[PATCH] Added i2c support for mc13xxx-core
Marc Reilly
marc at cpdesign.com.au
Tue Dec 7 02:14:47 EST 2010
---
drivers/mfd/mc13xxx-core.c | 332 +++++++++++++++++++++++++++++++-------------
1 files changed, 234 insertions(+), 98 deletions(-)
diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
index a2ac2ed..229cf43 100644
--- a/drivers/mfd/mc13xxx-core.c
+++ b/drivers/mfd/mc13xxx-core.c
@@ -9,7 +9,6 @@
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*/
-
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@@ -18,12 +17,28 @@
#include <linux/spi/spi.h>
#include <linux/mfd/core.h>
#include <linux/mfd/mc13xxx.h>
+#include <linux/i2c.h>
+
+enum mc13xxx_id {
+ MC13XXX_ID_MC13783,
+ MC13XXX_ID_MC13892,
+ MC13XXX_ID_INVALID,
+};
struct mc13xxx {
- struct spi_device *spidev;
+ union {
+ struct spi_device *spidev;
+ struct i2c_client* client;
+ };
+ struct device *pdev;
+ enum mc13xxx_id icid;
+
struct mutex lock;
int irq;
+ int (*read_dev)(struct mc13xxx*, unsigned int, u32*);
+ int (*write_dev)(struct mc13xxx*, unsigned int, u32);
+
irq_handler_t irqhandler[MC13XXX_NUM_IRQ];
void *irqdata[MC13XXX_NUM_IRQ];
};
@@ -150,36 +165,46 @@ EXPORT_SYMBOL(mc13783_to_mc13xxx);
void mc13xxx_lock(struct mc13xxx *mc13xxx)
{
if (!mutex_trylock(&mc13xxx->lock)) {
- dev_dbg(&mc13xxx->spidev->dev, "wait for %s from %pf\n",
+ dev_dbg(mc13xxx->pdev, "wait for %s from %pf\n",
__func__, __builtin_return_address(0));
mutex_lock(&mc13xxx->lock);
}
- dev_dbg(&mc13xxx->spidev->dev, "%s from %pf\n",
+ dev_dbg(mc13xxx->pdev, "%s from %pf\n",
__func__, __builtin_return_address(0));
}
EXPORT_SYMBOL(mc13xxx_lock);
void mc13xxx_unlock(struct mc13xxx *mc13xxx)
{
- dev_dbg(&mc13xxx->spidev->dev, "%s from %pf\n",
+ dev_dbg(mc13xxx->pdev, "%s from %pf\n",
__func__, __builtin_return_address(0));
mutex_unlock(&mc13xxx->lock);
}
EXPORT_SYMBOL(mc13xxx_unlock);
-#define MC13XXX_REGOFFSET_SHIFT 25
int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
{
- struct spi_transfer t;
- struct spi_message m;
int ret;
-
BUG_ON(!mutex_is_locked(&mc13xxx->lock));
if (offset > MC13XXX_NUMREGS)
return -EINVAL;
+ ret = mc13xxx->read_dev(mc13xxx, offset, val);
+ dev_vdbg(mc13xxx->pdev, "[0x%02x] -> 0x%06x\n", offset, *val);
+
+ return ret;
+}
+EXPORT_SYMBOL(mc13xxx_reg_read);
+
+#define MC13XXX_REGOFFSET_SHIFT 25
+static int mc13xxx_spi_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
+{
+ struct spi_transfer t;
+ struct spi_message m;
+ int ret;
+
*val = offset << MC13XXX_REGOFFSET_SHIFT;
memset(&t, 0, sizeof(t));
@@ -201,26 +226,28 @@ int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
*val &= 0xffffff;
- dev_vdbg(&mc13xxx->spidev->dev, "[0x%02x] -> 0x%06x\n", offset, *val);
-
return 0;
}
-EXPORT_SYMBOL(mc13xxx_reg_read);
int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
{
- u32 buf;
- struct spi_transfer t;
- struct spi_message m;
- int ret;
-
