Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-25 20:32:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

platform/x86: serial-multi-instantiate: Reorganize I2C functions

Browse Source 
Reorganize I2C functions to accommodate SPI support
Split the probe and factor out parts of the code
that will be used in the SPI support
Also switched from strlcpy() to strscpy()

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220121172431.6876-7-sbinding@opensource.cirrus.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Lucas Tanure 2022-01-21 17:24:28 +00:00 committed by Hans de Goede
parent 5e63b2ea3d
commit 35a36cbb7b
1 changed files with 90 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

144
drivers/platform/x86/serial-multi-instantiate.c
View File

@ -29,96 +29,132 @@ struct smi_instance {
struct smi {
int i2c_num;
struct i2c_client *i2c_devs[];
struct i2c_client **i2c_devs;
};
static int smi_probe(struct platform_device *pdev)
static int smi_get_irq(struct platform_device *pdev, struct acpi_device *adev,
const struct smi_instance *inst)
{
struct i2c_board_info board_info = {};
const struct smi_instance *inst;
struct device *dev = &pdev->dev;
struct acpi_device *adev;
struct smi *smi;
char name[32];
int i, ret;
int ret;
inst = device_get_match_data(dev);
if (!inst) {
dev_err(dev, "Error ACPI match data is missing\n");
return -ENODEV;
switch (inst->flags & IRQ_RESOURCE_TYPE) {
case IRQ_RESOURCE_GPIO:
ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx);
break;
case IRQ_RESOURCE_APIC:
ret = platform_get_irq(pdev, inst->irq_idx);
break;
default:
return 0;
}
adev = ACPI_COMPANION(dev);
if (ret < 0)
dev_err_probe(&pdev->dev, ret, "Error requesting irq at index %d: %d\n",
inst->irq_idx, ret);
return ret;
}
static void smi_devs_unregister(struct smi *smi)
{
while (smi->i2c_num > 0)
i2c_unregister_device(smi->i2c_devs[--smi->i2c_num]);
}
/**
* smi_i2c_probe - Instantiate multiple I2C devices from inst array
* @pdev: Platform device
* @adev: ACPI device
* @smi: Internal struct for Serial multi instantiate driver
* @inst_array: Array of instances to probe
*
* Returns the number of I2C devices instantiate, Zero if none is found or a negative error code.
*/
static int smi_i2c_probe(struct platform_device *pdev, struct acpi_device *adev, struct smi *smi,
const struct smi_instance *inst_array)
{
struct i2c_board_info board_info = {};
struct device *dev = &pdev->dev;
char name[32];
int i, ret, count;
/* Count number of clients to instantiate */
ret = i2c_acpi_client_count(adev);
if (ret < 0)
return ret;
else if (!ret)
return -ENODEV;
smi = devm_kmalloc(dev, struct_size(smi, i2c_devs, ret), GFP_KERNEL);
if (!smi)
count = ret;
smi->i2c_devs = devm_kcalloc(dev, count, sizeof(*smi->i2c_devs), GFP_KERNEL);
if (!smi->i2c_devs)
return -ENOMEM;
smi->i2c_num = ret;
for (i = 0; i < smi->i2c_num && inst[i].type; i++) {
for (i = 0; i < count && inst_array[i].type; i++) {
memset(&board_info, 0, sizeof(board_info));
strlcpy(board_info.type, inst[i].type, I2C_NAME_SIZE);
snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst[i].type, i);
strscpy(board_info.type, inst_array[i].type, I2C_NAME_SIZE);
snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst_array[i].type, i);
board_info.dev_name = name;
switch (inst[i].flags & IRQ_RESOURCE_TYPE) {
case IRQ_RESOURCE_GPIO:
ret = acpi_dev_gpio_irq_get(adev, inst[i].irq_idx);
if (ret < 0) {
dev_err(dev, "Error requesting irq at index %d: %d\n",
inst[i].irq_idx, ret);
goto error;
}
board_info.irq = ret;
break;
case IRQ_RESOURCE_APIC:
ret = platform_get_irq(pdev, inst[i].irq_idx);
if (ret < 0) {
dev_dbg(dev, "Error requesting irq at index %d: %d\n",
inst[i].irq_idx, ret);
goto error;
}
board_info.irq = ret;
break;
default:
board_info.irq = 0;
break;
}
ret = smi_get_irq(pdev, adev, &inst_array[i]);
if (ret < 0)
goto error;
board_info.irq = ret;
smi->i2c_devs[i] = i2c_acpi_new_device(dev, i, &board_info);
if (IS_ERR(smi->i2c_devs[i])) {
ret = dev_err_probe(dev, PTR_ERR(smi->i2c_devs[i]),
"Error creating i2c-client, idx %d\n", i);
goto error;
}
smi->i2c_num++;
}
if (i < smi->i2c_num) {
dev_err(dev, "Error finding driver, idx %d\n", i);
if (smi->i2c_num < count) {
dev_dbg(dev, "Error finding driver, idx %d\n", i);
ret = -ENODEV;
goto error;
}
platform_set_drvdata(pdev, smi);
return 0;
dev_info(dev, "Instantiated %d I2C devices.\n", smi->i2c_num);
return 0;
error:
while (--i >= 0)
i2c_unregister_device(smi->i2c_devs[i]);
smi_devs_unregister(smi);
return ret;
}
static int smi_probe(struct platform_device *pdev)
{
const struct smi_instance *inst_array;
struct device *dev = &pdev->dev;
struct acpi_device *adev;
struct smi *smi;
adev = ACPI_COMPANION(dev);
if (!adev)
return -ENODEV;
inst_array = device_get_match_data(dev);
if (!inst_array) {
dev_dbg(dev, "Error ACPI match data is missing\n");
return -ENODEV;
}
smi = devm_kzalloc(dev, sizeof(*smi), GFP_KERNEL);
if (!smi)
return -ENOMEM;
platform_set_drvdata(pdev, smi);
return smi_i2c_probe(pdev, adev, smi, inst_array);
}
static int smi_remove(struct platform_device *pdev)
{
struct smi *smi = platform_get_drvdata(pdev);
int i;
for (i = 0; i < smi->i2c_num; i++)
i2c_unregister_device(smi->i2c_devs[i]);
smi_devs_unregister(smi);
return 0;
}