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-rw-r--r--arch/arm/mach-s3c2410/mach-bast.c32
-rw-r--r--arch/arm/mach-s3c6410/Kconfig10
-rw-r--r--arch/arm/mach-s3c6410/Makefile3
-rw-r--r--arch/arm/mach-s3c6410/mach-hmt.c276
-rw-r--r--arch/arm/plat-s3c/include/plat/adc.h8
-rw-r--r--arch/arm/plat-s3c/include/plat/devs.h2
-rw-r--r--arch/arm/plat-s3c/include/plat/hwmon.h41
-rw-r--r--arch/arm/plat-s3c24xx/adc.c64
-rw-r--r--arch/arm/plat-s3c24xx/devs.c2
-rw-r--r--drivers/hwmon/Kconfig17
-rw-r--r--drivers/hwmon/Makefile1
-rw-r--r--drivers/hwmon/s3c-hwmon.c405
12 files changed, 845 insertions, 16 deletions
diff --git a/arch/arm/mach-s3c2410/mach-bast.c b/arch/arm/mach-s3c2410/mach-bast.c
index ce3baba2cd7f..06670bb89cab 100644
--- a/arch/arm/mach-s3c2410/mach-bast.c
+++ b/arch/arm/mach-s3c2410/mach-bast.c
@@ -45,6 +45,7 @@
#include <mach/regs-mem.h>
#include <mach/regs-lcd.h>
+#include <plat/hwmon.h>
#include <plat/nand.h>
#include <plat/iic.h>
#include <mach/fb.h>
@@ -547,7 +548,35 @@ static struct i2c_board_info bast_i2c_devs[] __initdata = {
},
};
+static struct s3c_hwmon_pdata bast_hwmon_info = {
+ /* LCD contrast (0-6.6V) */
+ .in[0] = &(struct s3c_hwmon_chcfg) {
+ .name = "lcd-contrast",
+ .mult = 3300,
+ .div = 512,
+ },
+ /* LED current feedback */
+ .in[1] = &(struct s3c_hwmon_chcfg) {
+ .name = "led-feedback",
+ .mult = 3300,
+ .div = 1024,
+ },
+ /* LCD feedback (0-6.6V) */
+ .in[2] = &(struct s3c_hwmon_chcfg) {
+ .name = "lcd-feedback",
+ .mult = 3300,
+ .div = 512,
+ },
+ /* Vcore (1.8-2.0V), Vref 3.3V */
+ .in[3] = &(struct s3c_hwmon_chcfg) {
+ .name = "vcore",
+ .mult = 3300,
+ .div = 1024,
+ },
+};
+
/* Standard BAST devices */
+// cat /sys/devices/platform/s3c24xx-adc/s3c-hwmon/in_0
static struct platform_device *bast_devices[] __initdata = {
&s3c_device_usb,
@@ -556,6 +585,8 @@ static struct platform_device *bast_devices[] __initdata = {
&s3c_device_i2c0,
&s3c_device_rtc,
&s3c_device_nand,
+ &s3c_device_adc,
+ &s3c_device_hwmon,
&bast_device_dm9k,
&bast_device_asix,
&bast_device_axpp,
@@ -588,6 +619,7 @@ static void __init bast_map_io(void)
s3c24xx_register_clocks(bast_clocks, ARRAY_SIZE(bast_clocks));
s3c_device_nand.dev.platform_data = &bast_nand_info;
+ s3c_device_hwmon.dev.platform_data = &bast_hwmon_info;
s3c24xx_init_io(bast_iodesc, ARRAY_SIZE(bast_iodesc));
s3c24xx_init_clocks(0);
diff --git a/arch/arm/mach-s3c6410/Kconfig b/arch/arm/mach-s3c6410/Kconfig
index e63aac7f4e5a..f9d0f09f9761 100644
--- a/arch/arm/mach-s3c6410/Kconfig
+++ b/arch/arm/mach-s3c6410/Kconfig
@@ -97,3 +97,13 @@ config MACH_NCP
select S3C64XX_SETUP_I2C1
help
Machine support for the Samsung NCP
+
+config MACH_HMT
+ bool "Airgoo HMT"
+ select CPU_S3C6410
+ select S3C_DEV_FB
+ select S3C_DEV_USB_HOST
+ select S3C64XX_SETUP_FB_24BPP
+ select HAVE_PWM
+ help
+ Machine support for the Airgoo HMT
diff --git a/arch/arm/mach-s3c6410/Makefile b/arch/arm/mach-s3c6410/Makefile
index 6f9deac88612..3e48c3dbf973 100644
--- a/arch/arm/mach-s3c6410/Makefile
