mfd: si476x: Add the bulk of the core driver
This patch adds main part(out of three) of the I2C driver for the "core" of MFD device. Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Andrey Smirnov
Samuel Ortiz
parent
ed4a8fe892
commit
730a30ab7f
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@ -0,0 +1,886 @@
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/*
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* drivers/mfd/si476x-i2c.c -- Core device driver for si476x MFD
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* device
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*
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* Copyright (C) 2012 Innovative Converged Devices(ICD)
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* Copyright (C) 2013 Andrey Smirnov
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*
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* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/regulator/consumer.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/mfd/si476x-core.h>
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#define SI476X_MAX_IO_ERRORS 10
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#define SI476X_DRIVER_RDS_FIFO_DEPTH 128
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/**
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* si476x_core_config_pinmux() - pin function configuration function
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*
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* @core: Core device structure
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*
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* Configure the functions of the pins of the radio chip.
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*
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* The function returns zero in case of succes or negative error code
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* otherwise.
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*/
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static int si476x_core_config_pinmux(struct si476x_core *core)
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{
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int err;
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dev_dbg(&core->client->dev, "Configuring pinmux\n");
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err = si476x_core_cmd_dig_audio_pin_cfg(core,
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core->pinmux.dclk,
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core->pinmux.dfs,
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core->pinmux.dout,
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core->pinmux.xout);
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if (err < 0) {
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dev_err(&core->client->dev,
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"Failed to configure digital audio pins(err = %d)\n",
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err);
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return err;
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}
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err = si476x_core_cmd_zif_pin_cfg(core,
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core->pinmux.iqclk,
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core->pinmux.iqfs,
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core->pinmux.iout,
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core->pinmux.qout);
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if (err < 0) {
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dev_err(&core->client->dev,
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"Failed to configure ZIF pins(err = %d)\n",
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err);
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return err;
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}
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err = si476x_core_cmd_ic_link_gpo_ctl_pin_cfg(core,
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core->pinmux.icin,
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core->pinmux.icip,
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core->pinmux.icon,
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core->pinmux.icop);
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if (err < 0) {
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dev_err(&core->client->dev,
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"Failed to configure IC-Link/GPO pins(err = %d)\n",
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err);
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return err;
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}
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err = si476x_core_cmd_ana_audio_pin_cfg(core,
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core->pinmux.lrout);
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if (err < 0) {
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dev_err(&core->client->dev,
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"Failed to configure analog audio pins(err = %d)\n",
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err);
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return err;
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}
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err = si476x_core_cmd_intb_pin_cfg(core,
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core->pinmux.intb,
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core->pinmux.a1);
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if (err < 0) {
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dev_err(&core->client->dev,
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"Failed to configure interrupt pins(err = %d)\n",
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err);
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return err;
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}
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return 0;
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}
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static inline void si476x_core_schedule_polling_work(struct si476x_core *core)
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{
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schedule_delayed_work(&core->status_monitor,
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usecs_to_jiffies(SI476X_STATUS_POLL_US));
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}
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/**
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* si476x_core_start() - early chip startup function
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* @core: Core device structure
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* @soft: When set, this flag forces "soft" startup, where "soft"
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* power down is the one done by sending appropriate command instead
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* of using reset pin of the tuner
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*
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* Perform required startup sequence to correctly power
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* up the chip and perform initial configuration. It does the
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* following sequence of actions:
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* 1. Claims and enables the power supplies VD and VIO1 required
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* for I2C interface of the chip operation.
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* 2. Waits for 100us, pulls the reset line up, enables irq,
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* waits for another 100us as it is specified by the
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* datasheet.
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* 3. Sends 'POWER_UP' command to the device with all provided
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* information about power-up parameters.
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* 4. Configures, pin multiplexor, disables digital audio and
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* configures interrupt sources.
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*
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* The function returns zero in case of succes or negative error code
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* otherwise.
