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Carlo Caionecfb61a42014-05-01 14:29:27 +02001/*
2 * axp20x.c - MFD core driver for the X-Powers AXP202 and AXP209
3 *
4 * AXP20x comprises an adaptive USB-Compatible PWM charger, 2 BUCK DC-DC
5 * converters, 5 LDOs, multiple 12-bit ADCs of voltage, current and temperature
6 * as well as 4 configurable GPIOs.
7 *
8 * Author: Carlo Caione <carlo@caione.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/err.h>
16#include <linux/i2c.h>
17#include <linux/interrupt.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/pm_runtime.h>
21#include <linux/regmap.h>
22#include <linux/slab.h>
23#include <linux/regulator/consumer.h>
24#include <linux/mfd/axp20x.h>
25#include <linux/mfd/core.h>
26#include <linux/of_device.h>
27#include <linux/of_irq.h>
28
29#define AXP20X_OFF 0x80
30
31static const struct regmap_range axp20x_writeable_ranges[] = {
32 regmap_reg_range(AXP20X_DATACACHE(0), AXP20X_IRQ5_STATE),
33 regmap_reg_range(AXP20X_DCDC_MODE, AXP20X_FG_RES),
34};
35
36static const struct regmap_range axp20x_volatile_ranges[] = {
37 regmap_reg_range(AXP20X_IRQ1_EN, AXP20X_IRQ5_STATE),
38};
39
40static const struct regmap_access_table axp20x_writeable_table = {
41 .yes_ranges = axp20x_writeable_ranges,
42 .n_yes_ranges = ARRAY_SIZE(axp20x_writeable_ranges),
43};
44
45static const struct regmap_access_table axp20x_volatile_table = {
46 .yes_ranges = axp20x_volatile_ranges,
47 .n_yes_ranges = ARRAY_SIZE(axp20x_volatile_ranges),
48};
49
50static struct resource axp20x_pek_resources[] = {
51 {
52 .name = "PEK_DBR",
53 .start = AXP20X_IRQ_PEK_RIS_EDGE,
54 .end = AXP20X_IRQ_PEK_RIS_EDGE,
55 .flags = IORESOURCE_IRQ,
56 }, {
57 .name = "PEK_DBF",
58 .start = AXP20X_IRQ_PEK_FAL_EDGE,
59 .end = AXP20X_IRQ_PEK_FAL_EDGE,
60 .flags = IORESOURCE_IRQ,
61 },
62};
63
64static const struct regmap_config axp20x_regmap_config = {
65 .reg_bits = 8,
66 .val_bits = 8,
67 .wr_table = &axp20x_writeable_table,
68 .volatile_table = &axp20x_volatile_table,
69 .max_register = AXP20X_FG_RES,
70 .cache_type = REGCACHE_RBTREE,
71};
72
73#define AXP20X_IRQ(_irq, _off, _mask) \
74 [AXP20X_IRQ_##_irq] = { .reg_offset = (_off), .mask = BIT(_mask) }
75
76static const struct regmap_irq axp20x_regmap_irqs[] = {
77 AXP20X_IRQ(ACIN_OVER_V, 0, 7),
78 AXP20X_IRQ(ACIN_PLUGIN, 0, 6),
79 AXP20X_IRQ(ACIN_REMOVAL, 0, 5),
80 AXP20X_IRQ(VBUS_OVER_V, 0, 4),
81 AXP20X_IRQ(VBUS_PLUGIN, 0, 3),
82 AXP20X_IRQ(VBUS_REMOVAL, 0, 2),
83 AXP20X_IRQ(VBUS_V_LOW, 0, 1),
84 AXP20X_IRQ(BATT_PLUGIN, 1, 7),
85 AXP20X_IRQ(BATT_REMOVAL, 1, 6),
86 AXP20X_IRQ(BATT_ENT_ACT_MODE, 1, 5),
87 AXP20X_IRQ(BATT_EXIT_ACT_MODE, 1, 4),
88 AXP20X_IRQ(CHARG, 1, 3),
89 AXP20X_IRQ(CHARG_DONE, 1, 2),
90 AXP20X_IRQ(BATT_TEMP_HIGH, 1, 1),
91 AXP20X_IRQ(BATT_TEMP_LOW, 1, 0),
92 AXP20X_IRQ(DIE_TEMP_HIGH, 2, 7),
93 AXP20X_IRQ(CHARG_I_LOW, 2, 6),
94 AXP20X_IRQ(DCDC1_V_LONG, 2, 5),
95 AXP20X_IRQ(DCDC2_V_LONG, 2, 4),
96 AXP20X_IRQ(DCDC3_V_LONG, 2, 3),
97 AXP20X_IRQ(PEK_SHORT, 2, 1),
98 AXP20X_IRQ(PEK_LONG, 2, 0),
99 AXP20X_IRQ(N_OE_PWR_ON, 3, 7),
100 AXP20X_IRQ(N_OE_PWR_OFF, 3, 6),
101 AXP20X_IRQ(VBUS_VALID, 3, 5),
102 AXP20X_IRQ(VBUS_NOT_VALID, 3, 4),
103 AXP20X_IRQ(VBUS_SESS_VALID, 3, 3),
104 AXP20X_IRQ(VBUS_SESS_END, 3, 2),
105 AXP20X_IRQ(LOW_PWR_LVL1, 3, 1),
106 AXP20X_IRQ(LOW_PWR_LVL2, 3, 0),
107 AXP20X_IRQ(TIMER, 4, 7),
108 AXP20X_IRQ(PEK_RIS_EDGE, 4, 6),
109 AXP20X_IRQ(PEK_FAL_EDGE, 4, 5),
110 AXP20X_IRQ(GPIO3_INPUT, 4, 3),
111 AXP20X_IRQ(GPIO2_INPUT, 4, 2),
112 AXP20X_IRQ(GPIO1_INPUT, 4, 1),
113 AXP20X_IRQ(GPIO0_INPUT, 4, 0),
114};
115
116static const struct of_device_id axp20x_of_match[] = {
117 { .compatible = "x-powers,axp202", .data = (void *) AXP202_ID },