+++ b/arch/arm/mach-s3c6410/Makefile
@@ -23,5 +23,4 @@ obj-$(CONFIG_S3C6410_SETUP_SDHCI) += setup-sdhci.o
obj-$(CONFIG_MACH_ANW6410) += mach-anw6410.o
obj-$(CONFIG_MACH_SMDK6410) += mach-smdk6410.o
obj-$(CONFIG_MACH_NCP) += mach-ncp.o
-
-
+obj-$(CONFIG_MACH_HMT) += mach-hmt.o
diff --git a/arch/arm/mach-s3c6410/mach-hmt.c b/arch/arm/mach-s3c6410/mach-hmt.c
new file mode 100644
index 000000000000..c5741056193f
--- /dev/null
+++ b/arch/arm/mach-s3c6410/mach-hmt.c
@@ -0,0 +1,276 @@
+/* mach-hmt.c - Platform code for Airgoo HMT
+ *
+ * Copyright 2009 Peter Korsgaard <jacmet@sunsite.dk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+*/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/i2c.h>
+#include <linux/fb.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/leds.h>
+#include <linux/pwm_backlight.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/regs-fb.h>
+#include <mach/map.h>
+
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+
+#include <plat/regs-serial.h>
+#include <plat/iic.h>
+#include <plat/fb.h>
+#include <plat/nand.h>
+
+#include <plat/s3c6410.h>
+#include <plat/clock.h>
+#include <plat/devs.h>
+#include <plat/cpu.h>
+
+#define UCON S3C2410_UCON_DEFAULT
+#define ULCON (S3C2410_LCON_CS8 | S3C2410_LCON_PNONE)
+#define UFCON (S3C2410_UFCON_RXTRIG8 | S3C2410_UFCON_FIFOMODE)
+
+static struct s3c2410_uartcfg hmt_uartcfgs[] __initdata = {
+ [0] = {
+ .hwport = 0,
+ .flags = 0,
+ .ucon = UCON,
+ .ulcon = ULCON,
+ .ufcon = UFCON,
+ },
+ [1] = {
+ .hwport = 1,
+ .flags = 0,
+ .ucon = UCON,
+ .ulcon = ULCON,
+ .ufcon = UFCON,
+ },
+ [2] = {
+ .hwport = 2,
+ .flags = 0,
+ .ucon = UCON,
+ .ulcon = ULCON,
+ .ufcon = UFCON,
+ },
+};
+
+static int hmt_bl_init(struct device *dev)
+{
+ int ret;
+
+ ret = gpio_request(S3C64XX_GPB(4), "lcd backlight enable");
+ if (!ret)
+ ret = gpio_direction_output(S3C64XX_GPB(4), 0);
+
+ return ret;
+}
+
+static int hmt_bl_notify(int brightness)
+{
+ /*
+ * translate from CIELUV/CIELAB L*->brightness, E.G. from
+ * perceived luminance to light output. Assumes range 0..25600
+ */
+ if (brightness < 0x800) {
+ /* Y = Yn * L / 903.3 */
+ brightness = (100*256 * brightness + 231245/2) / 231245;
+ } else {
+ /* Y = Yn * ((L + 16) / 116 )^3 */
+ int t = (brightness*4 + 16*1024 + 58)/116;
+ brightness = 25 * ((t * t * t + 0x100000/2) / 0x100000);
+ }
+
+ gpio_set_value(S3C64XX_GPB(4), brightness);
+
+ return brightness;
+}
+
+static void hmt_bl_exit(struct device *dev)
+{
+ gpio_free(S3C64XX_GPB(4));
+}
+
+static struct platform_pwm_backlight_data hmt_backlight_data = {
+ .pwm_id = 1,
+ .max_brightness = 100 * 256,
+ .dft_brightness = 40 * 256,
+ .pwm_period_ns = 1000000000 / (100 * 256 * 20),
+ .init = hmt_bl_init,
+ .notify = hmt_bl_notify,
+ .exit = hmt_bl_exit,
+
+};
+
+static struct platform_device hmt_backlight_device = {
+ .name = "pwm-backlight",
+ .dev = {
+ .parent = &s3c_device_timer[1].dev,
+ .platform_data = &hmt_backlight_data,
+ },
+};
+
