ASoC: cs35l32: Add support for CS35L32 Boosted Amplifier

This patch adds support for the Cirrus Logic CS35L32 Boosted Amplifier
I2S output provides monitor data to the SOC/CODEC/DSP for speaker protection/enhancement algorithms

Signed-off-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 647 insertions, 0 deletions

diff --git a/sound/soc/codecs/cs35l32.c b/sound/soc/codecs/cs35l32.c
new file mode 100644
index 000000000000..90565d59def7
--- /dev/null
+++ b/sound/soc/codecs/cs35l32.c
@@ -0,0 +1,647 @@
+/*
+ * cs35l32.c -- CS35L32 ALSA SoC audio driver
+ *
+ * Copyright 2014 CirrusLogic, Inc.
+ *
+ * Author: Brian Austin <brian.austin@cirrus.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/gpio/consumer.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/initval.h>
+#include <sound/tlv.h>
+#include <dt-bindings/sound/cs35l32.h>
+
+#include "cs35l32.h"
+
+#define CS35L32_NUM_SUPPLIES 2
+static const char *const cs35l32_supply_names[CS35L32_NUM_SUPPLIES] = {
+        "VA",
+        "VP",
+};
+
+struct  cs35l32_private {
+        struct regmap *regmap;
+        struct snd_soc_codec *codec;
+        struct regulator_bulk_data supplies[CS35L32_NUM_SUPPLIES];
+        struct cs35l32_platform_data pdata;
+        struct gpio_desc *reset_gpio;
+};
+
+static const struct reg_default cs35l32_reg_defaults[] = {
+
+        { 0x06, 0x04 }, /* Power Ctl 1 */
+        { 0x07, 0xE8 }, /* Power Ctl 2 */
+        { 0x08, 0x40 }, /* Clock Ctl */
+        { 0x09, 0x20 }, /* Low Battery Threshold */
+        { 0x0A, 0x00 }, /* Voltage Monitor [RO] */
+        { 0x0B, 0x40 }, /* Conv Peak Curr Protection CTL */
+        { 0x0C, 0x07 }, /* IMON Scaling */
+        { 0x0D, 0x03 }, /* Audio/LED Pwr Manager */
+        { 0x0F, 0x20 }, /* Serial Port Control */
+        { 0x10, 0x14 }, /* Class D Amp CTL */
+        { 0x11, 0x00 }, /* Protection Release CTL */
+        { 0x12, 0xFF }, /* Interrupt Mask 1 */
+        { 0x13, 0xFF }, /* Interrupt Mask 2 */
+        { 0x14, 0xFF }, /* Interrupt Mask 3 */
+        { 0x19, 0x00 }, /* LED Flash Mode Current */
+        { 0x1A, 0x00 }, /* LED Movie Mode Current */
+        { 0x1B, 0x20 }, /* LED Flash Timer */
+        { 0x1C, 0x00 }, /* LED Flash Inhibit Current */
+};
+
+static bool cs35l32_readable_register(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case CS35L32_DEVID_AB:
+        case CS35L32_DEVID_CD:
+        case CS35L32_DEVID_E:
+        case CS35L32_FAB_ID:
+        case CS35L32_REV_ID:
+        case CS35L32_PWRCTL1:
+        case CS35L32_PWRCTL2:
+        case CS35L32_CLK_CTL:
+        case CS35L32_BATT_THRESHOLD:
+        case CS35L32_VMON:
+        case CS35L32_BST_CPCP_CTL:
+        case CS35L32_IMON_SCALING:
+        case CS35L32_AUDIO_LED_MNGR:
+        case CS35L32_ADSP_CTL:
+        case CS35L32_CLASSD_CTL:
+        case CS35L32_PROTECT_CTL:
+        case CS35L32_INT_MASK_1:
+        case CS35L32_INT_MASK_2:
+        case CS35L32_INT_MASK_3:
+        case CS35L32_INT_STATUS_1:
+        case CS35L32_INT_STATUS_2:
+        case CS35L32_INT_STATUS_3:
+        case CS35L32_LED_STATUS:
+        case CS35L32_FLASH_MODE:
+        case CS35L32_MOVIE_MODE:
+        case CS35L32_FLASH_TIMER:
+        case CS35L32_FLASH_INHIBIT:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static bool cs35l32_volatile_register(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case CS35L32_DEVID_AB:
+        case CS35L32_DEVID_CD:
+        case CS35L32_DEVID_E:
+        case CS35L32_FAB_ID:
+        case CS35L32_REV_ID:
+        case CS35L32_INT_STATUS_1:
+        case CS35L32_INT_STATUS_2:
+        case CS35L32_INT_STATUS_3:
+        case CS35L32_LED_STATUS:
+                return 1;
+        default:
+                return 0;
+        }
+}
+
+static bool cs35l32_precious_register(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case CS35L32_INT_STATUS_1:
+        case CS35L32_INT_STATUS_2:
+        case CS35L32_INT_STATUS_3:
+        case CS35L32_LED_STATUS:
+                return 1;
+        default:
+                return 0;
+        }
+}
+
+static DECLARE_TLV_DB_SCALE(classd_ctl_tlv, 900, 300, 0);
+
+static const struct snd_kcontrol_new imon_ctl =
+        SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 6, 1, 1);
+
+static const struct snd_kcontrol_new vmon_ctl =
+        SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 7, 1, 1);
+
+static const struct snd_kcontrol_new vpmon_ctl =
+        SOC_DAPM_SINGLE("Switch", CS35L32_PWRCTL2, 5, 1, 1);
+
+static const struct snd_kcontrol_new cs35l32_snd_controls[] = {
+        SOC_SINGLE_TLV("Speaker Volume", CS35L32_CLASSD_CTL,
+                       3, 0x04, 1, classd_ctl_tlv),
+        SOC_SINGLE("Zero Cross Switch", CS35L32_CLASSD_CTL, 2, 1, 0),
+        SOC_SINGLE("Gain Manager Switch", CS35L32_AUDIO_LED_MNGR, 3, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget cs35l32_dapm_widgets[] = {
+
+        SND_SOC_DAPM_SUPPLY("BOOST", CS35L32_PWRCTL1, 2, 1, NULL, 0),
+        SND_SOC_DAPM_OUT_DRV("Speaker", CS35L32_PWRCTL1, 7, 1, NULL, 0),
+
+        SND_SOC_DAPM_AIF_OUT("SDOUT", NULL, 0, CS35L32_PWRCTL2, 3, 1),
+
+        SND_SOC_DAPM_INPUT("VP"),
+        SND_SOC_DAPM_INPUT("ISENSE"),
+        SND_SOC_DAPM_INPUT("VSENSE"),
+
+        SND_SOC_DAPM_SWITCH("VMON ADC", CS35L32_PWRCTL2, 7, 1, &vmon_ctl),
+        SND_SOC_DAPM_SWITCH("IMON ADC", CS35L32_PWRCTL2, 6, 1, &imon_ctl),
+        SND_SOC_DAPM_SWITCH("VPMON ADC", CS35L32_PWRCTL2, 5, 1, &vpmon_ctl),
+};
+
+static const struct snd_soc_dapm_route cs35l32_audio_map[] = {
+
+        {"Speaker", NULL, "BOOST"},
+
+        {"VMON ADC", NULL, "VSENSE"},
+        {"IMON ADC", NULL, "ISENSE"},
+        {"VPMON ADC", NULL, "VP"},
+
+        {"SDOUT", "Switch", "VMON ADC"},
+        {"SDOUT",  "Switch", "IMON ADC"},
+        {"SDOUT", "Switch", "VPMON ADC"},
+
+        {"Capture", NULL, "SDOUT"},
+};
+
+static int cs35l32_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+
+        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+        case SND_SOC_DAIFMT_CBM_CFM:
+                snd_soc_update_bits(codec, CS35L32_ADSP_CTL,
+                                    CS35L32_ADSP_MASTER_MASK,
+                                CS35L32_ADSP_MASTER_MASK);
+                break;
+        case SND_SOC_DAIFMT_CBS_CFS:
+                snd_soc_update_bits(codec, CS35L32_ADSP_CTL,
+                                    CS35L32_ADSP_MASTER_MASK, 0);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int cs35l32_set_tristate(struct snd_soc_dai *dai, int tristate)
+{
+        struct snd_soc_codec *codec = dai->codec;
+
+        return snd_soc_update_bits(codec, CS35L32_PWRCTL2,
+                                        CS35L32_SDOUT_3ST, tristate << 3);
+}
+
+static const struct snd_soc_dai_ops cs35l32_ops = {
+        .set_fmt = cs35l32_set_dai_fmt,
+        .set_tristate = cs35l32_set_tristate,
+};
+
+static struct snd_soc_dai_driver cs35l32_dai[] = {
+        {
+                .name = "cs35l32-monitor",
+                .id = 0,
+                .capture = {
+                        .stream_name = "Capture",
+                        .channels_min = 2,
+                        .channels_max = 2,
+                        .rates = CS35L32_RATES,
+                        .formats = CS35L32_FORMATS,
+                },
+                .ops = &cs35l32_ops,
