SPI: Add support for TSC2301 protocol driver

This adds a driver for TSC2301 including support for audio, keypad and
touchscreen. Patch is originally developed for Nokia N800 by Imre Deak,
Jarkko Nikula, Jarkko Oikarinen and Juha Yrjola.
Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>

drivers/spi/Kconfig

@@ -198,6 +198,28 @@ config SPI_TSC2102
          Say Y here if you want support for the TSC2102 chip.  It
 	 will be needed for the touchscreen driver on some boards.
 	 
+config SPI_TSC2301
+	tristate "TSC2301 driver"
+	depends on SPI_MASTER
+	help
+	  Say Y here if you have a TSC2301 chip connected to an SPI
+	  bus on your board.
+
+	  The TSC2301 is a highly integrated PDA analog interface circuit.
+	  It contains a complete 12-bit A/D resistive touch screen
+	  converter (ADC) including drivers, touch pressure measurement
+	  capability, keypad controller, and 8-bit D/A converter (DAC) output
+	  for LCD contrast control.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called tsc2301.
+
+config SPI_TSC2301_AUDIO
+	boolean "TSC2301 audio support"
+	depends on SPI_TSC2301 && SND
+	help
+	  Say Y here for if you are using the audio features of TSC2301.
+
 config SPI_SPIDEV
 	tristate "User mode SPI device driver support"
 	depends on SPI_MASTER && EXPERIMENTAL

drivers/spi/Makefile

@@ -31,6 +31,9 @@ obj-$(CONFIG_SPI_AT25)		+= at25.o
 obj-$(CONFIG_SPI_SPIDEV)	+= spidev.o
 obj-$(CONFIG_SPI_TSC2101)	+= tsc2101.o
 obj-$(CONFIG_SPI_TSC2102)	+= tsc2102.o
+obj-$(CONFIG_SPI_TSC2301)	+= tsc2301.o
+tsc2301-objs			:= tsc2301-core.o
+tsc2301-$(CONFIG_SPI_TSC2301_AUDIO)	+= tsc2301-mixer.o
 # 	... add above this line ...
 
