SPI: Add support for TSC2101

The new driver is functionally the same as the old
drivers/ssi/omap-tsc2101 driver in the linux-omap tree.
Signed-off-by: Imre Deak <imre.deak@solidboot.com>

drivers/spi/Kconfig

@@ -183,6 +183,14 @@ config SPI_AT25
 	  This driver can also be built as a module.  If so, the module
 	  will be called at25.
 
+config SPI_TSC2101
+       depends on SPI_MASTER
+       tristate "TSC2101 chip support"
+       ---help---
+         Say Y here if you want support for the TSC2101 chip.
+	 At the moment it provides basic register read / write interface
+	 as well as a way to enable the MCLK clock.
+	 
 config SPI_SPIDEV
 	tristate "User mode SPI device driver support"
 	depends on SPI_MASTER && EXPERIMENTAL

drivers/spi/Makefile

@@ -29,6 +29,7 @@ obj-$(CONFIG_SPI_S3C24XX)		+= spi_s3c24xx.o
 # SPI protocol drivers (device/link on bus)
 obj-$(CONFIG_SPI_AT25)		+= at25.o
 obj-$(CONFIG_SPI_SPIDEV)	+= spidev.o
+obj-$(CONFIG_SPI_TSC2101)	+= tsc2101.o
 # 	... add above this line ...
 