+static struct s3c_fb_pd_win hmt_fb_win0 = {
+ .win_mode = {
+ .pixclock = 41094,
+ .left_margin = 8,
+ .right_margin = 13,
+ .upper_margin = 7,
+ .lower_margin = 5,
+ .hsync_len = 3,
+ .vsync_len = 1,
+ .xres = 800,
+ .yres = 480,
+ },
+ .max_bpp = 32,
+ .default_bpp = 16,
+};
+
+/* 405566 clocks per frame => 60Hz refresh requires 24333960Hz clock */
+static struct s3c_fb_platdata hmt_lcd_pdata __initdata = {
+ .setup_gpio = s3c64xx_fb_gpio_setup_24bpp,
+ .win[0] = &hmt_fb_win0,
+ .vidcon0 = VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB,
+ .vidcon1 = VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC,
+};
+
+static struct mtd_partition hmt_nand_part[] = {
+ [0] = {
+ .name = "uboot",
+ .size = SZ_512K,
+ .offset = 0,
+ },
+ [1] = {
+ .name = "uboot-env1",
+ .size = SZ_256K,
+ .offset = SZ_512K,
+ },
+ [2] = {
+ .name = "uboot-env2",
+ .size = SZ_256K,
+ .offset = SZ_512K + SZ_256K,
+ },
+ [3] = {
+ .name = "kernel",
+ .size = SZ_2M,
+ .offset = SZ_1M,
+ },
+ [4] = {
+ .name = "rootfs",
+ .size = MTDPART_SIZ_FULL,
+ .offset = SZ_1M + SZ_2M,
+ },
+};
+
+static struct s3c2410_nand_set hmt_nand_sets[] = {
+ [0] = {
+ .name = "nand",
+ .nr_chips = 1,
+ .nr_partitions = ARRAY_SIZE(hmt_nand_part),
+ .partitions = hmt_nand_part,
+ },
+};
+
+static struct s3c2410_platform_nand hmt_nand_info = {
+ .tacls = 25,
+ .twrph0 = 55,
+ .twrph1 = 40,
+ .nr_sets = ARRAY_SIZE(hmt_nand_sets),
+ .sets = hmt_nand_sets,
+};
+
+static struct gpio_led hmt_leds[] = {
+ { /* left function keys */
+ .name = "left:blue",
+ .gpio = S3C64XX_GPO(12),
+ .default_trigger = "default-on",
+ },
+ { /* right function keys - red */
+ .name = "right:red",
+ .gpio = S3C64XX_GPO(13),
+ },
+ { /* right function keys - green */
+ .name = "right:green",
+ .gpio = S3C64XX_GPO(14),
+ },
+ { /* right function keys - blue */
+ .name = "right:blue",
+ .gpio = S3C64XX_GPO(15),
+ .default_trigger = "default-on",
+ },
+};
+
+static struct gpio_led_platform_data hmt_led_data = {
+ .num_leds = ARRAY_SIZE(hmt_leds),
+ .leds = hmt_leds,
+};
+
+static struct platform_device hmt_leds_device = {
+ .name = "leds-gpio",
+ .id = -1,
+ .dev.platform_data = &hmt_led_data,
+};
+
+static struct map_desc hmt_iodesc[] = {};
+
+static struct platform_device *hmt_devices[] __initdata = {
+ &s3c_device_i2c0,
+ &s3c_device_nand,
+ &s3c_device_fb,
+ &s3c_device_usb,
+ &s3c_device_timer[1],
+ &hmt_backlight_device,
+ &hmt_leds_device,
+};
+
+static void __init hmt_map_io(void)
+{
+ s3c64xx_init_io(hmt_iodesc, ARRAY_SIZE(hmt_iodesc));
+ s3c24xx_init_clocks(12000000);
+ s3c24xx_init_uarts(hmt_uartcfgs, ARRAY_SIZE(hmt_uartcfgs));
+}
+
+static void __init hmt_machine_init(void)
+{
+ s3c_i2c0_set_platdata(NULL);
+ s3c_fb_set_platdata(&hmt_lcd_pdata);
+ s3c_device_nand.dev.platform_data = &hmt_nand_info;
+
+ gpio_request(S3C64XX_GPC(7), "usb power");
+ gpio_direction_output(S3C64XX_GPC(7), 0);
+ gpio_request(S3C64XX_GPM(0), "usb power");
+ gpio_direction_output(S3C64XX_GPM(0), 1);