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*/
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int si476x_core_start(struct si476x_core *core, bool soft)
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{
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struct i2c_client *client = core->client;
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int err;
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if (!soft) {
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if (gpio_is_valid(core->gpio_reset))
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gpio_set_value_cansleep(core->gpio_reset, 1);
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if (client->irq)
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enable_irq(client->irq);
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udelay(100);
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if (!client->irq) {
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atomic_set(&core->is_alive, 1);
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si476x_core_schedule_polling_work(core);
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}
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} else {
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if (client->irq)
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enable_irq(client->irq);
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else {
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atomic_set(&core->is_alive, 1);
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si476x_core_schedule_polling_work(core);
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}
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}
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err = si476x_core_cmd_power_up(core,
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&core->power_up_parameters);
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if (err < 0) {
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dev_err(&core->client->dev,
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"Power up failure(err = %d)\n",
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err);
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goto disable_irq;
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}
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if (client->irq)
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atomic_set(&core->is_alive, 1);
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err = si476x_core_config_pinmux(core);
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if (err < 0) {
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dev_err(&core->client->dev,
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"Failed to configure pinmux(err = %d)\n",
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err);
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goto disable_irq;
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}
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if (client->irq) {
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err = regmap_write(core->regmap,
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SI476X_PROP_INT_CTL_ENABLE,
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SI476X_RDSIEN |
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SI476X_STCIEN |
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SI476X_CTSIEN);
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if (err < 0) {
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dev_err(&core->client->dev,
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"Failed to configure interrupt sources"
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"(err = %d)\n", err);
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goto disable_irq;
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}
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}
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return 0;
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disable_irq:
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if (err == -ENODEV)
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atomic_set(&core->is_alive, 0);
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if (client->irq)
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disable_irq(client->irq);
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else
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cancel_delayed_work_sync(&core->status_monitor);
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if (gpio_is_valid(core->gpio_reset))
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gpio_set_value_cansleep(core->gpio_reset, 0);
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return err;
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}
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EXPORT_SYMBOL_GPL(si476x_core_start);
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/**
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* si476x_core_stop() - chip power-down function
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* @core: Core device structure
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* @soft: When set, function sends a POWER_DOWN command instead of
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* bringing reset line low
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*
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* Power down the chip by performing following actions:
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* 1. Disable IRQ or stop the polling worker
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* 2. Send the POWER_DOWN command if the power down is soft or bring
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* reset line low if not.
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*
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* The function returns zero in case of succes or negative error code
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* otherwise.
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*/
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int si476x_core_stop(struct si476x_core *core, bool soft)
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{
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int err = 0;
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atomic_set(&core->is_alive, 0);
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if (soft) {
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/* TODO: This probably shoud be a configurable option,
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* so it is possible to have the chips keep their
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* oscillators running
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*/
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struct si476x_power_down_args args = {
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.xosc = false,
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};
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err = si476x_core_cmd_power_down(core, &args);
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}
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/* We couldn't disable those before
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* 'si476x_core_cmd_power_down' since we expect to get CTS
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* interrupt */
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if (core->client->irq)
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disable_irq(core->client->irq);
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else
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cancel_delayed_work_sync(&core->status_monitor);
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if (!soft) {
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if (gpio_is_valid(core->gpio_reset))
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gpio_set_value_cansleep(core->gpio_reset, 0);
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(si476x_core_stop);
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/**
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* si476x_core_set_power_state() - set the level at which the power is
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* supplied for the chip.
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* @core: Core device structure
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* @next_state: enum si476x_power_state describing power state to
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* switch to.
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*
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* Switch on all the required power supplies
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*
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* This function returns 0 in case of suvccess and negative error code
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* otherwise.
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*/
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int si476x_core_set_power_state(struct si476x_core *core,
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enum si476x_power_state next_state)
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{
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/*
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It is not clear form the datasheet if it is possible to
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work with device if not all power domains are operational.
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So for now the power-up policy is "power-up all the things!"
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*/
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int err = 0;
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if (core->power_state == SI476X_POWER_INCONSISTENT) {
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dev_err(&core->client->dev,
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"The device in inconsistent power state\n");
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return -EINVAL;
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}
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if (next_state != core->power_state) {
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switch (next_state) {
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case SI476X_POWER_UP_FULL:
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err = regulator_bulk_enable(ARRAY_SIZE(core->supplies),
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core->supplies);
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if (err < 0) {
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core->power_state = SI476X_POWER_INCONSISTENT;
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break;
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}
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/*
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* Startup timing diagram recommends to have a
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* 100 us delay between enabling of the power
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* supplies and turning the tuner on.
