[PATCH 18/33] pcmcia: sa1100: provide generic CF support

Russell King
2016-08-29T10:25:37Z

Provide generic non-voltage sensing socket support for StrongARM
platforms using the gpiolib and regulator subsystems to obtain the
resources to control the socket.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
drivers/pcmcia/sa1100_generic.c | 120 ++++++++++++++++++++++++++++++++++++++--
1 file changed, 115 insertions(+), 5 deletions(-)

diff --git a/drivers/pcmcia/sa1100_generic.c b/drivers/pcmcia/sa1100_generic.c
index 66acdc85727c..21ccf6360b3e 100644
--- a/drivers/pcmcia/sa1100_generic.c
+++ b/drivers/pcmcia/sa1100_generic.c
@@ -31,7 +31,9 @@
======================================================================*/

#include <linux/module.h>
+#include <linux/gpio/consumer.h>
#include <linux/init.h>
+#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/platform_device.h>

@@ -41,9 +43,78 @@

#include "sa1100_generic.h"

+static const char *gpio_name[] = {
+ [SOC_STAT_CD] = "detect",
+ [SOC_STAT_BVD1] = "bvd1",
+ [SOC_STAT_BVD2] = "bvd2",
+ [SOC_STAT_RDY] = "ready",
+};
+
+static int sa11x0_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+ struct device *dev = skt->socket.dev.parent;
+ int i;
+
+ skt->gpio_reset = gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(skt->gpio_reset))
+ return PTR_ERR(skt->gpio_reset);
+
+ skt->gpio_bus_enable = gpiod_get_optional(dev, "bus-enable",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(skt->gpio_bus_enable)) {
+ gpiod_put(skt->gpio_reset);
+ return PTR_ERR(skt->gpio_bus_enable);
+ }
+
+ skt->vcc.reg = regulator_get_optional(dev, "vcc");
+ if (IS_ERR(skt->vcc.reg)) {
+ if (skt->gpio_bus_enable)
+ gpiod_put(skt->gpio_bus_enable);
+ gpiod_put(skt->gpio_reset);
+ return PTR_ERR(skt->vcc.reg);
+ }
+
+ if (!skt->vcc.reg)
+ dev_warn(dev,
+ "no Vcc regulator provided, ignoring Vcc controls\n");
+
+ for (i = 0; i < ARRAY_SIZE(skt->stat); i++) {
+ skt->stat[i].name = gpio_name[i];
+ skt->stat[i].desc = gpiod_get_optional(dev, gpio_name[i],
+ GPIOD_IN);
+ if (IS_ERR(skt->stat[i].desc)) {
+ int err = PTR_ERR(skt->stat[i].desc);
+
+ while (--i >= 0) {
+ if (skt->stat[i].desc)
+ gpiod_put(skt->stat[i].desc);
+ }
+ if (skt->gpio_bus_enable)
+ gpiod_put(skt->gpio_bus_enable);
+ gpiod_put(skt->gpio_reset);
+
+ return err;
+ }
+ }
+ return 0;
+}
+
+static int sa11x0_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
+ const socket_state_t *state)
+{
+ return soc_pcmcia_regulator_set(skt, &skt->vcc, state->Vcc);
+}
+
+static struct pcmcia_low_level sa11x0_ops = {
+ .owner = THIS_MODULE,
+ .hw_init = sa11x0_pcmcia_hw_init,
+ .socket_state = soc_common_cf_socket_state,
+ .configure_socket = sa11x0_pcmcia_configure_socket,
+};
+
int __init pcmcia_collie_init(struct device *dev);

-static int (*sa11x0_pcmcia_hw_init[])(struct device *dev) = {
+static int (*sa11x0_pcmcia_legacy_hw_init[])(struct device *dev) = {
#ifdef CONFIG_SA1100_ASSABET
pcmcia_assabet_init,
#endif
@@ -67,15 +138,15 @@ static int (*sa11x0_pcmcia_hw_init[])(struct device *dev) = {
#endif
};

-static int sa11x0_drv_pcmcia_probe(struct platform_device *dev)
+static int sa11x0_drv_pcmcia_legacy_probe(struct platform_device *dev)
{
int i, ret = -ENODEV;

/*
* Initialise any "on-board" PCMCIA sockets.
*/
- for (i = 0; i < ARRAY_SIZE(sa11x0_pcmcia_hw_init); i++) {
- ret = sa11x0_pcmcia_hw_init[i](&dev->dev);
+ for (i = 0; i < ARRAY_SIZE(sa11x0_pcmcia_legacy_hw_init); i++) {
+ ret = sa11x0_pcmcia_legacy_hw_init[i](&dev->dev);
if (ret == 0)
break;
}
@@ -83,7 +154,7 @@ static int sa11x0_drv_pcmcia_probe(struct platform_device *dev)
return ret;
}

-static int sa11x0_drv_pcmcia_remove(struct platform_device *dev)
+static int sa11x0_drv_pcmcia_legacy_remove(struct platform_device *dev)
{
struct skt_dev_info *sinfo = platform_get_drvdata(dev);
int i;
@@ -96,6 +167,45 @@ static int sa11x0_drv_pcmcia_remove(struct platform_device *dev)
return 0;
}

+static int sa11x0_drv_pcmcia_probe(struct platform_device *pdev)
+{
+ struct soc_pcmcia_socket *skt;
+ struct device *dev = &pdev->dev;
+
+ if (dev->id == -1)
+ return sa11x0_drv_pcmcia_legacy_probe(pdev);
+
+ skt = devm_kzalloc(dev, sizeof(*skt), GFP_KERNEL);
+ if (!skt)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, skt);
+
+ skt->nr = pdev->id;
+ skt->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(skt->clk))
+ return PTR_ERR(skt->clk);
+
+ sa11xx_drv_pcmcia_ops(&sa11x0_ops);
+ soc_pcmcia_init_one(skt, &sa11x0_ops, dev);
+
+ return sa11xx_drv_pcmcia_add_one(skt);
+}
+
+static int sa11x0_drv_pcmcia_remove(struct platform_device *dev)
+{
+ struct soc_pcmcia_socket *skt;
+
+ if (dev->id == -1)
+ return sa11x0_drv_pcmcia_legacy_remove(dev);
+
+ skt = platform_get_drvdata(dev);
+
+ soc_pcmcia_remove_one(skt);
+
+ return 0;
+}
+
static struct platform_driver sa11x0_pcmcia_driver = {
.driver = {
.name = "sa11x0-pcmcia",
--
2.1.0