+                .symmetric_rates = 1,
+        }
+};
+
+static int cs35l32_codec_set_sysclk(struct snd_soc_codec *codec,
+                              int clk_id, int source, unsigned int freq, int dir)
+{
+
+        switch (freq) {
+        case 6000000:
+                snd_soc_update_bits(codec, CS35L32_CLK_CTL,
+                                    CS35L32_MCLK_DIV2_MASK, 0);
+                snd_soc_update_bits(codec, CS35L32_CLK_CTL,
+                                    CS35L32_MCLK_RATIO_MASK,
+                                        CS35L32_MCLK_RATIO);
+                break;
+        case 12000000:
+                snd_soc_update_bits(codec, CS35L32_CLK_CTL,
+                                    CS35L32_MCLK_DIV2_MASK,
+                                        CS35L32_MCLK_DIV2_MASK);
+                snd_soc_update_bits(codec, CS35L32_CLK_CTL,
+                                    CS35L32_MCLK_RATIO_MASK,
+                                        CS35L32_MCLK_RATIO);
+                break;
+        case 6144000:
+                snd_soc_update_bits(codec, CS35L32_CLK_CTL,
+                                    CS35L32_MCLK_DIV2_MASK, 0);
+                snd_soc_update_bits(codec, CS35L32_CLK_CTL,
+                                    CS35L32_MCLK_RATIO_MASK, 0);
+                break;
+        case 12288000:
+                snd_soc_update_bits(codec, CS35L32_CLK_CTL,
+                                    CS35L32_MCLK_DIV2_MASK,
+                                        CS35L32_MCLK_DIV2_MASK);
+                snd_soc_update_bits(codec, CS35L32_CLK_CTL,
+                                    CS35L32_MCLK_RATIO_MASK, 0);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static struct snd_soc_codec_driver soc_codec_dev_cs35l32 = {
+        .set_sysclk = cs35l32_codec_set_sysclk,
+
+        .dapm_widgets = cs35l32_dapm_widgets,
+        .num_dapm_widgets = ARRAY_SIZE(cs35l32_dapm_widgets),
+        .dapm_routes = cs35l32_audio_map,
+        .num_dapm_routes = ARRAY_SIZE(cs35l32_audio_map),
+
+        .controls = cs35l32_snd_controls,
+        .num_controls = ARRAY_SIZE(cs35l32_snd_controls),
+};
+
+/* Current and threshold powerup sequence Pg37 in datasheet */
+static const struct reg_default cs35l32_monitor_patch[] = {
+
+        { 0x00, 0x99 },
+        { 0x48, 0x17 },
+        { 0x49, 0x56 },
+        { 0x43, 0x01 },
+        { 0x3B, 0x62 },
+        { 0x3C, 0x80 },
+        { 0x00, 0x00 },
+};
+
+static struct regmap_config cs35l32_regmap = {
+        .reg_bits = 8,
+        .val_bits = 8,
+
+        .max_register = CS35L32_MAX_REGISTER,
+        .reg_defaults = cs35l32_reg_defaults,
+        .num_reg_defaults = ARRAY_SIZE(cs35l32_reg_defaults),
+        .volatile_reg = cs35l32_volatile_register,
+        .readable_reg = cs35l32_readable_register,
+        .precious_reg = cs35l32_precious_register,
+        .cache_type = REGCACHE_RBTREE,
+};
+
+static int cs35l32_handle_of_data(struct i2c_client *i2c_client,
+                                    struct cs35l32_platform_data *pdata)
+{
+        struct device_node *np = i2c_client->dev.of_node;
+        unsigned int val;
+
+        if (of_property_read_u32(np, "cirrus,sdout-share", &val) >= 0)
+                pdata->sdout_share = val;
+
+        of_property_read_u32(np, "cirrus,boost-manager", &val);
+        switch (val) {
+        case CS35L32_BOOST_MGR_AUTO:
+        case CS35L32_BOOST_MGR_AUTO_AUDIO:
+        case CS35L32_BOOST_MGR_BYPASS:
+        case CS35L32_BOOST_MGR_FIXED:
+                pdata->boost_mng = val;
+                break;
+        default:
+                dev_err(&i2c_client->dev,
+                        "Wrong cirrus,boost-manager DT value %d\n", val);