+ gpio_request(S3C64XX_GPK(7), "usb power");
+ gpio_direction_output(S3C64XX_GPK(7), 1);
+ gpio_request(S3C64XX_GPF(13), "usb power");
+ gpio_direction_output(S3C64XX_GPF(13), 1);
+
+ platform_add_devices(hmt_devices, ARRAY_SIZE(hmt_devices));
+}
+
+MACHINE_START(HMT, "Airgoo-HMT")
+ /* Maintainer: Peter Korsgaard <jacmet@sunsite.dk> */
+ .phys_io = S3C_PA_UART & 0xfff00000,
+ .io_pg_offst = (((u32)S3C_VA_UART) >> 18) & 0xfffc,
+ .boot_params = S3C64XX_PA_SDRAM + 0x100,
+ .init_irq = s3c6410_init_irq,
+ .map_io = hmt_map_io,
+ .init_machine = hmt_machine_init,
+ .timer = &s3c24xx_timer,
+MACHINE_END
diff --git a/arch/arm/plat-s3c/include/plat/adc.h b/arch/arm/plat-s3c/include/plat/adc.h
index d847bd476b6c..5f3b1cd53b90 100644
--- a/arch/arm/plat-s3c/include/plat/adc.h
+++ b/arch/arm/plat-s3c/include/plat/adc.h
@@ -19,10 +19,14 @@ struct s3c_adc_client;
extern int s3c_adc_start(struct s3c_adc_client *client,
unsigned int channel, unsigned int nr_samples);
+extern int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch);
+
extern struct s3c_adc_client *
s3c_adc_register(struct platform_device *pdev,
- void (*select)(unsigned selected),
- void (*conv)(unsigned d0, unsigned d1,
+ void (*select)(struct s3c_adc_client *client,
+ unsigned selected),
+ void (*conv)(struct s3c_adc_client *client,
+ unsigned d0, unsigned d1,
unsigned *samples_left),
unsigned int is_ts);
diff --git a/arch/arm/plat-s3c/include/plat/devs.h b/arch/arm/plat-s3c/include/plat/devs.h
index 2e6599411c28..0f540ea1e999 100644
--- a/arch/arm/plat-s3c/include/plat/devs.h
+++ b/arch/arm/plat-s3c/include/plat/devs.h
@@ -46,6 +46,8 @@ extern struct platform_device s3c_device_hsmmc2;
extern struct platform_device s3c_device_spi0;
extern struct platform_device s3c_device_spi1;
+extern struct platform_device s3c_device_hwmon;
+
extern struct platform_device s3c_device_nand;
extern struct platform_device s3c_device_usbgadget;
diff --git a/arch/arm/plat-s3c/include/plat/hwmon.h b/arch/arm/plat-s3c/include/plat/hwmon.h
new file mode 100644
index 000000000000..1ba88ea0aa31
--- /dev/null
+++ b/arch/arm/plat-s3c/include/plat/hwmon.h
@@ -0,0 +1,41 @@
+/* linux/arch/arm/plat-s3c/include/plat/hwmon.h
+ *
+ * Copyright 2005 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ * http://armlinux.simtec.co.uk/
+ *
+ * S3C - HWMon interface for ADC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#ifndef __ASM_ARCH_ADC_HWMON_H
+#define __ASM_ARCH_ADC_HWMON_H __FILE__
+
+/**
+ * s3c_hwmon_chcfg - channel configuration
+ * @name: The name to give this channel.
+ * @mult: Multiply the ADC value read by this.
+ * @div: Divide the value from the ADC by this.
+ *
+ * The value read from the ADC is converted to a value that
+ * hwmon expects (mV) by result = (value_read * @mult) / @div.
+ */
+struct s3c_hwmon_chcfg {
+ const char *name;
+ unsigned int mult;
+ unsigned int div;
+};
+
+/**
+ * s3c_hwmon_pdata - HWMON platform data
+ * @in: One configuration for each possible channel used.
