/* * cx18 gpio functions * * Derived from ivtv-gpio.c * * Copyright (C) 2007 Hans Verkuil * Copyright (C) 2008 Andy Walls * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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 "cx18-driver.h" #include "cx18-io.h" #include "cx18-cards.h" #include "cx18-gpio.h" #include "tuner-xc2028.h" /********************* GPIO stuffs *********************/ /* GPIO registers */ #define CX18_REG_GPIO_IN 0xc72010 #define CX18_REG_GPIO_OUT1 0xc78100 #define CX18_REG_GPIO_DIR1 0xc78108 #define CX18_REG_GPIO_OUT2 0xc78104 #define CX18_REG_GPIO_DIR2 0xc7810c /* * HVR-1600 GPIO pins, courtesy of Hauppauge: * * gpio0: zilog ir process reset pin * gpio1: zilog programming pin (you should never use this) * gpio12: cx24227 reset pin * gpio13: cs5345 reset pin */ /* * File scope utility functions */ static void gpio_write(struct cx18 *cx) { u32 dir_lo = cx->gpio_dir & 0xffff; u32 val_lo = cx->gpio_val & 0xffff; u32 dir_hi = cx->gpio_dir >> 16; u32 val_hi = cx->gpio_val >> 16; cx18_write_reg_expect(cx, dir_lo << 16, CX18_REG_GPIO_DIR1, ~dir_lo, dir_lo); cx18_write_reg_expect(cx, (dir_lo << 16) | val_lo, CX18_REG_GPIO_OUT1, val_lo, dir_lo); cx18_write_reg_expect(cx, dir_hi << 16, CX18_REG_GPIO_DIR2, ~dir_hi, dir_hi); cx18_write_reg_expect(cx, (dir_hi << 16) | val_hi, CX18_REG_GPIO_OUT2, val_hi, dir_hi); } static void gpio_update(struct cx18 *cx, u32 mask, u32 data) { if (mask == 0) return; mutex_lock(&cx->gpio_lock); cx->gpio_val = (cx->gpio_val & ~mask) | (data & mask); gpio_write(cx); mutex_unlock(&cx->gpio_lock); } static void gpio_reset_seq(struct cx18 *cx, u32 active_lo, u32 active_hi, unsigned int assert_msecs, unsigned int recovery_msecs) { u32 mask; mask = active_lo | active_hi; if (mask == 0) return; /* * Assuming that active_hi and active_lo are a subsets of the bits in * gpio_dir. Also assumes that active_lo and active_hi don't overlap * in any bit position */ /* Assert */ gpio_update(cx, mask, ~active_lo); schedule_timeout_uninterruptible(msecs_to_jiffies(assert_msecs)); /* Deassert */ gpio_update(cx, mask, ~active_hi); schedule_timeout_uninterruptible(msecs_to_jiffies(recovery_msecs)); } /* * GPIO Multiplexer - logical device */ static int gpiomux_log_status(struct v4l2_subdev *sd) { struct cx18 *cx = v4l2_get_subdevdata(sd); mutex_lock(&cx->gpio_lock); CX18_INFO_DEV(sd, "GPIO: direction 0x%08x, value 0x%08x\n", cx->gpio_dir, cx->gpio_val); mutex_unlock(&cx->gpio_lock); return 0; } static int gpiomux_s_radio(struct v4l2_subdev *sd) { struct cx18 *cx = v4l2_get_subdevdata(sd); /* * FIXME - work out the cx->active/audio_input mess - this is * intended to handle the switch to radio mode and set the * audio routing, but we need to update the state in cx */ gpio_update(cx, cx->card->gpio_audio_input.mask, cx->card->gpio_audio_input.radio); return 0; } static int gpiomux_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) { struct cx18 *cx = v4l2_get_subdevdata(sd); u32 data; switch (cx->card->audio_inputs[cx->audio_input].muxer_input) { case 1: data = cx->card->gpio_audio_input.linein; break; case 0: data = cx->card->gpio_audio_input.tuner; break; default: /* * FIXME - work out the cx->active/audio_input mess - this is * intended to handle the switch from radio mode and set the * audio routing, but we need to update the state in cx */ data = cx->card->gpio_audio_input.tuner; break; } gpio_update(cx, cx->card->gpio_audio_input.mask, data); return 0; } static int gpiomux_s_audio_routing(struct v4l2_subdev *sd, u32 input, u32 output, u32 config) { struct cx18 *cx = v4l2_get_subdevdata(sd); u32 data; switch (input) { case 0: data = cx->card->gpio_audio_input.tuner; break; case 1: data = cx->card->gpio_audio_input.linein; break; case 2: data = cx->card->gpio_audio_input.radio; break; default: return -EINVAL; } gpio_update(cx, cx->card->gpio_audio_input.mask, data); return 0; } static const struct v4l2_subdev_core_ops gpiomux_core_ops = { .log_status = gpiomux_log_status, .s_std = gpiomux_s_std, }; static const struct v4l2_subdev_tuner_ops gpiomux_tuner_ops = { .s_radio = gpiomux_s_radio, }; static const struct v4l2_subdev_audio_ops gpiomux_audio_ops = { .s_routing = gpiomux_s_audio_routing, }; static const struct v4l2_subdev_ops gpiomux_ops = { .core = &gpiomux_core_ops, .tuner = &gpiomux_tuner_ops, .audio = &gpiomux_audio_ops, }; /* * GPIO Reset Controller - logical device */ static int resetctrl_log_status(struct v4l2_subdev *sd) { struct cx18 *cx = v4l2_get_subdevdata(sd); mutex_lock(&cx->gpio_lock); CX18_INFO_DEV(sd, "GPIO: direction 0x%08x, value 0x%08x\n", cx->gpio_dir, cx->gpio_val); mutex_unlock(&cx->gpio_lock); return 0; } static int resetctrl_reset(struct v4l2_subdev *sd, u32 val) { struct cx18 *cx = v4l2_get_subdevdata(sd); const struct cx18_gpio_i2c_slave_reset *p; p = &cx->card->gpio_i2c_slave_reset; switch (val) { case CX18_GPIO_RESET_I2C: gpio_reset_seq(cx, p->active_lo_mask, p->active_hi_mask, p->msecs_asserted, p->msecs_recovery); break; case CX18_GPIO_RESET_Z8F0811: /* * Assert timing for the Z8F0811 on HVR-1600 boards: * 1. Assert RESET for min of 4 clock cycles at 18.432 MHz to * initiate * 2. Reset then takes 66 WDT cycles at 10 kHz + 16 xtal clock * cycles (6,601,085 nanoseconds ~= 7 milliseconds) * 3. DBG pin must be high before chip exits reset for normal * operation. DBG is open drain and hopefully pulled high * since we don't normally drive it (GPIO 1?) for the * HVR-1600 * 4. Z8F0811 won't exit reset until RESET is deasserted * 5. Zilog comes out of reset, loads reset vector address and * executes from there. Required recovery delay unknown. */ gpio_reset_seq(cx, p->ir_reset_mask, 0, p->msecs_asserted, p->msecs_recovery); break; case CX18_GPIO_RESET_XC2028: if (cx->card->tuners[0].tuner == TUNER_XC2028) gpio_reset_seq(cx, (1 << cx->card->xceive_pin), 0, 1, 1); break; } return 0; } static const struct v4l2_subdev_core_ops resetctrl_core_ops = { .log_status = resetctrl_log_status, .reset = resetctrl_reset, }; static const struct v4l2_subdev_ops resetctrl_ops = { .core = &resetctrl_core_ops, }; /* * External entry points */ void cx18_gpio_init(struct cx18 *cx) { mutex_lock(&cx->gpio_lock); cx->gpio_dir = cx->card->gpio_init.direction; cx->gpio_val = cx->card->gpio_init.initial_value; if (cx->card->tuners[0].tuner == TUNER_XC2028) { cx->gpio_dir |= 1 << cx->card->xceive_pin; cx->gpio_val |= 1 << cx->card->xceive_pin; } if (cx->gpio_dir == 0) { mutex_unlock(&cx->gpio_lock); return; } CX18_DEBUG_INFO("GPIO initial dir: %08x/%08x out: %08x/%08x\n", cx18_read_reg(cx, CX18_REG_GPIO_DIR1), cx18_read_reg(cx, CX18_REG_GPIO_DIR2), cx18_read_reg(cx, CX18_REG_GPIO_OUT1), cx18_read_reg(cx, CX18_REG_GPIO_OUT2)); gpio_write(cx); mutex_unlock(&cx->gpio_lock); } int cx18_gpio_register(struct cx18 *cx, u32 hw) { struct v4l2_subdev *sd; const struct v4l2_subdev_ops *ops; char *str; switch (hw) { case CX18_HW_GPIO_MUX: sd = &cx->sd_gpiomux; ops = &gpiomux_ops; str = "gpio-mux"; break; case CX18_HW_GPIO_RESET_CTRL: sd = &cx->sd_resetctrl; ops = &resetctrl_ops; str = "gpio-reset-ctrl"; break; default: return -EINVAL; } v4l2_subdev_init(sd, ops); v4l2_set_subdevdata(sd, cx); snprintf(sd->name, sizeof(sd->name), "%s %s", cx->v4l2_dev.name, str); sd->grp_id = hw; return v4l2_device_register_subdev(&cx->v4l2_dev, sd); } void cx18_reset_ir_gpio(void *data) { struct cx18 *cx = to_cx18((struct v4l2_device *)data); if (cx->card->gpio_i2c_slave_reset.ir_reset_mask == 0) return; CX18_DEBUG_INFO("Resetting IR microcontroller\n"); v4l2_subdev_call(&cx->sd_resetctrl, core, reset, CX18_GPIO_RESET_Z8F0811); } EXPORT_SYMBOL(cx18_reset_ir_gpio); /* This symbol is exported for use by lirc_pvr150 for the IR-blaster */ /* Xceive tuner reset function */ int cx18_reset_tuner_gpio(void *dev, int component, int cmd, int value) { struct i2c_algo_bit_data *algo = dev; struct cx18_i2c_algo_callback_data *cb_data = algo->data; struct cx18 *cx = cb_data->cx; if (cmd != XC2028_TUNER_RESET || cx->card->tuners[0].tuner != TUNER_XC2028) return 0; CX18_DEBUG_INFO("Resetting XCeive tuner\n"); return v4l2_subdev_call(&cx->sd_resetctrl, core, reset, CX18_GPIO_RESET_XC2028); }