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kernel/drivers/mfd/wcd934x.c

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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019, Linaro Limited
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/mfd/wcd934x/registers.h>
#include <linux/mfd/wcd934x/wcd934x.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slimbus.h>
#define WCD934X_REGMAP_IRQ_REG(_irq, _off, _mask) \
[_irq] = { \
.reg_offset = (_off), \
.mask = (_mask), \
.type = { \
.type_reg_offset = (_off), \
.types_supported = IRQ_TYPE_EDGE_BOTH, \
.type_reg_mask = (_mask), \
.type_level_low_val = (_mask), \
.type_level_high_val = (_mask), \
.type_falling_val = 0, \
.type_rising_val = 0, \
}, \
}
static const struct mfd_cell wcd934x_devices[] = {
{
.name = "wcd934x-codec",
}, {
.name = "wcd934x-gpio",
.of_compatible = "qcom,wcd9340-gpio",
}, {
.name = "wcd934x-soundwire",
.of_compatible = "qcom,soundwire-v1.3.0",
},
};
static const struct regmap_irq wcd934x_irqs[] = {
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SLIMBUS, 0, BIT(0)),
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPL_FAULT, 0, BIT(2)),
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_HPH_PA_OCPR_FAULT, 0, BIT(3)),
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_SW_DET, 1, BIT(0)),
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_DET, 1, BIT(1)),
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_PRESS_DET, 1, BIT(2)),
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_BUTTON_RELEASE_DET, 1, BIT(3)),
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_MBHC_ELECT_INS_REM_LEG_DET, 1, BIT(4)),
WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SOUNDWIRE, 2, BIT(4)),
};
static const struct regmap_irq_chip wcd934x_regmap_irq_chip = {
.name = "wcd934x_irq",
.status_base = WCD934X_INTR_PIN1_STATUS0,
.mask_base = WCD934X_INTR_PIN1_MASK0,
.ack_base = WCD934X_INTR_PIN1_CLEAR0,
.type_base = WCD934X_INTR_LEVEL0,
.num_type_reg = 4,
.type_in_mask = false,
.num_regs = 4,
.irqs = wcd934x_irqs,
.num_irqs = ARRAY_SIZE(wcd934x_irqs),
};
static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case WCD934X_INTR_PIN1_STATUS0...WCD934X_INTR_PIN2_CLEAR3:
case WCD934X_SWR_AHB_BRIDGE_RD_DATA_0:
case WCD934X_SWR_AHB_BRIDGE_RD_DATA_1:
case WCD934X_SWR_AHB_BRIDGE_RD_DATA_2:
case WCD934X_SWR_AHB_BRIDGE_RD_DATA_3:
case WCD934X_SWR_AHB_BRIDGE_ACCESS_STATUS:
case WCD934X_ANA_MBHC_RESULT_3:
case WCD934X_ANA_MBHC_RESULT_2:
case WCD934X_ANA_MBHC_RESULT_1:
case WCD934X_ANA_MBHC_MECH:
case WCD934X_ANA_MBHC_ELECT:
case WCD934X_ANA_MBHC_ZDET:
case WCD934X_ANA_MICB2:
case WCD934X_ANA_RCO:
case WCD934X_ANA_BIAS:
return true;
default:
return false;
}
};
static const struct regmap_range_cfg wcd934x_ranges[] = {
{ .name = "WCD934X",
.range_min = 0x0,
.range_max = WCD934X_MAX_REGISTER,
.selector_reg = WCD934X_SEL_REGISTER,
.selector_mask = WCD934X_SEL_MASK,
.selector_shift = WCD934X_SEL_SHIFT,
.window_start = WCD934X_WINDOW_START,
.window_len = WCD934X_WINDOW_LENGTH,
},
};
static struct regmap_config wcd934x_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.cache_type = REGCACHE_RBTREE,
.max_register = 0xffff,
.can_multi_write = true,
.ranges = wcd934x_ranges,
.num_ranges = ARRAY_SIZE(wcd934x_ranges),
.volatile_reg = wcd934x_is_volatile_register,
};
static int wcd934x_bring_up(struct wcd934x_ddata *ddata)
{
struct regmap *regmap = ddata->regmap;
u16 id_minor, id_major;
int ret;
ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE0,
(u8 *)&id_minor, sizeof(u16));
if (ret)
return ret;
ret = regmap_bulk_read(regmap, WCD934X_CHIP_TIER_CTRL_CHIP_ID_BYTE2,
(u8 *)&id_major, sizeof(u16));
if (ret)
return ret;
dev_info(ddata->dev, "WCD934x chip id major 0x%x, minor 0x%x\n",
id_major, id_minor);
regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x01);
regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_A_STARTUP, 0x19);
regmap_write(regmap, WCD934X_SIDO_NEW_VOUT_D_STARTUP, 0x15);
