1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arizona-spi.c -- Arizona SPI bus interface
4 *
5 * Copyright 2012 Wolfson Microelectronics plc
6 *
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 */
9
10 #include <linux/acpi.h>
11 #include <linux/err.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/gpio/machine.h>
14 #include <linux/module.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/regmap.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/slab.h>
19 #include <linux/spi/spi.h>
20 #include <linux/of.h>
21 #include <uapi/linux/input-event-codes.h>
22
23 #include <linux/mfd/arizona/core.h>
24
25 #include "arizona.h"
26
27 #ifdef CONFIG_ACPI
28 static const struct acpi_gpio_params reset_gpios = { 1, 0, false };
29 static const struct acpi_gpio_params ldoena_gpios = { 2, 0, false };
30
31 static const struct acpi_gpio_mapping arizona_acpi_gpios[] = {
32 { "reset-gpios", &reset_gpios, 1, },
33 { "wlf,ldoena-gpios", &ldoena_gpios, 1 },
34 { }
35 };
36
37 /*
38 * The ACPI resources for the device only describe external GPIO-s. They do
39 * not provide mappings for the GPIO-s coming from the Arizona codec itself.
40 */
41 static const struct gpiod_lookup arizona_soc_gpios[] = {
42 { "arizona", 2, "wlf,spkvdd-ena", 0, GPIO_ACTIVE_HIGH },
43 { "arizona", 4, "wlf,micd-pol", 0, GPIO_ACTIVE_LOW },
44 };
45
46 /*
47 * The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
48 * Function A Play/Pause: 0 ohm
49 * Function D Voice assistant: 135 ohm
50 * Function B Volume Up 240 ohm
51 * Function C Volume Down 470 ohm
52 * Minimum Mic DC resistance 1000 ohm
53 * Minimum Ear speaker impedance 16 ohm
54 * Note the first max value below must be less then the min. speaker impedance,
55 * to allow CTIA/OMTP detection to work. The other max values are the closest
56 * value from extcon-arizona.c:arizona_micd_levels halfway 2 button resistances.
57 */
58 static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {
59 { .max = 11, .key = KEY_PLAYPAUSE },
60 { .max = 186, .key = KEY_VOICECOMMAND },
61 { .max = 348, .key = KEY_VOLUMEUP },
62 { .max = 752, .key = KEY_VOLUMEDOWN },
63 };
64
arizona_spi_acpi_remove_lookup(void * lookup)65 static void arizona_spi_acpi_remove_lookup(void *lookup)
66 {
67 gpiod_remove_lookup_table(lookup);
68 }
69
arizona_spi_acpi_probe(struct arizona * arizona)70 static int arizona_spi_acpi_probe(struct arizona *arizona)
71 {
72 struct gpiod_lookup_table *lookup;
73 acpi_status status;
74 int ret;
75
76 /* Add mappings for the 2 ACPI declared GPIOs used for reset and ldo-ena */
77 devm_acpi_dev_add_driver_gpios(arizona->dev, arizona_acpi_gpios);
78
79 /* Add lookups for the SoCs own GPIOs used for micdet-polarity and spkVDD-enable */
80 lookup = devm_kzalloc(arizona->dev,
81 struct_size(lookup, table, ARRAY_SIZE(arizona_soc_gpios) + 1),
82 GFP_KERNEL);
83 if (!lookup)
84 return -ENOMEM;
85
86 lookup->dev_id = dev_name(arizona->dev);
87 memcpy(lookup->table, arizona_soc_gpios, sizeof(arizona_soc_gpios));
88
89 gpiod_add_lookup_table(lookup);
90 ret = devm_add_action_or_reset(arizona->dev, arizona_spi_acpi_remove_lookup, lookup);
91 if (ret)
92 return ret;
93
94 /* Enable 32KHz clock from SoC to codec for jack-detect */
95 status = acpi_evaluate_object(ACPI_HANDLE(arizona->dev), "CLKE", NULL, NULL);
96 if (ACPI_FAILURE(status))
97 dev_warn(arizona->dev, "Failed to enable 32KHz clk ACPI error %d\n", status);
98
99 /*
100 * Some DSDTs wrongly declare the IRQ trigger-type as IRQF_TRIGGER_FALLING
101 * The IRQ line will stay low when a new IRQ event happens between reading
102 * the IRQ status flags and acknowledging them. When the IRQ line stays
103 * low like this the IRQ will never trigger again when its type is set
104 * to IRQF_TRIGGER_FALLING. Correct the IRQ trigger-type to fix this.
