mfd: twl6040: Add initial support

TWL6040 IC provides analog high-end audio codec functions for
handset applications. It contains several audio analog inputs
and outputs as well as vibrator support. It's connected to the
host processor via PDM interface for audio data communication.
The audio modules are controlled by internal registers that
can be accessed by I2C and PDM interface.

TWL6040 MFD will be registered as a child of TWL-CORE, and will
have two children of its own: twl6040-codec and twl6040-vibra.

This driver is based on TWL4030 and WM8350 MFD drivers.

Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 596 insertions, 0 deletions

diff --git a/drivers/mfd/twl6040-core.c b/drivers/mfd/twl6040-core.c
new file mode 100644
index 000000000000..57ae36bae807
--- /dev/null
+++ b/drivers/mfd/twl6040-core.c
@@ -0,0 +1,596 @@
+/*
+ * MFD driver for TWL6040 audio device
+ *
+ * Authors:	Misael Lopez Cruz <misael.lopez@ti.com>
+ *		Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
+ *		Peter Ujfalusi <peter.ujfalusi@ti.com>
+ *
+ * Copyright:	(C) 2011 Texas Instruments, Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/i2c/twl.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/twl6040.h>
+
+static struct platform_device *twl6040_dev;
+
+int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
+{
+	int ret;
+	u8 val = 0;
+
+	mutex_lock(&twl6040->io_mutex);
+	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
+	if (ret < 0) {
+		mutex_unlock(&twl6040->io_mutex);
+		return ret;
+	}
+	mutex_unlock(&twl6040->io_mutex);
+
+	return val;
+}
+EXPORT_SYMBOL(twl6040_reg_read);
+
+int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
+{
+	int ret;
+
+	mutex_lock(&twl6040->io_mutex);
+	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
+	mutex_unlock(&twl6040->io_mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL(twl6040_reg_write);
+
+int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
+{
+	int ret;
+	u8 val;
+
+	mutex_lock(&twl6040->io_mutex);
+	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
+	if (ret)
+		goto out;
+
+	val |= mask;
+	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
+out:
+	mutex_unlock(&twl6040->io_mutex);
+	return ret;
+}
+EXPORT_SYMBOL(twl6040_set_bits);
+
+int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
+{
+	int ret;
+	u8 val;
+
+	mutex_lock(&twl6040->io_mutex);
+	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
+	if (ret)
+		goto out;
+
+	val &= ~mask;
+	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
+out:
+	mutex_unlock(&twl6040->io_mutex);
+	return ret;
+}
+EXPORT_SYMBOL(twl6040_clear_bits);
+
+/* twl6040 codec manual power-up sequence */
+static int twl6040_power_up(struct twl6040 *twl6040)
+{
+	u8 ldoctl, ncpctl, lppllctl;
+	int ret;
+
+	/* enable high-side LDO, reference system and internal oscillator */
+	ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA;
+	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+	if (ret)
+		return ret;
+	usleep_range(10000, 10500);
+
+	/* enable negative charge pump */
+	ncpctl = TWL6040_NCPENA;
+	ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
+	if (ret)
+		goto ncp_err;
+	usleep_range(1000, 1500);
+
+	/* enable low-side LDO */
+	ldoctl |= TWL6040_LSLDOENA;
+	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+	if (ret)
+		goto lsldo_err;
+	usleep_range(1000, 1500);
+
+	/* enable low-power PLL */
+	lppllctl = TWL6040_LPLLENA;
+	ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+	if (ret)
+		goto lppll_err;
+	usleep_range(5000, 5500);
+
+	/* disable internal oscillator */
+	ldoctl &= ~TWL6040_OSCENA;
+	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+	if (ret)
+		goto osc_err;
+
+	return 0;
+
+osc_err:
+	lppllctl &= ~TWL6040_LPLLENA;
+	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+lppll_err:
+	ldoctl &= ~TWL6040_LSLDOENA;
+	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+lsldo_err:
+	ncpctl &= ~TWL6040_NCPENA;
+	twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
+ncp_err:
+	ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
+	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+
+	return ret;
+}
+
+/* twl6040 manual power-down sequence */
+static void twl6040_power_down(struct twl6040 *twl6040)
+{
+	u8 ncpctl, ldoctl, lppllctl;
+
+	ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
+	ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
+	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
+
+	/* enable internal oscillator */
+	ldoctl |= TWL6040_OSCENA;
+	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+	usleep_range(1000, 1500);
+
+	/* disable low-power PLL */
+	lppllctl &= ~TWL6040_LPLLENA;
+	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+
+	/* disable low-side LDO */
+	ldoctl &= ~TWL6040_LSLDOENA;
+	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+
+	/* disable negative charge pump */
+	ncpctl &= ~TWL6040_NCPENA;
+	twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
+
+	/* disable high-side LDO, reference system and internal oscillator */
+	ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
+	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
+}
+
+static irqreturn_t twl6040_naudint_handler(int irq, void *data)
+{
+	struct twl6040 *twl6040 = data;
+	u8 intid, status;
+
+	intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
+
+	if (intid & TWL6040_READYINT)
+		complete(&twl6040->ready);
+
+	if (intid & TWL6040_THINT) {
+		status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
+		if (status & TWL6040_TSHUTDET) {
+			dev_warn(&twl6040_dev->dev,
+				 "Thermal shutdown, powering-off");
+			twl6040_power(twl6040, 0);
+		} else {
+			dev_warn(&twl6040_dev->dev,
+				 "Leaving thermal shutdown, powering-on");
+			twl6040_power(twl6040, 1);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int twl6040_power_up_completion(struct twl6040 *twl6040,
+				       int naudint)
+{
+	int time_left;
+	u8 intid;
+
+	time_left = wait_for_completion_timeout(&twl6040->ready,
+						msecs_to_jiffies(144));
+	if (!time_left) {
+		intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
+		if (!(intid & TWL6040_READYINT)) {
+			dev_err(&twl6040_dev->dev,
+				"timeout waiting for READYINT\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+int twl6040_power(struct twl6040 *twl6040, int on)
+{
+	int audpwron = twl6040->audpwron;
+	int naudint = twl6040->irq;
+	int ret = 0;
+
+	mutex_lock(&twl6040->mutex);
+
+	if (on) {
+		/* already powered-up */
+		if (twl6040->power_count++)
+			goto out;
+
+		if (gpio_is_valid(audpwron)) {
+			/* use AUDPWRON line */
+			gpio_set_value(audpwron, 1);
+			/* wait for power-up completion */
+			ret = twl6040_power_up_completion(twl6040, naudint);
+			if (ret) {
+				dev_err(&twl6040_dev->dev,
+					"automatic power-down failed\n");
+				twl6040->power_count = 0;
+				goto out;
+			}
+		} else {
+			/* use manual power-up sequence */
+			ret = twl6040_power_up(twl6040);
+			if (ret) {
+				dev_err(&twl6040_dev->dev,
+					"manual power-up failed\n");
+				twl6040->power_count = 0;
+				goto out;
+			}
+		}
+		twl6040->pll = TWL6040_LPPLL_ID;
+		twl6040->sysclk = 19200000;
+	} else {
+		/* already powered-down */
+		if (!twl6040->power_count) {
+			dev_err(&twl6040_dev->dev,
+				"device is already powered-off\n");
+			ret = -EPERM;
+			goto out;
+		}
+
+		if (--twl6040->power_count)
+			goto out;
+
+		if (gpio_is_valid(audpwron)) {
+			/* use AUDPWRON line */
+			gpio_set_value(audpwron, 0);
+
+			/* power-down sequence latency */
+			usleep_range(500, 700);
+		} else {
+			/* use manual power-down sequence */
+			twl6040_power_down(twl6040);
+		}
+		twl6040->pll = TWL6040_NOPLL_ID;
+		twl6040->sysclk = 0;
+	}
+
+out:
+	mutex_unlock(&twl6040->mutex);
+	return ret;
+}
+EXPORT_SYMBOL(twl6040_power);
+
+int twl6040_set_pll(struct twl6040 *twl6040, enum twl6040_pll_id id,
+		    unsigned int freq_in, unsigned int freq_out)
+{
+	u8 hppllctl, lppllctl;
+	int ret = 0;
+
+	mutex_lock(&twl6040->mutex);
+
+	hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
+	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
+
+	switch (id) {
+	case TWL6040_LPPLL_ID:
+		/* low-power PLL divider */
+		switch (freq_out) {
+		case 17640000:
+			lppllctl |= TWL6040_LPLLFIN;
+			break;
+		case 19200000:
+			lppllctl &= ~TWL6040_LPLLFIN;
+			break;
+		default:
+			dev_err(&twl6040_dev->dev,
+				"freq_out %d not supported\n", freq_out);
+			ret = -EINVAL;
+			goto pll_out;
+		}
+		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+
+		switch (freq_in) {
+		case 32768:
+			lppllctl |= TWL6040_LPLLENA;
+			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
+					  lppllctl);
+			mdelay(5);
+			lppllctl &= ~TWL6040_HPLLSEL;
+			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
+					  lppllctl);
+			hppllctl &= ~TWL6040_HPLLENA;
+			twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
+					  hppllctl);
+			break;
+		default:
+			dev_err(&twl6040_dev->dev,
+				"freq_in %d not supported\n", freq_in);
+			ret = -EINVAL;
+			goto pll_out;
+		}
+
+		twl6040->pll = TWL6040_LPPLL_ID;
+		break;
+	case TWL6040_HPPLL_ID:
+		/* high-performance PLL can provide only 19.2 MHz */
+		if (freq_out != 19200000) {
+			dev_err(&twl6040_dev->dev,
+				"freq_out %d not supported\n", freq_out);
+			ret = -EINVAL;
+			goto pll_out;
+		}
+
+		hppllctl &= ~TWL6040_MCLK_MSK;
+
+		switch (freq_in) {
+		case 12000000:
+			/* PLL enabled, active mode */
+			hppllctl |= TWL6040_MCLK_12000KHZ |
+				    TWL6040_HPLLENA;
+			break;
+		case 19200000:
+			/*
+			 * PLL disabled
+			 * (enable PLL if MCLK jitter quality
+			 *  doesn't meet specification)
+			 */
+			hppllctl |= TWL6040_MCLK_19200KHZ;
+			break;
+		case 26000000:
+			/* PLL enabled, active mode */
+			hppllctl |= TWL6040_MCLK_26000KHZ |
+				    TWL6040_HPLLENA;
+			break;
+		case 38400000:
+			/* PLL enabled, active mode */
+			hppllctl |= TWL6040_MCLK_38400KHZ |
+				    TWL6040_HPLLENA;
+			break;
+		default:
+			dev_err(&twl6040_dev->dev,
+				"freq_in %d not supported\n", freq_in);
+			ret = -EINVAL;
+			goto pll_out;
+		}
+
+		/* enable clock slicer to ensure input waveform is square */
+		hppllctl |= TWL6040_HPLLSQRENA;
+
+		twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl);
+		usleep_range(500, 700);
+		lppllctl |= TWL6040_HPLLSEL;
+		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+		lppllctl &= ~TWL6040_LPLLENA;
+		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
+
+		twl6040->pll = TWL6040_HPPLL_ID;
+		break;
+	default:
+		dev_err(&twl6040_dev->dev, "unknown pll id %d\n", id);
+		ret = -EINVAL;
+		goto pll_out;
+	}
+
+	twl6040->sysclk = freq_out;
+
+pll_out:
+	mutex_unlock(&twl6040->mutex);
+	return ret;
+}
+EXPORT_SYMBOL(twl6040_set_pll);
+
+enum twl6040_pll_id twl6040_get_pll(struct twl6040 *twl6040)
+{
+	return twl6040->pll;
+}
+EXPORT_SYMBOL(twl6040_get_pll);
+
+unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
+{
+	return twl6040->sysclk;
+}
+EXPORT_SYMBOL(twl6040_get_sysclk);
+
+static int __devinit twl6040_probe(struct platform_device *pdev)
+{
+	struct twl4030_audio_data *pdata = pdev->dev.platform_data;
+	struct twl6040 *twl6040;
+	struct mfd_cell *cell = NULL;
+	int ret, children = 0;
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "Platform data is missing\n");
+		return -EINVAL;
+	}
+
+	twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
+	if (!twl6040)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, twl6040);
+
+	twl6040_dev = pdev;
+	twl6040->dev = &pdev->dev;
+	twl6040->audpwron = pdata->audpwron_gpio;
+	twl6040->irq = pdata->naudint_irq;
+	twl6040->irq_base = pdata->irq_base;
+
+	mutex_init(&twl6040->mutex);
+	mutex_init(&twl6040->io_mutex);
+	init_completion(&twl6040->ready);
+
+	twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);
+
+	if (gpio_is_valid(twl6040->audpwron)) {
+		ret = gpio_request(twl6040->audpwron, "audpwron");
+		if (ret)
+			goto gpio1_err;
+
+		ret = gpio_direction_output(twl6040->audpwron, 0);
+		if (ret)
+			goto gpio2_err;
+	}
+
+	/* ERRATA: Automatic power-up is not possible in ES1.0 */
+	if (twl6040->rev == TWL6040_REV_ES1_0)
+		twl6040->audpwron = -EINVAL;
+
+	if (twl6040->irq) {
+		/* codec interrupt */
+		ret = twl6040_irq_init(twl6040);
+		if (ret)
+			goto gpio2_err;
+
+		ret = twl6040_request_irq(twl6040, TWL6040_IRQ_READY,
+					  twl6040_naudint_handler, 0,
+					  "twl6040_irq_ready", twl6040);
+		if (ret) {
+			dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
+				ret);
+			goto irq_err;
+		}
+	}
+
+	/* dual-access registers controlled by I2C only */
+	twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);
+
+	if (pdata->codec) {
+		cell = &twl6040->cells[children];
+		cell->name = "twl6040-codec";
+		/* The codec expects the twl4030_audio_data as platform data */
+		cell->platform_data = pdata;
+		cell->pdata_size = sizeof(*pdata);
+		children++;
+	}
+
+	if (pdata->vibra) {
+		cell = &twl6040->cells[children];
+		cell->name = "twl6040-vibra";
+		cell->platform_data = pdata->vibra;
+		cell->pdata_size = sizeof(*pdata->vibra);
+		children++;
+	}
+
+	if (children) {
+		ret = mfd_add_devices(&pdev->dev, pdev->id, twl6040->cells,
+				      children, NULL, 0);
+		if (ret)
+			goto mfd_err;
+	} else {
+		dev_err(&pdev->dev, "No platform data found for children\n");
+		ret = -ENODEV;
+		goto mfd_err;
+	}
+
+	return 0;
+
+mfd_err:
+	if (twl6040->irq)
+		twl6040_free_irq(twl6040, TWL6040_IRQ_READY, twl6040);
+irq_err:
+	if (twl6040->irq)
+		twl6040_irq_exit(twl6040);
+gpio2_err:
+	if (gpio_is_valid(twl6040->audpwron))
+		gpio_free(twl6040->audpwron);
+gpio1_err:
+	platform_set_drvdata(pdev, NULL);
+	kfree(twl6040);
+	twl6040_dev = NULL;
+	return ret;
+}
+
+static int __devexit twl6040_remove(struct platform_device *pdev)
+{
+	struct twl6040 *twl6040 = platform_get_drvdata(pdev);
+
+	if (twl6040->power_count)
+		twl6040_power(twl6040, 0);
+
+	if (gpio_is_valid(twl6040->audpwron))
+		gpio_free(twl6040->audpwron);
+
+	twl6040_free_irq(twl6040, TWL6040_IRQ_READY, twl6040);
+
+	if (twl6040->irq)
+		twl6040_irq_exit(twl6040);
+
+	mfd_remove_devices(&pdev->dev);
+	platform_set_drvdata(pdev, NULL);
+	kfree(twl6040);
+	twl6040_dev = NULL;
+
+	return 0;
+}
+
+static struct platform_driver twl6040_driver = {
+	.probe		= twl6040_probe,
+	.remove		= __devexit_p(twl6040_remove),
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= "twl6040",
+	},
+};
+
+static int __devinit twl6040_init(void)
+{
+	return platform_driver_register(&twl6040_driver);
+}
+module_init(twl6040_init);
+
+static void __devexit twl6040_exit(void)
+{
+	platform_driver_unregister(&twl6040_driver);
+}
+
+module_exit(twl6040_exit);
+
+MODULE_DESCRIPTION("TWL6040 MFD");
+MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
+MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:twl6040");