_IRQ] = {
185 },
186 [TPS65218_INVALID4_IRQ] = {
187 },
188};
189
190static struct regmap_irq_chip tps65218_irq_chip = {
191 .name = "tps65218",
192 .irqs = tps65218_irqs,
193 .num_irqs = ARRAY_SIZE(tps65218_irqs),
194
195 .num_regs = 2,
196 .mask_base = TPS65218_REG_INT_MASK1,
197 .status_base = TPS65218_REG_INT1,
198};
199
200static const struct of_device_id of_tps65218_match_table[] = {
201 { .compatible = "ti,tps65218", },
202 {}
203};
204MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
205
206static int tps65218_voltage_set_strict(struct tps65218 *tps)
207{
208 u32 strict;
209
210 if (of_property_read_u32(tps->dev->of_node,
211 "ti,strict-supply-voltage-supervision",
212 &strict))
213 return 0;
214
215 if (strict != 0 && strict != 1) {
216 dev_err(tps->dev,
217 "Invalid ti,strict-supply-voltage-supervision value\n");
218 return -EINVAL;
219 }
220
221 tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
222 TPS65218_CONFIG1_STRICT,
223 strict ? TPS65218_CONFIG1_STRICT : 0,
224 TPS65218_PROTECT_L1);
225 return 0;
226}
227
228static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
229{
230 u32 hyst;
231
232 if (of_property_read_u32(tps->dev->of_node,
233 "ti,under-voltage-hyst-microvolt", &hyst))
234 return 0;
235
236 if (hyst != 400000 && hyst != 200000) {
237 dev_err(tps->dev,
238 "Invalid ti,under-voltage-hyst-microvolt value\n");
239 return -EINVAL;
240 }
241
242 tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
243 TPS65218_CONFIG2_UVLOHYS,
244 hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
245 TPS65218_PROTECT_L1);
246 return 0;
247}
248
249static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
250{
251 u32 uvlo;
252 int uvloval;
253
254 if (of_property_read_u32(tps->dev->of_node,
255 "ti,under-voltage-limit-microvolt", &uvlo))
256 return 0;
257
258 switch (uvlo) {
259 case 2750000:
260 uvloval = TPS65218_CONFIG1_UVLO_2750000;
261 break;
262 case 2950000:
263 uvloval = TPS65218_CONFIG1_UVLO_2950000;
264 break;
265 case 3250000:
266 uvloval = TPS65218_CONFIG1_UVLO_3250000;
267 break;
268 case 3350000:
269 uvloval = TPS65218_CONFIG1_UVLO_3350000;
270 break;
271 default:
272 dev_err(tps->dev,
273 "Invalid ti,under-voltage-limit-microvolt value\n");
274 return -EINVAL;
275 }
276
277 tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
278 TPS65218_CONFIG1_UVLO_MASK, uvloval,
279 TPS65218_PROTECT_L1);
280 return 0;
281}
282
283static int tps65218_probe(struct i2c_client *client)
284{
285 struct tps65218 *tps;
286 int ret;
287 unsigned int chipid;
288
289 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
290 if (!tps)
291 return -ENOMEM;
292
293 i2c_set_clientdata(client, tps);
294 tps->dev = &client->dev;
295 tps->irq = client->irq;
296 tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
297 if (IS_ERR(tps->regmap)) {
298 ret = PTR_ERR(tps->regmap);
299 dev_err(tps->dev, "Failed to allocate register map: %d\n",
300 ret);
301 return ret;
302 }
303
304 mutex_init(&tps->tps_lock);
305
306 ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq,
307 IRQF_ONESHOT, 0, &tps65218_irq_chip,
308 &tps->irq_data);
309 if (ret < 0)
310 return ret;
311
312 ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid);
313 if (ret) {
314 dev_err(tps->dev, "Failed to read chipid: %d\n", ret);
315 return ret;
316 }
317
318 tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
319
320 ret = tps65218_voltage_set_strict(tps);
321 if (ret)
322 return ret;
323
324 ret = tps65218_voltage_set_uvlo(tps);
325 if (ret)
326 return ret;
327
328 ret = tps65218_voltage_set_uv_hyst(tps);
329 if (ret)
330 return ret;
331
332 ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
333 ARRAY_SIZE(tps65218_cells), NULL, 0,
334 regmap_irq_get_domain(tps->irq_data));
335
336 return ret;
337}
338
339static const struct i2c_device_id tps65218_id_table[] = {
340 { "tps65218", TPS65218 },
341 { },
342};
343MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
344
345static struct i2c_driver tps65218_driver = {
346 .driver = {
347 .name = "tps65218",
348 .of_match_table = of_tps65218_match_table,
349 },
350 .probe_new = tps65218_probe,
351 .id_table = tps65218_id_table,
352};
353
354module_i2c_driver(tps65218_driver);
355
356MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
357MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
358MODULE_LICENSE("GPL v2");