/* Add 1msec delay for VOUT to settle */
usleep_range(1000, 1100);
regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5);
regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x7);
regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x3);
regmap_write(regmap, WCD934X_CODEC_RPM_RST_CTL, 0x7);
regmap_write(regmap, WCD934X_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3);
return 0;
}
static int wcd934x_slim_status_up(struct slim_device *sdev)
{
struct device *dev = &sdev->dev;
struct wcd934x_ddata *ddata;
int ret;
ddata = dev_get_drvdata(dev);
ddata->regmap = regmap_init_slimbus(sdev, &wcd934x_regmap_config);
if (IS_ERR(ddata->regmap)) {
dev_err(dev, "Error allocating slim regmap\n");
return PTR_ERR(ddata->regmap);
}
ret = wcd934x_bring_up(ddata);
if (ret) {
dev_err(dev, "Failed to bring up WCD934X: err = %d\n", ret);
return ret;
}
ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
IRQF_TRIGGER_HIGH, 0,
&wcd934x_regmap_irq_chip,
&ddata->irq_data);
if (ret) {
dev_err(dev, "Failed to add IRQ chip: err = %d\n", ret);
return ret;
}
ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, wcd934x_devices,
ARRAY_SIZE(wcd934x_devices), NULL, 0, NULL);
if (ret) {
dev_err(dev, "Failed to add child devices: err = %d\n",
ret);
return ret;
}
return ret;
}
static int wcd934x_slim_status(struct slim_device *sdev,
enum slim_device_status status)
{
switch (status) {
case SLIM_DEVICE_STATUS_UP:
return wcd934x_slim_status_up(sdev);
case SLIM_DEVICE_STATUS_DOWN:
mfd_remove_devices(&sdev->dev);
break;
default:
return -EINVAL;
}
return 0;
}
static int wcd934x_slim_probe(struct slim_device *sdev)
{
struct device *dev = &sdev->dev;
struct device_node *np = dev->of_node;
struct wcd934x_ddata *ddata;
int reset_gpio, ret;
ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
ddata->irq = of_irq_get(np, 0);
if (ddata->irq < 0)
return dev_err_probe(ddata->dev, ddata->irq,
"Failed to get IRQ\n");
reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
if (reset_gpio < 0) {
dev_err(dev, "Failed to get reset gpio: err = %d\n",
reset_gpio);
return reset_gpio;
}
ddata->extclk = devm_clk_get(dev, "extclk");
if (IS_ERR(ddata->extclk)) {
dev_err(dev, "Failed to get extclk");
return PTR_ERR(ddata->extclk);
}
ddata->supplies[0].supply = "vdd-buck";
ddata->supplies[1].supply = "vdd-buck-sido";
ddata->supplies[2].supply = "vdd-tx";
ddata->supplies[3].supply = "vdd-rx";
ddata->supplies[4].supply = "vdd-io";
ret = regulator_bulk_get(dev, WCD934X_MAX_SUPPLY, ddata->supplies);
if (ret) {
dev_err(dev, "Failed to get supplies: err = %d\n", ret);
return ret;
}
ret = regulator_bulk_enable(WCD934X_MAX_SUPPLY, ddata->supplies);
if (ret) {
dev_err(dev, "Failed to enable supplies: err = %d\n", ret);
return ret;
}
/*
* For WCD934X, it takes about 600us for the Vout_A and
* Vout_D to be ready after BUCK_SIDO is powered up.
* SYS_RST_N shouldn't be pulled high during this time
*/
usleep_range(600, 650);
gpio_direction_output(reset_gpio, 0);
msleep(20);
gpio_set_value(reset_gpio, 1);
msleep(20);
ddata->dev = dev;
dev_set_drvdata(dev, ddata);
return 0;
}
static void wcd934x_slim_remove(struct slim_device *sdev)
{
struct wcd934x_ddata *ddata = dev_get_drvdata(&sdev->dev);
regulator_bulk_disable(WCD934X_MAX_SUPPLY, ddata->supplies);
mfd_remove_devices(&sdev->dev);
}
static const struct slim_device_id wcd934x_slim_id[] = {
{ SLIM_MANF_ID_QCOM, SLIM_PROD_CODE_WCD9340,
SLIM_DEV_IDX_WCD9340, SLIM_DEV_INSTANCE_ID_WCD9340 },
{}
};
static struct slim_driver wcd934x_slim_driver = {
.driver = {
.name = "wcd934x-slim",
},
.probe = wcd934x_slim_probe,
.remove = wcd934x_slim_remove,
.device_status = wcd934x_slim_status,
.id_table = wcd934x_slim_id,
};
module_slim_driver(wcd934x_slim_driver);
MODULE_DESCRIPTION("WCD934X slim driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("slim:217:250:*");
MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
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