105 *
106 * Note theoretically it is possible that some boards are not capable
107 * of handling active low level interrupts. In that case setting the
108 * flag to IRQF_TRIGGER_FALLING would not be a bug (and we would need
109 * to work around this) but so far all known usages of IRQF_TRIGGER_FALLING
110 * are a bug in the board's DSDT.
111 */
112 arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
113
114 /* Wait 200 ms after jack insertion */
115 arizona->pdata.micd_detect_debounce = 200;
116
117 /* Use standard AOSP values for headset-button mappings */
118 arizona->pdata.micd_ranges = arizona_micd_aosp_ranges;
119 arizona->pdata.num_micd_ranges = ARRAY_SIZE(arizona_micd_aosp_ranges);
120
121 return 0;
122 }
123
124 static const struct acpi_device_id arizona_acpi_match[] = {
125 {
126 .id = "WM510204",
127 .driver_data = WM5102,
128 },
129 {
130 .id = "WM510205",
131 .driver_data = WM5102,
132 },
133 { }
134 };
135 MODULE_DEVICE_TABLE(acpi, arizona_acpi_match);
136 #else
arizona_spi_acpi_probe(struct arizona * arizona)137 static int arizona_spi_acpi_probe(struct arizona *arizona)
138 {
139 return -ENODEV;
140 }
141 #endif
142
arizona_spi_probe(struct spi_device * spi)143 static int arizona_spi_probe(struct spi_device *spi)
144 {
145 const struct spi_device_id *id = spi_get_device_id(spi);
146 const void *match_data;
147 struct arizona *arizona;
148 const struct regmap_config *regmap_config = NULL;
149 unsigned long type = 0;
150 int ret;
151
152 match_data = device_get_match_data(&spi->dev);
153 if (match_data)
154 type = (unsigned long)match_data;
155 else if (id)
156 type = id->driver_data;
157
158 switch (type) {
159 case WM5102:
160 if (IS_ENABLED(CONFIG_MFD_WM5102))
161 regmap_config = &wm5102_spi_regmap;
162 break;
163 case WM5110:
164 case WM8280:
165 if (IS_ENABLED(CONFIG_MFD_WM5110))
166 regmap_config = &wm5110_spi_regmap;
167 break;
168 case WM1831:
169 case CS47L24:
170 if (IS_ENABLED(CONFIG_MFD_CS47L24))
171 regmap_config = &cs47l24_spi_regmap;
172 break;
173 default:
174 dev_err(&spi->dev, "Unknown device type %ld\n", type);
175 return -EINVAL;
176 }
177
178 if (!regmap_config) {
179 dev_err(&spi->dev,
180 "No kernel support for device type %ld\n", type);
181 return -EINVAL;
182 }
183
184 arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
185 if (arizona == NULL)
186 return -ENOMEM;
187
188 arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
189 if (IS_ERR(arizona->regmap)) {
190 ret = PTR_ERR(arizona->regmap);
191 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
192 ret);
193 return ret;
194 }
195
196 arizona->type = type;
197 arizona->dev = &spi->dev;
198 arizona->irq = spi->irq;
199
200 if (has_acpi_companion(&spi->dev)) {
201 ret = arizona_spi_acpi_probe(arizona);
202 if (ret)
203 return ret;
204 }
205
206 return arizona_dev_init(arizona);
207 }
208
arizona_spi_remove(struct spi_device * spi)209 static int arizona_spi_remove(struct spi_device *spi)
210 {
211 struct arizona *arizona = spi_get_drvdata(spi);
212
213 arizona_dev_exit(arizona);
214
215 return 0;
216 }
217
218 static const struct spi_device_id arizona_spi_ids[] = {
219 { "wm5102", WM5102 },
220 { "wm5110", WM5110 },
221 { "wm8280", WM8280 },
222 { "wm1831", WM1831 },
223 { "cs47l24", CS47L24 },
224 { },
225 };
226 MODULE_DEVICE_TABLE(spi, arizona_spi_ids);
227
228 static struct spi_driver arizona_spi_driver = {
229 .driver = {
230 .name = "arizona",
231 .pm = &arizona_pm_ops,
232 .of_match_table = of_match_ptr(arizona_of_match),
233 .acpi_match_table = ACPI_PTR(arizona_acpi_match),
234 },
235 .probe = arizona_spi_probe,
236 .remove = arizona_spi_remove,
237 .id_table = arizona_spi_ids,
238 };
239
240 module_spi_driver(arizona_spi_driver);
241
242 MODULE_SOFTDEP("pre: arizona_ldo1");
243 MODULE_DESCRIPTION("Arizona SPI bus interface");
244 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
245 MODULE_LICENSE("GPL");
246
