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path: root/kernel/drivers/mfd/wm8994-core.c
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Diffstat (limited to 'kernel/drivers/mfd/wm8994-core.c')
-rw-r--r--kernel/drivers/mfd/wm8994-core.c693
1 files changed, 693 insertions, 0 deletions
diff --git a/kernel/drivers/mfd/wm8994-core.c b/kernel/drivers/mfd/wm8994-core.c
new file mode 100644
index 000000000..53ae5af5d
--- /dev/null
+++ b/kernel/drivers/mfd/wm8994-core.c
@@ -0,0 +1,693 @@
+/*
+ * 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/err.h>
+#include <linux/delay.h>
+#include <linux/mfd/core.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.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>
+
+#include "wm8994.h"
+
+static const struct mfd_cell wm8994_regulator_devs[] = {
+ {
+ .name = "wm8994-ldo",
+ .id = 0,
+ .pm_runtime_no_callbacks = true,
+ },
+ {
+ .name = "wm8994-ldo",
+ .id = 1,
+ .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 const 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 for accessory detect. */
+ switch (wm8994->type) {
+ case WM8958:
+ case WM1811:
+ 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);
+
+ /* 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,
+ wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
+
+ regcache_mark_dirty(wm8994->regmap);
+
+ /* Restore GPIO registers to prevent problems with mismatched
+ * pin configurations.
+ */
+ ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
+ WM8994_GPIO_11);
+ if (ret != 0)
+ dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
+
+ /* In case one of the GPIOs is used as a wake input. */
+ ret = regcache_sync_region(wm8994->regmap,
+ WM8994_INTERRUPT_STATUS_1_MASK,
+ WM8994_INTERRUPT_STATUS_1_MASK);
+ if (ret != 0)
+ dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
+
+ regcache_cache_only(wm8994->regmap, true);
+ 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;
+ }
+
+ regcache_cache_only(wm8994->regmap, false);
+ ret = regcache_sync(wm8994->regmap);
+ if (ret != 0) {
+ dev_err(dev, "Failed to restore register map: %d\n", ret);
+ goto err_enable;
+ }
+
+ /* 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;
+
+err_enable:
+ regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
+
+ return ret;
+}
+#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 const struct reg_default wm8994_revc_patch[] = {
+ { 0x102, 0x3 },
+ { 0x56, 0x3 },
+ { 0x817, 0x0 },
+ { 0x102, 0x0 },
+};
+
+static const struct reg_default wm8958_reva_patch[] = {
+ { 0x102, 0x3 },
+ { 0xcb, 0x81 },
+ { 0x817, 0x0 },
+ { 0x102, 0x0 },
+};
+
+static const struct reg_default wm1811_reva_patch[] = {
+ { 0x102, 0x3 },
+ { 0x56, 0xc07 },
+ { 0x5d, 0x7e },
+ { 0x5e, 0x0 },
+ { 0x102, 0x0 },
+};
+
+#ifdef CONFIG_OF
+static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
+{
+ struct device_node *np = wm8994->dev->of_node;
+ struct wm8994_pdata *pdata = &wm8994->pdata;
+ int i;
+
+ if (!np)
+ return 0;
+
+ if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
+ ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
+ for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
+ if (wm8994->pdata.gpio_defaults[i] == 0)
+ pdata->gpio_defaults[i]
+ = WM8994_CONFIGURE_GPIO;
+ }
+ }
+
+ of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
+ ARRAY_SIZE(pdata->micbias));
+
+ pdata->lineout1_diff = true;
+ pdata->lineout2_diff = true;
+ if (of_find_property(np, "wlf,lineout1-se", NULL))
+ pdata->lineout1_diff = false;
+ if (of_find_property(np, "wlf,lineout2-se", NULL))
+ pdata->lineout2_diff = false;
+
+ if (of_find_property(np, "wlf,lineout1-feedback", NULL))
+ pdata->lineout1fb = true;
+ if (of_find_property(np, "wlf,lineout2-feedback", NULL))
+ pdata->lineout2fb = true;
+
+ if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
+ pdata->lineout2fb = true;
+
+ pdata->ldo[0].enable = of_get_named_gpio(np, "wlf,ldo1ena", 0);
+ if (pdata->ldo[0].enable < 0)
+ pdata->ldo[0].enable = 0;
+
+ pdata->ldo[1].enable = of_get_named_gpio(np, "wlf,ldo2ena", 0);
+ if (pdata->ldo[1].enable < 0)
+ pdata->ldo[1].enable = 0;
+
+ return 0;
+}
+#else
+static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
+{
+ 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;
+ struct regmap_config *regmap_config;
+ const struct reg_default *regmap_patch = NULL;
+ const char *devname;
+ int ret, i, patch_regs = 0;
+ int pulls = 0;
+
+ if (dev_get_platdata(wm8994->dev)) {
+ pdata = dev_get_platdata(wm8994->dev);
+ wm8994->pdata = *pdata;
+ }
+ pdata = &wm8994->pdata;
+
+ ret = wm8994_set_pdata_from_of(wm8994);
+ if (ret != 0)
+ return ret;
+
+ dev_set_drvdata(wm8994->dev, wm8994);
+
+ /* Add the on-chip regulators first for bootstrapping */
+ ret = mfd_add_devices(wm8994->dev, 0,
+ wm8994_regulator_devs,
+ ARRAY_SIZE(wm8994_regulator_devs),
+ NULL, 0, NULL);
+ if (ret != 0) {
+ dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
+ goto err;
+ }
+