+                pdata->boost_mng = CS35L32_BOOST_MGR_BYPASS;
+        }
+
+        of_property_read_u32(np, "cirrus,sdout-datacfg", &val);
+        switch (val) {
+        case CS35L32_DATA_CFG_LR_VP:
+        case CS35L32_DATA_CFG_LR_STAT:
+        case CS35L32_DATA_CFG_LR:
+        case CS35L32_DATA_CFG_LR_VPSTAT:
+                pdata->sdout_datacfg = val;
+                break;
+        default:
+                dev_err(&i2c_client->dev,
+                        "Wrong cirrus,sdout-datacfg DT value %d\n", val);
+                pdata->sdout_datacfg = CS35L32_DATA_CFG_LR;
+        }
+
+        of_property_read_u32(np, "cirrus,battery-threshold", &val);
+        switch (val) {
+        case CS35L32_BATT_THRESH_3_1V:
+        case CS35L32_BATT_THRESH_3_2V:
+        case CS35L32_BATT_THRESH_3_3V:
+        case CS35L32_BATT_THRESH_3_4V:
+                pdata->batt_thresh = val;
+                break;
+        default:
+                dev_err(&i2c_client->dev,
+                        "Wrong cirrus,battery-threshold DT value %d\n", val);
+                pdata->batt_thresh = CS35L32_BATT_THRESH_3_3V;
+        }
+
+        of_property_read_u32(np, "cirrus,battery-recovery", &val);
+        switch (val) {
+        case CS35L32_BATT_RECOV_3_1V:
+        case CS35L32_BATT_RECOV_3_2V:
+        case CS35L32_BATT_RECOV_3_3V:
+        case CS35L32_BATT_RECOV_3_4V:
+        case CS35L32_BATT_RECOV_3_5V:
+        case CS35L32_BATT_RECOV_3_6V:
+                pdata->batt_recov = val;
+                break;
+        default:
+                dev_err(&i2c_client->dev,
+                        "Wrong cirrus,battery-recovery DT value %d\n", val);
+                pdata->batt_recov = CS35L32_BATT_RECOV_3_4V;
+        }
+
+        return 0;
+}
+
+static int cs35l32_i2c_probe(struct i2c_client *i2c_client,
+                                       const struct i2c_device_id *id)
+{
+        struct cs35l32_private *cs35l32;
+        struct cs35l32_platform_data *pdata =
+                dev_get_platdata(&i2c_client->dev);
+        int ret, i;
+        unsigned int devid = 0;
+        unsigned int reg;
+
+
+        cs35l32 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs35l32_private),
+                               GFP_KERNEL);
+        if (!cs35l32) {
+                dev_err(&i2c_client->dev, "could not allocate codec\n");
+                return -ENOMEM;
+        }
+
+        i2c_set_clientdata(i2c_client, cs35l32);
+
+        cs35l32->regmap = devm_regmap_init_i2c(i2c_client, &cs35l32_regmap);
+        if (IS_ERR(cs35l32->regmap)) {
+                ret = PTR_ERR(cs35l32->regmap);
+                dev_err(&i2c_client->dev, "regmap_init() failed: %d\n", ret);
+                return ret;
+        }
+
+        if (pdata) {
+                cs35l32->pdata = *pdata;
+        } else {
+                pdata = devm_kzalloc(&i2c_client->dev,
+                                     sizeof(struct cs35l32_platform_data),
+                                GFP_KERNEL);
+                if (!pdata) {
+                        dev_err(&i2c_client->dev, "could not allocate pdata\n");
+                        return -ENOMEM;
+                }
+                if (i2c_client->dev.of_node) {
+                        ret = cs35l32_handle_of_data(i2c_client,
+                                                     &cs35l32->pdata);
+                        if (ret != 0)
+                                return ret;
+                }
+        }
+
+        for (i = 0; i < ARRAY_SIZE(cs35l32->supplies); i++)
+                cs35l32->supplies[i].supply = cs35l32_supply_names[i];
+
+        ret = devm_regulator_bulk_get(&i2c_client->dev,