BUG_ON(!mutex_is_locked(&mc13xxx->lock));
-
- dev_vdbg(&mc13xxx->spidev->dev, "[0x%02x] <- 0x%06x\n", offset, val);
+ dev_vdbg(mc13xxx->pdev, "[0x%02x] <- 0x%06x\n", offset, val);
if (offset > MC13XXX_NUMREGS || val > 0xffffff)
return -EINVAL;
+ return mc13xxx->write_dev(mc13xxx, offset, val);
+}
+EXPORT_SYMBOL(mc13xxx_reg_write);
+
+static int mc13xxx_spi_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
+{
+ u32 buf;
+ struct spi_transfer t;
+ struct spi_message m;
+ int ret;
+
buf = 1 << 31 | offset << MC13XXX_REGOFFSET_SHIFT | val;
memset(&t, 0, sizeof(t));
@@ -241,7 +268,33 @@ int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
return 0;
}
-EXPORT_SYMBOL(mc13xxx_reg_write);
+
+static int mc13xxx_i2c_reg_read(struct mc13xxx *mc13xxx, unsigned int offset,
+ u32 *val)
+{
+ int ret;
+ unsigned char buff[3] = {0,0,0};
+
+ ret = i2c_smbus_read_i2c_block_data(mc13xxx->client, offset, 3, buff);
+ *val = buff[0] << 16 | buff[1] << 8 | buff[2];
+
+ return ret == 3 ? 0 : ret;
+}
+
+static int mc13xxx_i2c_reg_write(struct mc13xxx *mc13xxx, unsigned int offset,
+ u32 val)
+{
+ int ret;
+ unsigned char buff[3];
+
+ buff[0] = (val >> 16) & 0xff;
+ buff[1] = (val >> 8) & 0xff;
+ buff[2] = val & 0xff;
+
+ ret = i2c_smbus_write_i2c_block_data(mc13xxx->client, offset, 3, buff);
+
+ return ret;
+}
int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset,
u32 mask, u32 val)
@@ -445,7 +498,7 @@ static int mc13xxx_irq_handle(struct mc13xxx *mc13xxx,
if (handled == IRQ_HANDLED)
num_handled++;
} else {
- dev_err(&mc13xxx->spidev->dev,
+ dev_err(mc13xxx->pdev,
"BUG: irq %u but no handler\n",
baseirq + irq);
@@ -481,11 +534,6 @@ static irqreturn_t mc13xxx_irq_thread(int irq, void *data)
return IRQ_RETVAL(handled);
}
-enum mc13xxx_id {
- MC13XXX_ID_MC13783,
- MC13XXX_ID_MC13892,
- MC13XXX_ID_INVALID,
-};
const char *mc13xxx_chipname[] = {
[MC13XXX_ID_MC13783] = "mc13783",
@@ -493,41 +541,38 @@ const char *mc13xxx_chipname[] = {
};
#define maskval(reg, mask) (((reg) & (mask)) >> __ffs(mask))
-static int mc13xxx_identify(struct mc13xxx *mc13xxx, enum mc13xxx_id *id)
+static int mc13xxx_identify(struct mc13xxx *mc13xxx, int usespi)
{
u32 icid;
u32 revision;
const char *name;
int ret;
- ret = mc13xxx_reg_read(mc13xxx, 46, &icid);
+ ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
if (ret)
return ret;
- icid = (icid >> 6) & 0x7;
+ icid = (revision >> 6) & 0x7;
switch (icid) {
case 2:
- *id = MC13XXX_ID_MC13783;
+ mc13xxx->icid = MC13XXX_ID_MC13783;
name = "mc13783";
break;
case 7:
- *id = MC13XXX_ID_MC13892;
+ mc13xxx->icid = MC13XXX_ID_MC13892;
name = "mc13892";
break;
default:
- *id = MC13XXX_ID_INVALID;
+ mc13xxx->icid = MC13XXX_ID_INVALID;
break;
}
- if (*id == MC13XXX_ID_MC13783 || *id == MC13XXX_ID_MC13892) {
- ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
- if (ret)
- return ret;
-
- dev_info(&mc13xxx->spidev->dev, "%s: rev: %d.%d, "
