Commit a2ef2a8e authored by David Brownell's avatar David Brownell Committed by Kevin Hilman

ARM: DaVinci: support two gpio expanders

Declare two of the three I2C GPIO expanders to the EVM board init logic, and
use them.  One hooks up to the LEDs using the leds-gpio driver; the other
exposes a switch to sysfs, and initializes the audio clocks.

The third expander is currently handled by gpio_expander_davinci.c (which
has not yet gone upstream, and probably can't), so a patch to handle that
expander should remove that file and its users.
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarKevin Hilman <khilman@mvista.com>
parent dbf4cf92
...@@ -13,6 +13,11 @@ ...@@ -13,6 +13,11 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/dma-mapping.h> #include <linux/dma-mapping.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/i2c/pcf857x.h>
#include <linux/leds.h>
#include <linux/mtd/mtd.h> #include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h> #include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h> #include <linux/mtd/partitions.h>
...@@ -221,6 +226,189 @@ static struct platform_device ide_dev = { ...@@ -221,6 +226,189 @@ static struct platform_device ide_dev = {
.num_resources = ARRAY_SIZE(ide_resources), .num_resources = ARRAY_SIZE(ide_resources),
}; };
/*----------------------------------------------------------------------*/
/*
* I2C GPIO expanders
*/
#define PCF_Uxx_BASE(x) (DAVINCI_N_GPIO + ((x) * 8))
/* U2 -- LEDs */
static struct gpio_led evm_leds[] = {
{ .name = "DS8", .active_low = 1,
.default_trigger = "heartbeat", },
{ .name = "DS7", .active_low = 1, },
{ .name = "DS6", .active_low = 1, },
{ .name = "DS5", .active_low = 1, },
{ .name = "DS4", .active_low = 1, },
{ .name = "DS3", .active_low = 1, },
{ .name = "DS2", .active_low = 1,
.default_trigger = "mmc0", },
{ .name = "DS1", .active_low = 1,
.default_trigger = "ide-disk", },
};
static const struct gpio_led_platform_data evm_led_data = {
.num_leds = ARRAY_SIZE(evm_leds),
.leds = evm_leds,
};
static struct platform_device *evm_led_dev;
static int
evm_led_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
struct gpio_led *leds = evm_leds;
int status;
while (ngpio--) {
leds->gpio = gpio++;
leds++;
}
/* what an extremely annoying way to be forced to handle
* device unregistration ...
*/
evm_led_dev = platform_device_alloc("leds-gpio", 0);
platform_device_add_data(evm_led_dev,
&evm_led_data, sizeof evm_led_data);
evm_led_dev->dev.parent = &client->dev;
status = platform_device_add(evm_led_dev);
if (status < 0) {
platform_device_put(evm_led_dev);
evm_led_dev = NULL;
}
return status;
}
static int
evm_led_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
if (evm_led_dev) {
platform_device_unregister(evm_led_dev);
evm_led_dev = NULL;
}
return 0;
}
static struct pcf857x_platform_data pcf_data_u2 = {
.gpio_base = PCF_Uxx_BASE(0),
.setup = evm_led_setup,
.teardown = evm_led_teardown,
};
/* U18 - A/V clock generator and user switch */
static int sw_gpio;
static ssize_t
sw_show(struct device *d, struct device_attribute *a, char *buf)
{
char *s = gpio_get_value_cansleep(sw_gpio) ? "on\n" : "off\n";
strcpy(buf, s);
return strlen(s);
}
static DEVICE_ATTR(user_sw, S_IRUGO, sw_show, NULL);
static int
evm_u18_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
int status;
/* export dip switch option */
sw_gpio = gpio + 7;
status = gpio_request(sw_gpio, "user_sw");
if (status == 0)
status = gpio_direction_input(sw_gpio);
if (status == 0)
status = device_create_file(&client->dev, &dev_attr_user_sw);
else
gpio_free(sw_gpio);
if (status != 0)
sw_gpio = -EINVAL;
/* audio PLL: 48 kHz (vs 44.1 or 32), single rate (vs double) */
gpio_request(gpio + 3, "pll_fs2");
gpio_direction_output(gpio + 3, 0);
gpio_request(gpio + 2, "pll_fs1");
gpio_direction_output(gpio + 2, 0);
gpio_request(gpio + 1, "pll_sr");
gpio_direction_output(gpio + 1, 0);
return 0;
}
static int
evm_u18_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
gpio_free(gpio + 1);
gpio_free(gpio + 2);
gpio_free(gpio + 3);
if (sw_gpio > 0) {
device_remove_file(&client->dev, &dev_attr_user_sw);
gpio_free(sw_gpio);
}
return 0;
}
static struct pcf857x_platform_data pcf_data_u18 = {
.gpio_base = PCF_Uxx_BASE(1),
.n_latch = (1 << 3) | (1 << 2) | (1 << 1),
.setup = evm_u18_setup,
.teardown = evm_u18_teardown,
};
/* U35 - various I/O signals used to manage USB, CF, ATA, etc */
#if 0
static struct pcf857x_platform_data pcf_data_u35 = {
.gpio_base = PCF_Uxx_BASE(2),
};
#endif
/*----------------------------------------------------------------------*/
static struct i2c_board_info __initdata i2c_info[] = {
{
I2C_BOARD_INFO("pcf857x", 0x38),
.type = "pcf8574",
.platform_data = &pcf_data_u2,
},
{
I2C_BOARD_INFO("pcf857x", 0x39),
.type = "pcf8574",
.platform_data = &pcf_data_u18,
},
#if 0
/* don't clash with mach-davinci/i2c-client.c
* or drivers/i2c/chips/gpio_expander_davinci.c
* ... eventually both should vanish
*/
{
I2C_BOARD_INFO("pcf857x", 0x3a),
.type = "pcf8574a",
.platform_data = &pcf_data_u35,
},
#endif
/* ALSO:
* - tvl320aic33 audio codec (0x1b)
* - msp430 microcontroller (0x23)
* - 24wc256 eeprom (0x50)
* - tvp5146 video decoder (0x5d)
*/
};
static struct platform_device *davinci_evm_devices[] __initdata = { static struct platform_device *davinci_evm_devices[] __initdata = {
&davinci_evm_norflash_device, &davinci_evm_norflash_device,
#if defined(CONFIG_MTD_NAND_DAVINCI) || defined(CONFIG_MTD_NAND_DAVINCI_MODULE) #if defined(CONFIG_MTD_NAND_DAVINCI) || defined(CONFIG_MTD_NAND_DAVINCI_MODULE)
...@@ -254,7 +442,7 @@ static __init void davinci_evm_init(void) ...@@ -254,7 +442,7 @@ static __init void davinci_evm_init(void)
platform_add_devices(davinci_evm_devices, platform_add_devices(davinci_evm_devices,
ARRAY_SIZE(davinci_evm_devices)); ARRAY_SIZE(davinci_evm_devices));
i2c_register_board_info(1, i2c_info, ARRAY_SIZE(i2c_info));
setup_usb(); setup_usb();
} }
......
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