| Message ID | 1455010021-21927-10-git-send-email-christophe-h.ricard@st.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, Feb 09, 2016 at 10:26:58AM +0100, Christophe Ricard wrote: > Add support for acpi probing. SMO3324 is used for st33zp24. > It has been tested with the following acpi node on Minnowboard: > > Device (TPM1) > { > Name (_ADR, Zero) // _ADR: Address > Name (_HID, "SMO3324") // _HID: Hardware ID > Name (_CID, "SMO3324") // _CID: Compatible ID > Name (_DDN, "SMO TPM") // _DDN: DOS Device Name > Name (_UID, One) // _UID: Unique ID > Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings > { > Name (SBUF, ResourceTemplate () > { > I2cSerialBus (0x0013, ControllerInitiated, 400000, > AddressingMode7Bit, "\\_SB.I2C7", > 0x00, ResourceConsumer, ,) > GpioInt (Edge, ActiveHigh, ExclusiveAndWake, PullNone, 0x0000, > "\\_SB.GPO2", 0x00, ResourceConsumer, ,) > { // Pin list > 0x0001 > } > GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly, > "\\_SB.GPO2", 0x00, ResourceConsumer, ,) > { // Pin list > 0x0002, > } > }) > Return (SBUF) /* \_SB_.I2C7.TPM1._CRS.SBUF */ > } > > Method (_STA, 0, NotSerialized) // _STA: Status > { > Return (0x0F) > } > } > > Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> /Jarkko > --- > drivers/char/tpm/st33zp24/i2c.c | 50 +++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 50 insertions(+) > > diff --git a/drivers/char/tpm/st33zp24/i2c.c b/drivers/char/tpm/st33zp24/i2c.c > index a49b6f1..b20cc2b 100644 > --- a/drivers/char/tpm/st33zp24/i2c.c > +++ b/drivers/char/tpm/st33zp24/i2c.c > @@ -19,8 +19,10 @@ > #include <linux/module.h> > #include <linux/i2c.h> > #include <linux/gpio.h> > +#include <linux/gpio/consumer.h> > #include <linux/of_irq.h> > #include <linux/of_gpio.h> > +#include <linux/acpi.h> > #include <linux/tpm.h> > #include <linux/platform_data/st33zp24.h> > > @@ -108,6 +110,43 @@ static const struct st33zp24_phy_ops i2c_phy_ops = { > .recv = st33zp24_i2c_recv, > }; > > +static int st33zp24_i2c_acpi_request_resources(struct st33zp24_i2c_phy *phy) > +{ > + struct i2c_client *client = phy->client; > + const struct acpi_device_id *id; > + struct gpio_desc *gpiod_lpcpd; > + struct device *dev; > + > + if (!client) > + return -EINVAL; > + > + dev = &client->dev; > + > + /* Match the struct device against a given list of ACPI IDs */ > + id = acpi_match_device(dev->driver->acpi_match_table, dev); > + if (!id) > + return -ENODEV; > + > + /* Get LPCPD GPIO from ACPI */ > + gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1, > + GPIOD_OUT_HIGH); > + if (IS_ERR(gpiod_lpcpd)) { > + dev_err(&client->dev, > + "Failed to retrieve lpcpd-gpios from acpi.\n"); > + phy->io_lpcpd = -1; > + /* > + * lpcpd pin is not specified. This is not an issue as > + * power management can be also managed by TPM specific > + * commands. So leave with a success status code. > + */ > + return 0; > + } > + > + phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd); > + > + return 0; > +} > + > static int st33zp24_i2c_of_request_resources(struct st33zp24_i2c_phy *phy) > { > struct device_node *pp; > @@ -214,6 +253,10 @@ static int st33zp24_i2c_probe(struct i2c_client *client, > ret = st33zp24_i2c_request_resources(client, phy); > if (ret) > return ret; > + } else if (ACPI_HANDLE(&client->dev)) { > + ret = st33zp24_i2c_acpi_request_resources(phy); > + if (ret) > + return ret; > } > > return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq, > @@ -244,6 +287,12 @@ static const struct of_device_id of_st33zp24_i2c_match[] = { > }; > MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match); > > +static const struct acpi_device_id st33zp24_i2c_acpi_match[] = { > + {"SMO3324"}, > + {} > +}; > +MODULE_DEVICE_TABLE(acpi, st33zp24_i2c_acpi_match); > + > static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend, > st33zp24_pm_resume); > > @@ -252,6 +301,7 @@ static struct i2c_driver st33zp24_i2c_driver = { > .name = TPM_ST33_I2C, > .pm = &st33zp24_i2c_ops, > .of_match_table = of_match_ptr(of_st33zp24_i2c_match), > + .acpi_match_table = ACPI_PTR(st33zp24_i2c_acpi_match), > }, > .probe = st33zp24_i2c_probe, > .remove = st33zp24_i2c_remove, > -- > 2.5.0 > ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140
