diff options
Diffstat (limited to 'drivers/staging/media/solo6x10/solo6x10-i2c.c')
| -rw-r--r-- | drivers/staging/media/solo6x10/solo6x10-i2c.c | 334 |
1 files changed, 0 insertions, 334 deletions
diff --git a/drivers/staging/media/solo6x10/solo6x10-i2c.c b/drivers/staging/media/solo6x10/solo6x10-i2c.c deleted file mode 100644 index 01aa417c9258..000000000000 --- a/drivers/staging/media/solo6x10/solo6x10-i2c.c +++ /dev/null @@ -1,334 +0,0 @@ -/* - * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com> - * - * Original author: - * Ben Collins <bcollins@ubuntu.com> - * - * Additional work by: - * John Brooks <john.brooks@bluecherry.net> - * - * 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. - */ - -/* XXX: The SOLO6x10 i2c does not have separate interrupts for each i2c - * channel. The bus can only handle one i2c event at a time. The below handles - * this all wrong. We should be using the status registers to see if the bus - * is in use, and have a global lock to check the status register. Also, - * the bulk of the work should be handled out-of-interrupt. The ugly loops - * that occur during interrupt scare me. The ISR should merely signal - * thread context, ACK the interrupt, and move on. -- BenC */ - -#include <linux/kernel.h> - -#include "solo6x10.h" - -u8 solo_i2c_readbyte(struct solo_dev *solo_dev, int id, u8 addr, u8 off) -{ - struct i2c_msg msgs[2]; - u8 data; - - msgs[0].flags = 0; - msgs[0].addr = addr; - msgs[0].len = 1; - msgs[0].buf = &off; - - msgs[1].flags = I2C_M_RD; - msgs[1].addr = addr; - msgs[1].len = 1; - msgs[1].buf = &data; - - i2c_transfer(&solo_dev->i2c_adap[id], msgs, 2); - - return data; -} - -void solo_i2c_writebyte(struct solo_dev *solo_dev, int id, u8 addr, - u8 off, u8 data) -{ - struct i2c_msg msgs; - u8 buf[2]; - - buf[0] = off; - buf[1] = data; - msgs.flags = 0; - msgs.addr = addr; - msgs.len = 2; - msgs.buf = buf; - - i2c_transfer(&solo_dev->i2c_adap[id], &msgs, 1); -} - -static void solo_i2c_flush(struct solo_dev *solo_dev, int wr) -{ - u32 ctrl; - - ctrl = SOLO_IIC_CH_SET(solo_dev->i2c_id); - - if (solo_dev->i2c_state == IIC_STATE_START) - ctrl |= SOLO_IIC_START; - - if (wr) { - ctrl |= SOLO_IIC_WRITE; - } else { - ctrl |= SOLO_IIC_READ; - if (!(solo_dev->i2c_msg->flags & I2C_M_NO_RD_ACK)) - ctrl |= SOLO_IIC_ACK_EN; - } - - if (solo_dev->i2c_msg_ptr == solo_dev->i2c_msg->len) - ctrl |= SOLO_IIC_STOP; - - solo_reg_write(solo_dev, SOLO_IIC_CTRL, ctrl); -} - -static void solo_i2c_start(struct solo_dev *solo_dev) -{ - u32 addr = solo_dev->i2c_msg->addr << 1; - - if (solo_dev->i2c_msg->flags & I2C_M_RD) - addr |= 1; - - solo_dev->i2c_state = IIC_STATE_START; - solo_reg_write(solo_dev, SOLO_IIC_TXD, addr); - solo_i2c_flush(solo_dev, 1); -} - -static void solo_i2c_stop(struct solo_dev *solo_dev) -{ - solo_irq_off(solo_dev, SOLO_IRQ_IIC); - solo_reg_write(solo_dev, SOLO_IIC_CTRL, 0); - solo_dev->i2c_state = IIC_STATE_STOP; - wake_up(&solo_dev->i2c_wait); -} - -static int solo_i2c_handle_read(struct solo_dev *solo_dev) -{ -prepare_read: - if (solo_dev->i2c_msg_ptr != solo_dev->i2c_msg->len) { - solo_i2c_flush(solo_dev, 0); - return 0; - } - - solo_dev->i2c_msg_ptr = 0; - solo_dev->i2c_msg++; - solo_dev->i2c_msg_num--; - - if (solo_dev->i2c_msg_num == 0) { - solo_i2c_stop(solo_dev); - return 0; - } - - if (!(solo_dev->i2c_msg->flags & I2C_M_NOSTART)) { - solo_i2c_start(solo_dev); - } else { - if (solo_dev->i2c_msg->flags & I2C_M_RD) - goto prepare_read; - else - solo_i2c_stop(solo_dev); - } - - return 0; -} - -static int solo_i2c_handle_write(struct solo_dev *solo_dev) -{ -retry_write: - if (solo_dev->i2c_msg_ptr != solo_dev->i2c_msg->len) { - solo_reg_write(solo_dev, SOLO_IIC_TXD, - solo_dev->i2c_msg->buf[solo_dev->i2c_msg_ptr]); - solo_dev->i2c_msg_ptr++; - solo_i2c_flush(solo_dev, 1); - return 0; - } - - solo_dev->i2c_msg_ptr = 0; - solo_dev->i2c_msg++; - solo_dev->i2c_msg_num--; - - if (solo_dev->i2c_msg_num == 0) { - solo_i2c_stop(solo_dev); - return 0; - } - - if (!(solo_dev->i2c_msg->flags & I2C_M_NOSTART)) { - solo_i2c_start(solo_dev); - } else { - if (solo_dev->i2c_msg->flags & I2C_M_RD) - solo_i2c_stop(solo_dev); - else - goto retry_write; - } - - return 0; -} - -int solo_i2c_isr(struct solo_dev *solo_dev) -{ - u32 status = solo_reg_read(solo_dev, SOLO_IIC_CTRL); - int ret = -EINVAL; - - - if (CHK_FLAGS(status, SOLO_IIC_STATE_TRNS | SOLO_IIC_STATE_SIG_ERR) - || solo_dev->i2c_id < 0) { - solo_i2c_stop(solo_dev); - return -ENXIO; - } - - switch (solo_dev->i2c_state) { - case IIC_STATE_START: - if (solo_dev->i2c_msg->flags & I2C_M_RD) { - solo_dev->i2c_state = IIC_STATE_READ; - ret = solo_i2c_handle_read(solo_dev); - break; - } - - solo_dev->i2c_state = IIC_STATE_WRITE; - case IIC_STATE_WRITE: - ret = solo_i2c_handle_write(solo_dev); - break; - - case IIC_STATE_READ: - solo_dev->i2c_msg->buf[solo_dev->i2c_msg_ptr] = - solo_reg_read(solo_dev, SOLO_IIC_RXD); - solo_dev->i2c_msg_ptr++; - - ret = solo_i2c_handle_read(solo_dev); - break; - - default: - solo_i2c_stop(solo_dev); - } - - return ret; -} - -static int solo_i2c_master_xfer(struct i2c_adapter *adap, - struct i2c_msg msgs[], int num) -{ - struct solo_dev *solo_dev = adap->algo_data; - unsigned long timeout; - int ret; - int i; - DEFINE_WAIT(wait); - - for (i = 0; i < SOLO_I2C_ADAPTERS; i++) { - if (&solo_dev->i2c_adap[i] == adap) - break; - } - - if (i == SOLO_I2C_ADAPTERS) - return num; /* XXX Right return value for failure? */ - - mutex_lock(&solo_dev->i2c_mutex); - solo_dev->i2c_id = i; - solo_dev->i2c_msg = msgs; - solo_dev->i2c_msg_num = num; - solo_dev->i2c_msg_ptr = 0; - - solo_reg_write(solo_dev, SOLO_IIC_CTRL, 0); - solo_irq_on(solo_dev, SOLO_IRQ_IIC); - solo_i2c_start(solo_dev); - - timeout = HZ / 2; - - for (;;) { - prepare_to_wait(&solo_dev->i2c_wait, &wait, - TASK_INTERRUPTIBLE); - - if (solo_dev->i2c_state == IIC_STATE_STOP) - break; - - timeout = schedule_timeout(timeout); - if (!timeout) - break; - - if (signal_pending(current)) - break; - } - - finish_wait(&solo_dev->i2c_wait, &wait); - ret = num - solo_dev->i2c_msg_num; - solo_dev->i2c_state = IIC_STATE_IDLE; - solo_dev->i2c_id = -1; - - mutex_unlock(&solo_dev->i2c_mutex); - - return ret; -} - -static u32 solo_i2c_functionality(struct i2c_adapter *adap) -{ - return I2C_FUNC_I2C; -} - -static const struct i2c_algorithm solo_i2c_algo = { - .master_xfer = solo_i2c_master_xfer, - .functionality = solo_i2c_functionality, -}; - -int solo_i2c_init(struct solo_dev *solo_dev) -{ - int i; - int ret; - - solo_reg_write(solo_dev, SOLO_IIC_CFG, - SOLO_IIC_PRESCALE(8) | SOLO_IIC_ENABLE); - - solo_dev->i2c_id = -1; - solo_dev->i2c_state = IIC_STATE_IDLE; - init_waitqueue_head(&solo_dev->i2c_wait); - mutex_init(&solo_dev->i2c_mutex); - - for (i = 0; i < SOLO_I2C_ADAPTERS; i++) { - struct i2c_adapter *adap = &solo_dev->i2c_adap[i]; - - snprintf(adap->name, I2C_NAME_SIZE, "%s I2C %d", - SOLO6X10_NAME, i); - adap->algo = &solo_i2c_algo; - adap->algo_data = solo_dev; - adap->retries = 1; - adap->dev.parent = &solo_dev->pdev->dev; - - ret = i2c_add_adapter(adap); - if (ret) { - adap->algo_data = NULL; - break; - } - } - - if (ret) { - for (i = 0; i < SOLO_I2C_ADAPTERS; i++) { - if (!solo_dev->i2c_adap[i].algo_data) - break; - i2c_del_adapter(&solo_dev->i2c_adap[i]); - solo_dev->i2c_adap[i].algo_data = NULL; - } - return ret; - } - - return 0; -} - -void solo_i2c_exit(struct solo_dev *solo_dev) -{ - int i; - - for (i = 0; i < SOLO_I2C_ADAPTERS; i++) { - if (!solo_dev->i2c_adap[i].algo_data) - continue; - i2c_del_adapter(&solo_dev->i2c_adap[i]); - solo_dev->i2c_adap[i].algo_data = NULL; - } -} |