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path: root/drivers/mfd/tlv320aic3262-core.c
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Diffstat (limited to 'drivers/mfd/tlv320aic3262-core.c')
-rw-r--r--drivers/mfd/tlv320aic3262-core.c885
1 files changed, 885 insertions, 0 deletions
diff --git a/drivers/mfd/tlv320aic3262-core.c b/drivers/mfd/tlv320aic3262-core.c
new file mode 100644
index 000000000000..7b61c7497a45
--- /dev/null
+++ b/drivers/mfd/tlv320aic3262-core.c
@@ -0,0 +1,885 @@
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/spi/spi.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/gpio.h>
+
+#include <linux/mfd/tlv320aic3262-core.h>
+#include <linux/mfd/tlv320aic3262-registers.h>
+#define DEBUG
+struct aic3262_gpio {
+ unsigned int reg;
+ u8 mask;
+ u8 shift;
+};
+struct aic3262_gpio aic3262_gpio_control[] = {
+ {
+ .reg = AIC3262_GPIO1_IO_CNTL,
+ .mask = AIC3262_GPIO_D6_D2,
+ .shift = AIC3262_GPIO_D2_SHIFT,
+ },
+ {
+ .reg = AIC3262_GPIO2_IO_CNTL,
+ .mask = AIC3262_GPIO_D6_D2,
+ .shift = AIC3262_GPIO_D2_SHIFT,
+ },
+ {
+ .reg = AIC3262_GPI1_EN,
+ .mask = AIC3262_GPI1_D2_D1,
+ .shift = AIC3262_GPIO_D1_SHIFT,
+ },
+ {
+ .reg = AIC3262_GPI2_EN,
+ .mask = AIC3262_GPI2_D5_D4,
+ .shift = AIC3262_GPIO_D4_SHIFT,
+ },
+ {
+ .reg = AIC3262_GPO1_OUT_CNTL,
+ .mask = AIC3262_GPO1_D4_D1,
+ .shift = AIC3262_GPIO_D1_SHIFT,
+ },
+};
+static int aic3262_read(struct aic3262 *aic3262, unsigned int reg,
+ int bytes, void *dest)
+{
+ int ret;
+ int i;
+ u8 *buf = dest;
+
+ BUG_ON(bytes <= 0);
+
+ ret = aic3262->read_dev(aic3262, reg, bytes, dest);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < bytes ; i++) {
+ dev_vdbg(aic3262->dev, "Read %04x from R%d(0x%x)\n",
+ buf[i], reg + i, reg + i);
+ }
+
+ return ret;
+}
+
+/**
+ * aic3262_reg_read: Read a single TLV320AIC3262 register.
+ *
+ * @aic3262: Device to read from.
+ * @reg: Register to read.
+ */
+int aic3262_reg_read(struct aic3262 *aic3262, unsigned int reg)
+{
+ unsigned char val;
+ int ret;
+
+ mutex_lock(&aic3262->io_lock);
+
+ ret = aic3262_read(aic3262, reg, 1, &val);
+
+ mutex_unlock(&aic3262->io_lock);
+
+ if (ret < 0)
+ return ret;
+ else
+ return val;
+}
+EXPORT_SYMBOL_GPL(aic3262_reg_read);
+
+/**
+ * aic3262_bulk_read: Read multiple TLV320AIC3262 registers
+ *
+ * @aic3262: Device to read from
+ * @reg: First register
+ * @count: Number of registers
+ * @buf: Buffer to fill. The data will be returned big endian.
+ */
+int aic3262_bulk_read(struct aic3262 *aic3262, unsigned int reg,
+ int count, u8 *buf)
+{
+ int ret;
+
+ mutex_lock(&aic3262->io_lock);
+
+ ret = aic3262_read(aic3262, reg, count, buf);
+
+ mutex_unlock(&aic3262->io_lock);
+
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(aic3262_bulk_read);
+
+static int aic3262_write(struct aic3262 *aic3262, unsigned int reg,
+ int bytes, const void *src)
+{
+ const u8 *buf = src;
+ int i;
+
+ BUG_ON(bytes <= 0);
+
+ for (i = 0; i < bytes ; i++) {
+ dev_vdbg(aic3262->dev, "Write %04x to R%d(0x%x)\n",
+ buf[i], reg + i, reg + i);
+ }
+
+ return aic3262->write_dev(aic3262, reg, bytes, src);
+}
+
+/**
+ * aic3262_reg_write: Write a single TLV320AIC3262 register.