+ if (mc13xxx->icid == MC13XXX_ID_MC13783 ||
+ mc13xxx->icid == MC13XXX_ID_MC13892) {
+ dev_info(mc13xxx->pdev, "%s: rev: %d.%d, "
"fin: %d, fab: %d, icid: %d/%d\n",
- mc13xxx_chipname[*id],
+ mc13xxx_chipname[mc13xxx->icid],
maskval(revision, MC13XXX_REVISION_REVFULL),
maskval(revision, MC13XXX_REVISION_REVMETAL),
maskval(revision, MC13XXX_REVISION_FIN),
@@ -535,27 +580,23 @@ static int mc13xxx_identify(struct mc13xxx *mc13xxx, enum mc13xxx_id *id)
maskval(revision, MC13XXX_REVISION_ICID),
maskval(revision, MC13XXX_REVISION_ICIDCODE));
}
-
- if (*id != MC13XXX_ID_INVALID) {
- const struct spi_device_id *devid =
- spi_get_device_id(mc13xxx->spidev);
- if (!devid || devid->driver_data != *id)
- dev_warn(&mc13xxx->spidev->dev, "device id doesn't "
- "match auto detection!\n");
+ if (mc13xxx->icid != MC13XXX_ID_INVALID) {
+ if (usespi) {
+ const struct spi_device_id *devid =
+ spi_get_device_id(mc13xxx->spidev);
+ if (!devid || devid->driver_data != mc13xxx->icid)
+ dev_warn(mc13xxx->pdev, "device id doesn't "
+ "match auto detection!\n");
+ } else {
+ /* TODO */
+ }
}
-
return 0;
}
static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
{
- const struct spi_device_id *devid =
- spi_get_device_id(mc13xxx->spidev);
-
- if (!devid)
- return NULL;
-
- return mc13xxx_chipname[devid->driver_data];
+ return mc13xxx_chipname[mc13xxx->icid];
}
#include <linux/mfd/mc13783.h>
@@ -563,7 +604,7 @@ static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
int mc13xxx_get_flags(struct mc13xxx *mc13xxx)
{
struct mc13xxx_platform_data *pdata =
- dev_get_platdata(&mc13xxx->spidev->dev);
+ dev_get_platdata(mc13xxx->pdev);
return pdata->flags;
}
@@ -601,7 +642,7 @@ int mc13783_adc_do_conversion(struct mc13783 *mc13783, unsigned int mode,
};
init_completion(&adcdone_data.done);
- dev_dbg(&mc13xxx->spidev->dev, "%s\n", __func__);
+ dev_dbg(mc13xxx->pdev, "%s\n", __func__);
mc13xxx_lock(mc13xxx);
@@ -643,7 +684,7 @@ int mc13783_adc_do_conversion(struct mc13783 *mc13783, unsigned int mode,
return -EINVAL;
}
- dev_dbg(&mc13783->mc13xxx.spidev->dev, "%s: request irq\n", __func__);
+ dev_dbg(mc13783->mc13xxx.pdev, "%s: request irq\n", __func__);
mc13xxx_irq_request(mc13xxx, MC13783_IRQ_ADCDONE,
mc13783_handler_adcdone, __func__, &adcdone_data);
mc13xxx_irq_ack(mc13xxx, MC13783_IRQ_ADCDONE);
@@ -701,7 +742,7 @@ static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx,
if (!cell.name)
return -ENOMEM;
- return mfd_add_devices(&mc13xxx->spidev->dev, -1, &cell, 1, NULL, 0);
+ return mfd_add_devices(mc13xxx->pdev, -1, &cell, 1, NULL, 0);
}
static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format)
@@ -709,11 +750,48 @@ static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format)
return mc13xxx_add_subdevice_pdata(mc13xxx, format, NULL, 0);
}
-static int mc13xxx_probe(struct spi_device *spi)