 # SPI slave controller drivers (upstream link)

drivers/spi/tsc2301-core.c

+/*
+ * TSC2301 driver
+ *
+ * Copyright (C) 2005, 2006 Nokia Corporation
+ *
+ * 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 <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/tsc2301.h>
+
+#ifdef CONFIG_ARCH_OMAP
+#include <asm/arch/gpio.h>
+#endif
+
+u16 tsc2301_read_reg(struct tsc2301 *tsc, int reg)
+{
+	struct spi_transfer t[2];
+	struct spi_message m;
+	u16 data = 0, cmd;
+
+	cmd = reg;
+	cmd |= 0x8000;
+
+	memset(t, 0, sizeof(t));
+	spi_message_init(&m);
+	m.spi = tsc->spi;
+
+	t[0].tx_buf = &cmd;
+	t[0].rx_buf = NULL;
+	t[0].len = 2;
+	spi_message_add_tail(&t[0], &m);
+
+	t[1].tx_buf = NULL;
+	t[1].rx_buf = &data;
+	t[1].len = 2;
+	spi_message_add_tail(&t[1], &m);
+
+	spi_sync(m.spi, &m);
+
+	return data;
+}
+
+void tsc2301_write_reg(struct tsc2301 *tsc, int reg, u16 val)
+{
+	struct spi_transfer t;
+	struct spi_message m;
+	u16 data[2];
+
+	/* Now we prepare the command for transferring */
+	data[0] = reg;
+	data[1] = val;
+
+	spi_message_init(&m);
+	m.spi = tsc->spi;
+
+	memset(&t, 0, sizeof(t));
+	t.tx_buf = data;
+	t.rx_buf = NULL;
+	t.len = 4;
+	spi_message_add_tail(&t, &m);
+
+	spi_sync(m.spi, &m);
+}
+
+void tsc2301_write_kbc(struct tsc2301 *tsc, int val)
+{
+	u16 w;
+
+	w = tsc->config2_shadow;
+	w &= ~(0x03 << 14);
+	w |= (val & 0x03) << 14;
+	tsc2301_write_reg(tsc, TSC2301_REG_CONFIG2, w);
+	tsc->config2_shadow = w;
+}
+
+void tsc2301_write_pll(struct tsc2301 *tsc,
+		       int pll_n, int pll_a, int pll_pdc, int pct_e, int pll_o)
+{
+	u16 w;
+
+	w = tsc->config2_shadow;
+	w &= ~0x3fff;
+	w |= (pll_n & 0x0f) | ((pll_a & 0x0f) << 4) | ((pll_pdc & 0x0f) << 8);
+	w |= pct_e ? (1 << 12) : 0;
+	w |= pll_o ? (1 << 13) : 0;
+	tsc2301_write_reg(tsc, TSC2301_REG_CONFIG2, w);
+	tsc->config2_shadow = w;
+}
+
+void tsc2301_read_buf(struct tsc2301 *tsc, int reg, u16 *rx_buf, int len)
+{
+	struct spi_transfer t[2];
+	struct spi_message m;
+	u16 cmd, i;
+
+	cmd = reg;
+	cmd |= 0x8000;
+
+	spi_message_init(&m);
+	m.spi = tsc->spi;
+
+	memset(t, 0, sizeof(t));
+	t[0].tx_buf = &cmd;
+	t[0].rx_buf = NULL;
+	t[0].len = 2;
+	spi_message_add_tail(&t[0], &m);
+
+	t[1].tx_buf = NULL;
+	t[1].rx_buf = rx_buf;
+	t[1].len = 2 * len;
+	spi_message_add_tail(&t[1], &m);
+
+	spi_sync(m.spi, &m);
+
+	for (i = 0; i < len; i++)
+		printk(KERN_DEBUG "rx_buf[%d]: %04x\n", i, rx_buf[i]);
+}
+
+static int __devinit tsc2301_probe(struct spi_device *spi)
+{
+	struct tsc2301			*tsc;
+	struct tsc2301_platform_data	*pdata = spi->dev.platform_data;
+	int r;
+	u16 w;
+
+	if (!pdata) {
+		dev_dbg(&spi->dev, "no platform data?\n");
+		return -ENODEV;
+	}
+
+	tsc = kzalloc(sizeof(*tsc), GFP_KERNEL);
+	if (tsc == NULL)
+		return -ENOMEM;
+
+	dev_set_drvdata(&spi->dev, tsc);
+	tsc->spi = spi;
+	spi->dev.power.power_state = PMSG_ON;
+
+	tsc->enable_clock = pdata->enable_clock;
+	tsc->disable_clock = pdata->disable_clock;
+
+	if (pdata->reset_gpio >= 0) {
+		tsc->reset_gpio = pdata->reset_gpio;
+#ifdef CONFIG_ARCH_OMAP