+ *
+ * @aic3262: Device to write to.
+ * @reg: Register to write to.
+ * @val: Value to write.
+ */
+int aic3262_reg_write(struct aic3262 *aic3262, unsigned int reg,
+ unsigned char val)
+{
+ int ret;
+
+
+ mutex_lock(&aic3262->io_lock);
+
+ dev_dbg(aic3262->dev, "w 30 %x %x", reg, val);
+ ret = aic3262_write(aic3262, reg, 1, &val);
+
+ mutex_unlock(&aic3262->io_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(aic3262_reg_write);
+
+/**
+ * aic3262_bulk_write: Write multiple TLV320AIC3262 registers
+ *
+ * @aic3262: Device to write to
+ * @reg: First register
+ * @count: Number of registers
+ * @buf: Buffer to write from. Data must be big-endian formatted.
+ */
+int aic3262_bulk_write(struct aic3262 *aic3262, unsigned int reg,
+ int count, const u8 *buf)
+{
+ int ret;
+
+ mutex_lock(&aic3262->io_lock);
+
+ ret = aic3262_write(aic3262, reg, count, buf);
+
+ mutex_unlock(&aic3262->io_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(aic3262_bulk_write);
+
+/**
+ * aic3262_set_bits: Set the value of a bitfield in a TLV320AIC3262 register
+ *
+ * @aic3262: Device to write to.
+ * @reg: Register to write to.
+ * @mask: Mask of bits to set.
+ * @val: Value to set (unshifted)
+ */
+int aic3262_set_bits(struct aic3262 *aic3262, unsigned int reg,
+ unsigned char mask, unsigned char val)
+{
+ int ret;
+ u8 r;
+
+ mutex_lock(&aic3262->io_lock);
+
+ ret = aic3262_read(aic3262, reg, 1, &r);
+ if (ret < 0)
+ goto out;
+
+
+ r &= ~mask;
+ r |= (val & mask);
+
+ dev_dbg(aic3262->dev, "w 30 %x %x", reg, r);
+ ret = aic3262_write(aic3262, reg, 1, &r);
+
+out:
+ mutex_unlock(&aic3262->io_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(aic3262_set_bits);
+
+/**
+ * aic3262_wait_bits: wait for a value of a bitfield in a TLV320AIC3262 register
+ *
+ * @aic3262: Device to write to.
+ * @reg: Register to write to.
+ * @mask: Mask of bits to set.
+ * @val: Value to set (unshifted)
+ * @sleep: mdelay value in each iteration in milliseconds
+ * @count: iteration count for timeout
+ */
+int aic3262_wait_bits(struct aic3262 *aic3262, unsigned int reg,
+ unsigned char mask, unsigned char val, int sleep, int counter)
+{
+ int status;
+ int timeout = sleep*counter;
+
+ status = aic3262_reg_read(aic3262, reg);
+ while (((status & mask) != val) && counter) {
+ mdelay(sleep);
+ status = aic3262_reg_read(aic3262, reg);
+ counter--;
+ };
+ if (!counter)
+ dev_err(aic3262->dev,
+ "wait_bits timedout (%d millisecs). lastval 0x%x\n",
+ timeout, status);
+ return counter;
+}
+EXPORT_SYMBOL_GPL(aic3262_wait_bits);
+
+/* to be changed -- Mukund*/
+static struct resource aic3262_codec_resources[] = {
+ {
+ .start = AIC3262_IRQ_HEADSET_DETECT,
+ .end = AIC3262_IRQ_SPEAKER_OVER_TEMP,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct resource aic3262_gpio_resources[] = {
+ {
+ .start = AIC3262_GPIO1,
+ .end = AIC3262_GPO1,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct mfd_cell aic3262_devs[] = {
+ {
+ .name = "tlv320aic3262-codec",
+ .num_resources = ARRAY_SIZE(aic3262_codec_resources),
+ .resources = aic3262_codec_resources,
+ },
+
+ {
+ .name = "tlv320aic3262-gpio",
+ .num_resources = ARRAY_SIZE(aic3262_gpio_resources),
+ .resources = aic3262_gpio_resources,
+ .pm_runtime_no_callbacks = true,
+ },
+};
+
+
+#ifdef CONFIG_PM
+static int aic3262_suspend(struct device *dev)
+{
+ struct aic3262 *aic3262 = dev_get_drvdata(dev);
+
+ aic3262->suspended = true;
+
+ return 0;
+}
+
+static int aic3262_resume(struct device *dev)
+{
+ struct aic3262 *aic3262 = dev_get_drvdata(dev);
+
+
+ aic3262->suspended = false;
+
+ return 0;
+}
+
+static UNIVERSAL_DEV_PM_OPS(aic3262_pm_ops, aic3262_suspend, aic3262_resume,
+ NULL);
+#endif
+
+
+/*
+ * Instantiate the generic non-control parts of the device.