+ 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;
+ }
+
+ wm8994->supplies = devm_kzalloc(wm8994->dev,
+ sizeof(struct regulator_bulk_data) *
+ wm8994->num_supplies, GFP_KERNEL);
+ if (!wm8994->supplies) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ 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;
+ }
+
+ ret = devm_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;
+ }
+
+ 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;
+ }
+
+ 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;
+ }
+ wm8994->revision = ret & WM8994_CHIP_REV_MASK;
+ wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
+
+ switch (wm8994->type) {
+ case WM8994:
+ switch (wm8994->revision) {
+ case 0:
+ case 1:
+ dev_warn(wm8994->dev,
+ "revision %c not fully supported\n",
+ 'A' + wm8994->revision);
+ break;
+ case 2:
+ case 3:
+ default:
+ regmap_patch = wm8994_revc_patch;
+ patch_regs = ARRAY_SIZE(wm8994_revc_patch);
+ break;
+ }
+ break;
+
+ case WM8958:
+ switch (wm8994->revision) {
+ case 0:
+ regmap_patch = wm8958_reva_patch;
+ patch_regs = ARRAY_SIZE(wm8958_reva_patch);
+ break;
+ default:
+ break;
+ }
+ break;
+
+ case WM1811:
+ /* Revision C did not change the relevant layer */
+ if (wm8994->revision > 1)
+ wm8994->revision++;
+
+ regmap_patch = wm1811_reva_patch;
+ patch_regs = ARRAY_SIZE(wm1811_reva_patch);
+ break;
+
+ default:
+ break;
+ }
+
+ dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
+ 'A' + wm8994->revision, wm8994->cust_id);
+
+ switch (wm8994->type) {
+ case WM1811:
+ regmap_config = &wm1811_regmap_config;
+ break;
+ case WM8994:
+ regmap_config = &wm8994_regmap_config;
+ break;
+ case WM8958:
+ regmap_config = &wm8958_regmap_config;
+ break;
+ default:
+ dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
+ return -EINVAL;
+ }
+
+ ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
+ if (ret != 0) {
+ dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* Explicitly put the device into reset in case regulators
+ * don't get disabled in order to ensure we know the device
+ * state.
+ */
+ ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
+ wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
+ if (ret != 0) {
+ dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
+ return ret;
+ }
+
+ if (regmap_patch) {
+ ret = regmap_register_patch(wm8994->regmap, regmap_patch,
+ patch_regs);
+ if (ret != 0) {
+ dev_err(wm8994->dev, "Failed to register patch: %d\n",
+ ret);
+ goto err;
+ }
+ }
+
+ 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;
+
+ if (pdata->spkmode_pu)
+ pulls |= WM8994_SPKMODE_PU;
+
+ /* Disable unneeded pulls */
+ wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
+ WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
+ WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
+ pulls);
+
+ /* 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, NULL);
+ if (ret != 0) {
+ dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
+ goto err_irq;
+ }
+
+ pm_runtime_enable(wm8994->dev);
+ pm_runtime_idle(wm8994->dev);
+
+ return 0;
+
+err_irq:
+ wm8994_irq_exit(wm8994);
+err_enable:
+ regulator_bulk_disable(wm8994->num_supplies,
+ wm8994->supplies);
+err:
+ mfd_remove_devices(wm8994->dev);
+ 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);
+}
+
+static const struct of_device_id wm8994_of_match[] = {
+ { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
+ { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
+ { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
+ { }
+};
+MODULE_DEVICE_TABLE(of, wm8994_of_match);
+
+static int wm8994_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ const struct of_device_id *of_id;
+ struct wm8994 *wm8994;
+ int ret;
+
+ wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
+ if (wm8994 == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, wm8994);
+ wm8994->dev = &i2c->dev;
+ wm8994->irq = i2c->irq;
+
+ if (i2c->dev.of_node) {
+ of_id = of_match_device(wm8994_of_match, &i2c->dev);
+ if (of_id)
+ wm8994->type = (enum wm8994_type)of_id->data;
+ } else {
+ wm8994->type = id->driver_data;
+ }
+
+ wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
+ if (IS_ERR(wm8994->regmap)) {
+ ret = PTR_ERR(wm8994->regmap);
+ dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
+ ret);
+ 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 },
+ { "wm1811a", WM1811 },
+ { "wm8994", WM8994 },
+ { "wm8958", WM8958 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
+
+static const struct dev_pm_ops wm8994_pm_ops = {
+ SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
+};
+
+static struct i2c_driver wm8994_i2c_driver = {
+ .driver = {
+ .name = "wm8994",
+ .owner = THIS_MODULE,
+ .pm = &wm8994_pm_ops,
+ .of_match_table = of_match_ptr(wm8994_of_match),
+ },
+ .probe = wm8994_i2c_probe,
+ .remove = wm8994_i2c_remove,
+ .id_table = wm8994_i2c_id,
+};
+
+module_i2c_driver(wm8994_i2c_driver);
+
+MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");