+		r = omap_request_gpio(tsc->reset_gpio);
+		if (r < 0)
+			goto err1;
+		omap_set_gpio_dataout(tsc->reset_gpio, 1);
+		omap_set_gpio_direction(tsc->reset_gpio, 0);
+		mdelay(1);
+		omap_set_gpio_dataout(tsc->reset_gpio, 0);
+#endif
+	} else
+		tsc->reset_gpio = -1;
+
+	spi->mode = SPI_MODE_0;
+	spi->bits_per_word = 16;
+	/* The max speed might've been defined by the board-specific
+	 * struct */
+	if (!spi->max_speed_hz)
+		spi->max_speed_hz = TSC2301_HZ;
+	spi_setup(spi);
+
+	/* Soft reset */
+	tsc2301_write_reg(tsc, TSC2301_REG_RESET, 0xbb00);
+	msleep(1);
+
+	w = tsc2301_read_reg(tsc, TSC2301_REG_ADC);
+	if (!(w & (1 << 14))) {
+		dev_err(&spi->dev, "invalid ADC reg value: %04x\n", w);
+		r = -ENODEV;
+		goto err1;
+	}
+
+	w = tsc2301_read_reg(tsc, TSC2301_REG_DAC);
+	if (!(w & (1 << 15))) {
+		dev_err(&spi->dev, "invalid DAC reg value: %04x\n", w);
+		r = -ENODEV;
+		goto err1;
+	}
+
+	/* Stop keypad scanning */
+	tsc2301_write_reg(tsc, TSC2301_REG_KEY, 0x4000);
+
+	/* We have to cache this for read-modify-write, since we can't
+	 * read back BIT15 */
+	w = tsc2301_read_reg(tsc, TSC2301_REG_CONFIG2);
+	/* By default BIT15 is set */
+	w |= 1 << 15;
+	tsc->config2_shadow = w;
+
+	r = tsc2301_kp_init(tsc, pdata);
+	if (r)
+		goto err1;
+	r = tsc2301_ts_init(tsc, pdata);
+	if (r)
+		goto err2;
+	r = tsc2301_mixer_init(tsc, pdata);
+	if (r)
+		goto err3;
+	return 0;
+
+err3:
+	tsc2301_ts_exit(tsc);
+err2:
+	tsc2301_kp_exit(tsc);
+err1:
+	kfree(tsc);
+	return r;
+}
+
+static int __devexit tsc2301_remove(struct spi_device *spi)
+{
+	struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
+
+	tsc2301_mixer_exit(tsc);
+        tsc2301_ts_exit(tsc);
+        tsc2301_kp_exit(tsc);
+	kfree(tsc);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int tsc2301_suspend(struct spi_device *spi, pm_message_t mesg)
+{
+	struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
+	int r;
+
+	if ((r = tsc2301_mixer_suspend(tsc)) < 0)
+		return r;
+	if ((r = tsc2301_kp_suspend(tsc)) < 0)
+		goto err1;
+	if ((r = tsc2301_ts_suspend(tsc)) < 0)
+		goto err2;
+
+	return 0;
+err2:
+	tsc2301_kp_resume(tsc);
+err1:
+	tsc2301_mixer_resume(tsc);
+	return r;
+}
+
+static int tsc2301_resume(struct spi_device *spi)
+{
+	struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
+
+	tsc2301_ts_resume(tsc);
+	tsc2301_kp_resume(tsc);
+	tsc2301_mixer_resume(tsc);
+	return 0;
+}
+#endif
+
+static struct spi_driver tsc2301_driver = {
+	.driver = {
+		   .name = "tsc2301",
+		   .bus = &spi_bus_type,
+		   .owner = THIS_MODULE,
+	},
+#ifdef CONFIG_PM
+	.suspend = tsc2301_suspend,
+	.resume = tsc2301_resume,
+#endif
+	.probe = tsc2301_probe,
+	.remove = __devexit_p(tsc2301_remove),
+};
+
+static int __init tsc2301_init(void)
+{
+	printk("TSC2301 driver initializing\n");
+
+	return spi_register_driver(&tsc2301_driver);
+}
+module_init(tsc2301_init);
+
+static void __exit tsc2301_exit(void)
+{
+	spi_unregister_driver(&tsc2301_driver);
+}
+module_exit(tsc2301_exit);
+
+MODULE_AUTHOR("Juha Yrjl <juha.yrjola@nokia.com>");
+MODULE_LICENSE("GPL");