118 { .compatible = "x-powers,axp209", .data = (void *) AXP209_ID },
119 { },
120};
121MODULE_DEVICE_TABLE(of, axp20x_of_match);
122
123/*
124 * This is useless for OF-enabled devices, but it is needed by I2C subsystem
125 */
126static const struct i2c_device_id axp20x_i2c_id[] = {
127 { },
128};
129MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);
130
131static const struct regmap_irq_chip axp20x_regmap_irq_chip = {
132 .name = "axp20x_irq_chip",
133 .status_base = AXP20X_IRQ1_STATE,
134 .ack_base = AXP20X_IRQ1_STATE,
135 .mask_base = AXP20X_IRQ1_EN,
136 .num_regs = 5,
137 .irqs = axp20x_regmap_irqs,
138 .num_irqs = ARRAY_SIZE(axp20x_regmap_irqs),
139 .mask_invert = true,
140 .init_ack_masked = true,
141};
142
143static const char * const axp20x_supplies[] = {
144 "acin",
145 "vin2",
146 "vin3",
147 "ldo24in",
148 "ldo3in",
149 "ldo5in",
150};
151
152static struct mfd_cell axp20x_cells[] = {
153 {
154 .name = "axp20x-pek",
155 .num_resources = ARRAY_SIZE(axp20x_pek_resources),
156 .resources = axp20x_pek_resources,
157 }, {
158 .name = "axp20x-regulator",
159 .parent_supplies = axp20x_supplies,
160 .num_parent_supplies = ARRAY_SIZE(axp20x_supplies),
161 },
162};
163
164static struct axp20x_dev *axp20x_pm_power_off;
165static void axp20x_power_off(void)
166{
167 regmap_write(axp20x_pm_power_off->regmap, AXP20X_OFF_CTRL,
168 AXP20X_OFF);
169}
170
171static int axp20x_i2c_probe(struct i2c_client *i2c,
172 const struct i2c_device_id *id)
173{
174 struct axp20x_dev *axp20x;
175 const struct of_device_id *of_id;
176 int ret;
177
178 axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
179 if (!axp20x)
180 return -ENOMEM;
181
182 of_id = of_match_device(axp20x_of_match, &i2c->dev);
183 if (!of_id) {
184 dev_err(&i2c->dev, "Unable to setup AXP20X data\n");
185 return -ENODEV;
186 }
187 axp20x->variant = (long) of_id->data;
188
189 axp20x->i2c_client = i2c;
190 axp20x->dev = &i2c->dev;
191 dev_set_drvdata(axp20x->dev, axp20x);
192
193 axp20x->regmap = devm_regmap_init_i2c(i2c, &axp20x_regmap_config);
194 if (IS_ERR(axp20x->regmap)) {
195 ret = PTR_ERR(axp20x->regmap);
196 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
197 return ret;
198 }
199
200 ret = regmap_add_irq_chip(axp20x->regmap, i2c->irq,
201 IRQF_ONESHOT | IRQF_SHARED, -1,
202 &axp20x_regmap_irq_chip,
203 &axp20x->regmap_irqc);
204 if (ret) {
205 dev_err(&i2c->dev, "failed to add irq chip: %d\n", ret);
206 return ret;
207 }
208
209 ret = mfd_add_devices(axp20x->dev, -1, axp20x_cells,
210 ARRAY_SIZE(axp20x_cells), NULL, 0, NULL);
211
212 if (ret) {
213 dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
214 regmap_del_irq_chip(i2c->irq, axp20x->regmap_irqc);
215 return ret;
216 }
217
218 if (!pm_power_off) {
219 axp20x_pm_power_off = axp20x;
220 pm_power_off = axp20x_power_off;
221 }
222
223 dev_info(&i2c->dev, "AXP20X driver loaded\n");
224
225 return 0;
226}
227
228static int axp20x_i2c_remove(struct i2c_client *i2c)
229{
230 struct axp20x_dev *axp20x = i2c_get_clientdata(i2c);
231
232 if (axp20x == axp20x_pm_power_off) {
233 axp20x_pm_power_off = NULL;
234 pm_power_off = NULL;
235 }
236
237 mfd_remove_devices(axp20x->dev);
238 regmap_del_irq_chip(axp20x->i2c_client->irq, axp20x->regmap_irqc);
239
240 return 0;
241}
242
243static struct i2c_driver axp20x_i2c_driver = {
244 .driver = {
245 .name = "axp20x",
246 .owner = THIS_MODULE,
247 .of_match_table = of_match_ptr(axp20x_of_match),
248 },
249 .probe = axp20x_i2c_probe,
250 .remove = axp20x_i2c_remove,
251 .id_table = axp20x_i2c_id,
252};
253
254module_i2c_driver(axp20x_i2c_driver);
255
256MODULE_DESCRIPTION("PMIC MFD core driver for AXP20X");
257MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
258MODULE_LICENSE("GPL");