Add a driver for the MAX1600 PCMCIA power switch device. This is a dual-channel device, controlled via four GPIO signals per channel. Two signals control the Vcc output, and two control the Vpp output.
Signed-off-by: Russell King <[email protected]> --- drivers/pcmcia/Kconfig | 3 ++ drivers/pcmcia/Makefile | 1 + drivers/pcmcia/max1600.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/pcmcia/max1600.h | 31 ++++++++++++ 4 files changed, 154 insertions(+) create mode 100644 drivers/pcmcia/max1600.c create mode 100644 drivers/pcmcia/max1600.h diff --git a/drivers/pcmcia/Kconfig b/drivers/pcmcia/Kconfig index d3c378b4db6c..8ac7f9f270c8 100644 --- a/drivers/pcmcia/Kconfig +++ b/drivers/pcmcia/Kconfig @@ -63,6 +63,9 @@ config CARDBUS If unsure, say Y. +config PCMCIA_MAX1600 + tristate + comment "PC-card bridges" config YENTA diff --git a/drivers/pcmcia/Makefile b/drivers/pcmcia/Makefile index 27e94b30cf96..56880f354361 100644 --- a/drivers/pcmcia/Makefile +++ b/drivers/pcmcia/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_BFIN_CFPCMCIA) += bfin_cf_pcmcia.o obj-$(CONFIG_AT91_CF) += at91_cf.o obj-$(CONFIG_ELECTRA_CF) += electra_cf.o obj-$(CONFIG_PCMCIA_ALCHEMY_DEVBOARD) += db1xxx_ss.o +obj-$(CONFIG_PCMCIA_MAX1600) += max1600.o sa1111_cs-y += sa1111_generic.o sa1111_cs-$(CONFIG_ASSABET_NEPONSET) += sa1111_neponset.o diff --git a/drivers/pcmcia/max1600.c b/drivers/pcmcia/max1600.c new file mode 100644 index 000000000000..476627a29baa --- /dev/null +++ b/drivers/pcmcia/max1600.c @@ -0,0 +1,119 @@ +/* + * MAX1600 PCMCIA power switch driver + * + * Copyright (C) 2016 Russell King + */ +#include <linux/device.h> +#include <linux/export.h> +#include <linux/gpio/consumer.h> +#include <linux/slab.h> +#include "max1600.h" + +static const char *max1600_gpio_name[2][MAX1600_GPIO_MAX] = { + { "a0vcc", "a1vcc", "a0vpp", "a1vpp" }, + { "b0vcc", "b1vcc", "b0vpp", "b1vpp" }, +}; + +int max1600_init(struct device *dev, struct max1600 **ptr, + unsigned int channel, unsigned int code) +{ + struct max1600 *m; + int chan; + int i; + + switch (channel) { + case MAX1600_CHAN_A: + chan = 0; + break; + case MAX1600_CHAN_B: + chan = 1; + break; + default: + return -EINVAL; + } + + if (code != MAX1600_CODE_LOW && code != MAX1600_CODE_HIGH) + return -EINVAL; + + m = devm_kzalloc(dev, sizeof(*m), GFP_KERNEL); + if (!m) + return -ENOMEM; + + m->dev = dev; + m->code = code; + + for (i = 0; i < MAX1600_GPIO_MAX; i++) { + const char *name; + + name = max1600_gpio_name[chan][i]; + if (i != MAX1600_GPIO_0VPP) { + m->gpio[i] = gpiod_get(dev, name, GPIOD_OUT_LOW); + } else { + m->gpio[i] = gpiod_get_optional(dev, name, GPIOD_OUT_LOW); + if (!m->gpio[i]) + break; + } + if (IS_ERR(m->gpio[i])) + return PTR_ERR(m->gpio[i]); + } + + *ptr = m; + + return 0; +} +EXPORT_SYMBOL_GPL(max1600_init); + +int max1600_configure(struct max1600 *m, unsigned int vcc, unsigned int vpp) +{ + int values[MAX1600_GPIO_MAX], n = MAX1600_GPIO_0VPP; + + if (m->gpio[MAX1600_GPIO_0VPP]) { + if (vpp == 0) { + values[MAX1600_GPIO_0VPP] = 0; + values[MAX1600_GPIO_1VPP] = 0; + } else if (vpp == 120) { + values[MAX1600_GPIO_0VPP] = 0; + values[MAX1600_GPIO_1VPP] = 1; + } else if (vpp == vcc) { + values[MAX1600_GPIO_0VPP] = 1; + values[MAX1600_GPIO_1VPP] = 0; + } else { + dev_err(m->dev, "unrecognised Vpp %u.%uV\n", + vpp / 10, vpp % 10); + return -EINVAL; + } + n = MAX1600_GPIO_MAX; + } else if (vpp != vcc && vpp != 0) { + dev_err(m->dev, "no VPP control\n"); + return -EINVAL; + } + + if (vcc == 0) { + values[MAX1600_GPIO_0VCC] = 0; + values[MAX1600_GPIO_1VCC] = 0; + } else if (vcc == 33) { /* VY */ + values[MAX1600_GPIO_0VCC] = 1; + values[MAX1600_GPIO_1VCC] = 0; + } else if (vcc == 50) { /* VX */ + values[MAX1600_GPIO_0VCC] = 0; + values[MAX1600_GPIO_1VCC] = 1; + } else { + dev_err(m->dev, "unrecognised Vcc %u.%uV\n", + vcc / 10, vcc % 10); + return -EINVAL; + } + + if (m->code == MAX1600_CODE_HIGH) { + /* + * Cirrus mode appears to be the same as Intel mode, + * except the VCC pins are inverted. + */ + values[MAX1600_GPIO_0VCC] = !values[MAX1600_GPIO_0VCC]; + values[MAX1600_GPIO_1VCC] = !values[MAX1600_GPIO_1VCC]; + } + + gpiod_set_array_value_cansleep(n, m->gpio, values); + + return 0; +} +EXPORT_SYMBOL_GPL(max1600_configure); diff --git a/drivers/pcmcia/max1600.h b/drivers/pcmcia/max1600.h new file mode 100644 index 000000000000..a674ddb5784b --- /dev/null +++ b/drivers/pcmcia/max1600.h @@ -0,0 +1,31 @@ +#ifndef MAX1600_H +#define MAX1600_H + +struct gpio_desc; + +enum { + MAX1600_GPIO_0VCC = 0, + MAX1600_GPIO_1VCC, + MAX1600_GPIO_0VPP, + MAX1600_GPIO_1VPP, + MAX1600_GPIO_MAX, + + MAX1600_CHAN_A, + MAX1600_CHAN_B, + + MAX1600_CODE_LOW, + MAX1600_CODE_HIGH, +}; + +struct max1600 { + struct gpio_desc *gpio[MAX1600_GPIO_MAX]; + struct device *dev; + unsigned int code; +}; + +int max1600_init(struct device *dev, struct max1600 **ptr, + unsigned int channel, unsigned int code); + +int max1600_configure(struct max1600 *, unsigned int vcc, unsigned int vpp); + +#endif -- 2.1.0 _______________________________________________ Linux PCMCIA reimplementation list http://lists.infradead.org/mailman/listinfo/linux-pcmcia
