diff options
Diffstat (limited to 'drivers/mfd/arizona-spi.c')
| -rw-r--r-- | drivers/mfd/arizona-spi.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c new file mode 100644 index 000000000..3f83a77ce --- /dev/null +++ b/drivers/mfd/arizona-spi.c @@ -0,0 +1,303 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * arizona-spi.c -- Arizona SPI bus interface + * + * Copyright 2012 Wolfson Microelectronics plc + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + */ + +#include <linux/acpi.h> +#include <linux/err.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio/machine.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/of.h> +#include <uapi/linux/input-event-codes.h> + +#include <linux/mfd/arizona/core.h> + +#include "arizona.h" + +#ifdef CONFIG_ACPI +static const struct acpi_gpio_params reset_gpios = { 1, 0, false }; +static const struct acpi_gpio_params ldoena_gpios = { 2, 0, false }; + +static const struct acpi_gpio_mapping arizona_acpi_gpios[] = { + { "reset-gpios", &reset_gpios, 1, }, + { "wlf,ldoena-gpios", &ldoena_gpios, 1 }, + { } +}; + +/* + * The ACPI resources for the device only describe external GPIO-s. They do + * not provide mappings for the GPIO-s coming from the Arizona codec itself. + */ +static const struct gpiod_lookup arizona_soc_gpios[] = { + { "arizona", 2, "wlf,spkvdd-ena", 0, GPIO_ACTIVE_HIGH }, + { "arizona", 4, "wlf,micd-pol", 0, GPIO_ACTIVE_LOW }, +}; + +static void arizona_spi_acpi_remove_lookup(void *lookup) +{ + gpiod_remove_lookup_table(lookup); +} + +/* For ACPI tables from boards which ship with Windows as factory OS */ +static int arizona_spi_acpi_windows_probe(struct arizona *arizona) +{ + struct gpiod_lookup_table *lookup; + acpi_status status; + int ret; + + /* Add mappings for the 2 ACPI declared GPIOs used for reset and ldo-ena */ + devm_acpi_dev_add_driver_gpios(arizona->dev, arizona_acpi_gpios); + + /* Add lookups for the SoCs own GPIOs used for micdet-polarity and spkVDD-enable */ + lookup = devm_kzalloc(arizona->dev, + struct_size(lookup, table, ARRAY_SIZE(arizona_soc_gpios) + 1), + GFP_KERNEL); + if (!lookup) + return -ENOMEM; + + lookup->dev_id = dev_name(arizona->dev); + memcpy(lookup->table, arizona_soc_gpios, sizeof(arizona_soc_gpios)); + + gpiod_add_lookup_table(lookup); + ret = devm_add_action_or_reset(arizona->dev, arizona_spi_acpi_remove_lookup, lookup); + if (ret) + return ret; + + /* Enable 32KHz clock from SoC to codec for jack-detect */ + status = acpi_evaluate_object(ACPI_HANDLE(arizona->dev), "CLKE", NULL, NULL); + if (ACPI_FAILURE(status)) + dev_warn(arizona->dev, "Failed to enable 32KHz clk ACPI error %d\n", status); + + return 0; +} + +/* For ACPI tables from boards which ship with Android as factory OS */ +static int arizona_spi_acpi_android_probe(struct arizona *arizona) +{ + int ret; + + /* + * Get the reset GPIO, treating -ENOENT as -EPROBE_DEFER to wait for + * the x86-android-tablets module to register the board specific GPIO + * lookup table. + */ + arizona->pdata.reset = devm_gpiod_get(arizona->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(arizona->pdata.reset)) { + ret = PTR_ERR(arizona->pdata.reset); + if (ret == -ENOENT) { + dev_info_once(arizona->dev, + "Deferring probe till GPIO lookup is registered\n"); + ret = -EPROBE_DEFER; + } + return dev_err_probe(arizona->dev, ret, "getting reset GPIO\n"); + } + + return 0; +} + +/* + * The AOSP 3.5 mm Headset: Accessory Specification gives the following values: + * Function A Play/Pause: 0 ohm + * Function D Voice assistant: 135 ohm + * Function B Volume Up 240 ohm + * Function C Volume Down 470 ohm + * Minimum Mic DC resistance 1000 ohm + * Minimum Ear speaker impedance 16 ohm + * Note the first max value below must be less then the min. speaker impedance, + * to allow CTIA/OMTP detection to work. The other max values are the closest + * value from extcon-arizona.c:arizona_micd_levels halfway 2 button resistances. + */ +static const struct arizona_micd_range arizona_micd_aosp_ranges[] = { + { .max = 11, .key = KEY_PLAYPAUSE }, + { .max = 186, .key = KEY_VOICECOMMAND }, + { .max = 348, .key = KEY_VOLUMEUP }, + { .max = 752, .key = KEY_VOLUMEDOWN }, +}; + +static int arizona_spi_acpi_probe(struct arizona *arizona) +{ + struct acpi_device *adev = ACPI_COMPANION(arizona->dev); + int ret; + + if (acpi_dev_hid_uid_match(adev, "10WM5102", NULL)) + ret = arizona_spi_acpi_android_probe(arizona); + else + ret = arizona_spi_acpi_windows_probe(arizona); + + if (ret) + return ret; + + /* + * Some DSDTs wrongly declare the IRQ trigger-type as IRQF_TRIGGER_FALLING + * The IRQ line will stay low when a new IRQ event happens between reading + * the IRQ status flags and acknowledging them. When the IRQ line stays + * low like this the IRQ will never trigger again when its type is set + * to IRQF_TRIGGER_FALLING. Correct the IRQ trigger-type to fix this. + * + * Note theoretically it is possible that some boards are not capable + * of handling active low level interrupts. In that case setting the + * flag to IRQF_TRIGGER_FALLING would not be a bug (and we would need + * to work around this) but so far all known usages of IRQF_TRIGGER_FALLING + * are a bug in the board's DSDT. + */ + arizona->pdata.irq_flags = IRQF_TRIGGER_LOW; + + /* Wait 200 ms after jack insertion */ + arizona->pdata.micd_detect_debounce = 200; + + /* Use standard AOSP values for headset-button mappings */ + arizona->pdata.micd_ranges = arizona_micd_aosp_ranges; + arizona->pdata.num_micd_ranges = ARRAY_SIZE(arizona_micd_aosp_ranges); + + /* Use left headphone speaker for HP vs line-out detection */ + arizona->pdata.hpdet_channel = ARIZONA_ACCDET_MODE_HPL; + + return 0; +} + +static const struct acpi_device_id arizona_acpi_match[] = { + { + .id = "WM510204", + .driver_data = WM5102, + }, + { + .id = "WM510205", + .driver_data = WM5102, + }, + { + .id = "10WM5102", + .driver_data = WM5102, + }, + { } +}; +MODULE_DEVICE_TABLE(acpi, arizona_acpi_match); +#else +static int arizona_spi_acpi_probe(struct arizona *arizona) +{ + return -ENODEV; +} +#endif + +static int arizona_spi_probe(struct spi_device *spi) +{ + const struct spi_device_id *id = spi_get_device_id(spi); + const void *match_data; + struct arizona *arizona; + const struct regmap_config *regmap_config = NULL; + unsigned long type = 0; + int ret; + + match_data = device_get_match_data(&spi->dev); + if (match_data) + type = (unsigned long)match_data; + else if (id) + type = id->driver_data; + + switch (type) { + case WM5102: + if (IS_ENABLED(CONFIG_MFD_WM5102)) + regmap_config = &wm5102_spi_regmap; + break; + case WM5110: + case WM8280: + if (IS_ENABLED(CONFIG_MFD_WM5110)) + regmap_config = &wm5110_spi_regmap; + break; + case WM1831: + case CS47L24: + if (IS_ENABLED(CONFIG_MFD_CS47L24)) + regmap_config = &cs47l24_spi_regmap; + break; + default: + dev_err(&spi->dev, "Unknown device type %ld\n", type); + return -EINVAL; + } + + if (!regmap_config) { + dev_err(&spi->dev, + "No kernel support for device type %ld\n", type); + return -EINVAL; + } + + arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL); + if (arizona == NULL) + return -ENOMEM; + + arizona->regmap = devm_regmap_init_spi(spi, regmap_config); + if (IS_ERR(arizona->regmap)) { + ret = PTR_ERR(arizona->regmap); + dev_err(&spi->dev, "Failed to allocate register map: %d\n", + ret); + return ret; + } + + arizona->type = type; + arizona->dev = &spi->dev; + arizona->irq = spi->irq; + + if (has_acpi_companion(&spi->dev)) { + ret = arizona_spi_acpi_probe(arizona); + if (ret) + return ret; + } + + return arizona_dev_init(arizona); +} + +static void arizona_spi_remove(struct spi_device *spi) +{ + struct arizona *arizona = spi_get_drvdata(spi); + + arizona_dev_exit(arizona); +} + +static const struct spi_device_id arizona_spi_ids[] = { + { "wm5102", WM5102 }, + { "wm5110", WM5110 }, + { "wm8280", WM8280 }, + { "wm1831", WM1831 }, + { "cs47l24", CS47L24 }, + { }, +}; +MODULE_DEVICE_TABLE(spi, arizona_spi_ids); + +#ifdef CONFIG_OF +static const struct of_device_id arizona_spi_of_match[] = { + { .compatible = "wlf,wm5102", .data = (void *)WM5102 }, + { .compatible = "wlf,wm5110", .data = (void *)WM5110 }, + { .compatible = "wlf,wm8280", .data = (void *)WM8280 }, + { .compatible = "wlf,wm1831", .data = (void *)WM1831 }, + { .compatible = "cirrus,cs47l24", .data = (void *)CS47L24 }, + {}, +}; +MODULE_DEVICE_TABLE(of, arizona_spi_of_match); +#endif + +static struct spi_driver arizona_spi_driver = { + .driver = { + .name = "arizona", + .pm = &arizona_pm_ops, + .of_match_table = of_match_ptr(arizona_spi_of_match), + .acpi_match_table = ACPI_PTR(arizona_acpi_match), + }, + .probe = arizona_spi_probe, + .remove = arizona_spi_remove, + .id_table = arizona_spi_ids, +}; + +module_spi_driver(arizona_spi_driver); + +MODULE_SOFTDEP("pre: arizona_ldo1"); +MODULE_DESCRIPTION("Arizona SPI bus interface"); +MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); +MODULE_LICENSE("GPL"); |