 # SPI slave controller drivers (upstream link)

drivers/spi/tsc2101.c

+/*
+ * linux/drivers/spi/tsc2101.c
+ *
+ * TSC2101 codec interface driver for the OMAP platform
+ *
+ * Copyright (C) 2004 Texas Instruments, Inc.
+ *
+ * This package 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.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * History:
+ *
+ * 2004/11/07   Nishanth Menon - Modified for common hooks for Audio and Touchscreen
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/tsc2101.h>
+
+struct tsc2101_device {
+	struct mutex		mutex;
+	int			mclk_enabled;
+	struct clock		*mclk_ck;
+	struct spi_message	message;
+	struct spi_transfer	transfer[2];
+	u16			command;
+	void			(*enable_mclk)(struct spi_device *spi);
+	void			(*disable_mclk)(struct spi_device *spi);
+};
+
+int tsc2101_enable_mclk(struct spi_device *spi)
+{
+	struct tsc2101_device *tsc2101;
+
+	tsc2101 = spi_get_drvdata(spi);
+
+	mutex_lock(&tsc2101->mutex);
+
+	if (spi->dev.power.power_state.event != PM_EVENT_ON) {
+		mutex_unlock(&tsc2101->mutex);
+		return -ENODEV;
+	}
+
+	if (tsc2101->mclk_enabled++ == 0) {
+		if (tsc2101->enable_mclk != NULL)
+			tsc2101->enable_mclk(spi);
+	}
+
+	mutex_unlock(&tsc2101->mutex);
+	return 0;
+}
+EXPORT_SYMBOL(tsc2101_enable_mclk);
+
+void tsc2101_disable_mclk(struct spi_device *spi)
+{
+	struct tsc2101_device *tsc2101;
+
+	tsc2101 = spi_get_drvdata(spi);
+
+	mutex_lock(&tsc2101->mutex);
+
+	if (--tsc2101->mclk_enabled == 0) {
+		if (tsc2101->disable_mclk != NULL &&
+		    spi->dev.power.power_state.event == PM_EVENT_ON)
+			tsc2101->disable_mclk(spi);
+	}
+
+	mutex_lock(&tsc2101->mutex);
+}
+EXPORT_SYMBOL(tsc2101_disable_mclk);
+
+int tsc2101_write_sync(struct spi_device *spi, int page, u8 address, u16 data)
+{
+	struct tsc2101_device *tsc2101;
+	struct spi_message *m;
+	struct spi_transfer *t;
+	int ret;
+
+	tsc2101 = spi_get_drvdata(spi);
+
+	mutex_lock(&tsc2101->mutex);
+	if (spi->dev.power.power_state.event != PM_EVENT_ON) {
+		mutex_unlock(&tsc2101->mutex);
+		return -ENODEV;
+	}
+
+	m = &tsc2101->message;
+	spi_message_init(m);
+	t = &tsc2101->transfer[0];
+	memset(t, 0, sizeof(tsc2101->transfer));
+
+	/* Address */
+	tsc2101->command = (page << 11) | (address << 5);
+	t->tx_buf = &tsc2101->command;
+	t->len = 2;
+	spi_message_add_tail(t, m);
+
+	/* Data */
+	t++;
+	t->tx_buf = &data;
+	t->len = 2;
+	spi_message_add_tail(t, m);
+
+	ret = spi_sync(spi, m);
+	if (!ret)
+		ret = tsc2101->message.status;
+	mutex_unlock(&tsc2101->mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL(tsc2101_write_sync);
+
+int tsc2101_reads_sync(struct spi_device *spi,
+		       int page, u8 startaddress, u16 *data, int numregs)
+{
+	struct tsc2101_device *tsc2101;
+	struct spi_message *m;
+	struct spi_transfer *t;
+	int ret;
+
+	tsc2101 = spi_get_drvdata(spi);
+
+	mutex_lock(&tsc2101->mutex);
+	if (spi->dev.power.power_state.event != PM_EVENT_ON) {
+		mutex_unlock(&tsc2101->mutex);
+		return -ENODEV;
+	}
+
+	m = &tsc2101->message;
+	spi_message_init(m);
+	t = &tsc2101->transfer[0];
+	memset(t, 0, sizeof(tsc2101->transfer));
+
+	/* Address */
+	tsc2101->command = 0x8000 | (page << 11) | (startaddress << 5);
+	t->tx_buf = &tsc2101->command;
+	t->len = 2;
+	spi_message_add_tail(t, m);
+
+	/* Data */
+	t++;
+	t->rx_buf = data;
+	t->len = numregs << 1;
+	spi_message_add_tail(t, m);
+
+	ret = spi_sync(spi, m);
+	if (!ret)
+		ret = tsc2101->message.status;
+
+	mutex_unlock(&tsc2101->mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL(tsc2101_reads_sync);
+
+int tsc2101_read_sync(struct spi_device *spi, int page, u8 address)
+{
+	int err;
+	u16 val;
+
+	err = tsc2101_reads_sync(spi, page, address, &val, 1);
+	if (err)
+		return err;
+	return val;
+}
+EXPORT_SYMBOL(tsc2101_read_sync);
+
+static int tsc2101_suspend(struct spi_device *spi, pm_message_t state)
+{
+	struct tsc2101_device *tsc2101;
+
+	tsc2101 = spi_get_drvdata(spi);
+
+	if (tsc2101 == NULL)
+		return 0;
+
+	mutex_lock(&tsc2101->mutex);
+
+	spi->dev.power.power_state = state;
+	if (tsc2101->mclk_enabled && tsc2101->disable_mclk != NULL)
+		tsc2101->disable_mclk(spi);
+
+	mutex_unlock(&tsc2101->mutex);
+
+	return 0;
+}
+
+static int tsc2101_resume(struct spi_device *spi)
+{
+	struct tsc2101_device *tsc2101;
+
+	tsc2101 = spi_get_drvdata(spi);
+
+	if (tsc2101 == NULL)
+		return 0;
+
+	mutex_lock(&tsc2101->mutex);
+
+	spi->dev.power.power_state = PMSG_ON;
+	if (tsc2101->mclk_enabled && tsc2101->enable_mclk != NULL)
+		tsc2101->enable_mclk(spi);
+
+	mutex_unlock(&tsc2101->mutex);
+
+	return 0;
+}
+
+static int tsc2101_probe(struct spi_device *spi)
+{
+	struct tsc2101_platform_data *pdata;
+	struct tsc2101_device *tsc2101;
+	u16 w;
+	int r;
+
+	pdata = spi->dev.platform_data;
+	if (pdata == NULL) {
+		dev_err(&spi->dev, "no platform data\n");
+		return -ENODEV;
+	}
+
+	tsc2101 = kzalloc(sizeof(*tsc2101), GFP_KERNEL);
+	if (tsc2101 == NULL) {
+		dev_err(&spi->dev, "out of mem\n");
+		return -ENOMEM;
+	}
+
+	spi_set_drvdata(spi, tsc2101);
+	tsc2101->enable_mclk = pdata->enable_mclk;
+	tsc2101->disable_mclk = pdata->disable_mclk;
+
+	mutex_init(&tsc2101->mutex);
+
+	spi->mode = SPI_MODE_0;
+	spi->bits_per_word = 16;
+	if ((r = spi_setup(spi)) < 0) {
+		dev_err(&spi->dev, "SPI setup failed\n");
+		goto err;
+	}
+
+	w = tsc2101_read_sync(spi, 1, 0);
+	if (!(w & (1 << 14))) {
+		dev_err(&spi->dev, "invalid ADC register value %04x\n", w);
+		goto err;
+	}
+
+	if (pdata->init != NULL) {
+		if ((r = pdata->init(spi)) < 0) {
+			dev_err(&spi->dev, "platform init failed\n");
+			goto err;
+		}
+	}
+
+	dev_info(&spi->dev, "initialized\n");
+
+	return 0;
+err:
+	kfree(tsc2101);
+	return r;
+}
+
+static int tsc2101_remove(struct spi_device *spi)
+{
+	struct tsc2101_platform_data *pdata;
+	struct tsc2101_device *tsc2101;
+
+	pdata = spi->dev.platform_data;
+	tsc2101 = spi_get_drvdata(spi);
+
+	/* We assume that this can't race with the rest of the driver. */
+	if (tsc2101->mclk_enabled && tsc2101->disable_mclk != NULL)
+		tsc2101->disable_mclk(spi);
+
+	if (pdata->cleanup != NULL)
+		pdata->cleanup(spi);
+
+	spi_set_drvdata(spi, NULL);
+	kfree(tsc2101);
+
+	return 0;
+}
+
+static struct spi_driver tsc2101_driver = {
+	.probe		= tsc2101_probe,
+	.remove		= tsc2101_remove,
+	.suspend	= tsc2101_suspend,
+	.resume		= tsc2101_resume,
+	.driver		= {
+		.name	= "tsc2101",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int tsc2101_init(void)
+{
+	return spi_register_driver(&tsc2101_driver);
+}
+
+static void tsc2101_exit(void)
+{
+	spi_unregister_driver(&tsc2101_driver);
+}
+
+module_init(tsc2101_init);
+module_exit(tsc2101_exit);
+
+MODULE_AUTHOR("Texas Instruments");
+MODULE_DESCRIPTION
+    ("Glue audio driver for the TI OMAP1610/OMAP1710 TSC2101 codec.");
+MODULE_LICENSE("GPL");

include/linux/spi/tsc2101.h

+/*
+ * include/linux/spi/tsc2101.h
+ *
+ * TSC2101 codec interface driver for the OMAP platform
+ *
+ * Copyright (C) 2004 Texas Instruments, Inc.
+ *
+ * This package 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.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * History:
+ *
+ * 2004/11/07   Nishanth Menon - Provided common hooks for Audio and Touchscreen
+ */
+
+#ifndef __OMAP_TSC2101_H
+#define __OMAP_TSC2101_H
+
+#include <linux/spi/spi.h>
+
+struct tsc2101_platform_data {
+	int	(*init)(struct spi_device *spi);
+	void	(*cleanup)(struct spi_device *spi);
+	void	(*enable_mclk)(struct spi_device *spi);
+	void	(*disable_mclk)(struct spi_device *spi);
+};
+
+extern int tsc2101_read_sync(struct spi_device *spi, int page, u8 address);
+extern int tsc2101_reads_sync(struct spi_device *spi, int page,
+			       u8 startaddress, u16 * data, int numregs);
+extern int tsc2101_write_sync(struct spi_device *spi, int page, u8 address,
+			       u16 data);
+
+extern int tsc2101_enable_mclk(struct spi_device *spi);
+extern void tsc2101_disable_mclk(struct spi_device *spi);
+
+#endif
+