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*/
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udelay(100);
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err = si476x_core_start(core, false);
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if (err < 0)
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goto disable_regulators;
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core->power_state = next_state;
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break;
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case SI476X_POWER_DOWN:
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core->power_state = next_state;
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err = si476x_core_stop(core, false);
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if (err < 0)
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core->power_state = SI476X_POWER_INCONSISTENT;
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disable_regulators:
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err = regulator_bulk_disable(ARRAY_SIZE(core->supplies),
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core->supplies);
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if (err < 0)
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core->power_state = SI476X_POWER_INCONSISTENT;
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break;
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default:
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BUG();
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}
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(si476x_core_set_power_state);
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/**
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* si476x_core_report_drainer_stop() - mark the completion of the RDS
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* buffer drain porcess by the worker.
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*
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* @core: Core device structure
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*/
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static inline void si476x_core_report_drainer_stop(struct si476x_core *core)
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{
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mutex_lock(&core->rds_drainer_status_lock);
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core->rds_drainer_is_working = false;
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mutex_unlock(&core->rds_drainer_status_lock);
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}
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/**
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* si476x_core_start_rds_drainer_once() - start RDS drainer worker if
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* ther is none working, do nothing otherwise
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*
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* @core: Datastructure corresponding to the chip.
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*/
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static inline void si476x_core_start_rds_drainer_once(struct si476x_core *core)
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{
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mutex_lock(&core->rds_drainer_status_lock);
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if (!core->rds_drainer_is_working) {
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core->rds_drainer_is_working = true;
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schedule_work(&core->rds_fifo_drainer);
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}
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mutex_unlock(&core->rds_drainer_status_lock);
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}
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/**
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* si476x_drain_rds_fifo() - RDS buffer drainer.
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* @work: struct work_struct being ppassed to the function by the
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* kernel.
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*
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* Drain the contents of the RDS FIFO of
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*/
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static void si476x_core_drain_rds_fifo(struct work_struct *work)
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{
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int err;
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struct si476x_core *core = container_of(work, struct si476x_core,
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rds_fifo_drainer);
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struct si476x_rds_status_report report;
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si476x_core_lock(core);
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err = si476x_core_cmd_fm_rds_status(core, true, false, false, &report);
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if (!err) {
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int i = report.rdsfifoused;
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dev_dbg(&core->client->dev,
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"%d elements in RDS FIFO. Draining.\n", i);
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for (; i > 0; --i) {
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err = si476x_core_cmd_fm_rds_status(core, false, false,
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(i == 1), &report);
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if (err < 0)
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goto unlock;
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kfifo_in(&core->rds_fifo, report.rds,
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sizeof(report.rds));
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dev_dbg(&core->client->dev, "RDS data:\n %*ph\n",
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sizeof(report.rds), report.rds);
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}
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dev_dbg(&core->client->dev, "Drrrrained!\n");
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wake_up_interruptible(&core->rds_read_queue);
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}
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unlock:
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si476x_core_unlock(core);
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si476x_core_report_drainer_stop(core);
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}
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/**
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* si476x_core_pronounce_dead()
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*
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* @core: Core device structure
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*
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* Mark the device as being dead and wake up all potentially waiting
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* threads of execution.
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*
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*/
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static void si476x_core_pronounce_dead(struct si476x_core *core)
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{
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dev_info(&core->client->dev, "Core device is dead.\n");
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atomic_set(&core->is_alive, 0);
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/* Wake up al possible waiting processes */
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wake_up_interruptible(&core->rds_read_queue);
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atomic_set(&core->cts, 1);
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wake_up(&core->command);
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atomic_set(&core->stc, 1);
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wake_up(&core->tuning);
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}
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/**
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* si476x_core_i2c_xfer()
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*
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* @core: Core device structure
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* @type: Transfer type
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* @buf: Transfer buffer for/with data
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* @count: Transfer buffer size
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*
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* Perfrom and I2C transfer(either read or write) and keep a counter
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* of I/O errors. If the error counter rises above the threshold
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* pronounce device dead.
