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path: root/drivers/mfd/twl6040-core.c
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Diffstat (limited to 'drivers/mfd/twl6040-core.c')
-rw-r--r--drivers/mfd/twl6040-core.c596
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");
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-13 11:57:50 +0300