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path: root/drivers/mfd/wm8994-core.c
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Diffstat (limited to 'drivers/mfd/wm8994-core.c')
-rw-r--r--drivers/mfd/wm8994-core.c698
1 files changed, 698 insertions, 0 deletions
diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
new file mode 100644
index 00000000..17dcc13a
--- /dev/null
+++ b/drivers/mfd/wm8994-core.c
@@ -0,0 +1,698 @@
+/*
+ * wm8994-core.c -- Device access for Wolfson WM8994
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/mfd/core.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/machine.h>
+
+#include <linux/mfd/wm8994/core.h>
+#include <linux/mfd/wm8994/pdata.h>
+#include <linux/mfd/wm8994/registers.h>
+
+static int wm8994_read(struct wm8994 *wm8994, unsigned short reg,
+ int bytes, void *dest)
+{
+ int ret, i;
+ u16 *buf = dest;
+
+ BUG_ON(bytes % 2);
+ BUG_ON(bytes <= 0);
+
+ ret = wm8994->read_dev(wm8994, reg, bytes, dest);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < bytes / 2; i++) {
+ dev_vdbg(wm8994->dev, "Read %04x from R%d(0x%x)\n",
+ be16_to_cpu(buf[i]), reg + i, reg + i);
+ }
+
+ return 0;
+}
+
+/**
+ * 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 short val;
+ int ret;
+
+ mutex_lock(&wm8994->io_lock);
+
+ ret = wm8994_read(wm8994, reg, 2, &val);
+
+ mutex_unlock(&wm8994->io_lock);
+
+ if (ret < 0)
+ return ret;
+ else
+ return be16_to_cpu(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)
+{
+ int ret;
+
+ mutex_lock(&wm8994->io_lock);
+
+ ret = wm8994_read(wm8994, reg, count * 2, buf);
+
+ mutex_unlock(&wm8994->io_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(wm8994_bulk_read);
+
+static int wm8994_write(struct wm8994 *wm8994, unsigned short reg,
+ int bytes, const void *src)
+{
+ const u16 *buf = src;
+ int i;
+
+ BUG_ON(bytes % 2);
+ BUG_ON(bytes <= 0);
+
+ for (i = 0; i < bytes / 2; i++) {
+ dev_vdbg(wm8994->dev, "Write %04x to R%d(0x%x)\n",
+ be16_to_cpu(buf[i]), reg + i, reg + i);
+ }
+
+ return wm8994->write_dev(wm8994, reg, bytes, src);
+}
+
+/**
+ * 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)
+{
+ int ret;
+
+ val = cpu_to_be16(val);
+
+ mutex_lock(&wm8994->io_lock);
+
+ ret = wm8994_write(wm8994, reg, 2, &val);
+
+ mutex_unlock(&wm8994->io_lock);
+
+ return ret;
+}
+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)
+{
+ int ret;
+
+ mutex_lock(&wm8994->io_lock);
+
+ ret = wm8994_write(wm8994, reg, count * 2, buf);
+
+ mutex_unlock(&wm8994->io_lock);
+
+ return ret;
+}
+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)
+{
+ int ret;
+ u16 r;
+
+ mutex_lock(&wm8994->io_lock);
+
+ ret = wm8994_read(wm8994, reg, 2, &r);
+ if (ret < 0)
+ goto out;
+
+ r = be16_to_cpu(r);
+
+ r &= ~mask;
+ r |= val;
+
+ r = cpu_to_be16(r);
+
+ ret = wm8994_write(wm8994, reg, 2, &r);
+
+out:
+ mutex_unlock(&wm8994->io_lock);
+
+ return ret;
+}
+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 *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;
+ }
+
+ /* 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;
+
+ /* 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;
+ }
+
+ ret = wm8994_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK,
+ WM8994_NUM_IRQ_REGS * 2, &wm8994->irq_masks_cur);
+ 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);
+
+ 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
+
+/*
+ * 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;
+
+ mutex_init(&wm8994->io_lock);
+ 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;
+ }
+
+ switch (wm8994->type) {
+ case WM8994:
+ wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
+ break;
+ case WM8958:
+ wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
+ break;
+ default:
+ BUG();
+ return -EINVAL;
+ }
+
+ wm8994->supplies = kzalloc(sizeof(struct regulator_bulk_data) *
+ wm8994->num_supplies,
+ GFP_KERNEL);
+ if (!wm8994->supplies) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ switch (wm8994->type) {
+ 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();
+ return -EINVAL;
+ }
+
+ 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 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 (ret) {
+ case 0:
+ case 1:
+ if (wm8994->type == WM8994)
+ dev_warn(wm8994->dev,
+ "revision %c not fully supported\n",
+ 'A' + ret);
+ 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]);
+ }
+ }
+ }
+
+ /* 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:
+ 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);
+ kfree(wm8994);
+}
+
+static int wm8994_i2c_read_device(struct wm8994 *wm8994, unsigned short reg,
+ int bytes, void *dest)
+{
+ struct i2c_client *i2c = wm8994->control_data;
+ int ret;
+ u16 r = cpu_to_be16(reg);
+
+ ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
+ if (ret < 0)
+ return ret;
+ if (ret != 2)
+ return -EIO;
+
+ ret = i2c_master_recv(i2c, dest, bytes);
+ if (ret < 0)
+ return ret;
+ if (ret != bytes)
+ return -EIO;
+ return 0;
+}
+
+static int wm8994_i2c_write_device(struct wm8994 *wm8994, unsigned short reg,
+ int bytes, const void *src)
+{
+ struct i2c_client *i2c = wm8994->control_data;
+ unsigned char msg[bytes + 2];
+ int ret;
+
+ reg = cpu_to_be16(reg);
+ memcpy(&msg[0], &reg, 2);
+ memcpy(&msg[2], src, bytes);
+
+ ret = i2c_master_send(i2c, msg, bytes + 2);
+ if (ret < 0)
+ return ret;
+ if (ret < bytes + 2)
+ return -EIO;
+
+#if 0
+ struct i2c_client *i2c = wm8994->control_data;
+ struct i2c_msg xfer[2];
+ int ret;
+
+ reg = cpu_to_be16(reg);
+
+ xfer[0].addr = i2c->addr;
+ xfer[0].flags = 0;
+ xfer[0].len = 2;
+ xfer[0].buf = (char *)&reg;
+
+ xfer[1].addr = i2c->addr;
+ xfer[1].flags = I2C_M_NOSTART;
+ xfer[1].len = bytes;
+ xfer[1].buf = (char *)src;
+
+ ret = i2c_transfer(i2c->adapter, xfer, 2);
+ if (ret < 0)
+ return ret;
+ if (ret != 2)
+ return -EIO;
+#endif
+ return 0;
+}
+
+static int wm8994_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct wm8994 *wm8994;
+
+ wm8994 = kzalloc(sizeof(struct wm8994), GFP_KERNEL);
+ if (wm8994 == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, wm8994);
+ wm8994->dev = &i2c->dev;
+ wm8994->control_data = i2c;
+ wm8994->read_dev = wm8994_i2c_read_device;
+ wm8994->write_dev = wm8994_i2c_write_device;
+ wm8994->irq = i2c->irq;
+ wm8994->type = id->driver_data;
+
+ 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[] = {
+ { "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 <broonie@opensource.wolfsonmicro.com>");
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-26 23:07:01 +0000