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*
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* The function returns zero on succes or negative error code on
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* failure.
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*/
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int si476x_core_i2c_xfer(struct si476x_core *core,
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enum si476x_i2c_type type,
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char *buf, int count)
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{
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static int io_errors_count;
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int err;
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if (type == SI476X_I2C_SEND)
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err = i2c_master_send(core->client, buf, count);
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else
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err = i2c_master_recv(core->client, buf, count);
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if (err < 0) {
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if (io_errors_count++ > SI476X_MAX_IO_ERRORS)
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si476x_core_pronounce_dead(core);
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} else {
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io_errors_count = 0;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(si476x_core_i2c_xfer);
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/**
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* si476x_get_status()
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* @core: Core device structure
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*
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* Get the status byte of the core device by berforming one byte I2C
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* read.
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*
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* The function returns a status value or a negative error code on
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* error.
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*/
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static int si476x_core_get_status(struct si476x_core *core)
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{
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u8 response;
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int err = si476x_core_i2c_xfer(core, SI476X_I2C_RECV,
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&response, sizeof(response));
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return (err < 0) ? err : response;
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}
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/**
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* si476x_get_and_signal_status() - IRQ dispatcher
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* @core: Core device structure
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||||
*
|
||||
* Dispatch the arrived interrupt request based on the value of the
|
||||
* status byte reported by the tuner.
|
||||
*
|
||||
*/
|
||||
static void si476x_core_get_and_signal_status(struct si476x_core *core)
|
||||
{
|
||||
int status = si476x_core_get_status(core);
|
||||
if (status < 0) {
|
||||
dev_err(&core->client->dev, "Failed to get status\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (status & SI476X_CTS) {
|
||||
/* Unfortunately completions could not be used for
|
||||
* signalling CTS since this flag cannot be cleared
|
||||
* in status byte, and therefore once it becomes true
|
||||
* multiple calls to 'complete' would cause the
|
||||
* commands following the current one to be completed
|
||||
* before they actually are */
|
||||
dev_dbg(&core->client->dev, "[interrupt] CTSINT\n");
|
||||
atomic_set(&core->cts, 1);
|
||||
wake_up(&core->command);
|
||||
}
|
||||
|
||||
if (status & SI476X_FM_RDS_INT) {
|
||||
dev_dbg(&core->client->dev, "[interrupt] RDSINT\n");
|
||||
si476x_core_start_rds_drainer_once(core);
|
||||
}
|
||||
|
||||
if (status & SI476X_STC_INT) {
|
||||
dev_dbg(&core->client->dev, "[interrupt] STCINT\n");
|
||||
atomic_set(&core->stc, 1);
|
||||
wake_up(&core->tuning);
|
||||
}
|
||||
}
|
||||
|
||||
static void si476x_core_poll_loop(struct work_struct *work)
|
||||
{
|
||||
struct si476x_core *core = SI476X_WORK_TO_CORE(work);
|
||||
|
||||
si476x_core_get_and_signal_status(core);
|
||||
|
||||
if (atomic_read(&core->is_alive))
|
||||
si476x_core_schedule_polling_work(core);
|
||||
}
|
||||
|
||||
static irqreturn_t si476x_core_interrupt(int irq, void *dev)
|
||||
{
|
||||
struct si476x_core *core = dev;
|
||||
|
||||
si476x_core_get_and_signal_status(core);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
/**
|
||||
* si476x_firmware_version_to_revision()
|
||||
* @core: Core device structure
|
||||
* @major: Firmware major number
|
||||
* @minor1: Firmware first minor number
|
||||
* @minor2: Firmware second minor number
|
||||
*
|
||||
* Convert a chip's firmware version number into an offset that later
|
||||
* will be used to as offset in "vtable" of tuner functions
|
||||
*
|
||||
* This function returns a positive offset in case of success and a -1
|
||||
* in case of failure.