+static int mc13xxx_common_probe(struct mc13xxx* mc13xxx,
+ struct mc13xxx_platform_data* pdata)
+{
+ mc13xxx_unlock(mc13xxx);
+
+ if (!pdata)
+ return 0;
+
+ if (pdata->flags & MC13XXX_USE_ADC)
+ mc13xxx_add_subdevice(mc13xxx, "%s-adc");
+
+ if (pdata->flags & MC13XXX_USE_CODEC)
+ mc13xxx_add_subdevice(mc13xxx, "%s-codec");
+
+ if (pdata->flags & MC13XXX_USE_REGULATOR) {
+ struct mc13xxx_regulator_platform_data regulator_pdata = {
+ .num_regulators = pdata->num_regulators,
+ .regulators = pdata->regulators,
+ };
+
+ mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
+ ®ulator_pdata, sizeof(regulator_pdata));
+ }
+
+ if (pdata->flags & MC13XXX_USE_RTC)
+ mc13xxx_add_subdevice(mc13xxx, "%s-rtc");
+
+ if (pdata->flags & MC13XXX_USE_TOUCHSCREEN)
+ mc13xxx_add_subdevice(mc13xxx, "%s-ts");
+
+ if (pdata->flags & MC13XXX_USE_LED) {
+ mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
+ pdata->leds, sizeof(*pdata->leds));
+ }
+
+ return 0;
+}
+
+static int mc13xxx_spi_probe(struct spi_device *spi)
{
struct mc13xxx *mc13xxx;
struct mc13xxx_platform_data *pdata = dev_get_platdata(&spi->dev);
- enum mc13xxx_id id;
int ret;
mc13xxx = kzalloc(sizeof(*mc13xxx), GFP_KERNEL);
@@ -725,13 +803,17 @@ static int mc13xxx_probe(struct spi_device *spi)
spi->bits_per_word = 32;
spi_setup(spi);
+ mc13xxx->pdev = &spi->dev;
mc13xxx->spidev = spi;
+ mc13xxx->read_dev = mc13xxx_spi_reg_read;
+ mc13xxx->write_dev = mc13xxx_spi_reg_write;
+ mc13xxx->irq = spi->irq;
mutex_init(&mc13xxx->lock);
mc13xxx_lock(mc13xxx);
- ret = mc13xxx_identify(mc13xxx, &id);
- if (ret || id == MC13XXX_ID_INVALID)
+ ret = mc13xxx_identify(mc13xxx, 1);
+ if (ret || (mc13xxx->icid == MC13XXX_ID_INVALID))
goto err_revision;
/* mask all irqs */
@@ -743,7 +825,7 @@ static int mc13xxx_probe(struct spi_device *spi)
if (ret)
goto err_mask;
- ret = request_threaded_irq(spi->irq, NULL, mc13xxx_irq_thread,
+ ret = request_threaded_irq(mc13xxx->irq, NULL, mc13xxx_irq_thread,
IRQF_ONESHOT | IRQF_TRIGGER_HIGH, "mc13xxx", mc13xxx);
if (ret) {
@@ -755,43 +837,15 @@ err_revision:
return ret;
}
- mc13xxx_unlock(mc13xxx);
-
- if (pdata->flags & MC13XXX_USE_ADC)
- mc13xxx_add_subdevice(mc13xxx, "%s-adc");
-
- if (pdata->flags & MC13XXX_USE_CODEC)
- mc13xxx_add_subdevice(mc13xxx, "%s-codec");
-
- if (pdata->flags & MC13XXX_USE_REGULATOR) {
- struct mc13xxx_regulator_platform_data regulator_pdata = {
- .num_regulators = pdata->num_regulators,
- .regulators = pdata->regulators,
- };
-
- mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
- ®ulator_pdata, sizeof(regulator_pdata));
- }
-
- if (pdata->flags & MC13XXX_USE_RTC)
- mc13xxx_add_subdevice(mc13xxx, "%s-rtc");
-
- if (pdata->flags & MC13XXX_USE_TOUCHSCREEN)
- mc13xxx_add_subdevice(mc13xxx, "%s-ts");
-
- if (pdata->flags & MC13XXX_USE_LED) {
- mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
- pdata->leds, sizeof(*pdata->leds));
- }
