diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-i801.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-i801.c | 185 |
1 files changed, 184 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index 33e9b0c09af2..37793156bd93 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -80,6 +80,13 @@ #include <linux/dmi.h> #include <linux/slab.h> #include <linux/wait.h> +#include <linux/err.h> + +#if defined CONFIG_I2C_MUX || defined CONFIG_I2C_MUX_MODULE +#include <linux/gpio.h> +#include <linux/i2c-mux-gpio.h> +#include <linux/platform_device.h> +#endif /* I801 SMBus address offsets */ #define SMBHSTSTS(p) (0 + (p)->smba) @@ -158,6 +165,15 @@ #define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS 0x8c22 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS 0x9c22 +struct i801_mux_config { + char *gpio_chip; + unsigned values[3]; + int n_values; + unsigned classes[3]; + unsigned gpios[2]; /* Relative to gpio_chip->base */ + int n_gpios; +}; + struct i801_priv { struct i2c_adapter adapter; unsigned long smba; @@ -175,6 +191,11 @@ struct i801_priv { int count; int len; u8 *data; + +#if defined CONFIG_I2C_MUX || defined CONFIG_I2C_MUX_MODULE + const struct i801_mux_config *mux_drvdata; + struct platform_device *mux_pdev; +#endif }; static struct pci_driver i801_driver; @@ -900,6 +921,165 @@ static void __init input_apanel_init(void) {} static void __devinit i801_probe_optional_slaves(struct i801_priv *priv) {} #endif /* CONFIG_X86 && CONFIG_DMI */ +#if defined CONFIG_I2C_MUX || defined CONFIG_I2C_MUX_MODULE +static struct i801_mux_config i801_mux_config_asus_z8_d12 = { + .gpio_chip = "gpio_ich", + .values = { 0x02, 0x03 }, + .n_values = 2, + .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD }, + .gpios = { 52, 53 }, + .n_gpios = 2, +}; + +static struct i801_mux_config i801_mux_config_asus_z8_d18 = { + .gpio_chip = "gpio_ich", + .values = { 0x02, 0x03, 0x01 }, + .n_values = 3, + .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD, I2C_CLASS_SPD }, + .gpios = { 52, 53 }, + .n_gpios = 2, +}; + +static struct dmi_system_id __devinitdata mux_dmi_table[] = { + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8NA-D6(C)"), + }, + .driver_data = &i801_mux_config_asus_z8_d12, + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)E-D12(X)"), + }, + .driver_data = &i801_mux_config_asus_z8_d12, + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8NH-D12"), + }, + .driver_data = &i801_mux_config_asus_z8_d12, + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8PH-D12/IFB"), + }, + .driver_data = &i801_mux_config_asus_z8_d12, + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8NR-D12"), + }, + .driver_data = &i801_mux_config_asus_z8_d12, + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)H-D12"), + }, + .driver_data = &i801_mux_config_asus_z8_d12, + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8PG-D18"), + }, + .driver_data = &i801_mux_config_asus_z8_d18, + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8PE-D18"), + }, + .driver_data = &i801_mux_config_asus_z8_d18, + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "Z8PS-D12"), + }, + .driver_data = &i801_mux_config_asus_z8_d12, + }, + { } +}; + +/* Setup multiplexing if needed */ +static int __devinit i801_add_mux(struct i801_priv *priv) +{ + struct device *dev = &priv->adapter.dev; + const struct i801_mux_config *mux_config; + struct i2c_mux_gpio_platform_data gpio_data; + int err; + + if (!priv->mux_drvdata) + return 0; + mux_config = priv->mux_drvdata; + + /* Prepare the platform data */ + memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data)); + gpio_data.parent = priv->adapter.nr; + gpio_data.values = mux_config->values; + gpio_data.n_values = mux_config->n_values; + gpio_data.classes = mux_config->classes; + gpio_data.gpio_chip = mux_config->gpio_chip; + gpio_data.gpios = mux_config->gpios; + gpio_data.n_gpios = mux_config->n_gpios; + gpio_data.idle = I2C_MUX_GPIO_NO_IDLE; + + /* Register the mux device */ + priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio", + PLATFORM_DEVID_AUTO, &gpio_data, + sizeof(struct i2c_mux_gpio_platform_data)); + if (IS_ERR(priv->mux_pdev)) { + err = PTR_ERR(priv->mux_pdev); + priv->mux_pdev = NULL; + dev_err(dev, "Failed to register i2c-mux-gpio device\n"); + return err; + } + + return 0; +} + +static void __devexit i801_del_mux(struct i801_priv *priv) +{ + if (priv->mux_pdev) + platform_device_unregister(priv->mux_pdev); +} + +static unsigned int __devinit i801_get_adapter_class(struct i801_priv *priv) +{ + const struct dmi_system_id *id; + const struct i801_mux_config *mux_config; + unsigned int class = I2C_CLASS_HWMON | I2C_CLASS_SPD; + int i; + + id = dmi_first_match(mux_dmi_table); + if (id) { + /* Remove from branch classes from trunk */ + mux_config = id->driver_data; + for (i = 0; i < mux_config->n_values; i++) + class &= ~mux_config->classes[i]; + + /* Remember for later */ + priv->mux_drvdata = mux_config; + } + + return class; +} +#else +static inline int i801_add_mux(struct i801_priv *priv) { return 0; } +static inline void i801_del_mux(struct i801_priv *priv) { } + +static inline unsigned int i801_get_adapter_class(struct i801_priv *priv) +{ + return I2C_CLASS_HWMON | I2C_CLASS_SPD; +} +#endif + static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id *id) { @@ -913,7 +1093,7 @@ static int __devinit i801_probe(struct pci_dev *dev, i2c_set_adapdata(&priv->adapter, priv); priv->adapter.owner = THIS_MODULE; - priv->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; + priv->adapter.class = i801_get_adapter_class(priv); priv->adapter.algo = &smbus_algorithm; priv->pci_dev = dev; @@ -1033,6 +1213,8 @@ static int __devinit i801_probe(struct pci_dev *dev, } i801_probe_optional_slaves(priv); + /* We ignore errors - multiplexing is optional */ + i801_add_mux(priv); pci_set_drvdata(dev, priv); @@ -1052,6 +1234,7 @@ static void __devexit i801_remove(struct pci_dev *dev) { struct i801_priv *priv = pci_get_drvdata(dev); + i801_del_mux(priv); i2c_del_adapter(&priv->adapter); pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg); |