include/linux/spi/tsc2301.h

+#ifndef _LINUX_SPI_TSC2301_H
+#define _LINUX_SPI_TSC2301_H
+
+#include <linux/types.h>
+#include <linux/timer.h>
+
+struct tsc2301_platform_data {
+	/*
+	 * Keypad
+	 */
+	s16	reset_gpio;
+	s16	keyb_int;
+	s16	keymap[16];	/* Set a key to a negative value if not used */
+	unsigned kp_rep:1;	/* Enable keypad repeating */
+
+	/*
+	 * Touchscreen
+	 */
+	s16	dav_gpio;
+	s16	pen_int_gpio;
+	u16	ts_x_plate_ohm;
+	u32	ts_stab_time;	/* voltage settling time */
+	u8	ts_hw_avg;	/* HW assiseted averaging. Can be
+				   0, 4, 8, 16 samples per reading */
+	u32	ts_max_pressure;/* Samples with bigger pressure value will
+				   be ignored, since the corresponding X, Y
+				   values are unreliable */
+	u32	ts_touch_pressure;	/* Pressure limit until we report a
+					   touch event. After that we switch
+					   to ts_max_pressure. */
+	unsigned ts_ignore_last : 1;
+
+	/*
+	 * Audio
+	 */
+	unsigned	pll_pdc:4;
+	unsigned	pll_a:4;
+	unsigned	pll_n:4;
+	unsigned	pll_output:1; /* Output PLL on GPIO_0 */
+
+	unsigned	mclk_ratio:2;
+	unsigned	i2s_sample_rate:4;
+	unsigned	i2s_format:2;
+	/* Mask for audio blocks to be powered down */
+	u16		power_down_blocks;
+
+	/* Called after codec has been initialized, can be NULL */
+	int (* codec_init)(struct device *tsc2301_dev);
+	/* Called when codec is being removed, can be NULL */
+	void (* codec_cleanup)(struct device *tsc2301_dev);
+	int	(*enable_clock)(struct device *dev);
+	void	(*disable_clock)(struct device *dev);
+	int	(*get_keyb_irq_state)(struct device *dev);
+
+	const struct tsc2301_mixer_gpio {
+		const char	*name;
+		unsigned	gpio:4;
+		unsigned	inverted:1;
+		unsigned	def_enable:1; /* enable by default */
+		unsigned	deactivate_on_pd:1; /* power-down flag */
+	} *mixer_gpios;
+	int	n_mixer_gpios;
+};
+
+struct tsc2301_kp;
+struct tsc2301_ts;
+struct tsc2301_mixer;
+
+struct tsc2301 {
+	struct spi_device	*spi;
+
+	s16			reset_gpio;
+	u16			config2_shadow;
+
+        struct tsc2301_kp	*kp;
+	struct tsc2301_ts	*ts;
+	struct tsc2301_mixer	*mixer;
+
+	int			(*enable_clock)(struct device *dev);
+	void			(*disable_clock)(struct device *dev);
+};
+
+
+#define TSC2301_HZ	33000000
+
+#define TSC2301_REG(page, addr)  (((page) << 11) | ((addr) << 5))
+#define TSC2301_REG_TO_PAGE(reg) (((reg) >> 11) & 0x03)
+#define TSC2301_REG_TO_ADDR(reg) (((reg) >> 5)  & 0x1f)
+
+#define TSC2301_REG_X		TSC2301_REG(0, 0)
+#define TSC2301_REG_Y		TSC2301_REG(0, 1)
+#define TSC2301_REG_Z1		TSC2301_REG(0, 2)
+#define TSC2301_REG_Z2		TSC2301_REG(0, 3)
+#define TSC2301_REG_KPDATA	TSC2301_REG(0, 4)
+#define TSC2301_REG_ADC		TSC2301_REG(1, 0)
+#define TSC2301_REG_KEY		TSC2301_REG(1, 1)
+#define TSC2301_REG_DAC		TSC2301_REG(1, 2)
+#define TSC2301_REG_REF		TSC2301_REG(1, 3)
+#define TSC2301_REG_RESET	TSC2301_REG(1, 4)
+#define TSC2301_REG_CONFIG	TSC2301_REG(1, 5)
+#define TSC2301_REG_CONFIG2	TSC2301_REG(1, 6)
+#define TSC2301_REG_KPMASK	TSC2301_REG(1, 16)
+#define TSC2301_REG_AUDCNTL	TSC2301_REG(2, 0)
+#define TSC2301_REG_ADCVOL	TSC2301_REG(2, 1)
+#define TSC2301_REG_DACVOL	TSC2301_REG(2, 2)
+#define TSC2301_REG_BPVOL	TSC2301_REG(2, 3)
+#define TSC2301_REG_KEYCTL	TSC2301_REG(2, 4)
+#define TSC2301_REG_PD_MISC	TSC2301_REG(2, 5)
+#define TSC2301_REG_GPIO	TSC2301_REG(2, 6)
+#define TSC2301_REG_ADCLKCFG	TSC2301_REG(2, 27)