|
||||
*/
|
||||
static int si476x_core_fwver_to_revision(struct si476x_core *core,
|
||||
int func, int major,
|
||||
int minor1, int minor2)
|
||||
{
|
||||
switch (func) {
|
||||
case SI476X_FUNC_FM_RECEIVER:
|
||||
switch (major) {
|
||||
case 5:
|
||||
return SI476X_REVISION_A10;
|
||||
case 8:
|
||||
return SI476X_REVISION_A20;
|
||||
case 10:
|
||||
return SI476X_REVISION_A30;
|
||||
default:
|
||||
goto unknown_revision;
|
||||
}
|
||||
case SI476X_FUNC_AM_RECEIVER:
|
||||
switch (major) {
|
||||
case 5:
|
||||
return SI476X_REVISION_A10;
|
||||
case 7:
|
||||
return SI476X_REVISION_A20;
|
||||
case 9:
|
||||
return SI476X_REVISION_A30;
|
||||
default:
|
||||
goto unknown_revision;
|
||||
}
|
||||
case SI476X_FUNC_WB_RECEIVER:
|
||||
switch (major) {
|
||||
case 3:
|
||||
return SI476X_REVISION_A10;
|
||||
case 5:
|
||||
return SI476X_REVISION_A20;
|
||||
case 7:
|
||||
return SI476X_REVISION_A30;
|
||||
default:
|
||||
goto unknown_revision;
|
||||
}
|
||||
case SI476X_FUNC_BOOTLOADER:
|
||||
default: /* FALLTHROUG */
|
||||
BUG();
|
||||
return -1;
|
||||
}
|
||||
|
||||
unknown_revision:
|
||||
dev_err(&core->client->dev,
|
||||
"Unsupported version of the firmware: %d.%d.%d, "
|
||||
"reverting to A10 comptible functions\n",
|
||||
major, minor1, minor2);
|
||||
|
||||
return SI476X_REVISION_A10;
|
||||
}
|
||||
|
||||
/**
|
||||
* si476x_get_revision_info()
|
||||
* @core: Core device structure
|
||||
*
|
||||
* Get the firmware version number of the device. It is done in
|
||||
* following three steps:
|
||||
* 1. Power-up the device
|
||||
* 2. Send the 'FUNC_INFO' command
|
||||
* 3. Powering the device down.
|
||||
*
|
||||
* The function return zero on success and a negative error code on
|
||||
* failure.
|
||||
*/
|
||||
static int si476x_core_get_revision_info(struct si476x_core *core)
|
||||
{
|
||||
int rval;
|
||||
struct si476x_func_info info;
|
||||
|
||||
si476x_core_lock(core);
|
||||
rval = si476x_core_set_power_state(core, SI476X_POWER_UP_FULL);
|
||||
if (rval < 0)
|
||||
goto exit;
|
||||
|
||||
rval = si476x_core_cmd_func_info(core, &info);
|
||||
if (rval < 0)
|
||||
goto power_down;
|
||||
|
||||
core->revision = si476x_core_fwver_to_revision(core, info.func,
|
||||
info.firmware.major,
|
||||
info.firmware.minor[0],
|
||||
info.firmware.minor[1]);
|
||||
power_down:
|
||||
si476x_core_set_power_state(core, SI476X_POWER_DOWN);
|
||||
exit:
|
||||
si476x_core_unlock(core);
|
||||
|
||||
return rval;
|
||||
}
|
||||
|
||||
bool si476x_core_has_am(struct si476x_core *core)
|
||||
{
|
||||
return core->chip_id == SI476X_CHIP_SI4761 ||
|
||||
core->chip_id == SI476X_CHIP_SI4764;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(si476x_core_has_am);
|
||||
|
||||
bool si476x_core_has_diversity(struct si476x_core *core)
|
||||
{
|
||||
return core->chip_id == SI476X_CHIP_SI4764;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(si476x_core_has_diversity);
|
||||
|
||||
bool si476x_core_is_a_secondary_tuner(struct si476x_core *core)
|
||||
{
|
||||
return si476x_core_has_diversity(core) &&
|
||||
(core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
|
||||
core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(si476x_core_is_a_secondary_tuner);
|
||||
|
||||
