- 根目录:
- drivers
- mfd
- twl6040-core.c
/*
* 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>
#define VIBRACTRL_MEMBER(reg) ((reg == TWL6040_REG_VIBCTLL) ? 0 : 1)
int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
{
int ret;
u8 val = 0;
mutex_lock(&twl6040->io_mutex);
/* Vibra control registers from cache */
if (unlikely(reg == TWL6040_REG_VIBCTLL ||
reg == TWL6040_REG_VIBCTLR)) {
val = twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)];
} else {
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);
/* Cache the vibra control registers */
if (reg == TWL6040_REG_VIBCTLL || reg == TWL6040_REG_VIBCTLR)
twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)] = val;
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,
"Thermal shutdown, powering-off");
twl6040_power(twl6040, 0);
} else {
dev_warn(twl6040->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,
"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,
"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,
"manual power-up failed\n");
twl6040->power_count = 0;
goto out;
}
}
/* Default PLL configuration after power up */
twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;
twl6040->sysclk = 19200000;
twl6040->mclk = 32768;
} else {
/* already powered-down */
if (!twl6040->power_count) {
dev_err(twl6040->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->sysclk = 0;
twl6040->mclk = 0;
}
out:
mutex_unlock(&twl6040->mutex);
return ret;
}
EXPORT_SYMBOL(twl6040_power);
int twl6040_set_pll(struct twl6040 *twl6040, int pll_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);
/* Force full reconfiguration when switching between PLL */
if (pll_id != twl6040->pll) {
twl6040->sysclk = 0;
twl6040->mclk = 0;
}
switch (pll_id) {
case TWL6040_SYSCLK_SEL_LPPLL:
/* low-power PLL divider */
/* Change the sysclk configuration only if it has been canged */
if (twl6040->sysclk != freq_out) {
switch (freq_out) {
case 17640000:
lppllctl |= TWL6040_LPLLFIN;
break;
case 19200000:
lppllctl &= ~TWL6040_LPLLFIN;
break;
default:
dev_err(twl6040->dev,
"freq_out %d not supported\n",
freq_out);
ret = -EINVAL;
goto pll_out;
}
twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
lppllctl);
}
/* The PLL in use has not been change, we can exit */
if (twl6040->pll == pll_id)
break;
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,
"freq_in %d not supported\n", freq_in);
ret = -EINVAL;
goto pll_out;
}
break;
case TWL6040_SYSCLK_SEL_HPPLL:
/* high-performance PLL can provide only 19.2 MHz */
if (freq_out != 19200000) {
dev_err(twl6040->dev,
"freq_out %d not supported\n", freq_out);
ret = -EINVAL;
goto pll_out;
}
if (twl6040->mclk != freq_in) {
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,
"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);
}
break;
default:
dev_err(twl6040->dev, "unknown pll id %d\n", pll_id);
ret = -EINVAL;
goto pll_out;
}
twl6040->sysclk = freq_out;
twl6040->mclk = freq_in;
twl6040->pll = pll_id;
pll_out:
mutex_unlock(&twl6040->mutex);
return ret;
}
EXPORT_SYMBOL(twl6040_set_pll);
int twl6040_get_pll(struct twl6040 *twl6040)
{
if (twl6040->power_count)
return twl6040->pll;
else
return -ENODEV;
}
EXPORT_SYMBOL(twl6040_get_pll);
unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
{
return twl6040->sysclk;
}
EXPORT_SYMBOL(twl6040_get_sysclk);
/* Get the combined status of the vibra control register */
int twl6040_get_vibralr_status(struct twl6040 *twl6040)
{
u8 status;
status = twl6040->vibra_ctrl_cache[0] | twl6040->vibra_ctrl_cache[1];
status &= (TWL6040_VIBENA | TWL6040_VIBSEL);
return status;
}
EXPORT_SYMBOL(twl6040_get_vibralr_status);
static struct resource twl6040_vibra_rsrc[] = {
{
.flags = IORESOURCE_IRQ,
},
};
static struct resource twl6040_codec_rsrc[] = {
{
.flags = IORESOURCE_IRQ,
},
};
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;
}
/* In order to operate correctly we need valid interrupt config */
if (!pdata->naudint_irq || !pdata->irq_base) {
dev_err(&pdev->dev, "Invalid IRQ configuration\n");
return -EINVAL;
}
twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
if (!twl6040)
return -ENOMEM;
platform_set_drvdata(pdev, twl6040);
twl6040->dev = &pdev->dev;
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);
/* ERRATA: Automatic power-up is not possible in ES1.0 */
if (twl6040_get_revid(twl6040) > TWL6040_REV_ES1_0)
twl6040->audpwron = pdata->audpwron_gpio;
else
twl6040->audpwron = -EINVAL;
if (gpio_is_valid(twl6040->audpwron)) {
ret = gpio_request_one(twl6040->audpwron, GPIOF_OUT_INIT_LOW,
"audpwron");
if (ret)
goto gpio1_err;
}
/* codec interrupt */
ret = twl6040_irq_init(twl6040);
if (ret)
goto gpio2_err;
ret = request_threaded_irq(twl6040->irq_base + TWL6040_IRQ_READY,
NULL, 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) {
int irq = twl6040->irq_base + TWL6040_IRQ_PLUG;
cell = &twl6040->cells[children];
cell->name = "twl6040-codec";
twl6040_codec_rsrc[0].start = irq;
twl6040_codec_rsrc[0].end = irq;
cell->resources = twl6040_codec_rsrc;
cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc);
cell->platform_data = pdata->codec;
cell->pdata_size = sizeof(*pdata->codec);
children++;
}
if (pdata->vibra) {
int irq = twl6040->irq_base + TWL6040_IRQ_VIB;
cell = &twl6040->cells[children];
cell->name = "twl6040-vibra";
twl6040_vibra_rsrc[0].start = irq;
twl6040_vibra_rsrc[0].end = irq;
cell->resources = twl6040_vibra_rsrc;
cell->num_resources = ARRAY_SIZE(twl6040_vibra_rsrc);
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:
free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
irq_err:
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);
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);
free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
twl6040_irq_exit(twl6040);
mfd_remove_devices(&pdev->dev);
platform_set_drvdata(pdev, NULL);
kfree(twl6040);
return 0;
}
static struct platform_driver twl6040_driver = {
.probe = twl6040_probe,
.remove = __devexit_p(twl6040_remove),
.driver = {
.owner = THIS_MODULE,
.name = "twl6040",
},
};
module_platform_driver(twl6040_driver);
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");