+ */
+static int aic3262_device_init(struct aic3262 *aic3262, int irq)
+{
+ struct aic3262_pdata *pdata = aic3262->dev->platform_data;
+ const char *devname;
+ int ret, i;
+ u8 revID, pgID;
+ unsigned int naudint = 0;
+ u8 resetVal = 1;
+
+ mutex_init(&aic3262->io_lock);
+ dev_set_drvdata(aic3262->dev, aic3262);
+ if (pdata) {
+ if (pdata->gpio_reset) {
+ ret = gpio_request(pdata->gpio_reset,
+ "aic3262-reset-pin");
+ if (ret != 0) {
+ dev_err(aic3262->dev,
+ "Failed to reset aic3262 using gpio %d\n",
+ pdata->gpio_reset);
+ goto err_return;
+ }
+ gpio_direction_output(pdata->gpio_reset, 1);
+ mdelay(5);
+ gpio_direction_output(pdata->gpio_reset, 0);
+ mdelay(5);
+ gpio_direction_output(pdata->gpio_reset, 1);
+ mdelay(5);
+ }
+ }
+
+
+ /* run the codec through software reset */
+ ret = aic3262_reg_write(aic3262, AIC3262_RESET_REG, resetVal);
+ if (ret < 0) {
+ dev_err(aic3262->dev, "Could not write to AIC3262 register\n");
+ goto err_return;
+ }
+
+ mdelay(10);
+
+ ret = aic3262_reg_read(aic3262, AIC3262_REV_PG_ID);
+ if (ret < 0) {
+ dev_err(aic3262->dev, "Failed to read ID register\n");
+ goto err_return;
+ }
+ revID = (ret & AIC3262_REV_MASK) >> AIC3262_REV_SHIFT;
+ pgID = (ret & AIC3262_PG_MASK) >> AIC3262_PG_SHIFT;
+ switch (revID) {
+ case 3:
+ devname = "TLV320AIC3262";
+ if (aic3262->type != TLV320AIC3262)
+ dev_warn(aic3262->dev, "Device registered as type %d\n",
+ aic3262->type);
+ aic3262->type = TLV320AIC3262;
+ break;
+ case 1:
+ devname = "TLV320AIC3262";
+ if (aic3262->type != TLV320AIC3262)
+ dev_warn(aic3262->dev, "Device registered as type %d\n",
+ aic3262->type);
+ aic3262->type = TLV320AIC3262;
+ break;
+
+ default:
+ dev_err(aic3262->dev, "Device is not a TLV320AIC3262, ID is %x\n",
+ ret);
+ ret = -EINVAL;
+ goto err_return;
+
+ }
+
+ dev_info(aic3262->dev, "%s revision %c\n", devname, 'D' + ret);
+
+
+ if (pdata) {
+ if (pdata->gpio_irq == 1) {
+ naudint = gpio_to_irq(pdata->naudint_irq);
+ gpio_request(pdata->naudint_irq, "aic3262-gpio-irq");
+ gpio_direction_input(pdata->naudint_irq);
+ } else
+ naudint = pdata->naudint_irq;
+
+ aic3262->irq = naudint;
+ aic3262->irq_base = pdata->irq_base;
+ for (i = 0; i < AIC3262_NUM_GPIO; i++) {
+ if (pdata->gpio[i].used) {
+ /* Direction is input */
+ if (pdata->gpio[i].in) {
+ /* set direction to input for GPIO,
+ and enable for GPI */
+ aic3262_set_bits(aic3262,
+ aic3262_gpio_control[i].reg,
+ aic3262_gpio_control[i].mask,
+ 0x1 <<
+ aic3262_gpio_control[i].shift);
+
+ if (pdata->gpio[i].in_reg)
+ /* Some input modes, does not
+ need extra registers to be
+ written */
+ aic3262_set_bits(aic3262,
+ pdata->gpio[i].in_reg,
+ pdata->gpio[i].
+ in_reg_bitmask,
+ pdata->gpio[i].value <<
+ pdata->gpio[i].
+ in_reg_shift);
+ } else {
+ /* Direction si output */
+ aic3262_set_bits(aic3262,
+ aic3262_gpio_control[i].reg,
+ aic3262_gpio_control[i].mask,
+ pdata->gpio[i].value <<
+ aic3262_gpio_control[i].shift);
+ }
+ } else
+ aic3262_set_bits(aic3262,
+ aic3262_gpio_control[i].reg,
+ aic3262_gpio_control[i].mask, 0x0);
+ }
+ }
+
+ if (naudint) {
+ /* codec interrupt */
+ ret = aic3262_irq_init(aic3262);
+ if (ret)
+ goto err_irq;
+ }
+
+ ret = mfd_add_devices(aic3262->dev, -1,
+ aic3262_devs, ARRAY_SIZE(aic3262_devs),
+ NULL, 0);
+ if (ret != 0) {
+ dev_err(aic3262->dev, "Failed to add children: %d\n", ret);
+ goto err_irq;
+ }
+
+ pm_runtime_enable(aic3262->dev);
+ pm_runtime_resume(aic3262->dev);
+
+ return 0;
+
+err_irq:
+ aic3262_irq_exit(aic3262);
+err_return:
+ kfree(aic3262);
+ return ret;
+}
+
+static void aic3262_device_exit(struct aic3262 *aic3262)
+{
+ pm_runtime_disable(aic3262->dev);
+ mfd_remove_devices(aic3262->dev);
+ aic3262_irq_exit(aic3262);
+ kfree(aic3262);
+}
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+
+
+static int aic3262_i2c_read_device(struct aic3262 *aic3262, unsigned int reg,
+ int bytes, void *dest)
+{
+ struct i2c_client *i2c = aic3262->control_data;
+ union aic326x_reg_union *aic_reg = (union aic326x_reg_union *) &reg;
+ char *value;
+ int ret;
+ u8 buf[2];
+ u8 page, book, offset;
+ page = aic_reg->aic326x_register.page;
+ book = aic_reg->aic326x_register.book;
+ offset = aic_reg->aic326x_register.offset;
+ if (aic3262->book_no != book) {
+ /* We should change to page 0.
+ Change the book by writing to offset 127 of page 0
+ Change the page back to whatever was set before change page */
+ buf[0] = 0x0;
+ buf[1] = 0x0;
+ ret = i2c_master_send(i2c, (unsigned char *)buf, 2);
+ if (ret < 0)
+ return ret;
+ if (ret != 2)
+ return -EIO;
+ buf[0] = 127;
+ buf[1] = book;
+ ret = i2c_master_send(i2c, (unsigned char *)buf, 2);
+ if (ret < 0)
+ return ret;
+ if (ret != 2)
+ return -EIO;
+ aic3262->book_no = book;
+ aic3262->page_no = 0x0;
+ }
+
+ if (aic3262->page_no != page) {
+ buf[0] = 0x0;
+ buf[1] = page;
+ ret = i2c_master_send(i2c, (unsigned char *) buf, 2);
+
+ if (ret < 0)
+ return ret;
+ if (ret != 2)
+ return -EIO;
+ aic3262->page_no = page;
+ }
+
+ /* Send the required offset */
+ buf[0] = offset ;
+ ret = i2c_master_send(i2c, (unsigned char *)buf, 1);
+ if (ret < 0)
+ return ret;
+ if (ret != 1)
+ return -EIO;
+
+ ret = i2c_master_recv(i2c, dest, bytes);
+ value = dest;
+ if (ret < 0)
+ return ret;
+ if (ret != bytes)
+ return -EIO;
+ return ret;
+}
+
+static int aic3262_i2c_write_device(struct aic3262 *aic3262, unsigned int reg,
+ int bytes, const void *src)
+{
+ struct i2c_client *i2c = aic3262->control_data;
+ int ret;
+
+ union aic326x_reg_union *aic_reg = (union aic326x_reg_union *) &reg;
+
+ u8 buf[2];
+ u8 write_buf[bytes + 1];
+ u8 page, book, offset;
+ page = aic_reg->aic326x_register.page;
+ book = aic_reg->aic326x_register.book;
+ offset = aic_reg->aic326x_register.offset;
+ if (aic3262->book_no != book) {
+ /* We should change to page 0.
+ Change the book by writing to offset 127 of page 0
+ Change the page back to whatever was set before change page*/
+ buf[0] = 0x0;
+ buf[1] = 0x0;
+ ret = i2c_master_send(i2c, (unsigned char *)buf, 2);
+
+ if (ret < 0)
+ return ret;
+ if (ret != 2)
+ return -EIO;
+ buf[0] = 127;
+ buf[1] = book;
+ ret = i2c_master_send(i2c, (unsigned char *)buf, 2);
+ if (ret < 0)
+ return ret;
+ if (ret != 2)
+ return -EIO;
+ aic3262->book_no = book;
+ aic3262->page_no = 0x0;
+ }
+
+ if (aic3262->page_no != page) {
+ buf[0] = 0x0;
+ buf[1] = page;
+ ret = i2c_master_send(i2c, (unsigned char *) buf, 2);
+ if (ret < 0)
+ return ret;
+ if (ret != 2)
+ return -EIO;
+ aic3262->page_no = page;
+ }
+ write_buf[0] = offset;
+ memcpy(&write_buf[1], src, bytes);
+ ret = i2c_master_send(i2c, write_buf, bytes + 1);
+ if (ret < 0)
+ return ret;
+ if (ret != (bytes + 1))
+ return -EIO;
+
+ return 0;
+}
+
+static int aic3262_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct aic3262 *aic3262;
+
+ aic3262 = kzalloc(sizeof(struct aic3262), GFP_KERNEL);
+ if (aic3262 == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, aic3262);
+ aic3262->dev = &i2c->dev;
+ aic3262->control_data = i2c;
+ aic3262->read_dev = aic3262_i2c_read_device;
+ aic3262->write_dev = aic3262_i2c_write_device;
+ aic3262->type = id->driver_data;
+ aic3262->book_no = 255;
+ aic3262->page_no = 255;
+
+ return aic3262_device_init(aic3262, i2c->irq);
+}
+
+static int aic3262_i2c_remove(struct i2c_client *i2c)
+{
+ struct aic3262 *aic3262 = i2c_get_clientdata(i2c);
+
+ aic3262_device_exit(aic3262);
+
+ return 0;
+}
+
+static const struct i2c_device_id aic3262_i2c_id[] = {
+ { "tlv320aic3262", TLV320AIC3262 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, aic3262_i2c_id);
+
+
+static struct i2c_driver aic3262_i2c_driver = {
+ .driver = {
+ .name = "tlv320aic3262",
+ .owner = THIS_MODULE,
+ .pm = &aic3262_pm_ops,
+ },
+ .probe = aic3262_i2c_probe,
+ .remove = aic3262_i2c_remove,
+ .id_table = aic3262_i2c_id,
+};
+
+static int __init aic3262_i2c_init(void)
+{
+ int ret;
+ ret = i2c_add_driver(&aic3262_i2c_driver);
+ if (ret != 0)
+ pr_err("Failed to register aic3262 I2C driver: %d\n", ret);
+
+ return ret;
+}
+module_init(aic3262_i2c_init);
+
+static void __exit aic3262_i2c_exit(void)
+{
+ i2c_del_driver(&aic3262_i2c_driver);
+}
+module_exit(aic3262_i2c_exit);
+#endif
+#if defined(CONFIG_SPI_MASTER)
+/* TODO: UGLY
+ * NVidia's CS differs from what TI requires on the SPI bus. So before
+ * we do any write/read we pull down the CS gpio :(
+ * The problem is in spi_read.
+ * Can we set the flag spi_transfer.cs_change during read so that CS is
+ * pulled low until the next transaction occurs
+ * (spi_read requires a spi_write followed by spi_read)
+ */
+#include <linux/gpio.h>
+#include "../../../arch/arm/mach-tegra/gpio-names.h"
+#include <linux/delay.h>
+#define SPI_CS TEGRA_GPIO_PX3
+#define CS(a) gpio_set_value(SPI_CS, a)
+void nvidia_spi_cs_en(bool stop)
+{
+ if (stop) {
+ CS(1);
+ udelay(1);
+ } else {
+ CS(0);
+ udelay(1);
+ }
+ return;
+}
+static int aic3262_spi_read_device(struct aic3262 *aic3262, unsigned int reg,
+ int bytes, void *dest)
+{
+ struct spi_device *spi = aic3262->control_data;
+ union aic326x_reg_union *aic_reg = (union aic326x_reg_union *) &reg;
+ u8 *write_read_buf;
+ unsigned int i;
+ unsigned int time;
+ unsigned int last_count;
+ unsigned int spi_read_bufsize = max(32, SMP_CACHE_BYTES)-1;
+ struct spi_message message;
+ struct spi_transfer x[2];
+ int ret;
+ u8 buf[2];
+ u8 page, book, offset;
+ page = aic_reg->aic326x_register.page;
+ book = aic_reg->aic326x_register.book;
+ offset = aic_reg->aic326x_register.offset;
+ if (aic3262->book_no != book) {
+ /* We should change to page 0.
+ Change the book by writing to offset 127 of page 0
+ Change the page back to whatever was set before change page */
+
+ buf[0] = 0x0;
+ buf[1] = 0x0;
+
+ nvidia_spi_cs_en(0);
+ ret = spi_write(spi, (unsigned char *)buf, 2);
+ nvidia_spi_cs_en(1);
+
+ if (ret < 0)
+ return ret;
+ buf[0] = (127 << 1) ;
+ buf[1] = book;
+
+ nvidia_spi_cs_en(0);
+ ret = spi_write(spi, (unsigned char *)buf, 2);
+ nvidia_spi_cs_en(1);
+
+ if (ret < 0)
+ return ret;
+ aic3262->book_no = book;
+ aic3262->page_no = 0x0;
+ }
+
+ if (aic3262->page_no != page) {
+ buf[0] = 0x0;
+ buf[1] = page;
+
+ nvidia_spi_cs_en(0);
+ ret = spi_write(spi, (unsigned char *)buf, 2);
+ nvidia_spi_cs_en(1);
+
+ if (ret < 0)
+ return ret;
+ aic3262->page_no = page;
+ }
+
+ buf[0] = (offset << 1) | (0x01) ;
+ memset(x, 0, sizeof x);
+ spi_message_init(&message);
+ x[0].len = 1;
+ x[0].tx_buf = buf;
+ x[1].len = bytes;
+ x[1].rx_buf = dest ;
+
+ spi_message_add_tail(&x[0], &message);
+ spi_message_add_tail(&x[1], &message);
+
+ nvidia_spi_cs_en(0);
+ ret = spi_sync(spi, &message);
+ nvidia_spi_cs_en(1);
+ if (ret < 0)
+ return ret;
+
+ return bytes;
+
+}
+/* NVidia's CS differs from what TI requires on the SPI bus. So before
+ * we do any write/read we pull down the CS gpio :(
+ */
+static int aic3262_spi_write_device(struct aic3262 *aic3262, unsigned int reg,
+ int bytes, const void *src)
+{
+ struct spi_device *spi = aic3262->control_data;
+ int ret;
+
+ union aic326x_reg_union *aic_reg = (union aic326x_reg_union *) &reg;
+
+ u8 buf[2];
+ u8 write_buf[bytes + 1];
+ u8 page, book, offset;
+ page = aic_reg->aic326x_register.page;
+ book = aic_reg->aic326x_register.book;
+ offset = aic_reg->aic326x_register.offset;
+ if (aic3262->book_no != book) {
+ /* We should change to page 0.
+ Change the book by writing to offset 127 of page 0
+ Change the page back to whatever was set before change page */
+
+ buf[0] = 0x0;
+ buf[1] = 0x0;
+
+ nvidia_spi_cs_en(0);
+ ret = spi_write(spi, (unsigned char *)buf, 2);
+ nvidia_spi_cs_en(1);
+
+ if (ret < 0)
+ return ret;
+ buf[0] = (127 << 1) ;
+ buf[1] = book;
+
+ nvidia_spi_cs_en(0);
+ ret = spi_write(spi, (unsigned char *)buf, 2);
+ nvidia_spi_cs_en(1);
+
+ if (ret < 0)
+ return ret;
+ aic3262->book_no = book;
+ aic3262->page_no = 0x0;
+ }
+
+ if (aic3262->page_no != page) {
+ buf[0] = 0x0;
+ buf[1] = page;
+ nvidia_spi_cs_en(0);
+ ret = spi_write(spi, (unsigned char *) buf, 2);
+ nvidia_spi_cs_en(1);
+ if (ret < 0)
+ return ret;
+ aic3262->page_no = page;
+ }
+ write_buf[0] = offset << 1 ;
+ memcpy(&write_buf[1], src, bytes);
+ nvidia_spi_cs_en(0);
+ ret = spi_write(spi, write_buf, bytes + 1);
+ nvidia_spi_cs_en(1);
+ if (ret < 0)
+ return ret;
+
+ return bytes;
+}
+
+static int aic3262_spi_probe(struct spi_device *spi)
+{
+ struct aic3262 *aic3262;
+
+ aic3262 = kzalloc(sizeof(struct aic3262), GFP_KERNEL);
+ if (aic3262 == NULL)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, aic3262);
+ aic3262->dev = &spi->dev;
+ aic3262->control_data = spi;
+ aic3262->read_dev = aic3262_spi_read_device;
+ aic3262->write_dev = aic3262_spi_write_device;
+ spi->bits_per_word = 8;
+ spi->mode = SPI_MODE_1;
+ spi->max_speed_hz = 4000*1000;
+ spi_setup(spi);
+
+ if (strcmp(spi->modalias, "tlv320aic3262") == 0)
+ aic3262->type = TLV320AIC3262;
+ aic3262->book_no = 255;
+ aic3262->page_no = 255;
+
+ return aic3262_device_init(aic3262, spi->irq);
+}
+
+static int aic3262_spi_remove(struct spi_device *spi)
+{
+ struct aic3262 *aic3262 = spi_get_drvdata(spi);
+
+ aic3262_device_exit(aic3262);
+
+ return 0;
+}
+
+static struct spi_driver aic3262_spi_driver = {
+ .driver = {
+ .name = "tlv320aic3262",
+ .owner = THIS_MODULE,
+ .pm = &aic3262_pm_ops,
+ },
+ .probe = aic3262_spi_probe,
+ .remove = aic3262_spi_remove,
+};
+
+static int __init aic3262_spi_init(void)
+{
+ int ret;
+ ret = spi_register_driver(&aic3262_spi_driver);
+ if (ret != 0)
+ pr_err("Failed to register aic3262 SPI driver: %d\n", ret);
+
+ return ret;
+}
+module_init(aic3262_spi_init);
+
+static void __exit aic3262_spi_exit(void)
+{
+ spi_unregister_driver(&aic3262_spi_driver);
+}
+module_exit(aic3262_spi_exit);
+#endif
+
+MODULE_DESCRIPTION("Core support for the TLV320AIC3262 audio CODEC");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mukund Navada <navada@ti.com>");
generated by cgit v1.2.3 (git 2.0.4) at 2025-01-15 09:08:34 +0000