bool si476x_core_is_a_primary_tuner(struct si476x_core *core)
|
||||
{
|
||||
return si476x_core_has_diversity(core) &&
|
||||
(core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
|
||||
core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(si476x_core_is_a_primary_tuner);
|
||||
|
||||
bool si476x_core_is_in_am_receiver_mode(struct si476x_core *core)
|
||||
{
|
||||
return si476x_core_has_am(core) &&
|
||||
(core->power_up_parameters.func == SI476X_FUNC_AM_RECEIVER);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(si476x_core_is_in_am_receiver_mode);
|
||||
|
||||
bool si476x_core_is_powered_up(struct si476x_core *core)
|
||||
{
|
||||
return core->power_state == SI476X_POWER_UP_FULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(si476x_core_is_powered_up);
|
||||
|
||||
static int si476x_core_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
int rval;
|
||||
struct si476x_core *core;
|
||||
struct si476x_platform_data *pdata;
|
||||
struct mfd_cell *cell;
|
||||
int cell_num;
|
||||
|
||||
core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
|
||||
if (!core) {
|
||||
dev_err(&client->dev,
|
||||
"failed to allocate 'struct si476x_core'\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
core->client = client;
|
||||
|
||||
core->regmap = devm_regmap_init_si476x(core);
|
||||
if (IS_ERR(core->regmap)) {
|
||||
rval = PTR_ERR(core->regmap);
|
||||
dev_err(&client->dev,
|
||||
"Failed to allocate register map: %d\n",
|
||||
rval);
|
||||
return rval;
|
||||
}
|
||||
|
||||
i2c_set_clientdata(client, core);
|
||||
|
||||
atomic_set(&core->is_alive, 0);
|
||||
core->power_state = SI476X_POWER_DOWN;
|
||||
|
||||
pdata = client->dev.platform_data;
|
||||
if (pdata) {
|
||||
memcpy(&core->power_up_parameters,
|
||||
&pdata->power_up_parameters,
|
||||
sizeof(core->power_up_parameters));
|
||||
|
||||
core->gpio_reset = -1;
|
||||
if (gpio_is_valid(pdata->gpio_reset)) {
|
||||
rval = gpio_request(pdata->gpio_reset, "si476x reset");
|
||||
if (rval) {
|
||||
dev_err(&client->dev,
|
||||
"Failed to request gpio: %d\n", rval);
|
||||
return rval;
|
||||
}
|
||||
core->gpio_reset = pdata->gpio_reset;
|
||||
gpio_direction_output(core->gpio_reset, 0);
|
||||
}
|
||||
|
||||
core->diversity_mode = pdata->diversity_mode;
|
||||
memcpy(&core->pinmux, &pdata->pinmux,
|
||||
sizeof(struct si476x_pinmux));
|
||||
} else {
|
||||
dev_err(&client->dev, "No platform data provided\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
core->supplies[0].supply = "vd";
|
||||
core->supplies[1].supply = "va";
|
||||
core->supplies[2].supply = "vio1";
|
||||
core->supplies[3].supply = "vio2";
|
||||
|
||||
rval = devm_regulator_bulk_get(&client->dev,
|
||||
ARRAY_SIZE(core->supplies),
|
||||
core->supplies);
|
||||
if (rval) {
|
||||
dev_err(&client->dev, "Failet to gett all of the regulators\n");
|
||||
goto free_gpio;
|
||||
}
|
||||
|
||||
mutex_init(&core->cmd_lock);
|
||||
init_waitqueue_head(&core->command);
|
||||
init_waitqueue_head(&core->tuning);
|
||||
|
||||
rval = kfifo_alloc(&core->rds_fifo,
|
||||
SI476X_DRIVER_RDS_FIFO_DEPTH *
|
||||
sizeof(struct v4l2_rds_data),
|
||||
GFP_KERNEL);
|
||||
if (rval) {
|
||||
dev_err(&client->dev, "Could not alloate the FIFO\n");
|
||||
goto free_gpio;
|
||||
}
|
||||
mutex_init(&core->rds_drainer_status_lock);