+ */
+struct s3c_hwmon_pdata {
+ struct s3c_hwmon_chcfg *in[8];
+};
+
+#endif /* __ASM_ARCH_ADC_HWMON_H */
+
diff --git a/arch/arm/plat-s3c24xx/adc.c b/arch/arm/plat-s3c24xx/adc.c
index ee1baf11ad9e..11117a7ba911 100644
--- a/arch/arm/plat-s3c24xx/adc.c
+++ b/arch/arm/plat-s3c24xx/adc.c
@@ -39,13 +39,16 @@
struct s3c_adc_client {
struct platform_device *pdev;
struct list_head pend;
+ wait_queue_head_t *wait;
unsigned int nr_samples;
+ int result;
unsigned char is_ts;
unsigned char channel;
- void (*select_cb)(unsigned selected);
- void (*convert_cb)(unsigned val1, unsigned val2,
+ void (*select_cb)(struct s3c_adc_client *c, unsigned selected);
+ void (*convert_cb)(struct s3c_adc_client *c,
+ unsigned val1, unsigned val2,
unsigned *samples_left);
};
@@ -81,7 +84,7 @@ static inline void s3c_adc_select(struct adc_device *adc,
{
unsigned con = readl(adc->regs + S3C2410_ADCCON);
- client->select_cb(1);
+ client->select_cb(client, 1);
con &= ~S3C2410_ADCCON_MUXMASK;
con &= ~S3C2410_ADCCON_STDBM;
@@ -153,25 +156,61 @@ int s3c_adc_start(struct s3c_adc_client *client,
}
EXPORT_SYMBOL_GPL(s3c_adc_start);
-static void s3c_adc_default_select(unsigned select)
+static void s3c_convert_done(struct s3c_adc_client *client,
+ unsigned v, unsigned u, unsigned *left)
+{
+ client->result = v;
+ wake_up(client->wait);
+}
+
+int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
+{
+ DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
+ int ret;
+
+ client->convert_cb = s3c_convert_done;
+ client->wait = &wake;
+ client->result = -1;
+
+ ret = s3c_adc_start(client, ch, 1);
+ if (ret < 0)
+ goto err;
+
+ ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
+ if (client->result < 0) {
+ ret = -ETIMEDOUT;
+ goto err;
+ }
+
+ client->convert_cb = NULL;
+ return client->result;
+
+err:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(s3c_adc_convert);
+
+static void s3c_adc_default_select(struct s3c_adc_client *client,
+ unsigned select)
{
}
struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev,
- void (*select)(unsigned int selected),
- void (*conv)(unsigned d0, unsigned d1,
+ void (*select)(struct s3c_adc_client *client,
+ unsigned int selected),
+ void (*conv)(struct s3c_adc_client *client,
+ unsigned d0, unsigned d1,
unsigned *samples_left),
unsigned int is_ts)
{
struct s3c_adc_client *client;
WARN_ON(!pdev);
- WARN_ON(!conv);
if (!select)
select = s3c_adc_default_select;
- if (!conv || !pdev)
+ if (!pdev)
return ERR_PTR(-EINVAL);
client = kzalloc(sizeof(struct s3c_adc_client), GFP_KERNEL);
@@ -230,16 +269,19 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
client->nr_samples--;
- (client->convert_cb)(data0 & 0x3ff, data1 & 0x3ff, &client->nr_samples);
+
+ if (client->convert_cb)
+ (client->convert_cb)(client, data0 & 0x3ff, data1 & 0x3ff,
+ &client->nr_samples);
if (client->nr_samples > 0) {
/* fire another conversion for this */
- client->select_cb(1);
+ client->select_cb(client, 1);
s3c_adc_convert(adc);
} else {
local_irq_save(flags);
- (client->select_cb)(0);
+ (client->select_cb)(client, 0);
adc->cur = NULL;
s3c_adc_try(adc);
diff --git a/arch/arm/plat-s3c24xx/devs.c b/arch/arm/plat-s3c24xx/devs.c
index 4553ad6c7adc..656b375db46f 100644
--- a/arch/arm/plat-s3c24xx/devs.c
+++ b/arch/arm/plat-s3c24xx/devs.c
@@ -350,7 +350,7 @@ struct platform_device s3c_device_adc = {
/* HWMON */
struct platform_device s3c_device_hwmon = {
- .name = "s3c24xx-hwmon",
+ .name = "s3c-hwmon",
.id = -1,
.dev.parent = &s3c_device_adc.dev,
};
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 2d5016691d40..2e25b7a827d3 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -702,6 +702,23 @@ config SENSORS_SHT15
This driver can also be built as a module. If so, the module
will be called sht15.
+config SENSORS_S3C
+ tristate "S3C24XX/S3C64XX Inbuilt ADC"
+ depends on ARCH_S3C2410 || ARCH_S3C64XX
+ help
+ If you say yes here you get support for the on-board ADCs of
+ the Samsung S3C24XX or S3C64XX series of SoC
+
+ This driver can also be built as a module. If so, the module
+ will be called s3c-hwmo.
+
+config SENSORS_S3C_RAW
+ bool "Include raw channel attributes in sysfs"
+ depends on SENSORS_S3C
+ help
+ Say Y here if you want to include raw copies of all the ADC
+ channels in sysfs.