+
+#define TSC2301_REG_PD_MISC_APD		(1 << 15)
+#define TSC2301_REG_PD_MISC_AVPD	(1 << 14)
+#define TSC2301_REG_PD_MISC_ABPD	(1 << 13)
+#define TSC2301_REG_PD_MISC_HAPD	(1 << 12)
+#define TSC2301_REG_PD_MISC_MOPD	(1 << 11)
+#define TSC2301_REG_PD_MISC_DAPD	(1 << 10)
+#define TSC2301_REG_PD_MISC_ADPDL	(1 << 9)
+#define TSC2301_REG_PD_MISC_ADPDR	(1 << 8)
+#define TSC2301_REG_PD_MISC_PDSTS	(1 << 7)
+#define TSC2301_REG_PD_MISC_MIBPD	(1 << 6)
+#define TSC2301_REG_PD_MISC_OTSYN	(1 << 2)
+
+/* I2S sample rate */
+#define TSC2301_I2S_SR_48000	0x00
+#define TSC2301_I2S_SR_44100	0x01
+#define TSC2301_I2S_SR_32000	0x02
+#define TSC2301_I2S_SR_24000	0x03
+#define TSC2301_I2S_SR_22050	0x04
+#define TSC2301_I2S_SR_16000	0x05
+#define TSC2301_I2S_SR_12000	0x06
+#define TSC2301_I2S_SR_11050	0x07
+#define TSC2301_I2S_SR_8000	0x08
+
+/* 16-bit, MSB-first. DAC Right-Justified, ADC Left-Justified */
+#define TSC2301_I2S_FORMAT0	0x00
+/* 20-bit, MSB-first. DAC Right-Justified, ADC Left-Justified */
+#define TSC2301_I2S_FORMAT1	0x01
+/* 20-bit, MSB-first. DAC Left-Justified, ADC Left-Justified */
+#define TSC2301_I2S_FORMAT2	0x02
+/* 20-bit, MSB-first */
+#define TSC2301_I2S_FORMAT3	0x03
+
+/* Master Clock Ratio */
+#define TSC2301_MCLK_256xFS	0x00 /* default */
+#define TSC2301_MCLK_384xFS	0x01
+#define TSC2301_MCLK_512xFS	0x02
+
+
+extern u16 tsc2301_read_reg(struct tsc2301 *tsc, int reg);
+extern void tsc2301_write_reg(struct tsc2301 *tsc, int reg, u16 val);
+extern void tsc2301_write_kbc(struct tsc2301 *tsc, int val);
+extern void tsc2301_write_pll(struct tsc2301 *tsc, int pll_n, int pll_a,
+			      int pll_pdc, int pct_e, int pll_o);
+extern void tsc2301_read_buf(struct tsc2301 *tsc, int reg, u16 *buf, int len);
+
+#define TSC2301_DECL_MOD(module)					\
+extern int  tsc2301_##module##_init(struct tsc2301 *tsc,		\
+			   struct tsc2301_platform_data *pdata);	\
+extern void tsc2301_##module##_exit(struct tsc2301 *tsc);		\
+extern int  tsc2301_##module##_suspend(struct tsc2301 *tsc);		\
+extern void tsc2301_##module##_resume(struct tsc2301 *tsc);
+
+#define TSC2301_DECL_EMPTY_MOD(module)					\
+static inline int tsc2301_##module##_init(struct tsc2301 *tsc,		\
+			   struct tsc2301_platform_data *pdata)		\
+{									\
+	return 0;							\
+}									\
+static inline void tsc2301_##module##_exit(struct tsc2301 *tsc) {}	\
+static inline int  tsc2301_##module##_suspend(struct tsc2301 *tsc)	\
+{									\
+	return 0;							\
+}									\
+static inline void tsc2301_##module##_resume(struct tsc2301 *tsc) {}
+
+#ifdef CONFIG_KEYBOARD_TSC2301
+TSC2301_DECL_MOD(kp)
+void tsc2301_kp_restart(struct tsc2301 *tsc);
+#else
+TSC2301_DECL_EMPTY_MOD(kp)
+static inline void tsc2301_kp_restart(struct tsc2301 *tsc) {}
+#endif
+
+#ifdef CONFIG_TOUCHSCREEN_TSC2301
+TSC2301_DECL_MOD(ts)
+#else
+TSC2301_DECL_EMPTY_MOD(ts)
+#endif
+
+#ifdef CONFIG_SPI_TSC2301_AUDIO
+TSC2301_DECL_MOD(mixer)
+extern void tsc2301_mixer_set_power(struct device *tsc_dev, int dac, int adc);
+
+struct snd_card;
+extern int tsc2301_mixer_register_controls(struct device *tsc_dev,
+					   struct snd_card *card);
+#else
+TSC2301_DECL_EMPTY_MOD(mixer)
+#endif
+
+extern void tsc2301_mixer_enable_mclk(struct device *tsc_dev);
+extern void tsc2301_mixer_disable_mclk(struct device *tsc_dev);
+
+#endif