+                                      ARRAY_SIZE(cs35l32->supplies),
+                                      cs35l32->supplies);
+        if (ret != 0) {
+                dev_err(&i2c_client->dev,
+                        "Failed to request supplies: %d\n", ret);
+                return ret;
+        }
+
+        ret = regulator_bulk_enable(ARRAY_SIZE(cs35l32->supplies),
+                                    cs35l32->supplies);
+        if (ret != 0) {
+                dev_err(&i2c_client->dev,
+                        "Failed to enable supplies: %d\n", ret);
+                return ret;
+        }
+
+        /* Reset the Device */
+        cs35l32->reset_gpio = devm_gpiod_get(&i2c_client->dev,
+                "reset-gpios");
+        if (IS_ERR(cs35l32->reset_gpio)) {
+                ret = PTR_ERR(cs35l32->reset_gpio);
+                if (ret != -ENOENT && ret != -ENOSYS)
+                        return ret;
+
+                cs35l32->reset_gpio = NULL;
+        } else {
+                ret = gpiod_direction_output(cs35l32->reset_gpio, 0);
+                if (ret)
+                        return ret;
+                gpiod_set_value_cansleep(cs35l32->reset_gpio, 1);
+        }
+
+        /* initialize codec */
+        ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_AB, &reg);
+        devid = (reg & 0xFF) << 12;
+
+        ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_CD, &reg);
+        devid |= (reg & 0xFF) << 4;
+
+        ret = regmap_read(cs35l32->regmap, CS35L32_DEVID_E, &reg);
+        devid |= (reg & 0xF0) >> 4;
+
+        if (devid != CS35L32_CHIP_ID) {
+                ret = -ENODEV;
+                dev_err(&i2c_client->dev,
+                        "CS35L32 Device ID (%X). Expected %X\n",
+                        devid, CS35L32_CHIP_ID);
+                return ret;
+        }
+
+        ret = regmap_read(cs35l32->regmap, CS35L32_REV_ID, &reg);
+        if (ret < 0) {
+                dev_err(&i2c_client->dev, "Get Revision ID failed\n");
+                return ret;
+        }
+
+        ret = regmap_register_patch(cs35l32->regmap, cs35l32_monitor_patch,
+                                    ARRAY_SIZE(cs35l32_monitor_patch));
+        if (ret < 0) {
+                dev_err(&i2c_client->dev, "Failed to apply errata patch\n");
+                return ret;
+        }
+
+        dev_info(&i2c_client->dev,
+                 "Cirrus Logic CS35L32, Revision: %02X\n", reg & 0xFF);
+
+        /* Setup VBOOST Management */
+        if (cs35l32->pdata.boost_mng)
+                regmap_update_bits(cs35l32->regmap, CS35L32_AUDIO_LED_MNGR,
+                                   CS35L32_BOOST_MASK,
+                                cs35l32->pdata.boost_mng);
+
+        /* Setup ADSP Format Config */
+        if (cs35l32->pdata.sdout_share)
+                regmap_update_bits(cs35l32->regmap, CS35L32_ADSP_CTL,
+                                    CS35L32_ADSP_SHARE_MASK,
+                                cs35l32->pdata.sdout_share << 3);
+
+        /* Setup ADSP Data Configuration */
+        if (cs35l32->pdata.sdout_datacfg)
+                regmap_update_bits(cs35l32->regmap, CS35L32_ADSP_CTL,
+                                   CS35L32_ADSP_DATACFG_MASK,
+                                cs35l32->pdata.sdout_datacfg << 4);
+
+        /* Setup Low Battery Recovery  */
+        if (cs35l32->pdata.batt_recov)
+                regmap_update_bits(cs35l32->regmap, CS35L32_BATT_THRESHOLD,
+                                   CS35L32_BATT_REC_MASK,
+                                cs35l32->pdata.batt_recov << 1);
+
+        /* Setup Low Battery Threshold */
+        if (cs35l32->pdata.batt_thresh)
+                regmap_update_bits(cs35l32->regmap, CS35L32_BATT_THRESHOLD,
+                                   CS35L32_BATT_THRESH_MASK,
+                                cs35l32->pdata.batt_thresh << 4);
+
+        /* Power down the AMP */
+        regmap_update_bits(cs35l32->regmap, CS35L32_PWRCTL1, CS35L32_PDN_AMP,
+                            CS35L32_PDN_AMP);
+
+        /* Clear MCLK Error Bit since we don't have the clock yet */
+        ret = regmap_read(cs35l32->regmap, CS35L32_INT_STATUS_1, &reg);
+
+        ret =  snd_soc_register_codec(&i2c_client->dev,
+                        &soc_codec_dev_cs35l32, cs35l32_dai,
+                        ARRAY_SIZE(cs35l32_dai));
+        if (ret < 0)
+                goto err_disable;
+
+        return 0;
+
+err_disable:
+        regulator_bulk_disable(ARRAY_SIZE(cs35l32->supplies),
+                               cs35l32->supplies);
+}
+
+static int cs35l32_i2c_remove(struct i2c_client *i2c_client)
+{
+        struct cs35l32_private *cs35l32 = i2c_get_clientdata(i2c_client);
+
+        snd_soc_unregister_codec(&i2c_client->dev);
+
+        /* Hold down reset */
+        if (cs35l32->reset_gpio)
+                gpiod_set_value_cansleep(cs35l32->reset_gpio, 0);
+
+        regulator_bulk_free(ARRAY_SIZE(cs35l32->supplies), cs35l32->supplies);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM_RUNTIME
+static int cs35l32_runtime_suspend(struct device *dev)
+{
+        struct cs35l32_private *cs35l32 = dev_get_drvdata(dev);
+
+        regcache_cache_only(cs35l32->regmap, true);
+        regcache_mark_dirty(cs35l32->regmap);
+
+        /* Hold down reset */
+        if (cs35l32->reset_gpio)
+                gpiod_set_value_cansleep(cs35l32->reset_gpio, 0);
+
+        /* remove power */
+        regulator_bulk_disable(ARRAY_SIZE(cs35l32->supplies),
+                               cs35l32->supplies);
+
+        return 0;
+}
+
+static int cs35l32_runtime_resume(struct device *dev)
+{
+        struct cs35l32_private *cs35l32 = dev_get_drvdata(dev);
+        int ret;
+
+        /* Enable power */
+        ret = regulator_bulk_enable(ARRAY_SIZE(cs35l32->supplies),
+                                    cs35l32->supplies);
+        if (ret != 0) {
+                dev_err(dev, "Failed to enable supplies: %d\n",
+                        ret);
+                return ret;
+        }
+
+        if (cs35l32->reset_gpio)
+                gpiod_set_value_cansleep(cs35l32->reset_gpio, 1);
+
+        regcache_cache_only(cs35l32->regmap, false);
+        regcache_sync(cs35l32->regmap);
+
+        return 0;
+}
+#endif
+
+static const struct dev_pm_ops cs35l32_runtime_pm = {
+        SET_RUNTIME_PM_OPS(cs35l32_runtime_suspend, cs35l32_runtime_resume,
+                           NULL)
+};
+
+static const struct of_device_id cs35l32_of_match[] = {
+        { .compatible = "cirrus,cs35l32", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, cs35l32_of_match);
+
+
+static const struct i2c_device_id cs35l32_id[] = {
+        {"cs35l32", 0},
+        {}
+};
+
+MODULE_DEVICE_TABLE(i2c, cs35l32_id);
+
+static struct i2c_driver cs35l32_i2c_driver = {
+        .driver = {
+                   .name = "cs35l32",
+                   .owner = THIS_MODULE,
+                   .pm = &cs35l32_runtime_pm,
+                   .of_match_table = cs35l32_of_match,
+                   },
+        .id_table = cs35l32_id,
+        .probe = cs35l32_i2c_probe,
+        .remove = cs35l32_i2c_remove,
+};
+
+module_i2c_driver(cs35l32_i2c_driver);
+
+MODULE_DESCRIPTION("ASoC CS35L32 driver");
+MODULE_AUTHOR("Brian Austin, Cirrus Logic Inc, <brian.austin@cirrus.com>");
+MODULE_LICENSE("GPL");