+
config SENSORS_SIS5595
tristate "Silicon Integrated Systems Corp. SiS5595"
depends on PCI
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index b793dce6bed5..7f239a247c33 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -76,6 +76,7 @@ obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
+obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o
obj-$(CONFIG_SENSORS_SHT15) += sht15.o
obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
diff --git a/drivers/hwmon/s3c-hwmon.c b/drivers/hwmon/s3c-hwmon.c
new file mode 100644
index 000000000000..3a524f2fe493
--- /dev/null
+++ b/drivers/hwmon/s3c-hwmon.c
@@ -0,0 +1,405 @@
+/* linux/drivers/hwmon/s3c-hwmon.c
+ *
+ * Copyright (C) 2005, 2008, 2009 Simtec Electronics
+ * http://armlinux.simtec.co.uk/
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C24XX/S3C64XX ADC hwmon support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#include <plat/adc.h>
+#include <plat/hwmon.h>
+
+struct s3c_hwmon_attr {
+ struct sensor_device_attribute in;
+ struct sensor_device_attribute label;
+ char in_name[12];
+ char label_name[12];
+};
+
+/**
+ * struct s3c_hwmon - ADC hwmon client information
+ * @lock: Access lock to serialise the conversions.
+ * @client: The client we registered with the S3C ADC core.
+ * @hwmon_dev: The hwmon device we created.
+ * @attr: The holders for the channel attributes.
+*/
+struct s3c_hwmon {
+ struct semaphore lock;
+ struct s3c_adc_client *client;
+ struct device *hwmon_dev;
+
+ struct s3c_hwmon_attr attrs[8];
+};
+
+/**
+ * s3c_hwmon_read_ch - read a value from a given adc channel.
+ * @dev: The device.
+ * @hwmon: Our state.
+ * @channel: The channel we're reading from.
+ *
+ * Read a value from the @channel with the proper locking and sleep until
+ * either the read completes or we timeout awaiting the ADC core to get
+ * back to us.
+ */
+static int s3c_hwmon_read_ch(struct device *dev,
+ struct s3c_hwmon *hwmon, int channel)
+{
+ int ret;
+
+ ret = down_interruptible(&hwmon->lock);
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(dev, "reading channel %d\n", channel);
+
+ ret = s3c_adc_read(hwmon->client, channel);
+ up(&hwmon->lock);
+
+ return ret;
+}
+
+#ifdef CONFIG_SENSORS_S3C_RAW
+/**
+ * s3c_hwmon_show_raw - show a conversion from the raw channel number.
+ * @dev: The device that the attribute belongs to.
+ * @attr: The attribute being read.
+ * @buf: The result buffer.
+ *
+ * This show deals with the raw attribute, registered for each possible
+ * ADC channel. This does a conversion and returns the raw (un-scaled)
+ * value returned from the hardware.
+ */
+static ssize_t s3c_hwmon_show_raw(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct s3c_hwmon *adc = platform_get_drvdata(to_platform_device(dev));
+ struct sensor_device_attribute *sa = to_sensor_dev_attr(attr);
+ int ret;
+
+ ret = s3c_hwmon_read_ch(dev, adc, sa->index);
+
+ return (ret < 0) ? ret : snprintf(buf, PAGE_SIZE, "%d\n", ret);
+}
+
+#define DEF_ADC_ATTR(x) \
+ static SENSOR_DEVICE_ATTR(adc##x##_raw, S_IRUGO, s3c_hwmon_show_raw, NULL, x)
+
+DEF_ADC_ATTR(0);
+DEF_ADC_ATTR(1);
+DEF_ADC_ATTR(2);
+DEF_ADC_ATTR(3);
+DEF_ADC_ATTR(4);
+DEF_ADC_ATTR(5);
+DEF_ADC_ATTR(6);
+DEF_ADC_ATTR(7);
+
+static struct attribute *s3c_hwmon_attrs[9] = {
+ &sensor_dev_attr_adc0_raw.dev_attr.attr,
+ &sensor_dev_attr_adc1_raw.dev_attr.attr,
+ &sensor_dev_attr_adc2_raw.dev_attr.attr,
+ &sensor_dev_attr_adc3_raw.dev_attr.attr,
+ &sensor_dev_attr_adc4_raw.dev_attr.attr,
+ &sensor_dev_attr_adc5_raw.dev_attr.attr,
+ &sensor_dev_attr_adc6_raw.dev_attr.attr,
+ &sensor_dev_attr_adc7_raw.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group s3c_hwmon_attrgroup = {
+ .attrs = s3c_hwmon_attrs,
+};
+
+static inline int s3c_hwmon_add_raw(struct device *dev)
+{
+ return sysfs_create_group(&dev->kobj, &s3c_hwmon_attrgroup);
+}
+
+static inline void s3c_hwmon_remove_raw(struct device *dev)
+{
+ sysfs_remove_group(&dev->kobj, &s3c_hwmon_attrgroup);
+}
+
+#else
+
+static inline int s3c_hwmon_add_raw(struct device *dev) { return 0; }
+static inline void s3c_hwmon_remove_raw(struct device *dev) { }
+
+#endif /* CONFIG_SENSORS_S3C_RAW */
+
+/**
+ * s3c_hwmon_ch_show - show value of a given channel
+ * @dev: The device that the attribute belongs to.
+ * @attr: The attribute being read.
+ * @buf: The result buffer.
+ *
+ * Read a value from the ADC and scale it before returning it to the
+ * caller. The scale factor is gained from the channel configuration
+ * passed via the platform data when the device was registered.
+ */
+static ssize_t s3c_hwmon_ch_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
+ struct s3c_hwmon *hwmon = platform_get_drvdata(to_platform_device(dev));
+ struct s3c_hwmon_pdata *pdata = dev->platform_data;
+ struct s3c_hwmon_chcfg *cfg;
+ int ret;
+
+ cfg = pdata->in[sen_attr->index];
+
+ ret = s3c_hwmon_read_ch(dev, hwmon, sen_attr->index);
+ if (ret < 0)
+ return ret;
+
+ ret *= cfg->mult;
+ ret = DIV_ROUND_CLOSEST(ret, cfg->div);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", ret);
+}
+
+/**
+ * s3c_hwmon_label_show - show label name of the given channel.
+ * @dev: The device that the attribute belongs to.
+ * @attr: The attribute being read.
+ * @buf: The result buffer.
+ *
+ * Return the label name of a given channel
+ */
+static ssize_t s3c_hwmon_label_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sen_attr = to_sensor_dev_attr(attr);
+ struct s3c_hwmon_pdata *pdata = dev->platform_data;
+ struct s3c_hwmon_chcfg *cfg;
+
+ cfg = pdata->in[sen_attr->index];
+
+ return snprintf(buf, PAGE_SIZE, "%s\n", cfg->name);
+}
+
+/**
+ * s3c_hwmon_create_attr - create hwmon attribute for given channel.
+ * @dev: The device to create the attribute on.
+ * @cfg: The channel configuration passed from the platform data.
+ * @channel: The ADC channel number to process.
+ *
+ * Create the scaled attribute for use with hwmon from the specified
+ * platform data in @pdata. The sysfs entry is handled by the routine
+ * s3c_hwmon_ch_show().
+ *
+ * The attribute name is taken from the configuration data if present
+ * otherwise the name is taken by concatenating in_ with the channel
+ * number.
+ */
+static int s3c_hwmon_create_attr(struct device *dev,
+ struct s3c_hwmon_chcfg *cfg,
+ struct s3c_hwmon_attr *attrs,
+ int channel)
+{
+ struct sensor_device_attribute *attr;
+ int ret;
+
+ snprintf(attrs->in_name, sizeof(attrs->in_name), "in%d_input", channel);
+
+ attr = &attrs->in;
+ attr->index = channel;
+ attr->dev_attr.attr.name = attrs->in_name;
+ attr->dev_attr.attr.mode = S_IRUGO;
+ attr->dev_attr.attr.owner = THIS_MODULE;
+ attr->dev_attr.show = s3c_hwmon_ch_show;
+
+ ret = device_create_file(dev, &attr->dev_attr);
+ if (ret < 0) {
+ dev_err(dev, "failed to create input attribute\n");
+ return ret;
+ }
+
+ /* if this has a name, add a label */
+ if (cfg->name) {
+ snprintf(attrs->label_name, sizeof(attrs->label_name),
+ "in%d_label", channel);
+
+ attr = &attrs->label;
+ attr->index = channel;
+ attr->dev_attr.attr.name = attrs->label_name;
+ attr->dev_attr.attr.mode = S_IRUGO;
+ attr->dev_attr.attr.owner = THIS_MODULE;
+ attr->dev_attr.show = s3c_hwmon_label_show;
+
+ ret = device_create_file(dev, &attr->dev_attr);
+ if (ret < 0) {
+ device_remove_file(dev, &attrs->in.dev_attr);
+ dev_err(dev, "failed to create label attribute\n");
+ }
+ }
+
+ return ret;
+}
+
+static void s3c_hwmon_remove_attr(struct device *dev,
+ struct s3c_hwmon_attr *attrs)
+{
+ device_remove_file(dev, &attrs->in.dev_attr);
+ device_remove_file(dev, &attrs->label.dev_attr);
+}
+
+/**
+ * s3c_hwmon_probe - device probe entry.
+ * @dev: The device being probed.
+*/
+static int __devinit s3c_hwmon_probe(struct platform_device *dev)
+{
+ struct s3c_hwmon_pdata *pdata = dev->dev.platform_data;
+ struct s3c_hwmon *hwmon;
+ int ret = 0;
+ int i;
+
+ if (!pdata) {
+ dev_err(&dev->dev, "no platform data supplied\n");
+ return -EINVAL;
+ }
+
+ hwmon = kzalloc(sizeof(struct s3c_hwmon), GFP_KERNEL);
+ if (hwmon == NULL) {
+ dev_err(&dev->dev, "no memory\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(dev, hwmon);
+
+ init_MUTEX(&hwmon->lock);
+
+ /* Register with the core ADC driver. */
+
+ hwmon->client = s3c_adc_register(dev, NULL, NULL, 0);
+ if (IS_ERR(hwmon->client)) {
+ dev_err(&dev->dev, "cannot register adc\n");
+ ret = PTR_ERR(hwmon->client);
+ goto err_mem;
+ }
+
+ /* add attributes for our adc devices. */
+
+ ret = s3c_hwmon_add_raw(&dev->dev);
+ if (ret)
+ goto err_registered;
+
+ /* register with the hwmon core */
+
+ hwmon->hwmon_dev = hwmon_device_register(&dev->dev);
+ if (IS_ERR(hwmon->hwmon_dev)) {
+ dev_err(&dev->dev, "error registering with hwmon\n");
+ ret = PTR_ERR(hwmon->hwmon_dev);
+ goto err_raw_attribute;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(pdata->in); i++) {
+ if (!pdata->in[i])
+ continue;
+
+ if (pdata->in[i]->mult >= 0x10000)
+ dev_warn(&dev->dev,
+ "channel %d multiplier too large\n",
+ i);
+
+ ret = s3c_hwmon_create_attr(&dev->dev, pdata->in[i],
+ &hwmon->attrs[i], i);
+ if (ret) {
+ dev_err(&dev->dev,
+ "error creating channel %d\n", i);
+
+ for (i--; i >= 0; i--)
+ s3c_hwmon_remove_attr(&dev->dev,
+ &hwmon->attrs[i]);
+
+ goto err_hwmon_register;
+ }
+ }
+
+ return 0;
+
+ err_hwmon_register:
+ hwmon_device_unregister(hwmon->hwmon_dev);
+
+ err_raw_attribute:
+ s3c_hwmon_remove_raw(&dev->dev);
+
+ err_registered:
+ s3c_adc_release(hwmon->client);
+
+ err_mem:
+ kfree(hwmon);
+ return ret;
+}
+
+static int __devexit s3c_hwmon_remove(struct platform_device *dev)
+{
+ struct s3c_hwmon *hwmon = platform_get_drvdata(dev);
+ int i;
+
+ s3c_hwmon_remove_raw(&dev->dev);
+
+ for (i = 0; i < ARRAY_SIZE(hwmon->attrs); i++)
+ s3c_hwmon_remove_attr(&dev->dev, &hwmon->attrs[i]);
+
+ hwmon_device_unregister(hwmon->hwmon_dev);
+ s3c_adc_release(hwmon->client);
+
+ return 0;
+}
+
+static struct platform_driver s3c_hwmon_driver = {
+ .driver = {
+ .name = "s3c-hwmon",
+ .owner = THIS_MODULE,
+ },
+ .probe = s3c_hwmon_probe,
+ .remove = __devexit_p(s3c_hwmon_remove),
+};
+
+static int __init s3c_hwmon_init(void)
+{
+ return platform_driver_register(&s3c_hwmon_driver);
+}
+
+static void __exit s3c_hwmon_exit(void)
+{
+ platform_driver_unregister(&s3c_hwmon_driver);
+}
+
+module_init(s3c_hwmon_init);
+module_exit(s3c_hwmon_exit);
+
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("S3C ADC HWMon driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:s3c-hwmon");
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