1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (c) 2025, Qualcomm Technologies, Inc. and/or its subsidiaries.
3
4#include <linux/export.h>
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/device.h>
8#include <linux/of.h>
9#include <linux/printk.h>
10#include <linux/component.h>
11#include <linux/pm_runtime.h>
12#include <linux/soundwire/sdw.h>
13#include <linux/soundwire/sdw_type.h>
14#include <linux/regmap.h>
15
16#include "wcd-common.h"
17
18#define WCD_MIN_MICBIAS_MV 1000
19#define WCD_DEF_MICBIAS_MV 1800
20#define WCD_MAX_MICBIAS_MV 2850
21
22#define SWRS_SCP_HOST_CLK_DIV2_CTL_BANK(m) (0xE0 + 0x10 * (m))
23
24int wcd_get_micb_vout_ctl_val(struct device *dev, u32 micb_mv)
25{
26 /* min micbias voltage is 1V and maximum is 2.85V */
27 if (micb_mv < WCD_MIN_MICBIAS_MV || micb_mv > WCD_MAX_MICBIAS_MV) {
28 dev_err(dev, "Unsupported micbias voltage (%u mV)\n", micb_mv);
29 return -EINVAL;
30 }
31
32 return (micb_mv - WCD_MIN_MICBIAS_MV) / 50;
33}
34EXPORT_SYMBOL_GPL(wcd_get_micb_vout_ctl_val);
35
36static int wcd_get_micbias_val(struct device *dev, int micb_num, u32 *micb_mv)
37{
38 char micbias[64];
39 int mv;
40
41 sprintf(buf: micbias, fmt: "qcom,micbias%d-microvolt", micb_num);
42
43 if (of_property_read_u32(np: dev->of_node, propname: micbias, out_value: &mv)) {
44 dev_err(dev, "%s value not found, using default\n", micbias);
45 mv = WCD_DEF_MICBIAS_MV;
46 } else {
47 /* convert it to milli volts */
48 mv = mv/1000;
49 }
50 if (micb_mv)
51 *micb_mv = mv;
52
53 mv = wcd_get_micb_vout_ctl_val(dev, mv);
54 if (mv < 0) {
55 dev_err(dev, "Unsupported %s voltage (%d mV), falling back to default (%d mV)\n",
56 micbias, mv, WCD_DEF_MICBIAS_MV);
57 return wcd_get_micb_vout_ctl_val(dev, WCD_DEF_MICBIAS_MV);
58 }
59
60 return mv;
61}
62
63int wcd_dt_parse_micbias_info(struct wcd_common *common)
64{
65 int ret, i;
66
67 for (i = 0; i < common->max_bias; i++) {
68 ret = wcd_get_micbias_val(dev: common->dev, micb_num: i + 1, micb_mv: &common->micb_mv[i]);
69 if (ret < 0)
70 return ret;
71 common->micb_vout[i] = ret;
72 }
73
74 return 0;
75}
76EXPORT_SYMBOL_GPL(wcd_dt_parse_micbias_info);
77
78static int wcd_sdw_component_bind(struct device *dev, struct device *master, void *data)
79{
80 pm_runtime_set_autosuspend_delay(dev, delay: 3000);
81 pm_runtime_use_autosuspend(dev);
82 pm_runtime_mark_last_busy(dev);
83 pm_runtime_set_active(dev);
84 pm_runtime_enable(dev);
85
86 return 0;
87}
88
89static void wcd_sdw_component_unbind(struct device *dev, struct device *master, void *data)
90{
91 pm_runtime_disable(dev);
92 pm_runtime_set_suspended(dev);
93 pm_runtime_dont_use_autosuspend(dev);
94}
95
96const struct component_ops wcd_sdw_component_ops = {
97 .bind = wcd_sdw_component_bind,
98 .unbind = wcd_sdw_component_unbind,
99};
100EXPORT_SYMBOL_GPL(wcd_sdw_component_ops);
101
102int wcd_update_status(struct sdw_slave *slave, enum sdw_slave_status status)
103{
104 struct regmap *regmap = dev_get_regmap(dev: &slave->dev, NULL);
105
106 if (regmap && status == SDW_SLAVE_ATTACHED) {
107 /* Write out any cached changes that happened between probe and attach */
108 regcache_cache_only(map: regmap, enable: false);
109 return regcache_sync(map: regmap);
110 }
111
112 return 0;
113}
114EXPORT_SYMBOL_GPL(wcd_update_status);
115
116int wcd_bus_config(struct sdw_slave *slave, struct sdw_bus_params *params)
117{
118 sdw_write(slave, SWRS_SCP_HOST_CLK_DIV2_CTL_BANK(params->next_bank), value: 0x01);
119
120 return 0;
121}
122EXPORT_SYMBOL_GPL(wcd_bus_config);
123
124int wcd_interrupt_callback(struct sdw_slave *slave, struct irq_domain *slave_irq,
125 unsigned int wcd_intr_status0, unsigned int wcd_intr_status1,
126 unsigned int wcd_intr_status2)
127{
128 struct regmap *regmap = dev_get_regmap(dev: &slave->dev, NULL);
129 u32 sts1, sts2, sts3;
130
131 do {
132 handle_nested_irq(irq: irq_find_mapping(domain: slave_irq, hwirq: 0));
133 regmap_read(map: regmap, reg: wcd_intr_status0, val: &sts1);
134 regmap_read(map: regmap, reg: wcd_intr_status1, val: &sts2);
135 regmap_read(map: regmap, reg: wcd_intr_status2, val: &sts3);
136
137 } while (sts1 || sts2 || sts3);
138
139 return IRQ_HANDLED;
140}
141EXPORT_SYMBOL_GPL(wcd_interrupt_callback);
142
143MODULE_DESCRIPTION("Common Qualcomm WCD Codec helpers driver");
144MODULE_LICENSE("GPL");
145

source code of linux/sound/soc/codecs/wcd-common.c