diff --git a/drivers/char/tpm/st33zp24/i2c.c b/drivers/char/tpm/st33zp24/i2c.c index a49b6f1..b20cc2b 100644 --- a/drivers/char/tpm/st33zp24/i2c.c +++ b/drivers/char/tpm/st33zp24/i2c.c @@ -19,8 +19,10 @@ #include <linux/module.h> #include <linux/i2c.h> #include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/of_irq.h> #include <linux/of_gpio.h> +#include <linux/acpi.h> #include <linux/tpm.h> #include <linux/platform_data/st33zp24.h> @@ -108,6 +110,43 @@ static const struct st33zp24_phy_ops i2c_phy_ops = { .recv = st33zp24_i2c_recv, }; +static int st33zp24_i2c_acpi_request_resources(struct st33zp24_i2c_phy *phy) +{ + struct i2c_client *client = phy->client; + const struct acpi_device_id *id; + struct gpio_desc *gpiod_lpcpd; + struct device *dev; + + if (!client) + return -EINVAL; + + dev = &client->dev; + + /* Match the struct device against a given list of ACPI IDs */ + id = acpi_match_device(dev->driver->acpi_match_table, dev); + if (!id) + return -ENODEV; + + /* Get LPCPD GPIO from ACPI */ + gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1, + GPIOD_OUT_HIGH); + if (IS_ERR(gpiod_lpcpd)) { + dev_err(&client->dev, + "Failed to retrieve lpcpd-gpios from acpi.\n"); + phy->io_lpcpd = -1; + /* + * lpcpd pin is not specified. This is not an issue as + * power management can be also managed by TPM specific + * commands. So leave with a success status code. + */ + return 0; + } + + phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd); + + return 0; +} + static int st33zp24_i2c_of_request_resources(struct st33zp24_i2c_phy *phy) { struct device_node *pp; @@ -214,6 +253,10 @@ static int st33zp24_i2c_probe(struct i2c_client *client, ret = st33zp24_i2c_request_resources(client, phy); if (ret) return ret; + } else if (ACPI_HANDLE(&client->dev)) { + ret = st33zp24_i2c_acpi_request_resources(phy); + if (ret) + return ret; } return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq, @@ -244,6 +287,12 @@ static const struct of_device_id of_st33zp24_i2c_match[] = { }; MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match); +static const struct acpi_device_id st33zp24_i2c_acpi_match[] = { + {"SMO3324"}, + {} +}; +MODULE_DEVICE_TABLE(acpi, st33zp24_i2c_acpi_match); + static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend, st33zp24_pm_resume); @@ -252,6 +301,7 @@ static struct i2c_driver st33zp24_i2c_driver = { .name = TPM_ST33_I2C, .pm = &st33zp24_i2c_ops, .of_match_table = of_match_ptr(of_st33zp24_i2c_match), + .acpi_match_table = ACPI_PTR(st33zp24_i2c_acpi_match), }, .probe = st33zp24_i2c_probe, .remove = st33zp24_i2c_remove,
Add support for acpi probing. SMO3324 is used for st33zp24. It has been tested with the following acpi node on Minnowboard: Device (TPM1) { Name (_ADR, Zero) // _ADR: Address Name (_HID, "SMO3324") // _HID: Hardware ID Name (_CID, "SMO3324") // _CID: Compatible ID Name (_DDN, "SMO TPM") // _DDN: DOS Device Name Name (_UID, One) // _UID: Unique ID Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings { Name (SBUF, ResourceTemplate () { I2cSerialBus (0x0013, ControllerInitiated, 400000, AddressingMode7Bit, "\\_SB.I2C7", 0x00, ResourceConsumer, ,) GpioInt (Edge, ActiveHigh, ExclusiveAndWake, PullNone, 0x0000, "\\_SB.GPO2", 0x00, ResourceConsumer, ,) { // Pin list 0x0001 } GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly, "\\_SB.GPO2", 0x00, ResourceConsumer, ,) { // Pin list 0x0002, } }) Return (SBUF) /* \_SB_.I2C7.TPM1._CRS.SBUF */ } Method (_STA, 0, NotSerialized) // _STA: Status { Return (0x0F) } } Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> --- drivers/char/tpm/st33zp24/i2c.c | 50 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+)