-
- return 0;
+ return mc13xxx_common_probe(mc13xxx, pdata);
}
-static int __devexit mc13xxx_remove(struct spi_device *spi)
+
+static int __devexit mc13xxx_spi_remove(struct spi_device *spi)
{
struct mc13xxx *mc13xxx = dev_get_drvdata(&spi->dev);
- free_irq(mc13xxx->spidev->irq, mc13xxx);
+ free_irq(mc13xxx->irq, mc13xxx);
mfd_remove_devices(&spi->dev);
@@ -819,18 +873,100 @@ static struct spi_driver mc13xxx_driver = {
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
- .probe = mc13xxx_probe,
- .remove = __devexit_p(mc13xxx_remove),
+ .probe = mc13xxx_spi_probe,
+ .remove = __devexit_p(mc13xxx_spi_remove),
+};
+
+static int mc13xxx_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id* id)
+{
+ struct mc13xxx *mc13xxx;
+ struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
+ int ret;
+
+ mc13xxx = kzalloc(sizeof(*mc13xxx), GFP_KERNEL);
+ if (!mc13xxx)
+ return -ENOMEM;
+
+ dev_set_drvdata(&client->dev, mc13xxx);
+ mc13xxx->pdev = &client->dev;
+ mc13xxx->client = client;
+ mc13xxx->read_dev = mc13xxx_i2c_reg_read;
+ mc13xxx->write_dev = mc13xxx_i2c_reg_write;
+ mc13xxx->irq = client->irq;
+
+ mutex_init(&mc13xxx->lock);
+ mc13xxx_lock(mc13xxx);
+
+ ret = mc13xxx_identify(mc13xxx, 0);
+ if (ret || (mc13xxx->icid == MC13XXX_ID_INVALID))
+ goto err_revision;
+
+ /* mask all irqs */
+ ret = mc13xxx_reg_write(mc13xxx, MC13XXX_IRQMASK0, 0x00ffffff);
+ if (ret)
+ goto err_mask;
+
+ ret = mc13xxx_reg_write(mc13xxx, MC13XXX_IRQMASK1, 0x00ffffff);
+ if (ret)
+ goto err_mask;
+
+ ret = request_threaded_irq(mc13xxx->irq, NULL, mc13xxx_irq_thread,
+ IRQF_ONESHOT | IRQF_TRIGGER_HIGH, "mc13xxx", mc13xxx);
+
+ if (ret) {
+err_mask:
+err_revision:
+ mutex_unlock(&mc13xxx->lock);
+ kfree(mc13xxx);
+ return ret;
+ }
+
+ return mc13xxx_common_probe(mc13xxx,pdata);
+}
+
+static int __devexit mc13xxx_i2c_remove(struct i2c_client *client)
+{
+ struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);
+
+ free_irq(mc13xxx->irq, mc13xxx);
+
+ mfd_remove_devices(&client->dev);
+
+ kfree(mc13xxx);
+
+ return 0;
+}
+
+static const struct i2c_device_id mc13xxx_i2c_idtable[] = {
+ { "mc13892", MC13XXX_ID_MC13892},
+ { }
+};
+
+static struct i2c_driver mc13xxx_i2c_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "mc13xxx-i2c"
+ },
+ .id_table = mc13xxx_i2c_idtable,
+ .probe = mc13xxx_i2c_probe,
+ .remove = __devexit_p(mc13xxx_i2c_remove),
};
static int __init mc13xxx_init(void)
{
- return spi_register_driver(&mc13xxx_driver);
+ int i2cret;
+ int spiret;
+ i2cret = i2c_add_driver(&mc13xxx_i2c_driver);
+ spiret = spi_register_driver(&mc13xxx_driver);
+
+ return (i2cret == 0) && (spiret == 0);
}
subsys_initcall(mc13xxx_init);
static void __exit mc13xxx_exit(void)
{
+ i2c_del_driver(&mc13xxx_i2c_driver);
spi_unregister_driver(&mc13xxx_driver);
}
module_exit(mc13xxx_exit);
--
1.7.1
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