|
||||
init_waitqueue_head(&core->rds_read_queue);
|
||||
INIT_WORK(&core->rds_fifo_drainer, si476x_core_drain_rds_fifo);
|
||||
|
||||
if (client->irq) {
|
||||
rval = devm_request_threaded_irq(&client->dev,
|
||||
client->irq, NULL,
|
||||
si476x_core_interrupt,
|
||||
IRQF_TRIGGER_FALLING,
|
||||
client->name, core);
|
||||
if (rval < 0) {
|
||||
dev_err(&client->dev, "Could not request IRQ %d\n",
|
||||
client->irq);
|
||||
goto free_kfifo;
|
||||
}
|
||||
disable_irq(client->irq);
|
||||
dev_dbg(&client->dev, "IRQ requested.\n");
|
||||
|
||||
core->rds_fifo_depth = 20;
|
||||
} else {
|
||||
INIT_DELAYED_WORK(&core->status_monitor,
|
||||
si476x_core_poll_loop);
|
||||
dev_info(&client->dev,
|
||||
"No IRQ number specified, will use polling\n");
|
||||
|
||||
core->rds_fifo_depth = 5;
|
||||
}
|
||||
|
||||
core->chip_id = id->driver_data;
|
||||
|
||||
rval = si476x_core_get_revision_info(core);
|
||||
if (rval < 0) {
|
||||
rval = -ENODEV;
|
||||
goto free_kfifo;
|
||||
}
|
||||
|
||||
cell_num = 0;
|
||||
|
||||
cell = &core->cells[SI476X_RADIO_CELL];
|
||||
cell->name = "si476x-radio";
|
||||
cell_num++;
|
||||
|
||||
#ifdef CONFIG_SND_SOC_SI476X
|
||||
if ((core->chip_id == SI476X_CHIP_SI4761 ||
|
||||
core->chip_id == SI476X_CHIP_SI4764) &&
|
||||
core->pinmux.dclk == SI476X_DCLK_DAUDIO &&
|
||||
core->pinmux.dfs == SI476X_DFS_DAUDIO &&
|
||||
core->pinmux.dout == SI476X_DOUT_I2S_OUTPUT &&
|
||||
core->pinmux.xout == SI476X_XOUT_TRISTATE) {
|
||||
cell = &core->cells[SI476X_CODEC_CELL];
|
||||
cell->name = "si476x-codec";
|
||||
cell_num++;
|
||||
}
|
||||
#endif
|
||||
rval = mfd_add_devices(&client->dev,
|
||||
(client->adapter->nr << 8) + client->addr,
|
||||
core->cells, cell_num,
|
||||
NULL, 0, NULL);
|
||||
if (!rval)
|
||||
return 0;
|
||||
|
||||
free_kfifo:
|
||||
kfifo_free(&core->rds_fifo);
|
||||
|
||||
free_gpio:
|
||||
if (gpio_is_valid(core->gpio_reset))
|
||||
gpio_free(core->gpio_reset);
|
||||
|
||||
return rval;
|
||||
}
|
||||
|
||||
static int si476x_core_remove(struct i2c_client *client)
|
||||
{
|
||||
struct si476x_core *core = i2c_get_clientdata(client);
|
||||
|
||||
si476x_core_pronounce_dead(core);
|
||||
mfd_remove_devices(&client->dev);
|
||||
|
||||
if (client->irq)
|
||||
disable_irq(client->irq);
|
||||
else
|
||||
cancel_delayed_work_sync(&core->status_monitor);
|
||||
|
||||
kfifo_free(&core->rds_fifo);
|
||||
|
||||
if (gpio_is_valid(core->gpio_reset))
|
||||
gpio_free(core->gpio_reset);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static const struct i2c_device_id si476x_id[] = {
|
||||
{ "si4761", SI476X_CHIP_SI4761 },
|
||||
{ "si4764", SI476X_CHIP_SI4764 },
|
||||
{ "si4768", SI476X_CHIP_SI4768 },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, si476x_id);
|
||||
|
||||
static struct i2c_driver si476x_core_driver = {
|
||||
.driver = {
|
||||
.name = "si476x-core",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = si476x_core_probe,
|
||||
.remove = si476x_core_remove,
|
||||
.id_table = si476x_id,
|
||||
};
|
||||
module_i2c_driver(si476x_core_driver);
|
||||
|
||||
|
||||
MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
|
||||
MODULE_DESCRIPTION("Si4761/64/68 AM/FM MFD core device driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue