/* * wm8994-core.c -- Device access for Wolfson WM8994 * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int wm8994_read(struct wm8994 *wm8994, unsigned short reg, int bytes, void *dest) { return regmap_raw_read(wm8994->regmap, reg, dest, bytes); } /** * wm8994_reg_read: Read a single WM8994 register. * * @wm8994: Device to read from. * @reg: Register to read. */ int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg) { unsigned int val; int ret; ret = regmap_read(wm8994->regmap, reg, &val); if (ret < 0) return ret; else return val; } EXPORT_SYMBOL_GPL(wm8994_reg_read); /** * wm8994_bulk_read: Read multiple WM8994 registers * * @wm8994: Device to read from * @reg: First register * @count: Number of registers * @buf: Buffer to fill. The data will be returned big endian. */ int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg, int count, u16 *buf) { return regmap_bulk_read(wm8994->regmap, reg, buf, count); } static int wm8994_write(struct wm8994 *wm8994, unsigned short reg, int bytes, const void *src) { return regmap_raw_write(wm8994->regmap, reg, src, bytes); } /** * wm8994_reg_write: Write a single WM8994 register. * * @wm8994: Device to write to. * @reg: Register to write to. * @val: Value to write. */ int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg, unsigned short val) { return regmap_write(wm8994->regmap, reg, val); } EXPORT_SYMBOL_GPL(wm8994_reg_write); /** * wm8994_bulk_write: Write multiple WM8994 registers * * @wm8994: Device to write to * @reg: First register * @count: Number of registers * @buf: Buffer to write from. Data must be big-endian formatted. */ int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg, int count, const u16 *buf) { return regmap_raw_write(wm8994->regmap, reg, buf, count * sizeof(u16)); } EXPORT_SYMBOL_GPL(wm8994_bulk_write); /** * wm8994_set_bits: Set the value of a bitfield in a WM8994 register * * @wm8994: Device to write to. * @reg: Register to write to. * @mask: Mask of bits to set. * @val: Value to set (unshifted) */ int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg, unsigned short mask, unsigned short val) { return regmap_update_bits(wm8994->regmap, reg, mask, val); } EXPORT_SYMBOL_GPL(wm8994_set_bits); static struct mfd_cell wm8994_regulator_devs[] = { { .name = "wm8994-ldo", .id = 1, .pm_runtime_no_callbacks = true, }, { .name = "wm8994-ldo", .id = 2, .pm_runtime_no_callbacks = true, }, }; static struct resource wm8994_codec_resources[] = { { .start = WM8994_IRQ_TEMP_SHUT, .end = WM8994_IRQ_TEMP_WARN, .flags = IORESOURCE_IRQ, }, }; static struct resource wm8994_gpio_resources[] = { { .start = WM8994_IRQ_GPIO(1), .end = WM8994_IRQ_GPIO(11), .flags = IORESOURCE_IRQ, }, }; static struct mfd_cell wm8994_devs[] = { { .name = "wm8994-codec", .num_resources = ARRAY_SIZE(wm8994_codec_resources), .resources = wm8994_codec_resources, }, { .name = "wm8994-gpio", .num_resources = ARRAY_SIZE(wm8994_gpio_resources), .resources = wm8994_gpio_resources, .pm_runtime_no_callbacks = true, }, }; /* * Supplies for the main bulk of CODEC; the LDO supplies are ignored * and should be handled via the standard regulator API supply * management. */ static const char *wm1811_main_supplies[] = { "DBVDD1", "DBVDD2", "DBVDD3", "DCVDD", "AVDD1", "AVDD2", "CPVDD", "SPKVDD1", "SPKVDD2", }; static const char *wm8994_main_supplies[] = { "DBVDD", "DCVDD", "AVDD1", "AVDD2", "CPVDD", "SPKVDD1", "SPKVDD2", }; static const char *wm8958_main_supplies[] = { "DBVDD1", "DBVDD2", "DBVDD3", "DCVDD", "AVDD1", "AVDD2", "CPVDD", "SPKVDD1", "SPKVDD2", }; #ifdef CONFIG_PM static int wm8994_suspend(struct device *dev) { struct wm8994 *wm8994 = dev_get_drvdata(dev); int ret; /* Don't actually go through with the suspend if the CODEC is * still active (eg, for audio passthrough from CP. */ ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_1); if (ret < 0) { dev_err(dev, "Failed to read power status: %d\n", ret); } else if (ret & WM8994_VMID_SEL_MASK) { dev_dbg(dev, "CODEC still active, ignoring suspend\n"); return 0; } ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_4); if (ret < 0) { dev_err(dev, "Failed to read power status: %d\n", ret); } else if (ret & (WM8994_AIF2ADCL_ENA | WM8994_AIF2ADCR_ENA | WM8994_AIF1ADC2L_ENA | WM8994_AIF1ADC2R_ENA | WM8994_AIF1ADC1L_ENA | WM8994_AIF1ADC1R_ENA)) { dev_dbg(dev, "CODEC still active, ignoring suspend\n"); return 0; } ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_5); if (ret < 0) { dev_err(dev, "Failed to read power status: %d\n", ret); } else if (ret & (WM8994_AIF2DACL_ENA | WM8994_AIF2DACR_ENA | WM8994_AIF1DAC2L_ENA | WM8994_AIF1DAC2R_ENA | WM8994_AIF1DAC1L_ENA | WM8994_AIF1DAC1R_ENA)) { dev_dbg(dev, "CODEC still active, ignoring suspend\n"); return 0; } switch (wm8994->type) { case WM8958: ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1); if (ret < 0) { dev_err(dev, "Failed to read power status: %d\n", ret); } else if (ret & WM8958_MICD_ENA) { dev_dbg(dev, "CODEC still active, ignoring suspend\n"); return 0; } break; default: break; } /* Disable LDO pulldowns while the device is suspended if we * don't know that something will be driving them. */ if (!wm8994->ldo_ena_always_driven) wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD, WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD); /* GPIO configuration state is saved here since we may be configuring * the GPIO alternate functions even if we're not using the gpiolib * driver for them. */ ret = wm8994_read(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2, &wm8994->gpio_regs); if (ret < 0) dev_err(dev, "Failed to save GPIO registers: %d\n", ret); /* For similar reasons we also stash the regulator states */ ret = wm8994_read(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2, &wm8994->ldo_regs); if (ret < 0) dev_err(dev, "Failed to save LDO registers: %d\n", ret); /* Explicitly put the device into reset in case regulators * don't get disabled in order to ensure consistent restart. */ wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET, 0x8994); wm8994->suspended = true; ret = regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies); if (ret != 0) { dev_err(dev, "Failed to disable supplies: %d\n", ret); return ret; } return 0; } static int wm8994_resume(struct device *dev) { struct wm8994 *wm8994 = dev_get_drvdata(dev); int ret, i; /* We may have lied to the PM core about suspending */ if (!wm8994->suspended) return 0; ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies); if (ret != 0) { dev_err(dev, "Failed to enable supplies: %d\n", ret); return ret; } /* Write register at a time as we use the cache on the CPU so store * it in native endian. */ for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) { ret = wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK + i, wm8994->irq_masks_cur[i]); if (ret < 0) dev_err(dev, "Failed to restore interrupt masks: %d\n", ret); } ret = wm8994_write(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2, &wm8994->ldo_regs); if (ret < 0) dev_err(dev, "Failed to restore LDO registers: %d\n", ret); ret = wm8994_write(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2, &wm8994->gpio_regs); if (ret < 0) dev_err(dev, "Failed to restore GPIO registers: %d\n", ret); /* Disable LDO pulldowns while the device is active */ wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD, 0); wm8994->suspended = false; return 0; } #endif #ifdef CONFIG_REGULATOR static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) { struct wm8994_ldo_pdata *ldo_pdata; if (!pdata) return 0; ldo_pdata = &pdata->ldo[ldo]; if (!ldo_pdata->init_data) return 0; return ldo_pdata->init_data->num_consumer_supplies != 0; } #else static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) { return 0; } #endif static struct regmap_config wm8994_regmap_config = { .reg_bits = 16, .val_bits = 16, }; /* * Instantiate the generic non-control parts of the device. */ static int wm8994_device_init(struct wm8994 *wm8994, int irq) { struct wm8994_pdata *pdata = wm8994->dev->platform_data; const char *devname; int ret, i; dev_set_drvdata(wm8994->dev, wm8994); /* Add the on-chip regulators first for bootstrapping */ ret = mfd_add_devices(wm8994->dev, -1, wm8994_regulator_devs, ARRAY_SIZE(wm8994_regulator_devs), NULL, 0); if (ret != 0) { dev_err(wm8994->dev, "Failed to add children: %d\n", ret); goto err_regmap; } switch (wm8994->type) { case WM1811: wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies); break; case WM8994: wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies); break; case WM8958: wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies); break; default: BUG(); goto err_regmap; } wm8994->supplies = kzalloc(sizeof(struct regulator_bulk_data) * wm8994->num_supplies, GFP_KERNEL); if (!wm8994->supplies) { ret = -ENOMEM; goto err_regmap; } switch (wm8994->type) { case WM1811: for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++) wm8994->supplies[i].supply = wm1811_main_supplies[i]; break; case WM8994: for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++) wm8994->supplies[i].supply = wm8994_main_supplies[i]; break; case WM8958: for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++) wm8994->supplies[i].supply = wm8958_main_supplies[i]; break; default: BUG(); goto err_regmap; } ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies, wm8994->supplies); if (ret != 0) { dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret); goto err_supplies; } ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies); if (ret != 0) { dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret); goto err_get; } ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET); if (ret < 0) { dev_err(wm8994->dev, "Failed to read ID register\n"); goto err_enable; } switch (ret) { case 0x1811: devname = "WM1811"; if (wm8994->type != WM1811) dev_warn(wm8994->dev, "Device registered as type %d\n", wm8994->type); wm8994->type = WM1811; break; case 0x8994: devname = "WM8994"; if (wm8994->type != WM8994) dev_warn(wm8994->dev, "Device registered as type %d\n", wm8994->type); wm8994->type = WM8994; break; case 0x8958: devname = "WM8958"; if (wm8994->type != WM8958) dev_warn(wm8994->dev, "Device registered as type %d\n", wm8994->type); wm8994->type = WM8958; break; default: dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n", ret); ret = -EINVAL; goto err_enable; } ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION); if (ret < 0) { dev_err(wm8994->dev, "Failed to read revision register: %d\n", ret); goto err_enable; } switch (wm8994->type) { case WM8994: switch (ret) { case 0: case 1: dev_warn(wm8994->dev, "revision %c not fully supported\n", 'A' + ret); break; default: break; } break; default: break; } dev_info(wm8994->dev, "%s revision %c\n", devname, 'A' + ret); if (pdata) { wm8994->irq_base = pdata->irq_base; wm8994->gpio_base = pdata->gpio_base; /* GPIO configuration is only applied if it's non-zero */ for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) { if (pdata->gpio_defaults[i]) { wm8994_set_bits(wm8994, WM8994_GPIO_1 + i, 0xffff, pdata->gpio_defaults[i]); } } wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven; } /* Disable LDO pulldowns while the device is active */ wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD, 0); /* In some system designs where the regulators are not in use, * we can achieve a small reduction in leakage currents by * floating LDO outputs. This bit makes no difference if the * LDOs are enabled, it only affects cases where the LDOs were * in operation and are then disabled. */ for (i = 0; i < WM8994_NUM_LDO_REGS; i++) { if (wm8994_ldo_in_use(pdata, i)) wm8994_set_bits(wm8994, WM8994_LDO_1 + i, WM8994_LDO1_DISCH, WM8994_LDO1_DISCH); else wm8994_set_bits(wm8994, WM8994_LDO_1 + i, WM8994_LDO1_DISCH, 0); } wm8994_irq_init(wm8994); ret = mfd_add_devices(wm8994->dev, -1, wm8994_devs, ARRAY_SIZE(wm8994_devs), NULL, 0); if (ret != 0) { dev_err(wm8994->dev, "Failed to add children: %d\n", ret); goto err_irq; } pm_runtime_enable(wm8994->dev); pm_runtime_resume(wm8994->dev); return 0; err_irq: wm8994_irq_exit(wm8994); err_enable: regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies); err_get: regulator_bulk_free(wm8994->num_supplies, wm8994->supplies); err_supplies: kfree(wm8994->supplies); err_regmap: regmap_exit(wm8994->regmap); mfd_remove_devices(wm8994->dev); kfree(wm8994); return ret; } static void wm8994_device_exit(struct wm8994 *wm8994) { pm_runtime_disable(wm8994->dev); mfd_remove_devices(wm8994->dev); wm8994_irq_exit(wm8994); regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies); regulator_bulk_free(wm8994->num_supplies, wm8994->supplies); kfree(wm8994->supplies); regmap_exit(wm8994->regmap); kfree(wm8994); } static int wm8994_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct wm8994 *wm8994; int ret; wm8994 = kzalloc(sizeof(struct wm8994), GFP_KERNEL); if (wm8994 == NULL) return -ENOMEM; i2c_set_clientdata(i2c, wm8994); wm8994->dev = &i2c->dev; wm8994->irq = i2c->irq; wm8994->type = id->driver_data; wm8994->regmap = regmap_init_i2c(i2c, &wm8994_regmap_config); if (IS_ERR(wm8994->regmap)) { ret = PTR_ERR(wm8994->regmap); dev_err(wm8994->dev, "Failed to allocate register map: %d\n", ret); kfree(wm8994); return ret; } return wm8994_device_init(wm8994, i2c->irq); } static int wm8994_i2c_remove(struct i2c_client *i2c) { struct wm8994 *wm8994 = i2c_get_clientdata(i2c); wm8994_device_exit(wm8994); return 0; } static const struct i2c_device_id wm8994_i2c_id[] = { { "wm1811", WM1811 }, { "wm8994", WM8994 }, { "wm8958", WM8958 }, { } }; MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id); static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume, NULL); static struct i2c_driver wm8994_i2c_driver = { .driver = { .name = "wm8994", .owner = THIS_MODULE, .pm = &wm8994_pm_ops, }, .probe = wm8994_i2c_probe, .remove = wm8994_i2c_remove, .id_table = wm8994_i2c_id, }; static int __init wm8994_i2c_init(void) { int ret; ret = i2c_add_driver(&wm8994_i2c_driver); if (ret != 0) pr_err("Failed to register wm8994 I2C driver: %d\n", ret); return ret; } module_init(wm8994_i2c_init); static void __exit wm8994_i2c_exit(void) { i2c_del_driver(&wm8994_i2c_driver); } module_exit(wm8994_i2c_exit); MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Mark Brown ");